摘要
目前,国内外生产的硫酸钾产品普遍存在粒度小、形貌差等问题。先用在线粒度仪分析无水乙醇加入量、搅拌转速、超声波功率等条件对硫酸钾起晶晶核的影响,然后研究硫酸钾晶核在浓缩的含硫酸钾洗脱液中生长的产品晶形的特点,为企业利用糖蜜酒精废液中的钾离子生产大颗粒硫酸钾提供理论支持。实验结果表明:在低温浴槽温度为30℃、搅拌转速为250r/min、超声波功率为50W、无水乙醇与饱和硫酸钾溶液质量比为1∶1条件下起晶,制得的硫酸钾晶核尺寸均匀、表面完整,颗粒平均弦长为14.5μm。将制备的硫酸钾晶核投入到浓缩的从糖蜜酒精废液中分离出来的含硫酸钾的洗脱液中生长,可以得到粒度较大、晶形完整的硫酸钾产品,硫酸钾产品中粒度大于385μm的晶体质量占结晶体质量的81.2%左右,钾离子结晶回收率约为85.8%。
At present,the potassium sulfate products produced at home and abroad generally have the problems of small size and poor morphology.Firstly,the effects of anhydrous ethanol adding dosage,stirring speed,ultrasonic wave power and other conditions on the crystallization nucleus of potassium sulfate were analyzed by online particle size analyzer.Then the characteristics of the crystal shape of the product grown with potassium sulfate nucleus in concentrated potassium sulfate-containing eluent was studied,which provided theoretical support for enterprises to produce large particles of potassium sulfate by using potassium ions in molasses alcohol waste liquid.The experimental results showed that the potassium sulfate crystal nucleus was uniform in size,smooth in surface and the average chord length of the particles was 14.5 μm when the temperature of water bath was 30 ℃,the stirring speed was 250 r/min,the ultrasonic wave power was 50 W and the mass ratio of anhydrous ethanol to saturated potassium sulfate solution was 1∶1.The prepared potassium sulfate crystal nucleus were put into a concentrated potassium sulfate-containing eluate separated from the molasses alcohol waste liquid to obtain a potassium sulfate product with a larger particle size and a completed crystal form,The crystal quality of the potassium sulfate product with a particle size greater than 385 μm accounted for about 81.2% of the total crystal mass,and the potassium ion crystal recovery rate was about 85.8%.
作者
张平军
于淑娟
Zhang Pingjun;Yu Shujuan(Guangdong Provincial Bioengineering Institute(Guangzhou Sugarcane Industry Research Institute),Guangzhou 510316,China;College of Light Industry and Food Science,South China University of Technology;Guangdong Engineering Research Center for Sugar Technology)
出处
《无机盐工业》
CAS
CSCD
北大核心
2019年第6期65-68,共4页
Inorganic Chemicals Industry
基金
广东省科技计划项目(2016A020210014,2017A040405042,2016B070701005,2016A020210018)
关键词
在线分析
乙醇
超声波
硫酸钾
online analysis
ethanol
ultrasonic wave
potassium sulfate
