CN110205431A - Rotary kiln coal-based direct reduction oxygenation is molten to divide furnace short route molten iron making processes - Google Patents
Rotary kiln coal-based direct reduction oxygenation is molten to divide furnace short route molten iron making processes Download PDFInfo
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- CN110205431A CN110205431A CN201910483436.3A CN201910483436A CN110205431A CN 110205431 A CN110205431 A CN 110205431A CN 201910483436 A CN201910483436 A CN 201910483436A CN 110205431 A CN110205431 A CN 110205431A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0073—Selection or treatment of the reducing gases
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/08—Making spongy iron or liquid steel, by direct processes in rotary furnaces
- C21B13/085—Making spongy iron or liquid steel, by direct processes in rotary furnaces wherein iron or steel is obtained in a molten state
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
- C21B2100/62—Energy conversion other than by heat exchange, e.g. by use of exhaust gas in energy production
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
- C21B2100/66—Heat exchange
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The present invention relates to metallurgy and mineral engineering technology fields; it discloses rotary kiln coal-based direct reduction oxygenation and melts and divide furnace short route molten iron making processes; the technique is the following steps are included: step 1: after iron ore concentrate and binder are carried out ingredient and mixing in the ratio of 100:2~4; it uses drum pelletizer that the granular material that water content is 3~5mm for 10~12%, granularity is made, while being incorporated the various dedusting ash generated in production process in pelletization；Step 2: granular material is added in rotary kiln, and in preheating in rotary kiln band after drying and preheating, when temperature reaches 400-450 DEG C, iron ore starts to carry out reduction reaction with carbon.Environmental pollution can be greatly reduced in the present invention, it is hardly siliceous in molten iron, it is very suitable to smelt high phosphorus ore, a kind of less, more succinct, energy-saving and environment-friendly novel process of Ferrous Metallurgy of emission is started, with the environmental emission pressure of mitigation " blast furnace-converter " Ferrous Metallurgy process, and there is apparent cost advantage.
Description
Technical field
It is melted the present invention relates to metallurgy and mineral engineering technology field more particularly to rotary kiln coal-based direct reduction oxygenation and divides furnace
Short route molten iron making processes.
Background technique
" blast furnace-converter " process is the most important Ferrous Metallurgy technique in the current whole world, and the technique is first using coke as also
The energy and reducing agent needed for original is reacted carry out reduction iron production to iron oxide ore, then blast-melted are added to converter for what is obtained
Middle oxygen furnace steel.
Currently, coal chemical industry and metallurgical two processes are mutually indepedent, sintering in traditional blast furnace-coking-sintered ironmaking process
Smoke-dust, SO2,6 one-tenth or more of DS NOx Est Liang Zhan integrated iron and steel works total emission volumn；Coke oven discharges of the coke, quenching process has a large amount of cigarettes
Dust emission, discharge amount account for 3 one-tenth or more of integrated iron and steel works' total emission volumn, are sintered, the pollutant discharge amount of coking accounts for steel
More than half of integrated complex's total emission volumn, the two are maximum pollution sources in Steel Production Flow Chart.
Smelting and rducing iron ores technology is one of contemporary steel and iron industry cutting edge technology, refers to now and is reduced directly with mill coal
The technique for generating liquid molten iron, smelting reduction technology includes Corex method, FINEX method and HIsmelt method.
Above two method has the drawback that ring formation of rotary kiln, production capacity are low, energy consumption is high in the actual operation process,
The problems such as raw material prereduction degree is low, preheating temperature is low, it is therefore desirable to improve.
Summary of the invention
The purpose of the present invention is to solve the problems such as ring formation of rotary kiln, production capacity are low, energy consumption is high exists in the prior art, with
And the disadvantage that raw material prereduction degree is low in reducing process, preheating temperature is low, and the rotary kiln coal-based direct reduction proposed increases
Oxygen is molten to divide furnace short route molten iron making processes.
