CN107937711A - A kind of dedusting ash of stainless steel treatment process - Google Patents
A kind of dedusting ash of stainless steel treatment process Download PDFInfo
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- CN107937711A CN107937711A CN201711218448.0A CN201711218448A CN107937711A CN 107937711 A CN107937711 A CN 107937711A CN 201711218448 A CN201711218448 A CN 201711218448A CN 107937711 A CN107937711 A CN 107937711A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
- C22B1/10—Roasting processes in fluidised form
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/001—Dry processes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/02—Working-up flue dust
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P10/20—Recycling
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Abstract
The present invention relates to a kind of dedusting ash of stainless steel rotary kiln for directly reducing treatment process, tool process is（1）Dedusting ash of stainless steel presses 100 with reduction coal：After 10~20 ratio carries out dispensing and mixing, the granular material that water content is 10~12%, granularity is 3~5mm is made；（2）Granular material is in preheating in rotary kiln band after drying and preheating, enter reduction of the high temperature reduction band through 1100~1200 DEG C of temperature, 90~120min of time, and high volatile beans and the hydrocarbon joint reduction of high-grade grain ore deposit progress and carbon cycle oxygenation reduction are sprayed into rotary kiln in the dedusting ash reduction middle and later periods, dedusting ash of stainless steel can be made sufficiently to be reduced in rotary kiln；（3）High-temperature roasting material after kiln discharge can obtain power supply stove or the granulated metal product that converter utilizes after supercooling, magnetic separation.The present invention is effectively utilized iron, nickel and chromium resource in dirt mud while iron and steel enterprise's dedusting ash of stainless steel is handled, and produces nickeliferous and chromium high-quality metallization material.
Description
Technical field
The invention belongs to metallurgical and mineral engineering technology field, it is related to a kind of rotary kiln for directly reducing of dedusting ash of stainless steel
Treatment process.
Background technology
Dedusting ash of stainless steel is the fine grained stove dirt carried out by coal gas of converter during stainless steel-making, it is added by converter
Pan feeding powder and the microparticle composition produced in high-temperature region intense reaction, dedusting ash particle are essentially spherical.Stainless steel dedusting
Ash particle is small, density is small, is easily drifted after drying in air, is easily formed complicated component, harm to the human body in atmosphere
Larger floating dust.
Main thing is mutually metallic iron and the oxide of chromium in dedusting ash of stainless steel, and wherein iron is with Fe2O3And Fe3O4Form
In the presence of chromium is with CrO and FeCr2O4Form exist, the existence form of nickel be NiO, and at the same time with manganese formation complex oxide and with
NiMn2O4And MnNi2O4Form exist.
At present, the method for processing dedusting ash of stainless steel substantially has three kinds both at home and abroad：（1）Directly outer row's stockpiling.Due to stainless
Dedusting ash yield is larger in steel production, long-term stockpiling not only land occupation, influence environment, and wherein substantial amounts of iron, chromium, nickel
Do not recycled etc. resource, cause the waste of resource；（2）Return to sintering or pelletizing dispensing directly utilizes, by domestic many steel
Iron enterprise uses, but since the Iron grade of dedusting ash of stainless steel only has 35% or so, Cr, Ni, Zn equal size are higher, supplying sintering
When ore deposit or pellet utilize, the capacity factor of a blast furnace can be reduced, coke ratio rise, the life of the blast furnace is affected, while can cause expensive
The loss of heavy element Cr, Ni；（3）Add converter to be utilized, dedusting ash of stainless steel is cold with carrying out cold-pressing balls after binder formulation
Pressure ball adds converter and is utilized.Since cold-pressing balls Iron grade is relatively low, metal Ferrum content is very low, added as steel-making auxiliary material
Into converter, though part lime, fluorite and the iron scale in solvent can be replaced, the metals such as iron member is recycled directly from dedusting ash
Element, reduces production cost, reduces the pollution to environment, but the dedusting ash proportion of utilization for adding converter is relatively low, less economical, environmentally friendly
It is not up to standard, it is impossible to meet dedusting ash all of needs；（4）Comprehensive reutilization, using direct reduction process from dedusting ash
The middle extraction valuable element such as iron and chromium, nickel.
