Refuse burning fly ash solidification agent and solidification method of refuse burning fly ash

Abstract

The invention discloses a refuse burning fly ash solidification agent comprising the following components in percentage by weight: 35%-60% of slag micropowder, 35%-50% of sodium silicate and 5%-20% of sodium fluosilicate. The invention also discloses a solidification method of refuse burning fly ash, comprising the following steps of: weighing the solidification agent in a formula proportion; mixing and solidifying with the refuse burning fly ash to obtain a refuse burning fly ash solidification body; grinding the refuse burning fly ash solidification body into powder; weighing 10%-100% of refuse burning fly ash solidification body powder in the terms of the mass percent of bituminous mixture fillers, and adding to a bituminous mixture to equivalently substitute limestone powder in the bituminous mixture so that the refuse burning fly ash is secondarily solidified in the bituminous mixture. The invention has the advantages of reducing the leaching toxicity of heavy metals contained in the refuse burning fly ash so that the heavy metals have long-time stability, thereby effectively preventing the secondary pollution of an environment.

Description

technical field [0001] The invention relates to a solidifying agent for waste incineration fly ash and a consolidation method for waste incineration fly ash. Background technique [0002] Waste incineration treatment is one of the main methods to solve urban domestic waste. The fly ash produced by incineration is rich in heavy metals such as Pb, Cr, Cd, Cu, Zn, Hg that are easy to leach, and also contains highly toxic organic substances such as dioxin, which is dangerous. waste. If it is not treated in a timely and effective manner, it will have a great impact on the environment, cause water and soil pollution, and seriously endanger human health. [0003] At present, the methods developed at home and abroad for the harmless and stable treatment of incineration fly ash mainly include safe landfill method, solidification stabilization and wet chemical treatment method. Common methods of curing include fusion techniques, cement curing, chemical stabilization, and asphalt cur...

AI Technical Summary

Problems solved by technology

Melting and solidification needs to heat a large amount of materials above the melting point. Whether electricity or other fuels are used, the energy and cost required are quite high. The volume of the solidified body increases greatly, which brings difficulties to the final landfill of fly ash, and the percolation of heavy metals is difficult to avoid after a long time, resulting in secondary pollution to the environment; some chemicals can effectively stabilize fly ash when treating hazardous waste Heavy metals in some, but some have little effect; simple asphalt curing cannot guarantee the long-term stability of heavy metals

Fly ash wet chemical treatment methods include acid extraction and flue gas neutralization carbonation, etc. This process has low operating costs and can recover heavy metals and salts, but it also has the disadvantage of requiring treatment of soluble salts and wastewater , generally only used when the concentration of heavy metals is high and recovery is necessary, so it is rarely used at present