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Dry grinding method of ultrafine heavy calcium carbonate

A heavy calcium carbonate, dry grinding technology, applied in chemical instruments and methods, treatment of inorganic pigments, treatment of dyed organosilicon compounds, etc., to achieve the effects of easy transportation and use, simple preparation process, and easy mass production

Active Publication Date: 2013-10-09
SHANGHAI DONGSHENG NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the addition of a certain amount of surfactants and wetting agents, it has certain influence and restrictions on its later application

Method used

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  • Dry grinding method of ultrafine heavy calcium carbonate
  • Dry grinding method of ultrafine heavy calcium carbonate
  • Dry grinding method of ultrafine heavy calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 99.5 kilograms 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 0.25 kilograms of sodium carbonate and 0.2 kilograms of polyethylene with a relative average molecular weight of 3500. Glycol, dry grinding in the grinding medium zirconia, while grinding, continuously add 0.05 kg of polydimethylsiloxane with a degree of polymerization of 2500, the addition is completed within 1.5 hours, the grinding is finished after 3 hours, and a small amount is removed by sieving After the particles are larger than 1000 mesh, 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 36.4% of the total mass.

Embodiment 2

[0025] Add 99.5 kilograms 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 0.299 kilograms of sodium carbonate and 0.2 kilograms of polyethylene with a relative average molecular weight of 2500. Glycol, dry grinding in the grinding medium zirconia, while grinding, continuously add 0.001 kg of polydimethylsiloxane with a polymerization degree of 1200, the addition is completed within 1 hour and 20 minutes, the grinding is finished after 1.5 hours, and sieved After removing a small amount of particles larger than 1000 mesh, an ultrafine 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 58.2% of the total mass.

Embodiment 3

[0027] Add 99.79 kilograms of 500-mesh heavy calcium carbonate coarse powder into the 3R3120 Raymond Mill of Qingyang County Anguang Superfine Powder Equipment Manufacturing Factory, and then add 0.15 kilograms of sodium carbonate and 0.05 kilograms of polyethylene with a relative average molecular mass of 2200. Diol, dry grinding in the grinding medium zirconia, while grinding, continuously add 0.01 kg of polydimethylsiloxane with a polymerization degree of 1800, the addition is completed within 1 hour, and the grinding is completed after 2 hours, and a small amount is removed by sieving After the particles are larger than 1000 mesh, 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 52.3% of the total mass.

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Abstract

The invention provides a dry grinding method of ultrafine heavy calcium carbonate which comprises the following steps: adding coarse powder of heavy calcium carbonate into a grinding device, adding a grinding auxiliary agent and a dispersant, grinding with a grinding medium, adding polydimethylsiloxane during grinding, and collecting the ultrafine heavy calcium carbonate. In the ultrafine heavy calcium carbonate obtained by the invention, the mass of particles with a particle size of less than 2 microns accounts for 35%-60% of the total mass. Compared with existing production technology of ultrafine heavy calcium carbonate, the method of the invention has a simple preparation process, facilitates large-scale production, and can greatly reduce the cost, and the obtained product is easy to transport and use.

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 Patents(China)
IPC IPC(8): C09C1/02C09C3/06C09C3/10C09C3/12
Inventor 施晓旦田雨
Owner SHANGHAI DONGSHENG NEW MATERIALS