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Method for preparing calcium carbonate in different grain sizes

A technology of calcium carbonate and particle size, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of increasing process steps and equipment investment, and achieve the effects of resource reduction, low cost and abundant sources.

Inactive Publication Date: 2013-06-26
杨晓林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the inventions of using calcium carbide slag and other alkaline wastes to prepare calcium carbonate with different particle sizes include a method for preparing ultrafine calcium carbonate with carbide slag (CN1854069), a method for preparing fine and ultrafine calcium carbonate with different crystal forms from calcium carbide slag (CN101264920) etc., but CN101264920 method has new by-product sodium chloride to generate, and the processing of sodium chloride has increased processing step and equipment input

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The slurry is prepared by mixing calcium carbide slag: water (mass ratio) = 1:15. Add 2.5mol / L ammonium chloride solution under stirring to dissolve until the pH of the solution reaches about 8. Filter to obtain a mixed solution of calcium chloride and ammonia water, the solution concentration is 4%. in a dedicated CO 2 In the tubular absorber, sodium dodecylbenzenesulfonate is added in the filtrate, and the addition of sodium dodecylbenzenesulfonate is controlled to be 0.2% of the calcium carbonate quality of generation. Control the flow velocity of the absorbing liquid to 2.5m / s. Then feed 6% (volume ratio) CO into the reactor 2 Gas, the gas flow rate is 15m / s, and the reaction temperature is controlled at 4°C. After the reaction, filter and dry to obtain calcite-type calcium carbonate.

Embodiment 2

[0019] The slurry is prepared by mixing calcium carbide slag: water (mass ratio) = 1:20. Add 3.0mol / L ammonium chloride solution under stirring to dissolve until the pH of the solution reaches about 8. Filter to obtain a mixed solution of calcium chloride and ammonia water, the solution concentration is 5%. in a dedicated CO 2 In the tubular absorber, add sodium stearate in the filtrate, control the add-on of sodium stearate to be 0.2% of the calcium carbonate quality that generates. Control the flow velocity of the absorbing liquid to 2.5m / s. Then feed 15% (volume ratio) CO into the reactor 2 Gas, the gas flow rate is 20m / s, and the reaction temperature is controlled at 12°C. After the reaction, filter and dry to obtain vaterite type calcium carbonate.

Embodiment 3

[0021] The slurry is prepared by mixing calcium carbide slag: water (mass ratio) = 1:20. Add 3.0mol / L ammonium chloride solution under stirring to dissolve until the pH of the solution reaches about 8. Filter to obtain a mixed solution of calcium chloride and ammonia water, the solution concentration is 5%. in a dedicated CO 2 In the tubular absorber, add sodium stearate in the filtrate, control the add-on of sodium stearate to be 0.2% of the calcium carbonate quality that generates. Control the flow velocity of the absorbing liquid to 4m / s. Then feed 25% (volume ratio) CO into the reactor 2 Gas, the gas flow rate is 20m / s, and the reaction temperature is controlled at 80°C. After the reaction, filter and dry to obtain aragonite calcium carbonate.

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PUM

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Abstract

The invention relates to a method for preparing calcium carbonate in different grain sizes by utilizing alkaline wastes. The method comprises the steps of mixing the alkaline wastes with a certain weight of water, then adding ammonium chloride solution to dissolve the product to prepare calcium chloride solution and introducing CO2 to generate calcium carbonate precipitates. According to the method, in a special tubular reactor, the reaction time for absorbing carbon dioxide by the alkaline wastes and the retention time of the products in the reactor is controlled by adjusting the fluid flow rate and the reaction temperature is also controlled, so as to prepare calcium carbonate in different grain sizes. The method has the beneficial effects that the process is simple; new byproducts are not generated; the ammonium chloride solution can be recycled; and the method is a new economical and environment-friendly process.

Description

technical field [0001] The invention relates to a new method for preparing calcium carbonate, in particular to a method for preparing calcium carbonate with different particle sizes by controlling the flow rate of reactants and controlling the reaction time of carbon dioxide in a special tubular reactor. Background technique [0002] Facing the crisis situation of increasing carbon dioxide emissions year by year and intensifying the greenhouse effect, new inventions in the study of carbon dioxide emission reduction technologies have emerged in recent years. Among them, the use of alkaline waste to absorb carbon dioxide is widely used because of its environmental protection and low cost. At present, the inventions of using calcium carbide slag and other alkaline wastes to prepare calcium carbonate with different particle sizes include a method for preparing ultrafine calcium carbonate with carbide slag (CN1854069), a method for preparing fine and ultrafine calcium carbonate wi...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 杨晓林
Owner 杨晓林
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