常压Mg-Na复合盐溶液体系制备α-半水石膏

doi:10.19964/j.issn.1006-4990.2023-0116

Abstract

Abstract:

The species and concentration of salt solution are the key factors of the preparation process of α-hemihydrate gypsum in the atmospheric salt solution method.With Mg（NO₃）₂ as main composition，three kinds of mixed salt solution，including Mg（NO₃）₂-NaCl、Mg（NO₃）₂-Na₂SO₄ and Mg（NO₃）₂-NaNO₃，were employed to investigate the crystal transformation from dihydrate gypsum to α-hemihydrate gypsum，and the effects of the concentration of mixed salts，crystal modifier type and dosage on the transformation rate of dihydrate gypsum and crystal morphology were studied in the Mg（NO₃）₂-NaCl solution.The results showed that in the mixed salt solution of Mg（NO₃）₂-1%NaCl，the minimum Mg（NO₃）₂ mass fraction for the complete conversion of gypsum dihydrate to gypsum hemihydrate within 4 h was 27%.As the mass fraction of Mg（NO₃）₂ increasing from 27% to 36%，the supersaturation of the solution and transformation rate of dihydrate gypsum were increased，and the induction period was decreased from 90 min to 20 min.Using DL-malic acid，maleic acid and 3-nitrophthalic acid as crystal modifiers，the transformation rate of dihydrate gypsum was decreased and the aspect ratio was reduced.When the mass fraction of DL-malic acid was 1%，the absolute dry compressive strength of the α-hemihydrate gypsum was 21.74 MPa.

Key words: α-hemihydrate gypsum, atmospheric salt solution method, crystal modifier, crystal morphology, mechanical property

CLC Number:

TQ177.3

LI Yunfei, LIU Shuqing, TANG Shengwei, ZHANG Tao. Preparation of α-hemihydrate gypsum in Mg-Na mixed salt solution system under atmospheric pressure[J]. Inorganic Chemicals Industry, 2023, 55(11): 100-106.

Figures/Tables 15

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项目	w（O）/%	w（Ca）/%	w（S）/%
EDS检测值	51.3	26.7	22.0
理论值	49.6	27.6	22.1

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Inorganic Acid-Base-Salt Committee of CIESC

Preparation of α-hemihydrate gypsum in Mg-Na mixed salt solution system under atmospheric pressure

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