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    Wyświetlanie 1-11 z 11
    Tytuł:
    Bioleaching of nickel by Aspergillus humicola SKP102 isolated from Indian lateritic overburden
    Autorzy:
    Ghosh, S.
    Paul, A. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/92057.pdf
    Data publikacji:
    2016
    Wydawca:
    Główny Instytut Górnictwa
    Tematy:
    Fungal bioleaching
    Aspergillus humicola
    chromite mining overburden
    nickel leaching
    bioługowanie
    wymywanie niklu
    Opis:
    The lateritic deposits spread over the Eastern Ghats of Sukinda Valley, Odisha, India, produce a huge amount of overburden annually as a byproduct of chromite mining. This chromite mining overburden contains nickel, the only source of the metal in the country. During this study Aspergillus humicola SKP102, an indigenous fungus isolated from the mining overburden was employed for the leaching of nickel. About 53.89% of the nickel could be leached by the fungus when grown in batch mode using a Czapek dox medium containing 2% (w/v) of the mining overburden. The parameters affecting bioleaching were optimized in order to grow the fungus and leach the metal. Of the different options of cheap carbon sources, straw infusion and molasses emerged as viable options for the growth of the fungus and the leaching of nickel. Two-step and indirect techniques were also used for this purpose, and they resulted in 53.09% and 65.04% Ni leaching respectively. Adding diluted sulfuric acid to the leaching medium resulted in 97.05% nickel recovery from the overburden pulp. A. humicola SKP102 could be a potential tool for leaching nickel from the mining overburden.
    Źródło:
    Journal of Sustainable Mining; 2016, 15, 3; 108-114
    2300-1364
    2300-3960
    Pojawia się w:
    Journal of Sustainable Mining
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Leaching behaviour of a turkish lateritic ore in the presence of additives
    Autorzy:
    Basturkcu, H.
    Acarkan, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/110446.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    laterite
    nickel
    agitation leaching
    dissolution
    Opis:
    This paper investigates the dissolution mechanism of a lateritic nickel ore from the Caldag Region of Manisa in Turkey. The ore sample contained 1.2% Ni, 24.8% Fe, and 0.062% Co. The optimum leaching conditions were found to be temperature 80 oC, particle size -74 μm, H2SO4 concentration 200 g/dm3, solids ratio (by weight) 10% and leaching duration 8 h. The extractions of 98.2% Ni, 98.6% Fe and Co 98.9% were obtained under these conditions. Additionally, the effects of additional substances such as NaCl, Na2S2O5, Na2SO4, and KCl were investigated in order to decrease the leaching duration. The results showed that the additives accelerated the leaching kinetics and achieved nearly the same nickel and cobalt extractions at the end of 4 h compared to the results obtained after 8 h without the additives. If the additives containing chlorine were used, it was determined that the iron extraction showed no increase, although both the nickel and cobalt extractions increased.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 1; 112-123
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exploitation of spent nickel-metal hydride (Ni-MH) batteries as a source of value-added products
    Autorzy:
    Farghal, Fatma E.
    Abdel-Khalek, Mohamed A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2146864.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    nickel–metal hydride
    batteries
    nickel
    recovery
    cementation
    leaching
    recycling
    Opis:
    Spent Nickel–metal hydride batteries can be sources of valuable metals such as nickel, cobalt, manganese, rare earths and toxic chemicals. The recycling of these materials is necessary from both economic and environmental points of view. In this study the nickel is leached in acid solution followed by precipitation and thermal decomposition or by cementation. The affecting parameters such as acid type and concentration, time, temperature and solid/liquid ratio were investigated. The maximum of leached nickel could be obtained in 3M sulfuric acid at 65°C for 60 min with solid-to-liquid ratio of 30 g L-1. The liquid film is a more suitable model for demonstrating the kinetics of the nickel leaching. Thermal decomposition of the precipitated nickel dimethyl-glyoxime was employed in preparation of nickel oxide. Nickel was separated from aqueous solution by cementation on zinc. The cementation process follows pseudo first-order kinetics and diffusion controlling steps. The yield was 91% of the original nickel content.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 6; 95--101
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Atmospheric pressure leaching of nickel from a low-grade nickel-bearing ore
    Autorzy:
    Javanshir, S.
    Mofrad, Z. H.
    Azargoon, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/110534.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    leaching
    kinetics
    calcination
    laterite ore
    nickel recovery
    Opis:
    This study focused on the extraction of nickel from a low-grade lateritic ore. The characterization of representative samples was done by X-ray diffraction (XRD), X-ray fluorescence (XRF), and microscopic mineralogical studies. Nickel was uniformly distributed in iron (hydr)oxide minerals. The pre-concentration of nickel was attempted by magnetic separation, but was unsuccessful. The effect of the type of lixiviant, acid concentration, S/L ratio, time, and temperature were investigated in the atmospheric leaching process. Based on the experimental data, optimum conditions for the maximum recovery of nickel were determined under the following conditions: 5 M H2SO4, 25% (w/v), 90 ºC, and two hours. Pre-calcination, for increasing nickel extraction by converting goethite to hematite, was carried out on raw ores at different times (30-180 minutes) and temperatures (180-540 ºC). Recovery was found increasing from 69 to 95% under the same conditions. Kinetic studies were conducted by fitting the data with Shrinking Core (SC) models. The study determined, from the estimate of activation energy, that the rate of reaction controlled by chemical reaction.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 3; 890-900
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of chemical and biogenic leaching on surface area and particle size of laterite ore
    Autorzy:
    Pawlowska, A.
    Sadowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/110297.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    nickel
    laterite ores
    leaching
    citric acid
    Aspergillus niger
    Opis:
    Currently there is a decline in the world’s nickel sulfide deposits, which are the main source of this metal. Due to the fact, that more than 70% of nickel reserves are in the form of oxide ores, more attention is nowadays paid on laterites. Leaching processes using different organic acids are widely described in the literature, but there is a lack of works linking influence of leaching process with the surface area and particle size distribution. Therefore, the main aim of this study was to examine how citric acid produced by microorganisms and citric acid added as chemical affected the specific surface and particle size distribution of mineral particles. The laterite ore was obtained from Szklary deposit, Poland. This study also compared the effect of chemical citric acid and filtrate after cultivation of Aspergillus niger on nickel extraction. It was observed that higher nickel recovery correspond to higher surface area of particles. The highest yield of nickel extraction was observed for a citric acid concentration of 1 mol/dm3 (67%). The specific surface area after leaching was 159 m2/g. An analysis of particle size distribution showed increase in the median particle size of particles after leaching with citric acid. It may suggest that dissolution of Polish laterites follows a shrinking core-shrinking particle model.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2017, 53, 2; 869-877
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recovery of cobalt and nickel by atmospheric leaching of flotation sulfide concentrate from lubin concentrator
    Autorzy:
    Gibas, K.
    Borowski, K.
    Chmielewski, T.
    Wejman, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/951849.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    atmospheric leaching
    cobalt
    nickel
    sulphuric acid
    Lubin copper concentrate
    Opis:
    An experimental study on leaching of cobalt and nickel from a Lubin (Poland) sulfide flotation copper concentrate with oxygenated sulphuric acid solution in the presence of iron(III) sulfate is presented. The effect of temperature, iron(III) concentration, initial sulphuric acid concentration, oxygen flow rate and chloride ions addition on cobalt and nickel leaching were examined. The obtained results show, that enhancing investigated leaching parameters increases both the rate and leaching recovery of nickel and cobalt. The effect of iron(III) ions concentration is particularly significant. Additionally, a significant correlation between copper and nickel/cobalt leaching recovery was observed. Due to the fine dissemination of nickel and cobalt, they were leached remarkably faster when copper leaching recovery exceeded 90%.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 1; 191-203
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of silver, nickel and copper cyanides on gold adsorption on activated carbon in cyanide leach solutions
    Autorzy:
    Sayiner, B.
    Acarkan, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/109675.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    gold
    silver
    nickel
    copper
    cyanide leaching
    activated carbon adsorption
    Opis:
    The effect of Ag, Ni and Cu cyanides on gold adsorption on activated coconut carbon in cyanide leach solutions was investigated by synthetic cyanide leach solutions containing gold and other metal cyanides. According to the adsorption tests Ag remarkably reduces the gold adsorption on activated carbon by competing with gold to adsorption sites. When the Ag concentration in solution increases up to 200 ppm the carbon adsorption method for gold recovery becomes inapplicable. Ni has an effect on gold adsorption on activated carbon, however even at as high concentrations of Ni as 250 ppm residual Au in solution is still below 1 ppm. Cu addition up to 300 ppm does not affect the gold loading significantly. According to the adsorption test studies, it is concluded that the metal-cyanides diminish the gold adsorption on activated carbon by adsorbing themselves and competing with gold. When the metals are present in the leach solution all together with gold, they also prevent adsorption of themselves as well as gold. Thus, when Au, Ag, Ni and Cu are present in solution simultaneously, the adsorption of all these metals decreases. The adsorption results were modeled by Fleming k,n adsorption kinetic model.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2014, 50, 1; 277-287
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on leaching kinetics of laterite ore using hydrochloric acid
    Autorzy:
    Li, Jinhui
    Xu, Zhifeng
    Wang, Ruixiang
    Gao, Yang
    Yang, Yang
    Powiązania:
    https://bibliotekanauki.pl/articles/110911.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    nickel laterite
    hydrochloride acid
    kinetics analysis
    hydrometallurgy
    leaching mechanism
    Opis:
    The process of atmosphere-pressure acid leaching of laterites has attracted considerable attention in the nickel industry in recent years. However, the leaching kinetics of laterite using hydrochloride acid has not yet been fully researched. In this paper, the mineral analysis of the ore was carried out, and the leaching mechanism of different minerals at different time was studied comprehensively. The kinetics analysis of the leaching process of nickel, cobalt and manganese showed that the kinetics model of diffusion controlling was suitable and could be described by the linear equation, 1-3(1-a)2/3+2(1-a)=k2t. Based on the linear equation and the Arrhenius equation, the values of activation energy of metal leaching can be deduced (11.56 kJ/mol for nickel, 11.26 kJ/mol for cobalt and 10.77 kJ/mol for manganese). Study of leaching mechanism shows that the order of these minerals dissolution is: goethite, lizardite, magnetite and hematite. Due to the original or product of silica, magnetite, hematite and talc, they can form the solid film which hinders the leaching of valuable metals. Thus, the diffusion controlling step is inner diffusion, namely solid film diffusion controlling.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 3; 711-720
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study of Interaction of Mine Drainage Waters with Impregnated Copper-Nickel Ores
    Badanie interakcji wód drenarskich z impregnowanymi rudami miedzi i niklu
    Autorzy:
    Svetlov, A.
