Development of a new technique for upgrading ilmenite ore utilizing liquid-phase oxidation process

提出并论证了一种利用我国重要的钛矿石之一钛铁矿生产纯二氧化钛的新工艺。TiO2和FeO的混合物在1600 ℃下被碳还原为Ti2O3和Fe。证实了在氢气气氛下，Ti2O3溶解在HCl基酸溶液中。当用空气氧化含有Fe（II）离子和Ti（III）离子的溶液时，TiO 2选择性地沉淀，并且所获得的TiO 2的纯度超过99质量%。这些结果表明，它是可能的，从钛铁矿生产纯二氧化钛的新工艺包括碳热还原钛铁矿为Ti2O3和金属铁，还原后的钛铁矿溶解在酸性溶液中在氢气气氛下，和选择性沉淀二氧化钛通过曝气。

A new production process of pure TiO2 from ilmenite, which is one of the most important titanium ore, was proposed and demonstrated. The mixture of TiO2 and FeO was reduced to Ti2O3 and Fe by carbon at 1600 degree Celsius. It is confirmed that Ti2O3 dissolved in HCl based acid solution under a hydrogen gas atmosphere. When the solution containing Fe(II) ion and Ti(III) ion was oxidized by air, TiO2 selectively precipitated and the purity of the obtained TiO2 was over 99 mass%. These results indicates that it is possible to produce pure TiO2 from ilmenite with the new process consists of carbothermic reduction of ilmenite to Ti2O3 and metallic Fe, dissolution of the reduced ilmenite in acid solution under a hydrogen gas atmosphere, and selective precipitation of TiO2 by aeration.