CN106500106B - A method of detoxified using sintering technology leached-out chromium residue - Google Patents
A method of detoxified using sintering technology leached-out chromium residue Download PDFInfo
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- CN106500106B CN106500106B CN201610833401.4A CN201610833401A CN106500106B CN 106500106 B CN106500106 B CN 106500106B CN 201610833401 A CN201610833401 A CN 201610833401A CN 106500106 B CN106500106 B CN 106500106B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/442—Waste feed arrangements
- F23G5/444—Waste feed arrangements for solid waste
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
A method of detoxified using sintering technology leached-out chromium residue, chromium slag is sieved, then with Water Quenching Slag and coke powder after batch mixer is sufficiently mixed, add water that particle is made, equably it is distributed on pallet, guarantee that mixture particle is paved and is covered with pallet to be sintered, controls firing temperature at 1100 DEG C -1200 DEG C；Bellows vacuum cavitations are sintered in 12kpa-13kpa；Vertical sintering speed 18mm/min or less；It is cooling that air blast is carried out to high temperature finished product sinter；It is sieved, obtains finished product sinter.Advantage is: rational technology, production energy consumption is low, save the cost, realizes the harmless treatment of chromium slag, and detoxify high-efficient, Cr in water logging sample6+Index is lower than national standard, is suitble to industrialization large scale processing.
Description
Technical field
This technology belongs to leached-out chromium residue removing toxic substances field, in particular to a kind of to be detoxified using sintering technology leached-out chromium residue
Method, it be it is a kind of using carbonaceous reducing agent and additive using sintering process, by the Cr in chromium slag6+It is converted into Cr3+, and
Reach the method for meeting national solid waste discharge standard.
Background technique
The chromium salt factory in China, the leached-out chromium residue of crome metal factory discharge are largely deposited in dew since utility value is little
It.Air storage chromium slag, after rainwater shower, a large amount of hexavalent chromium penetrates into soil, polluted surface water and groundwater,
It also polluted rivers and lake simultaneously, and then harm the crops and aquatic products and people and poultry health；Dust containing Cr VI drifts
Into air, all there is extremely strong carcinogenesis to the respiratory tract of human body, alimentary canal, skin, mucous membrane.Even if to air storage
Chromium slag uses Anti-seeping technology, can not fundamentally solve pollution problem.
In recent years, due to the attention of National Environmental Protection Agency, there is many chromium residue detoxifying technologies, but most of removing toxic substances in China
Technology has used other a large amount of raw materials, and chromium slag only accounts for a small amount of ingredient, and raw materials consumption is big, and removing toxic substances efficiency is lower, and processing cost is high,
It is unfavorable for industrializing large scale processing.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of production energy consumption is low, save the cost, detoxifying effect good utilisation
The method that sintering technology detoxifies to leached-out chromium residue.
