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Wyszukujesz frazę "column leaching" wg kryterium: Temat


Wyświetlanie 1-5 z 5
Tytuł:
A study on heavy metals mobility from zinc plant residues in Iran
Autorzy:
Moradkhani, D.
Eskandari, S.
Sedaghat, B.
Najafabadi, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/110826.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
heavy metals
zinc leaching plant
leaching filter cake
column leaching
Opis:
The transport of heavy metals from mining disposal site to groundwater and surface water is one of the most serious environmental problems in the world. The transport of heavy metals such as Zn, Cd and Mn from leaching filter cake in RECo, Zanjan, Iran was examined by using column leaching. Parameters studied included: flow rate, pH of input solution and leaching time. In this study, the maximum dissolution percents of Zn, Cd and Mn in input solution pH of 5 were 45.50 %, 53.97% and 19.94%, respectively. To statistically analysis the experimental results, SPSS14 software was employed. The results of SPSS 14 indicated that for the Zn, Cd and Mn dissolution, time and flow rate were found respectively, the effective parameters for the pollution in zinc leach residues.
Źródło:
Physicochemical Problems of Mineral Processing; 2013, 49, 2; 567-574
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison of uranium recovery from low-grade ore by bioleaching and acid leaching
Autorzy:
Szolucha, M. M.
Chmielewski, A. G.
Powiązania:
https://bibliotekanauki.pl/articles/109808.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
bioleaching
acid leaching
column leaching
low-grade ore
uranium
recovery
shrinking core model
Opis:
The objective of this work was to compare the bioleaching with the acid leaching of uranium under similar process conditions within 65 days. The low-grade uranium ore used in the experiments was collected from Radoniow’s ‘small’ dump, Poland. Bioleaching and acid leaching studies were carried out in identical columns. The isolated bacterial consortium from the Radoniow’s mine was used for the bioleaching process. A solution of sulphuric acid and H2O2 as oxidizing agent was used for the acid leaching. The extraction of uranium under acid leaching conditions reached maximum of 64±13 % w/w after 31 days. The bioleaching of uranium achieved a maximum extraction of 75±15 % w/w after 55 days. In this study an attempt was made to demonstrate the relationship between the shrinking-core model and the experimental data by plotting the fractional conversion of uranium against time.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 1; 136-149
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of pyritic tailings from a copper concentration plant for calcareous sodic soil reclamation
Autorzy:
Tozsin, G.
Arol, A. I.
Cayci, G.
Powiązania:
https://bibliotekanauki.pl/articles/109593.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
waste pyrite
gypsum
pyrite oxidation
column leaching test
sodic soil
reclamation
Opis:
This study was aimed to investigate the feasibility to use waste pyrite and sulphuric acid produced from waste pyrite for the reclamation of calcareous sodic soils. The final aim is to displace Na from an exchange complex and replace it with Ca, leading to a decrease in pH and exchangeable sodium percentage (ESP) and an improvement of soil structure. A fertility of the soil may also be enhanced by this technique since waste pyrite can be rich in several micronutrients. An additional advantage to this strategy is that waste pyrite is inexpensive and readily available in large quantities, by contrast to gypsum. In this study, column-leaching tests were carried out to evaluate a change in soil properties upon addition of gypsum and pyritic tailing amendments from a copper concentration plant. An availability of essential micronutrients for a plant growth (Fe, Cu, Zn and Mn) and hazardous potential of pyritic tailings in terms of heavy metal contamination were taken into account. Gypsum, powder waste pyrite and sulfuric acid produced from waste pyrite were applied to the soil with reference to the gypsum requirement (GR) of the soils. The results showed that application of waste pyrite with a dose of 44.74 megagrams per ha was superior to gypsum of 55.20 Mg/ha dose in terms of exchangeable sodium percentage (ESP) in 42 weeks. In addition, application of all the concentrations of sulfuric acid produced from waste pyrite also decreased the ESP values. The best values with sulfuric acid were obtained with a dose of 35.31 Mg/ha in 26 weeks. It was observed that the content of all micronutrients in the soil increased significantly (P<0.01) with waste pyrite and sulfuric acid applications. The levels of the micronutrients after treatments can be classified sufficient for the plant growth except for the iron level with the minimum dose of sulfuric acid application 17 Mg/ha. The heavy metal content in the soil after treatment with the pyritic tailings was found to be lower than the legal limit values. Thus, waste pyrite can be effectively used since rapid amelioration of calcareous sodic soils is possible with no deleterious heavy metal contamination.
