Production of Rutile TiO2 Pigment from Titanium Slag Obtained by Hydrochloric Acid Leaching of Vanadium-Bearing Titanomagnetite

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• 作者：Longsheng Zhao ; Yahui Liu ; Lina Wang ; Hongxin Zhao ; Desheng Chen ; Binnian Zhong ; Jianchong Wang ; Tao Qi
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：January 8, 2014
• 年：2014
• 卷：53
• 期：1
• 页码：70-77
• 全文大小：483K
• ISSN：1520-5045

文摘

An alternative route was proposed for preparing rutile titanium dioxide (TiO₂) white pigment. The process involves the digestion of titanium slag with sulfuric acid, subsequent hydrolysis of unenriched titanyl sulfate solution with ammonia, low-temperature calcination, and unseeded crystallization, producing a high-quality rutile TiO₂ white pigment. The experimental data indicated that the conversion ratio of dissolved Ti in the unenriched titanyl sulfate solution was highly dependent on the NH₃/TiO₂ molar ratio. Under the optimal conditions, approximately 92.0% of dissolved Ti in the solution could be converted to metatitanic acid (H₂TiO₃) that was then calcined at 850 掳C to form rutile TiO₂ pigment with purity of 98.41% and mean particle diameter of 0.1鈥?.3 渭m. The presence of NH₄⁺ during the hydrolysis improved the stability of the charged H₂TiO₃ particles and blocked further coagulation. The fast phase transformation at relatively low temperature could be attributed to the presence of self-generated rutile nuclei. In addition, the experimental validation for the unseeded precipitation of ferrous ammonia sulfate ((NH₄)₂Fe(SO₄)₂路6H₂O) in the crystallization step was demonstrated.