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A harmless treatment method for co-processing incineration fly ash using chromium slag

A technology of harmless treatment and co-processing, applied in the interdisciplinary field, can solve problems such as short process flow

Active Publication Date: 2021-07-06
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, including the following steps:

[0049] 1) Raw material preparation: raw materials required for the preparation method, including pretreated fly ash, chrome slag, waste glass powder, additives, reduced coal. The waste materials need to be crushed before mixing, and the materials should be ground to a sufficient particle size. The particle size should be crushed below 5mm.

[0050] The hazardous waste chromium slag stored by a chromium salt production enterprise is used as raw material, and its main chemical composition is as follows:

[0051]Silicon dioxide 9.57%, aluminum oxide 4.58%, calcium oxide 31.11%, magnesium oxide 21.79%, ferric 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%. The main minerals contained in chromium slag are periclase (MgO), calcium silicate (2Ca...

Embodiment 2

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

[0064] 1) Raw material preparation: raw materials required for the preparation method, including pretreated fly ash, chrome slag, waste glass powder, additives, reduced coal. The waste materials need to be crushed before mixing, and the materials should be ground to a sufficient particle size. The particle size should be crushed below 5mm.

[0065] The hazardous waste chromium slag stored by a chromium salt production enterprise is used as raw material, and its main chemical composition is as follows:

[0066] Silicon dioxide 9.57%, aluminum oxide 4.58%, calcium oxide 31.11%, magnesium oxide 21.79%, ferric 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%. The main minerals contained in chromium slag are periclase (MgO), calcium silicate (2C...

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Abstract

The invention discloses a harmless treatment method for co-processing incineration fly ash by using chromium slag. After crushing, batching, mixing, roasting and cooling, a molten glass body is obtained after cooling. The invention can not only avoid the pollution problem caused by a large amount of chromium slag stockpiling, realize the harmless treatment of incineration fly ash, but also simultaneously realize the resource utilization of chromium slag and fly ash; (GB5085.3-2007) standard value for the identification of leaching toxicity; short process flow, wide adaptability of raw materials, to achieve the dual purpose of economic benefits and environmental protection.

Description

technical field [0001] The invention relates to the technical fields of hazardous waste disposal and artificial building materials, in particular to a harmless treatment method for co-processing incineration fly ash by using chromium slag, which is a new interdisciplinary method. Background technique [0002] Chromium slag is an industrial waste produced during the production of metallic chromium and chromium salts. Chromium slag contains extremely toxic hexavalent chromium, and hexavalent chromium compounds have strong oxidizing properties and are very harmful to human health. They are one of internationally recognized hazardous solid wastes. A large amount of chromium slag stockpiling not only causes the occupation of land resources, but also causes serious pollution to groundwater and soil in the stockpiling area. At present, the treatment methods of chromium slag mainly include chromium slag instead of dolomite sintering ironmaking, cement mineralizer, dry and wet detox...

Claims

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Application Information

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Patent Type & Authority Patents(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