从闪速还原锌焙砂中选择性浸出锌、铁试验研究

Selective Acid Leaching of Zinc and Iron From Flash Reduction Zinc Calcine

研究了从锌焙砂闪速还原焙烧产物中选择性酸浸锌,考察了初始硫酸质量浓度、浸出温度、浸出时间、液固体积质量比、搅拌速度对锌、铁浸出率的影响。试验结果表明:还原锌焙砂的锌浸出率较锌焙砂的锌浸出率提高10%以上,其浸出渣中含铁质量分数提高7%以上;还原锌焙砂结构疏松多孔,使其及浸出渣的过滤性能得以改善。高效分解锌焙砂中ZnFe2O4并形成理想形态的磁性化合物Fe3O4,是提高还原锌焙砂锌浸出率并抑制铁浸出从而实现锌、铁有效分离的关键。

Selective acid leaching of zinc and iron from flash reduction roasting product was studied. The influence of initial sulfuric acid concentration, leaching temperature, leaching time, the ratio between liquid volume and solid mass, stirring rate on leaching of zinc and iron were studied. The results show that the leaching rate of zinc increases more than 10% after zinc calcine being reduction roasted, iron content in the leaching residue increases more than 7 %. The leaching as well as filtering performance are improved due to the porous structure of reduction zinc calcine. The formation of the desired magnetic compound Fe3 O4 by efficient decomposition of ZnFezO4 in zinc calcine is effective to separate zinc and iron.