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Method for preparing iron-base inhibitor from converter steel slag and application thereof

A converter steel slag and inhibitor technology, which is applied in the field of preparing coal-fired nitrogen oxide inhibitors, can solve the problems of unreported, low added value of steel slag, restrictions, etc., and achieve good emission suppression effects, lower emission costs, and emission reduction effects obvious effect

Active Publication Date: 2017-02-01
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Description
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Problems solved by technology

The former belongs to the utilization mode of low added value of steel slag; the latter belongs to the utilization mode of higher added value, but is limited due to the high amount of P in steel slag
Therefore, in view of the current dual problems of metallurgical steel slag solid waste discharge and coal-burning air pollution in my country, from the perspective of "pollution control with waste", it is found that the main components of the solid waste "metallurgical steel slag" discharged by the metallurgical industry are Fe, Al, Both Mg and trace transition metal elements are components of coal-fired Fe-based nitrogen oxide inhibitors. Since they act as catalysts for coal combustion, they interact with components that are prone to generate nitrogen oxides in coal to achieve synergistic inhibition of NO. The effect of emissions, and the application of this solid waste system to the field of controlling coal-fired nitrogen oxide emissions has not yet been reported

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  • Method for preparing iron-base inhibitor from converter steel slag and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Take 100g of converter slag with a particle size below 200 mesh, add sulfuric acid to adjust the pH value to 2, stir for 30 minutes, and make the Ca particles in the solution dissolve in the form of CaSO 4 Precipitate in the form of precipitation, filter with suction, wash the filter cake twice, and filter with suction until there is no suspended matter in the filtrate, so as to effectively remove CaSO 4 , and then dropwise add hydrogen peroxide in the filtrate, so that Fe in the solution 2+ Fully oxidized to Fe 3+ , and then add ammonia water dropwise to adjust the pH value to 5, so that Fe and traces of Al, Mg and other elements are precipitated in the form of hydroxide precipitation and filtered to obtain a precipitate. Finally, the precipitate is acidified with hydrochloric acid. The pH value of the acid solution is 2. Afterwards, heat to raise the solution temperature to 80°C, add evaporated water during the acidolysis process, keep the acidolysis liquid level unc...

Embodiment 2

[0024] Take 100g of converter slag with a particle size below 200 mesh, add sulfuric acid to adjust the pH value to 3, stir for 30min, and make the Ca particles in the solution dissolve in the form of CaSO 4 Precipitate in the form of precipitation, filter with suction, wash the filter cake twice, and filter with suction until there is no suspended matter in the filtrate, so as to effectively remove CaSO 4 , and then dropwise add hydrogen peroxide in the filtrate, so that Fe in the solution 2+ Fully oxidized to Fe 3+ , and then add ammonia water dropwise to adjust the pH value to 6, so that Fe and traces of Al, Mg and other elements are precipitated in the form of hydroxide precipitation and filtered to obtain a precipitate. Finally, the precipitate is acidified with hydrochloric acid. The pH value of the acid solution is 3. Then heat to raise the solution temperature to 90°C, add evaporated water during the acidolysis process, keep the acidolysis liquid level unchanged, afte...

Embodiment 3

[0026] Take 100g of converter slag with a particle size below 200 mesh, add sulfuric acid to adjust the pH value to 4, stir for 30min, and make the Ca particles in the solution dissolve in the form of CaSO 4 Precipitate in the form of precipitation, filter with suction, wash the filter cake twice, and filter with suction until there is no suspended matter in the filtrate, so as to effectively remove CaSO 4 , and then dropwise add hydrogen peroxide in the filtrate, so that Fe in the solution 2+ Fully oxidized to Fe 3+ , and then add ammonia water dropwise to adjust the pH value to 7, so that Fe and traces of Al, Mg and other elements are precipitated in the form of hydroxide precipitation and filtered to obtain a precipitate. Finally, the precipitate is acidified with hydrochloric acid. The pH value of the acid solution is 4. Then heat to raise the solution temperature to 100°C, add evaporated water during the acidolysis process, keep the acidolysis liquid level unchanged, aft...

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Abstract

The invention discloses a method for preparing an iron-base inhibitor mainly from a metallurgical converter steel slag extract and application of the inhibitor in inhibiting coal NO emission, belonging to the technical fields of solid waste high-added-value utilization and pollution control. The method comprises the following steps: decomposing complex components in the converter slag by acidification-precipitation dissolution, firstly removing Ca, using the Fe, Al and other components capable of inhibiting NO generation, which exist in an acid hydrolysis solution in the form of ions, as element sources for preparing the NO inhibitor, and finally, adding hydrochloric acid to precipitate, thereby obtaining the target product. The method overcomes the limit of single dependence on chemical reagents and non-renewable resources in the prior art, fully utilizes the valuable components in the metallurgical solid waste, and provides a new way for high-added-value utilization of iron-containing metallurgical steel slag on the premise of lowering the preparation cost and reducing the oxynitride emission.

Description

technical field [0001] The invention belongs to the technical field of solid waste comprehensive utilization and pollution control, and in particular relates to a method for preparing a coal-fired nitrogen oxide inhibitor by using converter steel slag as a main raw material. Background technique [0002] 60% of the nitrogen oxides (NOx) emitted into the atmosphere in my country every year come from coal combustion. It can be seen that NOx is one of the important pollutants produced in the process of coal combustion, and the NOx emitted by power plant boilers accounts for 20% of the NOx emitted by coal combustion. More than 40%, more than 90% of the NOx produced by coal combustion is NO. Therefore, it is of long-term significance to develop additives that can effectively suppress NO emissions from coal combustion. [0003] At present, the coal-burning nitrogen oxide inhibitors based on experimental research and commercialization at home and abroad are all prepared from chemic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L9/10
CPCC10L9/10C10L2230/08
Inventor 龙红明高志芳春铁军狄瞻霞孟庆民王平
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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