To achieve the goals above, present invention employs following technical solutions:
Rotary kiln coal-based direct reduction oxygenation is molten to divide furnace short route molten iron making processes, which is characterized in that the technique include with
Lower step:
Step 1: after the ratio that iron ore concentrate and binder are 100:2~4 in mass ratio is carried out ingredient and mixing, using cylinder
The granular material that aqueous mass ratio is 10~12%, granularity is 3~5mm is made in granulator, while production is incorporated in pelletization
The dedusting ash generated in the process；
Step 2: the granular material is added in rotary kiln, by preheating, the preheating temperature in preheating in rotary kiln band
Be 400-450 DEG C, after preheating time is 4-5min, iron ore starts to carry out reduction reaction with carbon, when temperature reaches 1000~
After 1100 DEG C, iron ore starts acutely to restore；
Step 3: when high temperature section reduction reaction proceeds to 30-60min to iron ore in rotary kiln, reduction reaction speed is reduced,
At this time by granular material mass ratio be 20-35% low rank coal by spray gun use compressed air be injected in rotary kiln in after
Section, low rank coal contact in rotary kiln with high-temperature material；
Step 4: the coal gas being pyrolyzed in the rotary kiln inside the bed of material up flowing and during escaping the bed of material with iron ore
Stone contact, can be such that iron ore is further restored；
Step 5: the mixture of 900-950 DEG C of the high temperature reduction material and carbon residue that are discharged from rotary kiln discharge end is carried with being blown
Gas be injected to that oxygenation is molten to divide in furnace under the action of nitrogen, while using under the action of being blown carrier gas as air by lime stone, Gao Pin
Position one of mine or iron scale or it is a variety of be injected to that oxygenation is molten to divide in furnace, lime stone, high-grade ore or the oxygen of the penetrating
Changing one of iron sheet or a variety of mass ratioes for accounting for high temperature reduction material is 10%-20%, and oxygen-enriched hot air is blown into furnace；
Step 6: dividing in furnace oxygenation is molten, iron oxide is quickly reduced into iron at high temperature due to dissolving carbon in molten bath, in iron bath
Heat needed for reduction, the physical thermal brought by 1200 DEG C of oxygen-enriched 35% hot wind and its chemistry generated with CO second-time burning
Heat enters iron bath: the air motion of nozzle and the convective heat transfer of melting slag iron by three kinds of approach；High-temperature flue gas heat radiation passes
Heat；It is fallen after absorbing heat due to the frit reaction object that gas shock is splash and brings iron bath and fusing system into, these heats supply
To needed for miberal powder fusing, reduction and slagging process；
Step 7: the high temperature furnace slag of separating device discharge is melted in oxygenation, after atomized water spraying cooling, can obtain granulation grain slag；
Step 8: the high temperature liquid iron of separating device discharge is melted in oxygenation, and molten steel can be obtained after desulfurization and converter decarburization in molten iron.
Preferably, at 1000~1050 DEG C, the high temperature reduction time is the control of rotary kiln reduction section temperature in the step 5
60~90min.
Preferably, during the reduction of iron ore, contain certain combustibles from the escaping gas of material inside,
Combustibles are made to burn by blasting combustion air toward rotary kiln posterior segment, heat supply rotary kiln itself benefit for generation of burning
With.
Preferably, 600~700 DEG C of high-temperature flue gas being discharged from rotary kiln feeding end enter in cyclone dust collectors,
With the rotational flow of flue gas, granule dust sinks to assembling in centrifugal force and gravity in flue gas, and most of dust can be made heavy
Product is in cyclone dust collectors bottom.
Preferably, the high-temperature flue gas being discharged from cyclone dust collectors enters in air indirect heat exchanger, with air blower
The normal temperature air that blasts carries out heat exchange, and air themperature can be made to be increased to 500~550 DEG C, flue-gas temperature be reduced to 250 DEG C with
Under, the air after preheating is utilized as the combustion air of rotary kiln, and the flue gas being discharged from air indirect heat exchanger enters
It is dusted in bag filter, the clean flue gas after dedusting is discharged after smoke extractor pressurizes.
Preferably, described from the molten high-temperature flue gas for dividing furnace roof portion to be discharged of oxygenation, it is dropped by furnace roof petticoat pipe temperature from 1450 DEG C
To 1000 DEG C, high-temperature flue gas enters in heat regenerator after cyclone dust collectors dedusting again, high-temperature flue gas and oxygen-enriched air
Heat exchange is carried out, 1150-1250 DEG C of high temperature air of generation melts separating device for oxygenation and utilize；High-temperature flue-gas is reduced to 250-
It being discharged from heat regenerator after 350 DEG C, medium temperature flue gas enters back into waste heat boiler and carries out heat exchange with normal-temperature water later,
Low-pressure steam is generated after normal-temperature water heat absorption, steam is discharged from waste heat boiler to be utilized for user, is cooled to 100- through waste heat boiler
200 DEG C of flue gas enters in bag filter to be discharged after dedusting.
Compared with the prior art, the beneficial effects of the present invention are:
1, the present invention directly uses mill coal powder and Iron Ore Powder, cancels sintering and agglomeration process, cost of material decline to a great extent, due to
Steel and iron industry major pollutants and pernicious gas are mainly derived from sintering and coking process, and therefore, ring can be greatly reduced in this technique
Border pollution.
