Building material prepared by synergistic carbonization of steel slag, desulfurized gypsum and fly ash and method

Abstract

The invention belongs to the field of solid waste building materials, and particularly relates to a building material prepared by synergistic carbonization of steel slag, desulfurized gypsum and fly ash and a method. The building material is prepared from the following raw materials of steel slag, desulfurized gypsum, fly ash, sodium carbonate, ammonium bicarbonate, fine aggregate, coarse aggregate, a retarder, a water reducing agent and a defoaming agent and according to the following process: adding water into the raw materials, conducting stirring vibrating or compression molding for 2-4 hours, then conducting demolding, putting a test piece into a reaction kettle, controlling the temperature, humidity, pressure and CO2 volume concentration of the reaction kettle, and carrying out low-temperature and high-temperature two-stage carbonization maintenance to obtain the building material. According to the invention, a carbonization excitant is used for promoting the synergistic carbonization of the steel slag, the desulfurized gypsum and the fly ash, so that the carbonization conversion rate and efficiency are improved, and an effective method is provided for resource utilization ofsolid wastes of the steel slag, the desulfurized gypsum and the fly ash and preparation of the building material by capturing industrial waste gas CO2.

Description

technical field [0001] The invention belongs to the field of solid waste building materials, in particular to a building material and a method prepared by synergistic carbonization of steel slag-desulfurized gypsum-fly ash. Background technique [0002] With the development of my country's iron and steel industry, the output of steel slag has increased rapidly. The large amount of storage of steel slag not only wastes resources but also brings great pollution to the environment. Steel slag has certain gelling activity and can be used as low-grade "cement". However, the content of free CaO and free MgO in steel slag is high, which leads to stability problems in the preparation of cementitious materials from steel slag. Overall, the resource utilization rate of steel slag in my country is relatively low. [0003] According to different combustion technologies, fly ash has great differences in properties. Ordinary fly ash formed by ordinary pulverized coal furnace combustion...

AI Technical Summary

Problems solved by technology

The above four patents use steel slag and desulfurized gypsum or natural gypsum as the main raw materials for carbonization reaction, and use an atmospheric carbonization box for carbonization curing, which has disadvantages such as long carbonization curing time, small amount of carbon fixation, and low carbonization conversion rate of calcareous materials in solid waste. , it takes several days for the carbonization curing strength to reach above 15-50MPa

Images