Inorganic Chemicals Industry >
Research on deep purification process of glauberite gypsum
Received date: 2022-02-23
Online published: 2022-11-23
Glauberite gypsum is the by-product tailings produced by leaching sodium sulfate in the industry.Compared with industrial by-product gypsum such as desulfurized gypsum and phosphogypsum，it has higher impurity content，lower purity and utilization value.Glauberite gypsum was purified by acid leaching-recrystallization process，the acid-soluble impurities in Glauberite gypsum were removed by acid leaching and dihydrate calcium sulfate（DH） was converted into anhydrous calcium sulfate（AH）.Then hydration conditions were controlled to hydrate AH into large-size DH crystals separated from small-sized acid-insoluble impurities to obtain high-purity dihydrate gypsum.The effects of sulfuric acid concentration，hydration activator，liquid-solid ratio and reaction time on purified gypsum were studied.The research results showed that under normal pressure，when the mass fraction of sulfuric acid pickling solution was 35%，the reaction temperature was 80 ℃，the solid-liquid ratio of gypsum and sulfuric acid solution was 1∶5，and the pickling time was 2 h，it could effectively remove acid-soluble impurities in glauberite gypsum.When mass fraction of hydrate sulfuric acid was 5%，mass fraction of potassium sulfate was 1.74%，reaction temperature was 25 ℃，solid-liquid ratio was 1∶6，aging time was 18 h，it could effectively remove acid-insoluble impurities in glauberite gypsum，and the purity of purified gypsum could reach more than 97%.
Key words： glauberite gypsum; gypsum purification; recrystallization
Huibin YIN , Jun LI , Zhuochao ZHENG . Research on deep purification process of glauberite gypsum[J]. Inorganic Chemicals Industry, 2022 , 54(11) : 104 -111 . DOI: 10.19964/j.issn.1006-4990.2022-0075
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