Temat: Pretreatment - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Influence of Temperature and Reaction Time on the Efficiency of Alkaline Pretreatment of Hay Biomass
Autorzy:: Zdeb, Magdalena
Skóra, Aneta
Pawłowska, Małgorzata
Powiązania:: https://bibliotekanauki.pl/articles/1839082.pdf
Data publikacji:: 2021
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: lignocellulosic biomass
hay
alkaline pretreatment
thermal pretreatment
Opis:: Low biodegradability caused by polymeric structure is the main barrier in the use of lignocellulosic materials in biofuels production by using biological methods. Pretreatment of the biomass is the way to improve the suitability of hardly biodegradable biomass for biogas or bioethanol production. Evaluation of the influence of thermal and thermochemical alkaline pretreatment on the efficiency of hydrolysis of hay (mixture of various grass species) was the aim of the study. The batch scale experiment was carried out with the use of NaOH and distilled water as solvents, and the changes in pretreatment time (2, 4 and 8 hours) and temperature (22 and 80°C) were also considered. The efficiency of biomass solubilisation was assessed based on the results obtained from the measurements of chemical oxygen demand (COD) and volatile fatty acids (VFA) concentration in the hydrolysates. The solubility of the biomass, expressed as a percentage of soluble COD in total COD, was calculated. The experiment showed that the highest solubilisation of hay biomass was observed at 80°C under alkaline conditions. In this case, the solubility of the COD was 3-times higher, and the VFA concentration in hydrolysates was 4-times higher in comparison to the distilled water-based test at 22°C. It was noted that time of the process significantly influenced the efficiency of biomass solubilisation only during the experiment carried out at 22°C. Extension of hydrolysis time from 2 to 8 hours increased the value of soluble COD of 70% and 55% for water and alkaline solvent, respectively. The process conducted at 80°C was not time-dependent over the considered period.
Źródło:: Journal of Ecological Engineering; 2021, 22, 2; 120-127
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The Impact of Alkali Pretreatment and Organic Solvent Pretreatment on Biogas Production from Anaerobic Digestion of Food Waste
Autorzy:: Shitophyta, Lukhi Mulia
Padya, Syaeful Akbar
Zufar, Ahmad Fatwa
Rahmawati, Novia
Powiązania:: https://bibliotekanauki.pl/articles/2202295.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: alkali pretreatment
biodegradability
biogas
food waste
organic solvent pretreatment
Opis:: Anaerobic digestion of food waste is an encouraging technology for biogas production. Pretreatment of the substrate is needed to increase biodegradation. This study aimed to investigate the effect of alkali pretreatment and organic solvent pretreatment on biogas production. Physical pretreatment was also applied in this study. NaOH (0%, 2%, 4% and 6%) was used as alkali pretreatment. Ethanol (0, 2, 4 and 6%) was used as organic solvent pretreatment. The experiment was conducted in a 1 L batch digester under room temperature. Results showed that 0% NaOH generated the highest cumulative biogas yield of 46.1 mL/gVS. The best biodegradability of 37.5% was achieved in NaOH of 0%. The lower concentration of ethanol generated a higher biogas yield. The greatest cumulative yield of 41.5 mL/gVS was obtained at an ethanol concentration of 0% with a biodegradability of 33.84%. Statistical analysis proved that alkali pretreatment and organic solvent pretreatment had no significant effect on biogas production (p>0.05). Physical pretreatment had a significant effect (p<0.05) with the highest cumulative yield of 58.2 mL/gVS. The kinetic model proved that the modified Gompertz was a suitable model for predicting and simulating the kinetics of anaerobic digestion from food waste (R2 > 0.9).
Źródło:: Journal of Ecological Engineering; 2022, 23, 12; 179--188
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Pre-treatment of biomass by torrefaction - preliminary studies
Toryfikacja jako proces obróbki biomasy - badania wstępne
Autorzy:: Witczak, M.
Walkowiak, M.
Cichy, W.
