磷酸氢钙制备磷酸二氢钾的工艺研究Ⅱ——母液的净化、蒸发和结晶  

Study on preparation of potassium dihydrogen phosphate with calcium hydrogen phosphate Ⅱ: purification,evaporation,and crystallization of mother liquid

作　　者：李春丽[1] 关云山[1] 张志强[1] 邢英[1] 梁之帅[1] 张英智[1] 何全胜 

机构地区：[1]青海大学化工学院,青海西宁810016 [2]青海明胶股份有限公司

出　　处：《无机盐工业》2011年第8期51-53,共3页Inorganic Chemicals Industry

基　　金：科技部科技人员服务企业行动项目(2009GJG20019)

摘　　要：以明胶厂富产的磷酸氢钙为原料,与硫酸钾在液相中进行复分解反应,得到的母液经净化、蒸发和结晶制备得到磷酸二氢钾。考察了母液净化方式、母液pH、水蒸发量和自然冷却结晶等过程对产品纯度和质量的影响。结果表明:以氢氧化钠作除杂剂,控制母液pH=4.5,水蒸发量为70%(质量分数),自然冷却结晶得到的磷酸二氢钾产品可以达到国家工业一等品标准。After purification,evaporation,and crystallization,potassium dihydrogen phosphate was manufactured with mother liquid,which was prepared with calcium phosphate by-produced from gelatin plant and potassium sulfate by double decomposition reaction.Influences of the way of purification,pH of mother liquid,evaporation process,and natural cooling crystallization process on the purity and quality of product were also studied.Results showed that when sodium hydroxide was used as trash-removal agent,pH of mother liquid was 4.5,water evaporation was at 70%（mass fraction）,and natural cooling crystallization was adopted,the quality of potassium dihydrogen phosphate reached the first grade requirement of the national industrial standard.

关 键 词：磷酸二氢钾 母液 磷酸氢钙 明胶 

分 类 号：TQ126.35[化学工程—无机化工]