CN115896367A - Blast furnace smelting method of vanadium titano-magnetite - Google Patents
Blast furnace smelting method of vanadium titano-magnetite Download PDFInfo
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- 238000003723 Smelting Methods 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 57
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 229910052720 vanadium Inorganic materials 0.000 title claims abstract description 27
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 title claims abstract description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 212
- 229910052742 iron Inorganic materials 0.000 claims abstract description 103
- 239000002994 raw material Substances 0.000 claims abstract description 40
- 239000000203 mixture Substances 0.000 claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 22
- 238000010079 rubber tapping Methods 0.000 claims abstract description 11
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 23
- 229910052748 manganese Inorganic materials 0.000 claims description 23
- 239000011572 manganese Substances 0.000 claims description 23
- 239000008188 pellet Substances 0.000 claims description 16
- 239000002893 slag Substances 0.000 abstract description 90
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 abstract description 15
- 229910052799 carbon Inorganic materials 0.000 abstract description 14
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 14
- 241001062472 Stokellia anisodon Species 0.000 abstract description 9
- 238000001179 sorption measurement Methods 0.000 abstract description 7
- 238000009825 accumulation Methods 0.000 abstract description 5
- 239000010936 titanium Substances 0.000 description 32
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 26
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 description 15
- 238000006722 reduction reaction Methods 0.000 description 14
- 230000008569 process Effects 0.000 description 12
- 230000009467 reduction Effects 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 9
- 230000001276 controlling effect Effects 0.000 description 9
- 239000011324 bead Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 239000012071 phase Substances 0.000 description 7
- 238000007599 discharging Methods 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 239000007790 solid phase Substances 0.000 description 6
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 6
- MRHSJWPXCLEHNI-UHFFFAOYSA-N [Ti].[V].[Fe] Chemical compound [Ti].[V].[Fe] MRHSJWPXCLEHNI-UHFFFAOYSA-N 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 229910052719 titanium Inorganic materials 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 229910010413 TiO 2 Inorganic materials 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 229910052984 zinc sulfide Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052840 fayalite Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000008262 pumice Substances 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses a blast furnace smelting method of vanadium titano-magnetite, relates to the technical field of blast furnace smelting, solves the problem of serious iron loss of the existing blast furnace smelting method of vanadium titano-magnetite, and comprises the following steps: s1, providing a smelting raw material composition; s2, taking materials according to the raw material composition of the S1, and putting the materials into a blast furnace for distributing to obtain a furnace charge structure; and S3, adjusting a smelting thermal system to smelt and tapping according to preset time to obtain a finished product, adjusting the composition of the raw materials, introducing elements for increasing the fluidity of the slag, improving the capability of the slag to discharge Ti C and TiN, reducing the accumulation of Ti C and TiN in the slag, and reducing the adsorption of dispersed Ti (C, N) and iron, so that the slag and the iron can be smoothly separated, the loss of the iron in the finished product is effectively reduced, and a more suitable environment is provided for the fluidity of the slag by adjusting the smelting thermal system, so that the loss of the iron in the finished product is further reduced.
Description
Technical Field
The invention relates to the technical field of blast furnace smelting, in particular to a blast furnace smelting method of vanadium-titanium magnetite.
Background
The vanadium titano-magnetite is a symbiotic composite ore containing multiple valuable elements such as iron, vanadium, titanium and the like, is also an important vanadium and titanium resource, and is a mineral resource widely distributed in the world. The vanadium titano-magnetite is also one of the accepted refractory ores in the world, the comprehensive utilization difficulty is high, but the smelting cost is lower than that of common ore smelting, and the comprehensive utilization rate is higher.
