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采用微波低温硫酸化焙烧-水浸和针铁矿除铁方法将Zn、Cu等富集到浸出液中,Pb和Ag富集到浸出渣中,使有价金属得到清洁的回收利用.研究了上述工艺中浸出液除铁的优化工艺条件,探究了反应体系的p H值、浸出液单次滴加量、浸出液的铁含量等因素对除铁效果的影响,并采用X射线衍射分析、扫描电子显微镜观察等手段对得到的沉淀渣进行了表征.研究获得的优化实验条件为:以200 m L的0.01 mol·L-1Zn SO4溶液为底液,晶种添加量为20 g·L-1,除铁体系p H值控制在3左右,温度90℃,每隔5 min滴加3 m L水浸液(保持反应体系中铁的浓度<1 g·L-1).在此条件下,除铁后溶液残铁量仅为0.065 g·L-1,去除率可达99.3%,达到了深度除铁效果.除铁过程中,Zn的损失率仅为4.1%.
Zn, Cu and so on were enriched in the leachate by microwave low-temperature sulfated roasting-water immersion and goethite method, and Pb and Ag were enriched to the leached residue, so that valuable metals could be recovered for recycling.Research on the above mentioned The optimum technological conditions of iron removal from the leaching solution in the process were explored. The effects of p H value, single dropping amount of the leachate and the iron content of the leaching solution on iron removal were investigated. X-ray diffraction and scanning electron microscopy Etc. The optimal experimental conditions were as follows: 0.01 mol·L-1Zn SO4 solution of 200 m L was used as the substrate solution, the amount of seed crystal was 20 g · L-1, The system p H value was controlled at about 3, the temperature was 90 ℃, and 3 m L aqueous solution was added dropwise every 5 min (keeping the iron concentration <1 g · L -1 in the reaction system.) In this condition, The residual iron content is only 0.065 g · L-1, the removal rate can reach 99.3%, reaching the depth of iron removal effect. In the iron removal process, the loss rate of Zn is only 4.1%.