Preparation method of rhombohedral anhydrous magnesium carbonate
A technology of anhydrous magnesium carbonate and rhombohedron, applied in the direction of magnesium carbonate, etc., can solve the problems affecting the performance of processing technology and product performance, the increase of production cost, and the influence of product purity, so as to achieve easy control of production conditions, low production cost, The effect of complete 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 mass molar ratio of O is 1:8 by adding CH 4 N 2 O, stirred to obtain a transparent solution; MgCl 2 ·6H 2 O and CH 4 N 2 The solution prepared by O is heated to carry out pre-synthesis reaction, the reaction temperature is 95°C, and the reaction time is 1h;
[0022] (2) Transfer the mixed liquid 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;
[0023] (3) After the hydrothermal reaction is completed, the product is filtered under negative pressure, washed and dried to obtain rhombohedral anhydrous magnesium carbonate.
[0024] According to X-ray diffraction analysis, anhydrous magnesium carbonate belongs to the trigonal crystal system ( figure 1 ), ...
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 mass molar ratio of O is 1:8 by adding CH 4 N 2 O, stirred to obtain a transparent solution; MgCl 2 ·6H 2 O and CH 4 N 2 The solution prepared by O is heated to carry out pre-synthesis reaction, the reaction temperature is 90°C, and the reaction time is 2h;
[0027] (2) Transfer the pre-synthesized mixed solution 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 4 hours;
[0028] (3) After the hydrothermal reaction is completed, the product is filtered under negative pressure, washed and dried to obtain rhombohedral anhydrous magnesium carbonate.
Embodiment 3
[0030] (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 2The mass molar ratio of O is 1:8 by adding CH 4 N 2 O, stirred to obtain a transparent solution; MgCl 2 ·6H 2 O and CH 4 N 2 The solution prepared by O is heated to carry out pre-synthesis reaction, the reaction temperature is 80°C, and the reaction time is 2h;
[0031] (2) Transfer 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;
[0032] (3) After the hydrothermal reaction is completed, the product is filtered under negative pressure, washed and dried to obtain rhombohedral anhydrous magnesium carbonate.
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