Self-retention heavy calcium carbonate and preparation method thereof

A technology of calcium carbonate and calcite, applied in the direction of calcium carbonate/strontium/barium, fibrous fillers, etc., can solve the problems of affecting the bulk of the paper sheet, the decrease of the first pass retention rate, the decrease of the retention rate, etc., and achieve fixed equipment investment. The effect of less bulk, improved bulk, and low manufacturing cost

Inactive Publication Date: 2011-12-14
刘立新
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But adopt existing method to prepare the ground calcium carbonate that is used as the filler in slurry, there are two major problems such as poor retention and influence on paper bulk. For example, adopt grinding ground calcium carbonate to make filler and adopt light calcium carbonate Compared with fillers, under the same conditions, the first-pass retention rate decreases by 5-8%, and the thickness of the paper sheet decreases by an average of 2-4 μm, and the decrease in the first-pass retention rate causes the retention rate of other chemicals to decrease. , its consumption increases, so that ordinary ground heavy calcium carbonate still cannot replace light calcium carbonate and other fillers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The particles of the ground calcium carbonate product of the present embodiment are aggregated, and the average particle diameter D50 is 7.2 μm; D25 is 2.8 μm.

[0018] Preparation: (1) Add 3.5kg of sodium polyacrylate dispersant to 300kg of water to dilute, under stirring, add 700kg of 325 mesh calcite powder into the above aqueous solution containing sodium polyacrylate, and stir evenly to obtain calcite pulp;

[0019] (2) Put the calcite slurry obtained in step (1) into a continuous agitating grinder, and put 100 kg of abrasive—zirconia balls into the machine, and grind continuously until the D50 is 1.8 μm;

[0020] (3) Put the calcite slurry obtained in step (2) into the modification machine, which has put 100 kg of modifier polyacrylamide aqueous solution (including 0.25 kg of polyacrylamide) and 300 kg of water into the modification machine, and continuously stir until completely Until the aggregation, the self-retaining ground ground calcium carbonate slurry with...

Embodiment 2

[0024] The particles of the ground calcium carbonate product in this embodiment are in an aggregated form, and the average particle diameter D50 is 6.6 μm; D25 is 2.6 μm.

[0025] Preparation: (1) Add 4.5 kg of sodium hexametaphosphate into 400 kg of water, stir until completely dissolved, add 800 kg of 325 mesh calcite powder into the above aqueous solution containing sodium hexametaphosphate, and stir to obtain calcite slurry;

[0026] (2) Put the calcite slurry obtained in step (1) into a continuous agitating grinder, and put 120 kg of grinding agent—zirconia balls into the machine, and grind continuously until the D50 is 2.0 μm;

[0027] (3) Put the ground calcite slurry in step (2) into the modification machine, and put 150kg of modifier polydiallyldimethyl ammonium chloride aqueous solution (containing polydiallyl di Methyl ammonium chloride 0.3 kg) and water 200kg, stirring continuously until completely aggregated. A self-retaining ground ground calcium carbonate slurr...

Embodiment 3

[0031] The particles of the ground calcium carbonate product in this embodiment are in an aggregated form, and the average particle diameter D50 is 7.7 μm; D25 is 2.9 μm.

[0032] Preparation: (1) Add 3.5 kg of sodium polyacrylate dispersant to 300 kg of water to dilute, under stirring, add 700 kg of 325 mesh calcite powder to the above aqueous solution containing sodium polyacrylate, and stir evenly to obtain calcite slurry;

[0033] (2) Put the calcite slurry obtained in step (1) into a continuous agitating grinder, and put 100 kg of grinding agent—zirconia balls into the machine, and grind continuously until the D50 is 1.6 μm;

[0034] (3) Put the calcite pulp obtained in step (2) into the modification machine, in which 175kg of modifier acrylamide-acrylic acid copolymer aqueous solution (containing 0.35kg of acrylamide-acrylic acid copolymer) and 300kg of water , Stirring continuously until completely aggregated, to obtain a self-retention grinding ground calcium carbonate...

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Abstract

The invention discloses self-retention heavy calcium carbonate and a preparation method thereof. Particles of the self-retention heavy calcium carbonate are in an aggregation form, the particle diameter D50 is equal to 5 to 10 microns, and D25 is more than or equal to 2.5 microns. The preparation method comprises the following steps of: (1) mixing and stirring calcite mineral powder, dispersant and water uniformly to obtain calcite mineral powder slurry; (2) delivering the mineral powder slurry obtained in the step (1) to a stirring grinder, and continuously grinding the mineral powder slurrytill the average particle diameter is 1.6 to 2.4 microns; and (3) transferring the slurry obtained after grinding in the step (2) into a modifying machine filled with a modifying agent, and continuously stirring the slurry till the slurry is fully aggregated. The self-retention heavy calcium carbonate product serving as a filling agent in papermaking pulp can fully replace the filling material such as talcpowder, light calcium carbonate and the like.

Description

technical field [0001] The invention relates to a grinding heavy calcium carbonate and a preparation method thereof, in particular to a self-retention heavy calcium carbonate and a preparation method thereof. Background technique [0002] Grinding ground calcium carbonate used as pulp filler and coating pigment in the paper industry is currently made from natural calcite as raw material, which is prepared by cracking, finely crushing, and wet grinding. Due to its high whiteness and low price, it has great application potential in the paper industry. But adopt existing method to prepare the ground calcium carbonate that is used as the filler in slurry, there are two big problems such as retain poorly, affect paper sheet bulkiness, for example, adopt grinding ground calcium carbonate to make filler and adopt light calcium carbonate Compared with fillers, under the same conditions, the first-pass retention rate decreases by 5-8%, and the thickness of the paper sheet decreases ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18C09C1/02
Inventor 刘立新
Owner 刘立新
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