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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 2    April 2002

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Influence of mechanical activation on
leaching kinetics of arsenopyrite
ZHAO Zhong-wei(赵中伟), LI Hong-gui(李洪桂),
SUN Pei-mei(孙培梅), LI Yun-jiao(李运姣),
LIU Mao-sheng(刘茂盛), HUO Guang-sheng(霍广生)

Department of Metallurgical Science and Engineering,
Central South University, Changsha 410083,China

Abstract:T, he influence of mechanical activation on the leaching kinetics of arsenopyrite was studied using a planetary centrifugal mill. It shows that mechanical activat ion can enhance the leaching process of arsenopyrite in a nitric-sulfate acidic solution. The leaching ratio within 20min leaching time can increase from 2% to 80%~100%; 10 and 20 minutes' activation ca n depress the apparent activation energy of leaching reaction from 54.5kJ/mol to 39.0kJ/mol and 34.0kJ/mol, respectively. This means that the leaching reaction becomes little dependent on temperature, and arsenopyrite can change from refractory to flexible one; mechanical activation also increases the interplanar distance between crystal faces. The displacement of atoms from its equilibrium position indicates the increase in inner energy.

 

Key words: mechanical activation; mechanochemistry; arsenopyrite; leaching; kinetics

ISSN 1672-7029
CN 43-1423/U

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