Method for preparing glass ceramic material with high-calcium sulfur-fixing flyash

Abstract

The invention relates to a method for preparing a glass ceramic material with high-calcium sulfur-fixing flyash. The actual addition rate of flyash in existing vitrification of flyash of a pulverized coal furnace and preparation of glass ceramic materials is low. The method is characterized by comprising the steps of (1), using high-calcium sulfur-fixing flyash as a main material, adding SiO2 auxiliary material and / or CaO auxiliary material into the main material, and mixing well to obtain a mixture, wherein in the mixture, Al2O3 is <15%, 40%<SiO2<60% and 20%<CaO<45%; (2), adding the mixture into a resistance melting furnace, and melting it into glass melt; (3), water-quenching the glass melt to obtain slag; (4), drying, crushing and grinding the slag to a particle size of 0.5 mm and below, and loading to a refractory mold; (5), nucleating, and crystallizing; (6) demolding, grinding and polishing to obtain the finished product. The solid waste high-calcium sulfur-fixing flyash can be effectively utilized to a maximum extent.

Description

technical field [0001] The invention relates to a method for disposing and reusing high-calcium-sulfur-fixing fly ash, in particular to a method for preparing glass-ceramic materials with high-calcium-sulfur-fixing fly ash, which belongs to the field of disposal and comprehensive utilization of industrial solid waste . Background technique [0002] High-calcium sulfur-fixing fly ash and slag are mixed with sulfur-containing coal and sulfur-fixing agent (usually limestone powder) in a certain proportion in the production process of ordinary circulating fluidized bed furnace or pressurized circulating fluidized bed furnace, The solid waste produced after burning sulfur in the bed boiler at 875℃~950℃. Because it belongs to medium-temperature combustion, a large amount of desulfurizer is added in the combustion process, resulting in a large difference between the obtained high-calcium sulfur-fixed fly ash and ordinary pulverized coal furnace fly ash, such as CaO, SO 3 High con...

AI Technical Summary

Problems solved by technology

CaO-Al is generally used in China 2 o 3 -SiO 2 system, but because the CaO content in the fly ash of the pulverized coal furnace is low, in order to adjust the product composition or improve the viscosity, a certain amount of CaO needs to be added, so the actual addition ratio of the fly ash is low

In addition, if the publication date is October 9, 2013, the Chinese patent with the publication number CN103342465A discloses a method for preparing glass ceramics by using red mud and fly ash, and if the publication date is November 28, 2012 In the Chinese patent whose publication number is CN102795773A, a method for preparing glass ceramics by compounding lime mud and fly ash is disclosed. Another example is that the publication date is November 11, 2009, and the publication number is CN101575171. In the Chinese patent, A method for preparing glass ceramics from boron mud fly ash is disclosed. In these methods, the actual addition ratio of fly ash is also low, and the utilization rate of fly ash is not high

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