含镁铝杂质硫酸氧钛溶液水热水解规律

Rule of hydrothermal hydrolysis of Mg/Al-bearing TiOSO_(4) solution

探究了含镁铝杂质硫酸氧钛溶液[1.0 mol/L TiOSO_(4)+0.5 mol/L MgSO_(4)+0.25 mol/L Al_(2)(SO_(4))_(3)+2.4 mol/L H2SO_(4)]的水热水解规律。热力学计算表明:110~150℃,加入MgSO_(4)和Al_(2)(SO_(4))_(3)的总体效应使钛的理论水解率略有降低[150℃时,纯硫酸氧钛溶液和含镁铝杂质硫酸氧钛溶液的理论水解率分别为99.8%和99.7%,镁铝杂质分别以MgSO_(4(aq))和Al(OH)^(2+)为主];升高温度有利于含钛组分水解,从110℃升高到150℃含镁铝杂质硫酸氧钛溶液的理论水解率由99.1%升高到99.7%。实验结果表明:加入MgSO_(4)和Al_(2)(SO_(4))_(3)后钛水解率略有降低(150℃时,纯硫酸氧钛溶液和含镁铝杂质硫酸氧钛溶液的水解率分别为99.2%和98.3%),升高温度可显著强化含镁铝杂质硫酸氧钛溶液的水解(110℃→150℃,68.6%→98.3%),与热力学计算结果相符。在150℃水热反应10 h,可制得原始粒径为100~300 nm、团聚粒径为1~3μm的不规则状偏钛酸,含钛组分水解率达到98.3%。

The rule of hydrothermal hydrolysis of impurity-bearing titanyl sulfate solution containing[1.0 mol/L TiOSO_(4)+0.5 mol/L MgSO_(4)+0.25 mol/L Al_(2)(SO_(4))_(3)+2.4 mol/L H2SO_(4)]was studied.Thermodynamic analysis indicated that the presence of MgSO_(4) and Al_(2)(SO_(4))_(3)(Mg/Al impurities mainly as MgSO_(4(aq))and Al(OH)^(2+)at 110~150℃)led to the slight decrease of the theoretical hydrolysis ratios of titanium-bearing spices(150℃,99.8%→99.7%),while the increase of temperature favored the hydrolysis of Ti-bearing spices,from 110℃to 150℃leading to the increase of the theoretical hydrolysis ratio of titaniumbearing spices from 99.1%up to 99.7%.The experimental research indicated that the presence of MgSO_(4) and Al_(2)(SO_(4))_(3) led to the slight decrease of the hydrolysis of Ti-bearing spices(150℃,99.2%→98.3%),and the increase of temperature favored the hydrolysis of Ti-bearing spices(110→150℃,68.6%→98.3%),which was in good agreement with the thermodynamic analysis results.The agglomerated metatitanic acid particles(with a particle size of 1~3μm)composed of the small primary particles(with a particle size of 100~300 nm)formed and the corresponding hydrolysis ratio of Ti-bearing spices reached up to 98.3%after treating the impurity-bearing titanyl sulfate solution at 150℃for 10 h.