(中南大學(xué) 冶金與環(huán)境學(xué)院，長沙 410083)
摘 要: 以高砷煙塵堿浸脫砷渣為研究對象，采用硫化鈉浸出-空氣氧化法選擇性提取銻并制備焦銻酸鈉產(chǎn)品。結(jié)果表明：在硫化鈉濃度為100 g/L、氫氧化鈉濃度為40 g/L、反應(yīng)時間為3.0 h、液固質(zhì)量比為5:1、反應(yīng)溫度為90 ℃、攪拌速度為400 r/min條件下，銻的浸出率為84.81 %；在空氣流量為1.5 L/min、反應(yīng)時間為9 h、反應(yīng)溫度為60 ℃、攪拌速度為300 r/min條件下，銻浸出液中銻沉淀率為98.51%；氧化沉淀產(chǎn)物經(jīng)鹽酸溶解、水解、轉(zhuǎn)化后得到焦銻酸鈉產(chǎn)品。硫化鈉浸出-空氣氧化工藝可以有效地分離提取高砷煙塵堿浸渣中的銻，并制備得到焦銻酸鈉產(chǎn)品，實(shí)驗(yàn)過程簡單、清潔，生產(chǎn)成本低，具有產(chǎn)業(yè)化前景。
關(guān)鍵字: 高砷煙塵堿浸渣；硫化鈉浸出；空氣氧化；焦銻酸鈉
（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
