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Method for mineralizing and fixing carbon dioxide by using strengthened steel slag

A technology for strengthening steel and steel slag, applied in chemical instruments and methods, separation methods, calcium carbonate/strontium/barium, etc., can solve the problems of difficult and effective use of steel slag carbon fixation products, long reaction time, low conversion rate, etc., to achieve Large amount of CO2 fixed per unit mass of steel slag, short reaction time and high conversion rate

Inactive Publication Date: 2015-06-03
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is: provide a kind of strengthened iron and steel slag mineralization fixed CO 2 method, and effectively solve the problems of long reaction time, high energy consumption, low conversion rate and difficult to effectively use the carbon-fixed products of steel slag during the carbonation process of calcium-containing components in steel slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The main components of the steel slag used in this example are: ~45% CaO, ~10% MgO, ~20% SiO 2 , ~20% FeO, and ~5% other impurities, the specific process is as follows:

[0035] 1) The steel slag is mechanically crushed and screened to a particle size of 10 meshes to obtain steel slag particles;

[0036] 2) Dissolve 100 grams of sodium hydroxide in 900 grams of water, as a strengthened steel slag to mineralize and fix CO 2 the catalyst;

[0037] 3) Take 40 grams of steel slag particles obtained in step 1) and 40 grams of catalyst obtained in step 2), put them into a high-pressure stirred tank, stir and mix evenly, and heat to make the temperature reach 150°C, and the concentration of feed is 100% CO 2 Gas, and keep the gas flue gas at 1 bar, start the carbonation reaction, keep the reaction for 60 minutes, stop heating and stirring, and the carbonation reaction stops;

[0038] 4) discharge all the mixtures after the reaction in the autoclave, and obtain the steel sl...

Embodiment 2

[0046] The main components of the steel slag used in this example are: ~45% CaO, ~10% MgO, ~20% SiO 2 , ~20% FeO, and ~5% other impurities, the specific process is as follows:

[0047] 1) The steel slag is mechanically crushed and screened to a particle size of 200 mesh to obtain steel slag particles;

[0048] 2) Dissolve 10 grams of sodium hydroxide in 990 grams of water, as a strengthened steel slag to mineralize and fix CO 2 the catalyst;

[0049] 3) Take 40 grams of steel slag particles obtained in step 1) and 400 grams of catalyst obtained in step 2), put them into a high-pressure stirring tank, stir and mix evenly, and heat to make the temperature reach 50°C, and the concentration of feed is 10% CO 2 Gas, and keep the gas flue gas at 20bar, start the carbonation reaction, keep the reaction for 30 minutes, stop heating and stirring, and the carbonation reaction stops;

[0050] 4) discharge all the mixtures after the reaction in the autoclave, and obtain the steel slag...

Embodiment 3

[0058] The main components of the steel slag used in this example are: ~45%CaO, ~10%MgO, ~20%SiO 2 , ~20% FeO, and ~5% other impurities, the specific process is as follows:

[0059] 1) The steel slag is mechanically crushed and sieved to a particle size of 100 mesh to obtain steel slag particles;

[0060] 2) Dissolve 50 grams of sodium hydroxide in 950 grams of water, as a strengthened steel slag to mineralize and fix CO 2 the catalyst;

[0061] 3) Take 100 grams of steel slag particles obtained in step 1) and 400 grams of catalyst obtained in step 2), and put them together in a high-pressure stirring tank, stir and mix evenly, and heat to make the temperature reach 100°C, and the concentration of feed is 10% CO 2 Gas, and keep the gas flue gas at 10bar, start the carbonation reaction, keep the reaction for 10 minutes, stop heating and stirring, and the carbonation reaction stops;

[0062] 4) discharge all the mixtures after the reaction in the autoclave, and obtain the st...

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Abstract

The invention relates to a method for mineralizing and fixing CO2 by using strengthened steel slag. By using a large amount of steel slag which is generated in the production process of the steel industry and is difficult to treat as a raw material and adding an alkali-containing metal salt catalyst, a calcium oxide component in strengthened steel slag reacts with CO2, thereby improving the conversion rate of the calcium oxide component in the steel slag and the carbon fixing efficiency of the steel slag. In addition, the carbon-fixed steel slag can serve as steel slag micropowder for a concrete admixture, thereby realizing the full-component recycling of the steel slag and increasing the added value of the steel slag. By using the method provided by the invention, the time of CO2 mineralizing and fixing by the steel slag can be obviously shortened, the energy consumption in CO2 mineralizing and fixing by the steel slag can be reduced, and the efficiency of CO2 mineralizing and fixing by the steel slag can be enhanced; and the carbon-fixed steel slag can be used for the production of steel slag micropowder products, thereby further increasing the use value of the steel slag. Thus, the invention has favorable economic benefits and wide industrial application prospects.

Description

technical field [0001] The invention belongs to waste resource utilization, greenhouse gas CO 2 In the technical field of emission reduction and resource utilization, it particularly relates to a method of using steel slag as a raw material to fix CO by strengthening the mineral carbonation reaction process. 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 2 mineral absorption process using alkali...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/62C01F11/18
Inventor 包炜军李会泉潘凯王晨晔
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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