研究了FeCl_3溶液浸取复杂含金硫化精矿中有价金属Cu,Ag,Pb和Zh的过程,考察了主要过程参量对浸取速率的影响.实验数据用非线性回归方法处理,给出动力学模型,说明精矿中Cu的溶解过程由表面化学反应控制,其速率是Fe~(3+)的0.5级和Cl~(-)的零级反应.实验条件下Cu,Ag,Ph和Zn的最终浸取率分别达到96,95,90和91％,超过90％的Fe进入浸取液,总硫的70％以上转化为元素硫,而Au的浸取率则小于3％表明FeCl_3溶液浸取是含Au复杂硫化精矿预处理并回收有价金属的有潜力的方法
A process extracting Cu, Ag, Pb and Zn from a bulk sulphide concentrate withFeCl_3 solutions was investigated. The kinetics of the process and effective parameters wereexamined based on a model of non-reaction shrinking core and an approach of non-linearregression. It was found that the rate of Cu dissolution in the process was controlled by a sur-face reaction which was a half order with respect to Fe~(3+) ions and zero order with respect toCl_-ions. More than 96% Cu, 95% Ag, 90% Pb and 9l% Zn were extracted while over70% sulphide were converted to elemental S and more than 97% of Au were left in theleached residue under the conditions studied. Thus, the leaching process by FeCl_3 and NaClsolution was a more potential technology for pre-treating of Au-bearing sulphide concen-trate and recovery of valuable metals.
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