Research on the Preparation of Zinc Fluosilicate Hexahydrate from Phosphate Fertilizer by-product Fluorosilicic Acid and Its Vacuum Production Process
Using by-products fluorosilicic acid and zinc oxide as raw materials,hexahydrate zinc fluorosilicate products were prepared through neutralization reaction.In order to explore the optimal process conditions for industrial preparation of hexahydrate zinc fluorosilicate products,reduce energy consumption,and improve product quality,the effects of process parameters such as reaction temperature,reaction time,material ratio,and concentration method on product content and yield were systematically studied.The results showed that under the process conditions of a reaction temperature of 30℃,a reaction time of 2 hours,a molar ratio of zinc oxide to fluorosilicic acid(calculated as H2SiF4 )of 1:1.2,and a concentration method of low-temperature vacuum evaporation concentration(evaporation temperature of 45℃-55℃),referring to the enterprise standard(Q/KHQ 001-2016),the first grade hexahydrate zinc fluorosilicate can be prepared,with a content of 98.92％ and a yield of 96.68％.
By-product fluorosilicic acidNeutralization reactionHexahydrate zinc fluorosilicateReduce energy consumption
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