The technical solution of the invention is as follows:
A method of detoxified using sintering technology leached-out chromium residue, comprised the concrete steps that:
1, leached-out chromium residue sieves
Chromium slag is sieved, the chromium slag that granularity is 50 mesh -3mm is chosen；
The granularity of chromium slag determines reaction speed, and chromium slag granularity is bigger, and reaction is slower, otherwise granularity is smaller, bed permeability
Difference, coke distribution amount improve, and sintering time extends, and cause the reduction of sintering machine production capacity, therefore need to control 50 mesh -3mm of chromium slag granularity to be advisable；
2, ingredient is mixed
By chromium slag, additive, reducing agent (70-90) in mass ratio: (10-30): 15 ingredients, the additive are water quenching
Slag, reducing agent are coke powder；
Another factor for determining reduction effect is that each components such as chromium slag and Water Quenching Slag, coke powder need to be adequately mixed, to protect
Hold good contact；
Mixture is obtained after batch mixer is sufficiently mixed, and is added water that granularity is made and is the mixture particle of 5mm-8mm, and controls particle
Moisture is 6%-7%；
3, cloth, igniting, sintering
Mixture particle is equably distributed on pallet, guarantees that pallet is paved and be covered with to mixture particle, is burnt
Thickness of feed layer control is tied in 450mm, grate-layer material thickness 80mm；Firing temperature is controlled at 1100 DEG C -1200 DEG C；It is sintered bellows negative pressure
Control is in 12kpa-13kpa；Vertical sintering speed 18mm/min or less；
Reducing agent C, CO are by the Cr in chromium slag in sintering process6+It is reduced to Cr3+, as the temperature rises, reduction rate is fast
Speed rises；Under the high temperature conditions, additive is reacted with chromium slag generates low melting point eutectic, and mixture generates rich at molten condition
Rich liquid phase forms the sinter with some strength after cooling；
Removing toxic substances reaction in chromium slag sintering process:
2C+O2→2CO↑；
2Na2CrO4+3CO→2NaCrO2+Na2CO3+2CO2↑；
2CaCrO4+3CO→Ca(CrO2)2+CaO+3CO2↑；
4Na2CrO4+3C→4NaCrO2+2Na2CO3+CO2↑；
4CaCrO4+3C→2Ca(CrO2)2+2CaO+3CO2↑；
4, cooling
Air blast cooling is carried out to high temperature finished product sinter, storage is made up to and transport requires；
5, it sieves
Sinter after cooling is sieved, one section of sieve sieves lower < 5mm material and is sintered again as cold return mine, two sections of sieves
Grate-layer material of the material of lower 5mm-20mm as cloth when is sieved, being greater than the material of 20mm on sieve is finished product mine, is transported to by belt
Stock ground.
Further, the chromium slag is the industrial residue for having calcium baked for producing crome metal to generate.
Further, the additive is Water Quenching Slag discarded when silicomangan produces.
Further, complicated redox reaction occurs in sintering process, in order to enhance the also Primordial Qi in sintering process
Atmosphere, the main exhauster throttle opening by being sintered bellows control air quantity in 50m3/m2Min hereinafter, back reaction is reduced or avoided,
Make Cr3+Secondary oxidation occurs.
Further, when sintering, the red bed of material control of sinter section is in 150mm or less, it is ensured that mixture is burned, grills thoroughly.
Beneficial effects of the present invention:
Rational technology, production energy consumption is low, save the cost, will be in chromium slag using the high temperature and reducing atmosphere in sintering process
Hexavalent chrome reduction be trivalent chromium, realize the harmless treatment of chromium slag, detoxify high-efficient, sintering process can be by Cr6+Sufficiently also
Original, finished product mineral water soak Cr in sample6+Index is lower than national standard (being less than 5PPm), after outdoor storage 197 days, Cr in sinter6+Leaching
Oxicity analysis index is suitble to industrialization large scale processing also below national standard out.
Detailed description of the invention
Fig. 1 is process flow chart of the invention.
Specific embodiment
Embodiment
1 feed components content table of table
A method of detoxified using sintering technology leached-out chromium residue, comprised the concrete steps that:
1, leached-out chromium residue sieves
As shown in Figure 1, chromium slag (industrial residue for having calcium baked for producing crome metal to generate) is sieved, choosing granularity is
The chromium slag of 50 mesh -3mm；
2, ingredient is mixed
Discarded Water Quenching Slag (ingredient such as table 1), coke powder be in mass ratio when by chromium slag (ingredient such as table 1), silicomangan production
(70-90): (10-30): 15 ingredients；Mixture is obtained after batch mixer is sufficiently mixed, and adds water that the mixing that granularity is 5mm-8mm is made
Expect particle, and controlling pellet moisture is 6%-7%；
3, cloth, igniting, sintering
Mixture particle is equably distributed on pallet, guarantees that pallet is paved and be covered with to mixture particle, is burnt
Thickness of feed layer control is tied in 450mm, grate-layer material thickness 80mm；Firing temperature is controlled at 1100 DEG C -1200 DEG C；It is sintered bellows negative pressure
Control is in 12kpa-13kpa；Vertical sintering speed 18mm/min or less；The red bed of material control of sinter section is in 150mm hereinafter, with true
Guarantor's mixture is burned, grills thoroughly；
Complicated redox reaction occurs in sintering process and passes through burning to enhance the reducing atmosphere in sintering process
The main exhauster throttle opening control air quantity of bellows is tied in 50m3/m2Min makes Cr hereinafter, back reaction is reduced or avoided3+Occur
Secondary oxidation；
4, cooling
Air blast cooling is carried out to high temperature finished product sinter, storage is made up to and transport requires, cooling residual heat can be used as
Hot gas sintering；
5, it sieves
Sinter after cooling is sieved, one section of sieve sieves lower < 5mm material and is sintered again as cold return mine, two sections of sieves
Grate-layer material of the material of lower 5mm-20mm as cloth when is sieved, being greater than the material of 20mm on sieve is finished product sinter, passes through belt
It is transported to stock ground.
