CN103667572B - The gas-based shaft kiln directly reduced smelting process of a kind of high-chromic vanadium-titanium ferroferrite - Google Patents
The gas-based shaft kiln directly reduced smelting process of a kind of high-chromic vanadium-titanium ferroferrite Download PDFInfo
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- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000003723 Smelting Methods 0.000 title claims abstract description 15
- 230000008569 process Effects 0.000 title claims abstract description 12
- 238000011084 recovery Methods 0.000 claims abstract description 24
- 239000008188 pellet Substances 0.000 claims abstract description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 18
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 15
- 239000011651 chromium Substances 0.000 claims abstract description 15
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 15
- 239000010936 titanium Substances 0.000 claims abstract description 15
- 238000000227 grinding Methods 0.000 claims abstract description 14
- 238000005453 pelletization Methods 0.000 claims abstract description 13
- 239000002253 acid Substances 0.000 claims abstract description 12
- 229910000805 Pig iron Inorganic materials 0.000 claims abstract description 11
- 229910052742 iron Inorganic materials 0.000 claims abstract description 11
- 239000002893 slag Substances 0.000 claims abstract description 11
- WFISYBKOIKMYLZ-UHFFFAOYSA-N [V].[Cr] Chemical compound [V].[Cr] WFISYBKOIKMYLZ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 28
- 230000009467 reduction Effects 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 15
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 11
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 10
- 239000012141 concentrate Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 229910000278 bentonite Inorganic materials 0.000 claims description 4
- 239000000440 bentonite Substances 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 4
- 238000001238 wet grinding Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 3
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 2
- 229910052786 argon Inorganic materials 0.000 claims description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 abstract description 16
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 13
- 230000001590 oxidative effect Effects 0.000 abstract description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 10
- 239000000203 mixture Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 238000001465 metallisation Methods 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910011212 Ti—Fe Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- -1 recovery rate 92.97% Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- XSQMSOYAHMZLJC-UHFFFAOYSA-N [Cr].[Ti].[V] Chemical compound [Cr].[Ti].[V] XSQMSOYAHMZLJC-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000031068 symbiosis, encompassing mutualism through parasitism Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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Abstract
The invention discloses the gas-based shaft kiln directly reduced smelting process of a kind of high-chromic vanadium-titanium ferroferrite, the method take shaft furnace as major equipment, with 100% high-chromic vanadium-titanium ferroferrite for raw material, it is characterized in that adopting ore grinding, pelletizing, oxidizing roasting produces acid pellet, then be placed in shaft furnace and utilize reducing gas to carry out direct-reduction, deliver to again in high frequency furnace and carry out molten point, obtain containing vanadium chromium pig iron and titanium slag.In the pig iron that the inventive method obtains, the grade of iron and recovery rate are all greater than 90%, vanadium and chromium recovery rate all higher than 85%, TiO in titanium slag
2grade be about 40%, recovery rate reaches 85-90%.
Description
Technical field
The invention belongs to Metallurgical resources technical field of comprehensive utilization, be specifically related to the gas-based shaft kiln directly reduced smelting process of a kind of high-chromic vanadium-titanium ferroferrite.
Background technology
The v-ti magnetite ore resources of China is comparatively abundant, is mainly distributed in the area such as Panxi, Sichuan, Chengde.According to the height of Cr2O3 content, vanadium titano-magnetite is divided into again coventional type vanadium titano-magnetite and high-chromic vanadium-titanium ferroferrite.High-chromic vanadium-titanium ferroferrite, as a kind of special v-ti magnetite ore resources, has precious chromium resource except containing going back association except iron, vanadium, titanium, and to climb western red lattice area high-chromic vanadium-titanium ferroferrite, its chromium reserves reach 9,000,000 tons.
