Kinetics study of leaching arsenic from Ni-Mo ore roasting in dust mixture of hydrochloric and sulfuric acids
来源期刊：中南大学学报(英文版)2014年第6期
论文作者：HOU Xiao-chuan(侯晓川) YANG Yun-de(杨润德) 李贺 ZENG-li(曾理) XIAO Lian-sheng(肖连生)
文章页码：2176 - 2183
Key words：Ni-Mo ore; roasting dust; arsenic; leaching kinetics
Abstract: The kinetics of leaching arsenic from Ni-Mo ore roasting dust was investigated. The effects including leaching temperature, particle size of the smelter dust, stirring speed, the coef？cient β (the molar ratio of sodium chlorate to arsenic in the smelter dust) and the initial H+ concentration on leaching arsenic were studied. The results indicate that the leaching of arsenic increases sharply with the decrease of particle size. The orders of reaction with respect to H+ concentration and particle size are determinted to be 1.136 and -1.806, respectively. The leaching of arsenic reaches 99% under experimental conditions, the apparent activation energy is determined to be 11.157 kJ/mol, which is consistent with the values of activation energy fordiffusion model. The kinetics equation of leaching arsenic from the roasting dust could be expressed by a semi-empirical equation as
HOU Xiao-chuan(侯晓川)1, 2, YANG Yun-de(杨润德)1, LI He(李贺)1, ZENG-li(曾理)2, XIAO Lian-sheng(肖连生)2
(1. Changsha Research Institute of Mining and Metallurgy, Changsha 410012, China;
2. School of Metallurgy and Environment, Central South University, Changsha 410083, China)
Abstract:The kinetics of leaching arsenic from Ni-Mo ore roasting dust was investigated. The effects including leaching temperature, particle size of the smelter dust, stirring speed, the coef？cient β (the molar ratio of sodium chlorate to arsenic in the smelter dust) and the initial H+ concentration on leaching arsenic were studied. The results indicate that the leaching of arsenic increases sharply with the decrease of particle size. The orders of reaction with respect to H+ concentration and particle size are determinted to be 1.136 and -1.806, respectively. The leaching of arsenic reaches 99% under experimental conditions, the apparent activation energy is determined to be 11.157 kJ/mol, which is consistent with the values of activation energy fordiffusion model. The kinetics equation of leaching arsenic from the roasting dust could be expressed by a semi-empirical equation as
Key words:Ni-Mo ore; roasting dust; arsenic; leaching kinetics