The smelting melting point of the vanadium titano-magnetite is 50-100 ℃ higher than that of common ore, and if the melting point temperature is not reached, the fluidity is lost; in addition, tiO2 in the slag is reduced into TiC and TiN, exists in the slag as a solid phase and is dispersed, so that the slag is thickened and loses fluidity, and the vanadium-titanium ore smelting grade is low, and the slag quantity is large, so that the iron loss is large. The iron loss in the smelting process of the common ore is 0.5 to 2 percent, the TFe content in the slag is 0.5 to 1 percent, and the TFe content in the vanadium titano-magnetite smelting slag is 2.5 to 4.5 percent.
Therefore, the existing blast furnace smelting method of vanadium titano-magnetite has the problem of serious iron loss, and the invention designs a blast furnace smelting method of vanadium titano-magnetite aiming at the problem.
Disclosure of Invention
The invention aims to: in order to solve the problem of serious iron loss of the existing blast furnace smelting method of vanadium-titanium magnetite, the invention provides a blast furnace smelting method of vanadium-titanium magnetite, which improves the capability of discharging Ti C and TiN from the slag, reduces the accumulation of Ti C and TiN in the slag and reduces the adsorption of dispersed Ti (C, N) and iron by adjusting the composition of raw materials and introducing elements for increasing the fluidity of the slag, so that the slag iron can be smoothly separated, thereby effectively reducing the loss of iron in finished products and controlling the loss of iron from the source; furthermore, a more suitable environment is provided for the fluidity of the slag by adjusting the thermal system of smelting, so that the loss of iron in the finished product is further reduced; realizes the blast furnace smelting method of the vanadium titano-magnetite.
The invention specifically adopts the following technical scheme for realizing the purpose:
a blast furnace smelting method of vanadium titano-magnetite comprises the following steps: s1, providing a smelting raw material composition; s2, taking materials according to the raw material composition of the S1, and putting the materials into a blast furnace for distributing to obtain a furnace charge structure; and S3, adjusting a smelting thermal system to smelt and tapping according to preset time to obtain a finished product.
Optionally, the smelting raw materials comprise 50-58% of manganese-containing sintered ore, 38-45% of pellet ore and 5-15% of raw ore.
Optionally, 0.55-0.75% MnO may be contained in each of said manganese-containing sintered ore.
Optionally, the step of adjusting the smelting heat schedule in S3 includes controlling the content of [ Ti ] + [ Si ] in the molten iron to be 0.25% -0.4%.
Optionally, the adjusting of the smelting heat system in S3 includes setting the furnace temperature to 1430-1500 ℃. Compared with the prior art, the invention has the advantages that:
1. according to the blast furnace smelting method of the vanadium titano-magnetite, disclosed by the invention, the raw material composition is adjusted, elements for increasing the fluidity of the slag are introduced, the capability of discharging Ti C and TiN from the slag is improved, the accumulation of the Ti C and TiN in the slag is reduced, the adsorption of dispersed Ti (C, N) and iron is reduced, and the slag and the iron can be smoothly separated, so that the loss of the iron in a finished product is effectively reduced, and the loss of the iron is controlled from the source; furthermore, a more suitable environment is provided for the fluidity of the slag by adjusting the thermal system of smelting, thereby further reducing the loss of iron in the finished product; therefore, the method controls the loss of iron through multiple dimensions, and solves the problem of serious iron loss in the existing method for smelting vanadium-titanium magnetite by using a blast furnace.
2. The invention relates to a blast furnace smelting method of vanadium-titanium magnetite, which can change the components of slag by adjusting the composition of smelting raw materials, so that the content of MnO in the slag is 1.0-1.5%, the content of MnO in the slag is increased, the fluidity of the slag can be changed, the fluidity of the slag is increased, and TiO in the slag 2 The reduced TiC and TiN exist in a solid phase, so that the fluidity of the slag is increased, the capability of the slag for discharging Ti C and TiN can be improved, the adsorption of dispersed Ti (C, N) and iron is reduced, the slag and the iron can be smoothly separated, and the loss of iron in a finished product is reduced.
