磷石膏加压碳酸化转化过程中平衡转化率分析

发布时间：2018-05-11 09:53

本文选题：磷石膏 + 二氧化碳　；参考：《化工学报》2017年03期

【摘要】：围绕磷石膏加压碳酸化转化过程,首先通过实验研究了原料种类对加压碳酸化转化过程的影响,进一步采用Aspen plus流程模拟软件深入分析了各工艺参数对磷石膏加压碳酸化过程平衡转化率的影响规律。结果表明,在加压条件下碳酸化反应均可在5 min时达到平衡,其中分析纯无水硫酸钙更容易完全转化,而二水硫酸钙及磷石膏因含有结晶水或其他杂质,使得其难以完全转化。增大初始氨水浓度、N/S(氨和原料中SO3的摩尔比)以及适量提高反应温度与体系压力,均能有效提高磷石膏加压碳酸化反应平衡转化率。特别是在高温和加压条件下,氨与CO2反应生成的碳酸铵盐可以通过降压闪蒸操作实现其自分解,经吸收返回用于加压碳酸化转化过程,可有效提高氨的利用率,降低硫酸铵生产成本。
[Abstract]:According to the conversion process of phosphogypsum under pressure carbonation, the effect of raw materials on the conversion process was studied. The effect of process parameters on the equilibrium conversion of phosphogypsum carbonation process under pressure was analyzed by Aspen plus process simulation software. The results show that the carbonation reaction can reach equilibrium at 5 min under pressure. The pure anhydrous calcium sulfate is easier to be completely transformed, while calcium dihydrate and phosphogypsum contain crystalline water or other impurities, which makes it difficult to completely transform. The equilibrium conversion rate of phosphogypsum carbonation reaction can be effectively increased by increasing the initial ammonia concentration and the molar ratio of ammonia to SO3 in raw materials, as well as increasing the reaction temperature and system pressure. Especially under the conditions of high temperature and pressure, the ammonium carbonate produced by the reaction of ammonia with CO2 can be decomposed by pressure-flashover operation, and can be used in the process of carbonation conversion under pressure through absorption and return, which can effectively improve the utilization rate of ammonia. Reduce the production cost of ammonium sulfate.
【作者单位】：中国科学院过程工程研究所绿色过程与工程重点实验室;中国科学院过程工程研究所湿法冶金清洁生产技术国家工程实验室;中国科学院过程工程研究所多相复杂系统国家重点实验室;中国科学院大学;
【基金】：国家自然科学基金项目(21300212) 国家“十二五”科技支撑计划项目(2013BAC12B02)~~
【分类号】：TQ177.375

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