(1. 中南大學(xué) 冶金與環(huán)境學(xué)院，長沙 410083；2. 湖南工業(yè)大學(xué) 冶金工程學(xué)院，株洲 412000；
3. 江西省新干縣金山化工廠，新干 331308)
摘 要: 以云南蘭坪低品位氧化鋅礦及其循環(huán)浸出渣的浮選精礦為原料，常溫常壓下在MACA(金屬氨絡(luò)合物)體系中進(jìn)行循環(huán)浸出。浸出液先凈化除砷和銻、再兩段鋅粉逆流置換深度凈化，兩次凈化后液電積制取電解鋅。考察工藝中循環(huán)浸出率、凈化率、物質(zhì)平衡以及電解鋅質(zhì)量和電耗等技術(shù)經(jīng)濟(jì)指標(biāo)。結(jié)果表明：先用MACA法處理原礦粉，再浮選硫化鋅的選-冶結(jié)合流程是合適的蘭坪低品位氧化鋅礦的處理方案，原礦鋅的平均浸出率為70.48%，其氨可溶鋅浸出率達(dá)到89.14%，浮選精礦鋅的浸出率為79.75%，雜質(zhì)元素的凈化率達(dá)到95%，電解鋅純度達(dá)到99.98%，電流效率可達(dá)97.02%。
關(guān)鍵字: 低品位鋅礦；Zn；浮選精礦；電沉積；MACA體系；循環(huán)浸出
（1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. School of Metallurgical Engineering, Hunan University of Technology, Zhuzhou 412000, China;
3. Xingan Jinshan Chemical Plant of Jiangxi Province, Xingan 331308, China）
Abstract:The low grade zinc oxide ores from Lanping in Yunnan Province were treated through cycle leaching in MACA(Metal-ammonium-chloride-ammonia) system at room temperature and pressure. The residue was recovered by flotation and leached in the MACA solution subsequently. The leaching solution was electrodeposited after removal of As and Sb and then deeply purified through two-stage countercurrent of zinc replacement. The technical and economic target, such as cycle leaching rate, removal rate, materials balance, electric zinc quality and power consumption, were investigated. The results show that the combined method of flotation-metallurgy is a suitable process for treating low-grade zinc oxide from Lanping. The average zinc leaching rates for raw ores, ammonia soluble zinc and flotation concentrate are 70.48%, 89.14% and 79.75%, respectively. The purification rate and current efficiency are up to 95% and 97.02%, respectively. Electrolytic zinc with purity of 99.98%Zn is manufactured.
Key words: low grade zinc oxide ores; Zn; flotation concentrate; electrowinning; MACA system; cycle leaching