Powiązania:: https://bibliotekanauki.pl/articles/52855.pdf
Data publikacji:: 2011
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Tematy:: biomass pretreatment
biomass
torrefaction process
pretreatment process
pelletization process
pellet
Opis:: Torrefaction is a mild pre-treatment of biomass at the temperatures range from 200°C to 300°C. This report presents preliminary studies of torrefaction process for different types of raw material. A torrefied product has a brown/black colour, reduced moisture content, and increased heating value (HHV and LHV). It has favourable properties for application as a fuel for gasification and combustion.
Przedstawiono wyniki uzyskane w trakcie wstępnych badań procesu toryfikacji wybranych materiałów lignocelulozowych. Otrzymane produkty toryfikowane charakteryzowały się brązowo-czarną barwą, niską wilgotnością oraz podwyższoną wartością ciepła spalania i wartością opałową, co wpływało korzystnie na poprawę właściwości paliwowych badanych próbek biomasy. Toryfikacja jest procesem łagodnej obróbki wstępnej biomasy, zachodzącym w temperaturze 200-300°C pod ciśnieniem atmosferycznym w atmosferze gazu obojętnego. Wydajność masy i energii procesu toryfikacji jest zależna od temperatury, czasu oraz typu biomasy poddawanej toryfikacji. Prędkość wzrostu temperatury procesu, według danych literaturowych, nie przekracza 50°C na minutę, a czas jego trwania oscyluje najczęściej w granicach jednej godziny. W trakcie toryfikacji następuje częściowa dekompozycja biomasy z wydzieleniem produktów lotnych. Pożądany produkt toryfikacji jest ciałem stałym, określanym jako biomasa toryfikowana. Uzyskane wyniki pozwalają na planowanie dalszych prac badawczych w tym zakresie.
Źródło:: Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2011, 54, 185
1644-3985
Pojawia się w:: Drewno. Prace Naukowe. Doniesienia. Komunikaty
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Effectiveness of using physical pretreatment of lignocellulosic biomass
Autorzy:: Piątek, Milena
Bartkowiak, Anna
Powiązania:: https://bibliotekanauki.pl/articles/27312631.pdf
Data publikacji:: 2023
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: biogas yield
biomass conversion
energy efficiency
thermal efficiency
lignocellulosic biomass
ultrasonic pretreatment
hydrothermal pretreatment
Opis:: Pretreatment is aimed at making lignin structures, which in turn causes decrystallisation and depolymerisation of cellulose. This treatment allows to increase the energy potential of substrates. A properly selected method allows for obtaining larger amounts of biogas with a high content of biomethane. The aim of the study was to analyse selected pretreatment methods (ultrasonic and hydrothermal) for biogas yield, including biomethane, and to demonstrate the effectiveness of obtaining additional electricity and heat from these methods. It was based on the literature data. On basis the study, the following information was obtained: average yield of biogas and biomethane before and after treatment, difference in yield of biogas and biomethane after treatment, and the effect of treatment on the substrate used. Moreover, an estimate was made of the effectiveness of obtaining additional electricity and heat from selected pretreatment methods compared to hard coal. Based on the analysis of the ultrasonic treatment analysis, it was shown that the best result was obtained with the ultrasound treatment of the mixture of wheat straw and cattle manure with the following parameters: frequency 24 kHz, temperature 44.30°C, time 21.23 s. This allowed a 49% increase in biogas production. The use of pretreatment would therefore allow the production of more electricity and heat capable of replacing conventional heat sources such as coal.
Źródło:: Journal of Water and Land Development; 2023, 58; 62--69
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Selective flotation separation of chalcopyrite and sphalerite by thermal pretreatment under air atmosphere
Autorzy:: Zhou, Hepeng
Geng, Liang
Zhang, Yongbing
Yang, Zhizhao
He, Kunzhong
Xie, Fanxin
Powiązania:: https://bibliotekanauki.pl/articles/1448899.pdf
Data publikacji:: 2021
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: thermal pretreatment
chalcopyrite
sphalerite
flotation
oxidation
Opis:: Thermal pretreatment was performed to enhance the flotation separation of chalcopyrite and sphalerite under the air atmosphere for the first time. Microflotation experiment showed that the floatability of chalcopyrite vanished after thermal pretreatment at above 170℃. By contrast, the floatability of sphalerite was well maintained with a flotation recovery of 90%. In artificial mixed mineral flotation experiments, the separation of sphalerite and chalcopyrite was successfully realized by thermal pretreatment. Results of Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy analyses indicated that the chalcopyrite surface was oxidized dramatically at 170℃, and hydrophilic species such as sulfate ($SO_4^{2-}$), oxides ($CuO$ and $Fe_2O_3$), and hydroxyl species ($Fe(OH)_3$) were formed on the surface. Hence, the adsorption of potassium butyl xanthate on chalcopyrite decreased significantly after thermal pretreatment. The reason for the higher oxidation speed of chalcopyrite than that of sphalerite was also analyzed.
