Method for preparing concrete from waste denitration catalyst and coal ash through combined admixture and concrete

Abstract

The invention relates to a method for preparing concrete from a waste denitration catalyst and coal ash through combined admixture and concrete. The method comprises the following steps: stirring a vanadium-titanium series waste denitration catalyst, coal ash, cement and dinas with water and a water reduction agent, performing hydration reaction, and performing curing molding, thereby obtaining the concrete. The concrete is made by using the method. By adopting the method, a superimposed effect is brought into play, the anti-permeability and the collapsbillity of the concrete are improved, the compressive strength meets requirements on strength of C30 concrete, and the amount of the water reduction agent is reduced; the anti-permeability of the concrete is superior to that of concrete without the coal ash or the waste denitration catalyst; due to the hydration reaction in admixture preparation, functions of curing and stabilizing heavy metal elements in the waste denitration catalyst are achieved, leaching of the heavy metal elements is effectively reduced, and thus secondary environment pollution is reduced; the total mass of substituted cement can be up to 20%, the working performance of the concrete is improved, the production cost of the concrete is lowered, resource utilization of wastes is achieved, and prepared commercial concrete has wide application prospects.

Description

technical field [0001] The invention relates to the field of concrete materials, in particular to a concrete prepared by compounding waste flue gas denitrification catalyst and fly ash. Background technique [0002] The National Environmental Office Letter [2014] No. 990 "Notice on Strengthening the Supervision of Waste Flue Gas Denitrification Catalysts" officially included waste flue gas denitrification catalysts (vanadium-titanium series) into hazardous waste for management, requiring that the waste flue gas denitrification catalyst ( Vanadium-titanium series) regeneration, utilization and disposal capabilities. At present, the regeneration technology of domestic waste catalysts is becoming more and more mature, and has formed a certain industrial scale. For waste catalysts that do not have regeneration value, they are generally handed over to downstream units with hazardous waste disposal qualifications for landfill or extraction and recycling. Methods. The landfill di...

AI Technical Summary

Problems solved by technology

The landfill disposal method has certain hidden safety hazards and occupies land, so it has no prospect of comprehensive utilization; the extraction and recovery method has complex processes, high processing costs, and easy to produce secondary pollution during the processing process, which is not conducive to environmental protection and the improvement of comprehensive benefits