At present, the technique of valuable element mainly has rotary hearth furnace process and revolution firer in comprehensive utilization dedusting ash both at home and abroad
Skill.（1）Rotary hearth furnace process is the maturation process technology of current domestic a small number of steel plant's processing Zinc-Bearing Wastes, the direct-reduction technique
There is certain advantage for handling the materials containing zinc-iron such as steel plant's blast furnace gas plaster.But the shortcomings that there is also being difficult to overcome,
As project construction is invested, big, the material reduction bed of material is thin, resultant metal rate is low, efficiency of energy utilization is not high, greatly limits
Its promotion and application in steel industry.（2）Rotary kiln technology is current domestic most steel plant（Such as Wuhan Iron and Steel Plant, this steel, duckweed steel
With Xinyu steel mill etc.）The maturation process technology of Zinc-Bearing Wastes is handled, which has concise in technology, project investment
It is small, production run cost is low（It is not required to outsourcing gaseous fuel）The advantages that, for handling the things containing zinc-iron such as steel plant's carbon steel dedusting ash
Material has certain advantage, but there is reduction temperature is higher, metal time when rotary kiln technology is used for handling dedusting ash of stainless steel
The problems such as yield is relatively low.In addition, when reducing material uses ore grinding and magnetic separation process, the chromated oxide contained in sewage is easily made
Into the pollution of environment, the difficulty of sewage disposal is caused, is subject to certain restrictions its popularization and application.
This project is by the technical study to existing rotary kiln processing dedusting ash of stainless steel, for existing for rotary kiln production
A kind of problem, it is proposed that the rotary kiln for directly reducing treatment process of dedusting ash of stainless steel.
The content of the invention
The technical problems to be solved by the invention are provided a kind of high using rotary kiln the shortcomings that being directed in the prior art
The treatment process of the method recycling dedusting ash of stainless steel valuable element of temperature reduction.
Adopted the following technical scheme that to solve the technical problem of the present invention：
A kind of dedusting ash of stainless steel treatment process, comprises the following steps that：
（1）Dedusting ash of stainless steel is with reduction coal by weight 100：After 10-20 carries out dispensing and mixing, it is made and is containing water quality
10-12%, the granular material that granularity is 3-5mm；
（2）Granular material after drying and preheating, enters the reduction of high temperature reduction band, reduction temperature in preheating in rotary kiln band
For 1100-1200 DEG C, recovery time 90-120min, into rotary kiln while sprayed when mixed material reverts to 50-70min
The high volatile beans for entering to account for granular material quality 10-15% and the high-grade grain ore deposit for accounting for granular material quality 15-20% carry out carbon
The reduction of hydrogen joint and carbon cycle oxygenation reduction terminate until reacting, and dedusting ash of stainless steel is fully reduced in rotary kiln；
（3）High temperature reduction material is entered in air indirect cooler after the discharge of rotary kiln discharge end, reducing material temperature drop
It is low to less than 400 DEG C when enter water indirect cooler, reducing material temperature is reduced to less than 200 DEG C from water indirect cooler
Discharge, the normal temperature air that air blower blasts are carried out for rotary kiln when temperature is increased to 500-550 DEG C in air indirect cooler
Utilize；
（4）Roasting material after magnetic field intensity 1000-2000 Oe dry type magnetic separations, is divided into magnetic metallization in magnetic separator
Product and not magnetic non-magnetic material, metallized product are utilized for stainless steel electric furnace or converter, and non-magnetic material is through 1-2mm
It is divided into granular carbon residue and coal ash after vibrating screen screening；
（5）Entered from 600-700 DEG C of high-temperature flue gas of rotary kiln feeding end discharge in gravity settling chamber, with flue gas flow rate
Reduce, large dust particle settles aggregation under the effect of gravity in flue gas, mineral grain is deposited on expansion chamber bottom；
（6）The high-temperature flue gas containing dust come out from gravity settling chamber is sent in U-tube shape air/water cooler, in U-shaped disk
Under the indirect cooling effect for managing multiple flow-disturbing and air and water, dust particles start to grow up by colliding and adsorbing in flue gas, glue
The large granular materials that knot is formed are deposited on U-tube shape air/water cooler bottom under the effect of gravity, and temperature is reduced to less than 250 DEG C
Flue gas from U-tube shape air/water cooler discharge；
（7）Low-temperature flue gas after cooling is discharged after bag filter dedusting, then through smoke extractor pressurization.
