回收铜阳极泥冶炼渣中铑的研究

Study on rhodium recovery from smelting slag of copper anode slime

铜阳极泥冶炼渣是重要的铑资源,采用火法富集和湿法提取相结合的工艺对铜阳极泥冶炼渣中的铑进行回收利用,考察了火法富集过程中各种因素对富集效果的影响。结果表明:在PbO加入量为铜阳极泥冶炼渣的1.1倍(以质量计,下同)、B_(2)O_(3)加入量为铜阳极泥冶炼渣的1.1倍、Na_(2)CO_(3)加入量为铜阳极泥冶炼渣0.9倍、熔炼温度1 200℃,熔炼时间2 h的条件下,形成的铅合金中Rh含量达到7 536.4 g/t,富集6.2倍;在银粉加入量为铅合金的1倍、灰吹温度1 300℃、灰吹时间2.5 h条件下进行铅合金灰吹除杂富集,形成的银合金中Rh含量达到42 208.1 g/t,富集35.7倍;在浸出温度60℃、浸出时间1.5 h、浸出液固比为10∶1的条件下进行湿法提取,生产的铑粉纯度为91.2%,实现了铑二次资源综合回收。

The copper anode mud smelting slag was an important rhodium resource. The rhodium in copper anode mud smelting slag was recovered by fire enrichment and wet extraction. The effects of various factors on the enrichment were investigated.Under the conditions of the addition of PbO 1.1 times wt. of smelting slag, the addition of B_(2)O_(3)1.1 times, the addition of Na_(2)CO_(3) 0.9 times, 1 200 ℃ and 2 h melting time, the Rh content of lead alloy was 7 536.4 g/t, and the enrichment times was 6.2;under the conditions that addition of silver was 1 time wt. of lead alloy, the ash blowing temperature was 1 300 ℃, and the ash blowing time was 2.5 h, the Rh content of silver alloy was 42 208.1 g/t, and the enrichment times was 35.7;under the conditions of leaching temperature 60 ℃, leaching time 1.5 h and leaching liquid-solid ratio of 10∶1, the purity of rhodium powder was 91.2%, and comprehensive recovery of rhodium secondary resources was realized.