Źródło:: Physicochemical Problems of Mineral Processing; 2021, 57, 1; 305-314
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Effects of ultrasonic pretreatment on the flotation behavior of galena with and without the presence of pyrite
Autorzy:: Lu, Dongfang
Chen, Lanlan
Ma, Yongyi
Zheng, Xiayu
Wang, Yuhua
Powiązania:: https://bibliotekanauki.pl/articles/1449431.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: galena
ultrasonic pretreatment
flotation
electrochemical reaction
Opis:: Utilizing the ultrasonic pretreatment, flotation tests, ICP-OES, and XPS analysis, the effect of the different ultrasonic pretreatment methods on the flotation behavior of galena were investigated. The flotation recovery of galena was improved for pretreated single galena sample, which is mainly attributed to the efficient removal of the oxidized components and contaminants on the surface of galena by the acoustic cavitation. However, the flotation recovery of galena was decreased when pretreated mixture sample of galena and pyrite was used. Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES) and X-ray photoelectron spectroscopy (XPS) results reveal that ultrasonic pretreatment facilitates the conversion of $PbS$ to $Pb(OH)_2$ and $PbSO_4$. Besides, the flotation recovery of galena was affected to varying degrees when the galena was mixed with the pyrite of the different particle sizes in the ultrasonic pretreatment process. The reason is that the change in the surface area ratio of these two minerals affects the electrochemical reaction rate between galena and pyrite.
Źródło:: Physicochemical Problems of Mineral Processing; 2020, 56, 4; 611-624
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Monosubstrate fermentation of chicken manure after pretreatment using cold and hot water extraction
Autorzy:: Konkol, I.
Sołowski, G.
Cenian, A.
Powiązania:: https://bibliotekanauki.pl/articles/1191792.pdf
Data publikacji:: 2019
Wydawca:: Gdańska Szkoła Wyższa
Tematy:: chicken manure
monosubstrate fermentation
pretreatment
water extraction
Opis:: Simple pretreatmentof raw chicken manureby cold and hot water extractionincreased the crucial for fermentation C:N ratio 2 to 2.7-fold. The pretreated chicken manure thus became suitable for methane fermentation as monosubstrate, this is due to higher C:N ratio. Cumulative methane and biogas production after pretreatment increasedabout 18–40% and 16–45%, respectively.
Źródło:: Eco-Energetics: technologies, environment, law and economy; 2019, 2; 79--84
2657-5922
2657-7674
Pojawia się w:: Eco-Energetics: technologies, environment, law and economy
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Investigation of the effect of cyanidation after microwave roasting treatment on refractory gold/silver ores by characterization studies
Autorzy:: Yoğurtcuoğlu, Emine
Powiązania:: https://bibliotekanauki.pl/articles/2200333.pdf
Data publikacji:: 2023
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: pretreatment
microwave
cyanidation
characterization
refractory gold-silver
Opis:: In this article, the efficiency of microwave pretreatment, which is an environmentally friendly, low-energy consuming method for recovery from refractory gold-silver ores, was investigated. The ore sample belonged to the oxidized Bolkardağ deposit, which contains carbonate (calcite, dolomite, smithsonite, hydrozincite), silicate (quartz, hemimorphite), sulfate (beudantite, plumbo-jarosite), and iron oxy/oxyhydroxide (hematite, limonite) minerals. Sulfur/sulfate-bearing silver and gold minerals are found either together with gangue minerals or in inclusions. Approximately 90% gold and 48% silver recovery efficiencies were achieved with the cyanide process after microwave preroasting from the ore. Additionally, the ore, heat treatment product, and waste samples were investigated by characterization studies. In these studies, bond structures, mineral content, sample mass losses, element percentage content differences, and mineral percentage content differences in the samples were determined. As a result, the microwave pretreatment application in cyanidation was presented as a new research topic in terms of its application in the valuable refractory content of this type of oxide.
