黄铵铁矾法脱除高铁氧化锰矿浸出液中的铁

Removing ferric iron from leaching solution of iron rich manganese oxide ores via ammonium jarosite process

针对高铁氧化锰矿浸出过程中铁含量较高的问题,采用葡萄糖—铁粉在硫酸溶液中耦合还原浸出高铁氧化锰矿获得浸出液,再用黄铵铁矾法脱除浸出液中的铁离子,实现锰铁的有效分离。采用正交和单因素实验考察初始p H、反应温度、反应时间和硫酸铵加入量对浸出液中铁脱除率的影响。结果表明,初始p H值对浸出液中铁的脱除率影响最大,提高初始p H值和温度可以较大幅度提高铁离子脱除率,且沉矾过程能有效脱除浸出液中大量的有机物及Ca2+、Mg2+和K+等离子。黄铵铁矾法脱除浸出液中的铁离子的最佳工艺条件为:初始p H=3,反应温度95℃,反应时间1 h,铁离子脱除率达96.32%。

According to the high content of ferric iron in the leaching process of iron rich manganese oxide ores, the leaching solution of iron rich manganese oxide ores was reduced using glucose-iron powder as coupled reductant in sulphuric acid-water system. Then, ferric iron was removed from the solution using ammonium jarosite process. Orthogonal and single factor experiments were employed to investigate the effects of the initial pH, reaction temperature, reaction time, and （ NH4 ） 2 SO4 dos-age on the iron removal rate. The results showed that the initial pH had a great effect on the jarosite process. The iron removal rate was raised substantially by the increase of initial pH and tempera-ture. A lot of organic matter and Ca^2＋, Mg^2＋ and K^＋ ions also could be effectively removed by jaro-site process. The optimum condition was as follow：initial pH =3, reaction temperature 95 ℃, re-action time 1 h. Under the condition, the iron removal rate of was 96. 32%.