Method for producing cement-based composite material for injection reinforcement from waste incineration fly ash

Abstract

The invention relates to a method for producing a cement-based composite material for injection reinforcement from waste incineration fly ash. The method specifically comprises steps as follows: MgCO3 is decomposed at the high temperature of 1000-1300 DEG C, and MgO with the specific surface area ranging from 1800 cm<2>/g to 3010 cm<2>/g is prepared; the surface of the MgO is pretreated, the pretreated MgO is mixed with phosphate, the waste incineration fly ash, metakaolin and a retarder in proportion, and the magnesium phosphate cement-based composite material is prepared; the composite material comprises, in percentage by mass, 10-30% of the pretreated MgO, 15-40% of the phosphate, 10-40% of the waste incineration fly ash, 15-40% of the metakaolin and 2-8% of the retarder; the total mass is 100%. With the adoption of the method, the excellent product performance is obtained, meanwhile, the temperature required for calcination of the MgO is decreased, toxic and harmful solid waste such as the waste incineration fly ash and the like can be disposed and utilized scientifically and efficiently, the waste has high added value, and the method has positive significance in developing low-carbon economy and building resource-saving and environment-friendly society.

Description

Technical field [0001] The invention belongs to the field of new material technology and environmental protection technology, and specifically relates to a method for spraying and strengthening cement-based composite materials using garbage incineration fly ash. Background technique [0002] With the rapid development of my country's economic and social construction and the gradual expansion of the scale of urbanization, the output of urban waste is also increasing year by year. Simple stacking of urban garbage not only wastes valuable land resources, but also poses a serious threat to the ecological environment and human health. Therefore, the ability of the harmless treatment of municipal solid waste has directly restricted the sustainable development of our society, economy and ecological environment. At this stage, the harmless treatment of domestic garbage in my country is mainly based on landfill, and composting and incineration are supplemented. With the significant adva...

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Problems solved by technology

[0013] ③Retarding materials include borax, boric acid, sodium tripolyphosphate and alkali metal salts, etc. The main function is to form a protective film on the surface of MgO in the acidic phosphate solution, thereby preventing the reaction from proceeding and effectively delaying the setting time of magnesium phosphate cement. Of course, the retarder content also needs to be controlled within a certain range, too much will cause the strength of magnesium phosphate cement to decrease

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