3. The invention relates to a blast furnace smelting method of vanadium titano-magnetite, and the smelting raw materials of the invention comprise, by mass, 52-58 parts of manganese-containing sintered ore, 5-10 parts of pellet ore and 10-12 parts of raw ore. The ratio of the sintering ore to the pellet ore as raw materials is called as clinker ratio. It can be seen that in the invention, the clinker ratio is more than 94%, and the increase of the clinker ratio is beneficial to improving the loss of iron. The main reason is that clinker reducibility is better than that of raw materials, direct reduction of ores is endothermic reaction, indirect reduction is exothermic reaction, and released heat participates in the blast furnace smelting process, so that heat loss is reduced, sufficient furnace temperature is ensured, increase of slag viscosity is avoided, fluidity of slag is improved, and the coke ratio can be reduced by 6-7kg/t after the clinker ratio is increased, so that the production cost is reduced, and the advantages are achieved.
Drawings
FIG. 1 is a schematic flow diagram of a blast furnace smelting method of vanadium titano-magnetite.
FIG. 2 is a schematic diagram of the equilibrium gas phase composition of CO reduced iron oxide at different temperatures.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments.
Thus, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
Detailed Description
The main reason why the loss of the vanadium titano-magnetite iron smelting is high
(1) The reduction of the titanium oxide is stepwise reduction, and the reduction sequence is as follows:
Ti0 2 —Ti 3 O 5 —Ti 2 O 3 —TiO—Ti
the titanium suboxide reacts directly only with C:
Ti 2 O 3 +C＝2Ti0+CO
TiO+C＝Ti+CO
the reaction is carried out at elevated temperatures. However, ti has high activity at high temperature, and then undergoes a combination reaction with C and N2:
Ti0 2 +3C＝TiC+2C0
Ti+C＝TiC
Ti0 2 +2C+1/2N 2 ＝TiN+2C0
Ti+1/2N 2 ＝TiN
ti (C, N) compounds generated by the reduced Ti have very high melting points (2900-3000 ℃), are high-density dispersed solid-phase substances and have good wettability with molten slag, so that the viscosity of the molten slag is increased, and meanwhile, dispersed Ti (C, N) generated by over-reduction is adsorbed on small iron beads, so that the surface tension of the iron beads is increased, the small iron beads are difficult to polymerize and grow, a large amount of dispersed small iron beads exist in the slag, the slag and iron are difficult to separate, and iron loss in the smelting process is caused.
(2) Because schreyerite contains higher TiO2, the charged grade is lower than that of common ore smelting, so that the iron slag quantity per ton is high, and the iron loss is higher as the slag quantity is larger.
(3) Temperature should affect iron loss: the influence of furnace temperature on slag viscosity causes iron loss: the viscosity of the slag decreases with increasing temperature, and the viscosity of most slags follows the arrhenius relationship:
in the formula (1), A η Is a constant; e η Activation energy for viscous flow.
Therefore, in the vanadium-titanium ore smelting process, when the furnace temperature is too high, the viscosity of the furnace slag is reduced, the flow property is poor, and the slag-iron separation effect is poor, so that the iron amount taken away by the furnace slag is increased, and the iron loss in the smelting process is caused;
when the furnace temperature is low, fe in the ore x O is not sufficiently oxidized and reduced, fe x O is Fe of cubic sodium chloride type 2+ The missing crystal is known as wurtzite (wurtzite) and is usually designated as FeO. It can be known from the equilibrium gas phase composition diagram (see fig. 2) of CO reduced iron oxide at different temperatures that CO is used as a reducing agent, when the temperature is lowered, the volume fraction of CO in the gas phase must be increased along with the temperature decrease, and the generation of CO is an exothermic reaction and has a positive correlation with the temperature, so that when the temperature is lowered, the volume fraction of CO in the gas phase must be decreased, so that it cannot be ensured that FeO is reduced to Fe, and the part of FeO that is not completely reduced enters the slag, resulting in iron loss.
