Method for preparing ultrafine calcium carbonate by wet method

An ultra-fine calcium carbonate, wet process technology, applied in the direction of calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc., to improve surface properties, avoid secondary agglomeration, and improve efficiency

Inactive Publication Date: 2018-11-06
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, and how to maintain the ultrafine calcium carbonate during the drying process of the filtered slurry is the key very important question

Method used

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  • Method for preparing ultrafine calcium carbonate by wet method

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Comparison scheme
Effect test

Embodiment 1

[0022] A method for wet preparation of ultrafine calcium carbonate, comprising the following steps:

[0023] S1. Coarsely crushing and pulverizing the calcite raw material to obtain calcite powder of 100-200 mesh;

[0024] S2. Grinding with a micropowder mill, and sieving ultrafine powders with a particle size of <5 μm after the milling is completed;

[0025] S3. Add water to the ultrafine powder to form a slurry, the weight ratio of water and ultrafine powder is 100:45, use a wet grinder to grind, and add zirconia microbeads and silane coupling to the wet grinder at the same time. Coupling agent, sodium pyrophosphate, friction silicon dioxide and phosphate diester salt are ground, the weight ratio of silane coupling agent, fatty acid polyoxyethylene ester and ultrafine powder is 0.3:0.6:45, the grinding time is 45min, and the temperature 56°C;

[0026] S4. passing the slurry obtained after wet grinding through a vibrating sieve to obtain ultrafine calcium carbonate slurry; ...

Embodiment 2

[0029] A method for wet preparation of ultrafine calcium carbonate, comprising the following steps:

[0030] S1. Coarsely crushing and pulverizing the calcite raw material to obtain calcite powder of 100-200 mesh;

[0031] S2. Grinding with a micropowder mill, and sieving ultrafine powders with a particle size of <5 μm after the milling is completed;

[0032] S3. Add water to the ultrafine powder to form a slurry, the weight ratio of water and ultrafine powder is 100:50, use a wet grinder to grind, and add zirconia microbeads and silane coupling to the wet grinder at the same time. Coupling agent, sodium pyrophosphate, friction silicon dioxide and phosphate diester salt are ground, the weight ratio of silane coupling agent, fatty acid polyoxyethylene ester and ultrafine powder is 0.2:1:50, the grinding time is 50min, and the temperature 60°C;

[0033] S4. passing the slurry obtained after wet grinding through a vibrating sieve to obtain ultrafine calcium carbonate slurry;

...

Embodiment 3

[0036] A method for wet preparation of ultrafine calcium carbonate, comprising the following steps:

[0037] S1. Coarsely crushing and pulverizing the calcite raw material to obtain calcite powder of 100-200 mesh;

[0038] S2. Grinding with a micropowder mill, and sieving ultrafine powders with a particle size of <5 μm after the milling is completed;

[0039] S3. Add water to the ultrafine powder to form a slurry, the weight ratio of water and ultrafine powder is 90:30, use a wet grinder to grind, and add zirconia microbeads and silane distillate to the wet grinder at the same time. Coupling agent, sodium pyrophosphate, friction silicon dioxide and phosphate diester salt are ground, the weight ratio of silane coupling agent, fatty acid polyoxyethylene ester and ultrafine powder is 0.5:0.5:30, the grinding time is 40min, and the temperature 50°C;

[0040] S4. passing the slurry obtained after wet grinding through a vibrating sieve to obtain ultrafine calcium carbonate slurry;...

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Abstract

The invention discloses a method for preparing ultrafine calcium carbonate by a wet method. The method comprises the following steps: crushing; grinding by a fine powder mill; wet grinding, adding a coupling agent and fatty acid ethoxylate; sieving; and drying. The method provided by the invention can improve the dispersion property of calcium carbonate well and prevent agglomeration during grinding and drying.

Description

technical field [0001] The invention relates to a method for preparing calcium carbonate, in particular to a method for preparing ultrafine calcium carbonate by a wet method. 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 carbon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/04C09C3/06C09C3/10C09C3/12C01F11/18
CPCC01F11/185C09C1/021C09C1/022C09C3/006C09C3/041C09C3/043C09C3/06C09C3/10C09C3/12
Inventor 覃正文
Owner 桂林永福恒达实业有限公司
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