Process for producing fine calcium carbonate by wet carbon solidification method using industrial flue

A technology of fine calcium carbonate and industrial flue gas, applied in the direction of calcium carbonate/strontium/barium, separation methods, chemical instruments and methods, etc., can solve problems such as failure to fully utilize effective resources, limit application development, and complex processing methods. Achieve the effects of high product added value, low input cost and simple process

Inactive Publication Date: 2004-04-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For a long time, due to backward technology and lack of attention to conceptual issues, industrial flue gas is discharged into the air after simple treatment, failing to make full use of the effective resources
There have also been devices for treating and purifying industrial combustion exhaust gas, but these devices and processing methods are relatively complicated, and the treated gas cannot be used, thus limiting its application and development

Method used

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  • Process for producing fine calcium carbonate by wet carbon solidification method using industrial flue
  • Process for producing fine calcium carbonate by wet carbon solidification method using industrial flue

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] Example 1: Add 2.5 liters of NaOH solution with a molar concentration of 0.2 mol / liter to each of the two-stage decarburization containers of the test device, ignite solid alcohol fuel in the combustion chamber, and control the intake volume of the combustion chamber to make the combustion stable. Start the pumping device again, let the gas pass into the NaOH solution, stop the reaction after 60 minutes, and absorb CO in the first-stage decarburization device 2 0.183 moles, absorbing CO in the secondary decarburization unit 2 0.850 moles.

[0017] Take 1000ml of primary decarburization treatment liquid, add appropriate amount of dispersant and surface modifier to it for use.

[0018] Weigh 4.1g CaO solid and 20g water, put CaO solid into water, the two react violently. Leave the reaction vessel clean for 5 minutes, then add about 200ml of water to form a well-dispersed Ca(OH) 2 suspension.

[0019] The treated solution was stirred, the suspension was gradually added...

example 2

[0020] Example 2: Add 2.5 liters of NaOH solution with a molar concentration of 2 mol / liter in the decarburization container of the test device, ignite the solid alcohol fuel in the combustion chamber, control the intake air volume of the combustion chamber, and make the combustion stable. Start the pumping device again, let the gas pass into the NaOH solution, stop the reaction after 60 minutes, and absorb CO in the first-stage decarburization device 2 1.168 moles, absorbing CO in the secondary decarburization unit 2 0.176 mol.

[0021] Take 1000ml of primary decarburization treatment liquid, add appropriate amount of dispersant and surface modifier to it for use.

[0022] Weigh 26g of CaO solid and 130g of water, put the CaO solid into water, and the two react violently. Leave the reaction vessel clean for 5 minutes, then add about 500ml of water to form a well-dispersed Ca(OH) 2 suspension.

[0023] Stir the treatment solution, gradually add the suspension to it, and co...

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Abstract

The wet carbon fixing process of producing fine calcium carbonate with industrial fume includes a two-step alkali absorption-metathesis regeneration process to absorb CO2 in fume to form soluble carbonate quickly, synthesis with calcium hydroxide suspension after being digested and filtered to form homogeneous calcium carbonate, deposition, washing, filtering and stoving to obtain final product. On the other hand, gas after carbon fixation is dewatered and deoxidized to obtain high purity nitrogen, which may be led to nitridize furnace to synthesize nitride product. The present invention can recover low content CO2 in fume to purify fume and reduce pollution while utilizing nitrogen in fume.

Description

technical field [0001] The invention belongs to the technical field of new inorganic materials, and in particular provides a method for producing fine calcium carbonate by using an industrial flue gas wet carbon fixation method, which can recover low-content carbon dioxide (5-15%) in the flue gas, and can make the flue gas Purify, reduce pollution, and increase nitrogen concentration in flue gas. Background technique [0002] Calcium carbonate is an important inorganic chemical product, which can be widely used in rubber, plastics, paint, paper, ink, food and other industries. With the development of modern industrial technology, all walks of life have higher and higher requirements for calcium carbonate, and the demand is also increasing. Many industries need fine calcium carbonate particles with smaller particle size as additives to make composite materials with high performance. [0003] The currently used wet chemical synthesis of fine calcium carbonate technology is m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/34B01D53/62C01B21/04C01F11/18C04B35/58
CPCY02P20/151
Inventor 徐利华徐斌刘明李文超
Owner UNIV OF SCI & TECH BEIJING
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