Method for treating incinerated fly ash with harmful heavy metals

A treatment method, heavy metal technology, applied in the direction of lighting and heating equipment, etc., to achieve very effective and low-cost effects

Active Publication Date: 2010-06-09
YING CHENG ENVIRONMENTAL TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Another example is Invention Patent No. 407067 "Waste Disposal Method" is to add water glass and water to the waste to vibrate and stir to form lead silicate precipitation in the waste to stabilize the lead and achieve the purpose of stabilizing the harmful heavy metal lead However, this invention is still only combining water glass and water, that is, sodium silicate solution, and mixing and stirring water and heavy metal-containing waste for curing and curing

Method used

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  • Method for treating incinerated fly ash with harmful heavy metals
  • Method for treating incinerated fly ash with harmful heavy metals
  • Method for treating incinerated fly ash with harmful heavy metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Take reaction ash 10wt% and add water 100wt% at the same time, stir for 10 minutes and wash with water. Only a small amount of salt remains and the weight loss of quartz sand added therein is relatively large. The salt compounds of KCl and NaCl are also dissolved in water, and only compounds such as Ca and Si remain.

[0039] table 3

[0040]

Embodiment 2

[0042] Mix the reaction ash, quartz sand heavy medium and water in Example 1 with solid-liquid ore slurry without addition and with addition, and send them into the wet vortex separator by pressure pump respectively, with three different feed pressures of 20, 80 and 140Kpa Sorting by pressure makes the particles with large particles and high density move downward and outward along the tube wall, and flow out from the underflow port (UF for short). The inner vortex is carried by the inner vortex to the overflow port (Overflow referred to as OF) for discharge. The physical and chemical properties and elemental composition after sorting are shown in Table 4, Table 5, Table 6 and Table 7.

[0043] The model of the wet vortex separator used in this embodiment is Mozley C705 type, and the enrichment and separation of heavy metals in the incineration fly ash is carried out with the wet vortex separator with a diameter of 2 o'clock.

[0044] Table 4

[0045]

[0046] □The content...

Embodiment 3

[0060] Repeat Example 2, but only use reaction ash to add solid-liquid slurry with dense medium quartz sand, and carry out wet vortex separation with incineration fly ash / quartz sand: 2 / 1 and 3 / 1, the influence on the enrichment efficiency is obtained Such as Table 8 and Table 9.

[0061] Table 8

[0062]

[0063] Table 9

[0064]

[0065]

[0066] It can be seen from the above examples that the composition of the incineration fly ash of the present invention is mainly Ca, Si, K, Na, Cl, the contents of unburned carbon and activated carbon are respectively 0.219 and 11.73%, and the TCLP dissolution concentrations of Pb and Zn are relatively high And the dissolution concentration of Pb exceeded the standard of 5mg / l, which was 34.08mg / l.

[0067] Feed pressure has an effect on the efficiency of heavy metal enrichment in wet vortex cone separation. As the feed pressure increases, the efficiency of heavy metal enrichment also increases. The enrichment effect is the be...

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Abstract

The invention relates to a method for treating incinerated fly ash with harmful heavy metals, and provides a method capable of enabling waste particularly harmful heavy metals especially to be separated from the fly ash generated by a garbage incinerator. The invention is characterized in that quartz sand and water are added in the waste incinerated fly ash with harmful heavy metals, and using a wet turbine taper for screening and separating the harmful heaving metals.

Description

technical field [0001] The invention relates to a waste treatment method for harmless metal wastes containing harmful heavy metals, such as lead, cadmium, chromium, mercury, copper, zinc and the like. Background technique [0002] According to the statistical data of ash produced by 19 large-scale waste incineration plants in Taiwan, China in 2003, the fly ash collected by the waste gas treatment system is about 230,000 tons per year (about 19,000 tons per month) , After being stabilized in the middle, they will be sent to the final disposal sites designated by the environmental protection bureaus of various counties and cities for independent burial. [0003] The treatment control of fly ash is in accordance with the "General Waste Recycling and Clearance Treatment Measures". Solidification method, stabilization method, melting method, etc. can be used to limit the dissolution or movement of harmful components, and prevent pollution from infiltrating into soil or groundwat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23J15/02
Inventor 柯明贤
Owner YING CHENG ENVIRONMENTAL TECH
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