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Industrial process for preparing nm-class active calcium carbonate

A kind of activated calcium carbonate and nanotechnology, which is applied in nanostructure manufacturing, calcium carbonate/strontium/barium, nanotechnology, etc., can solve the problems of high energy consumption, unstable product quality, uniform particle size distribution, etc.

Inactive Publication Date: 2008-01-23
BEIJING CHEM & IND CONSTRUCT MATERIAL FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main method is still the low-temperature carbonization method. Refrigerators are used to cool down the temperature. The carbonization temperature is kept below 20 degrees, so that the particle size of the finished product is below 100 nanometers. However, the quality of the resulting product is unstable, the particle size distribution is uniform and large, and the energy consumption is large.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In a 5 cubic meter carbonation tower with stirring, add 3.5m 3 Calcium hydroxide suspension, the calcium hydroxide suspension is refined, the mass concentration is 9%, add crystal control agent sucrose 20kg, zinc sulfate 10kg at the same time, pass into the kiln gas containing carbon dioxide (volume concentration: 20-30%) Carry out carbonization, the carbonization start temperature is 16 degrees, carbonization to the ph value of the slurry is 7-8, and then carbonization for 5-10 minutes to obtain a suspension of nano-calcium carbonate, as the carbonization reaction proceeds, the slurry temperature rises to 44 degrees or so.

[0021] Add 500kg of an aqueous solution containing sodium stearate (20kg) borate ester coupling agent SBW-3 (5kg) at a temperature of 85 degrees to this slurry, continue to stir, heat-preserve for 2 hours, then filter while it is hot, and dry at 100 degrees , after crushing, the shape is cubic, the particle size distribution is 60-90nm, and the oi...

Embodiment 2

[0023] Add refined calcium hydroxide suspension 3.5m into a stirred carbonization tower of 5 cubic meters 3 , the mass concentration of calcium hydroxide suspension is 6%, add crystal control agent simultaneously: glucose 15kg, ammonium sulfate 5kg, pass into the kiln gas (concentration is 20-30%) that contains carbon dioxide and carry out carbonization, carbonization start temperature is 22 degrees , carbonize until the pH value of the slurry is 7-8, and then carbonize for 5-10 minutes to prepare a suspension of nano-calcium carbonate. As the carbonization reaction proceeds, the temperature of the slurry rises to about 42 degrees.

[0024] Adding temperature to this slurry is 90 degrees, concentration is 300kg of rosin acid sodium saponification liquid of 10% to carry out surface activation treatment, after processing for 1.5 hours, then add concentration is 20% aluminum sulfate solution 50kg, continue to stir and process for one hour, filter ,Dried at 100 degrees, crushed in...

Embodiment 3

[0026] Add refined calcium hydroxide suspension 3.5m into a stirred carbonization tower of 5 cubic meters 3 , the mass concentration of calcium hydroxide suspension is 11.5%, adds crystal control agent simultaneously: ammonium sulfate 30kg, lactose 15kg, pass into the kiln gas (concentration is 20-30%) that contains carbon dioxide after stirring and carry out carbonization, carbonization start temperature 20 degrees, carbonized until the pH value of the slurry is 7-8, and then carbonized for 5-10 minutes to prepare a suspension of nano-active calcium carbonate. As the carbonization progresses, the temperature of the slurry rises to 45 degrees.

[0027] Add 500 kg of an aqueous solution containing 20 kg of SBW-1 boric acid ester coupling agent and 15 kg of sodium stearate at a temperature of 90 degrees to the slurry, continue to insulate and stir, process for 2 hours, filter, dry at 100 degrees, and crush to produce The shape is cubic, the particle size distribution is 70-100nm...

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Abstract

The invention provides the industrial preparation method of the nano activated calcium carbonate. The crystal control agent is added in the suspending liquid of the calcium hydroxide and is carbonized by the kiln gas containing the carbon dioxide. Through controlling the temperature and concentration of the calcium hydroxide, the concentration of the carbon dioxide and the addition and variety of the crystal control agent, the initial nucleation rate and nucleation quantity of the crystal and the growth rate of each crystal face of the crystal during carbonization are adjusted to realize the shape control of the crystal, and then surfactant is added to conduct activating treatment. The nano activated calcium carbonate is gained after filtering and drying, which has a shape of cube and is regulable when the grain size is between 20nm to 100nm. The product gained by the method has excellent performance and can work as the functional filler, which can be widely used in such industries as top-grade coating, rubber, plastic and adhesive.

Description

technical field [0001] The invention relates to an industrial preparation method of calcium carbonate, in particular to an industrial preparation method of nano-active calcium carbonate. technical background [0002] Nano-calcium carbonate refers to calcium carbonate powder with a particle size of less than 100nm. The surface of calcium carbonate is hydrophilic under normal conditions, and becomes lipophilic after surface organic treatment, becoming nano-active calcium carbonate. It is widely used in plastics, rubber, and polymer resins to improve product performance and product quality. It is a new type of functional inorganic filler. [0003] At present, the preparation methods of nano-calcium carbonate include continuous spray method, high gravity carbonization method, and stirring tank carbonization method. The nozzles of the continuous spray method are easy to block, and it is difficult to ensure the consistency of the droplets in industrial production, which requires ...

Claims

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Application Information

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IPC IPC(8): C01F11/18B82B3/00
Inventor 李洪伟董云曹学琴胡娜赵相梅罗成军
Owner BEIJING CHEM & IND CONSTRUCT MATERIAL FACTORY
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