2, the present invention is able to selective reduction by controlling technological parameter, reduced iron during coal-based direct reduction
Without restoring other elements, lay a good foundation to produce Ultra-clean steel.
3, separating device is melted due to oxygenation and generates strong oxidizing property clinker, there is a preferable dephosphorization effect, it is hardly siliceous in molten iron, it is non-
Often it is suitble to smelt high phosphorus ore, this is the main feature for being different from other iron-smelting process.
4, the present invention starts a kind of less, more succinct, energy-saving and environment-friendly novel process of Ferrous Metallurgy of emission, to mitigate
The environmental emission pressure of " blast furnace-converter " Ferrous Metallurgy process, and there is apparent cost advantage.
In conclusion environmental pollution can be greatly reduced in the present invention, lay a good foundation to produce Ultra-clean steel, it is several in molten iron
It is not siliceous, it is very suitable to smelt high phosphorus ore, has started a kind of less, more succinct, energy-saving and environment-friendly Ferrous Metallurgy of emission
Novel process with the environmental emission pressure of mitigation " blast furnace-converter " Ferrous Metallurgy process, and has apparent cost advantage.
Detailed description of the invention
Fig. 1 is the molten process for dividing furnace short route molten iron making processes of rotary kiln coal-based direct reduction oxygenation proposed by the present invention
Schematic diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
In the description of the present invention, it is to be understood that, term " on ", "lower", "front", "rear", "left", "right", "top",
The orientation or positional relationship of the instructions such as "bottom", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, merely to just
In description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with
Specific orientation construction and operation, therefore be not considered as limiting the invention.
Referring to Fig.1, the oxygenation of rotary kiln coal-based direct reduction is molten divides furnace short route molten iron making processes, and technique includes following step
It is rapid:
Step 1: after the ratio that iron ore concentrate and binder are 100:2~4 in mass ratio is carried out ingredient and mixing, using cylinder
The granular material that aqueous mass ratio is 10~12%, granularity is 3~5mm is made in granulator, while production is incorporated in pelletization
The dedusting ash generated in the process；
Step 2: the granular material is added in rotary kiln, by preheating, the preheating temperature in preheating in rotary kiln band
Be 400-450 DEG C, after preheating time is 4-5min, iron ore starts to carry out reduction reaction with carbon, when temperature reaches 1000~
After 1100 DEG C, iron ore starts acutely to restore；
Step 3: when high temperature section reduction reaction proceeds to 30-60min to iron ore in rotary kiln, reduction reaction speed is reduced,
At this time by granular material mass ratio be 20-35% low rank coal by spray gun use compressed air be injected in rotary kiln in after
Section, low rank coal contact in rotary kiln with high-temperature material, and coal temperature in 600~800 DEG C/min temperature-rise period can be made to reach
It is pyrolyzed when to 500~900 DEG C, the pyrolysis coal gas and tar of spongy carbon residue and by-product can be obtained, tar can be used as revolution
The fuel of kiln is utilized；
Step 4: pyrolysis coal gas is up flowed inside the bed of material and is contacted during escaping the bed of material with iron ore in rotary kiln, can
Restore iron ore further, the CO2 and water vapour that reduction of iron ore generates carry out carbon with carbon residue at 800~1100 DEG C
The CO and higher H2 of reproducibility can be obtained in gasification reaction；Have since the molecular radius of H2 is smaller, when being contacted with iron ore higher
Reproducibility, it can be achieved that iron ore low temperature reduction with hydrogen；It, can by control rotary kiln reduction section temperature and high temperature reduction time
So that reducing gas is carried out selective gas base directly reducing, the iron being reduced with not by
The reduzate of other oxides mixing of reduction；
Step 5: the mixture of 900-950 DEG C of the high temperature reduction material and carbon residue that are discharged from rotary kiln discharge end is carried with being blown
Gas be injected to that oxygenation is molten to divide in furnace under the action of nitrogen, while using under the action of being blown carrier gas as air by lime stone, Gao Pin
Position one of mine or iron scale or it is a variety of be injected to that oxygenation is molten to divide in furnace, lime stone, high-grade ore or the oxygen of the penetrating
Changing one of iron sheet or a variety of mass ratioes for accounting for high temperature reduction material is 10%-20%, and oxygen-enriched hot air is blown into furnace；
Step 6: dividing in furnace oxygenation is molten, iron oxide is quickly reduced into iron at high temperature due to dissolving carbon in molten bath, in iron bath
Heat needed for reduction, the physical thermal brought by 1200 DEG C of oxygen-enriched 35% hot wind and its chemistry generated with CO second-time burning
Heat enters iron bath: the air motion of nozzle and the convective heat transfer of melting slag iron by three kinds of approach；High-temperature flue gas heat radiation passes
Heat；It is fallen after absorbing heat due to the frit reaction object that gas shock is splash and brings iron bath and fusing system into, these heats supply
To needed for miberal powder fusing, reduction and slagging process；
Step 7: the high temperature furnace slag of separating device discharge is melted in oxygenation, after atomized water spraying cooling, can obtain granulation grain slag；
Step 8: the high temperature liquid iron of separating device discharge is melted in oxygenation, and molten steel can be obtained after desulfurization and converter decarburization in molten iron.
