A method for solid-liquid separation of waste incineration fly ash with water washing slurry
A technology for waste incineration fly ash and solid-liquid separation, which is used in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. , can not run continuously and stably, to achieve the effect of low moisture content of mud cake, ideal separation effect and remarkable removal effect
Active Publication Date: 2018-12-11
BEIJING BUILDING MATERIALS ACADEMY OF SCI RES +1
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Problems solved by technology
[0004] At present, the solid-liquid separation method of waste incineration fly ash washing slurry is mainly to use vacuum filter for suction filtration. However, due to the high CaO content, small particle size, large specific surface area and good hydrophilicity of waste incineration fly ash, the vacuum During the suction filtration process of the filter, the filter cloth is clogged and corroded, the solid-liquid separation effect is poor, and the continuous and stable operation is not possible, resulting in a high moisture content of the mud cake after separation, and a poor effect of removing chloride ions in the fly ash. low ability
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Embodiment Construction
[0014] The technical solution of the present invention will be described in further detail below.
[0015] A solid-liquid separation method for washing slurry of waste incineration fly ash, using two-stage series decanter centrifuges and adding flocculant for solid-liquid separation, the operation steps include:
[0016] 1) First, use the feed pump to pump the uniformly stirred waste incineration fly ash water washing slurry to the first-stage decanter centrifuge for solid-liquid separation. Most of the insoluble matter is separated to form a mud cake for subsequent processing, and the remaining insoluble matter is mixed with The water forms a primary filtrate and enters the filtrate tank.
[0017] In order to ensure that this step 1) the first-stage decanter centrifuge has better working performance and higher separation efficiency, the weight content of insolubles in the slurry of garbage incineration fly ash washing is controlled to be ≤30%, and the separation of the first-...
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Abstract
The present invention provides a solid-liquid separation method for a waste incineration fly ash washing slurry. The method uses two stages of cascade horizontal screw centrifuges and the way of flocculant addition for solid-liquid separation. The steps include: 1) a first pumping the waste incineration fly ash washing slurry to a first stage of horizontal screw centrifuge by a charge pump for solid-liquid separation, separating out most of the insolubles to form a first mud cake for posttreatment, and forming the remaining insolubles with water into a first filtrate and sending the first filtrate into a filtrate tank; and 2) then pumping the first filtrate feed in the filtrate tank to a second stage of horizontal screw centrifuge by the charge pump, adding the flocculant in a feed pipe, the subjecting the first filtrate to solid-liquid separation, merging the second mud cake with the first cake obtained in the step 1), and sending the secondary filtrate into a clear water tank. Compared with a vacuum filter, the invention has the advantages of complete separation, low moisture content of mud cake, significant removal effect of chloride ion in fly ash and large disposal ability.
Description
technical field [0001] The invention relates to the technical field of washing process of waste incineration fly ash, in particular to a solid-liquid separation method for washing slurry of waste incineration fly ash. technical background [0002] Domestic waste incineration has the characteristics of fast processing speed, small footprint, significant reduction and harmless effects, and has become one of the main disposal methods for urban domestic waste in recent years. Waste incineration fly ash is a secondary pollutant produced in the process of waste incineration. The output is generally about 3-5% of the total waste incineration. It is enriched in a large amount of heavy metals and dioxin-like organic pollutants, which is harmful to the environment. It needs to be managed and disposed of as hazardous waste. In the past, it could only be buried in hazardous waste landfills, occupying land resources and costing a lot of landfill. [0003] It is an advanced new technolog...
Claims
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IPC IPC(8): C02F9/04
Inventor 顾军朱延臣张国亮芦澍王树练礼财周治平蔡文涛殷杰黄岚
Owner BEIJING BUILDING MATERIALS ACADEMY OF SCI RES