Papers by Keyword: Pressure Leaching

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Authors: Bao Zhong Ma, Cheng Yan Wang, Wei Jiao Yang, Fei Yin, Yong Qiang Chen
Abstract: A limonitic laterite ore from Indonesea was treated by pressure leaching in H2SO4-Mg(NO3)2 medium, using Mg(NO3)2 as an oxidant. Experiments were conducted in order to determine the optimum conditions by studying various parameters, including Mg(NO3)2/ore mass ratio, initial acidity, reaction temperature, holding time and liquid/solid ratio. Pressure leaching experiments showed that nickel, cobalt and iron extractions were 90.8 %, 91.9 % and 2.1 % after 60 min of leaching at 493 K with 0.06 g/g Mg(NO3)2/ore mass ratio, 140 g/L initial acidity and 2 mL/g liquid/solid ratio.The total decrement of acid consumption was 72 g H2SO4/kg ore in the presence of Mg(NO3)2.
Authors: Ke Qiang Xie, Zhan Liang Yu, Wen Hui Ma, Yang Zhou, Yong Nian Dai
Abstract: In this paper, removal of iron from metallurgical grade silicon with pressure leaching is carried out. We investigated the factors such as the concentration of hydrochloric, particle size of raw material ground, temperature, pressure and reaction time, which influenced on the removal of iron. The results show that the optimum operating conditions for pressure leaching in hydrochloride are: acid concentration 4 mol/L, diameter for raw material less than 50 μm, leaching temperature 160 0C,leaching pressure 2.0 MPa, leaching time 2.0 h. The content of iron residual in MG-Si powder was reduced to about 200 ppmw. The removal efficiency of iron is up to 90.90 %.
Authors: Xiao Hua Yu, Yong Gang Li, Da Jin Yang, Zhe Shi, Ji Kun Wang, Gang Xie
Abstract: A laboratory-scale method for treating bulk concentrate for reclaiming lead and silver was developed utilizing new hydrometallurgical technology as an alternative to the traditional pyrometallurgical processing. The condition experiments of every chief segment in the whole flowsheet have been systematically investigated, and then the whole hydrometallurgical processing flowsheet was determined. The main contents are followed as: Bulk concentrate was treated using pressure leaching in autoclave, the optimal leaching conditions were determined. The elemental sulphur was deprived from the pressure leaching residue using flotation-distillation. Carbonate conversion -silicofluoric acid leaching on flotation gangue containing lead sulfate using hydrometallurgy was carried. And Leaching silver using thiourea from the residue was carried after extracting lead. Through the whole hydrometallurgy flowsheet, the reclaiming of lead and silver was actualized.
Authors: E.B. Khazieva, V.V. Sviridov, S.S. Naboychenko, V.A. Menshchikov
Abstract: This paper describes an investigation of the surfactant influence on zinc sulfide wetting and the pressure leaching of zinc concentrates. For this, a variety of anionic and cationic surfactants with different chemical structures were tested. The methodology for mineral preferential wettability determination via establishing correlation between the spreading coefficients was proposed. It allows determining the surfactant potential efficiency. The influence of contrastively functional reagents on zinc concentrate pressure leaching was reviewed. It is found that simultaneous usage of stabilizers and dispersing agents allows enhancing zinc extraction, eliminating pellet formation at lower reagent consumptions. The beneficial effect of surfactant mixture was seen through the increased zinc sulfide wetting by solution and colloid protection of sulfur particles via solvate-adsorption and structural factor of stabilization. The optimal composition of surfactant mixture was proposed and allowed to extract 95 % of zinc along with pellet formation elimination.
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