Washing desalination system and method for waste incineration fly ash or kiln dust

Abstract

The invention relates to a washing desalination system and method for waste incineration fly ash or kiln dust. The invention aims at providing the washing desalination system and method with multiplegrading manners, good desalination effect and low cost. The washing desalination system comprises a conveying system and multiple stages of elution systems, wherein the elution systems include a first-stage elution system, a second-stage elution system and a multi-stage elution system; the content of chlorine salt in to-be-processed fly ash or kiln dust is more than or equal to 4% and less than orequal to 10%, and the first-stage elution system is adopted when the chlorine content is more than or equal to 2% and less than or equal to 5%; the content of chlorine salt in to-be-processed fly ashor kiln dust is more than or equal to 10% and less than or equal to 20%, and the first-stage elution system and the second-stage elution system are sequentially adopted when the chlorine content is more than or equal to 5% and less than or equal to 10%; and the content of chlorine salt in to-be-processed fly ash or kiln dust is more than or equal to 20%, and the first-stage elution system, the second-stage elution system and the multi-stage elution system are sequentially adopted when the chlorine content is more than or equal to 10%.

Description

technical field [0001] The invention relates to the field of waste incineration fly ash or kiln ash treatment, in particular to the field of cement manufacturing, in particular to a water washing and desalination system and method for waste incineration fly ash or kiln ash. Background technique [0002] With the continuous promotion of domestic waste incineration treatment methods, the amount of waste incineration fly ash is also increasing. Generally, the incoming garbage of municipal waste incineration power plants contains a large amount of kitchen waste and plastic product waste. These two kinds of garbage are the main components of domestic waste. Garbage will produce waste incineration fly ash with chlorine content greater than or equal to 2%. At the same time, with the country's rapid economic construction and development, various kilns have sprung up on the land of the motherland. These kilns will produce different amounts of kiln dust during the incineration or cal...

AI Technical Summary

Problems solved by technology

[0006] 1. In the domestic pretreatment process of waste incineration fly ash or kiln ash, quantitative water is used for ash washing, resulting in a large amount of waste of water resources;

[0007] 2. The pretreatment equipment for waste incineration fly ash or kiln dust adopts an open design, which causes the water vapor generated during the washing process of waste incineration fly ash or kiln dust to diffuse into the processing plant, polluting the plant and also Bring a lot of inconvenience to operators and maintenance personnel;

[0008] 3. In the pretreatment technology of waste incineration fly ash or kiln ash, the desalination treatment of fly ash containing different chloride salts is carried out in a single fixed mode, and the cost is relatively high;

[0009] 4. In the pretreatment system of waste incineration fly ash or kiln ash, the system has been cleaned manually, which has caused a lot of unnecessary workload and wasted a lot of manpower and material resources

[0010] 5. In the pretreatment process of waste incineration fly ash or kiln ash, the addition of flocculant in the solid-liquid separation process has always been in excess, which increases the cost of a large amount of chemicals in the whole process

[0011] Aiming at the problems of excessive water consumption, poor desalination effect, and high cost in the desalination process of waste incineration fly ash or kiln ash in related technologies, no effective solution has been proposed so far

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