The step（4）In granular carbon residue account for mass fraction 80%, returning charge conduct to -200 mesh by ball mill is levigate
The reduction coal that dedusting ash of stainless steel is incorporated when pelletizing is utilized.
The step（2）Middle high volatile beans granularity is 5-20mm.
The step（2）Middle high-grade bloodstone granularity is 1-10mm.
High volatile beans spray gun is set in rotary kiln end, high volatile beans spray gun arrives high volatile granular coal injection
At 1/4-1/5 away from kiln hood outlet for rotary kiln length.
High-grade bloodstone spray gun is set in rotary kiln end, high-grade bloodstone spray gun arrives the injection of high-grade bloodstone
At 1/4-1/5 away from kiln hood outlet for rotary kiln length.
7th, a kind of dedusting ash of stainless steel treatment process according to claim 1 or 6, it is characterised in that：The step
（1）Middle granulation uses drum pelletizer or disk pelletizing mechanism grain.
Dedusting ash of stainless steel：Iron grade is 33-38%, SiO2Mass content 5-7%, Cr2O3Mass content 10-17%, Ni matter
Measure content 1-2%.
High volatile beans：Fixed carbon mass content is 44-46%, ash content mass content is 7-9%, volatile matter mass content
For 47-49%；High-grade bloodstone：Iron grade is more than 45%.
Its general principles are：（1）The fusing point of dedusting ash of stainless steel is generally 1593~1675K, and nickel is very in dedusting ash
Easily reduction, is secondly iron, and the more difficult reduction of chromium, and the reduction of lead, zinc oxide is accompanied by reduction process.Therefore, exist
During alloy smelting, carbon reducing iron oxides first, then carbon restore NiO, Cr2O3Deng metal oxide.（2）Primary chemical is anti-
Should：1. the reduction of nickel element：At 750 DEG C, NiO is substantially reduced, i.e., can be reduced sufficiently in melting nickel at initial stage.In 900-1100
DEG C when, the reduction reaction of Ni carries out very abundant.Nickel can form continuous solid solution [Ni]+[Fe]=[Ni] Fe with iron, and in liquid
Two kinds of elements have unlimited mutual fusibleness in state.Therefore, Ni elements can be reduced fully in stove in dedusting ash of stainless steel, its reduction rate can
Up to more than 93%.2. the reduction of ferro element.Iron in dedusting ash of stainless steel is mainly with Fe2O3Form exists.In certain reducing condition
Under, the reduction sequence of iron is Fe2O3→FeO→Fe.Since 450 DEG C, Fe is carried out2O3+3CO=2FeO+3CO2Reaction, temperature liter
Height is to 911 DEG C, the iron restored and nickel composition Ni-Fe and chromium composition ferrochrome binary carbide [(Cr.Fe)3C].3. chromium
Reduction：In high temperature furnace in reduction with carbon dedusting ash of stainless steel chromium oxide Cr2O3, it reduces generation Cr3O2Start temperature
For l300 DEG C, reduction generation Cr7C3The temperature that reaction starts is l130 DEG C, reduction generation Cr3C6The temperature of beginning is 1175 DEG C,
The temperature of reduction generation chromium is 1250 DEG C.Simultaneously as chromium and the mutual phased soln of iron, make reduction reaction be more easy to carry out.
The present invention takes and is sprayed into the dedusting ash reduction middle and later periods into rotary kiln to improve the degree of metalization of metallized product
The hydrocarbon joint of high volatile beans and high-grade bloodstone reduces and carbon cycle oxygenation direct reduction process.When dedusting ash is being returned
When reduction proceeds to the middle and later periods in rotary kiln, carbon content and ferriferous oxide oxygen content are reduced in mixed material, reducing gas and iron oxygen
Compound contact area reduces, and material interior atmosphere concentration is relatively low, makes the reduction reaction speed of dedusting ash reduce.It is mixed to improve
The reducing atmosphere concentration of compound material reduction reaction middle and later periods, when taking from rotary kiln kiln discharge end penetrating 5-0mm beans, beans is waved
The H put out2It is dense that the CO released with CO and beans gasification reaction can improve mixed material reduction reaction middle and later periods reducing atmosphere
Degree, so as to improve the reduction rate of dedusting ash roasting middle and later periods.It is but high when making oxygenation agent using 1-10mm high-grade bloodstone
After grade bloodstone is injected in rotary kiln from kiln discharge end, its reduction reaction releases substantial amounts of CO2Gas can accelerate mixed material
Middle gasification reaction speed, makes gasification reaction generate more CO, so as to accelerate the reduction reaction speed of dedusting ash, and makes to remove
Ferriferous oxide in dirt ash is sufficiently reduced.
