Study on Reducing the Loss of Titanium Liquid Entrained in Ferrous Sulfate Filter Cake
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摘要: 采用试验研究和硫酸法钛白工业生产实际相结合的技术路线,测定了硫酸亚铁在水中的溶解度,探究了硫酸亚铁的结晶动力学特性,考察了晶体粒径对滤饼中钛液含量的影响。对钛白行业现行的硫酸亚铁真空绝热冷却间歇结晶过程在添加晶种的条件下进行数学模拟和过程预测,获得了系统绝压、结晶温度、降温速率、蒸发速率的工作方程式。整个结晶过程不产生新的晶核,实现晶体快速长大,受控结晶的晶体粒径比现行工艺增加3.8倍,滤饼夹带钛液的量减少48%,有效地减少了钛液流失。Abstract: Adopting the technical route of experimental research combined with the industrial production,this paper determined the solubility of ferrous sulfate in water to explore its crystallization kinetics characteristics and investigate the filter cake liquid content with different crystal sizes.Simulation and prediction for the ferrous sulfate crystallization via the current vacuum adiabatic cooling batch crystallization process with seed crystal added were carried out,and the working equations of systematic vacuum degree,crystallization temperature,cooling rate and evaporation rate were obtained.The whole crystallization process does not produce new crystal nuclei,realizing the rapid growth of crystals.The crystal size of controlled crystallization is increased by 3.8 times than that of the current process.The amount of titanium liquid entrained in the filter cake is reduced by 48%,which effectively reduces the loss of titanium liquid.
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