Źródło:: Physicochemical Problems of Mineral Processing; 2023, 59, 1; art. no. 157487
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Simple and Combined Pretreatment of a Mixture of Forestry and Aromatic-Medicinal Plant Waste by Chemical, Physical and Enzymatic Methods
Autorzy:: Bendaoud, Ahmed
Belkhiri, Abdelkhalek
Maai, Mohamed
Moubchir, Tarik
Hmamou, Anouar
Tlemcani, Sara
Eloutassi, Noureddine
Lahkimi, Amal
Powiązania:: https://bibliotekanauki.pl/articles/24201758.pdf
Data publikacji:: 2023
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: biomass
lignocellulosic complex
pretreatment
cellulose
plant waste
Opis:: Forestry waste (FW) extracted parts ofmedicinal-aromatic plant waste (EPW) and unused parts (UPW) are considered potential resources for energy recovery (their heating value of approximately 19 MJ/kg).In order to valorize lignocellulosic biomass, a pretreatment process is required to hydrolyze the recalcitrant lignocellulosic complex into fermentable simple sugars. The aim of this study is to determine the best method of pretreatment that takes into account treatment time, efficiency, and environmental friendliness. The mixture of FW, EPW, and UPW was treated by simple and combined treatment using different methods like acid sulfuric (Ac), steam explosion (SE), and enzymatic (E) (cellulase and hemicellulase).The results showed that the combined and simple Ac treatments are the mostefficient compared with SE and E treatments in the hydrolysis of polysaccharide of cellulose with a rate respectively of 90.5% and 77.6% and hemicellulose with a rate respectively of 80.63% and 87.14%. In addition, both of the preceding methods release an important rate of total phenolic compounds. Combined treatment demands high time but is friendly (approximately 1 day), and Ac treatment is less time-consuming (about 25 min) but harmful to the environment and causes the corrosion of equipment.In conclusion, combined treatment can be the best method and the high time required can be reduced with the progress of the research.
Źródło:: Journal of Ecological Engineering; 2023, 24, 4; 376--383
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Effect and mechanism of surface pretreatment on desulfurization and desilication from low-grade high-sulfur bauxite using flotation
Autorzy:: Zhou, Jieqiang
Mei, Guangjun
Yu, Mingming
Li, Haonan
Powiązania:: https://bibliotekanauki.pl/articles/110740.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: bauxite
surface pretreatment
flotation
desulfurization and desilication
Opis:: Surface pretreatment using a hot alkaline solution was carried out to improve the effect of desulfurization and desilication on low-grade bauxite with high sulfur content. The results demonstrated that, after surface pretreatment, a maximum grade and recovery of 66.17% and 87.27%, respectively, were achieved, and the sulfur content and ratio of A/S were 0.19% and 7.09, respectively. The surface pretreatment mechanism was further analysed by XRD and SEM analyses. The improved results of desulfurization and desilication were attributed to the selective corrosion of aluminosilicate minerals in coarse particles, reducing the active silicon sites on the surface of coarse particles as well as enhancing the cation exchange between the collector and aluminosilicate minerals.
Źródło:: Physicochemical Problems of Mineral Processing; 2019, 55, 4; 940-950
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Mechanical Pretreatment of Lignocellulosic Biomass for Methane Fermentation in Innovative Reactor with Cage Mixing System
Autorzy:: Rusanowska, P.
Zieliński, M.
Dudek, M.
Dębowski, M.
