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Method of rapidly removing harmful substance in waste incineration fly ashes

A technology of waste incineration and harmful substances, which is applied in the field of rapid removal of harmful substances in waste incineration fly ash, which can solve the problems of polluting water and soil environment, increasing the volume of waste, and inability to reuse fly ash, etc., achieving the effect of short processing time and low cost

Active Publication Date: 2012-04-18
NATIONAL UNITED UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method not only cannot reuse the fly ash, but also increases the waste volume, consumes the limited space of the landfill, and increases the disposal cost; Harmful substances in the cured product dissolve and pollute the water and soil environment

Method used

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  • Method of rapidly removing harmful substance in waste incineration fly ashes
  • Method of rapidly removing harmful substance in waste incineration fly ashes
  • Method of rapidly removing harmful substance in waste incineration fly ashes

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Embodiment Construction

[0027] Hereinafter, a preferred embodiment of the present invention is cited and described in detail in conjunction with the accompanying drawings as follows, wherein:

[0028] see figure 1 As shown, the method for fast removal of waste incineration fly ash harmful substances in a preferred embodiment of the present invention mainly includes the following steps:

[0029] The first step of the present invention is to get fly ash and clear water 100: in terms of waste incineration plant, fly ash is the combined fly ash collected by the air pollution control equipment of the waste incineration plant, and the clean water can be tap water, distilled water, or Softened water.

[0030] The second step of the present invention is stirring and extracting 110: adding clean water into the fly ash, fully stirring the fly ash and clean water in a high-speed stirring manner, crushing the fly ash for extraction. The weight ratio of clean water to fly ash (dry weight) is 2-5:1, the stirring...

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Abstract

The invention relates to a method of rapidly removing harmful substance in waste incineration fly ashes. The method includes the following steps of preparing the waste incineration fly ashes and the clean water, rapidly mixing the waste incineration fly ashes and the clean water and extracting the mixture under a low liquid-solid ratio, allowing the fly ash mud to stand and then dipping and extracting the mud, and carrying out the solid-liquid separation of the fly ash mud. After the above steps, the waste liquid is processed by a waste processing device, and the dehydrated fly ashes are dried and smashed. At the end, the toxicity characteristic leaching procedure leaching value and the Dioxin total value of the smashed fly waste ashes are detected, if the values are qualified, the smashed fly waste ashes are harmless and can be used once again, if the values are not qualified, the waste fly ashes are returned back to the fly ashes step. The invention takes the clean water as the extractant, and extracts the waste incineration fly ashes under the low liquid-solid ratio and the high speed stirring conditions, so the fly ashes can be released easily and can generate high concentration hydroxide ions in a liquid, and harmful solid substance can be changed into the water-soluble substance, and the harmful substance in the waste incineration fly ashes can be removed rapidly and effectively, and consequently the target of harmless fly ash recirculation is reached.

Description

technical field [0001] The present invention is related to the technical field of processing harmful fly ash produced by waste incineration. More specifically, it can quickly remove harmful heavy metals and dioxin substances in waste incineration fly ash, so that the detection of fly ash after treatment is lower than the legal standard, and the A method for the rapid removal of hazardous substances from waste incineration fly ash as a harmless and reusable substance. Background technique [0002] The fly ash produced after garbage incineration is often called garbage incineration fly ash. Since the incineration temperature is usually between 850-1050°C, the heavy metals in the garbage that have a lower boiling point than the incineration temperature are easy to gasify. With the exhaust gas and fly ash entering the air pollution control equipment of the incineration plant, the heavy metals condense and most of them adhere to On fly ash. In addition, if there are chlorine-co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
Inventor 张坤森邱孔滨
Owner NATIONAL UNITED UNIVERSITY
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