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Calcium carbonate surface treatment method

A surface treatment and surface treatment agent technology, which is applied in the field of calcium carbonate surface treatment, can solve the problems of long process flow, large dry particle size, high operating cost, etc., to avoid secondary agglomeration, significant activation effect, and avoid particle size big effect

Inactive Publication Date: 2015-04-01
CHONGQING HETAI PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of wet surface treatment are that the equipment investment is large, the process flow is long, and the filtrate after treatment can only be discharged after biochemical treatment, and the operating cost is high.
[0006] At present, a calcium carbonate surface treatment process is being explored to overcome the large investment in wet equipment and long process flow, and at the same time overcome the problems of large particle size, poor dispersion and poor effect of dry process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A surface treatment method for calcium carbonate, comprising the steps of:

[0028] (1) The 400 mesh calcium carbonate powder of 100Kg is mixed with the suspension that mass percent concentration is 30%, adds 100g sodium stearate dispersant and carries out wet grinding to mean particle size and is 1.8 μ m, press filtration obtains calcium carbonate filtrate ;

[0029] (2) Vacuum-dry the above-mentioned calcium carbonate filtrate at 80°C to obtain calcium carbonate powder with a moisture content≤800ppm;

[0030] (3) Heat 1Kg of stearic acid, a surface treatment agent, to 70°C, atomize, spray onto 100Kg of the vacuum-dried calcium carbonate powder placed in a high-speed dispersion reactor, and stir at a high speed of 1400 rpm for 10 minutes at the same time The activated calcium carbonate powder is obtained.

[0031] After cooling, the performance parameters of the activated calcium carbonate powder were measured according to GBT 19281-2003: the measured oil absorption ...

Embodiment 2

[0033] A surface treatment method for calcium carbonate, comprising the steps of:

[0034] (1) The 400 mesh calcium carbonate powder of 100Kg is mixed with the suspension that mass percent concentration is 40%, adds 500g sodium polyacrylate dispersant and carries out wet grinding to average particle size and is 1.8 μm, press filtration obtains calcium carbonate filtrate;

[0035] (2) Vacuum-dry the above-mentioned calcium carbonate filtrate at 100°C to obtain calcium carbonate powder with a moisture content≤800ppm;

[0036] (3) Heat 5Kg of surface treatment agent stearic acid to 80°C, atomize, spray onto 100Kg of the above-mentioned vacuum-dried calcium carbonate powder placed in a high-speed dispersion reactor, and stir at a high speed of 1200 rpm for 10 minutes at the same time The activated calcium carbonate powder is obtained.

[0037] After cooling, the performance parameters of the activated calcium carbonate powder were measured according to GBT 19281-2003: the measure...

Embodiment 3

[0039] A surface treatment method for calcium carbonate, comprising the steps of:

[0040] (1) The 400-mesh calcium carbonate powder of 100Kg is formulated into a suspension with a mass percentage concentration of 35%, and 250g of polydimethylsiloxane dispersant is added for wet grinding until the average particle size is 1.8 μm, and the carbonic acid is obtained by pressure filtration. Calcium filtrate;

[0041] (2) Vacuum-dry the above-mentioned calcium carbonate filtrate at 90°C to obtain calcium carbonate powder with a moisture content≤800ppm;

[0042] (3) Heat 2.5Kg of surface treatment agent stearic acid to 75°C, atomize, spray onto 100Kg of the above-mentioned vacuum-dried calcium carbonate powder placed in a high-speed dispersion reactor, and stir at a high speed of 1300 rpm After 10 minutes, the activated calcium carbonate powder was obtained.

[0043] After cooling, the performance parameters of the activated calcium carbonate powder were measured according to GBT ...

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Abstract

The invention relates to a calcium carbonate surface treatment method, which comprises: (1) preparing 400 mesh calcium carbonate powder into a suspension with a mass percent concentration of 30-40%, adding a dispersant, carrying out wet grinding to achieve the average particle size of 1.8 [mu]m, and carrying out pressure filtration to obtain a calcium carbonate filtrate; (2) carrying out vacuum drying on the calcium carbonate filtrate at a temperature of 80-100 DEG C to obtain calcium carbonate powder with the water content of less than or equal to 800 ppm; and (3) heating a surface treatment agent stearic acid to a temperature of 70-80 DEG C, atomizing, spraying on the calcium carbonate powder placed in a high speed dispersion reaction kettle, and concurrently carrying out high speed stirring for 10 min to obtain the activated calcium carbonate powder. According to the invention, the atomizing spraying way is adopted to completely utilize the stearic acid, and the vacuum drying method is adopted, such that the water content of the calcium carbonate powder is reduced to less than or equal to 800 ppm so as to avoid secondary agglomeration.

Description

technical field [0001] The invention relates to a surface treatment method of inorganic substances, in particular to a surface treatment method of calcium carbonate. Background technique [0002] Calcium carbonate mainly comes from calcium carbonate rock, which is widely distributed in the earth's crust, with a distribution area of ​​534 square kilometers, accounting for 4% of the earth's land surface area. The total distribution area of ​​carbonate in my country is about 344 square kilometers, accounting for 64% of the world. Calcium carbonate is an important and widely used inorganic salt, and it is one of the most used fillers. Most of the inorganic fillers are calcium carbonate, which is widely used in papermaking, plastics, and rubber industries. In industrial production, in order to reduce the agglomeration between nano-calcium carbonate particles, while improving the affinity of nano-calcium carbonate particles and organic polymers and the dispersibility in organic ...

Claims

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Application Information

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IPC IPC(8): C09C1/02C09C3/04C09C3/08C09C3/12C09C3/10
Inventor 刘文艺
Owner CHONGQING HETAI PLASTIC
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