Vanadium titano-magnetite has " poor ", " carefully ", " faling apart ", " mixing " feature, in addition, valuable mineral is of a great variety, and each other closely symbiosis.Compared with common vanadium titano-magnetite, the mineral composition of high-chromic vanadium-titanium ferroferrite is more complicated, make agglomeration, blast-furnace smelting and vanadium, titanium, chromium resource comprehensive utilization more difficult, and correlative study is both at home and abroad quite deficient, system integration technology is not yet formed, suitability for industrialized production belongs to blank substantially, causes the exploitation of climbing western red lattice area high-chromic vanadium-titanium ferroferrite at present small, and inadequate specification.Therefore Appropriate application high-chromic vanadium-titanium ferroferrite, improves many metals associated mineral resource efficiency utilization level, is the key subjects that current Mineral Resources in China exploitation aspect faces.
At present, high chromium vanadium titanium octahedral iron ore mainly carries out agglomeration-blast-furnace smelting.The blast furnace smelting method (CN102433404) of the high chromium height vanadium schreyerite that Heilongjiang Jianlong Iron & Steel Co., Ltd. proposes, quality proportioning high chromium height vanadium type schreyerite powder and non-V-Ti-Fe concentrate fines and auxiliary material between 10% ~ 20% are made agglomerate after preparing burden, and sinter basicity controls 2.2 ~ 2.45; Pellet is made by after the high chromium height vanadium type schreyerite powder of quality proportioning between 40% ~ 60% and non-V-Ti-Fe concentrate fines and binder formulation.By volume per-cent is allocated the agglomerate of 55% ~ 60% and 40% ~ 45% pellet into blast furnace and is carried out blast-furnace smelting.Use this technique first and the smelting of unrealized overall height chromic vanadium-titanium ferroferrite; Secondly, high-chromic vanadium titanium agglomerate and pellet are in blast furnace ironmaking process, and owing to being subject to the pollution of solid reductant, reduzate is unholiness, and grade is low, fail to realize high-efficiency cleaning and utilize; In addition, blast-furnace smelting long flow path, inconvenience controls reduction temperature and reducing atmosphere flexibly, and more difficult control has the migration of valency constituent element to move towards, and makes a low multiple use, and is unfavorable for effectively utilizing the valuable components such as vanadium, titanium and the chromium in high-chromic vanadium titanium ore.
Take into account the basic characteristic of high-chromic vanadium-titanium ferroferrite, how solving the low problem of high-chromic vanadium-titanium ferroferrite blast-furnace smelting flowsheet synthesis utilization ratio has become an important problem.And gas-based shaft kiln directly reducedly have the technical superioritys such as reduction rate is fast, constant product quality, level of automation are high, unit production capacity is large, process energy consumption is low, and gas-based shaft kiln directly reduced technique is extensively successfully applied to the comprehensive utilization of various complicated Metallurgical resources and secondary resource.Therefore, develop a kind of new high-chromic vanadium-titanium ferroferrite gas-based shaft kiln smelting technology the high-efficiency comprehensive utilization in this ore deposit is had great importance.
Summary of the invention
This is for above problem, the invention provides a kind of high-chromic vanadium-titanium ferroferrite gas-based shaft kiln directly reduced-molten point of an induction furnace smelting technology.
In order to realize foregoing invention object, the method that the present invention realizes specifically comprises the following steps:
(1) ball mill is adopted to carry out wet ground to high-chromic vanadium-titanium ferroferrite.High-chromic vanadium-titanium ferroferrite is put into ball mill, after adding water, carries out wet-milling.Maintaining powdered ore quality concentration in wet-milling process is 60-70%, and the fine grinding time is no less than 15min, and powder particle size is not more than 0.074mm, obtained fine grinding v-ti magnetite concentrate powder, is used for pelletizing preparation as raw material; The TFe content of high-chromic vanadium-titanium ferroferrite used is not less than 50%, Cr
2o
3content is not less than 0.3%, V
2o
5content is not less than 0.5%, TiO
2be not less than 5%.
(2) green-ball is prepared.The fine grinding v-ti magnetite concentrate powder of 100%, bentonite adhesive and water are pressed suitable proportion all mixed after, through stewing material, be prepared into the green-ball that granularity is 10 ~ 12.5mm, wherein, the outer proportioning example of bentonite adhesive is not higher than 1.0%, the stewing material time is no less than 40min, and the shatter strength of green pellet of preparation is not less than 4 times, and compression strength of green pellet is not less than 10N.
