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Flotation separation method for household garbage incineration fly ash

A technology of domestic waste incineration and separation method is applied in the field of flotation separation of domestic waste incineration fly ash to achieve the effects of low cost, promotion of flotation separation, and improvement of flotation efficiency

Pending Publication Date: 2022-07-15
深圳市小荷环保技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is to overcome the deficiencies in the above-mentioned prior art and provide a method for flotation and separation of domestic waste incineration fly ash, which overcomes the difficulty of reducing the dioxin content to below 50ng-TEQ / kg in traditional flotation methods The problem

Method used

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  • Flotation separation method for household garbage incineration fly ash
  • Flotation separation method for household garbage incineration fly ash

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Effect test

Embodiment 1

[0030] like figure 1 As shown, a flotation separation method of domestic waste incineration fly ash, the treated fly ash is domestic waste incineration fly ash from a waste incineration power plant in Guangdong, the soluble chlorine content in the fly ash is 16.83%, the activated carbon content is 2.50%, dioxin The British content is 350ng-TEQ / kg, and the process steps are:

[0031] (1) Washing of fly ash: 0.50t of waste incineration fly ash with a salt content of 40% is washed with four-stage water to obtain 0.48t of washed ash with a moisture content of 38% and a brine with a concentration of 18%. The mass ratio of fly ash and washing water in each level of fly ash washing is 1:2. The desalination rate of the first-level washing can reach 92%, and the desalination rate of the second-level washing is increased to 95%. After the third-level washing The chloride ion content is reduced to 1% to 2%, and the soluble chloride ion content is reduced to 0.45% after the fourth stage ...

Embodiment 2

[0039] like figure 1 As shown in the figure, a flotation separation method of domestic waste incineration fly ash, the treated fly ash is domestic waste incineration fly ash from a waste incineration power plant in Guangdong, the soluble chlorine content in the fly ash is 18.83%, the activated carbon content is 1.84%, the dioxin The British content is 430ng-TEQ / kg, and the process steps are:

[0040] (1) Washing of fly ash: 0.50t of waste incineration fly ash with a salt content of 40% is washed with four-stage water to obtain 0.49t of washed ash with a moisture content of 38.50% and a brine with a concentration of 18.89%. The mass ratio of fly ash and washing water in each level of fly ash washing is 1:2. The desalination rate of the first-level washing can reach 92.25%, and the salt-removing rate of the second-level washing increases to 95.79%. After the third-level washing The chloride ion content is reduced to 1% to 2%, and the soluble chloride ion content is reduced to 0...

Embodiment 3

[0048] like figure 1 As shown, a flotation separation method of domestic waste incineration fly ash, the treated fly ash is domestic waste incineration fly ash from a waste incineration power plant in Guangdong, the soluble chlorine content in the fly ash is 19.05%, the activated carbon content is 2.55%, dioxin The British content is 510ng-TEQ / kg, and the process steps are:

[0049] (1) Washing of fly ash: 0.50t of waste incineration fly ash with a salt content of 40% is washed with four-stage water to obtain a water-washed ash with a moisture content of 38.50% and a brine with a concentration of 0.49t and 18.89%. The mass ratio of fly ash and washing water in each level of fly ash washing is 1:2. The desalination rate of the first-level washing can reach 92.25%, and the salt-removing rate of the second-level washing increases to 95.79%. After the third-level washing The chloride ion content is reduced to 1% to 2%, and the soluble chloride ion content is reduced to 0.33% afte...

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Abstract

The invention relates to a flotation separation method for household garbage incineration fly ash. The flotation separation method comprises the following steps: (1) performing four-stage washing on the garbage incineration fly ash to obtain washed ash and salt-containing water; (2) preparing the washed ash and water into slurry according to the mass ratio of (1: 2)-(2: 1), uniformly stirring at a certain rotating speed, and adding an activating agent; (3) pumping the slurry into a continuous ball mill through a slurry pump at a constant flow rate for ball milling; (4) diluting the ball-milled slurry with water until the concentration is 10-25%; (5) the diluted slurry sequentially flows into a stirring barrel added with a collecting agent and a stirring barrel added with a foaming agent; (6) the slurry added with the reagent enters a flotation tank through overflow for flotation, and flotation foam and flotation tail slurry are obtained after roughing, two-stage concentration and three-stage scavenging; and (7) carrying out plate and frame filtration on the flotation froth and the flotation tail slurry to obtain dioxin-enriched carbon concentrate and dioxin-removed treatment ash. The separation method disclosed by the invention is low in cost and good in treatment effect, can effectively reduce the content of dioxin in the fly ash, and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a flotation separation method of domestic waste incineration fly ash. Background technique [0002] Domestic waste incineration fly ash contains highly toxic organic pollutants such as water-soluble chloride salts, heavy metals and dioxins, and belongs to hazardous waste. The current disposal method is mainly landfill. my country produces a large amount of fly ash, with an annual output of about 10 million tons. Land resources in large and medium-sized cities are increasingly tight, and landfill-based disposal methods are facing increasing pressure. Fly ash is recycled, reduced, and harmless. Chemical processing is the ultimate trend. Article 6.3 of the Technical Specification for the Control of Fly Ash Pollution from Domestic Waste Incineration (Trial) (HJ 1134-2020) stipulates that it can be used for other utilization methods other than the raw materials of cem...

Claims

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Application Information

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IPC IPC(8): B03D1/018B03D1/02B03D1/14B03D101/02B03D101/04B03D101/00
CPCB03D1/018B03D1/02B03D1/1456B03D1/14B03D2201/04B03D2201/02B03D2201/00
Inventor 谢巧玲王丹丹
Owner 深圳市小荷环保技术有限公司
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