Washing softening technology for MSWI (Municipal Solid Waste Incineration) fly ash

A technology of waste incineration fly ash and process, applied in the field of waste incineration fly ash treatment, can solve the problems of unstable effluent, high chloride ion content in mud cake, affecting effluent quantity, etc., achieving good water treatment effect, stable effluent quality, Guarantee the effect of cement quality

Active Publication Date: 2015-07-29
BEIJING ZKGR ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The mud cake from the water treatment centrifuge directly enters the drying system. Since this part of the sludge comes directly from the final washing liquid, the content of chloride ions in the mud cake is high, which affects the quality of cement;
[0006] 2. The water treatment centrifuge accepts two parts of sludge, coarse adjustment and fine adjustment. Once the amount of sludge in both parts is relatively large, it is difficult to control, resulting in part of the sludge silting, and then blocking the pipeline;
[0007] 3. The sewage after coarse adjustment is directly discharged into the clear water tank. Once the sludge volume is large and the sedimentation effect is not good, it will directly lead to excessive sludge volume in the evaporation system, causing a series of production failures, unstable water output, and seriously affecting the output. amount of water

Method used

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  • Washing softening technology for MSWI (Municipal Solid Waste Incineration) fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A process for washing and softening waste incineration fly ash, comprising the following steps:

[0037] (1) Pass water into the fly ash, stir it, and then carry out a water wash. After the water wash is completed, pass it into the primary centrifuge A for a centrifugal dehydration. Add the PAM solution to the separated filtrate and mix it evenly, then pass it into The primary centrifuge B performs secondary centrifugal dehydration;

[0038] (2) Wash the filter cake separated by the primary centrifuge A and B for the second time, then pass it into the secondary centrifuge A for centrifugal dehydration, add the PAM solution to the separated filtrate and mix well, then pass it into the secondary centrifuge A and carry out centrifugal dehydration. Stage centrifuge B for secondary centrifugal dehydration;

[0039] (3) Add lye, such as saturated sodium carbonate solution, to the filtrate separated from the first-stage centrifuge B, and perform the first rough adjustment of ...

Embodiment 2

[0044] Such as figure 1 Shown, a kind of waste incineration fly ash washing softening process comprises the following steps:

[0045] (1) Put the fly ash into the pre-mixing tank, and feed water at the same time, the water-cement ratio is 3:1, and stir, and then pass into the first-level washing tank for a water wash, after the washing is completed, enter the first-level centrifuge A for Centrifugal dehydration, the separated filter cake enters the secondary water washing tank, adds PAM solution to the filtrate and mixes evenly, the dosing ratio is 0.1Kg / ton of dry fly ash, the concentration of PAM solution is 1.5g / L, and then passes into the primary Centrifuge B performs secondary centrifugal dehydration, the separated filter cake enters the secondary washing tank, and the filtrate enters the first intermediate pool;

[0046](2) The filter cakes separated by the primary centrifuges A and B are washed twice in the secondary washing tank, and then enter the secondary centrifug...

Embodiment 3

[0057] Such as figure 1 Shown, a kind of waste incineration fly ash washing softening process comprises the following steps:

[0058] (1) Put the fly ash into the pre-mixing tank, and at the same time pass into the water, the water-cement ratio is 4:1, and stir, and then pass into the primary washing tank for a water washing, after the washing is completed, enter the primary centrifuge A for Centrifugal dehydration, the separated filter cake enters the secondary washing tank, add PAM solution to the filtrate and mix evenly, the dosing ratio is 0.2Kg / ton of dry fly ash, the concentration of PAM solution is 1g / L, and then pass into the primary centrifuge Machine B performs secondary centrifugal dehydration, the separated filter cake enters the secondary washing tank, and the filtrate enters the first intermediate pool;

[0059] (2) The filter cakes separated by the primary centrifuges A and B are washed twice in the secondary washing tank, and then enter the secondary centrifug...

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Abstract

The invention discloses a washing softening technology for MSWI (Municipal Solid Waste Incineration) fly ash. The technology comprises the following steps of performing primary washing on the fly ash; performing primary centrifugal dewatering on the washed fly ash after the washing operation is completed; adding a PAM (Polyacrylamide) solution into the separated filter liquor and uniformly blending; feeding the mixture into a first-level centrifugal machine B for performing secondary centrifugal dewatering; feeding the filter liquor separated from the first-level centrifugal machine B into a decalcified centrifugal machine for centrifuging after the filter liquor is subjected to hardness coarse-adjustment and heavy metal removal treatment; finely adjusting the hardness of the filter liquor separated from the decalcified centrifugal machine, sequentially precipitating and filtering the filter liquor, and adjusting the PH value of the filter liquor to be 7-8; finally feeding the filter liquor to an MVR (Mechanical vapor recompression) evaporator. According to the washing softening technology for the MSWI (Municipal Solid Waste Incineration) fly ash, the washing treatment effect is good, and the effluent quality is stable; a filter cake separated from the decalcified centrifugal machine is mixed with the filter liquor discharged by a second-level centrifugal machine A, and then the mixture is subjected to subsequent treatment, so that the mixture can be washed twice again, therefore the content of chloride ions in the filter cake is smaller than 0.5%, and the problem of high chlorine content in the filter cake is solved, and the cement quality is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of waste incineration fly ash treatment, in particular to a water washing and softening process of waste incineration fly ash. Background technique [0002] Using cement kilns to co-process waste incineration fly ash project is to reuse the fly ash collected after municipal solid waste incineration. The main process is to wash the collected fly ash, and then burn the remaining fly ash to cement. After the wastewater generated by water washing is collected, treated, and meets the requirements for reuse, it can be reused for fly ash washing. [0003] The reason why the fly ash must be washed with water is because the fly ash contains a large amount of Cl - , if it is not removed, it will affect the quality of cement, that is, only the cl - Only when it is removed can it be disposed of in a cement kiln. At present, the way to remove high-concentration chloride ions is mainly to wash the fly ash with water, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F1/003C02F1/04C02F1/38C02F1/52C02F1/56C02F9/00C02F11/00C02F2101/12C02F2103/18C02F2301/08
Inventor 李忠锋
Owner BEIJING ZKGR ENVIRONMENTAL PROTECTION TECH CO LTD
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