CN111041240A - Method for preparing ferrotitanium alloy by using perovskite concentrate as raw material - Google Patents
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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
- C22B34/00—Obtaining refractory metals
- C22B34/10—Obtaining titanium, zirconium or hafnium
- C22B34/12—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08
- C22B34/1218—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08 obtaining titanium or titanium compounds from ores or scrap by dry processes
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- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
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- C21B13/006—Starting from ores containing non ferrous metallic oxides
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
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- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B5/00—General methods of reducing to metals
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- C22B5/04—Dry methods smelting of sulfides or formation of mattes by aluminium, other metals or silicon
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Abstract
A method for preparing ferrotitanium by taking perovskite concentrate as a raw material comprises the following steps: (1) ball milling the perovskite concentrate to prepare perovskite concentrate powder; (2) mixing the perovskite concentrate powder, aluminum powder and scrap iron uniformly, and pressing into pellets; (3) placing the pellets in a reduction furnace, heating to 800-1250 ℃ under a vacuum condition or an inert atmosphere condition for reduction to form a reduced material; (4) carrying out high-temperature melting separation on the reduced material; or adding into molten iron and stirring; or cooling the molten iron along with the furnace, and then ball-milling the molten iron to prepare powder which is blown into the molten iron through a spray gun; the ferrotitanium element forms ferrotitanium alloy melt; (5) pouring out the molten slag; adding the residual materials into molten iron or scrap iron, and then casting or directly casting. The method has the advantages of high titanium recovery rate, short process flow, low cost and strong operability.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for preparing ferrotitanium by taking perovskite concentrate as a raw material.
Technical Field
The perovskite is a titanium-containing mineral with industrial application value, the global reserve exceeds two hundred million tons, the perovskite concentrate is mainly obtained by adopting a mineral separation mode at present, and then sulfuric acid process titanium white is produced by sulfuric acid leaching; however, perovskite is associated with other ores, so that the purity is low and the utilization rate is low.
The vanadium titano-magnetite in Panxi region can also generate a large amount of perovskite after blast furnace ironmaking, and TiO in the titanium-containing blast furnace slag2The content can reach more than 20 percent, and the titanium component mainly exists in a perovskite form, so the titanium-titanium composite material has good application value. Patents CN106048108A, CN106755658A, CN106755652A, etc. disclose methods for extracting iron, enriching perovskite and obtaining perovskite concentrate after melting reduction or oxidation of titaniferous slag, which lay the foundation for comprehensive utilization of vanadium titano-magnetite and titaniferous slag. The titaniferous slag can obtain a large amount of TiO after being subjected to smelting reduction treatment or oxidation2The perovskite concentrate with the content of more than 40 percent still has a problem to be solved at present how to efficiently utilize the perovskite concentrate and improve the economic benefit.
Disclosure of Invention
The invention aims to provide a method for preparing ferrotitanium by taking perovskite concentrate as a raw material.
