Preparation method of heavy calcium carbonate and special sharpener

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...

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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

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