(3) acid pellet is prepared.Be, under the furnace temperature of 300 DEG C, dried high-chromic vanadium-titanium ferroferrite pelletizing is put into High Temperature Furnaces Heating Apparatus in temperature, and blowing air.Rise to 900 DEG C with 10 DEG C/min, then rise to maturing temperature 1250 ~ 1300 DEG C with 5 DEG C/min, after keeping 20 ~ 25min at such a temperature, discharged by pelletizing and cool, the acid pellet ultimate compression strength obtained is not less than 2500N, and reduction swellability rate is not higher than 20%.
(4) high-chromic vanadium-titanium ferroferrite acid pellet is added laggard row gas-based reduction from shaft furnace furnace roof.Reduction temperature controls 1000 ~ 1100 DEG C, and reducing gas flow is 3 ~ 5m3/m2min, H in reducing gas
2the volume ratio of+CO is not less than 95%, H
2with the mol ratio 1.0 ~ 3.0 of CO, the recovery time is not less than 60min, and the degree of metalization of the metallized pellet obtained through gas base directly reducing is greater than 90%.
(5) molten point of high frequency furnace.Deliver in high frequency furnace by the metallized pellet after reduction, the molten point atmosphere in stove is vacuum or argon gas atmosphere, and controlling molten point temperature is 1700 ~ 1750 DEG C, and molten point time 20 ~ 30min, obtains containing vanadium chromium pig iron and titanium slag.In the pig iron, the grade of iron and recovery rate are all greater than 90%, and vanadium and chromium recovery rate are all higher than 85%; In titanium slag, the grade of TiO2 is about 40%, and recovery rate is at 85-90%.
The advantage of this invention is: adopt gas-based shaft kiln directly reduced-induction furnace to melt division technique and smelt high-chromic vanadium-titanium ferroferrite, improve the deficiency of existing blast furnace smelting process, achieve the clean high efficiency separation of iron, vanadium, titanium, chromium, products obtained therefrom activity is large, recovery rate is high.This technical process is short, is connected compact between each flow process, and each processing parameter is easy to operate and control, and meanwhile, makes full use of non-burnt resource, reduces the dependence to metallurgical coke resource, environmental friendliness, can be used for the high-efficiency cleaning comprehensive utilization of high-chromic vanadium-titanium ferroferrite.
Embodiment
Further describe the present invention below in conjunction with specific embodiment, advantage and disadvantage of the present invention can be more clear in the de-scription, but these embodiments are only exemplary in nature, do not form any restriction to scope of the present invention.
Embodiment one
Certain high-chromic vanadium-titanium ferroferrite and experiment list in table 1 and table 2 respectively by bentonitic chemical composition percentage.
Table 1 high-chromic vanadium-titanium ferroferrite chemical composition (by weight percentage composition)
Table 2 is tested with wilkinite chemical composition (by weight percentage composition)
Implementation step is as follows:
(1) ball mill is adopted to carry out wet ground to high-chromic vanadium-titanium ferroferrite.Fine grinding time 15min, the volume fraction that powder particle size is not more than 0.074mm is 100%, obtained fine grinding v-ti magnetite concentrate powder.
(2) the fine grinding v-ti magnetite concentrate powder of 100%, binding agent wilkinite and water are pressed suitable proportion all mixed after, through stewing material, prepare the high-chromic vanadium-titanium ferroferrite pelletizing green-ball that diameter is 10.0-11.0mmd.
