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Harmless treatment method for treating incineration fly ash through cooperative treatment of chromium slag

A technology of harmless treatment and co-processing, applied in the interdisciplinary field, can solve problems such as short process flow, and achieve the effect of alleviating resource depletion, low cost of raw materials and saving production cost.

Active Publication Date: 2019-12-20
BEIJING GEOENVIRON ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies in the above problems, the present invention provides a harmless treatment method for co-processing incineration fly ash using chromium slag; it can avoid the pollution problem caused by a large amount of chromium slag stockpiling, and realize the harmless treatment of incineration fly ash It can realize the recycling of chromium slag and fly ash at the same time, with short process flow and wide adaptability of raw materials, achieving the dual purpose of economic benefit and environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This embodiment provides a harmless treatment method for co-processing incineration fly ash using chromium slag, which includes the following steps:

[0049] 1) Raw material preparation: The raw materials required by the preparation method include pretreated fly ash, chromium slag, waste glass powder, additives, and reduced coal. The waste materials need to be crushed before mixing. The materials should be ground to a sufficient particle size. The particle size should be below 5mm. After the sieving particle size is too large, the crushing and grinding process must be performed again.

[0050] Using hazardous waste chromium residue stored in a chromium salt production enterprise as raw material, its main chemical components are as follows:

[0051] Silicon dioxide 9.57%, aluminum oxide 4.58%, calcium oxide 31.11%, magnesium oxide 21.79%, iron oxide 8.13%, chromium oxide (Cr 2 O 3 ) 3.44%, chromium hexaoxide (Cr 2 O 6 ) 0.5% and sodium dichromate (Na 2 Cr 2 O 7 ) About 1% and s...

Embodiment 2

[0063] This embodiment provides a harmless treatment method for co-processing incineration fly ash using chromium slag, which includes the following steps:

[0064] 1) Raw material preparation: The raw materials required by the preparation method include pretreated fly ash, chromium slag, waste glass powder, additives, and reduced coal. The waste materials need to be crushed before mixing. The materials should be ground to a sufficient particle size. The particle size should be below 5mm. After the sieving particle size is too large, the crushing and grinding process must be performed again.

[0065] Using hazardous waste chromium residue stored in a chromium salt production enterprise as raw material, its main chemical components are as follows:

[0066] Silicon dioxide 9.57%, aluminum oxide 4.58%, calcium oxide 31.11%, magnesium oxide 21.79%, iron oxide 8.13%, chromium oxide (Cr 2 O 3 ) 3.44%, chromium hexaoxide (Cr 2 O 6 ) 0.5% and sodium dichromate (Na 2 Cr 2 O 7 ) About 1% and s...

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Abstract

The invention discloses a harmless treatment method for treating incineration fly ash through cooperative treatment of chromium slag. The harmless treatment method comprises the following steps of pre-treating fly ash; pre-treating fly ash, chromium slag, waste glass powder and an additive as raw materials; and crushing, proportioning, uniformly mixing, roasting and cooling the raw materials to obtain the molten glass body. The method not only can avoid the pollution problem caused by large bulk storage of the chromium slag, realizes harmless treatment of the incineration fly ash, and can synchronously realize the recycling of the chromium slag and the fly ash; the finished product leaching rate index is lower than the leaching toxicity identification standard value in the "leaching toxicity identification standard" (GB 5085.3-2007); and the process flow is short, the raw material adaptability is wide, and the dual purposes of economic benefit and environmental protection are achieved.

Description

Technical field [0001] The invention relates to the technical field of hazardous waste disposal and man-made building materials, in particular to a harmless treatment method for co-processing incineration fly ash using chromium slag, and is a new method of interdisciplinary. Background technique [0002] Chromium slag is an industrial waste slag produced during the production of metallic chromium and chromium salt. The chromium residue contains hexavalent chromium, which is extremely toxic, and the hexavalent chromium compound has strong oxidizing properties and is very harmful to human health. It is one of the internationally recognized hazardous solid wastes. Large amounts of chromium residues not only cause the occupation of land resources, but also cause serious pollution of the groundwater and soil in the storage area. At present, the treatment methods of chromium slag mainly include chromium slag instead of dolomite sintering iron smelting, as cement mineralizer, dry and w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00
Inventor 贺真刘文莉马强虢德威杨远行
Owner BEIJING GEOENVIRON ENG & TECH