Therefore, referring to fig. 1, the present invention provides a blast furnace smelting method of vanadium titano-magnetite, which comprises the following steps: s1, providing a smelting raw material composition; s2, taking materials according to the raw material composition in the S1 and putting the materials into a blast furnace for distributing to obtain a furnace charge structure; and S3, adjusting a smelting thermal system to smelt and tapping according to preset time to obtain a finished product.
The raw material composition is adjusted, elements for increasing the fluidity of the slag are introduced, the capability of the slag for discharging Ti C and TiN is improved, the accumulation of the Ti C and TiN in the slag is reduced, the adsorption of dispersed Ti (C, N) and iron is reduced, and the slag and the iron can be smoothly separated, so that the loss of the iron in a finished product is effectively reduced, and the loss of the iron is controlled from the source; furthermore, a more suitable environment is provided for the fluidity of the slag by adjusting the thermal system of smelting, thereby further reducing the loss of iron in the finished product; therefore, the method controls the loss of iron through multiple dimensions, and solves the problem of serious iron loss in the existing method for smelting vanadium-titanium magnetite by using a blast furnace.
In some embodiments of the invention, the raw material composition for smelting comprises 50-58% of manganese-containing sintered ore, 38-45% of pellet ore and 5-15% of raw ore.
Specifically, the smelting raw materials comprise 50% of manganese-containing sintered ore, 38% of pellet ore and 5% of raw ore.
Specifically, the raw material composition for smelting comprises 55% of manganese-containing sintered ore, 40% of pellet ore and 10% of raw ore.
Specifically, the smelting raw materials comprise 58% of manganese-containing sintered ore, 45% of pellet ore and 15% of raw ore.
In some embodiments of the invention, 0.55-0.75% MnO is contained per part of the manganese-containing sintered ore.
Specifically, the manganese-containing sintered ore contains 0.65% MnO per part thereof.
It will be appreciated that adjusting the composition of the smelt feed material can alter the slag composition so that the MnO content of the slag is between 1.0 and 1.5%, increasing the MnO content of the slag can alter the slag fluidity, increase the slag fluidity, tiO in the slag 2 The reduced TiC and TiN exist in a solid phase, so that the fluidity of the slag is increased, the capability of the slag for discharging TiC and TiN can be improved, the adsorption of dispersed Ti (C, N) and iron is reduced, the slag and the iron can be smoothly separated, and the loss of iron in a finished product is reduced.
Further elaborating specifically, because the reduction processes of the manganese oxide are all exothermic reactions and the thermal effect value is large, the furnace temperature can be increased in the smelting process, and the probability of over-low furnace temperature in the production process is reduced. Meanwhile, the content of slag MnO is increased in the smelting process, the slag MnO can increase the oxygen formula of the slag and inhibit TiO 2 The fayalite with lower melting point is generated by over-reduction, the melting temperature of the slag is reduced, and the slag is kept in a uniform liquid state in a wider range. Thereby making it possible toThe reduction ratio of FeO is increased, the fluidity of the slag is improved, and the iron loss in the smelting process is reduced.
In addition, the raw material composition for smelting comprises, by mass, 52-58 parts of manganese-containing sintered ore, 5-10 parts of pellet ore and 10-12 parts of raw ore. The proportion of the materials fed into the furnace from the sinter and pellet stations is called as clinker ratio. In the invention, the clinker ratio is more than 94%, and the increase of the clinker ratio is beneficial to improving the loss of iron.
Understandably, the main reason is that clinker reducibility is better than that of raw materials, direct reduction of ores is endothermic reaction, indirect reduction is exothermic reaction, released heat participates in the blast furnace smelting process, heat loss is reduced, sufficient furnace temperature is ensured, increase of slag viscosity is avoided, fluidity of slag is improved, and simultaneously, the clinker ratio can be reduced by 6-7kg/t after being increased, so that production cost is reduced, and the method has superiority.
