Co-processing method for household garbage incineration fly ash and yellow iron tailings

A domestic waste incineration and co-processing technology, which is applied in the production of bulk chemicals and the removal of solid waste, can solve the problems of inability to neutralize the acidity of the lower ore matrix, pH value reduction, soil re-acidification, etc., and achieve harmless disposal Solve and prevent the effect of continued oxidation and re-acidification

Active Publication Date: 2021-10-01
杭州灰弘环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method used in practical engineering applications is to block oxygen by simply covering the topsoil or planting vegetation to cut off the acidification conditions of the ore sand. However, the effect of this treatment is not good. The oxygen was not completely isolated, and less than a year after the planting of the unimproved ore sand covering soil, it was found that the soil reacidification was serious, the pH value decreased significantly, and the vegetation regreening effect was poor.

Method used

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  • Co-processing method for household garbage incineration fly ash and yellow iron tailings
  • Co-processing method for household garbage incineration fly ash and yellow iron tailings

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Mix the fly ash mixture mixed with 25% pyrite tailings sand and water at a solid-to-liquid ratio of 1:3 to form a slurry with a pH value of 12 and place it in a high-temperature and high-pressure reactor; Thermal reaction, the pressure is 5Mpa, O 3 Reaction 10min, O 3 The flow rate is 30mL / min; the high-temperature and high-pressure reactor continues to heat up to the extraction temperature of 275°C, and the pressure is maintained at 5Mpa to make the water in a subcritical state, and the O 3 Reaction 20min, O 3 The flow rate of the high-temperature and high-pressure reactor is 30mL / min; 3 Reaction 2min, O 3 The flow rate of the reactor is 30mL / min; after the three reaction stages are completed, the slurry in the reactor is subjected to solid-liquid separation to obtain a solid product.

[0036] Solid products are prepared according to the HJ 557 method; the concentration of heavy metals should not exceed the maximum allowable discharge concentration limit specified ...

Embodiment 2

[0043] Mix the fly ash mixture mixed with 35% pyrite tailings sand and water at a solid-to-liquid ratio of 1:5 to form a slurry. The pH value of the slurry is 11.5, and it is placed in a high-temperature and high-pressure reactor; Thermal reaction, the pressure is 5Mpa, O 3 Reaction 10min, O 3 The flow rate is 50mL / min; the high-temperature and high-pressure reactor continues to heat up to the extraction temperature of 300°C, and the pressure is maintained at 5Mpa to make the water in a subcritical state, and the O 3 Reaction 15min, O 3 The flow rate of the high-temperature and high-pressure reactor is 50mL / min; 3 Reaction 3min, O 3 The flow rate of the reactor is 50mL / min; after the three reaction stages are completed, the slurry in the reactor is subjected to solid-liquid separation to obtain a solid product. The solid product is prepared according to the HJ557 method, and the leaching concentration of heavy metals should not exceed the maximum allowable discharge concen...

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Abstract

The invention discloses a co-processing method for household garbage incineration fly ash and yellow iron tailings. The method comprises the following steps of S1, mixing yellow iron tailing sand with the fly ash to prepare slurry; S2, putting the slurry into a reaction kettle, and sequentially carrying out a hydrothermal reaction stage, a transition stage and a supercritical oxidation reaction stage; S3, carrying out solid-liquid separation on the treated slurry to obtain a solid product and filtrate; and S6, excavating surface tailing sand from a pyrite tailing pond site; covering the pyrite tailing pond site with solid products and compacting the solid products to serve as a tailings covering layer; and using the tailing covering layer to prevent oxygen and rainwater from infiltrating, and neutralizing the yellow iron tailing sand below the tailing covering layer by utilizing the alkalinity of the tailing covering layer. A vegetation planting layer is laid on the tailing covering layer; and the vegetation planting layer is obtained by mixing surface tailing sand, the solid products obtained in S5, a water-retaining agent and an organic fertilizer. According to the method, magnetite can be generated in the hydrothermal reaction process by utilizing ferrous ions of the yellow iron tailing sand; and the magnetite can catalytically oxidize dioxin in the presence of ozone.

Description

technical field [0001] The invention relates to the technical field of garbage incineration fly ash treatment and the technical field of environmental restoration, in particular to a method for co-processing domestic garbage incineration fly ash and pyrite tailings. Background technique [0002] In recent years, with the acceleration of urbanization and the improvement of living standards, urban solid waste has increased sharply. It is an urgent problem to be solved to realize the harmless, reduced, and resource-based treatment of urban domestic waste. The state encourages and Support the comprehensive utilization of waste incineration fly ash resources, but waste incineration fly ash has complex surface characteristics, absorb or form high concentrations of inorganic and organic pollutants from the flue gas, especially waste incineration fly ash often contains high concentrations Heavy metals and traces of highly toxic dioxin-like compounds are a double-material hazardous w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B5/00B09B3/00Y02P20/54
Inventor 任凌伟许李叶珍刘建磊
Owner 杭州灰弘环保科技有限公司
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