Self-retention heavy calcium carbonate and preparation method thereof
A technology of calcium carbonate and calcite, applied in the direction of calcium carbonate/strontium/barium, fibrous fillers, etc., can solve the problems of affecting the bulk of the paper sheet, the decrease of the first pass retention rate, the decrease of the retention rate, etc., and achieve fixed equipment investment. The effect of less bulk, improved bulk, and low manufacturing cost
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Embodiment 1
[0017] The particles of the ground calcium carbonate product of the present embodiment are aggregated, and the average particle diameter D50 is 7.2 μm; D25 is 2.8 μm.
[0018] Preparation: (1) Add 3.5kg of sodium polyacrylate dispersant to 300kg of water to dilute, under stirring, add 700kg of 325 mesh calcite powder into the above aqueous solution containing sodium polyacrylate, and stir evenly to obtain calcite pulp;
[0019] (2) Put the calcite slurry obtained in step (1) into a continuous agitating grinder, and put 100 kg of abrasive—zirconia balls into the machine, and grind continuously until the D50 is 1.8 μm;
[0020] (3) Put the calcite slurry obtained in step (2) into the modification machine, which has put 100 kg of modifier polyacrylamide aqueous solution (including 0.25 kg of polyacrylamide) and 300 kg of water into the modification machine, and continuously stir until completely Until the aggregation, the self-retaining ground ground calcium carbonate slurry with...
Embodiment 2
[0024] The particles of the ground calcium carbonate product in this embodiment are in an aggregated form, and the average particle diameter D50 is 6.6 μm; D25 is 2.6 μm.
[0025] Preparation: (1) Add 4.5 kg of sodium hexametaphosphate into 400 kg of water, stir until completely dissolved, add 800 kg of 325 mesh calcite powder into the above aqueous solution containing sodium hexametaphosphate, and stir to obtain calcite slurry;
[0026] (2) Put the calcite slurry obtained in step (1) into a continuous agitating grinder, and put 120 kg of grinding agent—zirconia balls into the machine, and grind continuously until the D50 is 2.0 μm;
[0027] (3) Put the ground calcite slurry in step (2) into the modification machine, and put 150kg of modifier polydiallyldimethyl ammonium chloride aqueous solution (containing polydiallyl di Methyl ammonium chloride 0.3 kg) and water 200kg, stirring continuously until completely aggregated. A self-retaining ground ground calcium carbonate slurr...
Embodiment 3
[0031] The particles of the ground calcium carbonate product in this embodiment are in an aggregated form, and the average particle diameter D50 is 7.7 μm; D25 is 2.9 μm.
[0032] Preparation: (1) Add 3.5 kg of sodium polyacrylate dispersant to 300 kg of water to dilute, under stirring, add 700 kg of 325 mesh calcite powder to the above aqueous solution containing sodium polyacrylate, and stir evenly to obtain calcite slurry;
[0033] (2) Put the calcite slurry obtained in step (1) into a continuous agitating grinder, and put 100 kg of grinding agent—zirconia balls into the machine, and grind continuously until the D50 is 1.6 μm;
[0034] (3) Put the calcite pulp obtained in step (2) into the modification machine, in which 175kg of modifier acrylamide-acrylic acid copolymer aqueous solution (containing 0.35kg of acrylamide-acrylic acid copolymer) and 300kg of water , Stirring continuously until completely aggregated, to obtain a self-retention grinding ground calcium carbonate...
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