Inorganic Chemicals Industry >
Study on purification of glauberite gypsum by crystalline phase transition method
Received date: 2024-12-30
Online published: 2025-03-15
Glauberite gypsum is the leaching tailings produced during the dissolved leaching of calcium glauberite ore.Due to the low purity and high content of insoluble impurities，there are very few application avenues.In response to the above problems，utilizing a crystalline phase transition method，dihydrate calcium sulfate from glauberite gypsum was successfully transformed into large glauberite crystals.These were then separated from smaller insoluble impurities based on particle size differences.Controlled hydration leaching conditions facilitated the conversion of glauberite back into dihydrate gypsum to obtain high-purity dihydrate gypsum.The impact of variables such as sodium sulfate mass concentration，temperature，leaching duration，and liquid-to-solid mass ratio on the size of the glauberite crystals and the yield of CaO were analyzed meticulously.Optimal conditions were identified：sodium sulfate mass concentration of 20%，temperature of 85 ℃，leaching duration of 3.0 h，and liquid-to-solid mass ratio of 6∶1.These conditions resulted in the formation of large-sized glauberite crystals and enabled effective separation of impurities by physical means such as sieving and cyclone，achieving a CaO yield of 79.60% and producing gypsum with a mass fraction of 89% after leaching.
LIU Hongzhen , ZHENG Zhuochao , LI Jun . Study on purification of glauberite gypsum by crystalline phase transition method[J]. Inorganic Chemicals Industry, 2025 , 57(12) : 77 -82 . DOI: 10.19964/j.issn.1006-4990.2024-0701
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