Method of using coal ash to product aerated concrete

Abstract

The invention relates to a method of using coal ash to product aerated concrete and preparation technology thereof. The aerated concrete comprises, by mass, 50-70% of coal ash, 10-20% of Portland cement, 5-20% of quick lime and 5-10% of dihydrate gypsum. Compared with the prior art, the method has the advantages that the coal ash is utilized massively to produce the aerated concrete, so that recycling is realized, and expensive treatment expense can be lowered substantially; metal aluminum ingredient is utilized fully.

Description

technical field [0001] The invention relates to a composite material, in particular to a method for producing air-entrained concrete with fly ash and its preparation technology. Background technique [0002] With the rapid development of my country's economy, power plants and urban heating projects continue to increase, and the output of fly ash also increases. In 2006, my country's thermal power plants alone produced about 240 to 290 million tons of fly ash and 0.2 to 30 million tons of slag, ranking first in the world. At present, the utilization rate of fly ash in western developed countries has reached more than 80%, while in our country it is only about 30% to 40%. Most of the unused fly ash is discharged into ash storage plants, landfills or rivers, lakes and seas. The accumulation of fly ash not only occupies a large amount of land, but also causes serious pollution to the surrounding environment and destroys the ecological balance. Therefore, it is increasingly im...

AI Technical Summary

Problems solved by technology

For example: a) Fly ash and its products fluctuate greatly in performance, lack durability, and low degree of resource utilization; b) The product grade is slightly low, and the profit margin of the enterprise is low, which affects the enthusiasm of the enterprise; c) The utilization method is relatively single, and the main channel It is still road construction, building materials, concrete and cement, etc., and is greatly affected by seasons, and the comprehensive utilization rate is low, with significant regional differences; d) In the process of comprehensive utilization, there are still some negative impacts on the environment, Such as the dust pollution of ash storage yards and transport vehicles, the treatment of waste residues after extracting useful substances, the accumulation of heavy metals in the agricultural process, and the radioactivity of building materials, etc.