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Wyświetlanie 1-15 z 1387
Tytuł:
Extraction, Chemical Composition and Antidiabetic Potential of Crude Polysaccharides from Centella asiatica (L.) Urban
Autorzy:
Li, Meng
Shahid, Muhammad
Zhang, Xiaobin
Law, Douglas
Mackeen, Mukram M.
Teh, Arnida H.
Najm, Ahmad A.
Fazry, Shazrul
Othman, Babul A.
Powiązania:
https://bibliotekanauki.pl/articles/31341117.pdf
Data publikacji:
2024-05-24
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
alcohol insoluble residue
antidiabetic
mineral elements
monosaccharide composition
response surface methodology
Opis:
The global prevalence of diabetes mellitus (DM) is escalating, posing a significant challenge to human healthcare systems. In the present study, mineral and monosaccharide compositions, and antidiabetic potential of polysaccharide fractions separated from Centella asiatica (L.) leaves (CAL) were assessed. Initial single-factor experiments identified key extraction parameters, further optimized through response surface methodology (RSM) with optimal conditions determined as a liquid-to-solid ratio of 24.43:1 (mL/g), extraction time of 60.76 min, and a temperature of 83.31℃. Alcohol insoluble residue (AIR) extraction yielded three crude polysaccharide fractions (P50, P70, and P90). P50 was obtained with the highest yield (14.31%) and exhibited the highest content of total sugars and uronic acids (68.01 and 24.28 g/100 g, respectively). Calcium, magnesium, and manganese were dominant minerals in P50 and P70. Monosaccharide composition analysis via high-performance liquid chromatography (HPLC) demonstrated enrichment of galacturonic acid, galactose, and arabinose in P50 and P70. Furthermore, both fractions (P50 and P70) exhibited dose-dependent inhibitory effects on α-amylase and α-glucosidase. At 5 mg/mL, P50 caused 68.3% α-amylase inhibition and 62.3% α-glucosidase inhibition, while P70 triggered 46.8% and 34.1% inhibition, respectively. In conclusion, this study is the first to provide valuable insights into optimizing CAL extraction conditions. Potential utilization of polysaccharide fractions obtained from CAL as components for formulating functional foods can be explored in the future.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2024, 74, 2; 177-187
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Artificial intelligence versus natural intelligence in mineral processing
Autorzy:
Özkan, Şafak Gökhan
Powiązania:
https://bibliotekanauki.pl/articles/24148604.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
NI
natural intelligence
AI
artificial intelligence
ML
machine learning
DL
deep learning
ES
expert systems
mineral processing
Opis:
This article aims to introduce the terms NI-Natural Intelligence, AI-Artificial Intelligence, ML-Machine Learning, DL-Deep Learning, ES-Expert Systems and etc. used by modern digital world to mining and mineral processing and to show the main differences between them. As well known, each scientific and technological step in mineral industry creates huge amount of raw data and there is a serious necessity to firstly classify them. Afterwards experts should find alternative solutions in order to get optimal results by using those parameters and relations between them using special simulation software platforms. Development of these simulation models for such complex operations is not only time consuming and lacks real time applicability but also requires integration of multiple software platforms, intensive process knowledge and extensive model validation. An example case study is also demonstrated and the results are discussed within the article covering the main inferences, comments and decision during NI use for the experimental parameters used in a flotation related postgraduate study and compares with possible AI use.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 5; art. no. 167501
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of sand recovered from the municipal wastewater treatment plant
Charakterystyka surowców odzyskiwanych z miejskiej oczyszczalni ścieków – piasek z piaskowników
Autorzy:
Górka, Justyna
Poproch, Dominika
Cimochowicz-Rybicka, Małgorzata
Łuszczek, Bartosz
Powiązania:
https://bibliotekanauki.pl/articles/27311667.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
circular economy
grit chamber
sand separator
mineral resources
gospodarka o obiegu zamkniętym
oczyszczalnia ścieków
piasek z piaskowników
Opis:
This article investigates the possibilities of the recovery of raw materials at the Kraków-Płaszów municipal wastewater treatment plant (WWTP). The materials include sand coming with raw sewage and delivered by septic tankers, after cleaning sewage systems. Following the Regulation of the Minister of Climate (January 2020), sand from grit chambers is classified in the waste catalog as waste, with the code of 19 08 02. (Journal of Laws of 2020, item 10). The purchase of very efficient units has optimized the grit chamber operation and minimized the amount of waste generated as well as being an odor nuisance. The paper presents a mass balance for sand collected at the WWTP. Due to the use of new sand separators, the amount of this waste has been reduced by 28%. The paper presents the sieve curves of sand collected at the wastewater treatment plant and during the cleaning of sewage wells, as well as for sand mixtures. The sand mixture was prepared to allow some variations in the grain size characteristics of the sand. The graining differentiation indexes and curvature indexes were calculated. In addition, in laboratory tests, the leachability of heavy metals and the content of dry matter (DM) and dry mineral matter (DMM) were determined. The laboratory tests confirmed the reduction of organic solids to a level below 3% of dry weight; the content of heavy metals remained below the level of detection. The experiments confirmed that sand from the WWTP can be used as fine-grained aggregate in the production of concrete.
