Method for producing regenerated aggregate and regenerated cement from discarded concrete

Abstract

Disclosed is a method for producing regeneration skeletal materials and regeneration cement with abandoned concrete, which relates to a method for regeneration of the abandoned concrete. The invention resolves the recycling and utilizing problem of the abandoned concrete and the problem of producing secondary pollution in existing treatment process. The method of the invention comprises as follows that firstly, grinding and handling the abandoned concrete, secondly, calcining the abandoned concrete in the condition of 750-800 DEC G, thirdly, separating sandstone materials and grout from the lump materials of the abandoned concrete via mechanical workout, fourthly, obtaining stones, sands and regeneration skeletal materials after screen separation of the sandstone materials which are obtained by separation in the third step, fifthly, mixing the cement paste separated from the third step, silicate cement clinker and thickening time control agent to skive to obtain regenerate cement. The invention has the advantages of saving resource, protecting environment, saving energy, reducing costs, simple technology, and being not easy to make secondary pollution for environment.

Description

technical field [0001] The invention relates to a method for recycling waste concrete. Background technique [0002] Concrete is the most used structural material in the construction industry. In 2006, my country's cement output exceeded 1.2 billion tons, of which more than 40% was used to produce concrete, and the concrete output exceeded 4 billion cubic meters. The total amount of waste concrete demolished every year, waste concrete generated by engineering construction, and concrete discharged from concrete prefabricated component factories exceeds 40 million tons. The workload of cleaning and transportation is heavy, and the environmental pollution is serious. Concrete is composed of stones and sand in addition to cement. Abandoned concrete is treated as construction waste, and at the same time new resources such as minerals and clay are re-mined for the production of cement and sand and gravel materials, consuming a large amount of natural resources. The comprehensiv...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of recycling waste concrete and the problem of secondary pollution in the existing waste concrete treatment process; it provides a method for producing recycled aggregate and recycled cement from waste concrete