盐酸浸出-喷雾热分解法被认为是高效清洁回收湿法炼锌窑渣铁精矿中有价金属的新方法.系统研究了Ag、Pb、Cu、Fe、As、Zn、Si等元素在浸出过程中的行为.结果表明:采用6 mol/L HCl溶液,在液固比10:1、温度60℃、浸出120 min的条件下,Ag、Pb、Cu、Fe、As、Zn的浸出率分别为99.91%、99.25%、95.12%、90.15%、87.58%和58.15%.浸出过程中硅达到饱和,从溶液中析出无定型SiO2,由于其对溶液中的金属离子产生吸附作用,从而对窑渣铁精矿中有价金属的浸出产生不利影响,所以控制SiO2的析出对浸出过程至关重要.
It is taken as a novel prospective process to treat iron concentrate from hydrometallurgical zinc kiln slag for comprehensive utilization of valuable metals by a hydrochloric acid leaching-spray pyrolysis method. The leaching mechanism of different valuable metals was studied. The results revealed that the leaching rates of Ag, Pb, Cu, Fe, As and Zn were 99.91%, 99.25%, 95.12%, 90.15%, 87.58% and 58.15%, respectively with 6 mol/L HCl and L/S ratio of 10:1 at 60 ℃ for 120 min. The action of SiO2 in leaching solution was also studied. The results showed that the precipitation and settlement of SiO2(amorphous) adsorbed part of metal ions in solution, which greatly inhibited the leaching of Cu, Fe, As and Zn, so it is crucial to control the precipitation of amorphous SiO2.
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