| Title |
Leaching Kinetics of Stibnite in Sodium Hydroxide solution - On the Leaching behavior of stibnite ( 3rd Report ) - |
| Authors |
고인용(In Yong KO); 최종수(Jong Soo Choe); 오재현(Jae Hyun Oh) |
| Abstract |
The effects of sodium hydroxide concentration, particle size, temperature and leaching atmosphere have been studied in leaching of stibnite with sodium hydroxide solution. The results in this work are as follows. 1) The extraction rate of antimony from stibnite was enhanced by increasing the temperature and the concentration of sodium hydroxide. 2) The reaction control step is shifted from chemical reaction control in low concentration of sodium hydroxide (below 0.05M) to diffusion control in high concentration (above 0.5M). 3) In case of the chemically controlled reaction, the initial leaching rate can be expressed by the following empirical equation. [d Sb(III)/dt]_(t=0) = k ·(C_(NaOH))³ 4) When the leaching of stibnite with sodium hydroxide was carried out under the oxidizing atmosphere, the higher oxide of antimony is precipitated and this causes the loss of antimony. |