Process for preparing flaky heavy calcium carbonate

A heavy calcium carbonate, flake technology, applied in the direction of calcium carbonate/strontium/barium, dyeing physical treatment, etc., can solve problems such as environmental pollution, and achieve the effect of low cost

Inactive Publication Date: 2002-07-24
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flaky calcium carbonate powder produced at present is flaky light calcium carbonate, and the easiest method is one-step method such as Japanese patent flat 2-184519 and Chinese patent CN1080909A, but the former uses a toxic crystal f

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0007] The method for preparing flaky heavy calcium carbonate provided by the present invention is: selecting structural alteration type calcite, and manufacturing according to the following steps:

[0008] The raw materials are crushed by a crusher and then coarsely ground to 400 mesh with a Raymond mill.

[0009] The raw material after rough grinding was prepared into a slurry having a concentration of 65 wt%.

[0010] Using peeling machine for wet ultra-fine grinding, using zirconia ball as grinding medium, it is divided into 7 levels of grinding, from level 1 to level 7, the quality of grinding medium φ0.8mm-1.2mm ball and φ1.5mm-2mm ball The ratio is 1:3, 1:2.5, 1:2, 1:1.5, 1:1, 1.5:1, 2:1. After grinding for 45 minutes, a flake-shaped heavy calcium carbonate with a particle size of less than 2 microns and a content of 94% is obtained, and the diameter-to-thickness ratio of the flakes is greater than 5:1.

[0011] The invention adopts a mechanical method to prepare, has low c...

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Abstract

A process for preparing flaky heavy calcium carbonate includes choosing altered calcite or coarse-grain marble, pulverizing, preparing slurry, superfine ball grinding with zirconium (or aluminium) oxide balls with diameter of 0.5-1.2 mm and 1.5-2 mm in a ratio of (1-2):(1-3) for 30-60 min, pressing filtering and drying. Its advantages are low cost, no toxicity and no environmental pollution.

Description

technical field [0001] The invention relates to a preparation method of calcium carbonate powder, in particular to a preparation method of flaky ground calcium carbonate. Background technique [0002] Calcium carbonate powder can be used as a filler in papermaking, plastics, rubber, coatings, and adhesives to enhance mechanical and physical properties. The flaky calcium carbonate powder can improve the surface gloss and flatness of the product, especially in the paper industry, it can replace the flaky washed kaolin and be used as a top coating for copper plates and white papers. Calcium carbonate powder can be divided into two categories according to different preparation methods, one is prepared by chemical methods, called light calcium carbonate; the other is prepared by mechanical grinding method, called heavy calcium carbonate, Such as patent CN1161996A, its technological process is: 1, dry crushing and grinding of raw materials, 2, slurry mixing and dispersion, 3, wet...

Claims

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Application Information

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IPC IPC(8): C01F11/18C09C3/04
Inventor 张德沈上越李珍潘铁虹周明
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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