The characteristics of waste incineration ash

The solid residue after incineration of garbage generated roughly 30% -35% by weight of the garbage cement batch plant, bottom ash which accounted for 25% -30%, the rest is fly ash, accounting for about 5% [2].Fly ash after burning heat recycling system, flue gas purification system to collect the material.Fly ash production and waste type, burning conditions, incinerator and flue gas treatment process related.Less heavy metals in waste incineration bottom ash produced, especially volatile metals such as: Pb, Zn, Hg, Cd less content planetary concrete mixer supplier, mainly because some metals such as lithology pro: Ni, Cr, Cu, etc., are generally considered no poison can be used as raw material for reuse.Such as Denmark, the Netherlands waste incineration bottom ash more than 90% of used car parks, dams, embankment fill material such as asphalt and concrete and aggregates, Germany and France, respectively, 60% and 45% of incineration bottom ash used as roadbed and municipal engineering [3] materials.Analysis showed that: waste incineration ash is not chemically inert substance, which can contain flooding out of Cd, Pb, Zn mobile batch plant, Cr and other harmful heavy metals and salts.If direct incineration ash landfill or mishandled, in the natural environment due to the effect of acid rain and other factors, the acidic environment will gradually leaching out heavy metals, re-enter the environment, polluting groundwater and crimes against humanity [4].Meanwhile, the fly ash dioxin is also potentially important environmental pollutants. Since waste incineration fly ash and other heavy metals and dioxins difficult natural degradation, so its impact on the environment very seriously.
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Results Characteristics of heavy metals in fly ash and abroad show: Heavy metals having a high boiling condensation easily even in the combustion process, thereby forming the core of the fly ash, and volatile heavy metals at high temperature will decrease as the temperature of condensation in the fly ash surface, heavy metals in fly ash with fly ash particle size decreases and increases. Leaching of toxic heavy metals in fly ash and fly ash particle size, surface area, pH value, primarily dependent on the presence of heavy metals in fly ash morphology [5].Table 1 lists the hazardous waste leaching toxic identification standard.