(3) High Temperature Furnaces Heating Apparatus will be put into through dried high-chromic vanadium-titanium ferroferrite pelletizing at 300 DEG C, and blowing air.Rise to 900 DEG C with the heat-up rate of 10 DEG C/min, then rise to maturing temperature 1250 DEG C with 5 DEG C/min, after keeping 20min at such a temperature, pelletizing is discharged and cools obtained high-chromic vanadium-titanium ferroferrite acid pellet;
(4) high-chromic vanadium-titanium ferroferrite acid pellet is delivered to shaft furnace and carry out gas-based reduction.Reduction temperature controls 1000 DEG C, and reducing gas flow is 3 ~ 5m3/m2min, reducing gas H
2the mol ratio 2.5 of+CO=95%, H2 and CO, recovery time 70min.The gas base directly reducing metallized pellet obtained according to this, its degree of metalization 90.13%;
(5) material after reduction is delivered in high frequency furnace carry out molten point of the degree of depth.Controlling molten point temperature is 1700 DEG C, and the molten point time is 20min, obtains containing vanadium chromium pig iron and titanium slag.In the pig iron, the grade of iron reaches 91.09%, and the recovery rate of iron is 92.03%, vanadium recovery rate 85.13%, chromium recovery rate 85.93%; In titanium slag, the grade of TiO2 is that 38.76%, TiO2 recovery rate reaches 88.72%.
Embodiment two
Still with the high-chromic vanadium-titanium ferroferrite in case study on implementation 1 and wilkinite for raw material.
Implementation step is as follows:
(1) ball mill is adopted to carry out wet ground to high-chromic vanadium-titanium ferroferrite.The fine grinding time is 15min, and the volume fraction that powder particle size is not more than 0.074mm is 100%;
(2) the fine grinding v-ti magnetite concentrate powder of 100%, binding agent wilkinite and water are pressed suitable proportion all mixed after, through stewing material, be prepared into the high-chromic vanadium-titanium ferroferrite acid pellet green-ball that granularity is 11.5mm, then dry;
(3) under the furnace temperature of 300 DEG C, dried high-chromic vanadium-titanium ferroferrite pelletizing is put into High Temperature Furnaces Heating Apparatus, and blowing air.Rise to 900 DEG C with 10 DEG C/min, then rise to maturing temperature 1250 DEG C with 5 DEG C/min, after keeping 25min at such a temperature, pelletizing is taken out cooling;
(4) high-chromic vanadium-titanium ferroferrite acid pellet is delivered to shaft furnace and carry out gas-based reduction.Reduction temperature controls 1100 DEG C, and reducing gas flow is 3 ~ 5m3/m2min, reducing gas H
2the mol ratio 1.0 of+CO=96%, H2 and CO, recovery time 60min, the degree of metalization of gas base directly reducing product reaches 92.56%;
(5) material after reduction is delivered in high frequency furnace carry out molten point of the degree of depth.Control molten point temperature 1700 DEG C, molten point time 25min, obtains containing vanadium chromium pig iron and titanium slag.The grade 91.89% of iron in the pig iron, recovery rate 92.97%, vanadium recovery rate 85.68%, chromium recovery rate 88.76%, in titanium slag, the grade of TiO2 is 38.94%, recovery rate 88.93%.
Embodiment three
Still with the high-chromic vanadium-titanium ferroferrite in case study on implementation 1 and wilkinite for raw material.
Implementation step is as follows:
(1) ball mill is adopted to carry out wet ground to high-chromic vanadium-titanium ferroferrite.Fine grinding time 15min, the volume fraction that powder particle size is not more than 0.074mm is 100%;
(2) the fine grinding v-ti magnetite concentrate powder of 100%, wilkinite and water are pressed suitable proportion all mixed after, through stewing material, be prepared into the high-chromic vanadium-titanium ferroferrite acid pellet green-ball that granularity is 12mm, then dry;
(3) oxidizing roasting.At 300 DEG C of temperature, dried high-chromic vanadium-titanium ferroferrite pelletizing is put into High Temperature Furnaces Heating Apparatus, and blowing air, rise to 900 DEG C with 10 DEG C/min, then rise to maturing temperature 1250 DEG C with 5 DEG C/min, after keeping 25min at such a temperature, pelletizing is taken out and cools;
(4) high-chromic vanadium-titanium ferroferrite acid pellet is delivered to shaft furnace and carry out gas-based reduction.Reduction temperature controls 1100 DEG C, and reducing gas flow is 3 ~ 5m3/m2min, reducing gas H
2+ CO=96%, H
2with the mol ratio 2.5 of CO, recovery time 60min, the degree of metalization 95.38% of gas base directly reducing product
(5) material after reduction is delivered in high frequency furnace carry out molten point of the degree of depth.Controlling molten point temperature is 1700 DEG C, and the molten point time is 30min, obtains containing vanadium chromium pig iron and titanium slag.The grade 92.56% of iron in the pig iron, recovery rate 93.76%, vanadium recovery rate 86.87%, chromium recovery rate 89.91%, in titanium slag, the grade of TiO2 reaches 39.74%, and recovery rate is 89.79%.
