WO2018228156A1 - 一种高钒高铬型钒钛磁铁矿球团 - Google Patents

一种高钒高铬型钒钛磁铁矿球团 Download PDF

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Publication number
WO2018228156A1
WO2018228156A1 PCT/CN2018/088043 CN2018088043W WO2018228156A1 WO 2018228156 A1 WO2018228156 A1 WO 2018228156A1 CN 2018088043 W CN2018088043 W CN 2018088043W WO 2018228156 A1 WO2018228156 A1 WO 2018228156A1
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Prior art keywords
vanadium
titanium magnetite
pellet
chromium type
chromium
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PCT/CN2018/088043
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English (en)
French (fr)
Inventor
薛向新
张勇
程功金
张志祥
姜涛
张显峰
杨合
姚本金
杨松陶
周晟程
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东北大学
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Publication of WO2018228156A1 publication Critical patent/WO2018228156A1/zh

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/2406—Binding; Briquetting ; Granulating pelletizing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/008—Composition or distribution of the charge
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/02—Roasting processes

Definitions

  • the invention belongs to the field of blast furnace smelting technology in the comprehensive utilization method of high vanadium and high chromium type vanadium-titanium magnetite, and particularly relates to a high vanadium and high chromium type vanadium-titanium magnetite pellet.
  • iron and steel enterprises urgently need to expand the source of iron ore resources and develop high value-added vanadium and chromium products. Importing foreign iron ore resources has become a trend, importing high vanadium and high chromium vanadium and titanium magnets. Iron ore is a multi-metal co-contributing ore rich in iron, vanadium, titanium, chromium and other valuable components, and its application value is extremely high.
  • the imported high vanadium and high chromium type vanadium-titanium magnetite has problems of coarse particle size, poor sphericity, and large consumption of bentonite when preparing high vanadium and high chromium type vanadium-titanium magnetite pellets, and is not suitable for existing ones.
  • the particle size is coarse and the specific surface area is small, which is not conducive to the oxidation of the pellets.
  • the connection force between the ore particles is small during the roasting process, and the pellet strength is low.
  • the pellet size, green ball drop strength and green ball compressive strength prepared by the prior art can not meet the production process requirements, and ultimately affect the pellet production and quality. This will affect the improvement of smelting smelting indicators and the improvement of ironmaking technology.
  • the problem to be solved by the present invention is that the high vanadium and high chromium type vanadium-titanium magnetite pellets prepared by the prior art have coarse particle size, poor sphericity, and bentonite consumption when preparing high vanadium and high chromium type vanadium-titanium magnetite pellets.
  • the disadvantage of large quantity the high vanadium and high chromium type vanadium-titanium magnetite pellet provided by the invention adopts imported high vanadium and high chromium type vanadium-titanium magnetite as raw materials, and the ratio of bentonite is reduced in the raw material ratio. More than 1%, the grade of pellets has been greatly improved; the quality of raw balls has been effectively improved, and the yield and quality of pellets have been guaranteed.
  • the high vanadium high chromium type vanadium titanium magnetite pellet of the invention comprises 61.88 ⁇ 64.22 wt.% of TFe, and the chemical composition and mass percentage thereof are: Fe 2 O 3 : 87.51 - 91.41%, FeO: 0.3 to 0.8%, V 2 O 5 : 0.45 to 0.62%, TiO 2 : 2.29 to 3.20%, Cr 2 O 3 : 0.22 to 0.48%, CaO: 0.11 to 0.63%, and SiO 2 : 3.18 to 4.77%. MgO: 0.32 to 0.89%, Al 2 O 3 : 1.62 to 4.0%, and the balance is an unavoidable impurity;
