Preparation method of heavy calcium carbonate and special sharpener

A technology of heavy calcium carbonate and heavy calcium carbonate powder, which is applied in the fields of calcium carbonate/strontium/barium, grain processing, etc., can solve problems affecting environmental cleanliness, waste of raw materials, and increased power consumption, so as to ensure the safety of personnel in operation, Improve the working environment and ensure the effect of normal operation

Inactive Publication Date: 2007-09-19
GOLD EAST PAPER JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. A large amount of heat is generated during the grinding process, causing the surface temperature of the product and equipment to rise above 90°C, which affects the preparation and subsequent use of the coating, and at the same time causes the ambient temperature to rise, as high as 50°C in summer; and there are burns to employees during production operations Potential safety hazards seriously affect the operation of equipment and the safety of personnel operations
[0004] 2. A large amount of unqualified products will be discharged during the grinding process, resulting in waste of raw materials, increasing power consumption, and affecting environmental cleanliness

Method used

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  • Preparation method of heavy calcium carbonate and special sharpener
  • Preparation method of heavy calcium carbonate and special sharpener
  • Preparation method of heavy calcium carbonate and special sharpener

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The 325 mesh heavy calcium carbonate dry powder is soaked into a slurry with a solid content of 70-74%, and the slurry is fully stirred to make the slurry have good fluidity. The slurry is pumped to three series wet grinding equipment for three-stage grinding. The unqualified products produced during the grinding process are returned to the first mill for cyclic grinding by the circulation system. When the surface of the equipment heats up to 40°C, the cooling system is turned on to cool down, and after the third mill is tested that the product particle size reaches the standard, the slurry circulation is stopped to stabilize production. The qualified product has a solid content of 76.0% and a particle size of less than 2μm with a content of 95%. The product temperature is 55°C, and the surface temperature of the mill is 28°C, reducing the emission of unqualified products by 5-8 tons.

Embodiment 2

[0028] A special grinding device used in the method for preparing heavy calcium carbonate according to the present invention includes a grinding cavity 1 and a stirrer 2 arranged in the grinding cavity 1. The volume of the grinding chamber is 7.5~8.5m 3 , The volume of the jacket is 0.3~0.5m 3 A jacket 3 for cooling the grinding equipment is provided on the outside of the grinding cavity 1, and the cooling water provided by the cooling system 4 flows through the jacket 3 and then returns to the cooling system 4. The cooling system 4 is equipped with a cooling water tower 41 and a cooling water pipe 42, and the cooling water pipe 42 is connected in series with the grinding equipment. A circulation system 5 is provided at the product outlet of the grinding cavity 1 to return the unqualified products to the grinding cavity 1 for cyclic grinding. The work of the circulatory system is controlled by valves.

[0029] A total of three sets of special wet mills are used, which are applied ...

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Abstract

The present invention discloses a preparation method of large calcium carbonate and a special grinding equipment thereof. The preparation method comprises the steps of that: the large calcium carbonate powder is prepared into serum and then is send to the wet grinding equipment to be grinded by a plurality of stages; the defective products generated in the grinding process is returned, by a circulating system, to the feeding system to be regrinded; when the surface temperature of the wet grinding equipment rises up to a certain temperature, the cooling system is started to drop in temperature; the acceptable products are obtained after multistage grinding. The special grinding equipment comprises a grinding chamber, an agitator arranged inside of the grinding chamber and a cooling jacket arranged outside of the grinding chamber, wherein the cooling water from the cooling system flows across the cooling jacket and then returns to the cooling system. The heat generated in the grinding process can be taken away by the cooling water in the cooling jacket, so that the ambient temperature can be efficiently improved, the number of defective product is reduced, the raw material is saved and the cost is reduced.

Description

1. Technical Field [0001] The invention relates to a heavy calcium carbonate, in particular to a method for preparing heavy calcium carbonate for papermaking and its special grinding equipment. 2. Background technology [0002] With the increase in market demand for cultural paper, heavy calcium carbonate can meet the operating requirements of high-speed paper machines due to its low price, higher whiteness quality, better fluidity and operability. The largest amount of inorganic pigments. In the existing grinding production of heavy calcium carbonate, grinding equipment is used to grind the slurry prepared from heavy calcium carbonate powder. The equipment includes a grinding cavity and a stirrer arranged in the grinding cavity. This kind of grinding equipment has the following disadvantages in the production of heavy calcium carbonate: [0003] 1. A large amount of heat is generated during the grinding process, causing the surface temperature of the product and equipment to ris...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B02C19/00B02C23/00
Inventor 戴东昌
Owner GOLD EAST PAPER JIANGSU
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