The method of the invention is carried out according to the following steps:
(1) ball-milling the perovskite concentrate until the particle size is less than or equal to 0.075mm to prepare perovskite concentrate powder;
(2) mixing the perovskite concentrate powder, aluminum powder and scrap iron uniformly, and then pressing into pellets; wherein the particle size of the aluminum powder is less than or equal to 0.075mm and accounts for 16-26% of the total mass of the pellet; the particle size of the scrap iron is less than or equal to 1mm and accounts for 5-20% of the total mass of the pellet;
(3) placing the pellets in a reduction furnace, heating the pellets to 800-1250 ℃ for reduction under the vacuum condition or inert atmosphere condition, wherein the reduction time is 3-10 h, titanium oxide is reduced into metallic titanium by aluminum in the pellets, the metallic titanium and iron in the pellets form ferrotitanium alloy and are gathered into particles due to relatively low melting point, and the generated aluminum oxide reacts with calcium oxide to generate calcium aluminate; forming a reducing material in the reducing furnace after the reduction is finished;
(4) heating the reduced material to 1300-1550 ℃ under a vacuum condition or an inert atmosphere condition for high-temperature melting separation, stirring the reduced material during high-temperature melting separation, stopping the vacuum condition or the inert atmosphere condition after the reduced material is completely melted, forming a ferrotitanium alloy melt and slag and layering the ferrotitanium element and other materials respectively, wherein the ferrotitanium alloy melt is called the high-temperature melting separated ferrotitanium alloy melt; or adding a reducing material into molten iron with the temperature of more than or equal to 1400 ℃, wherein the mass ratio of the reducing material to the molten iron is 1 (0.2-0.6), uniformly mixing all the materials by stirring, and forming a ferrotitanium alloy melt and slag and layering the ferrotitanium element and the rest materials respectively, wherein the ferrotitanium alloy melt is called the ferrotitanium melt of the mixed molten iron; or the reducing material is cooled to the temperature of less than or equal to 50 ℃ along with the furnace, and then ball-milled until the grain diameter is less than or equal to 0.075mm, so as to prepare reducing powder; when the outlet of the spray gun is positioned at the bottom of molten iron, spraying reduced powder into the molten iron through the spray gun, wherein the temperature of the molten iron is more than or equal to 1500 ℃, and the mass ratio of the reduced material to the molten iron is 1 (0.2-0.6), ferrotitanium in the reduced powder is melted in the molten iron, all the materials are uniformly mixed through stirring, the ferrotitanium and other materials respectively form ferrotitanium alloy melt and slag and are layered, and the ferrotitanium alloy melt is called sprayed and mixed ferrotitanium melt;
(5) stopping stirring, pouring out the upper layer of molten slag, and cooling the molten slag to normal temperature to obtain calcium aluminate slag; when the residual material is ferrotitanium melt which is melted at high temperature, adding molten iron or waste iron, stirring and mixing uniformly under the condition that the temperature is kept to melt all the materials, and then casting to prepare ferrotitanium cast ingots, wherein the adding amount of the molten iron or the waste iron is added according to the components of the ferrotitanium cast ingots; when the residual material is ferrotitanium melt of mixed molten iron or the mixed ferrotitanium melt is blown, casting to prepare ferrotitanium cast ingot.
The perovskite concentrate contains TiO according to mass percentage230～60％。
In the method, the pressure for pressing the pellets is 40-200 MPa.
In the above method, the vacuum condition means a degree of vacuum of 100Pa or less.
In the method, the inert atmosphere condition refers to an argon atmosphere condition, and the argon pressure is 0.05-0.5 MPa.
In the above method, when calcium aluminate is produced in the step (3), part of the calcium aluminate reacts with silicate to produce calcium aluminosilicate.
In the above process, when the perovskite concentrate powder contains iron oxide, the iron oxide is reduced by aluminium in step (3) and the resulting metallic iron enters the ferrotitanium melt in step (5).
In the method, the perovskite concentrate contains magnesium aluminate spinel components, wherein magnesium oxide is reduced in the step (3), and generated magnesium metal escapes; when titanium oxide reacts with aluminum to generate titanium suboxide, metal magnesium reacts with the titanium suboxide to generate magnesium oxide and metal titanium; during the repeated oxidation-reduction process of magnesium element, the reduction of titanium oxide is promoted, and finally the titanium oxide escapes in the form of simple substance magnesium and is crystallized outside the reduction furnace.
The reducing material is a lump material.
In the above method, the reaction formula of the reduction reaction in step (3) is:
Al+CaTiO3+Fe→5CaO·3Al2O3+12CaO·7Al2O3+Ti-Fe (1)、
Al+CaTiO3+Fe2O3→5CaO·3Al2O3+12CaO·7Al2O3+Ti-Fe (2)、
Al+CaTiO3+MgO·Al2O3→5CaO·3Al2O3+12CaO·7Al2O3+Mg (3)、
Al+CaTiO3+MgO·SiO2→5CaO·3Al2O3+12CaO·7Al2O3+CaO·Al2O3·2SiO2+ Mg (4) and
Mg+CaTiO3+Fe→CaO+MgO+Ti-Fe (5)。
the ferrotitanium cast ingot contains 50-80% of Ti by mass percent.
