煤金团聚法回收金机理初探

介绍了煤金团聚法（Coal Cold Agglomeration，CGA）的研究现状，讨论了影响煤金油团聚的几个主要因素，如煤化学、中性油的特性、疏水颗粒间的相互作用等。在此基础上，研究搅拌强度和接触时间对CGA金回收动力学的影响，发现在其他条件不变的情况下，同一矿种在不同的搅拌速度下，金回收动力学速率常数是一定的。筛选出的煤、油混合的聚团很好的无捕收剂捕金能力，金回收率可达77％～86％。进一步实验研究发现添加适量的硫化钠调整剂对含硫化物原生金矿中金有较好的活化作用，金回收率有显著提高，而硫化物的上浮却有所降低。

Recovering of copper with metallic aluminum

The cementation of copper ions from aqueous copper sulfate solutions by using spherical aluminum metal particles was examined. The effects of the experimental parameters on copper cementation were investigated and evaluated. Reaction rate increases with increasing copper concentration, reaction temperature, stirring speed and decreasing pH. It was observed that the reaction follows the first-order kinetics, and progresses according to the diffusion controlling step.