W artykule przedstawiono możliwości odzysku surowców z miejskiej oczyszczalni ścieków Kraków-Płaszów. Do surowców tych zalicza się: piasek ze ścieków dopływających miejską siecią kanalizacyjną oraz piasek z czyszczenia sieci kanalizacyjnej dowożony samochodami asenizacyjnymi. Zgodnie z rozporządzeniem Ministra Klimatu ze stycznia 2020 r. w sprawie katalogu odpadów (Dz.U. z 2020 r., poz. 10) piasek z piaskowników klasyfikowany jest jako odpad o kodzie 19 08 02. Zastosowanie wysokosprawnych urządzeń pozwoliło zoptymalizować pracę piaskowników, zminimalizować ilość wytwarzanych odpadów, a także zmniejszyć ich uciążliwość zapachową. W pracy przedstawiono bilans ilościowy piasku pochodzącego z oczyszczalni ścieków. Dzięki zainstalowaniu nowych separatorów zmniejszeniu uległa ilość generowanego piasku o 36%. Przedstawiono krzywe sitowe piasku pochodzącego z oczyszczalni ścieków i z procesu czyszczenia studzienek kanalizacyjnych oraz ich mieszaniny w ustalonych proporcjach. Mieszanie miało na celu zmianę charakterystyki uziarnienia piasku. Obliczono wskaźniki różnoziarnistości oraz wskaźniki krzywizny uziarnienia. Ponadto wykonano analizy laboratoryjne piasku, tj. badania wymywalności metali ciężkich oraz zawartości suchej masy i suchej masy organicznej. Badania laboratoryjne potwierdziły skuteczność redukcji związków organicznych do poziomu poniżej 3% suchej masy oraz wartości metali ciężkich znajdowały się poza zakresem oznaczalności. Na podstawie oceny składu ziarnowego oraz analiz laboratoryjnych udowodniono, że piasek z oczyszczalni ścieków może być wykorzystany jako kruszywo drobnoziarniste w produkcji betonu.
Źródło:
Gospodarka Surowcami Mineralnymi; 2023, 39, 2; 109--123
0860-0953
Pojawia się w:
Gospodarka Surowcami Mineralnymi
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ecological assessment of soil contamination with heavy metals due to the application of mineral fertilisers
Autorzy:
Suleimenova, Naziya
Togisbayeva, Ainura
Orynbasarova, Gulnar
Kuandykova, Elnara
Yerekeyeva, Svetlana
Powiązania:
https://bibliotekanauki.pl/articles/2203536.pdf
Data publikacji:
2023
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
application
assessment
cultivation technology
heavy metals
mineral fertilisers
soil ecology
soil pollution
soybean
fertilisers use
yield
Opis:
The article presents the results of monitoring the aftereffect of the use of excessive zonal doses of mineral fertilisers on soil contamination with heavy metals (HM). With traditional soybean cultivation technology, the level of soil contamination when applying excessive doses (N60 P180 K90) of fertilisers is quite high and indicates violations of the ecological balance of the agroecosystem. By the nature of the accumulation of heavy metals in meadow-chestnut soil, depending on the application of the studied doses (P60 K30, N30 P60 K30, N60 P180K90) of fertiliser, the content of HM (Pb, Zn, Cd) increases. The greatest contamination of the soil with Cu was revealed, the content of which increases to 3.2 mg∙kg-1 of soil, which is higher than the threshold of the maximum permissible concentration (MPC) - 3.0 mg∙kg-1. According to the level of contamination of the soil with copper, it belongs to the highly dangerous classes. In a comparative assessment of the level of soil contamination with HM, optimal norms of mineral fertilisers have been established, namely, against the background of effective resource-saving technology for growing soybeans. The application of fertilisers at a dose of P60 K30 and N30 P60 K30 does not significantly affect the level of soil contamination with HM, optimises the ecological state and nutrient regime of the soil, preserves and restores soil fertility indicators, and increases soybean productivity. This resource-saving technology provides a safe environment for soybean cultivation and a significant increase of 34.5-38.6% in crop productivity (0.53-0.76 Mg∙ha-1) and yield (2.57 Mg∙ha-1).
