Study on preparation of lithium silicate from lithium fluoride waste
The recovery and treatment of lithium fluoride waste is difficult and costly.The preparation of high-purity and high modulus lithium silicate from lithium fluoride waste is carried out,the effects of slag treatment,calcium chloride concentration,reaction temperature,reaction solution pH,and water glass concentration on lithium yield are investigated.The results show that when the water consumption for washing lithium fluoride waste is three times that of the slag,dried at 120 ℃,the mass fraction of calcium chloride solution is 40％,the reaction temperature is 100 ℃,the stirring speed is 200 r/min,the stirring time is 2 hours,the pH of the reaction solution is 6-7,and the mass concentration of water glass is 8％,the lithium yield reaches 95％.The obtained lithium silicate product meets the requirements of YS/T 1242-2018,providing a feasible path for the resource utilization of lithium fluoride waste.
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