提高锌浸出渣中银浮选回收率的研究

某湿法炼锌厂低酸度锌浸出渣中53.8%的银存在于难完全回收的闪锌矿上,其回收是提高浮选回收率的关键。经对比浮选和正交试验获得了浮选粗选最佳药剂制度,捕收剂为丁铵黑药(900g/t)和Z-200(50 g/t),载体活性炭(2000 g/t),起泡剂2#油(100 g/t)。一粗一精一扫开路试验表明,在非强充气和非强搅拌条件下,浮选精矿银品位为8210 g/t,较现有工艺(3000 g/t)大幅提高;银回收率为64.7%,与现有工艺(60%~64%)相当。

Study on Improving Silver Flotation Recovery from Zinc-leached Residues

For zinc-leached residues of some zinc hydrometallurgy factory, there is 53.8% silver in sphalerite which is difficult to recover completely. The improvement of recovery of silver in sphalerite is critical to the silver flotation recovery rate. The optimum reagent system of silver flotation has been obtained by contrast flotation and orthogonal tests, consisting of ammonium dibutyl dithiophosphate (900 g/t) and Z-200 (50 g/t) as collectors, active carbon as carriers (2000 g/t), and 2^# oil (100 g/t) as foaming agent. Using one rough flotation, one scavenger and one concentrating processes, the silver grade of concentrate was improved to 8210 g/t from 3000 g/t by existing process. The silver recovery rate reached to 64.7% which is equivalent to the existing process(60%~64%).