Źródło:
Journal of Water and Land Development; 2023, 56; 74--80
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of Quinoa Grain Yield and Nutritional Quality by Potassium Fertilization Combined with Foliar Spraying of Seaweed Extract
Autorzy:
Ali, El-Sayed El-Shahat El-Sayed
El-Samad, Emad El-Din Hassanein Abd
Abdelaal, Hala Ahmed
AbouSekken, Mahmoud Saad
Powiązania:
https://bibliotekanauki.pl/articles/24201648.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
Chenopodium quinoa
grain yield
weight of 1000-grain
grain size
grain mineral content
grain nutritional profile
Opis:
The current work was carried out during the two growing seasons of 2016/2017 and 2017/2018 at the Experimental Station of the Environmental Studies and Research Institute, University of Sadat City, Sadat City, Menofia Governorate, Egypt. It aimed to investigate the effect of applying potassium fertilizer at 90, 140 and 190 kg K2O/ha combined with spraying applications of seaweed extract for four times in a 15-day interval starting at 40 days after sowing at rates of 0.0, 1.5 and 3.0 ml/L on the yield, mineral contents and nutritional quality of quinoa grains cv. CICA. A split-plot design was used in three replicates. Results reported that by increasing the application of potassium from 90 to 190 kg K2O/ha, gradual increases in all studied parameters of quinoa grains occurred in the seasons of 2016–2017 and 2017–2018, except for class B grain, Mg and fiber contents. Potassium application at 190 kg K2O/ha gave the highest significant values of all determined parameters in comparison with treatment of 90 kg K2O/ha. In most cases, insignificant differences were detected between potassium fertilizer levels of 140 and 190 kg K2O/ha. Spraying seaweed extract at 3.0 ml/L resulted in superiority of all studied characters except class B grain, Mg and fiber contents, followed by 1.5 ml/L treatment with insignificant differences between them in most cases. There were significant differences among spraying seaweed treatments on Ca, Fe, Mn, protein and fiber contents in both seasons, N, P and K during the first season, and grain yield/plant, total grain yield/ha and Zn content during the second season. The interaction between potassium fertilization levels and spraying applications of seaweed extract had significantly different effects on all studied characters during both seasons, except for Mg percentage. It is evident that the application of potassium fertilization at 140 or 190 kg K2O/ha combined with the spraying of seaweed extract at 3.0 ml/L caused an apparent enhancement of the yield, mineral contents and nutritional quality of quinoa grains during the two experimental seasons.