Powiązania:: https://bibliotekanauki.pl/articles/125456.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: pretreatment
lignocellulose
methane production
net energy efficiency
Opis:: Disintegration of lignocellulosic biomass for energy purposes has been extensively studied. The study aimed to investigate the influence of crushed and uncrushed lignocellulosic biomass on the biogas production in an innovative reactor. The substrate fed to the reactor was Sida hermaphrodita silage mixed with cow manure. The bioreactor had an innovative design of the mixing cage system. The mixing system of the bioreactor consisted of two cylindrical stirrers in the form of a cage. The cages simultaneously rotate around the axis of the bioreactor at against their own axes. The bioreactor is currently presented under the Record Biomap program (Horizon 2020). The bioreactor was operated at organic compounds loading of 2 kg/(m³∙d) and 3 kg/(m³∙d) and hydraulic retention time was 50 d and 33 d, respectively. The biogas production under the organic compounds loading of 2 kg VS/(m³∙d) was 680 L/kg VS from crushed lignocellulosic biomass and 570 L/kg VS from uncrushed lignocellulosic biomass. The biogas production under the organic compounds loading 3 kg VS/(m³∙d) was 730 L/kg VS from crushed lignocellulosic biomass and 630 L/kg VS from uncrushed lignocellulosic biomass. The crushing of substrate did not influence the methane content in the biogas. In all experiments, the biogas comprised about 54% of methane. The net energy efficiency was calculated as well.
Źródło:: Journal of Ecological Engineering; 2018, 19, 5; 219-224
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Oczyszczanie ścieków ze stacji naprawy samochodów
Treatment of Wastewater from Car Service Station
Autorzy:: Piecuch, T.
Andriyevska, L.
Dąbrowski, J.
Dąbrowski, T.
Juraszka, B.
Kowalczyk, A.
Powiązania:: https://bibliotekanauki.pl/articles/1818559.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:: flotacja
ścieki zaolejone
podczyszczanie
flotation
oily wastewater
pretreatment
Opis:: The paper presents exploratory examinations on possibility of pre-treatment of wastewater containing gasoline and diesel fuel, that is wastewater “produced” in each car service and repair workshop and in gas station. It is a vast number of service points, which, though daily produce small amounts of wastewater but in the scale of the whole country amount of wastewater is substantial. Such wastewater is usually piped off into the sewage system. Often oily wastewater does not meet requirements set by local companies which own the municipal sewage treatment plants. Therefore, authors made have undertaken considerations on the concept of use the flotation process for pre-treatment of wastewater containing oil and gasoline, as a small wastewater treatment plant that could be installed in a separate room of garage or gas station. Example diagram is shown in Figure 5. This paper presents preliminary testing of a pilot-distinctive nature. Laboratory tests of flotation process were carried out in two independent study groups, ie. one with use of model wastewater and second with the use of real wastewater. Conducted examinations and analysis of the results allow to draw certain conclusions: 1. Wastewater from car service stations, mechanical garages and also gas stations are contaminated with oil derived compound, and although individual garage produces small amounts of wastewater, the sum of all wastewater in the scale of the whole country each day is substantial. 2. Proposed small installation for pre-treatment of oily wastewater, when implemented In the car service station or gas station will improve quality of wastewater daily inputted to sewage system. 3. The flotation process which is the first node of proposed technological installation does not treat wastewater sufficiently, but noticeably, and thus it allows to extend the life of an important node of the installation, that is sorption process. 4. Research should be continued on a small experimental plant installed in the car or gas station.
Źródło:: Rocznik Ochrona Środowiska; 2015, Tom 17, cz. 1; 814-832
1506-218X
Pojawia się w:: Rocznik Ochrona Środowiska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Wpływ metody wstępnej obróbki surowca lignocelulozowego na efektywność hydrolizy enzymatycznej
Influence of pretreatment methods on enzyme catalyzed hydrolysis of lignocellulose biomass
Autorzy:: Dąbkowska, K.
Chmielewska, I.
Pilarek, M.
Szewczyk, K. W.
Powiązania:: https://bibliotekanauki.pl/articles/2071706.pdf
Data publikacji:: 2012
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: obróbka wstępna
hydroliza
lignoceluloza
lignocellulose
pretreatment
enzymatic hydrolysis
Opis:: Hydroliza stanowi kluczowy etap w procesie otrzymywania biopaliw z surowców lignocelulozowych. W pracy przedstawiono wyniki badań enzymatycznej hydrolizy surowca z wierzby energetycznej. Przed hydrolizą surowiec poddawano obróbce wstępnej fizycznej (z wykorzystaniem promieniowania jonizującego oraz metodą eksplozji pary) lub chemicznej (kwaśnej lub zasadowej). Po 72 h hydrolizy największe stężenia glukozy uzyskano w przypadku, gdy surowiec poddano obróbce z użyciem kwasu fosforowego i etanolu.
