硫酸法钛白粉还原过程的影响因素及机理研究

Study on the Influencing Factors and Mechanism of the Reduction Process of Titanium Dioxide by Sulfuric Acid Method

研究硫酸法钛白粉生产水洗滤饼还原处理过程还原剂加入量、反应浓度、反应温度和反应pH值因素的影响作用。结果表明,增加还原剂铁粉加入量可有效降低Fe_(2)O_(3)含量,在0.12%~0.22%范围内,Fe_(2)O_(3)含量显著减少;反应原料浓度增加会导致Fe_(2)O_(3)含量升高,浓度过高会抑制还原效率;反应温度对还原效果具有显著影响,最佳反应温度为50℃;pH值对还原过程影响显著,较低pH值有利于Fe^(3+)向Fe^(2+)的转换。影响因素影响顺序为:反应pH值>还原剂加入量>反应温度>反应原料浓度。以上结果为实际生产中控制和优化硫酸法钛白粉的还原处理提供参考。

This study investigates the effects of reducing agent dosage,reaction concentration,reaction temperature,and reaction pH on the reduction process of water washed filter cake in the production of titanium dioxide by sulfuric acid method.The results showed that increasing the amount of reducing agent iron powder added can effectively reduce the Fe2O_(3)content,with a significant decrease in Fe2O_(3)content within the range of 0.12% to 0.22%.An increase in the concentration of reactants will lead to an increase in Fe2O_(3)content,and a high concentration will inhibit the reduction efficiency.The reaction temperature has a significant impact on the reduction effect,and the optimal reaction temperature is 50 ℃.The pH value has a significant impact on the reduction process,and a lower pH value is beneficial for the conversion of Fe3+to Fe2+.The order of influencing factors is:reaction pH value>reducing agent dosage>reaction temperature>reaction raw material concentration.The above results provide reference for controlling and optimizing the reduction treatment of sulfuric acid titanium dioxide in actual production.