Micro-expansive cement prepared from fluidized bed combustion ash, and preparation method of cement

Abstract

The invention provides a micro-expansive cement prepared from fluidized bed combustion ash, and a preparation method of the cement. The micro-expansive cement comprises, by weight, 20-30% of fluidized bed combustion ash, 20-28% of clinker, 17-40% of slag, 20-25% of fly ash and a grinding aid, and the addition amount of the grinding aid is less than or equal to 0.5% of the total mass of the materials. The micro-expansive cement with stable performance is prepared by adjusting the matching proportion of the fluidized bed combustion ash, the clinker, the slag and the fly ash, and has the characteristics of high strength and small dry shrinkage coefficient. The preparation method of the micro-expansive cement effectively consumes the sulfur-fixing ash residues, is economical and energy-saving, not only improves the comprehensive utilization of the solid wastes, but also relieves the pressure of the environment, and accords with the green and environment-friendly concept.

Description

technical field [0001] The invention belongs to the field of materials, and relates to the reuse of sulfur-fixed ash, which is a solid waste produced by a circulating fluidized bed boiler. Specifically, the sulfur-fixed ash, clinker, slag, and fly ash are used as raw materials to add grinding aids together. Grinding to prepare micro-expansion cement and the preparation method of the cement. Background technique [0002] At present, cement concrete expansion agents mainly include sulphoaluminate expansion agents (such as UEA, alunite expansion agent EA-L type, etc.), calcium oxide expansion agents, magnesium oxide expansion agents, and composite expansion agents. The agent can achieve the effect, but its absorption effect on solid waste is limited, and it fails to alleviate the pressure of solid waste discharge on the environment. [0003] Sulfur-fixing ash is produced by burning sulfur-containing coal and limestone and other sulfur-fixing agents in circulating fluidized bed...

AI Technical Summary

Problems solved by technology

[0002] At present, cement concrete expansion agents mainly include sulphoaluminate expansion agents (such as UEA, alunite expansion agent EA-L type, etc.), calcium oxide expansion agents, magnesium oxide expansion agents, and composite expansion agents. The agent can achieve the effect, but the absorption effect on solid waste is limited, and the pressure of solid waste discharge on the environment cannot be alleviated.

[0003] Sulfur-fixing ash is produced by burning sulfur-containing coal and limestone and other sulfur-fixing agents in circulating fluidized bed boilers at about 900°C. The production of slag is increasing year by year, but it has not been fully utilized, and the research and application of sulfur-fixed ash as an expansion agent is less