反应萃取法制备熔盐级硝酸钾工艺探讨
收稿日期: 2019-11-16
网络出版日期: 2020-05-21
基金资助
青海省应用基础研究项目(2018-ZJ-738);青海省应用基础研究项目(2017-ZJ-727);国家重点研发计划(2018YFC1903803);国家自然科学基金(51774144)
Study on preparation of molten salt grade potassium nitrate by reactive extraction method
Received date: 2019-11-16
Online published: 2020-05-21
苏磊 , 张海军 , 汪瑾 , 于雪峰 , 董昌吉 , 孙泽 , 宋兴福 , 于建国 . 反应萃取法制备熔盐级硝酸钾工艺探讨[J]. 无机盐工业, 2020 , 52(5) : 35 -39 . DOI: 10.11962/1006-4990.2019-0378
Reactive extraction method is a low-cost and high-efficiency method for preparing molten salt grade potassium ni-trate.The process of preparing molten salt grade potassium nitrate by potassium chloride and nitric acid was studied.The opti-mal reactive crystallization conditions under laboratory were obtained by parameter optimization.The amount-of substance ra-tio of HNO3 to KCl was about（1.4~1.5）∶1,the cooling crystallization temperature was at 5~10 ℃ and the cooling crystalliza-tion time was 60 min,the molten salt grade potassium nitrate having a purity greater than 99.4% was obtained by recrystalliza-tion.The nitric acid in the mother liquor can be efficiently extracted by the agent consisting of TBP and sulfonated kerosene at an extraction temperature of 30 ℃,the TBP volume fraction of 30% and an O/A ratio of 5∶1.
Key words： potassium nitrate; reactive crystallization; solvent extraction
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