从竖罐炼锌蒸馏残渣旋涡炉处理烟化渣中浮选回收银

Silver Flotation from Vortex Furnace Fuming Slag of Zinc Vertical Distilling Residue

由于竖罐蒸馏炼锌工艺中锌精矿所含的银几乎全部进入蒸馏残渣,因此以蒸馏残渣经旋涡炉烟化处理后得到的烟化渣为原料,开展了浮选回收银的研究.浮选实验考查了浮选过程pH值、温度、捕收剂用量、起泡剂用量对粗选过程的影响.在优化的粗选工艺参数条件下进行了多级开路浮选和闭路浮选实验,最终确定采用一粗四精三扫工艺,捕收剂用量800 g·t-1,起泡剂用量350 g·t-1,获得银精矿品位6 100 g·t-1,银回收率86.10%.

In vertical distilling zinc process, the silver bearing in the zinc concentrate feed primarily remained in the distilling residue. The recovery of silver by flotation from the vortex furnace fuming slag of the distilling residue was investigated. The main parameters including pulp pH, temperature, dosage of the collector and frother which affected the rougher flotation performance were studied. Under the optimized roughing parameters, multistage open circuit and close circuit flotation tests were conducted. Best results were obtained using one-stage roughing, four-stage cleaning, and three-stage scavenging and the dosage of the collector and frother was 800 g.t^-1 and 350 g.t^-1, respectively. The grade of the final silver concentrate was 6 100 g.t^-1 with the silver recovery of 86.10%.