In some embodiments of the present invention, the manganese-containing sintered ore comprises, in parts by mass: 47 to 49.5 percent of TFe, 7 to 10 percent of FeO and SiO 2 5～7％，TiO 2 4～7％，V 2 O 5 0.2～1％，MnO 0.55～0.75％。
In some embodiments of the present invention, the pellet comprises, in parts by mass: 52 to 55 percent of TFe, 1 to 2 percent of FeO and SiO 2 4～6％，TiO 2 10～12％，V 2 O 5 0.4 to 1 percent of water and 0.01 to 3.6 percent of water.
In some embodiments of the invention, the green ore comprises, in parts by mass: TFe 50-56%, siO 2 12～16％，TiO 2 0.4 to 0.8 percent of water and 2 to 3 percent of water.
In some embodiments of the present invention, the adjusting the thermal schedule of the smelting in S3 includes controlling the content of [ Ti ] + [ Si ] in the molten iron to be 0.25% to 0.4%.
Specifically, in some embodiments of the present invention, the adjusting the thermal profile of the smelting in S3 includes controlling the content of [ Ti ] + [ Si ] in the molten iron to be 0.3%.
Understandably, ti (C, N) compounds generated by reduction reaction of Ti and Ti generated by C, N have very high melting points (2900-3000 ℃), and are high-density dispersed solid phase substances, the Ti (C, N) compounds have very good wettability with slag, so that the viscosity of the slag is increased, and dispersed Ti (C, N) generated by over-reduction is adsorbed on small iron beads, so that the surface tension of the iron beads is increased, the small iron beads are difficult to polymerize and grow, a large amount of dispersed small iron beads exist in slag, the separation of slag and iron is difficult, and iron loss in the smelting process is caused. Therefore, the probability of generating solid phase substances by Ti, carbon and nitrogen can be reduced by reducing the content of [ Ti ] + [ Si ] in the molten iron, thereby reducing the iron loss from the source.
Furthermore, the content of Si in the molten iron is reduced, and compared with the common smelting, the smelting grade of the molten iron is increased, so that the quantity of the iron slag per ton is reduced, and the iron loss is correspondingly reduced as the quantity of the iron slag is larger.
In some embodiments of the present invention, the adjusting the thermal profile of the smelting in S3 includes setting the furnace temperature to 1430-1500 ℃.
Specifically, in some embodiments of the present invention, the adjusting the thermal profile of the smelting in S3 includes setting the furnace temperature to 1450 ℃.
It is understood that the viscosity of most slags is related to temperature by the arrhenius relationship:
in the formula (1), A η Is a constant; e η Activation energy for viscous flow.
Therefore, in the vanadium-titanium ore smelting process, when the furnace temperature is too high, the viscosity of the furnace slag is reduced, the flowing property is poor, the slag-iron separation effect is poor, the iron amount taken away by the furnace slag is increased, and the iron loss in the smelting process can be caused;
when the furnace temperature is low, fe in the ore x O is not sufficiently oxidized and reduced, fe x O is Fe in the form of cubic sodium chloride 2+ The missing crystal, known by the chemical name wurtzite (pumice), is commonly referred to as FeO. As can be seen from the equilibrium gas phase composition diagram (see FIG. 1) of iron oxide reduced by CO at different temperatures, when the temperature is lowered, the reduction of FeO into Fe and gas is ensured by using CO as a reducing agentThe volume fraction of CO in the phase must increase with decreasing temperature, and the formation of CO is an exothermic reaction, which is positively correlated with temperature, so that when the temperature decreases, the volume fraction of CO in the gas phase inevitably decreases, which cannot ensure that FeO is reduced to Fe, and the part of FeO which is not completely reduced enters the slag, resulting in iron loss.
Therefore, the furnace temperature is set to be 1430-1500 ℃, and the loss of iron is effectively reduced.
In some embodiments of the invention, the preset time is adjusted according to the blast furnace equipment used, so as to reduce the stay time of the iron slag in the furnace as much as possible, weaken the condition that the slag becomes viscous and reduce the iron loss.
