Process for producing steel scoria unburned brick

Abstract

The invention discloses a making method of steel slag non-burnt brick, which belongs to steel slag reclamation field; wherein, the technical proposal resolves the problems of the prior steel slag non-burnt brick of requiring maintenance time, requiring pressure in the process of aging, high equipment cost, requiring handling and other multiple operation steps, large amount of labor, and high cost of man power and material resources. The making method of steel slag non-burnt brick is characterized in that (1) at least two materials from steel slag sand, steel slag powder, blast furnace slag and lime are weighed and fed into the blender, (2) water is added and the materials are stirred evenly, (3) the materials are fed into the brick molding press to press and form, (4) the formed brick is processed aging at the atmospheric pressure directly, (5) the industrial exhaust gas comprising CO2 is injected in the process of aging, and (6) the finished steel slag non-burnt brick is acquired as the process of aging is completed. The making method of steel slag non-burnt brick has the advantages that maintenance time is unnecessary, the pressure in the process of aging is unnecessary, requirement of equipment is low, the waste gas residual heat is utilized directly, and the cost is low.

Description

technical field [0001] The invention belongs to the field of recycling steel slag, in particular to a method for making steel slag-free bricks. Background technique [0002] Steel slag is the slag discharged during the steelmaking process, mainly the oxides formed after the oxidation of various elements in the metal charge, the eroded furnace lining and repair materials, the impurities brought in by the metal charge, and the smelting of different steel types. Limestone, dolomite, iron ore, fluorite and other slagging materials are specially added. Steel slag accounts for 15-20% of solid waste in the iron and steel industry, and about 180Kg of steel slag will be discharged for every ton of crude steel produced. There are more than 200 million tons of steel slag accumulated in my country, covering an area of ​​more than 10,000 mu. A large amount of steel slag not only invades the land, Moreover, the steel slag is easily weathered into alkaline dust during the stacking process,...

AI Technical Summary

Problems solved by technology

Steel slag accounts for 15-20% of solid waste in the iron and steel industry, and about 180Kg of steel slag will be discharged for every ton of crude steel produced. There are more than 200 million tons of steel slag accumulated in my country, covering an area of ​​more than 10,000 mu. A large amount of steel slag not only invades the land, Moreover, the steel slag is easily weathered into alkaline dust during the stacking process, causing serious pollution to the surrounding environment.

At present, steel slag is mainly used in the field of building materials, such as the production of steel slag cement, cement batch materials, steel slag powder, foundation materials, etc., but the utilization rate is low, accounting for only about 10%, and it is still discharged by millions of tons every year. The amount of slag is increasing. If it is not processed and comprehensively utilized, it will occupy more and more land, which will cause environmental pollution and waste a lot of available resources, thus affecting the sustainable development of the steel industry.

[0003] The applicant has applied for a patent application titled "a steel slag burn-free brick" on 08.1.21, and its application number is 200810014015.8. The raw materials for burning bricks include steel slag sand, steel slag powder, blast furnace slag, and lime. The method for making the steel slag unfired bricks is to mix two or more of the above raw materials according to a certain ratio, mix them with water, and stir them with water. , until the brick press is pressed and formed, and then the finished steel slag unburned brick is obtained after curing and aging. The aging is at room temperature, and the high-pressure steel cylinder is used to store CO 2 Gas requires aging pressure. The disadvantage of this method is that it requires curing time, aging requires pressure, and aging needs to be carried out in an autoclave, which requires relatively high equipment, so the cost of equipment is high, and maintenance requires a lot of time. Space, the factory building occupies a large area, and there are many operations such as handling, the workload is large, and the cost of manpower and material resources is high

Images