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Production technique of nano calcium carbonate by normal temperature method

A technology of nano-scale calcium carbonate and nano-calcium carbonate, which is applied in the direction of calcium carbonate/strontium/barium, nanotechnology, etc., can solve the problems of high energy consumption, high production cost, and large equipment investment, so as to reduce investment, reduce energy consumption, The effect of reducing production costs

Active Publication Date: 2012-09-19
HUNAN JINJIAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production method of nano-scale calcium carbonate is mainly carbonization method. At present, the main production method of nano-scale calcium carbonate carbonization is low-temperature freezing method, such as: carbonization method with stirring bubbles, high-gravity carbonization method, etc. These production processes must be equipped with low-temperature freezing Therefore, the equipment investment is large, and the energy consumption and production cost are very high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The technological process of the present embodiment is:

[0021] A, ingredients: the calcium hydroxide solution is passed through a suspension separator to remove impurities, and water is added to adjust the concentration of calcium oxide in the solution to 10% to become a refined calcium hydroxide solution for subsequent use;

[0022] B, carbonization: the spare refined calcium hydroxide solution is placed in the carbonization tower, the carbon dioxide gas after passing into the purification carries out bubbling carbonization, and adds and accounts for the zinc sulfate of calcium oxide weight 3% in the refined calcium hydroxide solution and Sodium pyrophosphate mixture (the ratio of the two is equal, or other ratios) is used as a crystal form directing agent and a crystal form inhibitor, and the initial carbonization treatment is carried out at a normal temperature range of 20-65°C (in the entire carbonization process In, the heat that carbonization reaction produces, ...

Embodiment 2

[0030] The technological process of the present embodiment is:

[0031] A, ingredients: the calcium hydroxide solution is passed through a suspension separator to remove impurities, and water is added to adjust the concentration of calcium oxide in the solution to 8% to become a refined calcium hydroxide solution for subsequent use;

[0032] B, carbonization: the spare refined calcium hydroxide solution is placed in the carbonization tower, the carbon dioxide gas after passing into the purification carries out bubbling carbonization, and adds the calcium sulfate that accounts for 1% of calcium oxide weight in the refined calcium hydroxide solution and Sodium polyacrylate mixture (the ratio of the two is equal, and other ratios can also be used) is used as a crystal form directing agent and a crystal form inhibitor, and the initial carbonization treatment is carried out at a normal temperature range of 20-65°C (in the entire carbonization process In, the heat that carbonization...

Embodiment 3

[0040] The technological process of the present embodiment is:

[0041] A, ingredients: the calcium hydroxide solution is passed through a suspension separator to remove impurities, and water is added to adjust the concentration of calcium oxide in the solution to 6% to become a refined calcium hydroxide solution for subsequent use;

[0042] B. Carbonization: Put the spare refined calcium hydroxide solution in the carbonization tower, feed in the purified carbon dioxide gas for bubbling carbonization, and add sodium metaphosphate accounting for 1% of the weight of calcium oxide in the refined calcium hydroxide solution and polyacrylic acid mixture (the ratio of the two is equal, and other ratios can also be used) as a crystal-form directing agent and a crystal-form inhibitor, and the initial carbonization treatment is carried out at a normal temperature range of 20-65 ° C (in the entire carbonization process In, the heat that carbonization reaction produces, although the tempe...

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Abstract

The invention discloses a production technique of nano calcium carbonate by a normal temperature method, belonging to the technical field of fine chemical engineering. The production technique comprises the following steps: proportioning, carbonizing, treating, dehydrating, primary drying, secondary drying and depolymerizing. The invention has the characteristics of low equipment investment, low energy consumption, low production cost and the like, can implement production under normal temperature conditions, and can control the particle size and crystal form. The nano calcium carbonate produced by the technique disclosed by the invention can be used as a filling material in plastics industry, rubber industry, paint industry, paper manufacturing industry, ink industry, adhesive industry and other industries.

Description

technical field [0001] The invention relates to the technical field of fine chemicals, in particular to a production process of nano-scale calcium carbonate by normal temperature method. Background technique [0002] Nano-scale calcium carbonate, also known as ultra-fine calcium carbonate, is mainly used in the plastics industry, rubber industry, paint industry, paper industry, ink industry and adhesive industry. The production method of nano-scale calcium carbonate is mainly carbonization method. At present, the main production method of nano-scale calcium carbonate carbonization is low-temperature freezing method, such as: carbonization method with stirring bubbles, high-gravity carbonization method, etc. These production processes must be equipped with low-temperature freezing device, thereby, its equipment investment is relatively large, and energy consumption and production cost are all very high. Contents of the invention [0003] The purpose of the present inventio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y40/00
Inventor 文经建
Owner HUNAN JINJIAN NEW MATERIAL TECH
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