In the step (2), perovskite concentrate powder, aluminum powder, scrap iron and fluorite are uniformly mixed and then pressed into pellets; the fluorite has a particle size of less than or equal to 0.075mm and contains CaF according to mass percent2More than or equal to 90 percent; fluorite is 1-3% of the total mass of the perovskite concentrate powder, the aluminum powder and the scrap iron.
In the above method, when the perovskite concentrate powder, the aluminum powder, the iron pieces and the fluorite are uniformly mixed in the step (2), when the reduction is performed in the step (3), the main reaction formulas which occur in addition to the aforementioned reaction formulas (1) to (5) are:
Al+CaTiO3+Fe+CaF2→5CaO·3Al2O3+11CaO·CaF2·7Al2O3+Ti-Fe (6)、
Al+CaTiO3+Fe2O3+CaF2→5CaO·3Al2O3+11CaO·CaF2·7Al2O3+ Ti-Fe (7) and
Al+CaTiO3+MgO·Al2O3+CaF2→5CaO·3Al2O3+11CaO·CaF2·7Al2O3+Mg (8)。
in the step (4), the high-temperature melting separation is directly carried out in the reduction furnace in the step (3) or is transferred to other induction furnaces or intermediate frequency furnaces for carrying out; when the materials are transferred to other induction furnaces or intermediate frequency furnaces for carrying out the process, the materials in the reduction furnace are firstly cooled along with the furnace under the vacuum condition or the inert atmosphere condition until the temperature is less than or equal to 100 ℃, and then the materials are transferred to other induction furnaces or intermediate frequency furnaces to prevent titanium and iron from being oxidized.
In the step (4), when the reduced powder is injected into the molten iron through the lance, the injection amount is based on the condition that the fluctuation of the molten iron liquid level is not caused, and the solidification of titanium and iron is prevented by external heating.
The perovskite concentrate is formed by smelting reduction or oxidation of titanium-containing blast furnace slag and/or titanium-containing molten steel slag and extraction of iron, or is formed by directly adopting natural perovskite or is formed by ore dressing of natural perovskite.
The calcium aluminate slag mainly comprises 5CaO 3Al2O3And 12CaO 7Al2O3And additionally contains a small amount of CaO & Al2O3、CaO·Al2O3·2SiO2、CaO·TiO2And titanium suboxide.
In the step (2), when the perovskite concentrate powder, the aluminum powder, the scrap iron and the fluorite are uniformly mixed and then pressed into pellets, the main component of the calcium aluminate slag obtained in the step (5) is 5CaO 3Al2O3And 11 CaO. CaF2·7Al2O3。
The method takes the perovskite concentrate as a raw material, adopts an aluminothermic reduction method, prepares the ferrotitanium alloy through reduction and melting separation, and the reaction is carried out in vacuum or inert atmosphere, so that the ferrotitanium alloy obtained by reduction has low oxygen content, the recovery rate of titanium in the perovskite concentrate is high, the process flow is short, the cost is low, the operability is strong, and various models of ferrotitanium with the titanium content lower than 80 percent can be prepared.
Drawings
FIG. 1 is a schematic flow chart of a process for preparing a ferrotitanium alloy from a perovskite concentrate as a raw material in example 1 of the present invention;
FIG. 2 is a schematic flow chart of a process for preparing a ferrotitanium alloy from a perovskite concentrate as a raw material in example 2 of the present invention;
FIG. 3 is a schematic flow chart of a process for preparing a ferrotitanium alloy from a perovskite concentrate as a raw material in example 3 of the present invention;
FIG. 4 is a schematic flow chart of a method for preparing ferrotitanium alloy by using perovskite concentrate as a raw material in example 4 of the present invention.
