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Method for preparing high-quality superfine and light calcium carbonate by taking gypsum as raw material

A technology of light calcium carbonate and calcium carbonate, applied in the direction of calcium carbonate/strontium/barium, chemical instruments and methods, sustainable manufacturing/processing, etc., can solve the problems of large energy consumption and energy consumption, and achieve energy saving and high performance High, the effect of improving processability and mechanical properties

Inactive Publication Date: 2017-12-08
广西华洋矿源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many ways to prepare superfine calcium carbonate. However, in the existing production methods, it is usually necessary to calcinate limestone to 800-1000°C, so it consumes a lot of energy for heating, which is relatively energy-consuming.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing high-quality ultra-fine light calcium carbonate using gypsum as a raw material includes the following steps:

[0027] (1) Using gypsum as raw material, add appropriate amount of water to make a slurry with a calcium sulfate solid content of 40%;

[0028] (2) Add the calcium sulfate slurry of step (1) to 0.8 times the mass of calcium sulfate sodium carbonate, add 1% of the mass of calcium sulfate surfactant, stir at room temperature for 2 hours, and react to obtain a mixed slurry of sodium sulfate and calcium carbonate;

[0029] (3) Filter the slurry of step (2), and store the filtrate and the precipitate separately;

[0030] (4) Pass the filtrate of step (3) into carbon dioxide at room temperature for 30 minutes, filter again, put the filtrate into a storage tank for storage, and combine the obtained precipitate with the precipitate of step (3) and put it in a centrifuge for dehydration;

[0031] (5) Put the dehydrated precipitate in step (4) into a drying ...

Embodiment 2

[0041] A method for preparing high-quality ultra-fine light calcium carbonate using gypsum as a raw material includes the following steps:

[0042] (1) Using gypsum as raw material, add appropriate amount of water to make a slurry with a calcium sulfate solid content of 50%;

[0043] (2) Add the calcium sulfate slurry of step (1) to the amount of calcium sulfate substance 1 time sodium carbonate, add 2% calcium sulfate surface active agent, stir at room temperature for 3 hours, and react to obtain a sodium sulfate and calcium carbonate mixed slurry ;

[0044] (3) Filter the slurry of step (2), and store the filtrate and the precipitate separately;

[0045] (4) Pass the filtrate of step (3) into carbon dioxide at room temperature for 35 minutes, filter again, put the filtrate into a storage tank for storage, and combine the obtained precipitate with the precipitate of step (3) and put it in a centrifuge for dehydration;

[0046] (5) Put the dehydrated precipitate in step (4) into a dryi...

Embodiment 3

[0056] A method for preparing high-quality ultra-fine light calcium carbonate using gypsum as a raw material includes the following steps:

[0057] (1) Using gypsum as raw material, add appropriate amount of water to make a slurry with a calcium sulfate solid content of 60%;

[0058] (2) Add the calcium sulfate slurry of step (1) to 1.2 times the mass of calcium sulfate sodium carbonate, add 3% of the calcium sulfate mass surfactant, and stir at room temperature for 4 hours to react to obtain a mixed slurry of sodium sulfate and calcium carbonate;

[0059] (3) Filter the slurry of step (2), and store the filtrate and the precipitate separately;

[0060] (4) Pass the filtrate of step (3) into carbon dioxide at room temperature for 40 minutes, filter again, put the filtrate into a storage tank, and combine the obtained precipitate with the precipitate of step (3) and put it in a centrifuge for dehydration;

[0061] (5) Put the dehydrated precipitate in step (4) into a drying furnace, and ...

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Abstract

The invention discloses a method for preparing high-quality superfine and light calcium carbonate by taking gypsum as a raw material, belonging to the technical field of calcium carbonate production. The method for preparing high-quality superfine and light calcium carbonate by taking gypsum as a raw material comprises the following steps: (1) by taking gypsum as a raw material, adding a proper amount of water into the gypsum to blend into slurry in which the solid content of calcium sulfate is 40 to 60%; (2) adding the calcium sulfate slurry in step (1) with sodium carbonate of which the mass is 0.8 to 1.2 times the mass of calcium sulfate, and a surfactant of which the mass is 1 to 3% of the mass of calcium sulfate, stirring at room temperature for reaction for 2 to 4h to obtain sodium sulfate and calcium carbonate mixed slurry; (3) filtering the slurry obtained in step (2), and storing the filtrate and precipitate separately. The invention aims to provide the method for preparing high-quality superfine and light calcium carbonate by taking gypsum as a raw material, the production method has the advantages of simple operation, energy conservation and environmental protection, and high-quality superfine and light calcium carbonate can be produced.

Description

Technical field [0001] The invention belongs to the technical field of calcium carbonate production, and specifically relates to a method for preparing high-quality ultrafine light calcium carbonate by using gypsum as a raw material. Background technique [0002] Calcium carbonate is an industrial product of inorganic salts with a wide range of uses. It can be used as filling and modifying materials in plastics, rubber, paint, adhesives, papermaking, food processing, and pharmaceutical industries. It is closely related to people’s daily lives. Relationship. There are many methods for preparing ultrafine calcium carbonate. However, in the existing production methods, it is usually necessary to calcinate limestone to 800-1000°C, which consumes a lot of energy for heating and consumes more energy. Summary of the invention [0003] The purpose of the present invention is to provide a method for preparing high-quality superfine light calcium carbonate using gypsum as a raw material, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/18C01F11/185Y02P20/10
Inventor 李文康张宸宇欧西江
Owner 广西华洋矿源材料有限公司
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