分银渣中有价金属高效回收利用

以锡、铅及砷含量较高的分银渣为原料, 研究了高效回收锡、铅、砷、锑等有价金属的工艺流程。采用分银渣制团-高温脱砷锑-还原熔炼-硅氟酸电解工艺, 考察了还原剂种类、还原剂加入量以及MeS加入量对高温脱砷锑过程的影响, 结果表明: 当还原剂R1加入量为8.8%, MeS加入量为2.4%时, 高温处理团矿后锡回收率达到87.64%, 脱砷锑效果好。经硅氟酸电解, 锡、铅以铅锡焊料形式回收, 锑以锑氧形式脱除, 银、铋等富集进入阳极泥。

Efficient Recycling of Valuable Metals from Silver Separating Residue

The silver separating residue with high content of tin, lead and arsenic was taken as raw materials in the investigation of technical process of efficiently recycling valuable metals including tin, lead, arsenic and antimony. The effects of the type and addition of reductant as well as the addition of MeS on dearsenication and antimony removal at high temperature were explored with the process consisting of silver separating residue briquetting, dearsenication and antimony removal at high temperature, reduction smelting, and electrolysis in silicofluoric acid. The results showed, with the amount of reductant R1 and MeS accounting for 8.8% and 2.4%, respectively, of silver separating residue, the recovery rate of tin reached 87.64% after agglomerate being treated at high temperature, resulting in an ideal effect in removal of arsenic and antimony. The silver and bismuth can be concentrated into the anode slime through electrolyte in silicofluoric acid system, with tin and lead being recovered in the form of Pb-Sn solders, while antimony removed in the form of antimony oxide.