Źródło:
Journal of Ecological Engineering; 2023, 24, 3; 341--356
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exploration and characterization of barite mineral from Azara-Nassarawa ore deposits from suitabiity in industrial applications
Autorzy:
Nzeh, Nnaemeka Stanislaus
Popoola, Patricia Abimbola
Powiązania:
https://bibliotekanauki.pl/articles/24085980.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
barite
mineral ore
Azara-Nassarawa
gravity concentration
jigging
tabling
concentrate
recovery
specific gravity
Opis:
Primary concentrations of Azara barite deposit in Nassarawa state, Nigeria were conducted; employing simplified gravity concentration techniques. Particle size distribution, specific gravity, physicochemical and morphological analyses of the sample was conducted. These analyses were done in order to establish process efficacy and effectiveness of gravity concentration processes for recovery of barium from the ore deposit, as well as its suitability in various industrial applications, such as the oil and gas sectors. Thus, microstructural, chemical composition and certain physicochemical characteristics/properties of the mineral sample of Azara-Nassarawa barite were determined. XRD, XRF, SEM and EDS analyses were utilized in determining morphology as well as quantitative and qualitative chemical analyses of the sample. Barite sample with average particle size of -355+150μm was subjected to concentration, adopting jigging and tabling gravity separation as the concentration methods. Hitherto, based on quantitative and qualitative chemical analyses conducted, the sample was composed of about 36.2% BaO and 40.5% Ba, respectively; and also possessed an average specific gravity (SG) of about 3.85. Further, the qualitative analysis of the mineral products of jiggling and tabling indicated that jigging had a concentrate recovery of 130.98% Ba with SG increase of 11.2% while tabling had 89.81% Ba recovery with 8.6% SG increase. Assay and SG results confirm gravity concentration efficiency and thus, establish the barite from Azara-Nassarawa ore deposits suitable for certain industrial applications. This will serve as a tool and a step further towards mitigating existing problems or challenges in mineral concentration and processing of such deposits for industrial purposes.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 2; art. no. 166104
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fertilizers and Pesticides Impact on Surface-Active Substances Accumulation in the Dark Gray Podzolic Soils
Autorzy:
Litvinova, Olena
Tonkha, Oksana
Havryliuk, Oleksandr
Litvinov, Dmytrо
Symochko, Lyudmyla
Dehodiuk, Stanislav
Zhyla, Roman
Powiązania:
https://bibliotekanauki.pl/articles/27323836.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
mineral fertilizer
soil
pesticides
anionic surfactants
non-ionic surfactants
crop rotation
biogenic elements
agroecosystem
Opis:
The article reports on a study that examined the impact of agrochemicals on the levels of surfactants in soil. Specifically, the study found that the use of mineral fertilizers and pesticides led to an increase in the levels of anionic surfactants (ASA) in the soil. Furthermore, the simultaneous application of fertilizers and pesticides had a greater effect on ASA levels than either factor alone. The use of pesticides also led to an increase in non-ionic surfactants (NSA), while the use of fertilizers resulted in a decrease in NSA levels. The study also found that the increase in the levels of mobile forms of key nutrients in the soil was associated with the accumulation of ASA in lower layers of the soil profile.The amount of alkaline hydrolyzed nitrogen under the low protection system increased by 3.0–23.2 mg kg-1 soil, mobile phosphorus by 14.0–144.0 mg P2O5, and exchangeable potassium by 9.0–222.0 mg K2O per kg soil, compared to the control. With the complex use of fertilizers and pesticides in one block, a trend of increasing mobile forms of nutrients in the soil was observed. The distribution of ASA amount in the soil profile is descending. The clear presence of ASA was established only in the soil layer of 0–40 cm. An increase of ASA content in the soil due to the use of agrochemicals and fertilizers is observed up to a depth of 60–80 cm. Using biological elements in agriculture significantly reduces the amount of these substances in the soil profile.
Źródło:
Journal of Ecological Engineering; 2023, 24, 7; 119--127
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gravity and electrostatic separation of unburned coal from a selected fly ash
Autorzy:
Wierzchowski, Krzysztof
Klupa, Agnieszka
Białecka, Barbara
Całus Moszko, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/2201434.pdf
Data publikacji:
2023
Wydawca:
Główny Instytut Górnictwa
Tematy:
fly ash
unburned coal
gravity separation
electrostatic separation
mineral inclusions
popiół lotny
niespalony węgiel
separacja grawitacyjna
separacja elektrostatyczna
minerały domieszkowe
Opis:
Unburned coal grains make it difficult to use fly ash economically, which causes energy losses in the fuel. The article presents the possibilities of separating unburned coal from selected fly ash. In order to assess the possibility of separation of unburned carbon, the analysis of grain density and ash composition was used. Unburned coal was separated by four methods – one wet gravity and three dry methods. It has been found that despite very fine ash grains, the quality and quantity of separation products are significantly dependent on the separation method used and the separated grains’ qualitative characteristics. The analysis of the coal grains under an electron microscope has revealed that they contain mineral inclusions. Their presence enables selective separation of carbon without first grinding the middling grains. The most advantageous results of the separation of unburned coal were obtained by the electrostatic separation method. Separated coal can be used in high-value carbon applications.
Źródło:
Journal of Sustainable Mining; 2023, 22, 1; 33--40
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Grindability characterization and work index determination of alluvial ferro-columbite deposits for efficient mineral processing
Autorzy:
Nzeh, Nnaemeka Stanislaus
Adeleke, Abraham A.
