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Preparation method of alkali-recovery white mud refined calcium carbonate filler with low AKD adsorption rate

A calcium carbonate filler, adsorption rate technology, applied in fiber raw material processing, inorganic compound addition, textiles and papermaking, etc., can solve the problems of limited performance improvement, low total calcium carbonate, and inability to fully grow fine particles, and reduce porosity. efficiency, modification of microstructure, and the effect of increasing particle size

Inactive Publication Date: 2019-08-09
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the total amount of newly generated calcium carbonate in this part is relatively small, when the white mud calcium carbonate is used as the nucleus for growth, the fine particles cannot be fully grown, so the content of fine particles cannot be significantly reduced, thereby improving its performance. limited

Method used

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Examples

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Effect test

preparation example Construction

[0019] A kind of preparation method of low AKD adsorption rate alkali recovery white mud refined calcium carbonate filler, comprises the steps:

[0020] 1) Sieving the lime mud with a mass concentration of 20%-30% obtained in the alkali recovery section, and the mesh number of the sieve is 600-1000 mesh.

[0021] 2) Grinding the sieved white mud, and the obtained white mud has an average particle size of 2-8 μm.

[0022] 3) Add a certain amount of calcium oxide solid and calcium ion chelating agent to the white mud after grinding, the calcium oxide addition is 50%-150% of the absolute dry weight of white mud, and the calcium ion chelating agent is sodium hydroxyethylidene diphosphonate, Maleic acid-acrylic acid copolymer or the mixture of the two, the addition amount is 1‰-1% of the absolute dry mass of white mud, and then a certain amount of water is added to control the mass concentration of calcium hydroxide after digestion to 5%-15%. 0.5-2h; at a temperature of 20-60°C, i...

Embodiment 1

[0025] 1. Prepare materials

[0026] Alkali recovery white mud mass concentration 20%.

[0027] 2. Screening

[0028] The mesh size of the screen is 600 mesh, and equipment such as rotary vibrating screen is used to remove large particles and coarse slag.

[0029] 3. Grinding

[0030] Grinding with a vertical grinder, the average particle size of white clay particles after grinding is controlled at 2 μm.

[0031] 4. Homogeneous flocculation and carbonization

[0032] Add calcium oxide solid to the white mud system before carbonization, its mass fraction is 50% (calculated by the dry mass of white mud), and sodium hydroxyethylidene diphosphonate is added, and the mass fraction is 1‰ (calculated by dry weight of white mud ), add a certain amount of water, control the mass concentration of calcium hydroxide after digestion to be 5% (in terms of the overall mass of the carbonization system), and digest for 0.5h; at a temperature of 20°C, feed carbon dioxide into normal pressur...

Embodiment 2

[0037] 1. Prepare materials

[0038] The mass concentration of white mud recovered by alkali is 22%.

[0039] 2. Screening

[0040] The sieve mesh is 800 mesh, and equipment such as rotary vibrating screen is used to remove large particles and coarse slag.

[0041] 3. Grinding

[0042] Grinding with a vertical grinder, the average particle size of white clay particles after grinding is controlled at 5 μm.

[0043] 4. Homogeneous flocculation and carbonization

[0044] Add calcium oxide solid to the white mud system before carbonization, and its mass fraction is 100% (calculated by the absolute dry mass of white mud), and add maleic acid-acrylic acid copolymer, and the mass fraction is 5‰ (calculated by the absolute dry weight of white mud ), add a certain amount of water, control the mass concentration of calcium hydroxide after digestion to be 10% (in terms of the overall mass of the carbonization system), and digest for 1.5h; at a temperature of 40°C, feed carbon dioxide...

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Abstract

The invention discloses a preparation method of an alkali-recovery white mud refined calcium carbonate filler with low AKD adsorption rate. The preparation method comprises the steps: firstly, screening white mud obtained in an alkali recovery section; secondly, conducting grinding treatment on the white mud obtained after screening; finally, adding calcium oxide solid and a calcium ion chelatingagent into the white mud obtained after grinding, adding a certain amount of water, controlling the mass concentration of the digested calcium hydroxide to be 5%-15% and executing digestion 0.5-2 hours; at the temperature of 20-60 DEG C, introducing carbon dioxide to control the system pressure at 0-0.2 MPa, meanwhile executing stirring at the stirring speed is 200-600 rpm, and executing carbonization until the pH value of the white mud system is 8-10, wherein the obtained product is the alkali-recovery white mud refined calcium carbonate filler with low AKD adsorption rate. According to the method, the content of calcium hydroxide contained in the white mud is optimized, so that the content of tiny particles of the calcium carbonate filler prepared by carbonizing and refining the white mud is controlled, the porosity of the calcium carbonate filler is reduced, the quality of the calcium carbonate filler is improved, and the filling application performance of the calcium carbonate filler is improved.

Description

technical field [0001] The invention belongs to the field of waste utilization in the papermaking industry, and in particular relates to a preparation method of a low AKD adsorption rate alkali recovery white mud refined calcium carbonate filler. Background technique [0002] White mud is a by-product of the alkali recovery section of the paper industry, and its main component is calcium carbonate. The traditional way to deal with lime mud is direct discharge or landfill treatment, which will cause serious environmental pollution problems. In order to realize resource utilization of lime mud, the paper industry has made a lot of efforts, such as CN201210044136.3, CN201210549277.0 and so on. However, it has been found in the production practice that when the lime mud obtained from the alkali recovery section is used for paper filling, the paper sizing efficiency will be greatly reduced. In order to reduce the impact of white mud refined calcium carbonate as a filler on the ...

Claims

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Application Information

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IPC IPC(8): D21H17/67D21H17/69D21H17/64
CPCD21H17/64D21H17/675D21H17/69
Inventor 王建徐耀威王志杰刘敏孙健鹏刘泽覃邵心怡
Owner SHAANXI UNIV OF SCI & TECH
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