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Process for preparing ultrafine calcium carbonate in wet-method grinding way

An ultra-fine calcium carbonate, wet grinding technology, used in calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc., can solve the problem of unbearable production costs, wet production scale limitations, dust Large pollution and other problems, to achieve the effect of low production cost, excellent properties, and easy operation of the production process

Inactive Publication Date: 2018-09-21
立达超微工业(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Ultrafine calcium carbonate refers to calcium carbonate with primary particle size between 0.02-0.1μm. It is a kind of nanometer material. It has special quantum size effect, small size effect and surface effect, making it different from conventional powder Compared with the material, it shows obvious advantages in terms of reinforcement, transparency, dispersion, thixotropy and leveling, and its toughening and reinforcing effect has greatly improved and improved the product performance and quality of related industries. At present, The production of ultra-fine calcium carbonate in the industry is mostly divided into dry method and wet method. Among them, the dry method technology is more mature, and the processing device system composed of general grinding and grading equipment can obtain products of various particle sizes, but the dust pollution is relatively large. With the increase of specific surface area requirements, the production cost is unbearable. Compared with the traditional dry method, the wet method has the advantages of finer calcium carbonate fineness, larger specific surface area, higher chemical stability and less pollution. Series advantages
However, there is agglomeration phenomenon in the production process, and the scale of wet production has been limited

Method used

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  • Process for preparing ultrafine calcium carbonate in wet-method grinding way

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of technology that wet grinding prepares superfine calcium carbonate, comprises the following steps:

[0027] (1) Select calcite with calcium carbonate content ≥ 98%, Mohs hardness ≤ 3, and metal oxide content ≤ 0.1%, and transport it to the jaw crusher through the conveyor for coarse crushing, then enter the Raymond machine for fine crushing, and pass through 100 meshes after fine crushing Sieve and then pass through the iron remover to get dry powder;

[0028] (2) Add water, diethylene glycol and polyphosphate dispersant in the batching tank (the mass ratio of water to diethylene glycol is 10:1), the addition of polyphosphate dispersant is 0.3% of the calcite weight, and the control speed is 200r After mixing for 15 minutes, add the above-mentioned dry powder (the mass ratio of dry powder to water is 5:2), increase the speed to 1100r / min after adding, mix for 30 minutes, and transfer the mixed slurry to the grinder. The ball-to-material ratio is 3:1, the grind...

Embodiment 2

[0032] A kind of technology that wet grinding prepares superfine calcium carbonate, comprises the following steps:

[0033] (1) Select calcite with calcium carbonate content ≥ 98%, Mohs hardness ≤ 3, and metal oxide content ≤ 0.1%, and transport it to the jaw crusher through the conveyor for coarse crushing, then enter the Raymond machine for fine crushing, and pass through 100 meshes after fine crushing Sieve and then pass through the iron remover to get dry powder;

[0034] (2) Add water, diethylene glycol and polyphosphate dispersant in the batching tank (the mass ratio of water to diethylene glycol is 10:1), the addition of polyphosphate dispersant is 0.25% of the calcite weight, and the control speed is 150r After mixing for 12 minutes, add the above-mentioned dry powder (the mass ratio of dry powder to water is 5:2), increase the speed to 1200r / min after adding, mix for 25 minutes, and transfer the mixed slurry to the grinder. The ball-to-material ratio is 3:1, the grin...

Embodiment 3

[0038] A kind of technology that wet grinding prepares superfine calcium carbonate, comprises the following steps:

[0039] (1) Select calcite with calcium carbonate content ≥ 98%, Mohs hardness ≤ 3, and metal oxide content ≤ 0.1%, and transport it to the jaw crusher through the conveyor for coarse crushing, then enter the Raymond machine for fine crushing, and pass through 100 meshes after fine crushing Sieve and then pass through the iron remover to get dry powder;

[0040] (2) Add water, diethylene glycol and polyphosphate dispersant (the mass ratio of water to diethylene glycol is 10:1) in the batching tank, the addition of polyphosphate dispersant is 0.35% of the calcite weight, and the control speed is 200r After mixing for 10 minutes, add the above-mentioned dry powder (the mass ratio of dry powder to water is 5:2), increase the speed to 1000r / min after adding, mix for 30 minutes, and transfer the mixed slurry to the grinder. The ball-to-material ratio is 3:1, the grin...

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Abstract

The invention provides a process for preparing ultrafine calcium carbonate in a wet-method grinding way, which relates to the technical field of fine chemical industry. The process comprises the following steps: (1) transporting calcite to a jaw crusher by virtue of a transporting machine, roughly crushing the calcite, enabling the crushed calcite to enter a raymond mill to be finely crushed, filtering the finely crushed calcite, removing iron by virtue of an iron removal device, and obtaining dry powder; (2) adding water, diethylene glycol and front-stage dispersant, controlling the rotationspeed at 100 to 300 r / min, mixing for 10 to 20 min, adding the dry powder, increasing the rotation speed to 1000 to 1200 r / min, mixing for 20 to 40 min, transferring the mixed slurry into a grinding machine, wherein a ball-material ratio is 3:1, a grinding medium is grinding zirconium balls, after beginning the grinding, supplementing the front end dispersant one time every 30 minutes, grinding for 2 hours, then adding a rear dispersant and a PH adjusting agent, wherein the addition amount of the rear-stage dispersant is 0.4 to 0.5 percent of the weight of the calcite, and continuously grinding for 100 to 120 min; and (3) discharging, washing, drying, thus obtaining a finished product. By adopting the process, the agglomeration phenomenon in the production process of the ultrafine calciumcarbonate can be effectively solved, and the production scale can be increased.

Description

technical field [0001] The invention relates to the technical field of fine chemicals, in particular to a process for preparing ultrafine calcium carbonate by wet grinding. Background technique [0002] Ultrafine calcium carbonate refers to calcium carbonate with primary particle size between 0.02-0.1μm. It is a kind of nanometer material. It has special quantum size effect, small size effect and surface effect, making it different from conventional powder Compared with the material, it shows obvious advantages in terms of reinforcement, transparency, dispersion, thixotropy and leveling, and its toughening and reinforcing effect has greatly improved and improved the product performance and quality of related industries. At present, The production of ultra-fine calcium carbonate in the industry is mostly divided into dry method and wet method. Among them, the dry method technology is more mature, and the processing device system composed of general grinding and grading equipm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/185C01P2006/12C01P2006/19
Inventor 蔡旻谚
Owner 立达超微工业(苏州)有限公司
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