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Method for grinding superfine heavy calcium carbonate in dry method

A heavy calcium carbonate, dry grinding technology, applied in the direction of dyeing physical treatment, fibrous fillers, etc., can solve the problems of not being able to obtain heavy calcium carbonate dry powder products, hard agglomeration of fine particles, and coarse particle size, etc., to achieve easy Large-scale production, increase the degree of ultra-fineness, and reduce the effect of agglomeration

Active Publication Date: 2010-07-07
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if it is made into dry powder, it will lead to the hard agglomeration of fine particles during the drying process, the particle size will become coarser, and the quality will decrease.
Dry grinding is generally used to produce 400-1250-mesh powder products. The current dry grinding process cannot obtain ground calcium carbonate dry powder products with a particle size of -2μm and 30 grades or even finer.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation of calcium stearate wetting agent:

[0042] Add 306 grams of water to a four-necked flask with a thermometer, heat up to 70°C, add 12 grams of emulsifier sorbitan monostearate, 15 grams of PEG400, 10 grams of dispersant sodium tripolyphosphate, and 10 grams of sodium polyacrylate. gram, 7 grams of defoaming agent water-soluble silicone oil, slowly add 480 grams of molten stearic acid after stirring evenly, 80 grams of alkalizing agent calcium hydroxide, 20 grams of emulsifier sorbitan monopalmitate, polyoxyethylene ( 20) 25 grams of sorbitan monooleate. After the addition was complete, the reaction was incubated at 70°C for 8 hours. Add 3 grams of bactericide phosphorochloromethane-cresol, cool down after stirring evenly, and obtain the calcium stearate wetting agent.

[0043] Preparation of superfine ground calcium carbonate:

[0044] Add 99 kilograms of 325 mesh heavy calcium carbonate coarse powder into the 3R3120 Raymond Mill of Qingyang County Anguan...

Embodiment 2

[0046] The preparation of calcium stearate wetting agent: with embodiment 1.

[0047] Preparation of superfine ground calcium carbonate:

[0048] Add 99.5 kg of 325 mesh heavy calcium carbonate coarse powder into the 3R3120 Raymond Mill of Qingyang County Anguang Superfine Powder Equipment Manufacturing Factory, and then add 0.2 kg of sodium carbonate and 0.1 kg of cetyl dimethyl benzyl Ammonium chloride, dry grinding in the grinding medium zirconia, continuously add 0.2 kg of calcium stearate wetting agent while grinding, the addition is completed within 3 hours, the grinding is finished after 4 hours, and a small amount of particles larger than 1000 mesh are removed by sieving Finally, the superfine heavy calcium carbonate dry powder product is obtained. Detected with a JL-1155 laser particle size distribution tester, the mass of particles smaller than 2 μm accounts for 52.8% of the total mass.

Embodiment 3

[0050] The preparation of calcium stearate wetting agent: with embodiment 1.

[0051] Preparation of superfine ground calcium carbonate:

[0052] Add 98.5 kg of 500-mesh heavy calcium carbonate coarse powder into the 4R4121 Raymond mill of Suzhou Heping Mining Machinery Factory, then add 0.5 kg of sodium carbonate and 0.7 kg of cetyl pyridinium chloride, and dry grind in the grinding medium zirconia , while grinding, continuously add 0.08 kg of calcium stearate wetting agent, the addition is completed within 2.5 hours, and the grinding is completed after 5 hours. After removing a small amount of particles larger than 1000 mesh by sieving, an ultra-fine heavy calcium carbonate dry powder product is obtained. Detected with a JL-1155 laser particle size distribution tester, the mass of particles smaller than 2 μm accounts for 45.5% of the total mass.

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Abstract

The invention provides a method for grinding superfine heavy calcium carbonate by a dry method. The method comprises the following steps of: adding coarse heavy calcium carbonate powder into a grinding device, adding a grinding assistant and a surfactant, grinding by adopting the dry method in a grinding medium, and simultaneously adding a wetting agent in the grinding process to obtain the superfine heavy calcium carbonate, wherein the weight of the superfine heavy calcium carbonate with the grain diameter being less than 2mum accounts for 35 to 55 percent relative to the total weight thereof.

Description

technical field [0001] The invention relates to a grinding method of heavy calcium carbonate, in particular to a dry grinding method of superfine heavy calcium carbonate. Background technique [0002] Adding fillers in papermaking can increase the opacity and brightness of paper, improve the smoothness and uniformity of paper, increase the softness of paper, reduce the hygroscopicity and deformation of paper, and also help reduce production costs. Calcium carbonate has a certain cost advantage as a papermaking filler because of its low price, and it can also improve the opacity of paper and increase the ink absorption performance of paper. With the transition from acidic papermaking to neutral papermaking, heavy calcium carbonate has increasingly become an important raw material for China's paper industry to improve paper quality and reduce papermaking costs. [0003] The processing methods of heavy calcium carbonate mainly include dry grinding and wet grinding. Among them...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/04
Inventor 施晓旦田雨
Owner SHANGHAI DONGSHENG NEW MATERIALS
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