Method for producing super fine calcium carbonate

An ultra-fine calcium carbonate, wet process technology, applied in chemical instruments and methods, inorganic pigment treatment, dyed organosilicon compound treatment, etc., to achieve the effect of improving surface properties, speeding up, and improving dispersion properties

Inactive Publication Date: 2018-12-04
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 producing super fine calcium carbonate

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Experimental program
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Effect test

Embodiment 1

[0022] A method for wet production of superfine 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, frictional silicon dioxide and phosphodiester salt are ground, and the weight ratio of silane coupling agent, sodium pyrophosphate, frictional silicon dioxide, phosphodiester salt and ultrafine powder is 0.3: 0.08:0.04:0.08:45, grinding time 45min, temperature 56℃;

[0026] S4. passing the slurry obtained after wet grinding through a vibrating sieve to obtain u...

Embodiment 2

[0029] A method for wet production of superfine 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, frictional silicon dioxide and phosphate diester salt are ground, and the weight ratio of silane coupling agent, sodium pyrophosphate, frictional silicon dioxide, phosphodiester salt and ultrafine powder is 0.2: 0.05:0.05:0.1:50, grinding time 50min, temperature 60℃;

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

Embodiment 3

[0036] A method for wet production of superfine 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, frictional silicon dioxide and phosphoric acid diester salt are ground, and the weight ratio of silane coupling agent, sodium pyrophosphate, frictional silicon dioxide, phosphoric acid diester salt and ultrafine powder is 0.5: 0.1:0.03:0.05:30, grinding time 40min, temperature 50℃;

[0040] S4. passing the slurry obtained after wet grinding through a vibrating...

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Abstract

The invention discloses a method for producing super fine calcium carbonate by a wet method. The method comprises the following steps: carrying out crushing; carrying out grinding by using a micro-powder pulverizer; carrying out grinding by a wet method; adding a coupling agent and a dispersing agent; carrying out sieving; and carrying out drying. According to the invention, the dispersing performance of the calcium carbonate can be well improved, and agglomeration in the grinding and drying processes can be prevented.

Description

technical field [0001] The invention relates to a preparation method of calcium carbonate, in particular to a method for wet production 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 (d≤...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/04C09C3/06C09C3/08C09C3/12
CPCC01P2006/22C09C1/021C09C3/041C09C3/06C09C3/08C09C3/12
Inventor 覃正文
Owner 桂林永福恒达实业有限公司
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