磷酸氢钙生产磷酸二氢钾的工艺研究

介绍了磷酸氢钙和硫酸氢钾制磷酸二氢钾的新工艺。采用单因素实验,研究了反应过程中磷酸氢钙与硫酸氢钾的物质的量比、反应温度、液固比以及反应时间的影响，得到适宜的工艺条件为：磷酸氢钙与硫酸氢钾物质的量比为0.8 ∶1、反应温度为70 ℃、液固体积比为4 ∶1、反应时间为120 min。在此条件下进行检验性实验，所得五氧化二磷收率超过89%，氧化钾收率超过99%。对滤渣进行XRD分析，发现滤渣由硫酸钙组成，没有钾石膏生成。该方法具有操作简单、成本低、收率高等优点。

Technology for production of potassium dihydrogen phosphate with calcium hydrophosphate

A new technology for producing potassium dihydrogen phosphate with calcium hydrophosphate and potassium hydrogen sulfate was introduced.Influences of amount-of-substance ratio of calcium hydrophosphate to potassium hydrogen sulfate,reaction temperature,volume ratio of liquid to solid,and reaction time were investigated by single factor experiments and optimal process conditions were obtained as follows:amount-of-substance ratio of calcium hydrophosphate to potassium hydrogen sulfate was 0.8 ∶ 1,reaction temperature was 70 ℃,volume ratio of liquid to solid was 4 ∶ 1,and reaction time was 120 min.Under the above conditions,experiment was taken to confirm that P2O5 recovery exceeded 89% and K2O recovery exceeded 99%.Residuce was analyzed by XRD,and result verified that the composition of residuce was CaSO4,without syngenite.Features of this method were characterized by simple operation,low cost,and high yield etc.