Embodiment 1
1, leached-out chromium residue sieves
Chromium slag (industrial residue for having calcium baked for producing crome metal to generate) is sieved, choosing granularity is 50 mesh -3mm's
Chromium slag；
2, ingredient is mixed
Discarded Water Quenching Slag (ingredient such as table 1), coke powder be in mass ratio when by chromium slag (ingredient such as table 1), silicomangan production
80:20:15 ingredient；Mixture is obtained after batch mixer is sufficiently mixed, and adds water that the mixture particle that granularity is 5mm-8mm is made, and
Controlling pellet moisture is 7%；
3, cloth, igniting, sintering
Mixture particle is equably distributed on pallet, guarantees that pallet is paved and be covered with to mixture particle, is burnt
Thickness of feed layer control is tied in 450mm, grate-layer material thickness 80mm；Firing temperature is controlled at 1100 DEG C -1200 DEG C；It is sintered bellows negative pressure
Control is in 13kpa；Vertical sintering speed 18mm/min or less；The red bed of material control of sinter section is in 150mm hereinafter, to ensure to mix
Expect it is burned, grill thoroughly；
Complicated redox reaction occurs in sintering process and passes through burning to enhance the reducing atmosphere in sintering process
The main exhauster throttle opening control air quantity of bellows is tied in 50m3/m2Min makes Cr hereinafter, back reaction is reduced or avoided3+Occur
Secondary oxidation；
4, cooling
Air blast cooling is carried out to high temperature finished product sinter, storage is made up to and transport requires；
5, it sieves
Sinter after cooling is sieved, one section of sieve sieves lower < 5mm material and is sintered again as cold return mine, two sections of sieves
Grate-layer material of the material of lower 5mm-20mm as cloth when is sieved, being greater than the material of 20mm on sieve is finished product sinter, it is detected,
Cr6+Content is 0.004%, Cr6+(Leaching analysis)≤0.05%, is transported to stock ground by belt.
Embodiment 2
1, leached-out chromium residue sieves
As shown in Figure 1, chromium slag (ingredient such as table 1) is sieved, the chromium slag that granularity is 50 mesh -3mm is chosen；
2, ingredient is mixed
Discarded Water Quenching Slag (ingredient such as table 1), coke powder 90:10:15 in mass ratio match when by chromium slag, silicomangan production
Material；Mixture is obtained after batch mixer is sufficiently mixed, and is added water that granularity is made and is the mixture particle of 5mm-8mm, and controls pellet moisture
It is 6.5%；
3, cloth, igniting, sintering
Mixture particle is equably distributed on pallet, guarantees that pallet is paved and be covered with to mixture particle, is burnt
Thickness of feed layer control is tied in 450mm, grate-layer material thickness 80mm；It is lighted a fire using air and electric furnace coal gas, controls firing temperature
At 1100 DEG C -1200 DEG C；Bellows vacuum cavitations are sintered in 12kpa-13kpa；Vertical sintering speed 18mm/min or less；Sintering is disconnected
Flushing bed of material control is in 150mm hereinafter, to ensure that mixture is burned, grills thoroughly；
Complicated redox reaction occurs in sintering process and passes through burning to enhance the reducing atmosphere in sintering process
The main exhauster throttle opening control air quantity of bellows is tied in 50m3/m2Min makes Cr hereinafter, back reaction is reduced or avoided3+Occur
Secondary oxidation；
4, cooling
Air blast cooling is carried out to high temperature finished product sinter, storage is made up to and transport requires, cooling residual heat can be used as
Hot gas sintering heat；
5, it sieves
Sinter after cooling is sieved, one section of sieve sieves lower < 5mm material and is sintered again as cold return mine, two sections of sieves
Grate-layer material of the material of lower 5mm-20mm as cloth when is sieved, being greater than the material of 20mm on sieve is finished product sinter, it is detected,
Cr6+Content is 0.004%, Cr6+(Leaching analysis)≤0.05%, is transported to stock ground by belt.
