A kind of sealing material and construction method for covering disposal of coal gangue hill

Abstract

The invention discloses a sealing material for coverage treatment of coal gangue mountains and a construction method. The sealing material is prepared from solid wastes, an additive and water, whereinthe additive is prepared from an ion curing agent and an exciting agent; the ion curing agent accounts for 0.25 percent to 0.5 percent of the mass of solid wastes, the exciting agent accounts for 0.5percent to 0.75 percent of the mass of the solid wastes and the water accounts for 27.5 percent to 29.3 percent of the mass of the solid wastes; the solid wastes are prepared from the following components in percentage by mass: 50 percent to 60 percent of red mud, 22.5 percent to 35 percent of fly ash, 2.5 to 7.5 percent of desulfurized gypsum and 5 percent to 10 percent of lime; the exciting agent is prepared from 30 percent to 35 percent of polymerized active aluminum, 10 percent to 20 percent of sodium hydroxide, 10 percent to 20 percent of sodium silicate and 35 percent to 40 percent of cement; the ion curing agent is prepared from the following components in percentage by mass: 50 percent to 60 percent of laminar double metal hydroxide and 40 percent to 50 percent of ammonium chloride. According to the sealing material disclosed by the invention, mechanical performance, sealing performance and environment-friendly performance indexes needed by coal gangue mountain treatment are met, and a lot of solid wastes including the red mud, the fly ash and the desulfurized gypsum are consumed; meanwhile, self-ignition risks of the coal gangue mountains are reduced.

Description

technical field [0001] The invention relates to the technical field of coal gangue hill covering and solid waste treatment, in particular to a sealing material and a construction method for coal gangue hill covering and disposal. Background technique [0002] Coal gangue is solid waste discharged during the coal mining process and coal washing process. It is a black-gray rock with low carbon content, sulfide content, and harder than coal that is associated with coal seams during the coal formation process. Including the excavation gangue during the roadway excavation, the gangue extracted from the roof, floor and interlayer during the mining process, and the gangue picked out during the coal washing process. Every time an average of 100 million tons of coal is produced in my country, about 14 million tons of gangue are discharged; from the perspective of coal washing and processing, the amount of gangue discharged for every 100 million tons of coking coal washed is 20 millio...

AI Technical Summary

Problems solved by technology

[0007] Invention patent CN201210136449 discloses a construction method for directly covering coal gangue hills with red mud to prevent spontaneous combustion (patent number: CN201210136449.1), but in the method disclosed in this patent, the red mud has not been treated, and its soluble alkali metal ions and other harmful Metal ions will be leached out with the washing of rainwater, causing pollution to the soil

Moreover, the covering material directly prepared from red mud has a low strength level and a short service life

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