软钾镁矾和氯化钾转化硫酸钾结晶粒度研究

发布时间：2018-04-10 09:15

本文选题：硫酸钾　切入点：结晶　出处：《无机盐工业》2017年03期

【摘要】：以前期实验结论为指导,结合相图、溶解结晶理论设计实验方案,探究了温度、加料方式、晶种、过饱和度对软钾镁矾(K2SO4·Mg SO4·6H2O)和氯化钾转化硫酸钾结晶粒度的影响。实验结果表明:在25~55℃范围内,随着温度升高,硫酸钾晶体平均粒径增大;分时变温,在55℃转化60 min,然后在25℃降温60 min,可以使反应较为快速地达到平衡,减少溶解转化的时间,同时提高了硫酸钾的收率,改善了硫酸钾晶体的粒度分布;改变加料方式,先加入氯化钾,30 min后加入软钾镁矾,在25℃条件下转化结晶120 min,所得硫酸钾晶体的平均粒径比混合加料方式增大约1.9倍;选择特定时间添加晶种和缓慢加入原料,所得硫酸钾晶体的平均粒径显著增大。此研究结果对实际生产中的工艺优化、产品控制具有一定的指导意义。
[Abstract]:In the early conclusion of the experiment as a guide, combined with the phase diagram of dissolution crystallization theory to design the experiment and research of temperature, feeding, seed, supersaturation of picromerite (K2SO4 - Mg SO4 - 6H2O) and the effect of potassium chloride conversion of potassium sulfate crystal size. The experimental results show that in the temperature range of 25~55, with the temperature, potassium sulfate crystal particle size increases; when the temperature is divided into 60, min at 55 DEG C, and then temperature 60 min at 25 DEG C, the reaction is quick to achieve balance, reduce the time of the dissolution and transformation, and increase the yield of potassium sulfate, improve the particle size distribution of potassium sulfate crystals; changing the feeding first, adding potassium chloride, 30 min after adding picromerite, crystallization of 120 min under the condition of 25 DEG C, the average particle diameter ratio of the mixed crystal of potassium sulfate feeding increased by about 1.9 times; select the specific time of adding seed crystal and slowly add raw materials, income The average particle size of potassium sulfate crystal increases significantly. The results of this study have a certain guiding significance for the process optimization and product control in the actual production.

【作者单位】：中国科学院青海盐湖研究所;中国科学院大学;
【基金】：高新技术研究与发展计划(2012-G-212A) 青海省科技支撑项目(2013-G-139A)
【分类号】：TQ131.13

【参考文献】