Analysis and Calculation on Recycling of the Sulfuric Acid Waste from Sulfate Titanium Dioxide Production
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摘要: 以钛白废酸循环利用为主线，分析了硫酸在硫酸法钛白生产中的物料平衡情况，计算了不同浓度硫酸代替稀释水稀释酸解反应物释放的热量对反应体系温度的影响，分析计算了50%稀硫酸100%返回硫酸法钛白循环利用的条件。结果表明：在无外热供给的条件下，要实现浓缩废酸100%循环利用，钛铁矿酸解用废酸最高浓度为50%，反应酸浓度小于等于81%。Abstract: To investigate recycling of sulfuric acid waste from titanium dioxide production,the material balance of sulfuric acid during production was analyzed and the effect of heat released from acidolysis reactants diluted with concentrated sulfuric acids instead of water on the temperature of the reaction system was also calculated.Finally,conditions to achieve a 100% recycled use of the 50% concentrated sulfuric acid in sulfate TiO2 production were discussed.The results indicated that the minimum concentration of the spent acid for acidulation of ilmenite was 50% and the acid concentration for reaction should be no more than 81% to achieve a 100% recycled use of concentrated acid waste without external heat supply.
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