Household garbage incineration fly ash reduction recycling treatment method

A technology of domestic waste incineration and treatment method, applied in the field of domestic waste incineration fly ash reduction and recycling, can solve problems such as affecting the operation efficiency of cement kilns, reducing cement quality, flue gas pollution, etc., to achieve harmless treatment, The effect of reducing emissions and reducing environmental risks

Inactive Publication Date: 2021-02-23
杭州灰弘环保科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Fly ash needs to be pretreated when it is applied in a large amount of cement and concrete, otherwise the chlorine in the fly ash will affect the operating efficiency of the cement kiln, reduce the quality of the cement, and also affect the strength of the concrete
Fly ash i

Method used

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  • Household garbage incineration fly ash reduction recycling treatment method
  • Household garbage incineration fly ash reduction recycling treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Such asfigure 1 As shown, a recycling method for reducing the amount of fly ash from domestic waste incineration, the specific steps are as follows:

[0034]Step 1. Add the fly ash, hydrochloric acid and hydrogen peroxide solution to the pickling tank and stir and mix to produce pickling slurry; considering the leaching efficiency and acid consumption, adjust the pH of the solution to 2.5; the liquid-solid of the pickling slurry The ratio is 2:1. The duration of the stirring reaction is 45 minutes, and most of the chlorine and heavy metal ions in the fly ash are leached out; the mass fraction of hydrochloric acid is 5%, and the mass fraction of hydrogen peroxide in the hydrogen peroxide solution is 35%; Hydrogen oxide optimizes the acid leaching process; adding the oxidizing agent hydrogen peroxide during the stirring process of the pickling slurry can maintain the oxidation conditions during the entire leaching period, keeping the oxidation-reduction potential constant at greate...

Embodiment 2

[0050]The difference from the first embodiment is that the use of citric acid to replace the hydrochloric acid + hydrogen peroxide; the solution pH is adjusted to 3: 1. The metal chelate is formed by forming a metal chelate with a metal cation in a solution to form a metal ion, thereby increasing the leaching reaction.

[0051]Through the method described in this example, the initial conditions are: chlorine (CL) content is 16.32%, copper (Cu) content is 0.985 mg / g, and zinc (Zn) content is 5.783 mg / g, cadmium (CD) content is 0.186 mg / g, lead (PB) content is a flying ash of 2.887 mg / g for resource treatment test, and the decochlorination ratio of fly ash reaches 96% to 98%, and the leaching rate of copper (Cu) reaches 98% ± 2%. The leaching rate of zinc (Zn) reached 80% ± 1%, cadmium (CD) leaching rate reached 97% ± 2%, lead (Pb) leaching rate reached 84% ± 1%; through step six in SRE + electrolysis The total recovery rate of Cu reaches 90%, and the total recovery rate of Zn re...

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Abstract

The invention discloses a household garbage incineration fly ash reduction recycling treatment method. Garbage incineration fly ash serves as hazardous waste, but heavy metal in the garbage incineration fly ash has the huge potential and value of recycling. The method comprises the following steps that 1, fly ash, acid and an oxidizing agent are jointly added into a pickling tank to be stirred andmixed, and pickling slurry is generated; 2, the pickling slurry is subjected to solid-liquid separation, and pickling liquid and pickling waste residues are obtained; and 3, after the pickling wasteresidues are washed, ash residues capable of being recycled are obtained. According to the method, the acid leaching technology is optimized in the manner of adding the oxidizing agent; and the oxidizing agent is added, the oxidizing condition can be maintained in the whole leaching period, the oxidation-reduction potential is constantly kept in the state larger than 300mV, accordingly, the situation that metal components in the slurry are oxidized, and consequently PbCu0 alloy is formed in the reduction cementation process is prevented, and the leaching rate of Pb, Cu, Cd and Zn ions is obviously increased.

Description

Technical field[0001]The invention belongs to the technical field of waste incineration fly ash treatment, and specifically relates to a resource treatment method for reducing the amount of domestic waste incineration fly ash.Background technique[0002]As of 2016, the average transportation volume of domestic waste in my country was 170 million tons. Over the years, untreated municipal domestic waste has reached 7 billion tons, with an average annual increase of 8-10%. Due to the pollution of organic and inorganic pollutants in the fly ash from incineration, how to effectively and safely dispose of waste incineration fly ash and realize its resource utilization is very important. Domestically, cement solidification and chelating agent stabilization methods are mainly used to dispose of fly ash. The solidified fly ash is mainly transported to a domestic waste landfill for landfill, or pre-processed and co-processed in a cement kiln to prepare cement. When fly ash is used in a large am...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B15/00C22B19/20C22B19/30C22B26/20C25C1/12C25C1/16C01F11/46C22B13/00C22B17/00
CPCC01F11/46C22B7/006C22B7/007C22B7/02C22B13/045C22B15/0089C22B17/04C22B19/20C22B19/30C22B26/20C25C1/12C25C1/16Y02P10/20
Inventor 叶珍任凌伟许李刘建磊钟宇驰
Owner 杭州灰弘环保科技有限公司
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