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Superfine ground calcium carbonate and preparation method thereof

A heavy calcium carbonate, mass ratio technology, applied in fibrous fillers, dyed high molecular organic compound treatment, dyed low molecular organic compound treatment, etc., can solve the problem of affecting the whiteness and electrical insulation of heavy calcium products, and low grinding efficiency , iron filings pollution and other issues, to achieve the effects of pollution-free fine production, improved grinding efficiency, and increased output

Active Publication Date: 2022-07-22
JIANGXI GUANGYUAN CHEM +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Since the industrial production of heavy calcium carbonate (hereinafter referred to as heavy calcium carbonate), the ball milling process has been one of the main process technologies for the production of ultrafine heavy calcium carbonate (generally D97≤10μm heavy calcium carbonate is called ultrafine heavy calcium carbonate) The heavy calcium products produced by the ball milling process have the characteristics of less coarse particles, reasonable particle size distribution, and good dispersion. They have obvious technical advantages in downstream applications compared with other process grinding products. However, due to the low grinding efficiency of the traditional heavy calcium ball milling process (Can only process heavy calcium powder with an average particle size of 5 μm) High energy consumption, low output, and the problems of magnetic substances are gradually replaced by subsequent processes such as ring roller mills and ultra-fine vertical roller mills. Roller mills, vertical roller mills and other equipment all have iron filings pollution in the product, which affects the whiteness and electrical insulation of heavy calcium products

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  • Superfine ground calcium carbonate and preparation method thereof

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[0025] The invention provides a preparation method of ultrafine heavy calcium carbonate, comprising the following steps;

[0026] Mixing the calcite particles, water and a grinding aid to obtain a mixture; the grinding aid includes polyethylene glycol, diethylene glycol and a titanate coupling agent;

[0027] The mixture is ball-milled to obtain a ball-milled material; the grinding medium of the ball-milling is Al 2 O 3 Ceramic balls or zirconia balls, the lining of the ball mill is Al 2 O 3 Full ceramic lining or chrome-nickel alloy lining;

[0028] The ball milled material is classified to obtain the ultrafine heavy calcium carbonate.

[0029] In the present invention, unless otherwise specified, the raw materials used are all commercially available products in the field.

[0030] In the present invention, calcite particles, water and a grinding aid are mixed to obtain a mixture; the grinding aid includes polyethylene glycol, diethylene glycol and a titanate coupling ag...

Embodiment 1

[0060] The cleaned and crushed calcite particles (2-3mm) are first fed into a screw with a length of 1.5m for premixing. In this section of the feeding screw, 10wt% of the calcite input amount of water is metered at a constant speed, and at the same time, the pre-mixed water is metered. Good calcite particles feed 0.2% dry weight composite grinding aid, grinding aid ratio polyethylene glycol: diethylene glycol: triethanolamine chelate of bis(dioctyl pyrophosphate acyloxy) ethylene titanate The mixture is 1:1.5:0.1, in which the weight-average molecular weight of polyethylene glycol is 400. The premixed material is fed into a 2.5m-long two-stage helix so that the material particles are fully wetted and covered by water and grinding aids, and mixed. The uniform material is fed into the alumina ceramic-lined ball mill with a diameter of 2.2m and a length of 7m. The filling rate of alumina balls is 32%. :3:2:1, the ground material is drawn out of the mill by negative pressure air ...

Embodiment 2

[0074] The cleaned and crushed calcite particles (2-3mm) are first fed into a screw with a length of 1.5m for premixing. In this section of the feeding screw, the calcite feeding amount of 4wt% of water is metered at a constant speed, and at the same time, the pre-mixed water is metered. Good calcite particles feed 0.2% dry weight composite grinding aid, grinding aid ratio polyethylene glycol: diethylene glycol: triethanolamine chelate of bis(dioctyl pyrophosphate acyloxy) ethylene titanate The mixture is 1:1.5:0.1, in which the weight-average molecular weight of polyethylene glycol is 400. The premixed material is fed into a 2.5m-long two-stage helix so that the material particles are fully wetted and covered by water and grinding aids, and mixed. The uniform material is fed into the alumina ceramic-lined ball mill with a diameter of 2.2m and a length of 7m. The filling rate of alumina balls is 32%. :3:2:1, the ground material is drawn out of the mill by negative pressure air...

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Abstract

The invention provides superfine ground calcium carbonate and a preparation method thereof, and belongs to the technical field of ground calcium carbonate. Mixing calcite particles, water and a grinding aid to obtain a mixture; the grinding aid comprises polyethylene glycol, diethylene glycol and a titanate coupling agent; carrying out ball milling on the mixture to obtain a ball-milled material; a grinding medium of the ball mill is an Al2O3 ceramic ball or a zirconia ball, and a lining of the ball mill is an Al2O3 full-ceramic lining or a chromium-nickel alloy lining; and grading the ball-milled material to obtain the superfine heavy calcium carbonate. The ball-milled lining is an Al2O3 full-ceramic lining or a chromium-nickel alloy lining, so that the situation that the product is polluted due to the fact that scrap iron of a traditional iron lining and a steel ball is brought in is effectively avoided, the whiteness of the product and the low iron impurity content are guaranteed, the influence on the whiteness of calcium carbonate is small, the iron impurity content is low, and the problems that the whiteness is influenced by a traditional dry ball-milling process, and the product quality is poor are solved. And the product has high magnetic substance content (iron scrap pollution).

Description

technical field [0001] The invention relates to the technical field of heavy calcium carbonate, in particular to an ultrafine heavy calcium carbonate and a preparation method thereof. Background technique [0002] Since the industrial production of heavy calcium carbonate (hereinafter referred to as heavy calcium), the ball milling process has always been one of the main process technologies for the production of ultrafine heavy calcium carbonate (generally heavy calcium carbonate with D97≤10μm is called ultrafine heavy calcium carbonate). , The heavy calcium products produced by the ball milling process have the characteristics of less coarse particles, reasonable particle size distribution, and good dispersibility. They have obvious technical advantages in downstream applications and other grinding products. However, due to the traditional heavy calcium ball milling process, the grinding efficiency is low. (Only heavy calcium powder with an average particle size of 5μm can...

Claims

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Application Information

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IPC IPC(8): C09C1/02C09C3/04C09C3/08C09C3/10
CPCC09C1/021C09C3/041C09C3/08C09C3/10C09C3/006C01P2004/61C01P2006/60
Inventor 张晓明肖毓秀周峰邓鑫林敏
Owner JIANGXI GUANGYUAN CHEM
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