Preparation of Ti Rich Materials with Low Ca and Mg by Carbothermal Reduction of Ilmenite
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摘要: 以高钙镁钛铁矿为研究对象,采用碳热还原—浸出工艺在实验室制备低钙镁富钛料。对还原钛铁矿进行XRD物相分析表明,还原钛铁矿中钙元素存在于硅酸盐相,镁与钛元素形成黑钛石固溶体。浸出试验表明,还原钛铁矿采用盐酸浸出,钙元素可被大量浸出;镁元素与钛元素形成固溶体,通过在碳热还原过程中加入硼酸作添加剂,再对还原钛铁矿进行浸出,镁元素的浸出效果得到明显改善,并最终获得CaO为0.13%,MgO为1.12%的低钙镁富钛料。Abstract: Using the ilmenite with high calcium and magnesium as the raw material,titanium rich material with low calcium and magnesium was prepared via carbothermal reduction followed by leaching process in the laboratory.XRD analysis of the reduced ilmenite shows that calcium exists in silicate phases of the reduced ilmenite,and magnesium and titanium form a solid solution of anosovite.The leaching test shows that calcium in the reduced ilmenite can be leached efficiently by hydrochloric acid,with the magnesium remaining in the solid solution.The leaching efficiency of magnesium can be improved significantly by adding boric acid in the carbothermal reduction process.Through the proposed process,titanium rich material with 0.13% of CaO and 1.12% of MgO can be obtained.
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Key words:
- ilmenite /
- carbothermal reduction /
- titanium rich material /
- calcium content /
- magnesium content
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