Steel slag auxiliary cementing material and preparation method and application thereof

Abstract

The invention discloses a steel slag auxiliary cementing material and a preparation method and application thereof. The preparation method comprises the following steps: (1) crushing undisturbed steel slag, selecting iron, and grinding in a mill to obtain steel slag particles; (2) putting the steel slag particles into stirring pretreatment equipment, and mixing and uniformly stirring the steel slag and an additive solution; (3) grinding the pretreated steel slag particles in a grinding machine, and meanwhile, introducing carbon dioxide gas to grind the steel slag particles into steel slag micro powder with a certain particle size; and (4) putting the steel slag micro powder into stirring reaction equipment, and introducing carbon dioxide gas into the reaction equipment to obtain the stabilized and activated steel slag auxiliary cementing material. According to the method, free CaO and part of free MgO are rapidly eliminated, so that the problem of poor stability of the steel slag is solved, the gelling activity of the steel slag is improved to a great extent, it is ensured that the stability of the auxiliary gelling material of the steel slag is qualified when the auxiliary gelling material of the steel slag is doped into cement or concrete, and application of the steel slag in building materials such as cement and concrete is promoted.

Description

technical field [0001] The invention belongs to the field of preparation methods of building materials, and in particular relates to a steel slag auxiliary cementitious material rapidly stabilized and activated by carbon dioxide, a preparation method and application thereof. Background technique [0002] Cement production consumes a lot of resources and emits a lot of carbon dioxide. The cement industry is my country's third largest carbon dioxide emitter, accounting for about 14% of the country's total industrial carbon emissions. In 2020, my country's cement output will reach 2.377 billion tons, and about 1.3 billion tons of carbon dioxide will be emitted. The carbon emission reduction of the cement industry is related to the realization of the national carbon peak and carbon neutral strategic goals. To this end, the academic and industrial circles have proposed and adopted various energy-saving and emission-reduction strategies, such as reducing the amount of cement in ...

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Problems solved by technology

[0005] Technical problem to be solved: Poor wearability of steel slag, low hydration activity, and potential poor stability caused by free CaO and MgO are the fundamental problems restricting steel slag from being used as auxiliary cementitious materials. The invention provides a steel slag auxiliary cement Concrete material and its preparation method and application, using a certain concentration of carbon dioxide to quickly eliminate free CaO and MgO under the catalysis of a specific admixture, and carbonize with calcium and magnesium mineral phases in steel slag to form active mineral phases, thereby improving The stability of steel slag improves the gelling performance of steel slag, and the prepared steel slag auxiliary cementitious material can be used as cement mixture and concrete admixture

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