Comprehensive utilization and economic benefits of fluoride salt mother liquor

Using fluorin,aluminum and silicon of fluoride salt mother liquor in the wet process as the materials,the process i.e.sodium chloride desilication-compound cryolite-lime addition and fluorin and acid removal was employed by the chemical industry principle.Sodium chloride desilication was considered as the key technology.Silicofluoride acid radical of the mother liquor will be transformed into sodium silicofluoride if excess sodium chloride was added,and the mother liquor was refined.The refined hydrofluoric acid and various aluminum can compose the by-product-cryolite,which can improve the collection rate of fluorin,aluminum and silicon.The results indicate that aluminum fluoride product will be returned about 140 t,sodium silicofluoride and cryolite are 238 t and 206 t,and neutralization residue is 375 t,if the mother liquor output of aluminum fluoride product is 4000 t per year.The annual economic benefit will reach 1,400,000 yuan RMB.