CN105441670A - Technology for producing high-proportion hematite pellets through chain-loop-ring system - Google Patents
Technology for producing high-proportion hematite pellets through chain-loop-ring system Download PDFInfo
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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
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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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
- C22B1/16—Sintering; Agglomerating
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Abstract
The invention discloses a technology for producing high-proportion hematite pellets through a chain-loop-ring system, and belongs to the technical field of production of iron ore pellets in the metallurgical industry. The technology comprises the steps that powdered iron pre-batching is carried out, bentonite is added into the pre-batching powder, a pelletizing disc is used for pelletizing, and the content of fresh pellets with the granularity being 12+/-2mm is larger than or equal to 98% by weight; then the pallets enter the chain-loop-ring system, the air temperature of a rotary kiln keeps between 1300 DEG C to 1350 DEGC, and four-segment cooling is adopted in a ring cooling machine; through the technologies of wet grinding, high-pressure rolling and natural gas nozzle heat supplementing are additionally performed, the granularity of hematite is reduced, the specific surface area is increased, the grain surface is activated, and the quality of the fresh pellets is increased. The technology has the beneficial effects that the matching average of the hematite is larger than or equal to 70% and even reaches 100%; and the pellets with the strength larger than or equal to 2500N/unit occupies 98%, and the proportion of the bentonite is lower.
Description
Technical field
The invention belongs to the iron ore pellets production technical field in metallurgical industry, particularly a kind of chain-return-loop systems produces the technique of high mixture ratio hematite pellets.Be applicable to the production of high mixture ratio rhombohedral iron ore acidic oxidation pelletizing.
Background technology
At ferrous metallurgy iron ore pellets production field, FeO oxidation heat liberation in magnetite, can save the heat input of about 50%; It is low that solid phase consolidation starts temperature, and last till 1350 DEG C from 800 DEG C, consolidation mechanism has Fe
2o
3crystallite connects, Fe
2o
3recrystallize, Fe
3o
4recrystallize and liquid phase bond 4 kinds, and consolidation balling-up is comparatively strong, and pelletizing reductibility is better; And rhombohedral iron ore consolidation temperature is high, burnup is high, and intercrystalline cross structure starts formation temperature at 1300 DEG C, just occurs recrystallize consolidation when 1350 DEG C, and consolidation balling-up is poor.Pelletizing burning during more than 1350 DEG C, Fe
2o
3start again to decompose and generate Fe
3o
4, pelletizing consolidation strength starts to decline.Therefore no matter be shaft furnace process, belt type roasting machine method, or grate kiln method, in raw material with addition of rhombohedral iron ore amount be all subject to great restriction.Domestic conventional fuel calorific value is generally on the low side on the one hand, and high performance fuel are rare, expensive; The temperature required height of rhombohedral iron ore roasting on the other hand, consolidation temperature narrow range, not easily manipulates.Current national conditions are: domestic iron ore of producing is based on magnetite, and lean ore is many and assorted, and component difference is large, under-supply in current technique of preparing lower magnet ore deposit, and in iron material, 50% needs to rely on import, and imported iron ore is main mainly with rhombohedral iron ore.When how to improve acidic oxidation pellet formation, in pellet feed, the proportioning of rhombohedral iron ore is current problem demanding prompt solution.The existing method about the large proportioning agglomerates of rhombohedral iron ore has: inside join fuel process, in join flux method, merely add burner method at drying grate side plate.The present invention is significantly different from invention part in the past and is: join fuel, flux not, under joining the prerequisite of the strong heat release batching of oxidation not, strengthen the raw material before rhombohedral iron ore pelletizing to prepare, increase substantially quality of green pellets, enter drying grate epigranular and reduce one-level, supplement external heat source and supplementary pure oxygen simultaneously, improve maturing temperature and air-flow oxygen level, reach the object improving pellet strength and reductibility.Finished ball pellet quality is better than common magnetic/hematite pellets.Mainly consider from following several respects: one, rhombohedral iron ore granularity is comparatively thick, have employed wet-milling and to add high pressure roller process technique; Two, supplement heat energy, magnetite is reduced in proportion brought heat release exposed, supplemented by external heat source; Three, supplement purity oxygen, improve air-flow oxygen level, impel oxidation terminal in advance; Four, strengthen green-ball to prepare, the whole grain technique of green-ball is set.
