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Stabilizing agent for treating waste incineration fly ash, preparation method and application thereof

A waste incineration fly ash and stabilization technology, which is applied in the direction of chemical instruments and methods, solid waste removal, transportation and packaging, etc., can solve the problem that the long-term safety requirements of hazardous waste treatment cannot be met, the removal effect of heavy metal ions is not ideal, Difficult sources of raw materials and other issues, to achieve the effect of excellent operability, wide application range, and short reaction time

Active Publication Date: 2017-08-18
NANJING XINHAO POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inorganic stabilizers are commonly used, including sulfide, silicate, lime, etc. Compared with the solidification technology, the volume of the treated waste is small, but when the environmental pH conditions change, the heavy metals in the waste will be affected by the Leaching occurs and leaching occurs, which cannot meet the long-term safety requirements of hazardous waste treatment
The history of development and application of organic stabilizing agents is not long. The rapid development of this method is chelating agent heavy metal stabilizing agent. The key technology is the curing effect of chelating agent on heavy metal ions. Derivatives, organic polyphosphoric acid and its salts, and chitosan derivatives, etc., can slow down the leaching of heavy metals in the disposal due to environmental pH changes, but the removal effect of heavy metal ions in fly ash is not ideal, and the presence of reagents Due to the high production cost and difficult source of raw materials, it is difficult to popularize and apply it in large quantities.

Method used

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  • Stabilizing agent for treating waste incineration fly ash, preparation method and application thereof
  • Stabilizing agent for treating waste incineration fly ash, preparation method and application thereof
  • Stabilizing agent for treating waste incineration fly ash, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In the first step, add 150Kg of pure water to the reaction kettle, under stirring, the rotation speed is 70 rpm, slowly add 200kg of sodium ethylthiocarbamate required for production into the reaction kettle, and dissolve completely after stirring for 30 minutes After that, the intermediate product a is obtained.

[0024] In the second step, in the dissolving tank, 150Kg of water was added, and 200Kg of dimercaptopropanol was added for dissolution to obtain a uniform liquid b.

[0025] In the third step, the products a and b are mixed evenly in the reactor.

[0026] The fourth step is to add 295Kg of potassium dihydrogen phosphate and 5Kg of methyl cellulose to the reaction kettle in sequence at room temperature of 25°C, stir and dissolve, and obtain the product after filtration.

Embodiment 2

[0028] The first step, add 130Kg of pure water in reactor, under stirring, rotating speed is 80 rev / mins, 300kg of potassium dimethyl thiocarbamate required for production is slowly added in reactor, after stirring for 30 minutes, After complete dissolution, intermediate a was obtained.

[0029] In the second step, in the dissolving tank, 130Kg of water was added, and 100Kg of dimercaptopropanol was added for dissolution to obtain a uniform liquid b.

[0030] In the third step, the products a and b are mixed evenly in the reactor.

[0031] The fourth step is to add 290Kg of potassium dihydrogen phosphate and 50Kg of dimethyl cellulose to the reaction kettle in sequence at room temperature of 25°C, stir and dissolve, and obtain the product after filtration.

Embodiment 3

[0033] The first step, add 140Kg of pure water in the reaction kettle, under stirring, the rotating speed is 70 rpm, slowly add 300kg of sodium diethylthiocarbamate required for production into the reaction kettle, after stirring for 30 minutes, completely After dissolution, intermediate a is obtained.

[0034] In the second step, in the dissolving tank, 140Kg of water was added, and 100Kg of dimercaptopropanol was added for dissolution to obtain a uniform liquid b.

[0035] In the third step, the products a and b are mixed evenly in the reactor.

[0036] The fourth step is to add 300Kg of sodium dihydrogen phosphate and 20Kg of methyl cellulose to the reactor at normal temperature of 25°C, stir and dissolve, and filter to obtain the product.

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Abstract

The invention discloses a stabilizing agent for treating waste incineration fly ash. The stabilizing agent comprises the raw materials of alkyl dithiocarbamate, dimercaprol dimercaptopropanol, cellulose, phosphate and water. The stabilizing agent for treating the waste incineration fly ash has the following advantages: the fly ash produced in technologies for incinerating wastes of different type can be treated, so that the applicable scope is wide; effective reaction can be finished under the pH of 4-14 of aqueous solution; the stabilizing agent can be chelated with different heavy metal ions in the waste incineration fly ash in order to generate chelate precipitate which cannot be dissolved in water; in addition, the reaction costs a little time, and the removing efficiency is high; the comprehensive treatment cost is low; the operation is convenient; the stabilizing agent is environmentally friendly, safe and nontoxic; compared with national and international well-known similar products, the stabilizing agent has the advantages that the removing efficiency is high and the operability is outstanding under the same dosage, and the treatment cost per ton is greatly decreased.

Description

technical field [0001] The invention relates to a stabilizing agent for waste incineration fly ash, a preparation method and application thereof, and belongs to the field of solid waste treatment. Background technique [0002] With the development of my country's social economy, the acceleration of urbanization and the improvement of people's material life, the annual output of urban domestic waste in the country has reached more than 150 million tons, and it is increasing at a rate of 8% to 10% per year. Waste incineration power generation can greatly alleviate the plight of urban waste landfills becoming increasingly saturated, and has been vigorously developed in my country in recent years. During the incineration process of garbage, the heavy metals contained in it will enter into the flue gas due to its low boiling point, and finally condense and enrich in the fly ash. If the fly ash is not solidified safely and stably before landfill or secondary use The heavy metals ...

Claims

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Application Information

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IPC IPC(8): A62D3/33B09B3/00
CPCA62D3/33B09B3/20
Inventor 芮立新王虎让芮子豪
Owner NANJING XINHAO POLYMER MATERIAL
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