Preparation method of lamellar crystal light calcium carbonate for paper making coating
A technology of light calcium carbonate and flaky crystals, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of difficult preparation and few breakthroughs by researchers, and achieve the effect of simple preparation and operation and easy industrialization
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Embodiment 1
[0020] Weigh 11g calcium chloride into a 6% aqueous solution, then weigh 10.4g potassium carbonate into a 10% solution, adjust the temperature to 15℃, slowly add the potassium carbonate solution to the calcium chloride solution to prepare 7.5g calcium carbonate seeds , Add the prepared seed crystal and its mother liquor to 2716mL of 5% lime milk, adjust the temperature to 12℃, and control CO 2 The flow rate is 0.38m 3 / h, the carbonization reaction is carried out. After the carbonization reaches the end point, the product is filtered and dried to obtain a finished product. The finished product was observed with a transmission electron microscope, the average particle size of the crystal was 0.4μm, and the crystal shape was flake.
Embodiment 2
[0022] Weigh 120g calcium nitrate to make a 10% aqueous solution, then weigh 60g ammonium bicarbonate to make a 15% solution, adjust the temperature to 25℃, slowly add the calcium nitrate solution to the ammonium bicarbonate solution to prepare 50g calcium carbonate seed crystals. The prepared seed crystal and its mother liquor are added to 934mL of 12% lime milk, and the temperature is adjusted to 30℃ to control CO 2 The flow rate is 0.13m 3 / h, the carbonization reaction is carried out. After the carbonization reaches the end point, the product is filtered and dried to obtain a finished product. The finished product was observed with a transmission electron microscope, the average grain size of the crystal was 0.6μm, and the crystal shape was flake.
Embodiment 3
[0024] Weigh 105.6g calcium acetate and 95.6g calcium chloride each to make a 20% aqueous solution, then weigh 80g sodium bicarbonate and 30g potassium bicarbonate each to make a 30% solution, adjust the temperature to 30℃, and chlorinate the calcium acetate and The calcium mixed solution was slowly added to the sodium bicarbonate and potassium bicarbonate mixed solution to prepare 125g of calcium carbonate seed crystals. The prepared seed crystals and the mother liquor were added to 875mL of 8% lime milk, and the temperature was adjusted to 45°C to control CO 2 The flow rate is 0.27m 3 / h, the carbonization reaction is carried out. After the carbonization reaches the end point, the product is filtered and dried to obtain a finished product. The finished product was observed with a transmission electron microscope, the average grain size of the crystal was 0.5 μm, and the crystal shape was flake.
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