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Industrial preparation method of producing nano calcium carbonate by recycling filter-pressing water

A technology of nano-calcium carbonate and press-filtered water, which is applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems that the press-filtered water cannot be reused, the product quality is unstable, and the quality of nano-calcium carbonate products is poor in reproducibility. High quality reproducibility, easy industrialization, and high temperature effects

Inactive Publication Date: 2014-01-22
SHANXI LANHUA HUAMING NANO MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides an industrial preparation method for producing nano-calcium carbonate by reusing press water, which solves the problem that the press water produced in the production process of the existing preparation method cannot be reused and the existing water treatment technology is used to treat the press water The problem of poor reproducibility of nano calcium carbonate product quality and unstable product quality after reuse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The first step is to add 40 cubic meters of Ca(OH) digested with filtered water to a carbonization reactor with a diameter of 3 meters and a height of 6 meters. 2 Suspension, Ca(OH) 2 The mass concentration of the suspension is 7.92%.

[0022] The second step, adjust Ca(OH) 2 the temperature of the suspension to 24°C;

[0023] In the third step, a mixed gas of carbon dioxide and nitrogen was introduced into the reactor at a rate of 0.6 cubic meters per second. The volume concentration of carbon dioxide gas in the mixed gas was 35%. After 10 minutes, when Ca(OH) 2 When the carbonization rate of the suspension reaches 8-10%, add 35 kg of polysaccharide and continue to carbonize until Ca(OH) 2 The pH value of the suspension was 6.85, and nano-sized cubic calcium carbonate was formed, and the reaction end temperature was 61°C.

[0024] The fourth step, in Ca(OH) 2 Add 10 kg of polyacrylate to the suspension;

[0025] The 5th step, configure 225 kilograms of fatty acid...

Embodiment 2

[0028] The first step is to add 30 cubic meters of Ca(OH) to the carbonization reactor with a diameter of 3 meters and a height of 6 meters. 2 Suspension, Ca(OH) 2 The mass concentration of the suspension is 7.92%;

[0029] The second step, adjust Ca(OH) 2 the temperature of the suspension to 24°C;

[0030] In the third step, a mixed gas of carbon dioxide and nitrogen was introduced into the reactor at a rate of 0.7 cubic meters per second. The volume concentration of carbon dioxide gas in the mixed gas was 52%. After 10 minutes, when Ca(OH) 2 When the carbonization rate of the suspension reaches 8-10%, add 25Kg of polysaccharide and continue to carbonize until Ca(OH) 2 The pH value of the suspension was 6.85, and nano-sized cubic calcium carbonate was formed, and the reaction end temperature was 61°C.

[0031] The fourth step, in Ca(OH) 2 12Kg of polyacrylate was added to the suspension;

[0032] The 5th step, configure 166 kilograms of fatty acids into 10% aqueous solu...

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Abstract

The invention relates to an industrial preparation method of producing nano calcium carbonate by recycling filter-pressing water, and is used for solving a problem that a nano calcium carbonate product is poor in repeatability and unstable in quality after the existing water treatment technology is utilized to treat the filter-pressing water in an existing preparation method. The industrial preparation method comprises the following steps: filtering the filter-pressing water in a nano calcium carbonate producting process by using a high temperature resistant filter press, keeping the water temperature at 65 DEG C-85 DEG C, modulating the mass concentration of digested calcium hydroxide liquor to 6%-10%, and controlling the temperature to 22 DEG C-35 DEG C; then, filling into a reaction kettle, regulating the temperature of Ca(OH)2 suspension liquid to 25 DEG C-40 DEG C; ventilating a gas mixture of carbon dioxide and nitrogen gas into a carbonization reaction kettle at the velocity of 0.6-0.8 cubic meter / second, adding a dispersing agent which accounts for 0.02%-0.05% of the total weight of the Ca(OH)2 in the suspension liquid of the Ca(OH)2, heating a nano calcium carbonate sizing agent to 55 DEG C-65 DEG C, and adding a coating agent. The industrial preparation method disclosed by the invention realizes the closed cycle of nano calcium carbonate process water.

Description

technical field [0001] The invention relates to a preparation method of calcium carbonate, in particular to an industrial preparation method for producing nanometer calcium carbonate by reusing the press-filtered water produced by the production of nanometer calcium carbonate. Background technique [0002] Nano calcium carbonate refers to ultra-fine powder with a particle size of less than 100 nanometers. Nano activated calcium carbonate refers to a chemical product that changes from hydrophilic to lipophilic after organic surface treatment of calcium carbonate. The product can be widely used in automotive primers, Rubber, plastic and other industries. Ultra-fine, narrow particle size distribution, stable crystal morphology and high reproducibility of product quality are a basic requirement of this product. The main technological process of the existing nano calcium carbonate production is: limestone is calcined to produce lime and carbon dioxide, lime is digested into a ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 马建民郭俊凌沈晓峰段秀红程海江
Owner SHANXI LANHUA HUAMING NANO MATERIALS
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