Coal ash sintered brick and sintering process

Abstract

The invention relates to a coal ash sintered brick and a sintering process, which belong to the technical field of material engineering. The sintered brick is made in the following steps: sodium metasilicate and sodium carbonate which are used as exciting agents are added into coal ash to form a geopolymer, and Si-O-Al bond formed by the geopolymer is used as a net support frame to sinter ceramic at high temperature. The sintered brick consists of coal ash, sodium metasilicate with modulus of 1-3.5, and sodium carbonate. The sintering process comprises the following steps: (1) burdening; (2) molding; (3) sintering; and (4) product inspection: picking out rejected products and obtaining the qualified pure coal ash brick. The sintering process provided by the invention has the advantages that ingredients and blanks not containing clay protect cultivated land and clay resources, various sintered bricks sintered by the sintering process is low in cost, has high compressive strength and breaking strength, and low water absorption and even have high strength at 1000 DEG C, and the coal ash contains a large amount of unburned carbon, thereby saving part of fuel. An insulation board can be sintered with the sintering process by an insulation board mold according to the ingredient proportion.

Description

technical field

[0001] The invention belongs to the technical field of material engineering and relates to a wall material production technology. Background technique

[0002] Various types of fired bricks currently used in the market are mixed with a certain amount of clay, which seriously damages cultivated land. For this reason, the country has issued many policies to restrict its use. Moreover, due to the different soil properties in different regions, the strength and flexural resistance of the fired bricks are different, and the quality of the bricks varies from place to place; compared with autoclaved bricks, cement bricks and blocks, fired bricks have lower strength and higher water absorption. , susceptible to alkali corrosion and weathering. There are the following defects and deficiencies in the proportion of raw materials of several types of sintered bricks: clay bricks, shale bricks, coal gangue bricks, fly ash bricks, lime sand bricks, sintered porous bricks a...