  • the high vanadium and high chromium type vanadium-titanium magnetite pellets are prepared by grinding high-vanadium and high-chromium vanadium-titanium magnetite powder, iron material and bentonite, wherein the weight ratio of each component is:
  • the milled high vanadium high chromium type vanadium titanium magnetite powder is a high vanadium high chromium type with a fineness of -200 mesh ⁇ 90% obtained by grinding high vanadium and high chromium type vanadium titanium magnetite.
  • vanadium and titanium magnetite powder, comprising the TFe is 61 ⁇ 63wt%, and the mass percentage of chemical components comprising of:.
  • FeO 26 ⁇ 28% , Fe 3 O 4: 54.06 ⁇ 58.97%, V 2 O 5: 0.9 to 1.1%, TiO 2 : 4.5 to 5.5%, Cr 2 O 3 : 0.45 to 0.85%, CaO: 0.16 to 0.26%, SiO 2 : 2 to 3%, MgO: 0.5 to 1.0%, Al 2 O 3 : 2.5 to 4.0%, the balance is an inevitable impurity;
  • the iron material contains components and parts by weight thereof: ordinary iron ore powder: 70 to 100 parts; ordinary ultrafine iron powder: 0 to 30 parts;
  • the ordinary iron ore fine powder has a particle size of ⁇ 0.5 mm, and the maximum particle diameter is ⁇ 3 mm;
  • Ordinary ultrafine iron powder has a fineness of -325 mesh ⁇ 85% or -200 mesh ⁇ 95%;
  • the bentonite has a particle size of ⁇ 200 mesh, and the components thereof and the mass percentage thereof are: SiO 2 : 66 to 69%, Al 2 O 3 : 13 to 16%, MgO: 4 to 5%, and CaO: 2 to 3 %, Na 2 O ⁇ 1.7%, K 2 O ⁇ 1.2%, and the balance is an unavoidable impurity.
  • the prepared high vanadium and high chromium type vanadium-titanium magnetite pellets have a green sphere size of 8 to 16 mm, a green ball falling strength of ⁇ 4 times/piece, a compressive strength of ⁇ 10 N/piece, and a high pre-oxidized high vanadium.
  • the compressive strength of chromium-type vanadium-titanium magnetite pellets is ⁇ 300N/piece, and the compressive strength of high-vanadium and high-chromium vanadium-titanium magnetite pellets after calcination is ⁇ 2200N/piece, and the reduction expansion ratio of pellets ⁇ 16.4%.
  • the preparation method of the above high vanadium and high chromium type vanadium titanium magnetite pellets is achieved by the following steps: grinding, compounding, drying and mixing, adding bottom water mixing, dip material, pelletizing, green ball screening, baking Intervene oxidation, shaft furnace roasting, cooling, the specific steps are:
  • the high vanadium and high chromium type vanadium-titanium magnetite is ground and the grinding time is 5 to 15 minutes, and the high vanadium and high chromium type vanadium-titanium magnetite powder after grinding is obtained, and the fineness is -200 mesh ⁇ 90 %;
  • the grinding machine adopts a grinding machine, wherein the process parameters of the grinding machine are: the working rotation number of the cylinder is 14.3 to 21.95 r/min, and the ratio of the ball of the grinding machine is: (3.4 to 11.3): (24) ⁇ 83);
  • the raw materials are weighed and uniformly mixed to obtain a mixed material
  • Step 4 add bottom water mix, dip
  • the dried mixture material is added to water, and uniformly mixed, and then dip for 30 to 50 minutes to obtain a mashed material; wherein the amount of water added is 1.8 to 2.2% of the mass of the mixture after drying;
  • the enamel material is placed in a disc pelletizer, water is added, so that the water content of the high vanadium high chromium type vanadium titanium magnetite ball is controlled to be 9-11%, the ball is formed, and the particle size is obtained by sieving. 8 to 16 mm high vanadium and high chromium vanadium-titanium magnetite ore ball;
  • the high vanadium and high chromium type vanadium-titanium magnetite ore ball with a particle size of 8 to 16 mm is evenly distributed into the drying bed at the top of the shaft furnace through a cloth machine, and is preheated and dehydrated by drying and dehydrating in the drying bed. , obtaining a pre-oxidized high vanadium high chromium type vanadium titanium magnetite pellet, wherein the drying bed temperature is controlled to be 650 to 750 ° C, the hood temperature is controlled to 160 to 210 ° C, and the layer thickness is controlled to be 100 to 140mm, drying time is 5-9min;
