Kinetics of Alkaline Leaching Process of Extractiing Silicon from the Residue of Titanium Extraction with Ammonium Sulfate Roasting
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摘要:
硫酸铵焙烧钛渣提钛后的滤渣中含有大量的硅,本文分析了碱浸提钛渣提硅的动力学反应过程,结果表明:该碱浸过程受克-金-布产物层固膜扩散控制,根据阿罗尼乌斯方程得到反应的表观活化能为28.91 kJ/mol,确定动力学方程式为:1+2(1-x)-3(1-x)2/3=4.8554exp[-28910/( RT)]•t。
Abstract:There is a large amount of silicon in the filter residue after extracting titanium from the titanium slag roasted with ammonium sulfate. Kinetics of alkaline leaching process of extracting silicon from the residue of titanium extraction were investigated. The results show that the internal diffusion on the solid product layer is the rate-controlling step in the leaching process. According to the Arrhenius expression, the apparent activation energy for the alkaline leaching process is 28.91 kJ/mol. The kinetics equation can be expressed as 1+2(1-x)-3(1-x)2/3=4.8554exp[-28910/(RT)]•t.
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Key words:
- Ammonium sulfate /
- Titanium slag /
- Silicon dioxide /
- Alkaline leaching kinetics
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表 1 滤渣的主要化学组成 /%
Table 1. Chemical compositions of the residue
TiO2 Al2O3 Fe2O3 SiO2 MgO CaO 11.24 10.15 1.76 54.60 3.76 12.47 表 2 不同温度下的浸出速率常数
Table 2. Rate constant values at different temperatures
T /K k /min-1 r 443 0.0013 0.9852 463 0.0023 0.9888 483 0.0036 0.975 -
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