Detailed Description
In the perovskite concentrate adopted in the embodiment of the invention, the main mineral composition is a perovskite phase (CaTiO)3) Pyroxene phase (m (CaO. MgO. 2 SiO)2)·(1-m)CaO·(Al,Ti)2O3·SiO2) Magnesium aluminate spinel phase (MgO. Al)2O3) And the like,also contains small amount of iron oxide, feldspar and low-valence titanium oxide.
The perovskite concentrate in the embodiment of the invention contains TiO according to the mass percentage230～60％，CaO 25～45％，Al2O32～10％，MgO 2～10％，SiO22～10％，Fe2O30.5-8% of other impurities<10％。
The aluminum powder and the fluorite adopted in the embodiment of the invention are commercial industrial products.
The molten iron adopted in the embodiment of the invention is industrial molten iron.
In the embodiment of the invention, a vacuum reduction device for smelting magnesium by an industrial Pidgeon process is adopted during reduction, or an induction furnace/intermediate frequency furnace is adopted.
The ferrotitanium cast ingot in the embodiment of the invention contains O less than or equal to 0.5 percent by mass.
The recovery rate of titanium in the embodiment of the invention is more than or equal to 90 percent.
In the embodiment of the invention, when the reducing powder is sprayed into the molten iron through the spray gun, the spraying amount is based on that the fluctuation of the molten iron liquid level is not caused, and the solidification of titanium and iron is prevented by external heating.
The ferrotitanium alloy cast ingot in the embodiment of the invention contains 50-80% of Ti by mass percent.
The vacuum stopping condition in the embodiment of the invention means that the vacuumizing is stopped and an air atmosphere condition is formed; in the examples of the present invention, the inert atmosphere condition is stopped by changing the inert atmosphere condition to an air atmosphere condition.
Example 1
The flow is shown in figure 1;
ball-milling the perovskite concentrate until the particle size is less than or equal to 0.075mm to prepare perovskite concentrate powder;
uniformly mixing perovskite concentrate powder with aluminum powder and scrap iron, and then pressing into pellets, wherein the pressing pressure is 100 MPa; wherein the particle size of the aluminum powder is less than or equal to 0.075mm and accounts for 16 percent of the total mass of the pellet; the particle size of the scrap iron is less than or equal to 1mm and accounts for 20 percent of the total mass of the pellet;
placing the pellets in a reduction furnace, heating the pellets to 1000 ℃ for reduction for 6 hours under a vacuum condition, wherein the vacuum degree is less than or equal to 100 Pa; the aluminum in the pellets reduces titanium oxide into metallic titanium, the metallic titanium and iron in the pellets form ferrotitanium alloy and are gathered into particles due to relatively low melting point, and the generated aluminum oxide reacts with calcium oxide to generate calcium aluminate; forming a reducing material in the reducing furnace after the reduction is finished; the reducing material is a block mass material; when calcium aluminate is generated, part of the calcium aluminate reacts with silicate to generate calcium aluminosilicate;
the perovskite concentrate contains magnesium aluminate spinel components, wherein magnesium oxide is reduced in the reduction process, and generated magnesium metal escapes; when titanium oxide reacts with aluminum to generate titanium suboxide, metal magnesium reacts with the titanium suboxide to generate magnesium oxide and metal titanium; in the repeated oxidation-reduction process of magnesium element, the reduction of titanium oxide is promoted, and finally the titanium oxide escapes in the form of simple substance magnesium and is crystallized outside the reduction furnace;
heating the reduced material to 1300-1550 ℃ under a vacuum condition to perform high-temperature melting separation, wherein the vacuum condition is that the vacuum degree is less than or equal to 100 Pa; stirring the reduced material during high-temperature melting, stopping vacuum condition after the reduced material is completely melted, and respectively forming ferrotitanium alloy melt and slag and layering the ferrotitanium element and the rest materials, wherein the ferrotitanium alloy melt is called as high-temperature melted ferrotitanium alloy melt; the high-temperature melting separation is directly carried out in a reduction furnace;
stopping stirring, pouring out the upper layer of molten slag, and cooling the molten slag to normal temperature to obtain calcium aluminate slag; adding molten iron into the ferrotitanium melt subjected to high-temperature melting, stirring and mixing uniformly under the condition that the temperature is kept to melt all materials, and then casting to prepare ferrotitanium cast ingots, wherein the adding amount of the molten iron is added according to the components of the ferrotitanium cast ingots.
