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Production of light calcium carbonate

A light calcium carbonate, production method technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of limited dosage and application range, can not be used for industrial production, wide product particle size distribution, etc., achieve product quality and stability, operation Consistent conditions and good product quality

Inactive Publication Date: 2007-09-19
SHANDONG HAIHUA GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of using calcined china clay as white paint are that raw materials are scarce and expensive; the disadvantages of using heavy calcium carbonate are large production investment, high cost, backward technology, poor production environment, wide particle size distribution of the product, and single crystal form; light weight Although calcium carbonate can overcome the above-mentioned shortcomings of heavy calcium carbonate, due to the current general-purpose light calcium carbonate, most of its crystal forms are spindle-shaped, and the particle size is large, difficult to disperse, the coating viscosity is large, and the gloss is poor, so its dosage and the scope of application is limited
In the description of the patent No. 97100852.3, a production method of light calcium carbonate is disclosed. The method is to use calcium oxide and carbon dioxide gas as raw materials, and add different additives before, during and after carbonization to control The crystal form of calcium carbonate and the improvement of the whiteness of calcium carbonate, the disadvantage of this method is that the process conditions are harsh, although it can be realized in the laboratory, it is difficult to achieve in industrial production, so this method cannot be used in industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] (1), be limestone by weight: the ratio of coke=100: 9, the limestone and coke are layered into the kiln, ignite coke, calcine 50 hours-60 hours under the condition that temperature is 800 ℃-1100 ℃, Production of quicklime and carbon dioxide;

[0024] (2), in quicklime, add the water of 10 times of quicklime weight, carry out digestion reaction under the condition that temperature is 56 ℃, add the activator formic acid of 2% of quicklime weight before digestion reaction starts, add after digestion reaction starts 15 minutes The dispersant sodium acetate of 2% by weight of quicklime, after the digestion reaction is completed, is often warmed and cooled, slag removed, and maintained for 32 hours to obtain a calcium hydroxide emulsion with a concentration of 13% (wt) and a fineness of less than 1 μm;

[0025] (3), carbon dioxide gas and calcium hydroxide emulsion are carried out carbonization reaction under the condition of 30 ℃, the carbon dioxide gas concentration that fe...

example 2

[0034] (1), be limestone by weight: the ratio of coke=100: 8, the limestone and coke are layered into the kiln, ignite coke, calcine 50 hours-55 hours under the condition that temperature is 900 ℃-1100 ℃, Production of quicklime and carbon dioxide;

[0035] (2), in quicklime, add the water of 10 times of quicklime weight, carry out digestion reaction under the condition that temperature is 65 ℃, add the activator acetic acid of 2% of quicklime weight before digestion reaction starts, add after digestion reaction starts 15 minutes 2% of the dispersant ammonium formate by weight of quicklime, after the digestion reaction is completed, often warm and self-cooling, slag removal, and curing, the curing time is 35 hours, and the calcium hydroxide with a concentration of 12% (wt) and a fineness of less than 1 μm is obtained. lotion;

[0036] (3), carbon dioxide gas and calcium hydroxide emulsion are carried out carbonization reaction under the condition of 26 ℃, the carbon dioxide g...

example 3

[0045] (1), be limestone by weight: the ratio of coke=100: 7, the limestone and coke are layered into the kiln, ignite coke, calcine 55 hours-60 hours under the condition that temperature is 800 ℃-1100 ℃, Production of quicklime and carbon dioxide;

[0046] (2), in quicklime, add the water of 10 times of quicklime weight, carry out digestion reaction under the condition that temperature is 70 ℃, add the activator formic acid of 2% of quicklime weight before digestion reaction starts, and digestion reaction starts to add after 15 minutes 2% of the dispersant ammonium acetate by weight of quicklime, after the digestion reaction is completed, often warm and self-cooling, slag removal, and maintenance, and the curing time is 40 hours to obtain calcium hydroxide with a concentration of 11% (wt) and a fineness of less than 1 μm lotion;

[0047] (3), carbon dioxide gas and calcium hydroxide emulsion are carried out carbonization reaction under the condition of 18 ℃, the carbon dioxi...

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Abstract

Production of light calcium carbonate is carried out by roasting limestone to produce quick lime and carbon dioxide by coke, quick lime digesting reacting with water to produce calcium hydroxide emulsion, adding activator before digesting reaction, adding disperser during reacting process, carbonizing reacting for carbon dioxide and calcium hydroxide emulsion, adding brightening agent after carbonizing reacting, dewatering, drying and obtaining the product. It can control crystalline form, size and viscosity of the product, improve whiteness of the product, and can be used for industrial continuous production.

Description

technical field [0001] The present invention relates to a kind of production method of light calcium carbonate. Background technique [0002] In order to increase the whiteness of paper, paper is coated with white paint in the papermaking industry. Among the white paints used for paper coating, calcined porcelain clay (referring to washed soil) is the most used, followed by calcium carbonate and calcium carbonate. Divided into heavy calcium carbonate and light calcium carbonate. The disadvantages of using calcined china clay as white paint are the shortage of raw materials and high price; the disadvantages of using heavy calcium carbonate are that the production investment is large, the cost is high, the process is backward, the production environment is not good, the particle size distribution of the product is wide, and the crystal form is single; light weight Although calcium carbonate can overcome the above-mentioned deficiencies of heavy calcium carbonate, due to the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
Inventor 宋传庠常守海李培军
Owner SHANDONG HAIHUA GRP CO LTD
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