Popoola, Patricia Abimbola
Powiązania:
https://bibliotekanauki.pl/articles/24085905.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
alluvial
columbite
mineral
comminution
milling
work index
energy
grindability
Opis:
This study emphasizes on the physicochemical and grindability characteristics and work index of an alluvial formed silica dominated ferro-columbite mineral from Rayfield-Jos minefields in Plateau state, Nigeria. Investigations were also carried out in order to determine the mineralogy of the mineral deposits and most essentially the actual energy consumed during comminution and milling of the mineral so as to achieve the liberation size prior to high efficient mineral processing or beneficiation and the extraction of value metals. The distribution of the mineral particles as well as their sizes was determined, with a mineral liberation size fraction range essentially established as -150+90 μm particle sizes. Mass percentage of each size fraction obtained from PSD analysis conducted before and after comminution was also determined, obtaining 80% passing for both the mineral feeds and comminuted products. Berry and Bruce modified Bond’s work index was therefore obtained, and was determined to be within the range of 2.0414 to 2.5667 kWh/ton. Hence, the energy consumed or required to comminute or grind the Fe-columbite mineral to 80% passing is expected to fall within the range of 0.3613 to 0.4543 kWh. Thus, it could be said that a low milling work index as well as moderately low energy is required for comminution and this can be attributed to the mineralogy, mineral source and alluvial formation of the mineral reserve. Therefore, the grindability/PSD result of the mineral sample indicates that its mineralogy is considered a class of moderately soft mineral type in terms of texture with easy grindability.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 170297
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved of Mechanical Characteristics of Gargar Mud by Mineral Additives
Autorzy:
Mokhtari, Fouzia B. Z.
Youcefi, Abdelkader
Driss, A.A.E.
Ghrici, Mohamed
Powiązania:
https://bibliotekanauki.pl/articles/27314865.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
Gargar dam
mud
lime
pozzolana
mineral additives
tama Gargar
błoto gargarowe
wapno
pucolana
dodatki mineralne
Opis:
The operational dams in Algeria lose 32 million m 3 of water storage capacity each year, and fifteen of these dams are threatened by siltation. This investigation forms a component of a management strategy for dredged silt in the Gargar Dam, the third-largest dam in Algeria with considerable sedimentation. This paper comprises two main axes: a detailed experimental study based on the studied dam mud's physico-chemical, rheological, and mechanical analysis. The second part is based on the study of the valorization of Gargar mud to be acceptable for use in road civil engineering. In order to obtain this goal, the Gargar mud was treated with lime (0-6%), sand (20%), and natural pozzolana (20%). Test results show that the properties of Gargar mud are significantly improved after treatment, and the soil becomes more friable and more resistant; it can therefore be used as a foundation layer in road civil engineering.
Źródło:
Civil and Environmental Engineering Reports; 2023, 33, 4; 73--94
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Nonlinear Shear Modulus Change of Elastomeric Shell of a Composite Tractive Element with a Damaged Structure on its Stress State
Badanie wpływu kompensacji na stabilność górotworu oraz jakość wydobywanej rudy
Autorzy:
Belmas, Ivan
Kolosov, Dmytro
Onyshchenko, Serhii
Bilous, Olena
Tantsura, Hanna
Powiązania:
https://bibliotekanauki.pl/articles/2200993.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
mineral resources
mining
lifting and transporting complexes
damaged structure
elastomeric shell
stress state
analytical solution
surowce mineralne
kompleksy wydobywcze wyciągowe i transportowe
kompozytowy element trakcyjny
uszkodzona konstrukcja
powłoka elastomerowa
stan naprężeń
rozwiązanie analityczne
Opis:
Purpose. Determination of a dependency of a stress state for composite elastomer-cable tractive element with a broken structure on a nonlinear dependency of shear modulus on deformations in the elastomeric shell. Methods. Analytical solution of a model of a composite tractive element with disturbed structure and a deformation-dependent shear modulus of an elastomeric shell. Findings. Algorithm for determining a stress state of a composite tractive element with broken structure and a deformation-dependent shear modulus. Scientific novelty. Character of dependency for a stress state of a composite tractive element on a nonlinear dependency of shear modulus on deformations. Practical significance. A possibility to determine the dependency of a stress state of a composite elastomer-cable tractive element on a nonlinear shear modulu
