Negative carbon steel slag baking-free brick as well as preparation method and application thereof

Abstract

The invention discloses a negative carbon steel slag baking-free brick as well as a preparation method and application thereof. The steel slag with the particle size smaller than 0.075 mm is subjected to ball milling to obtain steel slag superfine powder; the method comprises the following steps: carrying out carbonization treatment on steel slag with the particle size of 0.075-4.75 mm to obtain a carbonized product; the carbonized product, a cementing material, steel slag ultrafine powder and an auxiliary cementing material are mixed and stirred uniformly, a mixture is obtained, and the carbonized product accounts for 57 wt%-63 wt% in the mixture; the binding material accounts for 13 wt%-18 wt%; the superfine steel slag powder accounts for 15.5 wt%-20.0 wt%, and the auxiliary cementing material accounts for 6 wt%-8 wt%; the auxiliary cementing material comprises water, a binder and a water reducing agent; and carrying out compression molding on the mixture, and then carrying out maintenance treatment to obtain the negative carbon steel slag baking-free brick. The negative carbon steel slag baking-free brick disclosed by the invention is short in forming period and high in strength; the steel slag contains free calcium oxide, so that CO2 in the atmosphere can be absorbed, carbon reduction and carbon loading are achieved, and a certain positive influence on the environment is achieved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a carbon-negative steel slag unfired brick and a preparation method and application thereof. Background technique [0002] The development of the construction industry has led to a sharp increase in the demand for cement and stone. The calcination of cement and the use of stone have caused a shortage of natural resources and serious environmental problems. [0003] As a solid waste of steelmaking process, steel slag has the properties of hard and wear-resistant, rough and anti-slip, and gelling activity. The unburned bricks prepared by replacing natural aggregates have the advantages of high strength, anti-slip and wear resistance, and rain erosion resistance. . In addition, since steel slag is rich in basic oxide components, such as calcium oxide, magnesium oxide, etc., and has a large number of connected pores, it is beneficial to absorb CO in the air. ...

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Problems solved by technology

[0004] At present, there are domestic precedents of using steel slag in cement bricks, such as Chinese patent CN 106316298A "a preparation method for ordinary Portland cement bricks" and Chinese patent CN 106278073A "a preparation process for filling slag Portland cement bricks". Steel slag micropowder and cement are used to prepare cement bricks according to a certain ratio, but the limitation is that steel slag is only used as micropowder filler, and the overall cement accounts for a large proportion, all of which belong to the category of cement bricks

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