用锌焙砂中浸渣制备铁精矿

为综合利用湿法炼锌渣中的铁，进行了用锌焙砂中浸渣制备铁精矿的试验研究。试验在传统湿法炼锌工艺的基础上，将高酸浸出过程改为高温高酸还原浸出过程，使铁以亚铁形式进入溶液，最后用双氧水和碱式碳酸锌沉铁。试验结果表明，采用新工艺可从锌焙砂中浸渣制得含铁大于51%的铁精矿，使最终渣量大大减少，并且对锌和铟的回收率没有影响。

Preparation of Iron Concentrate from Residue of Neutral Leaching of Zinc Calcine

To comprehensively utilize the iron in the slag of wet zinc smelting, test is made on the preparation of iron concentrate from the residue of neutral leaching of zinc calcine. Based on the conventional wet zinc smelting process, the high acid leaching is transformed into high temperature high acid reduction leaching process, making it possible for the iron to enter the solution in the form of ferrous iron, which is then precipitated by hydrogen peroxide and basic zinc carbonate. The test results indicate that the new process can obtain an iron concentrate grading over 51% from the leaching residue of zinc calcine, greatly reducing the final residue amount and meanwhile having no impact on the recovery of both zinc and indium.