High-strength coal gangue ceramsite and preparation method thereof

Abstract

The invention discloses a high-strength coal gangue ceramsite and a preparation method thereof, and relates to a building material and a preparation method thereof. The high-strength coal gangue ceramsite comprises the following raw materials by weight: 90%-97% of coal gangue, 2%-8% of carbide slag, and 0%-10% of papermaking white mud, wherein the coal gangue is uncalcined coal gangue or calcinedcoal gangue or a mixture of the uncalcined coal gangue and the calcined coal gangue, the carbide slag is solid waste discarded after chemical industry products are prepared from acetylene, and the papermaking white mud is solid waste abandoned in a papermaking process. According to the invention, coal gangue, carbide slag and papermaking white mud in ceramsite manufacturing raw materials are all solid waste, and the mixing amount of the coal gangue in the raw materials is higher than 90%, so that the problems that the coal gangue pollutes the earth surface and the atmosphere and wastes land are effectively solved, and resource utilization of the waste can be effectively achieved; and the ceramsite prepared by the method is simple in formula, low in stacking density, high in cylinder compressive strength, simple in formula and low in raw material cost, and the technological process is adopted.

Description

technical field [0001] The invention belongs to building materials and a preparation method thereof, in particular to a high-strength coal gangue ceramsite and a preparation method thereof. Background technique [0002] Coal gangue is solid waste discharged during coal mining and coal washing. It is a black-gray rock with low carbon 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, the main components of which are Al2O3 and SiO2. Coal gangue is discarded, occupying a large area of ​​land. The extraction or leaching of sulfides in coal gangue will pollute the atmosphere, farmland and water bodies. Gangue hills can also spontaneously ignite and cause fires, or collapse during the rainy season, silting up rivers and causing d...

AI Technical Summary

Problems solved by technology

[0005] Chinese patent CN201310440491.7 discloses a "preparation of a high-strength coal gangue ceramsite", wherein coal gangue powder (coal slime and natural coal gangue): 70-90%, fly ash: 6-22%. Foaming agent (sodium carbonate): 3-7%, auxiliary agent (manganese dioxide): 0.5-1% to prepare ceramsite, although the performance is excellent, the foaming agent and auxiliary agent are all made of chemical raw materials, and coal gangue is also mixed Coal slime, the cost is too high, coal gangue also uses spontaneous combustion coal gangue, and the utilization of coal gangue is also limited

[0006] Chinese patent CN201310508355.7 discloses a "method for preparing ceramsite by sintering barren coal gangue industrial waste residue as raw material", wherein barren coal gangue: phyllite = (1 ~ 2.5): 1 mixed, stirred After uniformity, pulverize to a particle size of less than 1mm to form a mixture A, and then add 5-10% water glass to the mixture A to obtain ceramsite. Only 1000°C is required, but the disadvantage is that the phyllite used is a restricted mining raw material, and the cost of water glass in the formula is a chemical raw material that is too high, which is not conducive to commercial production. According to the method for preparing ceramsite described in the patent, only stay It is not used in industrial production in laboratory electric furnace