Fly ash washing cement kiln collaborative disposal and resource comprehensive utilization system and method

Abstract

The invention relates to a fly ash washing cement kiln collaborative disposal and resource comprehensive utilization system and method. The system includes: a fly ash rinsing and solid-liquid separation unit, a fly ash wet mud backmixing, drying and kiln entry unit, a fly ash washing liquid pretreatment unit and an MVR evaporative crystallization and potassium-sodium separation unit. The fly ash rinsing and solid-liquid separation unit is respectively connected to the fly ash wet mud backmixing, drying and kiln entry unit and the fly ash washing liquid pretreatment unit, and the fly ash washing liquid pretreatment unit is respectively connected to the MVR evaporative crystallization and potassium-sodium separation unit and the fly ash wet mud backmixing, drying and kiln entry unit. The system provided by the invention is a resource recycling and comprehensive utilization system, and completely has no discharge of wastewater and waste residue. The fly ash washing cement kiln collaborative disposal and resource comprehensive utilization method provided by the invention is simple, the system setting is reasonable, and by combining the technological characteristics of cement kiln, harmless, reduction and recycling disposal of waste incineration fly ash in large scale can be realized.

Description

technical field [0001] The invention belongs to the technical field of fly ash treatment, and in particular relates to a system and method for co-processing of fly ash washed with cement kiln and resource comprehensive utilization. Background technique [0002] Domestic waste incineration fly ash refers to the residue collected by the waste incineration power plant in the flue gas purification system. Its output is about 3-5% of the amount of incinerated waste. The waste incineration fly ash is also enriched with a large amount of heavy metals and dioxins. Among them, the leaching levels of various heavy metals such as Pb, Zn and Cd have reached the identification standard of hazardous waste, causing serious toxicity to the environment. Therefore, fly ash is listed as hazardous waste by countries around the world. By the end of 2020, the harmless disposal rate of domestic waste in municipalities directly under the central government, cities under separate state planning and ...

AI Technical Summary

Problems solved by technology

[0003] At present, the mainstream technology for disposing of fly ash is landfill after solidification and stabilization. The solidification and stabilization methods include chelating agent stabilization and cement solidification. The existing problems are: 1. The chelating agent itself is poisonous; Poor adaptability of ash; 2. Solidification increases capacity, increasing landfill land; 3. Poor long-term stability of solidified fly ash, high risk of re-release of toxic substances; 4. Land occupation; 5. Landfill is only temporary storage rather than disposal, polluting If the substance is not effectively digested and transformed, there is a great hidden danger

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