Method for wet modifying of ultrafine calcium carbonate

A technology of ultra-fine calcium carbonate and wet modification, which is applied in the direction of chemical instruments and methods, addition of inorganic compounds, fibrous fillers, etc., to avoid secondary agglomeration, improve efficiency, and improve lubricity

Inactive Publication Date: 2018-12-07
桂林永福恒达实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the calcium carbonate produced by the dry method can only reach a fine level. In the wet production, how to better prevent the powder from sticking, improve the dispersibility of the powder, and improve its toughness will be a very important issue.

Method used

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  • Method for wet modifying of ultrafine calcium carbonate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for wet modification of ultrafine calcium carbonate, comprising the following steps:

[0025] S1. Coarsely crushing and pulverizing the calcite raw material to obtain calcite powder of 100-200 mesh;

[0026] S2. Grinding with a micropowder mill, and sieving ultrafine powders with a particle size of <5 μm after the milling is completed;

[0027] S3. Add water to the ultrafine powder to form a slurry, the weight ratio of water and ultrafine powder is 80:45, use a wet grinder to grind, and add zirconia microbeads and modified powder to the wet grinder at the same time The bagasse pulp is ground, the weight ratio of the ultrafine powder slurry to the modified bagasse pulp is 3:45, the grinding time is 45min, and the temperature is 56°C;

[0028] S4. passing the slurry obtained after wet grinding through a vibrating sieve to obtain ultrafine calcium carbonate slurry;

[0029] S5. Pre-dry the ultrafine calcium carbonate slurry to a moisture content of 15-20%, and t...

Embodiment 2

[0032] A method for wet modification of ultrafine calcium carbonate, comprising the following steps:

[0033] S1. Coarsely crushing and pulverizing the calcite raw material to obtain calcite powder of 100-200 mesh;

[0034] S2. Grinding with a micropowder mill, and sieving ultrafine powders with a particle size of <5 μm after the milling is completed;

[0035] S3. Add water to the ultrafine powder to form a slurry, the weight ratio of water and ultrafine powder is 70:30, use a wet grinder to grind, and add zirconia microbeads and modified The bagasse pulp is ground, the weight ratio of the ultrafine powder slurry to the modified bagasse pulp is 2:30, the grinding time is 40min, and the temperature is 60°C;

[0036] S4. passing the slurry obtained after wet grinding through a vibrating sieve to obtain ultrafine calcium carbonate slurry;

[0037] S5. Pre-dry the ultrafine calcium carbonate slurry to a moisture content of 15-20%, and then put it into an air dryer for drying. Th...

Embodiment 3

[0040] A method for wet modification of ultrafine calcium carbonate, comprising the following steps:

[0041] S1. Coarsely crushing and pulverizing the calcite raw material to obtain calcite powder of 100-200 mesh;

[0042] S2. Grinding with a micropowder mill, and sieving ultrafine powders with a particle size of <5 μm after the milling is completed;

[0043] S3. Add water to the ultrafine powder to form a slurry, the weight ratio of water and ultrafine powder is 80:50, use a wet grinder to grind, and add zirconia microbeads and modified powder to the wet grinder at the same time The bagasse pulp is ground, the weight ratio of the ultrafine powder slurry and the modified bagasse pulp is 3:50, the grinding time is 50min, and the temperature is 50°C;

[0044] S4. passing the slurry obtained after wet grinding through a vibrating sieve to obtain ultrafine calcium carbonate slurry;

[0045] S5. Pre-dry the ultrafine calcium carbonate slurry to a moisture content of 15-20%, and ...

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Abstract

The invention discloses a method for wet modifying of ultra fine calcium carbonate, and the method comprises the following steps: pulverizing; milling by a micro-powder milling machine; wet grinding,adding of modified bagasse slurry; sieving; and drying. The method can well improve the dispersing property of the calcium carbonate, prevents agglomeration during the grinding and drying process, andat the same time helps to improve the toughness of a downstream product-paper to some extent.

Description

technical field [0001] The invention relates to a preparation method of calcium carbonate, in particular to a method for wet modification of ultrafine calcium carbonate. Background technique [0002] Heavy calcium carbonate is generally made by crushing natural carbonate minerals such as calcite, marble and limestone. Heavy calcium has the characteristics of high whiteness, good purity, and soft hue, so it is widely used in artificial floor tiles, rubber, plastics, etc. , papermaking, coatings, paints, inks, cables, construction supplies, food, medicine, textiles, feed, toothpaste and other industries, usually used as fillers or reinforcing agents. [0003] According to the average particle size (d) of calcium carbonate powder, calcium carbonate can be divided into particulate calcium carbonate (d>5μm), ultrafine calcium carbonate (1μm<d<5μm), fine calcium carbonate (0.1μm<d≤ 1μm), ultrafine calcium carbonate (0.02μm<d≤0.1μm) and ultrafine calcium carbonate (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/04C09C3/08C09C3/12D21H17/67D21H17/69
CPCC01P2006/22C09C1/021C09C3/006C09C3/041C09C3/043C09C3/08C09C3/12D21H17/675D21H17/69
Inventor 覃正文
Owner 桂林永福恒达实业有限公司
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