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Chrysanthemum-like light calcium carbonate filler preparation method

A light calcium carbonate and chrysanthemum technology is applied in fiber raw material processing, textiles and papermaking, papermaking and other directions, which can solve the problems of long limestone calcination time, complicated process and high production cost, and achieves reduction of papermaking cost, simple process and improved retention. the effect of

Active Publication Date: 2019-04-23
DSSUN NEW MATERIAL SHANDONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this invention, limestone is calcined for a long time, and various whitening agents are used. One or two of ammonium phosphate and citrate are used as the crystal form control agent, and a dispersant is also used. The process is complicated and the production cost is high.

Method used

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  • Chrysanthemum-like light calcium carbonate filler preparation method
  • Chrysanthemum-like light calcium carbonate filler preparation method
  • Chrysanthemum-like light calcium carbonate filler preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The automatic mechanical vertical steel kiln is adopted, the limestone with a size of 30-60mm is selected, the coal-stone ratio is 80kg / T limestone, the calcination temperature is controlled between 1000°C, and the calcination time is 25h. Lime is digested in hot water at 80°C, and the mass ratio of lime to water is 1:6. Add water to the digested coarse pulp to adjust the concentration to 15%, first pass through a 100-mesh sieve, and then pass through a hydrocyclone to remove impurities to obtain a fine pulp. After the seminal pulp was aged for 24 hours, the temperature was lowered to 45°C. Pour the fine slurry into a carbonization tower, add 1‰ citric acid (dry relative to PCC) (concentration: 30%) as a crystal form control agent, and stir evenly. Ventilate for carbonization, the kiln gas concentration is 30%, and continuously detect the conductivity online during the carbonization process. When the conductivity reaches the minimum and then increases by 0.5mS / cm, stop...

Embodiment 2

[0035] The automatic mechanical vertical steel kiln is adopted, the limestone with a size of 30-60mm is selected, the coal-stone ratio is 80kg / T limestone, the calcination temperature is controlled at 1000°C, and the calcination time is 25h. Lime is digested in hot water at 80°C, and the mass ratio of lime to water is 1:6. Add water to the digested coarse pulp to adjust the concentration to 15%, first pass through a 100-mesh sieve, and then pass through a hydrocyclone to remove impurities to obtain a fine pulp. After the seminal pulp was aged for 24 hours, the temperature was lowered to 40°C. Pour the fine slurry into a carbonization tower, add 1.5‰ citric acid (dry relative to PCC) (concentration: 30%) as a crystal form control agent, and stir evenly. Ventilate for carbonization, the kiln gas concentration is 30%, and continuously detect the conductivity online during the carbonization process. When the conductivity reaches the minimum and then increases by 0.5mS / cm, stop th...

Embodiment 3

[0037] The automatic mechanical vertical steel kiln is adopted, the limestone with a size of 30-60mm is selected, the coal-stone ratio is 80kg / T limestone, the calcination temperature is controlled at 1000°C, and the calcination time is 25h. Lime is digested in hot water at 80°C, and the mass ratio of lime to water is 1:6. Add water to the digested coarse pulp to adjust the concentration to 15%, first pass through a 100-mesh sieve, and then pass through a hydrocyclone to remove impurities to obtain a fine pulp. After the seminal pulp was aged for 24 hours, the temperature was lowered to 35°C. Pour the fine slurry into a carbonization tower, add 2‰ citric acid (dry relative to PCC) (concentration: 30%) as a crystal form control agent, and stir evenly. Ventilate for carbonization, the kiln gas concentration is 30%, and continuously detect the conductivity online during the carbonization process. When the conductivity reaches the minimum and then increases by 0.5mS / cm, stop the ...

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Abstract

The invention discloses a chrysanthemum-like light calcium carbonate filler preparation method, which comprises: 1, adding calcium hydroxide refining slurry into a carbonization tower, adding a crystal form controlling agent, and mixing uniformly; 2, introducing kiln gas, carbonizing, onlinely detecting the conductivity during the carbonization, stopping the gas introducing after the conductivityreaches the minimum value and then is increased by 0.3-0.5 mS / cm, introducing the gas after 5-30 min, and stopping the carbonization after the conductivity is increased to 0.7-1.0 mS / cm to obtain a cooked slurry; and 3, adding a crystal form modifier to the cooked slurry, uniformly mixing, and removing impurities to obtain the chrysanthemum-like light calcium carbonate filler. According to the present invention, the prepared chrysanthemum-like light calcium carbonate filler has high specific surface area and high sinking body, is used for papermaking filling, can effectively improve the bulkness, the opacity, the whiteness and other indexes of paper, has the increased retention rate, and can save fiber consumption so as to reduce the papermaking cost.

Description

technical field [0001] The invention relates to the field of papermaking filler preparation, in particular to a preparation method of chrysanthemum-like light calcium carbonate filler. Background technique [0002] Light calcium carbonate is one of the most commonly used fillers in the paper industry. Using fillers instead of paper fibers can reduce production costs and improve the optical properties, printing properties and appearance of paper. As an important inorganic chemical raw material, light calcium carbonate may have different crystal shapes such as cubes, spindles, needles, chains, and flakes due to different preparation processes. The light calcium carbonate produced by the ordinary carbonization method is mostly spindle-shaped or needle-rod-shaped, with a wide range of particle size distribution, coarse particles, poor dispersion, and poor hiding power. The chrysanthemum-like light calcium carbonate grows radially with the seed crystal as the core. This structur...

Claims

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Application Information

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IPC IPC(8): D21H17/67
CPCD21H17/675
Inventor 施晓旦刘莹傅斌
Owner DSSUN NEW MATERIAL SHANDONG
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