Example 2
The flow is shown in fig. 2, and the method is different from the embodiment 1 in that:
(1) the pressure for pressing into pellets is 50 MPa; the aluminum powder accounts for 26 percent of the total mass of the pellet; scrap iron accounts for 5% of the total mass of the pellet;
(2) under the condition of inert atmosphere, heating the pellets to 1250 ℃ for reduction for 3 h; the inert atmosphere condition refers to an argon atmosphere condition, and the argon pressure is 0.1 MPa;
(3) adding a reducing material into molten iron with the temperature of more than or equal to 1400 ℃, wherein the mass ratio of the reducing material to the molten iron is 1:0.3, uniformly mixing all the materials by stirring, and forming a ferrotitanium melt and slag and layering the ferrotitanium melt and the rest materials respectively, wherein the ferrotitanium melt is called the ferrotitanium melt of the mixed molten iron;
(4) and casting the ferrotitanium melt mixed with molten iron to prepare ferrotitanium cast ingots.
Example 3
The flow is shown in fig. 3, and the method is different from the embodiment 1 in that:
(1) the pressure for pressing into pellets is 150 MPa; the aluminum powder accounts for 20 percent of the total mass of the pellet; the scrap iron accounts for 15 percent of the total mass of the pellet;
(2) heating the pellets to 800 ℃ under the inert atmosphere condition for reduction for 10 h; the inert atmosphere condition refers to an argon atmosphere condition, and the argon pressure is 0.2 MPa;
(3) cooling the reducing material along with the furnace to the temperature of less than or equal to 50 ℃, and then ball-milling the reducing material until the particle size is less than or equal to 0.075mm to prepare reducing powder; when the outlet of the spray gun is positioned at the bottom of molten iron, spraying reduced powder into the molten iron through the spray gun, wherein the temperature of the molten iron is more than or equal to 1500 ℃, the mass ratio of the reduced material to the molten iron is 1:0.4, ferrotitanium in the reduced powder is melted in the molten iron, all the materials are uniformly mixed by stirring, ferrotitanium and other materials respectively form ferrotitanium melt and slag and are layered, and the ferrotitanium melt is called as sprayed and mixed ferrotitanium melt;
(4) and blowing the mixed ferrotitanium melt to cast ferrotitanium alloy ingots.
