从铜冶炼烟气酸洗液中分离富集铼

铜冶炼烟气酸洗液经D296阴离子交换树脂吸附后，再依次采用氨水解吸Sb,NaOH和酒石酸混合溶液解吸Bi,NH₄SCN溶液解吸Re，实现Re/Sb/Bi的分步解吸并获得铼富集液。结果表明：酸洗液电位对Re、Sb、Bi吸附率没有明显影响，适宜的酸洗液H₂SO₄浓度为43.81 g·L^-1,Re、Sb、Bi吸附率分别为100%、6.55%和89.05%;D296树脂吸附Re的穿透容量和饱和容量分别为1.308和1.773 g·L^-1，且树脂利用率为73.77%；先采用12.5%氨水解吸Sb,16%NaOH+140 g·L^-1酒石酸混合溶液解吸Bi，通过添加酒石酸可有效抑制Bi水解，再采用10%NH₄SCN溶液解吸Re，得到铼富集液，其Cu、As、Sb、Bi浓度均降至1 mg·L^-1以下，且使酸洗液中Re富集了4倍。

Separation and enrichment of rhenium from acid washing solutionof copper smelting flue gas

The acid washing solution of copper smelting flue gas was adsorbed by D296 anion exchange resin, and then Sb was desorbed by ammonia, Bi was desorbed by NaOH and tartaric acid mixed solution, and Re was desorbed by NH₄SCN solution. The step-by-step desorption of Re/Sb/Bi was realized and rhenium enrichment solution was obtained. The results show that the potential of acid washing solution has no significant effect on the adsorption rates of Re, Sb and Bi. The appropriate concentration of H₂SO₄ in acid washing solution is about 43 g.L^_-1, and the adsorption rates of Re, Sb and Bi are 100%, 6.55% and 89.05%, respectively. The breakthrough capacity and saturation capacity of D296 resin for adsorption of Re are 1.308 g.L^_-1 and 1.773 g.L^_-1, respectively, and the utilization rate of resin is 73.77%. Firstly, 12.5% ammonia is used to desorb sb, and 16% NaOH + 140 g.L^_-1 tartaric acid mixed solution is used to desorb Bi. The hydrolysis of Bi can be effectively inhibited by adding tartaric acid, and then 10% NH₄SCN solution is used to desorb Re to obtain rhenium enrichment solution. The concentration of Cu, As, Sb and Bi in rhenium enrichment solution decrease to less than 1 mg.L^_-1. Re concentration in acid washing solution is enriched four times.