With the boosting demand for light magnesium carbonate, the preparation approach of premium light magnesium carbonate has very vital theoretical significance and application value. In industry, we can make use of the commercial by-product magnesium hydroxide suspension to respond with co2 to prepare light magnesium carbonate, and also the sodium sulfate and also other substances had in the magnesium hydroxide suspension will certainly not respond with co2 gas.
Utilizing light-burned dolomite powder as basic material, high-activity dolomite powder digestion solution is prepared by food digestion, and afterwards the regular stress second carbonization method is made use of to prepare light magnesium carbonate. By studying various affecting factors in the prep work process, We figured out the most effective procedure criteria, and carried out a preliminary discussion on its mechanism of activity. The results show that the optimal procedure problems for food digestion are as follows: gently burned dolomite is ground into small fragments with a typical particle size of 1.78 μm, digested for 30 minutes at a water temperature of 70 ° C, as well as cooled and precipitated at area temperature for 24 hours. i.e. digestive juices;
The optimal process conditions for carbonization are: using the normal stress secondary carbonization approach, the pH values of the first and 2nd carbonization quit power are specifically pH=10 as well as pH=9, and also the CO partial pressures of the first and 2nd carbonization are specifically Pco =0.03 MPa, Pco=0.1 MPa, the concentration of carbonization option is 25g. L, the mixing rate is 400rpm; under the problem of pyrolysis temperature of 50 ℃, the size has to do with 6060μm, the cross-sectional size is about 2μm, as well as the whiteness is 97.3, light magnesium carbonate with a magnesium oxide material of 41.0% as well as a calcium oxide web content of 0.4%. The healing price of light magnesium carbonate item was 54.3%. When the pyrolysis temperature is 60 ° C, flake or increased petal-shaped light magnesium carbonate can be prepared; when the pyrolysis temperature gets to 70 ° C, spherical light magnesium carbonate with a diameter of concerning 40 μm can be prepared.
The change of pyrolysis temperature will influence the pyrolysis rate as well as solution framework of magnesium bicarbonate service, and type flake or round light magnesium carbonate via two-dimensional nucleation or the fortifying of intermolecular bonding; when hefty magnesium water goes to 50 When pyrolyzing at ℃, the rod-shaped light magnesium carbonate without additives will certainly agglomerate, including sodium citrate can make the bits of rod-shaped light magnesium carbonate equally dispersed, including ethanol can reduce the facet proportion of light magnesium carbonate, Including magnesium chloride can boost the crystal size of rod-shaped light magnesium carbonate. The major factor is that the addition of ingredients can change the formation actions of light magnesium carbonate and also the supersaturation of the solution.