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A kind of production technology of heavy calcium carbonate

A heavy calcium carbonate, production process technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of yellowish color of heavy calcium carbonate finished products, large waste of modifiers, low whiteness, etc., to achieve low cost, The effect of convenient preparation and simple process operation

Active Publication Date: 2017-08-25
SICHUAN YIXIN NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the modifying agent will decompose and deteriorate when it acts at 140°C, and the finished product of heavy calcium carbonate obtained by this method is yellow in color and has a very low whiteness; meanwhile, the heavy calcium carbonate is modified in a liquid state, The waste of modifier is very large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: a kind of production technology of heavy calcium carbonate, it comprises the following steps:

[0021] S1. Crushing: choose natural marble as raw material, send it to jaw crusher for crushing, crush the raw material to particle size ≤ 4mm, and then use sand making machine and linear vibrating screen to make marble powder below 40 mesh, and set aside;

[0022] S2. Soak slurry: Add water and dispersant to the crushed marble powder, soak the slurry at 20°C for 25 minutes, then add advanced mixed stearic acid surface treatment agent, mix evenly and soak for 30 minutes to obtain slurry; the marble The weight ratio of powder, water and dispersant is 100:300:1; The molecular formula of described advanced mixed stearic acid is: R-O-(CH 2 CH 2 O) n -H, in the formula, R is a dodecyl group, and n is an integer in 3. The weight ratio of the marble powder and the advanced mixed stearic acid is 43:1;

[0023] S3. Wet grinding: input the slurry into a grinder for wet...

Embodiment 2

[0026] Embodiment 2: a kind of production technology of heavy calcium carbonate, it comprises the following steps:

[0027] S1. Crushing: choose natural marble as raw material, send it to jaw crusher for crushing, crush the raw material to particle size ≤ 4mm, and then use sand making machine and linear vibrating screen to make marble powder below 40 mesh, and set aside;

[0028] S2. Soak slurry: add water and dispersant to the crushed marble powder, soak the slurry at 45°C for 40 minutes, then add advanced mixed stearic acid surface treatment agent, mix well and soak for 60 minutes to obtain slurry; the marble The weight ratio of powder, water and dispersant is 100: 400: 1.5; The molecular formula of described senior mixed stearic acid is: R-O-(CH 2 CH 2 O) n -H, in the formula, R is a dodecyl group, and n is an integer in 16. The weight ratio of the marble powder and the advanced mixed stearic acid is 58:1;

[0029] S3. Wet grinding: input the slurry into a grinder for we...

Embodiment 3

[0032] Embodiment 3: a kind of production technology of heavy calcium carbonate, it comprises the following steps:

[0033] S1. Crushing: choose natural marble as raw material, send it to jaw crusher for crushing, crush the raw material to particle size ≤ 4mm, and then use sand making machine and linear vibrating screen to make marble powder below 40 mesh, and set aside;

[0034] S2. Soak slurry: Add water and dispersant to the crushed marble powder, soak the slurry for 30 minutes at 32°C, then add advanced mixed stearic acid surface treatment agent, mix evenly and soak for 42 minutes to obtain slurry; the marble The weight ratio of powder, water and dispersant is 100:320:1.2; The molecular formula of described advanced mixed stearic acid is: R-O-(CH 2 CH 2 O) n -H, in the formula, R is a dodecyl group, and n is an integer in 5. The weight ratio of the marble powder and the advanced mixed stearic acid is 48:1;

[0035] S3. Wet grinding: input the slurry into a grinding mach...

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PUM

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Abstract

The invention discloses a production process of heavy calcium carbonate, which comprises the following steps: S1. crushing, S2. foaming slurry, S3. wet grinding, S4. drying, and S5. modification. In the present invention, a high-grade mixed stearic acid surface treatment agent is added in the foaming process, and the grinding in the later stage is used. The traditional grinding adopts secondary grinding, but the grinding effect will not be improved, and flocculent precipitation is easy to occur. In order to improve the effect , generally increase the number of times of grinding, the present invention can improve the effect of grinding by adding a high-grade mixed stearic acid surface treatment agent through one grinding, and will not produce flocculent precipitation; the present invention adopts dry modification, and the collected The heavy calcium carbonate powder is modified by modifier again, and the modified heavy calcium carbonate finally obtained avoids the problem of large amount of modifier waste when liquid modification is performed; the process of the present invention is simple and convenient to operate and convenient to prepare , low cost and suitable for industrialized large-scale production.

Description

technical field [0001] The invention relates to the field of inorganic non-metallic mineral materials, in particular to a production process of heavy calcium carbonate. Background technique [0002] Ground calcium carbonate, also known as ground calcium carbonate, is a powder product made of natural calcite, marble, chalk, etc., which is mechanically crushed and ground to a certain fineness. It is generally called finely ground calcium carbonate (FGCC) internationally. In order to distinguish precipitated calcium carbonate in the paper industry, GCC and PCC are used for abbreviation respectively. Generally, products with an average particle size below 12 μm are called heavy fine calcium carbonate to distinguish general heavy calcium carbonate. Calcium carbonate products are divided into special calcium for granite, special calcium for sealant, special calcium for rubber, special calcium for papermaking, special calcium for plastics, special calcium for paint and coating, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
Inventor 彭贵明陈华平雷礼强李林富王晓洪
Owner SICHUAN YIXIN NEW MATERIAL CO LTD
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