Hydrolysis is one of the most important steps in the production of biofuels from lignocellulose materials. The results of enzyme catalyzed hydrolysis of lignocellulose from energy willow is presented in the paper. Before hydrolysis, lignocellulose material has been pretreated chemically or by physical methods (ionic radiation or steam explosion). The highest glucose concentration has been obtained after 72 hours in case of lignocellulose pretreated with phosphoric acid and ethanol.
Źródło:: Inżynieria i Aparatura Chemiczna; 2012, 4; 112-114
0368-0827
Pojawia się w:: Inżynieria i Aparatura Chemiczna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Flotation of long flame coal pretreated by polyoxyethylene sorbitan monostearate
Autorzy:: Ni, C.
Xie, G.
Li, Z.
Bu, X.
Peng, Y.
Sha, J.
Powiązania:: https://bibliotekanauki.pl/articles/110299.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: flotation
hydrophobicity
low rank coal
Tween 60
pretreatment
Opis:: In this investigation, polyoxyethylene sorbitan monostearate (Tween 60) was used to improve flotation of fine long flame coal. The flotation recovery of long flame coal could be increased when long flame coal was either pretreated or conditioned with Tween 60 in a flotation cell for a period before the addition of collector. Fourier Transform Infrared (FTIR) technique was used to indicate surface properties of long flame coal. The results of FTIR show that there are many oxygen functional groups on the sur-face. Contact angle measurements were used to indicate changes in hydrophobicity of coal surface before and after Tween 60 and/or diesel pretreatments. The results of contact angle measurements show that hydrophobicity of coal can be increased by Tween 60. Tween 60 can also enhance adsorption of diesel on the coal surface, and hence floatability of long flame coal can be further improved. Tween 60 primarily enhances the flotation recovery of low density coal fractions (<1.5 and 1.5-1.8 kg/dm3). However, the increase in flotatation recovery is less significant with an excessive addition of Tween 60.
Źródło:: Physicochemical Problems of Mineral Processing; 2016, 52, 1; 317-327
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Strengthening the rough selection effect of n-ethyl o-isopropyl thionocarbamate (Dow: Z-200) on chalcopyrite by ultrasonic pretreatment
Autorzy:: Wang, Yan
Wang, Yubin
Yu, Bo
Wang, Xin
Ma, Xiaoxiao
Powiązania:: https://bibliotekanauki.pl/articles/1448798.pdf
Data publikacji:: 2021
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: ultrasonic pretreatment
Z-200
action mechanism
chalcopyrite flotation
Opis:: In this study, the properties of $(CH_3)_2CHOC(S)NHC_2H_5$(Dow: Z-200) after the ultrasonic pretreatment was characterized by employing surface tension, viscosity, and Fourier transform infrared (FTIR) spectroscopy, and its influence on chalcopyrite rough selecting was investigated. The results indicate that the pretreated Z-200 can improve the index of chalcopyrite roughing. And, under the same reagent system, the recovery of copper reached 82.84% which was an increase of 24.44% compared with the untreated when Z-200 after ultrasonic pretreatment was applied to the rough separation of chalcopyrite. The reason why ultrasonic can strengthen the flotation effect of Z-200 on chalcopyrite is that ultrasonic pretreatment can decrease the surface tension and viscosity of Z-200 and enhance its foaming performance. Meanwhile, the ultrasonic cavitation destroys the molecular structure of Z-200, so that the relative proportion of methyl absorption peak and amine absorption peak in Z-200 increases. This also further improves the collection performance and foaming performance of Z-200 and strengthens its separation effect on chalcopyrite. The research provides a new idea for Z-200 to act on chalcopyrite and improve its flotation efficiency, reduce the amount of flotation reagent, and its pollution to the environment. It also provides a theoretical basis for expanding the application of ultrasonic technology in the field of flotation.
Źródło:: Physicochemical Problems of Mineral Processing; 2021, 57, 1; 64-74
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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