摘要
提出并研究盐酸浸出-铁粉置换-硫化沉淀-喷雾热解综合利用窑渣铁精矿的新工艺。结果表明:当盐酸浓度为6 mol/L,浸出温度为60℃时,Ag、Pb、Cu、Fe和Zn的浸出率分别达到99.95%、99.34%、95.07%、89.44%和57.92%。所得盐酸浸出液中加入理论量1.25倍的铁粉,Cu和Ag的脱除率均可达到98%以上。当硫化亚铁用量为理论量的3倍时,铁粉置换后液中Pb、Zn的脱除率可达96%以上,净化后液中杂质总量低于500 mg/L。以硫化沉淀后的液体为原料进行喷雾热解,在温度高于700℃时,可制得平均粒度(D50)为12μm、纯度>99%的类球形Fe_2O_3粉末。利用这一工艺,不仅可高效回收窑渣铁精矿中的有价金属,还可将铁资源转化为具有较高附加值的氧化铁产品,从而实现窑渣铁精矿的综合利用。
A novel process,including hydrochloric acid leaching,iron powder replacing,sulphide precipitation and spray pyrolysis,was proposed to treat iron concentrate recovered from zinc kiln slag for comprehensive utilization.Treated by solution of 6 mol/L hydrochloric acid at 60 ℃,the leaching rates of Ag,Pb,Cu,Fe and Zn reach 99.95%,99.34%,95.07%,89.44% and 57.92%,respectively.More than 98% Cu and Ag are recovered from the leach liquor when stoichiometric ratio of iron powder is 1.25 times of the theoretical value.More than 96% Pb and Zn is removed with three times of theoretical consumption of Fe S,and the concentration of impurities of the final solution is less than 500 mg/L.Fe_2O_3 powder,which is spherical with mean size of 12 um and purity of 99%,is prepared with final solution at above 700 ℃.By this process,not only the metal values can be recovered effectively,but also the iron resources of zinc kiln slag can be converted into Fe_2O_3 with high purity,thus,the comprehensive utilization of iron concentrate recovered from zinc kiln slag can be realized.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2016年第3期673-680,共8页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(51574285
51404307)~~
关键词
湿法炼锌
窑渣
浸出
喷雾热解
硫化沉淀
zinc hydrometallurgy
kiln slag
leaching
spray pyrolysis
sulphide precipitation
