Influence and hydrolysis kinetics in titanyl sulfate solution from the sodium hydroxide molten salt method

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• 作者：Weijing Wang ; Desheng Chen ; Jinglong Chu ; Jie Li ; Tianyan Xue ; Lina Wang ; Dong Wang ; Tao Qi
• 关键词：A1. Growth models ; A1. Hydrolysis process ; B1. Minerals ; B1. Sodium sulfate ; B1. Titanyl sulfate solution
• 刊名：Journal of Crystal Growth
• 出版年：2013
• 出版时间：15 October, 2013
• 年：2013
• 卷：381
• 期：Complete
• 页码：153-159
• 全文大小：2170 K

文摘

Hydrated titanium dioxide (HTD) was precipitated by thermal hydrolysis in purified titanyl sulfate solution (TSS) obtained through the sodium hydroxide molten salt clean method. Various factors including the stirring speed and initial concentrations of TiOSO₄, sulfuric acid, and sodium ion were studied. The main influence factors in the hydrolysis process were the initial concentrations of TiOSO₄ and sulfuric acid. Contrary to the ferrous ion, the sodium ion improved the ionic activity of Ti⁴⁺, but did not decrease the crystal size. The Boltzman growth model (x=A₂+(A₁?A₂)/{1+exp[(t?t₀)/dt)]}, which focuses on two main parameters (), fits the hydrolysis process well with R²>0.97. An increase in sulfuric acid concentration negatively affected the hydrolysis rates and the value of A₂, while t₀ increased. An increase in titanyl sulfate concentration directly reduced the hydrolysis rates and particle size of HTD, contrary to the trend for the value of t₀. A simulation software called 1stopt was used to observe the relationship between Z (A₁, A₂, t₀, dt) and a, b ().