Summary of the invention
The object of the present invention is to provide a kind of chain-return-loop systems to produce the technique of high mixture ratio hematite pellets, to solve in raw material with addition of the limited problem of rhombohedral iron ore amount.
Chain-return-loop systems produces a technique for high mixture ratio hematite pellets, concrete steps and parameter as follows:
1, Iron concentrate is prepared burden in advance, by the fine powder of magnetite mixing of the rhombohedral iron ore fine powder of >=70wt% and≤30wt%, then carries out wet-milling, makes powder proportions >=98% of-200 order granularities; Powder of preparing burden in advance is again unified dry, and moisture content≤8%, carries out high pressure roller mill afterwards.Practice shows high pressure roller mill best results under this moisture, and mixing iron powder specific surface area increases to>=1800cm
2/ g, specific surface area increasing amount>=400cm
2/ g, activated particle surface energy, is more conducive to cohere balling-up simultaneously.
2, in prewired powder, add wilkinite, content is the 1.0-1.4wt% of prewired powder gross weight, then adds the dedusting ash of 0-1wt%, carries out vertical mixing, makes each grain class distribution even.
3, balling disk (-sc) pelletizing, controls green-ball moisture at 8-8.5%, balling disk (-sc) rotating speed 5-8r/min, 45 °-48 °, inclination angle, Balling time 8-15min, makes granularity be the green-ball content >=98wt% of 12 ± 2mm.
4, enter chain-return-loop systems, drying grate 1 adopts drum dry section 12, the section of draining 13, preheating I section 14 and preheating II section 15 technique; Rotary kiln 2 adopts coal burner as thermal source, and in kiln, wind-warm syndrome remains on 1300-1350 DEG C, does not surpass 1350 DEG C; Central cooler 3 adopts four sections of coolings, and cooling I section 16 wind directly enters rotary kiln 2, introduces preheating II section 15 in suction function subinverse logistics direction of motion; Cooling II section 17 wind leads back preheating I section 14 material top; Cooling III section 18 wind leads back drum dry section 12 material bottom bellows, and hot blast is through material bed and emptying; Draw under preheating II section 15 hot blast, introduce in the petticoat pipe of the section of draining 13 material top; The section of draining 13 and preheating I section 14 hot blast draw under material bed, introduce main induced draft fan 5, by emptying after dedusting, purification objectionable impurities;
5, add 3 the second natural gas combustion nozzles 21 respectively in preheating II section 15 both sides, wind-warm syndrome is reached in advance and remains on about 1280 ± 20 DEG C, rhombohedral iron ore starts solid phase consolidation in advance; From the hot-blast main that cooling II section 17 leads back, add first day gas-fired burner 20, totally 3, increase preheating I section 14 wind-warm syndrome, make wind-warm syndrome be 1200 DEG C-1250 DEG C.In the both sides of preheating I section 14, the uniform oxygenating gas jets 22 in top of preheating II section 15, totally 12.High purity oxygen gas consumption is that every 4 moles of FeO supplement 1 mole of oxygen; Make contained magnetite fulfil oxidation course ahead of schedule, become rhombohedral iron ore crystal grain completely.Magnetite oxidation heat liberation, heat smoke circulates, and drying grate each section of wind-warm syndrome generally improves.Enter the requirement of machine cracking temperature of green pellet higher, depend on wet-milling and high pressure roll process to improve greenball properties.
6, IV section 19 wind is cooled emptying.Temperature <150 DEG C after pelletizing cooling.By adding wet-milling, high pressure roll-in, Sweet natural gas concurrent heating technique, reducing rhombohedral iron ore granularity, increasing specific surface area, activation grain surface, strengthens quality of green pellets, fulfils pelletizing oxidising process ahead of schedule.Make shatter strength of green pellet >7 time/, >10 time that more optimizes/.Extend and keep rhombohedral iron ore consolidation time 13 ± 3min, Fe
2o
3recrystallize consolidation ratio is 80% ~ 100%, significantly increases acid pellet ultimate compression strength, improves reductibility, simultaneously remarkable dust content in minimizing system, significantly reduces ring formation of rotary kiln probability, make rotary kiln not ring formation or ring formation thinner.
The fine powder of rhombohedral iron ore described in step 1 does not separately join the flux such as lime, does not separately join other with/without machine binding agent, joins carbon/Pulverized Coal not, joins the strong exothermic material of oxidation not.