Artykuł przedstawia studium i analizę funkcjonalną wymagań światowego przemysłu metalurgicznego co do jakości rud żelaza w podziemnych kopalniach Ukrainy. Stwierdzono zależności wpływu kształtu i parametrów przestrzeni kompensacyjnych na ich stateczność i wskaźniki jakości rudy. Udowodniono, że komora wyrównawcza w kształcie trapezu pionowego charakteryzuje się największą stabilnością i jest stabilna w zakresie wszystkich rozważanych głębokości, nawet w rudach o twardości 3–5 punktów. Mniejszą stateczność wykazuje komora kompensacji pionowej o kształcie sklepionym z niewielkimi spadkami w przyczółku sklepienia komory w rudach o twardości 3–5 punktów na głębokości 2000 m. Komora z opadami o rożnym natężeniu występuje w dolnej części nachylonych odsłonięć namiotu w rudach o twardości 3–5 punktów na głębokości 1750 m lub większej. Pomieszczenie kompensacji poziomej ma najmniejszą stateczność; spadki występują w rudach o twardości 3–5 punktów na głębokości 1400 m, a na głębokościach 1750–2000 m pozostają stabilne tylko w rudach twardszych. Stwierdzono, że zastosowanie komór kompensacyjnych o dużej stabilności umożliwia osiągnięcie ich maksymalnej objętości, zwiększenie ilości wydobywanej czystej rudy, zmniejszenie jej rozrzedzenia, poprawę jakości wydobywanej masy rudy, a co za tym idzie, wzrost jej ceny i konkurencyjności rynkowej.
Źródło:
Inżynieria Mineralna; 2023, 1; 147--154
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Legal regulations regarding the admission of raw minerals to the market in the form of agents improving soil properties or liming agents
Regulacje prawne w zakresie dopuszczania surowcowych kopalin do obrotu w postaci środków poprawiających właściwości gleb lub środków wapnujących
Autorzy:
Antonkiewicz, Jacek
Skuta, Ireneusz
Pożyczka, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/31342983.pdf
Data publikacji:
2023
Wydawca:
Poltegor-Instytut Instytut Górnictwa Odkrywkowego
Tematy:
surowce mineralne
kopaliny
wapno
polepszacz glebowy
regulacje prawne
mineral resources
minerals
lime
soil improver
legal regulations
Opis:
The Act on Fertilizers and Fertilization and the Regulations to the Act allow for the marketing of new fertilizers, developed on the basis of natural minerals, mineral raw materials as well as mineral and organic waste, which meet specific requirements in terms of chemical impurities (e.g. heavy metals – Cr, Cd, Ni, Pb, Hg, As) and biological contaminants (live eggs of intestinal parasites: Ascaris sp., Trichuris sp., Toxocara sp., Salmonella bacteria). Fertilizers agents based on mineral raw materials, e.g. calcium, may be placed on the market, provided that the minimum amount of nutrients is maintained and the limits of heavy metals such as cadmium (Cd) and lead (P b), arsenic (As) are observed. The analysis of the chemical composition should show that mineral raw materials in the form of a fertilizer and liming agent are not a potential source of heavy metals for the soil. Fertilizers agents are safe for the environment and, after a positive opinion issued by IUNG-PIB in Puławy, may lose the status of a waste material. These raw materials can then be placed on the market in the form of a soil improver or liming agent.
Ustawa o nawozach i nawożeniu oraz rozporządzenia do ustawy pozwalają na wprowadzenie do obrotu nowych środków nawozowych, opracowanych na podstawie naturalnych kopalin, surowców mineralnych oraz odpadów mineralnych i organicznych, które spełniają określone wymagania w zakresie zanieczyszczeń chemicznych (np. metale ciężkie – Cr, Cd, Ni, Pb, Hg, As) oraz zanieczyszczeń biologicznych (żywych jaj pasożytów jelitowych: Ascaris sp., Trichuris sp., Toxocara sp., bakterii z rodzaju Salmonella). Środki nawozowe otrzymywane na bazie surowców mineralnych, na przykład o charakterze wapniowym, mogą być wprowadzone do obrotu, pod warunkiem zachowania minimalnej ilości składników pokarmowych oraz przy zachowaniu limitów metali ciężkich i innych pierwiastków potencjalnie toksycznych, takich jak kadmu (Cd) i ołowiu (Pb), czy arsenu (As). Z analizy składu chemicznego powinno wynikać, że surowce mineralne w postaci środka nawozowego, wapnującego, nie stanowią potencjalnego źródła metali ciężkich dla gleby. Środki nawozowe są bezpieczne dla środowiska i po pozytywnej opinii wydanej przez IUNG-PIB w Puławach mogą utracić status materiału odpadowego. Następnie surowce te mogą być wprowadzone do obrotu w postaci środka poprawiającego właściwości gleby lub środka wapnującego.
