Method for fixing carbon dioxide and digesting free calcium oxide in slag micro powder

A technology of free calcium oxide and steel slag micropowder, applied in separation methods, chemical instruments and methods, calcium carbonate/strontium/barium, etc., to achieve the effects of improving work performance and durability, reducing emissions and improving stability

Inactive Publication Date: 2010-10-06
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, there is no process at home and abroad to use the process of producing steel slag powder to absorb carbon dioxide and digest free calcium oxide in steel slag powder

Method used

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  • Method for fixing carbon dioxide and digesting free calcium oxide in slag micro powder
  • Method for fixing carbon dioxide and digesting free calcium oxide in slag micro powder

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Example 1: Add 5 kg of steel slag tailings with a free calcium oxide content of 6.26% into the ball mill, add 5 kg of water, and feed CO 2 The content is 800mg / Nm 3 , the flow rate is 1.8Nm 3 / h of CO 2 Mixed gas with air, treatment time is 1 hour. The free calcium oxide content of the treated steel slag fine powder is 1.62%, and the free calcium oxide digestion rate reaches 74.1%. Using this method, 36.5kg of carbon dioxide can be fixed per ton of steel slag.

Embodiment 2

[0024] Example 2: Add 5 kg of steel slag tailings with a free calcium oxide content of 6.26% into the ball mill, add 5 kg of water, and feed CO 2 The content is 800mg / Nm 3 , the flow rate is 1.8Nm 3 / h of CO 2 Mixed gas with air, treatment time is 3 hours. The free calcium oxide content of the treated steel slag fine powder is 0.10%, and the free calcium oxide digestion rate reaches 98.4%. Using this method, 48.4kg of carbon dioxide can be fixed per ton of steel slag.

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Abstract

The invention relates to a method for fixing carbon dioxide and digesting free calcium oxide in slag micro powder, which belongs to the technical field of the carbon dioxide reduction and the industrial solid waste resource utilization. Converter steel slag is soaked in water, then the steel slag after being soaked in the water is added into a grinding machine, at the same time, waste heat smoke gas containing carbon dioxide is introduced into the grinding machine with the steel slag to carry out the stabilization reaction, and the steel slag is ground and dried; the waste heat smoke gas brings out the steel slag micro powder after being ground and dried from the tail section of the grinding machine to enter a power collection device, and the steel slag micro powder is discharged from the bottom part of the powder collection device; and the temperature of the waste heat smoke gas is 150 to 180 DEG C. The method has the advantages that: carbon dioxide in the waste smoke gas is used for chemically modifying the steel slag micro powder, so the content of the f-CaO is reduced, the chemical stability of the steel slag micro powder is improved, and technical requirements of the national standard GB / T 20491 - 2006 of steel slag powder for cement and concrete can be reached. The carbon dioxide also can be cured, so the exhaustion of the greenhouse gas can be reduced, and the environment-friendly carbon cycling mode can be realized.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide emission reduction and resource utilization of industrial solid waste, and in particular provides a method for carbon dioxide fixation and free calcium oxide digestion in steel slag micropowder, which stabilizes steel slag and fixes emissions from industrial production processes. Carbon dioxide, a method for rapidly reducing the content of free calcium oxide (f-CaO) in steel slag fine powder. technical background [0002] Converter slag is solid waste produced in the steelmaking process, with an output of 100-150kg / ton of steel. my country is a big country in steel production, with an annual production of about 500 million tons of steel and 50 million tons of converter slag. At present, most of the steel slag after magnetic separation is mainly used as building materials. Free calcium oxide (f-CaO) in steel slag is an important limiting condition affecting steel slag as a building materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B5/06C01F11/18B01D53/83B01D53/62
CPCB01D2257/504B01D2251/404Y02P20/129
Inventor 廖洪强唐卫军李世青周宇赵文娟冯仕章李冀闽
Owner SHOUGANG CORPORATION
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