In step 4, rotary kiln 2 can adopt other thermal source, as coke powder, coke-oven gas, shale gas, heavy oil, petroleum coke powder etc.
The Sweet natural gas that in step 5, natural gas combustion nozzle is used can adopt other high heating value medium to substitute, and burner form also can respective change.As adopted shale gas, heavy oil etc.
Pellet strength higher (>=2500N/ accounts for 98%) in the present invention, reductibility is more excellent.
The present invention is applicable to the traditional chain-return-pellet quality upgrading of ring production system, and technique is by force implantable.
Rhombohedral iron ore proportioning of the present invention on average >=70%, even reaches 100%.
Bentonite ore ratio of the present invention is lower, only has 1.0-1.4%.Usually with addition of 1/4 of amount, even can be lower.Improve pellet Iron grade.
Invention increases wet-grinding technology and relative device.To the general thicker rhombohedral iron ore of granularity, pre-treatment before pelletizing ,-200 orders improve 17 percentage points, reach 98%.-325 order quantity >=80%.
Invention increases high pressure roller mill technique.Process for iron ore concentrate grain shape and specific surface area, average specific surface area>=1800cm
2/ g, increases particle surface activation energy, promotes balling-up, significantly reduces wilkinite or substitute additive amount simultaneously.
The present invention traditional chain-return-ring Power Cycle basis on add concurrent heating technique and oxygenating technique.Heating value of natural gas is high, expense is little, is comparatively applicable to concurrent heating and arranges.Supplemental oxygen expense is less, available storage tank or comprehensive pipe network supply, but will ensure the stability entering drying grate oxygen pressure.Two covering devices are all applicable to legacy system and implant and pellet quality upgrading.
The whole grain flow process of the present invention to green-ball strictly controls.Make green-ball granularity 12mm grade >=98%.The green-ball of this granularity, no matter from heat of oxidation mechanics or kinetics, is all optimum size.Metallurgical performance is best, roasting is the most energy-conservation.
Compound of the present invention adopts vertical strengthened hybrid technique.The built-in 3-4 of this hybrid mode overlaps vertical mixing slurry, and wolf's fang is irregular staggered, raw meal particle size is more evenly distributed, does not almost have segregation, and a large amount of bead assembles nucleation, and pole is beneficial to later stage green-ball granulation and grows up.
The invention has the advantages that:
1, rhombohedral iron ore proportioning on average >=70%, even reaches 100%.Support the production of large proportioning rhombohedral iron ore oxidizing roasting pelletizing.
2, pellet strength higher (>=2500N/ accounts for 98%), reductibility is more excellent.
3, bentonite ore ratio is lower, only has 1.0-1.4%.Usually with addition of 1/4 of amount, even can be lower.Improve pellet Iron grade.
The pellet quality upgrading of 4, applicable traditional chain-return-ring production system, technique is by force implantable.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Fig. 2 is energy flow systemic circulation characteristic pattern of the present invention.Wherein, drying grate 1, rotary kiln 2, central cooler 3, drum dry-air blast machine 4, main induced draft fan 5, backheat blower fan 6, chimney 7, cooling I gas blower 8, cooling II gas blower 9, cooling III gas blower 10, cooling IV gas blower 11, the dry section 12 of drum, the section of draining 13, preheating I section 14, preheating II section 15, cooling I section 16, cooling II section 17, cooling III section 18, cooling IV section 19, first day gas-fired burner 20, second natural gas combustion nozzle 21, oxygenating gas jets 22.
Fig. 3 is wet-grinding technology and relative device schema of the present invention.
Fig. 4 is the whole grain technological layout of green-ball of the present invention.Wherein, yaw belt 23, large ball roll screen 24, wide conveyor 25, roll-type distributor 26, green-ball conveyor 27, drying grate 1.
Embodiment
Embodiment 1
Be described for Anyang 1,200,000 t/a pellet formation example.
Rhombohedral iron ore and magnetite mixing ratio are 7:3.