Źródło:
Górnictwo Odkrywkowe; 2023, 64, 2; 50-56
0043-2075
Pojawia się w:
Górnictwo Odkrywkowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low waste technology for the removal of nitrates from water
Autorzy:
Trus, Inna
Gomelya, Mukola
Halysh, Vita
Tverdokhlib, Mariia
Makarenko, Iryna
Pylypenko, Tetiana
Chuprinov, Yevhen
Benatov, Daniel
Zaitsev, Hennadii
Powiązania:
https://bibliotekanauki.pl/articles/27311550.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
mineral fertilizers
ion exchange
nitrates
low-waste technologies
anionite
nawozy mineralne
wymiana jonowa
azotany
technologia niskoodpadowa
jonity
Opis:
As a rule, nitrates are present in all natural water bodies. Their increased concentrations are connected with the discharge of insufficiently treated wastewater from industrial and communal enterprises, agricultural and livestock complexes. Recent scientific publications concerning treatment methods for nitrates removal from natural water and wastewater were analyzed in order to create effective and low-waste technology for obtaining high quality water. It has been established that the ion exchange method is quite effective for removing nitrates from water. In the paper, the processes of ion exchange removal of nitrates from water on low-axis anionite in DOWEX Marathon WBA in Сl- form were investigated. During the sorption of nitrates with a concentration of 186, 205, 223 and 2200 mg/dm3, it was established that the full exchangeable dynamic capacity was 1.075, 1.103, and 1.195, 1.698 g-eq/dm3, respectively. To regenerate anionite, solutions of ammonia as well as potassium chloride, ammonium chloride and potassium carbonate were used in this work. The choice of potassium and ammonium compounds is due to the prospect of further use of regeneration solutions for the production of liquid fertilizers.
Źródło:
Archives of Environmental Protection; 2023, 49, 1; 74--78
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mineral investment risk assessment of host countries based on a cloud matter-element model
Ocena ryzyka inwestycji w minerały w krajach przyjmujących w oparciu o model chmury materii i pierwiastka
Autorzy:
Hou, Jie
Li, Guoqing
Ling, Jiahong
Chen, Lianyun
Zhao, Wei
Sheng, Baoli
Powiązania:
https://bibliotekanauki.pl/articles/27311628.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
mineral investment
cloud matter element model
investment risk
risk assessment
inwestycje w surowce mineralne
model materii chmury
ryzyko inwestycyjne
ocena ryzyka
Źródło:
Gospodarka Surowcami Mineralnymi; 2023, 39, 4; 23--48
0860-0953
Pojawia się w:
Gospodarka Surowcami Mineralnymi
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mineral Pumice Efficiency in Wastewater Treatment in Dairy Industries
Autorzy:
Vanani, Hamid Raeisi
Ostad-Ali-Askari, Kaveh
Powiązania:
https://bibliotekanauki.pl/articles/31340456.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
Mineral pumice
Sewage of the dairy industries
COD
Sewage treatment
Opis:
In this study, the effectiveness of mineral pumice application in sewage treatment in the dairy industries was investigated, with various factors such as adsorbent dose, mixing speed, pH and contact time being studied in detail. The results obtained showed that mineral pumice in a granular form, with a contact time of 20 hours and a volume fraction of one third and pH of 8 has the ability to COD (Chemical Oxygen Demand) decreasing up to 56.9%. However, by using mineral pumice in powder form, in three cases considered, higher efficiency than for pumice granules has been observed. It seems that acidity conditions do not have a positive effect on this efficiency. As the contact time increased, the adsorption rate increased, mostly due to increased probability of collision with the adsorbent surface. With an increasing adsorbent dose, the absorption rate also increased, especially in the range of 15 g/l. Regarding the mixing speed, no definite conclusion can be drawn, because in some cases, with increasing mixing speed, the COD reduction efficiency decreased. Considering the use of mineral pumice in reducing COD, in accordance with to the obtained results, it is better to use mineral pumice in granular, rather than in powder, form.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2023, 70, 1; 129-139
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 1387

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