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Device and method for removing heavy metal Pb from fly ash generated in sludge incineration

A sludge incineration and heavy metal technology, applied in the field of environmental engineering, can solve the problems of low comprehensive benefit, long process, high investment and operation costs, and achieve the effect of no secondary pollution, small amount of flue gas, and realization of recycling and reuse

Inactive Publication Date: 2011-09-14
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many problems in this method, such as the waste water and waste acid and alkali liquid produced in the extraction process must be strictly treated
Therefore, it has the disadvantages of long process, high investment and operating costs, easy to produce serious secondary pollution, and low comprehensive benefits.

Method used

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  • Device and method for removing heavy metal Pb from fly ash generated in sludge incineration
  • Device and method for removing heavy metal Pb from fly ash generated in sludge incineration
  • Device and method for removing heavy metal Pb from fly ash generated in sludge incineration

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Dry 20g of fly ash at 105°C for 24 hours, then add 1.65g of chlorinating agent NaCl according to the mass ratio of fly ash to equivalent chlorinating agent of 100:5 and mix evenly. , Slowly push the porcelain boat carrying 20g of sludge incineration fly ash into the furnace, at the same time adjust the carrier gas to the set flow rate of 100mL / min, close the furnace door and start the air pump, so that the fly ash stays under this condition for 40min. Under this condition, the removal rate of Pb in fly ash is 95.4%, and the leachate content of Pb in the residual fly ash after treatment is lower than the standard value of Pb for the toxicity identification of leachate from hazardous waste (GB5085-1996).

Embodiment 2

[0029] Dry 20g of fly ash at 105°C for 24 hours, then add 1.65g of chlorinating agent NaCl according to the mass ratio of fly ash to equivalent chlorinating agent of 100:5 and mix evenly. , Slowly push the porcelain boat carrying 20g of sludge incineration fly ash into the furnace, at the same time adjust the carrier gas to the set flow rate of 100mL / min, close the furnace door and start the air pump, so that the fly ash stays under this condition for 60min. Under this condition, the removal rate of Pb in the fly ash is 98.6%, and the leachate content of Pb in the residual fly ash after treatment is lower than the standard value of Pb for the toxicity identification of the leachate of hazardous waste (GB5085-1996).

Embodiment 3

[0031] Dry 50g of fly ash at 105°C for 24h, then add 7.82g of chlorinating agent CaCl according to the mass ratio of fly ash to equivalent chlorinating agent of 100:10 2 Mix evenly. When the hearth of the high-temperature atmosphere tube-type electric furnace reaches the preset temperature of 1000°C, slowly push the porcelain boat carrying 50g of sludge incineration fly ash into the furnace, and at the same time adjust the carrier gas to the set flow rate of 100mL / min and close the furnace Open the door and start the suction pump to make the fly ash stay under this condition for 40 minutes. Under this condition, the removal rate of Pb in fly ash is 95.1%, and the leachate content of Pb in the residual fly ash after treatment is lower than the standard value of Pb for the toxicity identification of leachate from hazardous waste (GB5085-1996).

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Abstract

The invention discloses a device and method for removing heavy metal Pb from fly ash generated in sludge incineration. In the device, a high-temperature atmosphere tubular electric furnace is adopted as the main body, the front end of the tubular furnace is connected with an air supply unit, the rear end of the tubular furnace is connected with a tail gas absorber; the high-temperature tubular furnace is provided with an artificially intelligent temperature adjustment system, and the adjustable range of temperature is from 0 to 1600 DEG C; and in the device, a porcelain boat carrying the fly ash generated in sludge incineration is slowly pushed into a hearth, and simultaneously, carrier gas is adjusted to a preset flow, a furnace door is closed and an air extracting pump is started, therefore, the fly ash stays for 40 to 60 minutes in the condition; and in the condition, the removing rate of Pb in the flay ash generated in sludge incineration reaches 95-99 percent. The device disclosed by the invention has a simple process flow, is easy to operate, generates a small amount of flue gas, and does not cause secondary pollution; and the device can also be used for recovering Pb and gas metal Pb in waste batteries, waste circuit boards and leftovers thereof, and electronic parts containing metal Pb.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering. In particular, the invention relates to a device for removing heavy metal Pb in sludge incineration fly ash and a removal method thereof. Background technique [0002] Solid waste incineration treatment can maximize the reduction, harmlessness and resource utilization of sludge, and can reduce the occupation of land resources and recycle heat energy. Compared with other disposal methods, it has obvious advantages. With the widespread adoption and promotion of municipal sludge incineration, a large amount of incineration fly ash is produced. Fly ash contains high leaching concentrations of heavy metals, salts, and highly toxic dioxins, furans (PCDD / Fs) and other harmful substances. If not properly treated or disposed of, heavy metals and harmful substances will migrate in the ecological environment and pollute the environment. groundwater, soil and air, ultimately endangering h...

Claims

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Application Information

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IPC IPC(8): F23G7/00
Inventor 刘敬勇孙水裕钟胜谢武明戴文灿宋卫锋黄绍松
Owner GUANGDONG UNIV OF TECH
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