(中南大学 冶金与环境学院，长沙 410083)
摘 要: 以高砷烟尘碱浸脱砷渣为研究对象，采用硫化钠浸出-空气氧化法选择性提取锑并制备焦锑酸钠产品。结果表明：在硫化钠浓度为100 g/L、氢氧化钠浓度为40 g/L、反应时间为3.0 h、液固质量比为5:1、反应温度为90 ℃、搅拌速度为400 r/min条件下，锑的浸出率为84.81 %；在空气流量为1.5 L/min、反应时间为9 h、反应温度为60 ℃、搅拌速度为300 r/min条件下，锑浸出液中锑沉淀率为98.51%；氧化沉淀产物经盐酸溶解、水解、转化后得到焦锑酸钠产品。硫化钠浸出-空气氧化工艺可以有效地分离提取高砷烟尘碱浸渣中的锑，并制备得到焦锑酸钠产品，实验过程简单、清洁，生产成本低，具有产业化前景。
关键字: 高砷烟尘碱浸渣；硫化钠浸出；空气氧化；焦锑酸钠
（School of Metallurgy and Environment, Central South University, Changsha 410083, China）
Abstract:A promising process, including sodium sulfide leaching and air oxidation, was proposed to prepare sodium pyroantimonate from alkali leaching residue of high arsenic dust. The results show that the leaching efficiency of antimony is 84.81% under the conditions of sodium sulfide concentration 100 g/L, sodium hydroxide concentration 40 g/L, time 3.0 h, mass ratio of liquid to solid 5.0, temperature 90 ℃, stirring speed 400 r/min. The antimony is precipitated from the leaching solution containing antimony. The precipitation efficiency of antimony is 98.51% under the conditions of air flow rate 1.5 L/min, time 3.0 h, temperature 60 ℃, stirring speed 300 r/min. The sodium pyroantimonate is obtained from oxidation precipitation containing antimony by the processes including HCl dissolution, hydrolyzation and conversion. The antimony can be effectively extracted by sodium sulfide leaching from alkali leaching residue of high arsenic dust, and sodium pyroantimonate product can be made by air oxidation. The experimental process is simple, clean and low cost, which is promising for industrialization in the future.
Key words: alkali leaching residue of high arsenic dust; sodium sulfide leaching; air oxidation; sodium pyroantimonate
