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Development and practice of continuous defluoridation technology for by-products fluorinated hydrochloric acid of lithium hexafluorophosphate
Received date: 2023-02-06
Online published: 2023-11-16
Fluorinated hydrochloric acid is a by-product of lithium hexafluorophosphate，and the removal of fluorine is the key to its recycling. Based on the analysis of the problems and shortcomings of the batch defluoridation process，a continuous defluoridation technology was proposed to remove fluorine from fluorinated hydrochloric acid. Continuous defluoridation technology significantly improved the automation，quality，capacity，and environmental management of the defluoridation process.As a result，the fluoride content in HCl was decreased from 55 g/L to 11 g/L，the production capacity was enhanced by 118%，the labor efficiency per capita was improved by 337%，the particle size of calcium fluoride was increased by about 30%，the solid waste emission was reduced by 52%，and the tail gas emission reached the ultra-low emission standard（fluoride content ≤3 mg/m³ and particulate matter content ≤10 mg/m³）.
ZHOU Xiaoping , FENG Haoshou , ZHANG Guohui , HOU Shilei , ZHANG Shuaipeng , LIU Lixia . Development and practice of continuous defluoridation technology for by-products fluorinated hydrochloric acid of lithium hexafluorophosphate[J]. Inorganic Chemicals Industry, 2023 , 55(11) : 93 -99 . DOI: 10.19964/j.issn.1006-4990.2023-0052
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