摘要
我国锌资源储量丰富,含锌矿物中很大一部分以高铁闪锌矿的形式存在,并且其中含有丰富的铟资源。为了综合回收高铁闪锌矿湿法炼锌过程富集于中浸渣中的有价金属,开展了中浸渣和锌精矿的还原酸浸试验研究,其主要目的是利用硫酸浸出中性浸出渣中以铁酸盐形式残留的锌和铟,同时利用锌精矿将溶液中的三价铁还原为二价铁,实现锌精矿中锌、铟的同步浸出。研究了锌中浸渣和锌精矿的投料质量比、浸出剂浓度、液固比、反应温度、浸出时间对锌、铟浸出行为的影响。研究表明在初始硫酸浓度220 g/L,中浸渣与锌精矿质量比1∶0.25,粒度-74μm,液固比6,温度90℃,反应时间3 h的条件下,锌、铟的浸出率在96%以上,浸出液中95%以上的铁被还原为二价铁离子,实现了浸出与还原的同步进行。
China is rich in zinc resource, most of which exist in forms of marmatite bearing indium. In order to recover the valuable metals neutral leaching residues from the process of zinc hydrometallurgy, the testwork of re- duction acid leaching on neutral residue mixed with zinc concentrate with high-iron sphalerite as the research object has been taken in the paper. The primary objectives are to leach the zinc and indium remaining in the neutral leach residue as ferrite, using acid, and to reduce the ferric iron in solution to the ferrous state by reaction with zinc con- centrate, thereby extracting the zinc and indium from the zinc concentrate. The influencing factors such as mass ra- tio of neutral residue to zinc concentrate, initial concentration of sulfuric acid, reaction time, liquid-solid ratio, and temperature on leaching efficiency of zinc and indium have been studied in detail and finally the best technical pa- rameters obtained ： mass ratio of neutral residue to zinc concentrate 1 ： 0.25, material particle size smaller than 74 p,m, initial concentration of sulfuric acid 220 g/L, reaction time 3 h, liquid-solid ratio 6, temperature 90℃. The results showed that the leaching efficiency of zinc and indium were over 96% , besides, nearly 95% Fe was Fe2＋ in the leaching solution that was suitable for subsequent process under the optimal conditions, which effectively ex- tracts zinc and indium and converted Fe3＋ into Fe2＋ in solution.
出处
《矿冶》
CAS
2016年第4期36-40,共5页
Mining And Metallurgy
基金
国家自然科学基金资助(51474117
51564030)
关键词
铁闪锌矿
浸出渣
还原
浸出
锌和铟
marmatite
leaching residue
reduction
leaching
zinc and indium