In addition, in some embodiments of the present invention, in the production process, the production management is enhanced, and specific measures are as follows:
(1) raw fuel control
The quality and the charging system of the raw fuel are required to be checked before each shift of the blast furnace worker, the change of water content and the powder content are concerned, and the raw fuel is reported and processed immediately when abnormality is found, so that the production efficiency and the quality of each shift are stabilized, and favorable conditions are created for blast furnace enhanced smelting, thereby avoiding the problem of iron loss increase caused by overhigh or overlow furnace temperature.
(2) Production rhythm control
After the smelting intensity of the blast furnace is improved, the material flow speed of charging materials and tapping iron slag is accelerated, the factory requires a blast furnace workshop to strictly control the iron interval time of each furnace, the tapping interval of a single iron notch of a small blast furnace is less than 30 minutes, the interval time of double iron notches of a large blast furnace is less than 15 minutes, the staying time of the iron slag in the furnace is reduced, the condition that the slag becomes viscous is weakened, and the iron loss is reduced.
Example 1
When smelting vanadium-titanium-iron ore, blast furnace smelting is carried out according to the following method for reducing the iron loss of vanadium-titanium magnetite smelting in a blast furnace, and the method specifically comprises the following steps: the method comprises the following steps:
s1, providing a smelting raw material composition; the raw material composition of smelting includes 50% of manganese-containing sintered ore, 38% of pellet ore and 5% of raw ore. 0.55% MnO per part of said manganese-containing sintered ore
S2, taking materials according to the raw material composition in the S1 and putting the materials into a blast furnace for distributing to obtain a furnace charge structure; controlling the content of [ Ti ] + [ Si ] in the molten iron to be 0.3%; setting the furnace temperature at 1450 ℃; .
And S3, adjusting a smelting thermal system to smelt and tapping according to preset time to obtain a finished product.
Example 2
When smelting vanadium-titanium-iron ore, blast furnace smelting is carried out according to the following method for reducing the iron loss of vanadium-titanium magnetite smelting in a blast furnace, and the method specifically comprises the following steps: the method comprises the following steps:
s1, providing a smelting raw material composition; the raw material composition of the smelting comprises 55% of manganese-containing sintered ore, 40% of pellet ore and 10% of raw ore. 0.60% MnO was contained in each of the manganese-containing sintered ores.
S2, taking materials according to the raw material composition of the S1, and putting the materials into a blast furnace for distributing to obtain a furnace charge structure; controlling the content of [ Ti ] + [ Si ] in the molten iron to be 0.3%; setting the furnace temperature to 1430 ℃; .
And S3, adjusting a smelting thermal system to smelt and tapping according to preset time to obtain a finished product.
Example 3
When smelting vanadium-titanium-iron ore, blast furnace smelting is carried out according to the following method for reducing the iron loss of the vanadium-titanium magnetite in the blast furnace smelting, and the method specifically comprises the following steps: the method comprises the following steps:
s1, providing a smelting raw material composition; the smelting raw materials comprise, by mass, 58% of manganese-containing sintered ore, 45% of pellet ore and 15% of raw ore. 0.75% MnO per part of the manganese-containing sintered ore.
S2, taking materials according to the raw material composition of the S1, and putting the materials into a blast furnace for distributing to obtain a furnace charge structure; controlling the content of Ti + Si in the molten iron to be 0.3%; setting the furnace temperature to 1500 ℃; .
And S3, adjusting a smelting thermal system to smelt and tapping according to preset time to obtain a finished product.
Example 4
When smelting vanadium-titanium-iron ore, blast furnace smelting is carried out according to the following method for reducing the iron loss of vanadium-titanium magnetite smelting in a blast furnace, and the method specifically comprises the following steps: the method comprises the following steps:
s1, providing a smelting raw material composition; the smelting raw materials comprise, by mass, 50% of manganese-containing sintered ore, 38% of pellet ore and 5% of raw ore. Each portion of the manganese-containing sintered ore contains 0.55% MnO.
