A kind of preparation method of rhombohedral anhydrous magnesium carbonate
An anhydrous magnesium carbonate, rhombohedral technology, applied in the direction of magnesium carbonate and the like, can solve the problems affecting the processing technology performance and product use performance, increasing the production cost, affecting the purity of the product, etc., and achieving easy control of production conditions, low production cost, Complete effect of crystal morphology
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Embodiment 1
[0021] (1) MgCl 2 ·6H 2 Add O into distilled water to prepare a transparent solution with a concentration of 0.1 mol / L, and use MgCl 2 ·6H 2 O and CH 4 N 2 The molar ratio of O is 1:8 by adding CH 4 N 2 O, stirred to obtain a mixed solution;
[0022] (2) MgCl 2 ·6H 2 O and CH 4 N 2 The mixed solution prepared by O is heated to carry out the pre-synthesis reaction, the reaction temperature is 95°C, and the reaction time is 1h;
[0023] (3) Move the mixed solution after the pre-synthesis reaction to a stainless steel reactor with a polytetrafluoroethylene liner for hydrothermal reaction. The temperature of the hydrothermal reaction is 150°C, and the reaction time is 2h;
[0024] (4) After the hydrothermal reaction is completed, the product is filtered and washed under negative pressure to obtain rhombohedral anhydrous magnesium carbonate. 25-30 μm.
Embodiment 2
[0026] (1) MgCl 2 ·6H 2 Add O into distilled water to prepare a transparent solution with a concentration of 0.2mol / L, and use MgCl 2 ·6H 2 O and CH 4 N 2 The molar ratio of O is 1:8 by adding CH 4 N 2 O, stirred to obtain a mixed solution;
[0027] (2) MgCl 2 ·6H 2 O and CH 4 N 2 The mixed solution prepared by O is heated to carry out the pre-synthesis reaction, the reaction temperature is 90°C, and the reaction time is 2h;
[0028] (3) Move the mixed solution after the pre-synthesis reaction to a stainless steel reactor with a polytetrafluoroethylene liner for hydrothermal reaction. The temperature of the hydrothermal reaction is 140°C, and the reaction time is 4h;
[0029] (4) After the hydrothermal reaction is completed, the product is filtered and washed under negative pressure to obtain rhombohedral anhydrous magnesium carbonate; anhydrous magnesium carbonate belongs to the trigonal crystal system, the side length of each rhomboid is 20-25 μm, and the rhombohe...
Embodiment 3
[0031] (1) MgCl 2 ·6H 2Add O into distilled water to prepare a transparent solution with a concentration of 0.1 mol / L, and use MgCl 2 ·6H 2 O and CH 4 N 2 The molar ratio of O is 1:8 by adding CH 4 N 2 O, stirred to obtain a mixed solution;
[0032] (2) MgCl 2 ·6H 2 O and CH 4 N 2 The mixed solution prepared by O is heated to carry out the pre-synthesis reaction, the reaction temperature is 80°C, and the reaction time is 2h;
[0033] (3) Move the mixed solution after the pre-synthesis reaction to a stainless steel reactor with a polytetrafluoroethylene liner for hydrothermal reaction, the temperature of the hydrothermal reaction is 145°C, and the reaction time is 3h;
[0034] (4) After the hydrothermal reaction is completed, the product is filtered and washed under negative pressure to obtain rhombohedral anhydrous magnesium carbonate; anhydrous magnesium carbonate belongs to the trigonal crystal system, the side length of each rhomboid is 20-25 μm, and the rhombohe...
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