    Makarov, D.
    Potapov, S.
    Nekipelov, D.
    Seleznev, S.
    Parshina, N.
    Masloboev, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/319047.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    ruda miedziowo-niklowa
    woda kopalniana
    ługowanie
    copper-nickel ore
    mine water
    leaching
    Opis:
    The work deals with processes occurring on interaction of mine drainage waters with fine-grain dusty particles, and filtration of the water through sulphide rock mass. The studies have shown that the environmental hazard likely to be caused by the drainage waters of the Severny mining plant of the Kola MMC Ltd is lower than it might be expected owing to precipitating of the heavy metals by iron hydroxides and magnesium hydrosilicates. An assessment of the feasibility of hydrometallurgical processing of impregnated copper-nickel ores has been prepared.
    Praca dotyczy procesów zachodzących w interakcji wód drenażowych kopalnianych z pyłowymi cząstkami drobnoziarnistymi oraz filtracji wody poprzez masy skał siarczkowych. Badania wykazały, że zagrożenie dla środowiska spowodowane przez kwaśny drenaż wody kopalni Severny w Kola MMC Ltd jest niższa niż można się było spodziewać z powodu wytrącenia ciężkich metali za pomocą wodorotlenków żelaza i hydrokrzemianów magnezu. Dokonano oceny wykonalności przeróbki hydrometalurgicznej impregnowanych rud miedzi i niklu.
    Źródło:
    Inżynieria Mineralna; 2018, R. 19, nr 1, 1; 165-171
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Odzysk niklu, kadmu i kobaltu ze zużytych baterii
    Nickel, cadmium and cobalt recovery from spent batteries
    Autorzy:
    Kończyk, J.
    Sobianowska-Turek, A.
    Sobianowska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/103498.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
    Tematy:
    zużyte baterie
    kwaśne ługowanie
    ekstrakcja rozpuszczalnikowa
    nikiel
    kadm
    kobalt
    rezorcyn[4]aren
    spent batteries
    acid leaching
    solvent extraction
    nickel
    cadmium
    cobalt
    resorcin[4]arene
    Opis:
    W pracy zaproponowano czteroetapowy proces odzysku niklu, kadmu i kobaltu ze zużytych baterii niklowo-kadmowych (Ni-Cd) oraz niklowo-wodorkowych (Ni-MH) obejmujący obróbkę mechaniczną, kwaśne ługowanie odpowiednio przygotowanych odpadów bateryjnych, ekstrakcję rozpuszczalnikową badanych metali przy użyciu tetratiofosforylowanego rezorcyn[4]arenu oraz reekstrakcję metali do fazy wodnej. Ponadto, w celu optymalizacji procesu, określono wpływ wybranych parametrów, takich jak: temperatura początkowa i czas prowadzenia ługowania, rodzaj kwasu mineralnego oraz pH fazy wodnej i stężenie ekstrahenta na wydajność i selektywność odzysku badanych metali.
    Presented work describes four-step recovery process of nickel, cadmium and cobalt from Ni-Cd and Ni-MH batteries. The process consists of mechanical treatment, acid leaching, solvent extraction with the use of tetratiophosphorylated resorcin[4]arene and reextraction of the metal ions to aqueous phase. Additionally, in order to optimize the process, effect of some parameters, such as temperature and duration time of the leaching, the type of mineral acid, pH of aqueous phase and extractant concentration on efficiency and selectivity of metal recovery was determined.
    Źródło:
    Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Technika, Informatyka, Inżynieria Bezpieczeństwa; 2016, T. 4; 233-246
    2300-5343
    Pojawia się w:
    Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Technika, Informatyka, Inżynieria Bezpieczeństwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enrichment fractions of trace metals in the five sludges collected from Pomerania
    Wzbogacanie frakcji metali śladowych w osadach filtracyjnych Pomorza
    Autorzy:
    Janukowicz, H.
    Wira, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/84901.pdf
    Data publikacji:
    1999
    Wydawca:
    Akademia Pomorska w Słupsku
    Tematy:
    trace metal
    sludge
    Pomeranian region
    filtration plant
    determination
    aluminium
    silver
    cadmium
    manganese
    zinc
    lead
    copper
    tin
    cobalt
    nickel
    iron
    distribution
    waste water sludge
    leaching technique
    Źródło:
    Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 1999, 03
    1643-0115
    Pojawia się w:
    Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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