Inorganic Chemicals Industry >
Experimental study on preparation of ammonium fluosilicate from fluorinated silica slag dissolved by ammonium fluoride
Received date: 2019-08-07
Online published: 2020-02-26
Ammonium fluosilicate was prepared with ammonium fluoride solution and fluorinated silica slag as raw materials by chemical dissolution.The effects of reaction temperature,reaction time,concentration of ammonium fluoride solution and material ratio(amount-of-substance ratio of ammonium fluoride to silica) on the yield of ammonium fluosilicate and conversion of silicon dioxide were investigated.The experimental results showed that the reaction temperature was 93 ℃,the reaction time was 60 min,the mass fraction of ammonium fluoride solution was 20%~30%,the materials ratio was 6∶1.1 and the stirring speed of reaction system was at 200~300 r/min.Under the conditions,the yield of ammonium fluosilicate and the conversion of ammonium fluoride can be controlled over 90%.
Key words: ammonium fluoride; silicon slag; ammonium fluosilicate
Yanfeng Sui , Songlin Liu , Hong Qin . Experimental study on preparation of ammonium fluosilicate from fluorinated silica slag dissolved by ammonium fluoride[J]. Inorganic Chemicals Industry, 2020 , 52(1) : 76 -78 . DOI: 10.11962/1006-4990.2019-0083
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