Waste incineration fly ash heavy metal inorganic composite stabilizing agent and stabilizing and curing method thereof

A technology of waste incineration fly ash and inorganic compounding, which is applied to the protection device for preventing harmful chemicals, etc., can solve the problems of complex compound prescription, high cost of harmless treatment, and large amount of compound medicine, and achieves good application prospects, Easy to store for a long time, low cost effect

Inactive Publication Date: 2021-01-05
NEIJIANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are deficiencies in heavy metal stabilized compound agents: 1. The amount of some compound agents is large, and the cost of harmless treatment is high
2. Complicated formulations of compound medicines or complex operation steps increase processing costs

Method used

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  • Waste incineration fly ash heavy metal inorganic composite stabilizing agent and stabilizing and curing method thereof
  • Waste incineration fly ash heavy metal inorganic composite stabilizing agent and stabilizing and curing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The object of treatment is fly ash 1. The leaching shows that the heavy metals lead (10.59mg / L) and cadmium (0.204mg / L) exceed the standard, and the lead seriously exceeds the standard.

[0033] Take 100 parts of waste incineration fly ash and add 6 parts of heavy metal inorganic composite stabilizer (calcium hydroxide: sodium dihydrogen phosphate: ferrous sulfate = 1:1:1), stir and mix evenly, add 70 parts of water and fully stir to obtain a slurry Shaped mixture, natural conservation for 5 days. The leaching concentrations of heavy metals lead and cadmium were 0.236mg / L and 0.142mg / L, respectively, both of which were lower than the entry control standards for domestic waste landfills.

Embodiment 2

[0035] The object of treatment is fly ash 1. The leaching shows that the heavy metals lead (10.59mg / L) and cadmium (0.204mg / L) exceed the standard, and the lead seriously exceeds the standard.

[0036] Take 100 parts of waste incineration fly ash and add 4 parts of heavy metal inorganic composite stabilizer (calcium hydroxide: sodium dihydrogen phosphate: ferrous sulfate = 2:1:1), stir and mix evenly, add 70 parts of water and fully stir to obtain a slurry To form the mixture, add 10 parts of cement, stir and mix evenly, and then maintain it naturally for 5 days. The leaching concentrations of heavy metals lead and cadmium were 0.211mg / L and 0.097mg / L, respectively, both of which were lower than the entry control standards for domestic waste landfills.

Embodiment 3

[0038] The object of treatment is fly ash 1. The leaching shows that the heavy metals lead (10.59mg / L) and cadmium (0.204mg / L) exceed the standard, and the lead seriously exceeds the standard.

[0039] Take 100 parts of waste incineration fly ash and add 8 parts of heavy metal inorganic composite stabilizer (bentonite: disodium hydrogen phosphate = 3:1), stir and mix evenly, add 100 parts of water and stir thoroughly to obtain a slurry mixture, and naturally cure for 5 days. The leaching concentrations of heavy metals lead and cadmium were 0.142mg / L and 0.109mg / L, respectively, both of which were lower than the entry control standards for domestic waste landfills.

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Abstract

The invention discloses a waste incineration fly ash heavy metal inorganic composite stabilizing agent which can reduce the treatment cost and is environmentally friendly and a stabilizing and curingmethod thereof. The waste incineration fly ash heavy metal inorganic composite stabilizing agent is prepared from ferrous sulfate, sodium dihydrogen phosphate, disodium hydrogen phosphate, potassium pyrophosphate, bentonite, kaolin, calcium oxide and calcium hydroxide, wherein the mass ratio of any two components is 1-5: 1. The stabilizing and curing method of the waste incineration fly ash heavymetal inorganic composite stabilizing agent comprises the following steps: S1, selecting components of the heavy metal inorganic composite stabilizing agent, and S2, stabilizing heavy metals in the waste incineration fly ash. The waste incineration fly ash heavy metal inorganic composite stabilizing agent and the stabilizing and curing method thereof are adopted, raw materials are easy to obtain,the dosage is small, the agent cost is low, the stabilizing/curing process is simple, a cured body is stable, good acid and alkali resistance is achieved, and secondary pollution to the environment isavoided. The stabilizing agent has a good curing effect on heavy metals in the household garbage incineration fly ash.

Description

technical field [0001] The invention relates to the field of environmental protection treatment, in particular to a heavy metal inorganic composite stabilizer for waste incineration fly ash and a method for stabilizing and curing the same. Background technique [0002] With the rapid development of urbanization in my country, the output of municipal solid waste is increasing day by day. In recent years, the generation of domestic waste has grown at a rate of 5-8%. In 2018, the national urban domestic waste removal volume reached 228.018 million tons. Waste disposal methods mainly include landfill, composting, and incineration. Among them, waste incineration has the characteristics of greatly reducing the quality and volume of municipal solid waste, sterilizing, occupying less land resources, and realizing energy conversion, and is widely used in countries all over the world (Liu Z Y, etal. Waste Management, 2019, 84: 329- 339.). According to relevant reports, it has been ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/33A62D101/08A62D101/43
CPCA62D3/33A62D2101/08A62D2101/43
Inventor 刘义武何清清张理元
Owner NEIJIANG NORMAL UNIV
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