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Method for microwave heating detoxication for flying ash from incineration of refuse

A technology of waste incineration fly ash and microwave heating, which is used in the removal of solid waste and other directions to achieve the effect of high speed and low energy consumption

Active Publication Date: 2008-12-10
TIANJIN YIMING ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method only has a certain reduction and detoxification effect on slag containing strong oxidizing chromium, and is not suitable for waste incineration fly ash containing copper, lead, zinc, cadmium, chromium and other heavy metals.

Method used

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  • Method for microwave heating detoxication for flying ash from incineration of refuse
  • Method for microwave heating detoxication for flying ash from incineration of refuse
  • Method for microwave heating detoxication for flying ash from incineration of refuse

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The waste incineration fly ash was taken and placed in the fly ash storage tank, and the types and quantities of heavy metals in the waste incineration fly ash were determined by scanning inductively coupled plasma emission spectroscopy (ICP-AES). The results are shown in Table 1.

[0028] Table 1

[0029]

[0030] It can be seen from Table 1 that the leaching toxicity of various heavy metals contained is lower than the solid waste leaching toxicity identification standard (GB5085.3-1996), which meets the emission requirements. It only needs to use microwave heating to decompose and remove dioxins in waste incineration fly ash. The feeding speed and discharging speed are both set at 2.5t / h, the heating temperature is 850°C, and the residence time of fly ash in the microwave heater is 10min. Waste incineration fly ash flows into the feeder from the bottom of the fly ash storage tank, and then enters the microwave heater through the outlet of the feeder. When the firs...

Embodiment 2

[0040] The waste incineration fly ash was taken and placed in the fly ash storage tank, and the types and quantities of heavy metals in the incineration fly ash were determined by scanning inductively coupled plasma emission spectroscopy (ICP-AES). The measurement results are shown in Table 4.

[0041] Table 4

[0042]

[0043] It can be seen from Table 4 that the leaching toxicity of various heavy metals contained is higher than the solid waste leaching toxicity identification standard (GB5085.3-1996). The feeding speed and discharging speed are set to be 0.2t / h, the heating temperature is 1200°C, and the residence time of fly ash in the microwave heater is 60min. The fly ash flows out from the bottom of the fly ash storage tank into the feeder, and then feeds into the microwave heater through the outlet of the feeder. When the first batch of fly ash 10kg enters the microwave heater, start the microwave power supply and stop the feeder Feeding, after the temperature indic...

Embodiment 3

[0052] The waste incineration fly ash was taken and placed in the fly ash storage tank, and the types and quantities of heavy metals in the incineration fly ash were determined by scanning inductively coupled plasma emission spectroscopy (ICP-AES). The measurement results are shown in Table 7.

[0053] Table 7

[0054]

[0055] It can be seen from Table 7 that the leaching toxicity of only two heavy metals, Zn and Pb, is higher than the identification standard for leaching toxicity of solid waste (GB5085.3-1996). The ash is placed in a fly ash storage tank. Set both the feeding speed and the discharging speed to be 1.0t / h, the heating temperature is 1000°C, and the residence time of the fly ash in the microwave heater is 30min. The fly ash flows out from the bottom of the fly ash storage tank into the feeder, and then enters the microwave heater through the outlet of the feeder. When the first batch of fly ash 15kg enters the microwave heater, start the microwave power su...

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Abstract

The invention discloses a method for detoxicating municipal solid waste incineration fly ash by microwave heating, which includes the following steps: (1) the heavy metal leaching content of the municipal solid waste incineration fly ash is sampled and detected; (2) the municipal solid waste incineration fly ash is fed into a microwave heater through a feeder; (3) the municipal solid waste incineration fly ash is heated under a temperature of 850-1200 DEG C; (4) the detention time of the fly ash in the microwave heater is controlled within 10-60 minutes; (5) the heavy metal is absorbed and enriched by activated carbon, then waste gas generated is pumped into Mg(OH)2 solution for deacidification treatment and is discharged into the atmosphere; and (6) the fly ash after treating is discharged in the form of a cloddy solidified body and is detected according to a standard. The processing method of the invention has fast speed, low energy consumption, and complete detoxification, is especially suitable for treating the fly ash which simultaneously contains a plurality of heavy metals, and has no special requirements on heating atmosphere. The method of the invention is suitable for the harmless treatment of the municipal solid waste incineration fly ash and poisonous and harmful powder solid wastes which contain heavy metal, dioxin and the like, in the environmental protection industry.

Description

technical field [0001] The invention relates to a harmless treatment method for waste incineration fly ash, in particular to a method for treating waste incineration fly ash by adopting melting and solidification technology. Background technique [0002] Waste incineration fly ash belongs to hazardous solid waste. The main reason for the high toxicity of fly ash is that some heavy metals volatilize at high temperature during waste incineration, and then condense and attach to fly ash particles in the flue gas purification system; in addition, dioxins generated by waste incineration will also attach to fly ash particles . Therefore, waste incineration fly ash often contains heavy metals such as lead (Pb) and cadmium (Cd) in high leached concentrations, and also contains high concentrations of dioxins, and generally needs to be cured / stabilized before final disposal . [0003] At present, the common methods of fly ash disposal mainly include: cement solidification, asphalt ...

Claims

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Application Information

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IPC IPC(8): B09B3/00
Inventor 郝辉
Owner TIANJIN YIMING ENVIRONMENTAL TECH CO LTD
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