以饲料级磷酸氢钙制备磷酸二氢钾的工艺研究
发布时间：2018-10-13 16:05
【摘要】：以湿法磷酸制备的饲料级磷酸氢钙为原料,开发工业级磷酸二氢钾的生产工艺。通过加入适量的磷酸提高磷酸氢钙的分解率,研究了磷酸氢钙与磷酸的预分解反应条件及其与硫酸氢钾复分解反应的条件。优化条件:饲料级磷酸氢钙悬浮液的液固比为4 mL/g,磷酸、磷酸氢钙、硫酸氢钾物质的量比为0.3∶1∶1,反应温度为60℃,硫酸氢钾在反应开始的1 h内均匀加入,反应时间为2 h。在此条件下,复分解反应中饲料级磷酸氢钙中的磷收率达到94.5%,硫酸氢钾中的钾收率达到99.9%。研究提出,以磷酸预分解磷酸氢钙以及结晶母液循环的磷酸二氢钾制备工艺,解决了磷和钾收率低以及生产成本高的问题,同时无废液排放。
[Abstract]:The production process of industrial grade potassium dihydrogen phosphate was developed with feed grade calcium bicarbonate prepared by wet phosphoric acid as raw material. By adding proper amount of phosphoric acid to increase the decomposition rate of calcium hydrogen phosphate, the reaction conditions of predecomposition of calcium hydrogen phosphate and phosphoric acid and the condition of double decomposition with potassium hydrogen sulfate were studied. The optimum conditions were as follows: the liquid-solid ratio of feed grade calcium hydrogen phosphate suspension was 4 mL/g, the ratio of potassium hydrogen sulfate to potassium sulfate was 0.3: 1: 1, the reaction temperature was 60 鈩，
本文编号：2269203
[Abstract]:The production process of industrial grade potassium dihydrogen phosphate was developed with feed grade calcium bicarbonate prepared by wet phosphoric acid as raw material. By adding proper amount of phosphoric acid to increase the decomposition rate of calcium hydrogen phosphate, the reaction conditions of predecomposition of calcium hydrogen phosphate and phosphoric acid and the condition of double decomposition with potassium hydrogen sulfate were studied. The optimum conditions were as follows: the liquid-solid ratio of feed grade calcium hydrogen phosphate suspension was 4 mL/g, the ratio of potassium hydrogen sulfate to potassium sulfate was 0.3: 1: 1, the reaction temperature was 60 鈩，
本文编号：2269203
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