S2, taking materials according to the raw material composition of the S1, and putting the materials into a blast furnace for distributing to obtain a furnace charge structure; controlling the content of Ti + Si in the molten iron to be 0.3%; setting the furnace temperature to 1480 ℃; .
And S3, adjusting a smelting thermal system to smelt and tapping according to preset time to obtain a finished product.
Example 5
When smelting vanadium-titanium-iron ore, blast furnace smelting is carried out according to the following method for reducing the iron loss of vanadium-titanium magnetite smelting in a blast furnace, and the method specifically comprises the following steps: the method comprises the following steps:
s1, providing a smelting raw material composition; the smelting raw materials comprise, by mass, 55% of manganese-containing sintered ore, 40% of pellet ore and 10% of raw ore. 0.55% MnO per part of said manganese-containing sintered ore
S2, taking materials according to the raw material composition in the S1 and putting the materials into a blast furnace for distributing to obtain a furnace charge structure; controlling the content of [ Ti ] + [ Si ] in the molten iron to be 0.3%; setting the furnace temperature at 1490 ℃; .
And S3, adjusting a smelting thermal system to smelt and tapping according to preset time to obtain a finished product.
After the viscosity of the slag is improved, the fluidity of the slag is increased and the reduction ratio of FeO is increased by the method, the content of TFe in the slag of the examples 1 to 5 is reduced from 1.5 percent to about 0.75 percent, and the economic benefit of 265 ten thousand ton iron scale enterprises of the enterprise for reducing the iron loss by 1.232 ten thousand tons (the slag ratio is 0.62 t/t.Fe) reaches 4312 ten thousand yuan/year (the pig iron cost is calculated according to 3500 yuan/ton).
In conclusion, according to the blast furnace smelting method of the vanadium titano-magnetite, disclosed by the invention, the raw material composition is adjusted, elements for increasing the slag fluidity are introduced, the capability of discharging Ti C and TiN from the slag is improved, the accumulation of the Ti C and TiN in the slag is reduced, the adsorption of dispersed Ti (C, N) and iron is reduced, and the slag and the iron can be smoothly separated, so that the loss of the iron in a finished product is effectively reduced, and the loss of the iron is controlled from the source; furthermore, a more suitable environment is provided for the fluidity of the slag by adjusting the thermal system of smelting, thereby further reducing the loss of iron in the finished product; therefore, the method controls the loss of iron through multiple dimensions, solves the problem of serious iron loss in the existing method for smelting vanadium-titanium magnetite in a blast furnace, saves the production cost and increases the economic benefit.
The above embodiment is only one embodiment of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (5)
1. A blast furnace smelting method of vanadium titano-magnetite is characterized by comprising the following steps: s1, providing a smelting raw material composition; s2, taking materials according to the raw material composition of the S1, and putting the materials into a blast furnace for distributing to obtain a furnace charge structure; and S3, adjusting a smelting thermal system to carry out smelting and tapping according to preset time to obtain a finished product.
2. The blast furnace smelting method of vanadium titano-magnetite according to claim 1, characterized in that: the raw material composition of the smelting comprises 50-58% of manganese-containing sintered ore, 38-45% of pellet ore and 5-15% of raw ore.
3. The blast furnace smelting method of vanadium titano-magnetite according to claim 2, characterized in that: 0.55 to 0.75% by weight of MnO per part of said manganese-containing sintered ore.
4. The blast furnace smelting method of vanadium titano-magnetite according to claim 1, characterized in that: and the step S3 of adjusting the smelting heat system comprises the step of controlling the content of [ Ti ] + [ Si ] in the molten iron to be 0.25-0.4%.
5. The blast furnace smelting method of vanadium titano-magnetite according to claim 1, characterized in that: and the step 3 of adjusting the smelting heat system comprises setting the furnace temperature to 1430-1500 ℃.
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