(中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 研究Me(Ⅱ)-NH4Cl-NH3-H2O(MACA)體系處理蘭坪低品位氧化鋅礦的浸出過程，提出用循環(huán)浸出方法富集浸出液中鋅濃度的工藝技術(shù)方案。結(jié)果表明：循環(huán)浸出的優(yōu)化條件為液固比4:1、常溫、攪拌速度300 r/min、浸出時(shí)間3 h；通過循環(huán)次數(shù)分別為14、15及10的3個(gè)階段的循環(huán)浸出試驗(yàn)，獲得渣計(jì)鋅浸出率≥69%、浸出液鋅濃度≥33 g/L的較好結(jié)果。該工藝具有流程簡短、能耗低、凈化容易、環(huán)境友好等優(yōu)點(diǎn)，對(duì)低品位高堿性脈石難選氧化鋅礦的開發(fā)利用具有重要意義。
關(guān)鍵字: 鋅冶金； 低品位氧化鋅礦； MACA體系； 循環(huán)浸出
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The leaching processes of the low grade zinc oxide ores from Lanping in the system of Me(Ⅱ)-NH4Cl-NH3-H2O(MACA) were studied. The technical process of enriching the concentration of zinc in lixivium by cycle leaching was proposed. The results show that the optimal conditions are found, including the ratio of liquid to solid to be 4, stirring speed to be 300 r/min, leaching time to be 3 h and at ambient temperature. Three-stage experiments of cycle leaching were carried out, and the results indicated that the zinc-leaching rate is more than 69% and the zinc concentration of leaching solution is more than 33 g/L. This process has lots of advantages, including a simple flow sheet, low energy consumption, easy purification, being environment-friendly and so on. Therefore, it is to be significant in exploitation and utilization of low-grade zinc oxide ores, which contain high-alkaline gangues and are also difficultly treated by beneficiation.
Key words: zinc metallurgy; low grade zinc oxide ores; MACA system; cycle leaching