Example 4
The flow is shown in fig. 4, and the method is different from the embodiment 1 in that:
(1) uniformly mixing perovskite concentrate powder, aluminum powder, scrap iron and fluorite, and then pressing into pellets; the particle size of fluorite is less than or equal to 0.075mm, and the fluorite contains CaF according to mass percentage2More than or equal to 90 percent; fluorite is 1 percent of the total mass of the perovskite concentrate powder, the aluminum powder and the scrap iron;
(2) the pressure for pressing into pellets is 40 MPa; the aluminum powder accounts for 22 percent of the total mass of the pellet; scrap iron accounts for 10% of the total mass of the pellet;
(3) under the condition of inert atmosphere, heating the pellets to 900 ℃ for reduction for 8 h; the inert atmosphere condition refers to an argon atmosphere condition, and the argon pressure is 0.05 MPa;
(4) heating the reduced material to 1300-1550 ℃ under the inert atmosphere condition for high-temperature melting separation, wherein the inert atmosphere condition is an argon atmosphere condition, and the argon pressure is 0.5 MPa; stopping the inert atmosphere condition after the reducing materials are completely melted; the high-temperature melting separation is carried out by firstly cooling the materials in the reduction furnace along with the furnace under the inert atmosphere condition until the temperature is less than or equal to 100 ℃, and then transferring the materials into other induction furnaces or intermediate frequency furnaces to prevent titanium and iron from being oxidized;
(5) adding waste iron into the ferrotitanium melt subjected to high-temperature melting, wherein the adding amount is added according to the components of the ferrotitanium cast ingot;
example 5
The method is the same as the embodiment 2, and is different from the following steps:
(1) uniformly mixing perovskite concentrate powder, aluminum powder, scrap iron and fluorite, and then pressing into pellets; the particle size of fluorite is less than or equal to 0.075mm, and the fluorite contains CaF according to mass percentage2More than or equal to 90 percent; fluorite is 2 percent of the total mass of the perovskite concentrate powder, the aluminum powder and the scrap iron; the aluminum powder accounts for 24 percent of the total mass of the pellet; the scrap iron accounts for 18 percent of the total mass of the pellet;
(2) the pressure for pressing into pellets is 200 MPa;
(3) heating the pellets to 1100 ℃ under the inert atmosphere condition for reduction for 5 h; the inert atmosphere condition refers to an argon atmosphere condition, and the argon pressure is 0.3 MPa;
(4) the mass ratio of the reducing material to the molten iron is 1: 0.6.
Example 6
The method is the same as the embodiment 3, and is different from the following steps:
(1) uniformly mixing perovskite concentrate powder, aluminum powder, scrap iron and fluorite, and then pressing into pellets; the particle size of fluorite is less than or equal to 0.075mm, and the fluorite contains CaF according to mass percentage2More than or equal to 90 percent; fluorite is 3 percent of the total mass of the perovskite concentrate powder, the aluminum powder and the scrap iron; the aluminum powder accounts for 18 percent of the total mass of the pellet; ironThe scraps account for 9 percent of the total mass of the pellets;
(2) the pressure for pressing into pellets is 180 MPa;
(3) heating the pellets to 1200 ℃ for reduction under the vacuum condition or inert atmosphere condition, wherein the reduction time is 4 h; the inert atmosphere condition refers to an argon atmosphere condition, and the argon pressure is 0.4 MPa;
(4) the mass ratio of the reducing material to the molten iron is 1: 0.2.
Claims (7)
1. A method for preparing ferrotitanium by taking perovskite concentrate as a raw material is characterized by comprising the following steps:
(1) ball-milling the perovskite concentrate until the particle size is less than or equal to 0.075mm to prepare perovskite concentrate powder;
(2) mixing the perovskite concentrate powder, aluminum powder and scrap iron uniformly, and then pressing into pellets; wherein the particle size of the aluminum powder is less than or equal to 0.075mm and accounts for 16-26% of the total mass of the pellet; the particle size of the scrap iron is less than or equal to 1mm and accounts for 5-20% of the total mass of the pellet;
(3) placing the pellets in a reduction furnace, heating the pellets to 800-1250 ℃ for reduction under the vacuum condition or inert atmosphere condition, wherein the reduction time is 3-10 h, titanium oxide is reduced into metallic titanium by aluminum in the pellets, the metallic titanium and iron in the pellets form ferrotitanium alloy and are gathered into particles due to relatively low melting point, and the generated aluminum oxide reacts with calcium oxide to generate calcium aluminate; forming a reducing material in the reducing furnace after the reduction is finished;
