堆浸液中铁循环利用的研究

RECYCLING UTILIZATION OF IRON IN HEAP LEACHING SOLUTION

研究了用软锰矿氧化吸附尾液中 Fe2 + 及把淋洗合格液的中和沉淀铁渣作为氧化剂返回浸出系统的可行性。研究结果表明 ,用粒度 >1 .2 5～ <2 mm、w(Mn O2 )约为 5 0 %的软锰矿 ,在接触时间 8min时 ,氧化 -还原电位可从 3 70 m V提高至 45 0 m V以上 ;在 p H=3 .0～ 3 .5下中和所得铁渣沉降。

The feasibility tests have been conducted,which involve that Fe 2+ containing absorption effluent solution was oxidized by pyrolusite,and neutralizing precipitation iron from eluent.Both the oxidized solution and neutralizing precipitation iron residue were recycled to leaching system as oxidizer.The results showed that the oxidation reducton potential in solution raised from 370 mV to 450 mV,the iron residue could provide high performance for filtrating and subsiding.