Rhombohedral iron ore (amount of allocating into >=70%, even 100%) and magnetite enter wet-milling workshop after preparing burden in advance by certain ratio together.Compound former granularity-200 order accounts for 81.8%, and-325 orders account for 51.97%.After one section of open-circuit grinding (wet-grinding technology and relative device flow process as shown in Figure 3) ,-200 orders account for 98%, and-325 orders account for 80%.Be equipped with MQY3600 × 8500 overflow ball mill 2, HTG-80 ㎡ ceramic filter 6 (2 for subsequent use).The small grain size iron ore concentrate that ceramic filter is selected, enter drying machine drying, moisture control is 8 ± 0.5%.High-pressure roller mill improves particle shape, increase specific grain surface amass, 70% rhombohedral iron ore with addition of 30% magnetite, charge ratio surface-area 1300cm
2/ g, after process, specific surface area 100% is greater than 1800cm
2/ g.
Allocate in the pre-batching powder processed 1.0-1.4% wilkinite and 1% dedusting ash after, enter vertical strengthened mixing machine strengthening mixing, mixing time 1.0min, rotor with eccentric position and fixing multi-purpose tool directing material flow, push stirring area to, the streams of dispersion is directed to motion in the other direction, and rotor plays mixing effect to recycle stream, and mixing efficiency reaches 98%.After balling disc pelletizing, carry out green-ball and sieve whole grain.Green-ball sieves whole grain and is made up of 4 covering devices, comprises yaw conveyor 23, large ball roll screen 24, wide conveyor 25 and roll-type distributor 26.The whole grain technological layout of green-ball as shown in Figure 4; During green-ball treatment capacity 300t/h, 11 °, yaw belt 23 inclination angle, hunting frequency 4-7 time/min (frequency conversion is adjustable), average 5.5 times/min, pivot angle 18.08 ° (adjustable), belt speed 0.8m/s, bandwidth 1200mm.Large ball roll screen 24 roller gap 14mm (adjustable), 13 °, inclination angle, roll screen diameter of phi 121mm, 27, roll screen effective width 4000mm; Wide 13 °, conveyor 25 inclination angle, belt speed is less than or approximates 0.2m/s, bandwidth 4200mm; Roll-type distributor 26 roller footpath φ 121mm, 47, roller gap 10mm (adjustable), 18 °, inclination angle, effective width 4000mm.By strictly controlling this operation, 12mm particles content is more than or equal to 98%.
Green-ball enters drying grate 1 drying and preheating, is oxidized simultaneously.Uniform with addition of 6 oxygen replenishment nozzles in preheating I section 14 both sides, uniform with addition of 6 oxygen replenishment nozzles at preheating II section 15 top, arranging oxygenating gas jets 22 quantity is altogether 12.High purity oxygen gas is about 1:4 with FeO amount of substance ratio in dry ball; At cooling II section 17 heating duct end, install 3 first day gas-fired burners 20 additional, the long 1.0-1.5m of flame, perpendicular to fire smoke gases flow velocity 8-12m/s, mean flow rate 10m/s, preheating I section 14 environment oxygen level 18-20%, 3 burners share a burner blower, after concurrent heating, flue-gas temperature improves 200-250 DEG C, average raising 225 DEG C; In 1200000 t/a pelletizings, cooling II section 17 times hot-blast main internal diameter Φ 2100mm, Sweet natural gas consumption 200-260Nm3/h, average consumption 235Nm
3/ h.At preheating II section 15 sidewall, every side adds 3 the second natural gas combustion nozzles 21, the long 1.5-2.0m of flame, be about 10m/s perpendicular to flame direction flue gas flow rate, preheating II section environment oxygen content 18-20%, after concurrent heating, temperature improves 200-250 DEG C, reach 1300 DEG C, 6 burners share a burner blower; In 1200000 t/a pelletizings, Sweet natural gas consumption 120-150Nm
3/ h, average consumption 130Nm
3/ h.Energy flow systemic circulation and concurrent heating oxygenating process station are as shown in Figure 2.
Complete the powdered iron ore after oxidation, enter rotary kiln 2 and continue baking and concretion.Rotary kiln still uses four/bis-traditional way duct powder coal burner heat supplies, and between maintaining temperature of combustion 1300-1350 DEG C, here, pelletizing mainly carries out rhombohedral iron ore recrystallize consolidation, and this consolidation form accounts for 99%; This form agglomerated pellet intensity is the highest, and reductibility is best, is better than the pellet of general consolidation form.
