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Method for stabilization heavy metal in fly-ash, bottom slag and soil

A heavy metal and fly ash technology, applied in the field of stabilizing fly ash, bottom slag and heavy metals in soil, can solve problems such as soil acidification and affecting the health of operators

Inactive Publication Date: 2009-02-11
陈鸿亮
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the use of phosphoric acid is easy to produce irritating odorous gas products such as phospholene when adding bottom slag or fly ash, which affects the health of operators; and phosphoric acid is acidic and easy to corrode related processing equipment. When added to polluted soil, it is easy to cause soil acidification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Incinerate fly ash from a waste incineration plant in the northern district of Taiwan, mix reaction ash and boiler ash, add dry powdered sodium silicate and calcium silicate to the fly ash in this example, use dry powdered sodium silicate and Calcium silicate is directly added to the fly ash, and then mixed with a stirrer or a stirring drum, and the amount of Pb dissolution is analyzed by TCLP test. According to the experimental results (as shown in Table 1), the addition of sodium silicate and calcium silicate can effectively reduce the dissolution of heavy metal Pb in fly ash.

[0016] Table 1 Example 1 Test results

[0017] Numbering

[0018] Therefore, adjusting the content of different silicates can effectively reduce the dissolution of Pb; in addition, if it is to comply with the Environmental Protection Agency’s hazardous industrial waste identification standards and the dissolution standard of the reuse regulations, the dissolution of Pb must be less ...

Embodiment 2

[0020] The bottom slag of a garbage incineration plant in North District of Taiwan was incinerated. After the ferrous metals, non-ferrous metals and unburned materials were screened by the sorting plant, dry powdered sodium silicate and calcium silicate were added in this example to dry Powdered sodium silicate and calcium silicate are directly added to the incineration bottom slag, and then mixed with a stirrer or a stirring drum, and the dissolved amount of Pb is analyzed by TCLP test. According to the experimental results (as shown in Table 2), the addition of sodium silicate and calcium silicate can effectively reduce the dissolution of heavy metal Pb in the bottom slag.

[0021] Table 2 Example 2 Test results

[0022] Numbering

[0023] Therefore, adjusting the content of different silicates can effectively reduce the dissolution of Pb; in addition, if it is to comply with the Environmental Protection Agency’s hazardous industrial waste identification standards...

Embodiment 3

[0025] In a soil area with high leaching of heavy metals in the northern district of Taiwan, in this example, dry powdered sodium silicate and calcium silicate were added respectively, and the dry powdered sodium silicate and calcium silicate were sprayed on the soil surface first, and then used The tiller was used for stirring and mixing, and the leaching of Pb was analyzed by TCLP test. According to the experimental results (as shown in Table 3), the addition of sodium silicate and calcium silicate can effectively reduce the dissolution of heavy metal Pb in the soil.

[0026] Table 3 Example 3 Test results

[0027] Numbering

[0028] Therefore, adjusting the content of different silicates can effectively reduce the leaching of Pb; in addition, the Environmental Protection Agency has not regulated the amount of heavy metals leaching from the soil, but adding silicate to the soil can still reduce the leaching of heavy metals, so as to avoid the absorption of leachin...

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PUM

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Abstract

The invention relates to a method for stabilizing heavy metals in flying ash, bottom slag or in soil of refuse incineration. The function of the method is that: with silicate as a stabilizing agent and by using a spraying mode or a directly adding mode, the flying ash and bottom slag of refuse incineration or the soil is added with the stabilizing agent, and a stable substance is formed by the silicate or resolvable silicate ions in the stabilizing agent and the heavy metals in flying ash and bottom slag of refuse incineration or in soil so that the heavy metals (especially lead) in flying ash and bottom slag of refuse incineration or in soil are not easy to dissolve out or can be reduced under the erosion of natural environment, meets relevant standards on dissolution and recycling.

Description

technical field [0001] The present invention uses silicate substances as stabilizers, utilizes silicate substances in stabilizers and soluble silicate ions to form stabilizers with bottom slag, fly ash and heavy metals in soil, so that bottom slag, fly ash and The heavy metals (especially lead) in the soil meet the dissolution test standards or can be reduced and are not easy to dissolve under the erosion of the natural environment. Background technique [0002] Generally speaking, incineration ash is composed of bottom slag and fly ash. Bottom slag is the residue on the hearth after garbage incineration, mainly non-combustible inorganic substances, such as glass, sand, ceramics, etc., produced from the hearth After being released, it is quenched by humidity adjustment, so the water content is high, the black color presents an odor, and the particle distribution range is wide. Fly ash is divided into boiler ash and reaction ash. Boiler ash is usually produced by blowing off...

Claims

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Application Information

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IPC IPC(8): A62D3/33A62D101/43
Inventor 陈鸿亮
Owner 陈鸿亮
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