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Method for stabilizing fly ash from refuse incineration by combination of complementary type medicaments

A technology for waste incineration fly ash and incineration fly ash, which is applied in the direction of solid waste removal, etc., can solve the problems of prolonged treatment time, increased consumption, complicated system, etc., and achieves flexible implementation, reduced treatment costs, and enhanced stabilization effect. Effect

Inactive Publication Date: 2010-04-07
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing chemical stabilization treatment method is the process of using one or more chemical agents to convert toxic and harmful substances into substances with low solubility, low mobility and low toxicity through chemical reactions. Commonly used agents include phosphoric acid, mercury fixation agents, etc. Because a single medicament cannot meet the needs of stabilizing multiple heavy metals, multiple medicaments are often used at the same time. If multiple medicaments have adverse reactions with each other, the amount of use will increase; , system complexity
In order to meet the requirements of GB16889-2008, the existing chemical stabilization method uses a large amount and costs a lot

Method used

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  • Method for stabilizing fly ash from refuse incineration by combination of complementary type medicaments
  • Method for stabilizing fly ash from refuse incineration by combination of complementary type medicaments
  • Method for stabilizing fly ash from refuse incineration by combination of complementary type medicaments

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: to the processing of the fly ash that dioxin content is lower than 3 μ g I-TEQ / kg, concrete steps are as follows:

[0032] refer to figure 1 .

[0033] Step 1: Make a solution of a certain amount of class I agent z1 and water W, and mix it with fly ash F1; or mix F1, z1, and W directly. The mixture is opened to the air and stirred for a period of time, or the reactor R1 is blown into the air flow or the flue gas flow z2 for stirring to form the intermediate reactant F2.

[0034] z1 is ferrous salt or sulfide, or a mixture of iron powder and ferric oxygen salt; or a mixed agent that can rapidly produce ferrous ions in the liquid phase;

[0035] Step 2: Add the solution of Class II agent z3 continuously to the gray water mixture reactor R2 within 0.5-2h to mix with F2. R2 and R1 can be the same reactor or two separate reactors. Or R1 is the first half of the reactor and R2 is the second half of the reactor. z3 can be TMT, thiourea or other soluble organi...

Embodiment 2

[0043] Its technological process is as embodiment 1, and above-mentioned incineration fly ash of a certain incineration plant in East China, its dioxin content is 0.7 μ gI-TEQ / kg, detect heavy metal Pb according to leaching HJ / T299 leaching method, Cd exceeds toxicity leaching identification standard. Adopt method of the present invention here, the first step makes it mix with sodium sulfide solution, the consumption of sodium sulfide is 16.4kgS / ton 干灰 After vigorously stirring with air flow for 30 minutes, in the second step, add a solution made of TMT equivalent to 0.55% wt of fly ash, and mix evenly. The final liquid-solid ratio is 0.86:1, without liquid-solid separation. Curing and drying until the water content is below 30%, the leaching test is carried out according to the method of standard HJ / T 300, see Table 2, all indicators meet the requirements of GB16889-2008, and can be directly sent to the domestic waste landfill for separate landfill.

[0044] Table 2 Example ...

Embodiment 3

[0050] Its technological process is as embodiment 1, and above-mentioned incineration fly ash of a certain incineration plant in East China, its dioxin content is 0.7 μ gI-TEQ / kg, detect heavy metal Pb according to leaching HJ / T299 leaching method, Cd exceeds toxicity leaching identification standard. Adopt the method of the present invention, the first step makes it mix with iron powder and ferric sulfate solution that scrap iron is made, and the mol ratio of iron powder and ferric sulfate is 1.2: 1, the mixing of final iron powder and ferric sulfate makes total iron consumption 120kgFe / ton of fly ash, after vigorous stirring with air flow for 60min (pay attention to the timely discharge of gas and good ventilation during the process), the second step is to add a solution made of TMT equivalent to 0.1% wt of fly ash, and the final liquid-solid The ratio is 2.5:1, after stirring to make it evenly mixed; the third step is liquid-solid separation, and 2 / 3 of the separated process...

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Abstract

The invention belongs to the technical field of the harmless treatment of dangerous solid waste and particularly relates to a method for stabilizing fly ash from refuse incineration by the combination of complementary type medicaments. The stabilizing method combines a reducing inorganic medicament (I type medicament) capable of precipitating and absorbing Pb, Zn, Cd, Hg, Cr, Cu and other heavy metals and an heavy metal ion precipitation type organic chelating agent (II type medicament). The method comprises the following steps: firstly mixing the I type medicament with the fly ash first in aqueous solution or in the presence of water for reaction to generate ferric hydroxide for absorbing and precipitating heavy metals or generating sulfides of the heavy metals to precipitate the heavy metals; and then adding the II type medicament in the system to allow the II type medicament to further generate precipitate type chelates with the residual heavy metals, particularly Pb, Cd, Hg and the like. The first step of the method is characterized in that reducing atmosphere still remains after the reaction. As a major part of heavy metals are stabilized by chalybeate or the chalybeate, so the dosage of the II type medicament is reduced considerably.

Description

technical field [0001] The invention belongs to the technical field of harmless treatment of hazardous solid waste, and in particular relates to a method for stabilizing waste incineration fly ash with complementary medicaments. Background technique [0002] During the "Tenth Five-Year" and "Eleventh Five-Year Plan" periods, the incineration of domestic waste in my country has developed rapidly. According to the author's statistics on incinerators across the country, the current incineration capacity has exceeded 50,000 tons per day, and the amount of fly ash produced is half of the amount of waste incineration. 2% to 5%, while the fluidized bed incinerator produces more fly ash. Fly ash contains a lot of toxic and harmful substances, among which heavy metals include Pb, Cr, Cd, Cu, Zn, Hg and so on. Under certain conditions, these heavy metals in fly ash will seep out and cause water and soil pollution, which will have a serious impact on the environment and people's lives....

Claims

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Application Information

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IPC IPC(8): B09B1/00
Inventor 陈德珍周斌朱志宇刘会友
Owner TONGJI UNIV
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