(4) heating the reduced material to 1300-1550 ℃ under a vacuum condition or an inert atmosphere condition for high-temperature melting separation, stirring the reduced material during high-temperature melting separation, stopping the vacuum condition or the inert atmosphere condition after the reduced material is completely melted, forming a ferrotitanium alloy melt and slag and layering the ferrotitanium element and other materials respectively, wherein the ferrotitanium alloy melt is called the high-temperature melting separated ferrotitanium alloy melt; or adding a reducing material into molten iron with the temperature of more than or equal to 1400 ℃, wherein the mass ratio of the reducing material to the molten iron is 1 (0.2-0.6), uniformly mixing all the materials by stirring, and forming a ferrotitanium alloy melt and slag and layering the ferrotitanium element and the rest materials respectively, wherein the ferrotitanium alloy melt is called the ferrotitanium melt of the mixed molten iron; or the reducing material is cooled to the temperature of less than or equal to 50 ℃ along with the furnace, and then ball-milled until the grain diameter is less than or equal to 0.075mm, so as to prepare reducing powder; when the outlet of the spray gun is positioned at the bottom of molten iron, spraying reduced powder into the molten iron through the spray gun, wherein the temperature of the molten iron is more than or equal to 1500 ℃, and the mass ratio of the reduced material to the molten iron is 1 (0.2-0.6), ferrotitanium in the reduced powder is melted in the molten iron, all the materials are uniformly mixed through stirring, the ferrotitanium and other materials respectively form ferrotitanium alloy melt and slag and are layered, and the ferrotitanium alloy melt is called sprayed and mixed ferrotitanium melt;
(5) stopping stirring, pouring out the upper layer of molten slag, and cooling the molten slag to normal temperature to obtain calcium aluminate slag; when the residual material is ferrotitanium melt which is melted at high temperature, adding molten iron or waste iron, stirring and mixing uniformly under the condition that the temperature is kept to melt all the materials, and then casting to prepare ferrotitanium cast ingots, wherein the adding amount of the molten iron or the waste iron is added according to the components of the ferrotitanium cast ingots; when the residual material is ferrotitanium melt of mixed molten iron or the mixed ferrotitanium melt is blown, casting to prepare ferrotitanium cast ingot.
2. The process of claim 1, wherein the perovskite concentrate contains TiO in percentage by mass230～60％。
3. The method for preparing the ferrotitanium alloy by using the perovskite concentrate as the raw material according to claim 1, wherein in the step (2), the pressure for pressing into the pellets is 40-200 MPa.
4. The process of claim 1, wherein the vacuum condition is a vacuum of 100Pa or less.
5. The method for preparing the ferrotitanium alloy by using the perovskite concentrate as the raw material according to claim 1, wherein the inert atmosphere condition is argon atmosphere condition, and the argon pressure is 0.05-0.5 MPa.
6. The method for preparing ferrotitanium alloy from perovskite concentrate as a raw material according to claim 1, wherein in the step (2), perovskite concentrate powder, aluminum powder, scrap iron and fluorite are uniformly mixed and then pressed into pellets; the fluorite has a particle size of less than or equal to 0.075mm and contains CaF according to mass percent2More than or equal to 90 percent; fluorite is 1-3% of the total mass of the perovskite concentrate powder, the aluminum powder and the scrap iron.
7. The process for preparing ferrotitanium alloy from perovskite concentrate as a raw material according to claim 1, wherein in the step (4), the high-temperature melting is carried out directly in the reduction furnace of the step (3) or transferred to other induction furnace or intermediate frequency furnace; when the materials are transferred into other induction furnaces or intermediate frequency furnaces, the materials in the reduction furnace are firstly cooled to the temperature of less than or equal to 100 ℃ along with the furnace under the vacuum condition or inert atmosphere condition, and then transferred into other induction furnaces or intermediate frequency furnaces to prevent titanium and iron from being oxidized.
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| CN115652116A (en) * | 2022-11-07 | 2023-01-31 | 江苏江南铁合金有限公司 | Method for preparing high-titanium-iron alloy outside electric heating auxiliary furnace |
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