The control of rotary kiln reduction section temperature is at 1000~1050 DEG C in the step 5, and the high temperature reduction time is 60~
90min。
During reduction of iron ore, contains certain combustibles from the escaping gas of material inside, pass through toward revolution
Kiln posterior segment, which blasts combustion air, makes combustibles burn, and the heat supply rotary kiln itself for generation of burning utilizes.
600~700 DEG C of high-temperature flue gas being discharged from rotary kiln feeding end enter in cyclone dust collectors, with the rotation of flue gas
Turn of tidal stream is dynamic, and granule dust sinks to assembling in centrifugal force and gravity in flue gas, and most of dust deposit can be made in cyclone dust removal
Device bottom.
The high-temperature flue gas being discharged from cyclone dust collectors enters in air indirect heat exchanger, and the room temperature blasted with air blower is empty
Gas carries out heat exchange, and air themperature can be made to be increased to 500~550 DEG C, and flue-gas temperature is reduced to 250 DEG C hereinafter, sky after preheating
Gas is utilized as the combustion air of rotary kiln, from air indirect heat exchanger be discharged flue gas enter in bag filter into
Row dedusting, the clean flue gas after dedusting are discharged after smoke extractor pressurizes.
From the molten high-temperature flue gas for dividing furnace roof portion to be discharged of oxygenation, 1000 DEG C are down to from 1450 DEG C by furnace roof petticoat pipe temperature, height
Warm flue gas enters in heat regenerator after cyclone dust collectors dedusting again, and high-temperature flue gas and oxygen-enriched air carry out heat exchange,
1150-1250 DEG C of high temperature air of generation melts separating device for oxygenation and utilizes；High-temperature flue-gas be reduced to 250-350 DEG C after from storage
It is discharged in hot type heat exchanger, medium temperature flue gas enters back into and carries out heat exchange in waste heat boiler with normal-temperature water later, normal-temperature water heat absorption
After generate low-pressure steam, steam is discharged from waste heat boiler to be utilized for user, and 100-200 DEG C of flue gas is cooled to through waste heat boiler
It enters in bag filter and is discharged after dedusting.
In the present invention, the raw material and equipment being related to have: iron ore concentrate, batch mixer, rotary kiln, beans or high-grade ore spray gun,
Cyclone dust collectors, air indirect heat exchanger, bag filter, oxygenation is molten divide furnace, high temperature reduction material spray gun, lime stone spray gun,
High-grade ore or iron scale spray gun, regenerative heat-exchange, waste heat boiler, pressure-swing absorption apparatus etc..
