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A kind of mixed type papermaking pigment and preparation method thereof

A mixed-type, mixed slurry technology, applied in the field of papermaking pigments, can solve the problems of narrow particle size distribution range, agglomerated pulp lumps, etc., achieve the effects of narrow particle size distribution range, improve performance, and reduce the content of large particles

Active Publication Date: 2015-10-14
昌乐金晖矿物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to provide a kind of mixed-type papermaking pigment with narrow particle size distribution range and high solid content and its preparation method, to improve the flow performance of papermaking pigment, to improve the use performance of papermaking pigment, and to solve the problem of kaolin Solve the problem of agglomeration of pulp during foaming, simplify the papermaking pigment preparation process, and reduce production costs

Method used

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  • A kind of mixed type papermaking pigment and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0035] Calcium carbonate, washed kaolin and water are mixed to obtain a slurry with a solid content of 78%, and the above slurry is discharged to the buffer tank; the slurry in the buffer tank is subjected to open circulation grinding, that is, the slurry comes out of the buffer tank Finally, it enters the grinding equipment for grinding, and the ground slurry is transported back to the buffer tank by the delivery pump, and a dispersant is added during the grinding process. The amount of the dispersant added is 1.0% of the dry weight. When the ground slurry After the content of particles with a particle size of less than 2 μm is ≥95%, stop grinding; finally, sort the slurry after grinding to remove large particles: the slurry after grinding first enters the screening equipment for a sorting treatment, and then enters the centrifuge Machine for refined secondary sorting.

[0036] The main indicators of grade 95 paper-making pigments obtained by the above process are: the solid ...

Embodiment 2

[0038] Calcium carbonate, washed kaolin and water are mixed to obtain a slurry with a solid content of 76%; the mixed slurry is ground, and a dispersant is added during the grinding process, and the amount of the dispersant added is 0.3% of the dry weight ;When the content of particles with a particle size of less than 2 μm in the ground slurry is ≥65%, stop grinding; finally, sort the ground slurry to remove large particles, and the ground slurry first enters the screening equipment for First sorting treatment, and then into the centrifuge for refined secondary sorting treatment.

[0039] The main indicators of grade 65 paper-making pigments obtained by the above process are: the solid content of paper-making pigments is 75.8%, the weight ratio of calcium carbonate and kaolin is 95:5, the particle size is less than 2μm, the content is 66%, and the 45μm water sieve residue 0.003%.

Embodiment 3

[0041] Mix calcium carbonate, washed kaolin and water to obtain a slurry with a solid content of 80%, and discharge the above slurry to the buffer tank; carry out open circulation grinding on the slurry in the buffer tank, that is, the slurry comes out of the buffer tank Finally, it enters the grinding equipment for grinding, and the ground slurry is transported back to the buffer tank by the delivery pump, and a dispersant is added during the grinding process. The amount of the dispersant added is 1.5% of the dry weight. When the ground slurry After the content of particles with a particle size of less than 2 μm is ≥95%, stop grinding; finally, sort the slurry after grinding to remove large particles: the slurry after grinding first enters the screening equipment for a sorting treatment, and then enters the centrifuge Machine for refined secondary sorting.

[0042] The main indicators of grade 95 paper-making pigments obtained by the above process are: the solid content of pa...

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Abstract

The invention discloses mixed paper making pigment and a preparation method of the mixed paper making pigment. The paper making pigment comprises calcium carbonate, kaolin and water, and the solid content of the paper making pigment is 74 weight percent to 80 weight percent, wherein the weight ratio of the calcium carbonate to the kaolin is (70-95):(30-5). The preparation method of the mixed paper making pigment comprises the following steps that the calcium carbonate, the kaolin and the water are mixed in a pulp soaking groove, the solid content of the pulp obtained after the mixing is 74 weight percent to 80 weight percent, then, the mixed pulp is discharged into a buffer tank, the pulp in the buffer tank is ground, in addition, dispersing agents are added in the grinding process, the addition quantity of the dispersing agents is 0.2 percent to 1.5 percent of the weight of dry bases, the ground pulp is sorted, and large particles are removed. The paper making pigment and the preparation method of the paper making pigment provided by the invention have the advantage that the use performance of the paper making pigment is improved.

Description

technical field [0001] The invention relates to the technical field of papermaking pigments, in particular to a mixed papermaking pigment. [0002] The present invention also relates to a method for preparing the above mixed papermaking pigment. Background technique [0003] Ultrafine ground calcium carbonate (GCC) is widely used in the paper and latex products industry because of its most favorable price-performance ratio, especially in the paper industry, it is an important coating and filler. In the early stage of the development of GCC paper pigments, mud cake containing 20% ​​to 25% moisture is the main product form. At present, this product form is basically replaced by slurry and dry powder. GCC slurry is ground by wet method, and the particle size of calcium carbonate particles is ground from about 38 μm to below 2 μm, the solid content is 68wt% to 72wt%, and the particle size distribution is also wide, generally controlled at 0.4 μm to 2 μm, particles smaller than ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H19/38D21H19/40
Inventor 贺业成
Owner 昌乐金晖矿物科技有限公司
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