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kinetics and the conversion rate. And sulfur can be successfully separated from the zinc sulfide concentrate as elemental sulfur. The reasonable experiment parameters are obtained as follows: the leaching... less than 44 μm. Under the optimum conditions, the leaching rate of the zinc can reach 95% and the reduction rate of the sulfur can reach 90%. Key words: zinc sulfide concentrate; pressure acid......
, indicating that the leaching rate of Li was controlled by the chemical reaction and inner diffusion at the beginning of leaching (0-30 min) as a calculated apparent activation energy (Ea) of 20.62 kJ/mol. The inner diffusion became the rate-limiting step as the leaching continues (60-180 min). Moreover, effects of HF/ore ratio and leaching temperature on selective leaching behavior of Li, Al and Si......
on the vanadium leaching percent, such as reagent concentration, ratio of liquid to solid, temperature, leaching time, mineral granularity, were investigated. The results show that the vanadium leaching rate... acid concentration of 30 g/L, sodium hypochlorite dosage of 1.5%, ratio of liquid to solid of 6:1, stirring velocity of 500 r/min at 90 ℃ for 6 h, the leaching rate of vanadium is above 85%. Key......
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leaching rate of spent catalyst saturated with zinc acetate ZHANG Zheng-yong, ZHANG Ze-biao, PENG Jin-hui, QU Wen-wen, HUANG Meng-yang, ZHANG Shi-min (Faculty of Materials and Metallurgical... was developed and the temperature-rising curves of catalyst was measured under microwave irradiation. The influence of microwave pretreatment temperature and microwave irradiation time on the leaching rate......
are respectively 90.9% and 80.2%, and the leaching rate of Fe is only 9.9%. Consequently, Ni and Co can be effectively separated from Fe.Key words:laterite; nickel; cobalt; corrosion process; leaching... by corrosion process was studied using the laterite processed by chloridizing segregation process as starting materials. The effects of mass ratio of acid to ore, air flux, leaching temperature......
Behavior of silver and lead in selective chlorination leaching process of gold-antimony alloy LIU Wei-feng(刘伟锋), YANG Tian-zu(杨天足), XIA Xing(夏 星) School of Metallurgical Science...; Abstract: The behavior of silver and lead in the selective chlorination leaching process of gold-antimony......
for the bio-electro-generative leaching was set up. The effects of grain size and temperature on rate of zinc extraction from sphalerite under the conditions of presence and absence... rate can be decreased by A. ferrooxidans. SEM was used to study the effect of A. ferrooxidans on the ores in the simultaneous electro-generative leaching, which indicates that the produced sulfur......
, the leaching rate is considerably improved [9]. Therefore, it is important to investigate the mechanism of oxygen pressure leaching of sphalerite catalyzed by Fe3+/Fe2+ self-precipitation. The ongoing research...; (7) where α is the Zn leaching ratio, %; K is the integrated rate constant; k1 is the chemical......
and the liquid-to-solid ratio on the leaching rate of zinc were studied by single factor and orthogonal experiments. The maximum difference of leaching rate between zinc and iron, 89.85%, was obtained... in the experiments. 2.3 Procedure The effects of sulfuric acid concentration, temperature, leaching time and liquid-to-solid ratio on the leaching rate of zinc were investigated. The orthogonal experiments were......
