用针铁矿法从锌焙烧烟尘的热酸浸出液中除铁

Iron Removal from Hot Acid Leaching Solution of Zinc Roasting Dust by Goethite Process

研究了从锌焙烧烟尘常压热酸浸出液中沉淀针铁矿的过程。试验结果表明,反应时间和空气流量对除铁率的影响不显著,而反应温度和溶液终点pH是除铁过程的主要影响因素。在终点pH3.0、反应温度333 K、反应时间2 h、空气流量0.2 m3/min的条件下,除铁率超过99.5%,溶液中铁浓度可由40g/L降至0.1 g/L以下。

Precipitation process of the goethite from hot acid leaching solution of zinc concentrate roast dust was investigated. Experimental results indicated that the effect of reactive time and volume of air flow on the rate of iron removal is not significant, but temperature and final pH of solution are main influence factors for the iron removal process. On the optimum condition of iron precipitation： final pH value is 3.0, 333 K, reactive time is 2 h, air flow is 0.2 m^3/min, the ratio of iron removal exceeds 99.50 % and the concentration of Fe in solution can decrease from 40 g/L to below 0.1 g/L.