Embodiment 3
1, leached-out chromium residue sieves
Chromium slag (having calcium roasting) is sieved, the chromium slag that granularity is 50 mesh -3mm is chosen；
2, ingredient is mixed
Discarded Water Quenching Slag, coke powder 70:30:15 ingredient in mass ratio when by chromium slag, silicomangan production；It is filled through batch mixer
Mixture is obtained after dividing mixing, adds water that granularity is made and is the mixture particle of 5mm-8mm, and controlling pellet moisture is 6%；
3, cloth, igniting, sintering
Mixture particle is equably distributed on pallet, guarantees that pallet is paved and be covered with to mixture particle, is burnt
Thickness of feed layer control is tied in 450mm, grate-layer material thickness 80mm；Firing temperature is controlled at 1100 DEG C -1200 DEG C；It is sintered bellows negative pressure
Control is in 12kpa；Vertical sintering speed 18mm/min or less；The red bed of material control of sinter section is in 150mm hereinafter, to ensure to mix
Expect it is burned, grill thoroughly；
Complicated redox reaction occurs in sintering process and passes through burning to enhance the reducing atmosphere in sintering process
The main exhauster throttle opening control air quantity of bellows is tied in 50m3/m2Min makes Cr hereinafter, back reaction is reduced or avoided3+Occur
Secondary oxidation；
4, cooling
Air blast cooling is carried out to high temperature finished product sinter, storage is made up to and transport requires；
5, it sieves
Sinter after cooling is sieved, one section of sieve sieves lower < 5mm material and is sintered again as cold return mine, two sections of sieves
Grate-layer material of the material of lower 5mm-20mm as cloth when is sieved, being greater than the material of 20mm on sieve is finished product sinter, it is detected,
Cr6+Content is 0.004%, Cr6+(Leaching analysis)≤0.05%, is transported to stock ground by belt.
Mixture (chromium slag and Water Quenching Slag) and each component content balance table in sinter in 2 embodiment 3 of table
Chromium slag sinter analyzes data after stacking 197 days outside sinter room in 3 table 2 of table
From table 1, table 2 and 3 data of table it is found that sintering process can be by Cr6+Sufficiently reduction, finished product mineral water soak Cr in sample6+Refer to
Mark is lower than national standard (being less than 5PPm), after outdoor storage 197 days, Cr in sinter6+Leaching analysis indexes are also below state
Family's standard.