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (6)
1. rotary kiln coal-based direct reduction oxygenation is molten to divide furnace short route molten iron making processes, which is characterized in that the technique includes
Following steps:
Step 1: after the ratio that iron ore concentrate and binder are 100:2~4 in mass ratio is carried out ingredient and mixing, using cylinder
The granular material that aqueous mass ratio is 10~12%, granularity is 3~5mm is made in granulator, while production is incorporated in pelletization
The dedusting ash generated in the process；
Step 2: the granular material is added in rotary kiln, by preheating, the preheating temperature in preheating in rotary kiln band
Be 400-450 DEG C, after preheating time is 4-5min, iron ore starts to carry out reduction reaction with carbon, when temperature reaches 1000~
After 1100 DEG C, iron ore starts acutely to restore；
Step 3: when high temperature section reduction reaction proceeds to 30-60min to iron ore in rotary kiln, reduction reaction speed is reduced,
At this time by granular material mass ratio be 20-35% low rank coal by spray gun use compressed air be injected in rotary kiln in after
Section, low rank coal contact in rotary kiln with high-temperature material；
Step 4: the coal gas being pyrolyzed in the rotary kiln inside the bed of material up flowing and during escaping the bed of material with iron ore
Stone contact, can be such that iron ore is further restored；
Step 5: the mixture of 900-950 DEG C of the high temperature reduction material and carbon residue that are discharged from rotary kiln discharge end is carried with being blown
Gas be injected to that oxygenation is molten to divide in furnace under the action of nitrogen, while using under the action of being blown carrier gas as air by lime stone, Gao Pin
Position one of mine or iron scale or it is a variety of be injected to that oxygenation is molten to divide in furnace, lime stone, high-grade ore or the oxygen of the penetrating
Changing one of iron sheet or a variety of mass ratioes for accounting for high temperature reduction material is 10%-20%, and oxygen-enriched hot air is blown into furnace；
Step 6: dividing in furnace oxygenation is molten, iron oxide is quickly reduced into iron at high temperature due to dissolving carbon in molten bath, in iron bath
Heat needed for reduction, the physical thermal brought by 1200 DEG C of oxygen-enriched 35% hot wind and its chemistry generated with CO second-time burning
Heat enters iron bath: the air motion of nozzle and the convective heat transfer of melting slag iron by three kinds of approach；High-temperature flue gas heat radiation passes
Heat；It is fallen after absorbing heat due to the frit reaction object that gas shock is splash and brings iron bath and fusing system into, these heats supply
To needed for miberal powder fusing, reduction and slagging process；
Step 7: the high temperature furnace slag of separating device discharge is melted in oxygenation, after atomized water spraying cooling, can obtain granulation grain slag；
Step 8: the high temperature liquid iron of separating device discharge is melted in oxygenation, and molten steel can be obtained after desulfurization and converter decarburization in molten iron.
2. rotary kiln coal-based direct reduction oxygenation according to claim 1 is molten to divide furnace short route molten iron making processes, special
Sign is, in the step 5 control of rotary kiln reduction section temperature at 1000~1050 DEG C, the high temperature reduction time is 60~
90min。
3. rotary kiln coal-based direct reduction oxygenation according to claim 1 is molten to divide furnace short route molten iron making processes, special
Sign is, during the reduction of iron ore, contains certain combustibles from the escaping gas of material inside, by back
Rotary kiln posterior segment, which blasts combustion air, makes combustibles burn, and the heat supply rotary kiln itself for generation of burning utilizes.
4. rotary kiln coal-based direct reduction oxygenation according to claim 1 is molten to divide furnace short route molten iron making processes, special
Sign is that 600~700 DEG C of high-temperature flue gas being discharged from rotary kiln feeding end enter in cyclone dust collectors, with flue gas
Rotational flow, granule dust sinks aggregation in centrifugal force and gravity in flue gas, and most of dust deposit can be made in whirlwind
Deduster bottom.
5. rotary kiln coal-based direct reduction oxygenation according to claim 4 is molten to divide furnace short route molten iron making processes, special
Sign is that the high-temperature flue gas being discharged from cyclone dust collectors enters in air indirect heat exchanger, blasts with air blower normal
Warm air carries out heat exchange, air themperature can be made to be increased to 500~550 DEG C, flue-gas temperature is reduced to 250 DEG C hereinafter, after preheating
Air utilized as the combustion air of rotary kiln, from air indirect heat exchanger be discharged flue gas enter bag filter
In be dusted, the clean flue gas after dedusting is discharged after smoke extractor pressurizes.
6. rotary kiln coal-based direct reduction oxygenation according to claim 1 is molten to divide furnace short route molten iron making processes, special
Sign is, described to be down to 1000 DEG C from 1450 DEG C by furnace roof petticoat pipe temperature from the molten high-temperature flue gas for dividing furnace roof portion to be discharged of oxygenation,
High-temperature flue gas enters in heat regenerator after cyclone dust collectors dedusting again, and high-temperature flue gas and oxygen-enriched air carry out hot friendship
It changes, 1150-1250 DEG C of high temperature air of generation melts separating device for oxygenation and utilize；After high-temperature flue-gas is reduced to 250-350 DEG C
It is discharged from heat regenerator, medium temperature flue gas enters back into waste heat boiler and carries out heat exchange, normal-temperature water with normal-temperature water later
Low-pressure steam is generated after heat absorption, steam is discharged from waste heat boiler to be utilized for user, is cooled to 100-200 DEG C through waste heat boiler
Flue gas is entered in bag filter and is discharged after dedusting.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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