Composite alkali-resistant refractory brick of pulverized fuel ash

Abstract

The invention provides a composite alkali-resistant refractory brick of pulverized fuel ash, wherein the composite brick is applied to the inner lining of an industrial kiln and is prepared by providing refractory aggregate, refractory powder, light aggregate, refractory clay, aluminate cement and silica micropowder to the pulverized fuel ash of solid wastes of a fuel electric plant and the coal cinder after burning, then adding water into the same and mixing, and then pressing and drying. The composite alkali-resistant refractory brick of pulverized fuel ash is composed of compact refractory material components and heat insulation material components. The percentages by weight of the compact refractory material components are as follows: the refractory aggregate is 55 to 65 %, the pulverized fuel ash is 5 to 8 %, the refractory powder is 10 to 15 %, the silica micropowder is 4 to 6 % and the aluminate cement is 8 to11 %; the percentages by weight of the heat insulation material components are as follows: the coal cinder is 50 to 65 %, the pulverized fuel ash is 5 to 10 %, the light aggregate is 5 to 10 %, the refractory clay is 5 to 8 %, the refractory powder is 10 to 16 %, the silica micropowder is 3 to 5 % and the aluminate cement is 7 to 10 %; and the compact refractory material components and the heat insulation material components of the composite alkali-resistant refractory brick of pulverized fuel ash provided by the invention are pressed into a tightly combined compound. Compared with common refractory brick, the composite alkali-resistant refractory brick of pulverized fuel ash provided by the invention has the advantages that a heat insulation layer is increased, the temperature for the skin of the rotary kiln can be reduced, a great quantity of energy can be saved and the service life of the kiln is prolonged.

Description

Technical field: [0001] The invention belongs to refractory materials, in particular to a fly ash composite alkali-resistant refractory brick used for the lining of industrial kilns. Background technique: [0002] Fly ash is one of the largest industrial wastes in my country, and it is a solid waste discharged from the combustion of coal in thermal power plant boilers. With the continuous increase of thermal power generation capacity, the discharge of fly ash is also increasing. At this stage, my country's annual discharge has reached more than 100 million tons. [0003] Stacking is the main way to deal with fly ash at present. The stacking of fly ash not only occupies land resources, but also consumes more yard construction and maintenance costs, and damages the ecological environment, causing serious pollution, endangering the natural environment and human health, and at the same time The useful components of fly ash cannot be used, which is also a waste of resources. ...

AI Technical Summary

Problems solved by technology

However, in the application of large-scale alumina calcining rotary kiln, cement calcining rotary kiln and other rotary industrial kilns, often due to the different materials and large differences in density of the two bricks, delamination and dislocation will occur during the operation of the rotary kiln, resulting in the structure of the furnace. damage, had to reduce the service life of the kiln, and overhauled in advance

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