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Additive for reducing moisture content of fly ash filter cakes generated from waste incineration

A waste incineration fly ash and additive technology, applied in the direction of filtration separation, separation methods, chemical instruments and methods, etc., can solve the problems of cement raw material crusting, high chloride ion content, blockage, etc., to facilitate transportation and storage, and save costs Effect

Active Publication Date: 2013-01-16
BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chlorine ion content in the garbage fly ash is high, if it is directly used as a cement raw material, it will cause skinning and blockage, which will affect the normal operation of the cement kiln

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] The additive for reducing the water content of waste incineration fly ash filter cake of the present invention is composed of diatomite, polycarboxylate water reducer and carbonate, and is formulated by the following weight (%):

[0025] Diatomaceous earth 70;

[0026] Polycarboxylate water reducer (concentration is 50%) 10;

[0027] Sodium Carbonate 20.

[0028] After the ratio of raw materials is selected, the process is as follows:

[0029] Pre-mixing: Add 70% diatomaceous earth to the mortar mixer and stir for 3 minutes at a low speed. During the stirring process, spray 10% polycarboxylate superplasticizer with a concentration of 50% with a watering can. After spraying, continue stirring Discharge after 30 minutes;

[0030] Drying: heat the above mixture in an oven at 110 degrees for 24 hours to make it fully dry;

[0031] Mixing: Mix the above dried mixture with 20% sodium carbonate in a mortar mixer for 15 minutes.

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Abstract

The invention relates to an additive for reducing the moisture content of fly ash filter cakes generated from waste incineration, which comprises the components of kieselguhr, polycarboxylic acid water reducing agent and phosphate or carbonate substances and is prepared through processes of premixing, drying and mixing. The product is a powdery product, is convenient to transport and store and can be added together with fly ash during fly ash washing, and the original washing process does not require changing. After the additive accounting for 3-5% of waste fly ash by weight is used in the fly ash washing process, the moisture content of waste fly ash filter cakes is obviously reduced from 40-42% to 23-25%; after the additive is used in the fly ash washing process, the consumption of ash washing water can be reduced to be lower than 3 times. The cost of wet ash drying and sewage treatment is greatly saved.

Description

Technical field [0001] The invention relates to the technical field of washing process of waste incineration fly ash, in particular to an additive for reducing the water content of waste incineration fly ash filter cake. Background technique [0002] Disposal of domestic waste is an environmental problem plaguing many densely populated metropolises. In recent years, the disposal technology of incinerating domestic waste to generate electricity has been increasingly recognized. Domestic waste incineration power plants have been built in Shenzhen, Shanghai, Tianjin and Beijing. [0003] Domestic waste incineration fly ash is the dust with small particle size collected by the dust collector of the domestic waste incineration power plant, referred to as garbage fly ash. Garbage fly ash contains heavy metals and dioxins. It is a kind of hazardous waste. In the past, it could only be buried in hazardous waste landfills, occupying land resources and costing a lot of landfill. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D37/02
Inventor 顾军
Owner BEIJING BUILDING MATERIALS ACADEMY OF SCI RES