To reduce the Dust Capacity produced in dedusting ash of stainless steel rotary kiln reduction process, the method taken has the present invention：（1）
Pelletize before being roasted to dedusting ash of stainless steel；（2）Enter the method for kiln roasting using aqueous granular material, granular material can be done
The moisture discharged during dry is entered in flue gas, adds the humidity of flue gas, so as to promote in flue gas between subparticle
Absorption and agglomeration；（3）Using U-tube shape air/water cooler, the flow distance of flue gas is extended, enhances flow of flue gas mistake
Disturbance in journey, can make molecule in flue gas sufficiently be collided and its bonding absorption and reunion is grown up.
The present invention is in revolution kilning kiln and temperature-rise period, using the coal gas being passed through from kiln discharge end（Or coal dust）With air blower
The combustion air blasted carries out burning and provides heat.When kiln temperature is increased to more than 700 DEG C, charcoal in mixed material and
The beans of penetrating proceeds by gasification reaction, and a part of fuel gas is provided into rotary kiln, this part fuel gas with
Burn after the air mixing that kiln hood blasts, a part of heat can be provided into kiln.When kiln temperature is increased to 800 DEG C
During the above, charcoal and the beans of penetrating carry out fierce gasification reaction in mixed material, and gasification reaction is released substantial amounts of flammable
Gas, can meet the heat needs that dedusting ash is reduced directly in kiln, can stop the coal gas being passed through from rotary kiln kiln discharge end at this time, turn
And spray into the reinforcing of beans and high-grade bloodstone progress dedusting ash reduction process.
Kiln body is divided into three bands, is counted from feed end, first band by the present invention according to material situation in kiln：Granular material
Drying and reduction, and reduction process in dusting；Second band：The granulation of dusting material, this-band to dusting material into
Row high temperature is granulated, granule size generally >=3mm accounts for more than 70%；3rd band：It is granulated the consolidation of material.Material is granulated in high temperature
In roasting process, crystal grain is further grown up and is linked in flakes, while a small amount of liquid phase is produced inside material, is put forward its intensity
It is high.
The present invention can reach following effect by a kind of implementation of dedusting ash of stainless steel rotary kiln for directly reducing treatment process
Fruit：1st, the higher metallization material of degree of metalization is gone out using direct-reduction technique productions to dedusting ash of stainless steel, reducing material is again
Return to stainless steel electric furnace or converter is utilized, realize the efficient utilization of dedusting ash of stainless steel and whole recycling of valuable metal.
2nd, dedusting ash of stainless steel reduces, carbon cycle oxygenation Direct Reduction Technology in rotary kiln reduction process by using hydrocarbon joint,
Not only reduce reduction temperature and shorten the recovery time, and produce high-quality metallization material.3rd, dedusting ash of stainless steel exists
In Direct Reduction, pelletize by using powder, wet feed enters kiln technology, production process meets environmental requirement.
Brief description of the drawings
Fig. 1 is present invention process flow chart.
Embodiment
Embodiment 1
A kind of dedusting ash of stainless steel treatment process, concrete technology are as follows：
1st, the selection of material
Dedusting ash of stainless steel：Iron grade is 33%, SiO2Mass content 7%, Cr2O3Mass content 10%, Ni mass contents 1%.
High volatile beans：Fixed carbon mass content is 44%, ash content mass content is 9%, volatile matter mass content is
49%th, granularity 20mm.
High-grade bloodstone：Iron grade is 45%, granularity 1mm.