Claims (1)
1. the gas-based shaft kiln directly reduced smelting process of high-chromic vanadium-titanium ferroferrite, the method is major equipment with shaft furnace, take high-chromic vanadium-titanium ferroferrite as raw material, carries out direct-reduction and produces metallic iron, it is characterized in that adopting and produces with the following method:
(1) high-chromic vanadium-titanium ferroferrite is put into ball mill, after adding water, carry out wet-milling; Maintaining powdered ore quality concentration in wet-milling process is 60-70%, and the fine grinding time is no less than 15min, and powder particle size is not more than 0.074mm, and obtained fine grinding v-ti magnetite concentrate powder, the TFe content of high-chromic vanadium-titanium ferroferrite used is not less than 50%, Cr
2o
3content is not less than 0.3%, V
2o
5content is not less than 0.5%, TiO
2be not less than 5%;
(2) the fine grinding v-ti magnetite concentrate powder of 100%, bentonite adhesive and water are pressed suitable proportion all mixed after, through stewing material, be prepared into the green-ball that granularity is 10 ~ 12.5mm, wherein, the outer proportioning example of bentonite adhesive is not higher than 1.0%, the stewing material time is no less than 40min, and the shatter strength of green pellet of preparation is not less than 4 times, and compression strength of green pellet is not less than 10N;
(3) be, under the furnace temperature of 300 DEG C, dried high-chromic vanadium-titanium ferroferrite pelletizing is put into High Temperature Furnaces Heating Apparatus in temperature, and blowing air, 900 DEG C are risen to 10 DEG C/min, then rise to maturing temperature 1250 ~ 1300 DEG C with 5 DEG C/min, after keeping 20 ~ 25min at such a temperature, discharged by pelletizing and cool, the acid pellet ultimate compression strength obtained is not less than 2500N, and reduction swellability rate is not higher than 20%;
(4) added from shaft furnace furnace roof by high-chromic vanadium-titanium ferroferrite acid pellet, reduction temperature controls 1000 ~ 1100 DEG C, and reducing gas flow is 3 ~ 5m
3/ m
2min, H in reducing gas
2the volume ratio of+CO is not less than 95%, H
2with the mol ratio 1.0 ~ 3.0 of CO, the recovery time is 60 ~ 70min;
(5) deliver in high frequency furnace by the metallized pellet after reduction, the molten point atmosphere in stove is vacuum or argon gas atmosphere, and controlling molten point temperature is 1700 ~ 1750 DEG C, and molten point time 20 ~ 30min, obtains containing vanadium chromium pig iron and titanium slag.
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| CN109136588A (en) * | 2018-10-30 | 2019-01-04 | 东北大学 | A kind of gas-based shaft kiln directly reduced method for producing high titanium slag of ilmenite concentrate |
| CN113846212A (en) * | 2021-09-27 | 2021-12-28 | 攀枝花学院 | Melting separation method for high-chromium vanadium titano-magnetite metalized pellet |
| CN117431397B (en) * | 2023-12-20 | 2024-03-15 | 东北大学 | Reduction method of vanadium titanium ore |
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Application publication date: 20140326 Assignee: LIAONING HUAXIN STEEL GENERAL CHARACTER TECHNOLOGY INNOVATION TECHNOLOGY Co.,Ltd. Assignor: Northeastern University Contract record no.: 2018210000019 Denomination of invention: Gas-based shaft-furnace direct-reduction smelting method for high-chromium-content vanadium-titanium magnetite Granted publication date: 20151202 License type: Common License Record date: 20180828 |
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