Method for preparing autoclaved brick by using refined magnesium slags and fly ash

Abstract

The invention discloses a method for preparing an autoclaved brick by using refined magnesium slags and fly ash. The method comprises the following steps: adopting refined magnesium slags, fly ash and aggregate as basic raw materials; mixing the refined magnesium slags, the fly ash and the aggregate through stirring, adding an exciting agent and water during the stirring process, followed by uniform mixing to obtain a mixing material; standing the mixing material to obtain a digested material; carrying out compression moulding to obtain a green brick after wheel rolling; placing the green brick in a autoclave and carrying out autoclave curing for 3-10 hours at a steam temperature of 150-200 DEG C under a steam pressure of 0.6-1.2 MPa to prepare the autoclaved brick. The method provided by the present invention has advantages of simple process, easy grasp, low production cost, short production period and high work efficiency. In addition, the obtained autoclaved brick prepared through the method provided by the present invention accords with a national standard of building bricks, and is applicable for industrial implementation.

Description

technical field [0001] The invention relates to a method for preparing autoclaved bricks, in particular to a method for preparing autoclaved bricks by using magnesium smelting slag and fly ash. Background technique [0002] my country is one of the major coal-producing countries in the world. Coal is the main energy source for my country at present and for a long time in the future. Coal accounts for 90% of the total proven primary energy. Although the country vigorously develops hydropower and nuclear power, coal-fired power generation still dominates status. Fly ash is the industrial waste residue of thermal power plants. With the rapid development of my country's electric power industry, the discharge of fly ash from thermal power plants has increased sharply year by year. By 2009, it had reached nearly 400 million tons, and the cumulative amount of fly ash stockpiled reached 50. More than 100 million tons. The accumulation of fly ash will not only occupy a large amount o...

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Problems solved by technology

[0004] The above-mentioned two main formulas for producing bricks from waste solids all need to be doped with lime with a mass fraction greater than 10%; as we all know, the lime industry is a high-energy, high-pollution industry, and its pollutants are mainly characterized by dust pollution; according to relevant literature According to the data, my country's lime production consumes about 30 million tons of standard coal per year, and the energy consumption per ton of lime production is greater than 180kg of standard coal, while the emission of dust and other pollutants is even more alarming. Moreover, there are few large-scale enterprises in the lime industry, and most of them are small private enterprises. Enterprises all provide products for the local market, so it is difficult to apply in some areas with less lime resources, and the price of lime is correspondingly higher