2nd, material pelletization
Dedusting ash of stainless steel presses 100 with reduction coal：After 10 mass ratio carries out dispensing and mixing, it is made of disk pelletizing machine
Containing the granular material that water quality is 12%, granularity is 3mm, reduction coal is accounted for using the carbon residue that rotary kiln returns through being milled down to 200 mesh
More than 40% powder
3rd, reduction, dusting and the pelletizing of granular material
Added containing the granular material that water quality is 12% from the feeding end of rotary kiln, granular material is in preheating in rotary kiln band
After drying and preheating, in rotary kiln high temperature reduction band by controlling 1200 DEG C of granular material reduction temperature, time 120min, when
When mixed material reverts to 70min into rotary kiln it is lasting at the same time spray into the high volatile beans that accounts for granular material quality 10% and
The hydrocarbon joint reduction of high-grade grain ore deposit progress and carbon cycle oxygenation reduction for accounting for granular material quality 15% terminate until reacting, and mix
For compound material in rotary kiln during gasification reaction and reduction of iron ore, granular material carries out dusting, and dusting iron ore is returning
During rotary kiln High Temperature Rotating, and it is bonded to spherical material.
The present invention realizes the reduction of hydrocarbon joint and the carbon cycle oxygenation restoring method of dedusting ash reduction reaction middle and later periods：（1）
Rotary kiln end set beans spray gun, by granularity be 20mm high volatile coals injection arrive away from kiln hood export be what rotary kiln was grown
At 1/4.It is rotary kiln length 1/4 everywhere in the posterior segment of high temperature reduction band in kiln away from kiln hood outlet, herein in mixed material
Carbon largely consumed, reducing atmosphere is weaker in the bed of material, after being thrown into high volatile beans, the C and residual in height volatilization beans
C and the CO of generation in the bed of material in charcoal2Generation gasification reaction releases CO, enhances the reducing atmosphere in the bed of material, improves
Kinetics of reduction condition, improves reduction reaction speed.Meanwhile the high volatile beans of kiln is blown into kiln under high temperature
Volatile matter is released, the CH in volatile matter4, tar, benzene, the combustible such as naphthalene burn in rotary kiln as heating fuel, volatile matter
In H2Using the ferriferous oxide reduced as reducing agent in the bed of material, it can be achieved that dedusting ash is in reduction temperature early period when through the bed of material
With H during less than 800 DEG C2Based on reduction, reduced when reducing middle and later periods temperature and being higher than 800 DEG C with CO based on.（2）In rotary kiln
Head sets grain ore deposit spray gun, and it is at the 1/4 of rotary kiln length that the high-grade grain ore deposit that granularity is 1mm, which is blown to being exported away from kiln hood,.Away from
Kiln hood outlet is rotary kiln length 1/4 everywhere in the posterior segment of high temperature reduction band in kiln, herein the big portion of the carbon in mixed material
Divide and consumed, reducing atmosphere is weaker in the bed of material.After grain ore deposit sprays into, in kiln under high temperature action, the iron oxygen in high-grade grain ore deposit
Compound occurs reduction reaction with the CO in the bed of material and releases CO2, CO2As " oxygenation agent " with spraying into the C in the high volatilization beans in kiln
Generation gasification reaction releases CO, strengthens the reducing atmosphere in the bed of material, improves kinetics of reduction condition, and it is anti-to improve reduction
Answer speed.
4th, material cooling is roasted
High temperature reduction material is entered in air indirect cooler after the discharge of rotary kiln discharge end, and reducing material temperature is reduced to
Water indirect cooler is entered at less than 400 DEG C, reducing material temperature is reduced to less than 200 DEG C and is arranged from water indirect cooler
Go out.Normal temperature air is utilized for rotary kiln when temperature is increased to 550 DEG C in air indirect cooler.
5th, material magnetic separation and classification are roasted
Material is roasted in magnetic separator after 2000 Oe dry type magnetic separations of magnetic field intensity, be divided into magnetic metallized product and not
Magnetic non-magnetic material, metallized product are utilized for stainless steel electric furnace or converter, and non-magnetic material is through 1mm Vibration Screens
Granular carbon residue and coal ash can be divided into after point, granular carbon residue accounts for mass fraction 80% by levigate extremely -200 mesh of ball mill, can returning charge work
Utilized for reduction coal.
6th, entered from 700 DEG C of high-temperature flue gas of rotary kiln feeding end discharge in gravity settling chamber, with flue gas flow rate
Reduce, large dust particle settles aggregation under the effect of gravity in flue gas, and most of mineral grain can be made to be deposited on gravity settling chamber
Bottom.