The above is only specific embodiments of the present invention, are not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of method detoxified using sintering technology leached-out chromium residue, it is characterized in that:
Specific step is as follows:
1.1, leached-out chromium residue sieves
Chromium slag is sieved, the chromium slag that granularity is 50 mesh -3mm is chosen；
1.2, ingredient is mixed
By screened chromium slag, additive Water Quenching Slag, reducing agent coke powder according to mass ratio (70-90): (10-30): 15 match
Material obtains mixture after batch mixer is sufficiently mixed, and adds water that granularity is made and is the mixture particle of 5mm-8mm, and controls pellet moisture
For 6%-7%；
1.3, cloth, igniting, sintering
Mixture particle is equably distributed on pallet, guarantees that pallet, sintering feed are paved and be covered with to mixture particle
Layer thickness control is in 450mm, grate-layer material thickness 80mm；Firing temperature is controlled at 1100 DEG C -1200 DEG C；It is sintered bellows vacuum cavitations
In 12kpa-13kpa；Vertical sintering speed 18mm/min or less；
1.4, cooling
It is cooling that air blast is carried out to high temperature finished product sinter；
1.5, it sieves
Sinter after cooling is sieved, one section of sieve sieves lower < 5mm material and is sintered again as cold return mine, under two sections of sieve sieves
The grate-layer material when material of 5mm-20mm is as cloth, the material on sieve greater than 20mm are finished product mine.
2. the method detoxified using sintering technology leached-out chromium residue according to weighing and require 1, it is characterized in that: the chromium slag
For the industrial residue for thering is calcium baked for producing crome metal to generate.
3. the method detoxified using sintering technology leached-out chromium residue according to weighing and require 1, it is characterized in that: the addition
Agent is Water Quenching Slag discarded when silicomangan produces.
4. the method detoxified using sintering technology leached-out chromium residue according to weighing and require 1, it is characterized in that: sintering bellows
Main exhauster Boiler pressure control in 50m3/m2·min。
5. the method detoxified using sintering technology leached-out chromium residue according to weighing and require 1, it is characterized in that: when sintering,
The red bed of material control of sinter section is in 150mm or less.
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| CN109943712B (en) * | 2019-04-02 | 2020-10-27 | 青海际华江源实业有限公司 | Chromium mineral powder sintering method and sintering system |
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| CN1059370A (en) * | 1990-08-31 | 1992-03-11 | 黄石市无机盐厂 | Chromium residue detoxifying, smelting contain the method for chromium pig iron |
| CN101265508A (en) * | 2007-03-16 | 2008-09-17 | 天津市大钧科技开发有限公司 | Harmless resource treatment method for chromium slag by using blast furnace iron-making technique |
| CN101264375A (en) * | 2007-03-16 | 2008-09-17 | 天津市大钧科技开发有限公司 | Chromic slag harmlessness comprehensive utilization processed by band sintering machine |
| CN101875987A (en) * | 2009-12-02 | 2010-11-03 | 吐鲁番沈宏金属工业有限责任公司 | Method for smelting low chromium pig iron by utilizing chromium slag |
| CN104907532A (en) * | 2015-05-05 | 2015-09-16 | 重庆大学 | Chromium slag harmlessness processing method by taking tailings and chromium slag as sintering fusing agents after steel slag magnetic separation |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1037917C (en) * | 1993-03-02 | 1998-04-01 | 锦州铁合金厂 | Technique for smelting ferrochrome using powdered Cr ore reductive sintered blocks |
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2016
- 2016-09-19 CN CN201610833401.4A patent/CN106500106B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1059370A (en) * | 1990-08-31 | 1992-03-11 | 黄石市无机盐厂 | Chromium residue detoxifying, smelting contain the method for chromium pig iron |
| CN101265508A (en) * | 2007-03-16 | 2008-09-17 | 天津市大钧科技开发有限公司 | Harmless resource treatment method for chromium slag by using blast furnace iron-making technique |
| CN101264375A (en) * | 2007-03-16 | 2008-09-17 | 天津市大钧科技开发有限公司 | Chromic slag harmlessness comprehensive utilization processed by band sintering machine |
| CN101875987A (en) * | 2009-12-02 | 2010-11-03 | 吐鲁番沈宏金属工业有限责任公司 | Method for smelting low chromium pig iron by utilizing chromium slag |
| CN104907532A (en) * | 2015-05-05 | 2015-09-16 | 重庆大学 | Chromium slag harmlessness processing method by taking tailings and chromium slag as sintering fusing agents after steel slag magnetic separation |
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