Sulfur-fixed ash ceramsite and preparation method thereof

Abstract

The invention belongs to the field of sintered solid waste building materials, and specifically relates to sulfur-fixed ash ceramsite and a preparation method thereof, which are prepared according to the following raw material mass ratios and processes: 9-59 parts of sulfur-fixed ash, 20-66 parts of sludge, 8-33 parts of magmatic soil, 4-10 parts of perlite tailings powder; 1-4 parts of aluminum ash; 1-4 parts of limestone powder; 2-8 parts of glass powder; 4 parts of phosphate adhesive. First, dehydrate the sludge to a moisture content of 17% to 56%, dry the sulfur-fixing ash and aluminum ash with waste heat, mix all the powders according to the mass ratio and spray the phosphate adhesive to obtain a wet mixture, and then age, Vacuum smelting, extruding and granulating, drying ceramsite blanks, and finally roasting and sieving to obtain sulfur-fixing ash ceramsite. The invention makes full use of the high-temperature sintering characteristics of the sulfur-fixed ash, improves the resource utilization rate of the sulfur-fixed ash, and realizes the coordinated disposal of multiple solid wastes. The prepared sulfur-fixed ash ceramsite can be widely used in building materials.

Description

technical field [0001] The invention belongs to the field of sintered solid waste building materials, and in particular relates to sulfur-fixed ash ceramsite and a preparation method thereof. Background technique [0002] At present, the sulfur-fixed ash generated by fluidized bed combustion technology in my country is about 80 million tons per year. Compared with the fly ash and slag produced by ordinary coal-fired power plants, sulfur-fixed ash has essential differences in chemical composition and microscopic morphology. Sulfur-fixing ash is rich in calcareous sulfur-fixing components f-CaO and CaSO 4 , so that the sulfur-fixed ash has self-hardening and expansion properties, and it is easy to cause cracking when applied to cement-based materials; the loose porous microstructure and high carbon content of the sulfur-fixed ash lead to an increase in water demand when used in cement-based materials, thus The strength of the material is reduced, and at the same time, the pe...

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Problems solved by technology

In order to make the prepared ceramsite fracturing proppant have higher strength and lower breakage rate under high pressure, the sintering process of sintering at 1200℃~1300℃ for 1.5h~2.5h is adopted, but the prepared ceramsite fracturing proppant The volume shrinkage of the agent is 3% to 8%, and the drying shrinkage and sintering adhesion of the ceramsite occur during the sintering process.

Sintering at 1200℃~1300℃ for 1.5h~2.5h, higher sintering temperature and longer sintering time consume a lot of energy, and the volume shrinkage and sintering adhesion of ceramsite proppant also significantly reduce the yield of ceramsite proppant

As a special material for the oil exploration industry, ceramsite proppant cannot be used in building materials due to its high density, low porosity and high cost

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