Garbage burning fly ash sintering harm-eliminating resource-utilization treatment system

Abstract

The invention relates to a garbage burning fly ash sintering harm-eliminating resource-utilization treatment technology. According to the invention, garbage burning fly ash is mixed with premixed coal and auxiliary materials; the mixture is granulated and shaped; and the material is dried and is sintered in a rotary kiln. During the sintering process, when the temperature is increased and a coal ignition point is reached, the premixed coal is spontaneously combusted. Therefore, external coal dose can be reduced. Initial combustion of the premixed coal can provide a reductive atmosphere, such that dechlorination and detoxification of dioxin in fly ash can be benefited. Large amount of gas is produced by subsequent combustion, such that dust pores and holes are produced on inner and outer parts of the sintered body, and heavy metal volatilization can be promoted, and fly ash sintered body with low heavy metal content and leaching amount can be obtained. The sintered body has no potential harm to the environment, such that fly ash harm-eliminating and resource-utilization are sufficiently realized. During the processing process, smoke and secondary fly ash production amounts are low, and heavy metal and acidic component contents are high. In deacidification and heavy metal stabilization processes, agent utilization rate is improved. Compared with a traditional original fly ash curing/stabilizing process, a landfill amount can be reduced by 80-90%, such that pressure caused by serious landfill space shortage can be effectively relieved.

Description

technical field [0001] The invention relates to a harmless treatment method for waste incineration fly ash, in particular to a method for treating waste incineration fly ash by adopting sintering technology. Background technique [0002] Waste incineration fly ash is regulated as hazardous waste due to its high content of heavy metals, high leaching toxicity, and high toxic equivalent of dioxin-like compounds, requiring special treatment. High-temperature processing methods such as sintering and melting can effectively control pollution and realize resource utilization. Compared with melting processing technology, sintering technology has low energy consumption and relatively simple operation and maintenance. [0003] At present, the principle of fly ash sintering technology at home and abroad is mostly to solidify heavy metals in the dense lattice structure of sintered products, so as to reduce the possibility of heavy metal dissolution and achieve the purpose of controllin...

AI Technical Summary

Problems solved by technology

[0004] The fly ash processed by the above method is mostly used as building materials after being "resourced". This kind of building materials still contains a large amount of heavy metals from fly ash. If these sintered bodies are exposed to the environment for a long time, they will be eroded or Once fragmentation occurs, the release of heavy metals to the environment will increase greatly, which will easily cause serious secondary harm to the environment and human health.

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