A kind of preparation method of dirhombohedral anhydrous magnesium carbonate
A technology of anhydrous magnesium carbonate and rhombohedral, applied in the direction of magnesium carbonate, etc., can solve the problems of affecting the performance of processing technology and product performance, affecting the purity of products, and increasing production costs, so as to achieve easy control of production conditions and complete crystal morphology , the effect of low production cost
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Embodiment 1
[0022] (1) MgCl 2 ·6H 2 Add O into distilled water to prepare a transparent solution with a concentration of 0.2 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;
[0023] (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;
[0024] (3) Slowly add NaOH to the mixed solution of the pre-synthesis reaction, adjust the pH value of the mixed solution to 13; then move the mixed solution to a stainless steel reactor with a polytetrafluoroethylene liner for hydrothermal reaction, and the hydrothermal reaction The temperature is 160°C, and the reaction time is 4h;
[0025] (4) After the hydrothermal reaction is completed, the product is filtered and washed under negative pressure to obtain dirhombohedral anhydrous magnesium carbonate; the dirhombohedral anhydrous magnesiu...
Embodiment 2
[0027] (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;
[0028] (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;
[0029] (3) Slowly add NaOH to the mixed solution of the pre-synthesis reaction, adjust the pH value of the mixed solution to 13; then move the mixed solution to a stainless steel reactor with a polytetrafluoroethylene liner for hydrothermal reaction, and the hydrothermal reaction The temperature is 150°C, and the reaction time is 6h;
[0030] (4) After the hydrothermal reaction is completed, the product is filtered and washed under negative pressure to obtain dirhombohedral anhydrous magnesium carbonate; the dirhombohedral anhydrous magnesium c...
Embodiment 3
[0032] (1) MgCl 2 ·6H 2 Add O into distilled water to prepare a transparent solution with a concentration of 0.3 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;
[0033] (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 85°C, and the reaction time is 2h;
[0034] (3) Slowly add NaOH to the mixed solution of the pre-synthesis reaction, adjust the pH value of the mixed solution to 13; then move the mixed solution to a stainless steel reactor with a polytetrafluoroethylene lining for hydrothermal reaction, The temperature is 155°C, and the reaction time is 5h;
[0035] (4) After the hydrothermal reaction is completed, the product is filtered and washed under negative pressure to obtain dirhombohedral anhydrous magnesium carbonate; the dirhombohedral anhydrous magnesium carbonate belongs to the tr...
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