Pellet after insulation consolidation enters four-part form central cooler 3 and cools.Final pelletizing temperature <150 DEG C.Complete technique whole process.Integrated artistic schema as shown in Figure 1.Prepared by sufficient raw material before pelletizing, after pelletizing high temperature section in advance, reduce rhombohedral iron ore green pellet cracking rate, content of powder in reduction system, reduce ring formation of rotary kiln risk.
In this technique, rotary kiln can adopt other thermal source, as coke powder, coke-oven gas, shale gas, heavy oil, petroleum coke powder etc.But heat supply temperature is minimum can not lower than 1300 DEG C.
In this technique, concurrent heating burner can adopt other high heating value thermal source to substitute, as shale gas, heavy oil etc.But after heat supply, ambient temperature is minimum can not lower than 1280 DEG C.
In this technique, strengthening and prepare the raw material of rhombohedral iron ore fine powder, is that invention distinguishes of the present invention is in the characteristic of other patent.
In this technique, the consumption of strengthening oxygenating measure oxygen is few, and in air-flow, oxygen level is high, fulfil the oxidising process of pelletizing ahead of schedule, the function of rotary kiln is changed into completely simple under high temperature conservation condition, the crystallization of rhombohedral iron ore, recrystallize consolidation process, the consolidation strength of strengthening pellet.That invention distinguishes of the present invention is in the characteristic of other patent.
In this technique, the energy flow recycle system be by domestic typical chain-return-ring magnet ore deposit sinter process based on, with the local magnetite powder mix of Brazilian VCRD hematite concentrates and Anyang for foundation, if by other chain-return-ring Power Cycle carry out transformation large-scale roasting rhombohedral iron ore, experimental study need be re-started according to feedstock property, determine technical process.
Claims (5)
1. chain-return-loop systems produces a technique for high mixture ratio hematite pellets, it is characterized in that, concrete steps and parameter as follows:
1) Iron concentrate is prepared burden in advance, by the fine powder of magnetite mixing of the rhombohedral iron ore fine powder of>=70wt% and≤30wt%, then carries out wet-milling, makes powder proportions>=98% of-200 order granularities; Powder of preparing burden in advance is again unified dry, and moisture content≤8%, carries out high pressure roller mill afterwards; Mixing iron powder specific surface area increases to>=1800cm
2/ g, specific surface area increasing amount>=400cm
2/ g, activated particle surface energy, is more conducive to cohere balling-up simultaneously;
2) in prewired powder, add wilkinite, content is the 1.0-1.4wt% of prewired powder gross weight, then adds the dedusting ash of 0-1wt%, carries out vertical mixing, makes each grain class distribution even;
3) ball dish pelletizing, controls green-ball moisture at 8-8.5%, balling disk (-sc) rotating speed 5-8r/min, 45 °-48 °, inclination angle, Balling time 8-15min, makes granularity be the green-ball content >=98wt% of 12 ± 2mm;
4) enter chain-return-loop systems, drying grate (1) adopts drum dry section (12), the section of draining (13), preheating I section (14) and preheating II section (15) technique; Rotary kiln (2) adopts coal burner as thermal source, and in kiln, wind-warm syndrome remains on 1300-1350 DEG C; Central cooler (3) adopts four sections of coolings, and cooling I section (16) wind directly enters rotary kiln (2), introduces preheating II section (15) in suction function subinverse logistics direction of motion; Cooling II section (17) wind leads back preheating I section (14) material top; Cooling III section (18) wind leads back drum dry section (12) material bottom bellows, and hot blast is through material bed and emptying; Draw under preheating II section (15) hot blast, introduce in the petticoat pipe of the section of draining (13) material top; The section of draining (13) and preheating I section (14) hot blast draw under material bed, introduce main induced draft fan (5), by emptying after dedusting, purification objectionable impurities;
5) add 3 the second natural gas combustion nozzles (21) respectively in preheating II section (15) both sides, wind-warm syndrome is reached in advance and remains on about 1280 ± 20 DEG C, rhombohedral iron ore starts solid phase consolidation in advance; From the hot-blast main that cooling II section (17) leads back, add first day gas-fired burner (20), totally 3, increase preheating I section (14) wind-warm syndrome, make wind-warm syndrome be 1200 DEG C-1250 DEG C; In the both sides of preheating I section (14), the uniform oxygenating gas jets (22) in top of preheating II section (15), totally 12; High purity oxygen gas consumption is that every 4 moles of FeO supplement 1 mole of oxygen; Make contained magnetite fulfil oxidation course ahead of schedule, become rhombohedral iron ore crystal grain completely; Magnetite oxidation heat liberation, heat smoke circulates, and drying grate (1) each section of wind-warm syndrome improves;
6) IV section (19) wind is cooled emptying; Temperature <150 DEG C after pelletizing cooling; Add wet-milling, high pressure roll-in, Sweet natural gas concurrent heating technique, fulfil pelletizing oxidising process ahead of schedule; Make shatter strength of green pellet >7 time/; Extend and keep rhombohedral iron ore consolidation time 13 ± 3min, Fe
2o
3recrystallize consolidation ratio is 80% ~ 100%.
