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Study on process technology of preparing NH4F and co-producing MgF2 with high impurity fluosilicic acid
Received date: 2020-04-24
Online published: 2020-11-24
An Efficient utilization process of high impurity fluosilicic acid was designed and researched to produce NH4F with co-production of MgF2.On the basis of characteristics of high impurity fluosilicic acid and mother liquor of NH4F,a series of key factors were deeply studied to make up for the lack of related researches,including pH,reaction temperature,free ammonia,feeding method,exothermic curve,concentration curve and material balance,etc..Optimized process conditions were obtained,under which,the yield of primary crystallization of NH4F was about 25%,which meet the requirements of first-class products in GB/T 28653—2012;the yield of MgF2 reached more than 95%,which meet the MF-2 requirements of YS/T 691—2009.Research on concentration revealed that there was a good linear relationship between the concentration and density of NH4F(y=3.9778x-4.0017;y:the concentration;x:the density),and the critical crystallization density was 1.14 g/cm3.Material balance research showed that the studied process had a high raw material utilization and important industrial application value.
Zhong Huang , Shuangqiang Yu , Kaiyuan Gao , Jun He , He Huang , Xianfeng Zhang , Xizhen Chen . Study on process technology of preparing NH4F and co-producing MgF2 with high impurity fluosilicic acid[J]. Inorganic Chemicals Industry, 2020 , 52(10) : 110 -116 . DOI: 10.11962/1006-4990.2019-0609
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