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Method for preparing light calcium carbonate by using flue gas

A light calcium carbonate, flue gas technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of low purity of light calcium products, affecting the application effect, etc., to achieve low production cost, improve gloss, avoid agglomeration flocculent effect

Inactive Publication Date: 2014-04-09
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN1085188A discloses a kind of technology that industrial flue gas is used for producing light calcium carbonate, and it does not directly react with limewater to produce calcium carbonate precipitation after the flue gas is purified and dedusted without separation. Calcium hydroxide reacts to form calcium sulfite precipitates, resulting in low purity of light calcium products and affecting subsequent application effects

Method used

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  • Method for preparing light calcium carbonate by using flue gas
  • Method for preparing light calcium carbonate by using flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Purification and purification of flue gas:

[0019] Collect the boiler flue gas, and remove the impurities in the flue gas through the purification dust collector. The multi-layer filter plate can be installed in the purification dust collector to absorb and remove the solid micro particles in the flue gas; the flue gas after the preliminary purification is then passed through sodium bicarbonate Supersaturated solution desulfurization, a small amount of sulfur dioxide gas contained in the flue gas reacts with sodium bicarbonate to be removed, and the carbon dioxide generated by the reaction can increase the concentration of carbon dioxide; The pressure adsorption step obtains purified boiler flue gas. The pressure swing adsorption step includes: an adsorption step and a desorption step. The adsorption pressure of the adsorption step is controlled at 0.8-1.2MPa. Reduce the pressure to 0.4-0.5MPa, discharge the waste gas, and then reduce the pressure to -0.02-0.01MPa from...

Embodiment 2

[0023] Purification and purification of boiler flue gas: same as embodiment 1.

[0024] In the water slurry of calcium hydroxide (average particle size: 5 μm) with a weight concentration of 5%, add 0.8% sodium polyacrylate, which is the dry weight of calcium hydroxide, and send the calcium hydroxide slurry to the two sides with a pneumatic diaphragm pump. A series of 300 liter vertical sand mills with a feed flow rate of 15 liters / min. At the same time, the purified boiler flue gas is passed through the bottom of each sand mill at a flow rate of 90 liters per minute, and the sand mill is turned on so that grinding and carbonization are carried out simultaneously. The slurry discharged from the second sand mill is completely carbonized, the pH of the slurry is 7.0, and the carbonization temperature is 70°C. The average particle size of the obtained ultrafine calcium carbonate is 0.5 μm, and the particles smaller than 2 μm account for the total number of particles. 98% of.

Embodiment 3

[0026] Purification and purification of boiler flue gas: same as embodiment 1.

[0027] In the ordinary calcium hydroxide (average particle size: 5 μm) water slurry with a weight concentration of 25%, add 2% potassium phosphate salt containing 14 carbon atoms to the dry weight of calcium hydroxide, and the calcium hydroxide slurry Feed into a stirring mill of 3 cubic meters, pass the purified boiler flue gas from the bottom of the stirring mill, turn on the stirring mill, stir and grind carbonization for 8 hours at 80 rpm, the pH of the water slurry is 6.7, and the carbonization temperature The temperature is 30°C, and the gas flow rate of the mixed gas is 300 liters / minute. The average particle size of the obtained superfine calcium carbonate was 0.5 μm, and the particles smaller than 2 μm accounted for 93% of the total particle number.

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Abstract

The invention provides a method for preparing light calcium carbonate by using flue gas. The method comprises the following steps: collecting the boiler flue gas, and removing flue-gas impurities by virtue of a purifying dust remover; desulfurizing by use of a supersaturated solution of sodium bicarbonate; by virtue of an absorbing tower adopting octyl silica gel as an absorbing agent, obtaining purified boiler flue gas by virtue of the pressure-swing adsorption step; introducing the purified boiler flue gas into calcium hydroxide aqueous slurry to carry out the carbonization step, thereby obtaining the slurry containing the light calcium carbonate, wherein the volume concentration of the carbon dioxide in the purified boiler flue gas reaches 75-95%. The method provided by the invention has the advantages that after being purified and enriched, the boiler flue gas is used for synthesizing the light calcium carbonate by virtue of a carbonization method, the obtained light calcium is used for a paper making filler or a paper making coating pigment so as to replace imported kaolin and calcined kaolin with expensive price, the produced paper is high in whiteness, good in ink absorption, and the production cost is low; after purification, the harmful gases such as sulfur dioxide are removed, so that the purpose of clean production is achieved.

Description

technical field [0001] The invention relates to a calcium carbonate production technology, in particular to a method for preparing light calcium carbonate by carbonization of carbon dioxide in flue gas. Background technique [0002] Boiler flue gas mainly contains a large amount of nitrogen, carbon dioxide and a small amount of carbon monoxide, sulfur dioxide and traces of harmful gases and smoke and other substances. CN1085188A discloses a kind of technology that industrial flue gas is used for producing light calcium carbonate, and it does not directly react with limewater to produce calcium carbonate precipitation after the flue gas is purified and dedusted without separation. Calcium hydroxide reacts to form calcium sulfite precipitates, resulting in low purity of the light calcium product and affecting subsequent application effects. Contents of the invention [0003] The purpose of this invention is to provide a kind of method for preparing light calcium carbonate w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 施晓旦田雨田久旺
Owner SHANGHAI DONGSHENG NEW MATERIALS