7th, the high-temperature flue gas containing a small amount of dust come out from gravity settling chamber is sent in U-tube shape air/water cooler,
Under the indirect cooling effect of the multiple flow-disturbing and air and water of U-shaped coil pipe, dust particles are by colliding and adsorbing out in flue gas
Beginning grows up, and bonds the large granular materials formed and is deposited on U-tube shape air/water cooler bottom under the effect of gravity, from U-tube shape
The flue-gas temperature of air/water cooler discharge is reduced to less than 250 DEG C.
8th, the low-temperature flue gas after cooling down is discharged after bag filter dedusting, then through smoke extractor pressurization.
Embodiment 2
A kind of dedusting ash of stainless steel treatment process, concrete technology are as follows：
1st, the selection of material
Dedusting ash of stainless steel：Iron grade is 38%, SiO2Mass content 5%, Cr2O3Mass content 17%, Ni mass contents 2%.
High volatile beans：Fixed carbon mass content is 46%, content of ashes 7%, volatile matter mass content are 47%, grain
Spend for 5mm.
High-grade bloodstone：Iron grade is 47%, granularity 10mm.
2nd, material pelletization
Dedusting ash of stainless steel presses 100 with reduction coal：After 20 mass ratio carries out dispensing and mixing, it is made of drum pelletizer
The granular material that water content quality is 10%, granularity is 5mm, the carbon residue that reduction coal is returned using rotary kiln is through being milled down to 200 mesh
Account for more than 40% powder.
3rd, reduction, dusting and the pelletizing of granular material
Added containing the granular material that water quality is 12% from the feeding end of rotary kiln, granular material is in preheating in rotary kiln band
After drying and preheating, in rotary kiln high temperature reduction band by controlling 1100 DEG C of granular material reduction temperature, time 90min, when
When mixed material reverts to 70min into rotary kiln it is lasting at the same time spray into the high volatile beans that accounts for granular material quality 15% and
The hydrocarbon joint reduction of high-grade grain ore deposit progress and carbon cycle oxygenation reduction for accounting for granular material quality 20% terminate until reacting, and mix
For compound material in rotary kiln during gasification reaction and reduction of iron ore, granular material carries out dusting, and dusting iron ore is returning
During rotary kiln High Temperature Rotating, and it is bonded to spherical material.
The present invention realizes the reduction of hydrocarbon joint and the carbon cycle oxygenation restoring method of dedusting ash reduction reaction middle and later periods：（1）
Rotary kiln end set beans spray gun, by granularity be 5mm high volatile coals injection arrive away from kiln hood export be what rotary kiln was grown
At 1/5.It is rotary kiln length 1/5 everywhere in the posterior segment of high temperature reduction band in kiln away from kiln hood outlet, herein in mixed material
Carbon largely consumed, reducing atmosphere is weaker in the bed of material, after being thrown into high volatile beans, the C and residual in height volatilization beans
C and the CO of generation in the bed of material in charcoal2Generation gasification reaction releases CO, enhances the reducing atmosphere in the bed of material, improves
Kinetics of reduction condition, improves reduction reaction speed.Meanwhile the high volatile beans of kiln is blown into kiln under high temperature
Volatile matter is released, the CH in volatile matter4, tar, benzene, the combustible such as naphthalene burn in rotary kiln as heating fuel, volatile matter
In H2Using the ferriferous oxide reduced as reducing agent in the bed of material, it can be achieved that dedusting ash is in reduction temperature early period when through the bed of material
With H during less than 800 DEG C2Based on reduction, reduced when reducing middle and later periods temperature and being higher than 800 DEG C with CO based on.（2）In rotary kiln
Head sets grain ore deposit spray gun, and it is at the 1/5 of rotary kiln length that the high-grade grain ore deposit that granularity is 10mm, which is blown to being exported away from kiln hood,.Away from
Kiln hood outlet is rotary kiln length 1/5 everywhere in the posterior segment of high temperature reduction band in kiln, herein the big portion of the carbon in mixed material
Divide and consumed, reducing atmosphere is weaker in the bed of material.After grain ore deposit sprays into, in kiln under high temperature action, the iron oxygen in high-grade grain ore deposit
Compound occurs reduction reaction with the CO in the bed of material and releases CO2, CO2As " oxygenation agent " with spraying into the C in the high volatilization beans in kiln
Generation gasification reaction releases CO, strengthens the reducing atmosphere in the bed of material, improves kinetics of reduction condition, and it is anti-to improve reduction
Answer speed.
