Leaching of Titanium and Silicon from Low-Grade Titanium Slag Using Hydrochloric Acid Leaching |
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Authors: | Longsheng Zhao Lina Wang Tao Qi Desheng Chen Hongxin Zhao Yahui Liu Weijing Wang |
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Affiliation: | 1.National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering,Chinese Academy of Sciences,Beijing,China;2.National Engineering Research Center for Rare Earth Materials,General Research Institute for Nonferrous Metals,Beijing,China;3.Grirem Advanced Materials Co. Ltd.,Beijing,China |
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Abstract: | Acid-leaching behaviors of the titanium slag obtained by selective reduction of vanadium-bearing titanomagnetite concentrates were investigated. It was found that the optimal leaching of titanium and silicon were 0.7% and 1.5%, respectively. The titanium and silicon in the titanium slag were firstly dissolved in the acidic solution to form TiO2+ and silica sol, and then rapidly reprecipitated, forming hydrochloric acid (HCl) leach residue. Most of the silicon presented in the HCl leach residue as floccules-like silica gel, while most of the titanium was distributed in the nano-sized rod-like clusters with crystallite refinement and intracrystalline defects, and, as such, 94.3% of the silicon was leached from the HCl leach residue by alkaline desilication, and 96.5% of the titanium in the titanium-rich material with some rutile structure was then digested by the concentrated sulfuric acid. This provides an alternative route for the comprehensive utilization of titanium and silicon in titanium slag. |
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