Method for preparing nesquehonite whiskers and nano flaky basic magnesium carbonate

[0049] (1) Magnesium chloride and sodium bicarbonate are prepared in a molar ratio of 1:2 to make the initial concentration of magnesium chloride 0.5mol / L (magnesium chloride hexahydrate 20.3g, distilled water 189.2g), the initial concentration of sodium bicarbonate 0.5mol / L (sodium bicarbonate 16.8 g, distilled water 400g) aqueous solution, the sodium bicarbonate solution is slowly dripped into the magnesium chloride solution at 40°C, the rate of addition is 6mL / min, and the speed of mechanical stirring is 300r / min. Precipitate, continue to stir and age for 50 minutes, and then filter to obtain filter cake and filtrate Ⅰ.

[0050] (2) Wash the filter cake obtained in step (1) with deionized water until no Cl is detected in the washing liquid - (detected with silver nitrate solution), then the filter cake was dried at 40° C. for 4 h to obtain 8.10 g of magnesium carbonate trihydrate whiskers in good shape; Between 27 and 30, please refer to the attached figure 2 with

[0054] (1) Magnesium chloride and sodium bicarbonate are prepared in a molar ratio of 1:2 to make the initial concentration of magnesium chloride 1.5mol / L (magnesium chloride hexahydrate 20.3g, distilled water 55.8g), the initial concentration of sodium bicarbonate 1mol / L (sodium bicarbonate 16.8g , distilled water 200g) aqueous solution, the sodium bicarbonate solution was slowly dropped into the magnesium chloride solution at 45°C, the dropping speed was 5mL / min, and the mechanical stirring speed was 600r / min. After the dropping was completed, the solution produced precipitation after the induction reaction period , continue to stir and age for 60min, and then filter to obtain filter cake and filtrate Ⅰ.

[0055] (2) Wash the filter cake obtained in step (1) with deionized water until no Cl is detected in the washing liquid - (detected with silver nitrate solution), then the filter cake was dried at 45°C for 5 hours to obtain 8.93g of magnesium carbonate trihydrate whis

[0059] (1) Magnesium chloride and sodium bicarbonate are prepared in a molar ratio of 1:2 to make the initial concentration of magnesium chloride 3mol / L (magnesium chloride hexahydrate 20.3g, distilled water 22.5g), the initial concentration of sodium bicarbonate 1.5mol / L (sodium bicarbonate 16.8g , distilled water 133.3g) aqueous solution, the sodium bicarbonate solution is slowly dripped into the magnesium chloride solution at 50°C, the dropping speed is 4mL / min, and the mechanical stirring speed is 900r / min. Precipitate, continue to stir and age for 80 minutes, and then filter to obtain filter cake and filtrate Ⅰ.

[0060] (2) Wash the filter cake obtained in step (1) with deionized water until no Cl is detected in the washing liquid - (detected with silver nitrate solution), then the filter cake was dried at 50°C for 6 hours to obtain 9.61 g of magnesium carbonate trihydrate whiskers in good shape; the average aspect ratio range of the obtained magnesium carbonate tri