Precipitation method can conveniently and effectively reduce the lithium ion content in the chemical strengthening salt bath.Different contents of sodium phosphate were added to the poisoning salt bath.By analyzing the changes of Li add P element contents in the salt bath,the appropriate addition ratio of sodium phosphate was determined to be n(LiNO3)∶n(Na3PO4)=1.75∶1～1.5∶1.By analyzing the elemental composition of the precipitate,the chemical formula of the precipitate under different ratios of sodium phosphate addition was determined.
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