4th, material cooling is roasted
High temperature reduction material is entered in air indirect cooler after the discharge of rotary kiln discharge end, and reducing material temperature is reduced to
Water indirect cooler is entered at less than 400 DEG C, reducing material temperature is reduced to less than 200 DEG C and is arranged from water indirect cooler
Go out.Normal temperature air is utilized for rotary kiln when temperature is increased to 500 DEG C in air indirect cooler.
5th, material magnetic separation and classification are roasted
Roast material in magnetic separator after magnetic field intensity 1000Oe dry type magnetic separations, be divided into magnetic metallized product and without
Magnetic non-magnetic material, metallized product are utilized for stainless steel electric furnace or converter, and non-magnetic material is sieved through 2mm vibrating screens
After can be divided into granular carbon residue and coal ash, granular carbon residue accounts for mass fraction 80% to -200 mesh by ball mill is levigate, can returning charge conduct
Reduction coal is utilized.
6th, entered from 600 DEG C of high-temperature flue gas of rotary kiln feeding end discharge in gravity settling chamber, with flue gas flow rate
Reduce, large dust particle settles aggregation under the effect of gravity in flue gas, and most of mineral grain can be made to be deposited on gravity settling chamber
Bottom.
7th, the high-temperature flue gas containing a small amount of dust come out from gravity settling chamber is sent in U-tube shape air/water cooler,
Under the indirect cooling effect of the multiple flow-disturbing and air and water of U-shaped coil pipe, dust particles are by colliding and adsorbing out in flue gas
Beginning grows up, and bonds the large granular materials formed and is deposited on U-tube shape air/water cooler bottom under the effect of gravity, from U-tube shape
The flue-gas temperature of air/water cooler discharge is reduced to less than 250 DEG C.
8th, the low-temperature flue gas after cooling down is discharged after bag filter dedusting, then through smoke extractor pressurization.
Claims (9)
1. a kind of dedusting ash of stainless steel treatment process, it is characterised in that comprise the following steps that：
（1）Dedusting ash of stainless steel is with reduction coal by weight 100：After 10-20 carries out dispensing and mixing, it is made and is containing water quality
10-12%, the granular material that granularity is 3-5mm；
（2）Granular material after drying and preheating, enters the reduction of high temperature reduction band, reduction temperature in preheating in rotary kiln band
For 1100-1200 DEG C, recovery time 90-120min, into rotary kiln while sprayed when mixed material reverts to 50-70min
The high volatile beans for entering to account for granular material quality 10-15% and the high-grade grain ore deposit for accounting for granular material quality 15-20% carry out carbon
The reduction of hydrogen joint and carbon cycle oxygenation reduction terminate until reacting, and dedusting ash of stainless steel is fully reduced in rotary kiln；
（3）High temperature reduction material is entered in air indirect cooler after the discharge of rotary kiln discharge end, reducing material temperature drop
It is low to less than 400 DEG C when enter water indirect cooler, reducing material temperature is reduced to less than 200 DEG C from water indirect cooler
Discharge, the normal temperature air that air blower blasts are carried out for rotary kiln when temperature is increased to 500-550 DEG C in air indirect cooler
Utilize；
（4）Roasting material after magnetic field intensity 1000-2000 Oe dry type magnetic separations, is divided into magnetic metallization in magnetic separator
Product and not magnetic non-magnetic material, metallized product are utilized for stainless steel electric furnace or converter, and non-magnetic material is through 1-2mm
It is divided into granular carbon residue and coal ash after vibrating screen screening；
（5）Entered from 600-700 DEG C of high-temperature flue gas of rotary kiln feeding end discharge in gravity settling chamber, with flue gas flow rate
Reduce, large dust particle settles aggregation under the effect of gravity in flue gas, mineral grain is deposited on expansion chamber bottom；
（6）The high-temperature flue gas containing dust come out from gravity settling chamber is sent in U-tube shape air/water cooler, in U-shaped disk
Under the indirect cooling effect for managing multiple flow-disturbing and air and water, dust particles start to grow up by colliding and adsorbing in flue gas, glue
The large granular materials that knot is formed are deposited on U-tube shape air/water cooler bottom under the effect of gravity, and temperature is reduced to less than 250 DEG C
Flue gas from U-tube shape air/water cooler discharge；
（7）Low-temperature flue gas after cooling is discharged after bag filter dedusting, then through smoke extractor pressurization.
