발간논문

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Vol.19, No.5, 410 ~ 418, 1981
Title
Leaching Kinetics of Stibnite in Ferric Chloride Solution - On the leaching behavior of Stibnite ( 2nd Report ) -
고인용In Yong Ko, 김동진Dong Jin Kim, 오재현Jae Hyun Oh
Abstract
A study on the leaching of stibnite was carried out in acidified ferric chloride solution at temperature ranging from 30℃ to 90℃. Possible leaching mechanism for the reaction was discussed with the experimental kinetic data obtained in this investigation. To evaluate the rate equation satisfying the data of the reaction, various kinetic models were discussed. The results obtained in this work are as follows; 1) The leaching rate of stibnite was enhanced by increasing the temperature and the concentration of solvent, and by making the particle size smaller. 2) In case of fine particle finer than 270 mesh, the leaching reaction is controlled by the diffusion of reactant (Fe(III)) through sulfur layer. The leaching reaction of coarse particle coarser than 270 mesh is controlled by chemical reaction in early stage and shift to diffusion controlled reaction according as the reaction progresses. 3) The apparent activation energy for pore diffusion reaction is 17 ㎉/㏖. 4) The initial leaching rate of 270/325 mesh stibnite can be expressed by the following empirical equation, d[Sb(III)]/dt = k ·[Fe(III)]^0.3 ·[HCl]^0.6
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