2. technique according to claim 1, is characterized in that, step 1) described in rhombohedral iron ore fine powder separately do not join lime flux, separately do not join other with/without machine binding agent, not, join carbon/Pulverized Coal, join not oxidation strong exothermic material.
3. technique according to claim 1, is characterized in that, step 4) in rotary kiln (2) adopt thermal source be: coke powder, coke-oven gas, shale gas, heavy oil and petroleum coke powder.
4. technique according to claim 1, is characterized in that, step 5) in natural gas combustion nozzle Sweet natural gas rock gas used, heavy oil substitute.
5. technique according to claim 1, is characterized in that, step 6) middle shatter strength of green pellet >10 time/.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106566921A (en) * | 2016-11-03 | 2017-04-19 | 内蒙古包钢钢联股份有限公司 | Technological method for lowering grating machine-rotary kiln ringing degree |
| CN107604156A (en) * | 2017-08-31 | 2018-01-19 | 包头钢铁（集团）有限责任公司 | A kind of oxide pellet and preparation method thereof |
| CN109682204A (en) * | 2018-11-15 | 2019-04-26 | 新兴铸管股份有限公司 | A method of reducing kiln end of pellet rotary kiln tail exhaust gas nitrous oxides concentration |
| CN110512074A (en) * | 2019-09-29 | 2019-11-29 | 东北大学 | A kind of method that high mixture ratio New Zealand sea sand raw ore prepares acid pellet |
| CN113278793A (en) * | 2021-04-19 | 2021-08-20 | 昆明理工大学 | Layered ore blending method for pellet ore |
| WO2022049781A1 (en) * | 2020-09-03 | 2022-03-10 | 株式会社神戸製鋼所 | Iron ore pellets and manufacturing method of iron ore pellets |
| WO2024039279A1 (en) * | 2022-08-17 | 2024-02-22 | Luossavaara-Kiirunavaara Ab | Method and apparatus for producing a metal oxide material |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106566921A (en) * | 2016-11-03 | 2017-04-19 | 内蒙古包钢钢联股份有限公司 | Technological method for lowering grating machine-rotary kiln ringing degree |
| CN107604156A (en) * | 2017-08-31 | 2018-01-19 | 包头钢铁（集团）有限责任公司 | A kind of oxide pellet and preparation method thereof |
| CN109682204A (en) * | 2018-11-15 | 2019-04-26 | 新兴铸管股份有限公司 | A method of reducing kiln end of pellet rotary kiln tail exhaust gas nitrous oxides concentration |
| CN110512074A (en) * | 2019-09-29 | 2019-11-29 | 东北大学 | A kind of method that high mixture ratio New Zealand sea sand raw ore prepares acid pellet |
| WO2022049781A1 (en) * | 2020-09-03 | 2022-03-10 | 株式会社神戸製鋼所 | Iron ore pellets and manufacturing method of iron ore pellets |
| JP7374870B2 (en) | 2020-09-03 | 2023-11-07 | 株式会社神戸製鋼所 | iron ore pellets |
| CN113278793A (en) * | 2021-04-19 | 2021-08-20 | 昆明理工大学 | Layered ore blending method for pellet ore |
| CN113278793B (en) * | 2021-04-19 | 2022-02-18 | 昆明理工大学 | Layered ore blending method for pellet ore |
| WO2024039279A1 (en) * | 2022-08-17 | 2024-02-22 | Luossavaara-Kiirunavaara Ab | Method and apparatus for producing a metal oxide material |
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Application publication date: 20160330 |