通过共沉淀和磁选从绿矾中回收磁铁矿。在共沉淀阶段，研究反应条件对铁回收的影响，确定最佳反应参数如下：n(CaO)/n(Fe2+)1.4：1、反应温度80°C、亚铁离子浓度0.4 mol/L、反应终点溶液中Fe3+/Fe2+摩尔比1.9~2.1。在磁选阶段，研究球磨时间和磁感应强度对铁回收的影响。球磨可以破坏混合产物中磁铁矿的包裹和夹杂行为。结果发现，混合产物球磨20 min 后，磁选精矿的铁品位和铁回收率分别从51.41%和84.15%提高到62.05%和85.35%。
Magnetite concentrate was recovered from ferrous sulphate by co-precipitation and magnetic separation. In co-precipitation process, the effects ofreactionconditionson iron recovery were studied, and theoptimalreaction parameters are proposed as follows:n(CaO)/n(Fe2+) 1.4:1, reaction temperature 80°C, ferrous ion concentration 0.4 mol/L, and the final mole ratio of Fe3+toFe2+in the reaction solution 1.9?2.1. In magnetic separation process, the effects of milling time andmagnetic induction intensity on iron recovery were investigated. Wet milling played an important part in breaking the encapsulated magnetic phases. The results showedthat the mixed product was wet-milled for 20 min before magnetic separation, the grade and recovery rate of iron in magnetite concentrate were increased from 51.41% and 84.15% to 62.05% and 85.35%, respectively.
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