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Method for mineralization-immobilization of carbon dioxide (CO2) through strengthening calcium-based solid wastes by using ammonia medium system

A calcium-based, medium-based technology, applied in chemical instruments and methods, separation methods, ammonium sulfate, etc., can solve the problems of high energy consumption in the evaporation process of ammonium sulfate mother liquor, large consumption of ammonia medium and sulfuric acid, and low utilization rate , to achieve high CO2 utilization efficiency, less consumption of ammonia medium and sulfuric acid, and short reaction time

Inactive Publication Date: 2013-06-12
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: provide a kind of ammonia medium system to strengthen calcium-based solid waste mineralization and fix CO 2 method, and effectively solve the problem of low conversion rate of calcium components in the carbonation process of industrial gypsum and other calcium-based solid waste, CO 2 Problems such as low utilization rate, large consumption of ammonia medium and sulfuric acid, and high energy consumption in the evaporation process of ammonium sulfate mother liquor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The calcium-based solid waste selected in this example is mainly a large amount of industrial waste phosphogypsum produced in the production process of wet-process phosphoric acid in the chemical fertilizer industry, in which the calcium sulfate content is 60%. The specific process is as follows:

[0037] 1) The phosphogypsum is mechanically crushed and sieved to a particle size smaller than 100 mesh;

[0038] 2) Prepare an ammonium carbonate solution with an ammonia concentration of 1 mol / L as an enhanced phosphogypsum mineralization and fixation of CO 2 ammonia medium;

[0039] 3) Put 100 grams of phosphogypsum obtained from step 1) and 1000 grams of ammonia medium obtained from step 2) into a closed container with stirring and mix well;

[0040] 4) Pre-carbonating the solid-liquid mixture obtained in step 3) with the gas product obtained in step 6);

[0041] 5) Transfer the pre-carbonation reaction material obtained in step 4) to a high-pressure stirred tank, stir ...

Embodiment 2

[0047] The calcium-based solid waste selected in this example is mainly desulfurized gypsum produced in the desulfurization process of the power industry, in which the calcium sulfate content is 65%. The specific process is as follows:

[0048] 1) Desulfurization gypsum is mechanically crushed and sieved to a particle size smaller than 300 mesh;

[0049] 2) Prepare an ammonia solution with an ammonia concentration of 20mol / L as an enhanced phosphogypsum mineralization and fixation of CO 2 ammonia medium;

[0050] 3) Put 100 grams of phosphogypsum obtained from step 1) and 50 grams of ammonia medium obtained from step 2) into a closed container with stirring and mix well;

[0051] 4) Pre-carbonating the solid-liquid mixture obtained in step 3) with the gas product obtained in step 6);

[0052] 5) Transfer the pre-carbonation reaction material obtained in step 4) to a high-pressure stirred tank, stir and mix evenly, and heat to make the temperature reach 60°C, and introduce CO...

Embodiment 3

[0058] The calcium-based solid waste selected in this example is mainly fluorine-containing gypsum produced by the fluorine chemical industry, in which the content of calcium sulfate is 65%. The specific process is as follows:

[0059] 1) The fluorogypsum is mechanically pulverized and sieved to a particle size smaller than 300 mesh;

[0060] 2) Prepare an aqueous solution of ammonium bicarbonate with an ammonia concentration of 10 mol / L as an enhanced phosphogypsum mineralization and fixation of CO 2 ammonia medium;

[0061] 3) Put 100 grams of phosphogypsum obtained from step 1) and 100 grams of ammonia medium obtained from step 2) into a closed container with stirring and mix well;

[0062] 4) Pre-carbonating the solid-liquid mixture obtained in step 3) with the gas product obtained in step 6);

[0063] 5) Transfer the pre-carbonation reaction material obtained in step 4) to a high-pressure stirred tank, stir and mix evenly, and heat to make the temperature reach 100°C, a...

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Abstract

The invention relates to a method for mineralization-immobilization of carbon dioxide (CO2) through strengthening calcium-based solid wastes by using an ammonia medium system. According to the method, the calcium-based solid wastes, such as phosphogypsum and fluorgypsum produced by the chemical engineering industry, desulfurized gypsum produced by the power industry and waste slag produced during the desulfurization of molten iron in the iron and steel industry, are taken as raw materials, in the ammonia medium system, strengthened carbonation reaction conditions, such as high temperature of 60-200 DEG C and high pressure of 1-20bar, and operating steps such as pre-carbonation, strengthened carbonation and flash vaporization are adopted, so that the reaction between a calcium oxide ingredient in the calcium-based solid wastes and CO2 is strengthened, the carbonation conversion ratio of calcium-containing ingredients in the calcium-based solid wastes and the utilization ratio of CO2 are increased, the reaction time for mineralization-immobilization of CO2 by the calcium-based solid wastes is shortened, and the consumption of an ammonia medium and sulfuric acid and the energy consumption during the vaporization of ammonium-sulfate mother liquid are effectively reduced. According to the method, the calcium-based solid wastes can be efficiently converted into calcium carbonate and ammonium sulfate products, the carbonation conversion ratio and the CO2 utilization ratio are high, the consumption of materials, such as the ammonia medium and the sulfuric acid during production is low, and the energy consumption during production is low, so that the method has a good economic benefit and a broad industrial application prospect.

Description

technical field [0001] The invention belongs to waste resource utilization, greenhouse gas CO 2 The technical field of emission reduction and resource utilization, especially relates to a method of using calcium-containing industrial solid waste as a raw material to strengthen the mineral carbonation reaction process through ammonia medium to fix CO 2 Methods. Background technique [0002] CO 2 Global climate change caused by emissions has become a major concern of the world. CO is being carried out extensively at home and abroad 2 Research and development and industrial trials of large-scale disposal technologies. Geological storage, marine storage, and mineralized fixation are CO 2 Primary means of mass disposal. CO 2 Mineralization fixation is not only seen as a way to achieve the greenhouse gas CO 2 An effective way to obtain stable storage is also to achieve CO 2 An effective way for large-scale resource utilization. It refers to the imitation of CO in nature ...

Claims

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Application Information

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IPC IPC(8): C01C1/24C01F11/18B01D53/62
Inventor 包炜军李会泉李松庚王晨晔盛勇张彦英毛克万
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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