CO2矿化硫酸镁制备三水合碳酸镁的形貌调控研究

doi:10.19964/j.issn.1006-4990.2024-0410

Abstract

Abstract:

One of the reprocessing ways of magnesium resources in salt lake is to prepare magnesium carbonate products by mineralization of magnesium chloride，but the mineralization process experience is still limited when magnesium source is magnesium sulfate，and the morphology and particle size are difficult to control.To solve the above problems，MgCO₃·3H₂O crystals were prepared by mineralizing CO₂ with MgSO₄·7H₂O as magnesium source，and the experimental study on process optimization was carried out. The products were characterized by X-ray diffractometer and scanning electron microscope.The correlation between reaction conditions and crystal composition and morphology was investigated.The process of CO₂mineralization was also analyzed.The results showed that when the reaction temperature was 50 ℃，the initial concentration of MgSO₄ was 0.6 mol/L，and the concentration of NH₃·H₂O was 4.0 mol/L，MgCO₃·3H₂O crystals with good crystallization，smooth surface and regular morphology could be obtained.When MgSO₄·7H₂O was used as magnesium source，the basic transformation temperature of MgCO₃·3H₂O was up to 80 ℃，and the initial concentration of MgSO₄ required for obtaining high⁃quality MgCO₃·3H₂O crystals was up to 0.6 mol/L.The process conditions were more severe when MgCl₂·6H₂O was magnesium source.MgCO₃·3H₂O prepared with MgSO₄·7H₂O as magnesium source was a rod⁃like crystal with a diameter of 1~3 μm，which was different from the whisker and rod products of MgCl₂·6H₂O as magnesium source.The reaction process of mineralized CO₂ with MgSO₄·7H₂O as magnesium source was mainly composed of three stages，namely，the formation of Mg（OH）₂，the dissolution of Mg（OH）₂ and the formation of MgCO₃·3H₂O.

Key words: magnesium resources, magnesium carbonate hydrate, crystal morphology, CO₂mineralization, magnesium sulfate

CLC Number:

O614.22

MA Chuxuan, CHENG Huaigang, CHENG Wenting, MA Zhuohui. Study on morphology control of magnesium carbonate trihydrate prepared by CO₂ mineralization of magnesium sulfate[J]. Inorganic Chemicals Industry, 2025, 57(5): 26-31.

Figures/Tables 9

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Study on morphology control of magnesium carbonate trihydrate prepared by CO₂ mineralization of magnesium sulfate

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Study on morphology control of magnesium carbonate trihydrate prepared by CO2 mineralization of magnesium sulfate