A kind of 2. dedusting ash of stainless steel treatment process according to claim 1, it is characterised in that：The step（4）In
Granular carbon residue accounts for mass fraction 80% by levigate extremely -200 mesh of ball mill, what returning charge was incorporated when pelletizing as dedusting ash of stainless steel
Reduction coal is utilized.
A kind of 3. dedusting ash of stainless steel treatment process according to claim 1 or 2, it is characterised in that：The step（2）
Middle high volatile beans granularity is 5-20mm.
A kind of 4. dedusting ash of stainless steel treatment process according to claim 3, it is characterised in that：The step（2）Middle height
Grade bloodstone granularity is 1-10mm.
A kind of 5. dedusting ash of stainless steel treatment process according to claim 1 or 4, it is characterised in that：In rotary kiln end
High volatile beans spray gun is set, and high volatile granular coal injection is rotary kiln to being exported away from kiln hood by high volatile beans spray gun
At long 1/4-1/5.
A kind of 6. dedusting ash of stainless steel treatment process according to claim 5, it is characterised in that：Set in rotary kiln end
The injection of high-grade bloodstone is arrived what is grown away from kiln hood outlet for rotary kiln by high-grade bloodstone spray gun, high-grade bloodstone spray gun
At 1/4-1/5.
A kind of 7. dedusting ash of stainless steel treatment process according to claim 1 or 6, it is characterised in that：The step（1）In
Granulation uses drum pelletizer or disk pelletizing mechanism grain.
A kind of 8. dedusting ash of stainless steel treatment process according to claim 1, it is characterised in that：Dedusting ash of stainless steel：Iron
Grade is 33-38%, SiO2Mass content 5-7%, Cr2O3Mass content 10-17%, Ni mass content 1-2%.
A kind of 9. dedusting ash of stainless steel treatment process according to claim 1 or 8, it is characterised in that：High volatile beans：
Fixed carbon mass content is 44-46%, ash content mass content is 7-9%, volatile matter mass content is 47-49%；The red iron of high-grade
Ore deposit：Iron grade is more than 45%.
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| CN108823349A (en) * | 2018-06-15 | 2018-11-16 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of method of dedusting ash of stainless steel classified use |
| CN110195156A (en) * | 2019-06-14 | 2019-09-03 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of iron ore rotary kiln coal base hydrogen metallurgical technology and its device |
| CN110205431A (en) * | 2019-06-04 | 2019-09-06 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Rotary kiln coal-based direct reduction oxygenation is molten to divide furnace short route molten iron making processes |
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| CN108823349A (en) * | 2018-06-15 | 2018-11-16 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of method of dedusting ash of stainless steel classified use |
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| CN110724785A (en) * | 2019-10-18 | 2020-01-24 | 甘肃酒钢集团宏兴钢铁股份有限公司 | System and method for spraying stainless steel dedusting ash to bottom of dephosphorization converter |
| CN111763792A (en) * | 2020-07-08 | 2020-10-13 | 酒泉钢铁(集团)有限责任公司 | Stainless steel dedusting ash rotary hearth furnace-electric furnace reduction treatment process |
| CN113174483A (en) * | 2021-03-31 | 2021-07-27 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for recycling stainless steel nickel and chromium dust |
| CN113122727A (en) * | 2021-04-22 | 2021-07-16 | 鑫联环保科技股份有限公司 | Method for treating iron and steel smoke dust |
| CN113528806A (en) * | 2021-06-24 | 2021-10-22 | 赛能杰高新技术股份有限公司 | Direct reduction treatment process for zinc-containing dust and sludge in iron and steel plant by using high-efficiency rotary hearth furnace |
| CN114717423A (en) * | 2022-04-25 | 2022-07-08 | 酒泉钢铁(集团)有限责任公司 | High-temperature treatment process for stainless steel dedusting ash coal-based hydrogen metallurgy rotary kiln |
| CN114752763A (en) * | 2022-04-25 | 2022-07-15 | 酒泉钢铁(集团)有限责任公司 | Low-temperature treatment process for stainless steel dedusting ash coal-based hydrogen metallurgy rotary kiln |
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