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研究了钠化钛渣加碱焙烧过程的反应动力学、焙烧反应控制步骤,探讨了反应温度、碱渣质量比、钛渣粒度对TiO_2提取率的影响。试验结果表明:在适宜条件下,TiO_2提取率为92%,烧渣TiO_2品位达98.68%;钛渣焙烧优化工艺条件为焙烧温度900℃,碱渣质量比4∶6,钛渣粒度-200目,焙烧时间60min;扩散与化学反应的混合控制作用是影响钛渣焙烧效果的最主要因素,焙烧反应符合收缩未反应核模型,表观活化能为57.39kJ/mol,焙烧动力学方程可描述为1+2(1-x)-3(1-x)~(2/3)=3.532 3exp(-57 390/(RT))·t。
The reaction kinetics and calcination reaction control steps of sodium titanate slag with alkali roasting were studied. The effects of reaction temperature, mass ratio of alkaline slag and particle size of titanium slag on the extraction rate of TiO_2 were discussed. The results showed that under the proper conditions, the extraction rate of TiO_2 was 92% and the grade of TiO_2 was 98.68%. The optimal conditions for the calcination of titanium slag were roasting temperature 900 ℃, mass ratio of alkaline slag 4: 6, particle size -200 mesh , And the calcination time is 60 min. The mixing control effect of diffusion and chemical reaction is the most important factor affecting the calcination of titanium slag. The calcination reaction accords with the contracted and unreacted nuclear model, and the apparent activation energy is 57.39 kJ / mol. The calcination kinetics equation can be described as 1 + 2 (1-x) -3 (1-x) ~ (2/3) = 3.532 3exp (-57 390 / (RT)) · t.