Źródło:
Physicochemical Problems of Mineral Processing; 2014, 50, 2; 693-704
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of particle size on chalcocite dissolution kinetics in column leaching under controlled Eh and its implications
Autorzy:
Phyo, Htet Aung
Jia, Yan
Tan, Qiaoyi
Zhao, Shenggui
Liang, Xinxing
Ruan, Renman
Niu, Xiaopeng
Powiązania:
https://bibliotekanauki.pl/articles/1449094.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
particle size
column leaching
chalcocite
shrinking core model
X-ray CT
Opis:
Natural high grade chalcocite samples were leached in column under controlled Eh, constant temperature and solution pH to investigate the effect of particle size on dissolution kinetics. Moreover, low grade ores of larger size fractions were leached in column using raffinate from the industrial heap as an irrigation solution to simulate the real heap conditions. The leaching rate of large particle sizes (31-200 mm) were very slow without inflection point which are normally present in the leaching of small particle sizes (0.054-31 mm). The effect of particle size was more remarkable in the dissolution of large particles than that of small particles during the first stage (<45% dissolution). However, the dissolution rate of the second stages (>45% dissolution) were not noticeably affected by the particle size. Results of kinetics analysis of leaching of small particles using shrinking core model indicated that the first stage was controlled by fluid diffusion and confirmed by the low activation energies (20.98 kJ/mol). The kinetics of second stage was controlled by chemical reaction and product layer diffusion and the later control became prominent with increasing particle size. Similarly, product layer diffusion was the rate-controlling step for the first and second stages of leaching of large particles. X-ray CT and SEMEDS studies observed the increasing numbers of cracks and porosity and the formation of sulfur layer on the surface of the residue samples. The findings in this study provided some useful implications to optimize the heap performance and understand the leaching behavior of large particles.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 4; 676-692
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utilization of Coal Ash for Preparation of Seedbed in Disturbed Land in Indonesian Open Cut Coal Mine
Zastosowanie popiołu węglowego do przygotowania podłoża na ziemiach zlokalizowanych w rejonie indonezyjskiej odkrywkowej kopalni węgla
Autorzy:
Hamanaka, A.
Shimada, H.
Ogata, S.
Sasaoka, T.
Miyajima, I.
Powiązania:
https://bibliotekanauki.pl/articles/318577.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
Acacia mangium
popiół węglowy
test ługowania kolumnowego
test wegetacji w warunkach laboratoryjnych
rekultywacja
coal ash
column leaching test
laboratory vegetation test
rehabilitation
Opis:
The amount of coal ash disposed as industrial wastes is increasing with increasing coal demands all over the world. Although coal ash is generally disposed by landfill, the demand of effective utilization of them is increasing because of the limitation of the disposal site. Moreover, in Indonesia, most of soil is classified as acrisol which is acid and clay-rich soil. As the plant growth is inhibited under the acid and low permeability, the utilization of coal ash is expected in order to improve physical and chemical conditions of seedbed in the revegetation area. In this paper, the utilization of coal ash for preparation of seedbed in disturbed land in Indonesian open cut coal mine is discussed by means of several laboratory tests, column leaching test, and laboratory vegetation test by using Acacia mangium. Considering the obtained results, it was suggested that the coal ash can be utilized to improve the physical and chemical conditions of seedbed and the growth rate of Acacia mangium by incorporated into soil with proper mixture rate.
Ilość popiołu węglowego składowanego jako odpady przemysłowe narasta wraz ze wzrostem zapotrzebowania na węgiel w świecie. Mimo tego, że popiół węglowy jest zazwyczaj deponowany na składowiskach wzrasta zapotrzebowanie na jego efektywną utylizację ze względu na ograniczoność miejsc przeznaczonych na jego składowanie. Ponadto, w Indonezji większość gleb jest klasyfikowana jako akrisol, który jest glebą kwaśną i bogatą w ił. Wzrost roślin jest hamowany przez zakwaszenie i niską przepuszczalność i z tego powodu oczekuje się, że popiół węglowy spowoduje poprawę warunków fizycznych i chemicznych podłoża w rejonie wegetacji. W artykule przedstawiono zastosowanie popiołów węglowych do przygotowania podłoża w rejonie indonezyjskiej kopalni odkrywkowej węgla za pomocą wielu testów laboratoryjnych, testów ługowania kolumnowego oraz testów wegetacji w warunkach laboratoryjnych przeprowadzonych za pomocą Acacia mangium. Ze względu na otrzymane wyniki, sugeruje się, że popiół węglowy może być zastosowany w celu poprawy warunków fizycznych i chemicznych podłoża oraz powoduje poprawę wzrostu Acacia mangium przy odpowiednim jego dozowaniu.
Źródło:
Inżynieria Mineralna; 2016, R. 17, nr 1, 1; 109-116
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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