Method for efficiently and synergistically recycling chromium-containing waste slag and carbon-containing waste materials

A chromium waste slag and recycling technology, applied in the direction of improving process efficiency, etc., can solve the problems of inability to realize large-scale resource utilization of chromium-containing waste slag and carbon-containing waste, waste of energy, and adsorption capacity that cannot meet production needs, etc., to achieve high efficiency Large-scale disposal and utilization, broad application prospects, and the effect of thorough detoxification and resource utilization

Active Publication Date: 2021-05-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After repeated adsorption reactions of activated carbon, the internal chemical changes and structural changes will lead to a decrease in activity, a decrease in specific surface area, and the adsorption capacity cannot meet the production needs and become waste activated carbon.
The disposal of waste activated carbon and paint slag is usually activated regeneration and incineration, but there are problems such as long regeneration time, low regeneration efficiency, and waste of energy.
After crushing and grinding, adding paint slag and waste activated carbon to the sintered material can provide heat and reduce energy consumption. However, due to low surface activity, direct addition will deteriorate the granulation effect of the mixture, which limits its addition. quantity
[0007] In summary, the traditional sintering method can treat chromium-containing waste residue and carbon-containing waste to a certain extent, but it cannot realize the resource utilization of chromium-containing waste residue and carbon-containing waste on a large scale

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Mix chromium-containing waste residue, carbon-containing waste and binder according to a certain mass ratio to form composite pellets, and mix iron ore, flux, fuel, etc. to make pellets, and then layer the composite pellets and pellets The cloth is sent to the sintering machine for draft sintering to obtain chromium-containing sintered ore.

[0036] The chromium-containing waste residue is chromium salt residue, the carbon-containing waste is paint residue and waste plastics, the binder is bentonite, the flux is quicklime, the iron ore is chromite, and the fuel is coke powder.

[0037] The mass percentages of chromium-containing waste residue and carbon-containing waste material in the composite pellets are 70%:30%, and the fixed carbon content is 8.5%.

[0038] The composite pellets have a diameter of 6-8mm.

[0039] The mass percent of iron ore, flux and fuel in the described granular material is composed of (88.9%): (4.6%): (6.5%), and the particle size scope of gra...

Embodiment 2

[0046] Mix chromium-containing waste residue, carbon-containing waste and binder according to a certain mass ratio to form composite pellets, and mix iron ore, flux, fuel, etc. to make pellets, and then layer the composite pellets and pellets The cloth is sent to the sintering machine for joint roasting to obtain chromium-containing sintered ore.

[0047] The chromium-containing waste residue is ferrochrome slag and stainless steel pickling mud, the carbon-containing waste is waste activated carbon, the binder is humic acid, the iron ore is laterite nickel ore and magnetite, the flux is quicklime and dolomite, and the fuel is Burnt powder.

[0048] The mass percentages of chromium-containing waste residue and carbon-containing waste material in the composite pellets are 80%:20%, and the fixed carbon content is 9.6%.

[0049] The composite pellets have a diameter of 5-6mm.

[0050] The mass percent of iron ore, flux and fuel in the described granular material is composed of (...

Embodiment 3

[0057] Mix chromium-containing waste residue, carbon-containing waste and binder according to a certain mass ratio to form composite pellets, and mix iron ore, flux, fuel, etc. to make pellets, and then separate composite pellets and pellets Layers of cloth are sent to the sintering machine for joint roasting to obtain chromium-containing sintered ore, and the fuel is coke powder and anthracite.

[0058] The chromium-containing waste slag is chromium salt slag and ferrochrome slag, the carbon-containing waste is paint slag and municipal sludge, the binder is bentonite and humic acid, the iron ore is magnetite, and the flux is quicklime.

[0059] The mass percentages of chromium-containing waste residue and carbon-containing waste material in the composite pellets are 85%:15%, and the fixed carbon content is 6.7%.

[0060] The composite pellets have a diameter of 6-8mm.

[0061] The mass percent of iron ore, flux and fuel in the described granular material is composed of (90.4...

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Abstract

The invention discloses a method for efficiently and synergistically recycling chromium-containing waste slag and carbon-containing waste materials. The method comprises the following steps that raw materials including the chromium-containing waste slag and the carbon-containing waste materials are uniformly mixed and pelletized to obtain spherical materials; meanwhile, raw materials including an iron-containing raw material, a flux and fuel are uniformly mixed and granulated to obtain granules; and the spherical materials and the granules are mixed and then distributed in a layered manner to a sintering machine for air draft sintering to obtain the chromium-containing sintered ore. According to the method, the chromium-containing waste slag and the carbon-containing waste materials are efficiently and synergistically utilized in a resource mode in the iron-containing raw material sintering process, not only can thorough detoxification of the chromium-containing waste slag be achieved in one step, but also the chromium-containing waste slag and the carbon-containing waste materials can be utilized in the resource mode, high-quality furnace burden is provided for blast furnace smelting of chromium-containing molten iron, and obvious economic and environmental benefits are achieved.

Description

technical field [0001] The invention relates to a method for resource utilization of chromium-containing waste slag and carbon-containing waste, in particular to a method for utilizing sintering method in the process of iron ore sintering to realize the complete detoxification of chromium-containing waste slag and carbon-containing waste in one step As well as a method for obtaining high-quality chromium-containing composite sintered ore, it belongs to the technical field of metallurgy and environmental protection. Background technique [0002] my country is the world's largest consumer of chromium resources, and its chromium consumption exceeds one-third of the world's chromite ore output, but my country's annual chromite ore output is less than 1% of the world's annual output. The huge demand makes chromium become a One of the metals with the highest dependence on foreign countries in my country, the contradiction between supply and demand is very prominent. [0003] On th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/248C22B1/16C22B34/32
CPCC22B1/248C22B1/16C22B34/32Y02P10/20
Inventor 张元波苏子键涂义康姜涛李光辉范晓慧彭志伟饶明军朱应贤刘硕刘继成王嘉侯炜赵雪娟刘康林坤王琰成相霖
Owner CENT SOUTH UNIV
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