Continuous calcium carbonate production system and method

A production method and production system technology, applied in calcium carbonate/strontium/barium, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of high energy consumption, serious dust pollution, low product whiteness and fineness, etc. , to achieve the effect of low heavy metal content, high product purity and good dispersibility

Pending Publication Date: 2022-04-29
SHANDONG NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Serious overcapacity, lime carbonization process, high energy consumption, serious dust pollution, large carbon dioxide emissions, single variety;
[0006] 2. Calcium carbonate has serious low-quality homogeneity, lack of high-quality calcium carbonate production technology, few varieties and specifications, low whiteness and fineness of products, and cannot meet high-quality requirements;
[0007] 3. Judging from the status quo of the industry, most of the calcium carbonate products currently produced are ordinary precipitated calcium carbonate products with low grades, and high-end calcium carbonate products need to be developed. At present, 95% of high-end calcium carbonate products rely on imports;
[0008] 4. Now people have discovered more than a dozen crystal forms of calcium carbonate. Calcium carbonate products with different crystal grains, different crystal forms, and different crystal appearances have different uses. At present, there is no good control method for industrial production

Method used

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  • Continuous calcium carbonate production system and method
  • Continuous calcium carbonate production system and method
  • Continuous calcium carbonate production system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Na 2 CO 3 Be made into the solution that mass fraction is 35%, feed with the feed rate feed of 7.9g / min by feed pump; CaCl 2 Be made into the solution that mass fraction is 14%, feed with the feed rate feed of 20g / min by feed pump, sodium carbonate solution feeds from the upper end of continuous flow reactor, and calcium chloride solution enters from the lower end of continuous flow reactor Material, Ca 2+ with CO 3 2- The molar ratio is 1:1.05, the pH value of the reaction system is 9.0, and the reaction temperature is 80°C. After 10 seconds of reaction, the slurry is transferred from the pipeline to the aging reactor for aging. The aging temperature is 80°C, and the aging time is 0.5h. Then start to discharge continuously. After suction filtration, washing and drying, high-purity calcium carbonate products are obtained, such as Figure 1~2 shown. Calcium carbonate as Ca 2+ The meter contains a purity of 99.8% as CO 3 2-The calculated purity is 99.9%.

Embodiment 2

[0050] First put (NH 4 ) 2 CO 3 Be made into the solution of mass fraction 32%, feed with the feed rate feed of 7.8g / min by feed pump; CaCl 2 Be made into the solution of mass fraction 14%, feed with the feed rate feed of 20g / min by feed pump, ammonium carbonate solution feeds from the upper end of continuous flow reactor, and calcium chloride solution feeds from the lower end of continuous flow reactor , Ca 2+ with CO 3 2- The molar ratio is 1:1.05, the pH value of the reaction system is 7.0, and the reaction temperature is 70°C. After 15 seconds of reaction, the slurry is transferred from the pipeline to the aging reactor for aging. The aging temperature is 70°C, and the aging time is 0.6h. Then start to discharge continuously. After suction filtration, washing and drying, high-purity calcium carbonate products are obtained, such as Figure 3-4 shown. Calcium carbonate as Ca 2+ The meter contains a purity of 98.8%, based on CO 3 2- The calculated purity was 99.0%....

Embodiment 3

[0052] Na 2 CO 3 Be made into the solution of mass fraction 32%, feed with the feed rate feed of 8.3g / min by feed pump; Ca(NO 3 ) 2 Be made into the solution of mass fraction 21%, feed with the feed rate feed of 20g / min by feed pump, sodium carbonate solution feeds from the lower end of continuous flow reactor, calcium nitrate solution feeds from the upper end of continuous flow reactor, Ca 2+ with CO 3 2- The molar ratio is 1:1.1, the pH value of the reaction system is 10.0, and the reaction temperature is 60°C. After 20s of reaction, the slurry is transferred from the pipeline to the aging reactor for aging. The aging temperature is 60°C, and the aging time is 0.7h. Then start to discharge continuously. After suction filtration, washing and drying, high-purity calcium carbonate products are obtained, such as Figure 5-6 shown. Calcium carbonate as Ca 2+ The meter contains a purity of 99.1%, as CO 3 2- The calculated purity is 99.5%.

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Abstract

The invention discloses a calcium carbonate continuous production system and method, and the method is as follows: a calcium salt solution and a carbonate solution enter a continuous flow reactor through a feed pump for reaction, the reacted material is cured, and the cured material is discharged; the crystal form and the crystal appearance of calcium carbonate are controlled by controlling the types of calcium salt anions and / or controlling the solution concentration. The prepared calcium carbonate is high in purity and good in dispersity, and the particle size, the crystal form and the morphology of the calcium carbonate can be adjusted.

Description

technical field [0001] The invention relates to the technical field of calcium carbonate production, in particular to a calcium carbonate continuous production system and method. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Calcium carbonate with different crystal forms and shapes has different use effects. The generation of calcium carbonate with specific crystal forms and special shapes is controlled by condition control. Technological progress is significant. [0004] According to the research of the inventor, the following problems generally exist in the calcium carbonate industry at present: [0005] 1. Serious overcapacity, lime carbonization process, high ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/00B01J4/00C01F11/18
CPCB01J19/00B01J4/001C01F11/181B01J2219/0004B01J2204/002B01J2204/005
Inventor 刘启奎毛震杨松
Owner SHANDONG NORMAL UNIV
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