  • the pre-oxidized high-vanadium high-chromium-type vanadium-titanium magnetite pellet is dried in a shaft furnace to obtain a high-vanadium high-chromium-type vanadium-titanium magnetite pellet after calcination;
  • the roasting process is: a combustion chamber The temperature is 1150 ⁇ 1250°C, the combustion chamber pressure is 7 ⁇ 11kPa, the gas pressure is 18 ⁇ 20kPa, the combustion air pressure is 16 ⁇ 18kPa, and the baking time is 10 ⁇ 18min;
  • the calcined high vanadium and high chromium vanadium-titanium magnetite pellets are discharged from the bottom of the shaft furnace after being cooled by the furnace to obtain high vanadium and high chromium vanadium-titanium magnetite pellets.
  • the specific drying method is as follows: the mixture is placed in a dry box and dried at 90-110 ° C until the moisture content of the mixture is 6-8%.
  • the method of adding water adopts atomization and water addition.
  • the dip material refers to covering the water-mixed mixture with a plastic bag or plastic paper for the purpose of uniformly mixing the water.
  • the screening is specifically a roll screen, which is specifically for screening the high vanadium high chromium type vanadium titanium magnetite ball obtained by the disc ball making mechanism through the gap between the sieve rolls.
  • the high vanadium high chromium type vanadium titanium magnetite ball with a particle size of 8-16 mm enters the next step, and the high vanadium high chromium type vanadium titanium magnetite ball with a particle size of less than 8 mm is returned to the disc pelletizer of step 5.
  • the high vanadium high chromium vanadium-titanium magnetite ore ball with a particle size larger than 16mm is broken into ore powder and returned to the disc pelletizer of step 5 for pelletizing.
  • the high vanadium high chromium type vanadium titanium magnetite pellets have a production capacity of 1,500 tons/day.
  • the high vanadium and high chromium type vanadium-titanium magnetite pellet is used for smelting the imported high vanadium and high chromium vanadium-titanium magnetite.
  • a high vanadium and high chromium type vanadium-titanium magnetite pellet of the invention is appropriately adjusted by grinding and importing high vanadium and high chromium type vanadium titanium magnetite, mixing common iron ore powder and ordinary ultrafine iron powder.
  • the ratio of bentonite is a good solution to the disadvantages of excessive consumption of bentonite when the high-vanadium and high-chromium vanadium-titanium magnetite is too coarse, the sphericity is poor, and the high vanadium and high-chromium vanadium-titanium magnetite pellets are prepared.
  • Run grinding makes the average size of the mixture increase by more than 8%, the ratio of bentonite is reduced by more than 1%, and the grade of pellets is improved to a large extent; the quality of the green ball is effectively improved, and the yield and quality of the pellets are guaranteed;
  • the vanadium-containing V 2 O 5 0.45-0.62%, TiO 2 : 2.29-3.20%, Cr 2 O 3 : 0.22-0.48% can be achieved when the pellet component is stable.
  • the vanadium-containing V 2 O 5 0.45-0.62%, TiO 2 : 2.29-3.20%, Cr 2 O 3 : 0.22-0.48% can be achieved when the pellet component is stable.
  • the mineral powder particles in the pellet are more closely bonded, and the microstructure is more uniform and compact, thereby making the performance of the high vanadium and high chromium vanadium titanomagnetite pellet.
  • Metallurgical properties such as properties are superior.
  • the high vanadium high chromium vanadium titanate magnetite used in the following examples is from the Ural region of Russia.
  • High-chromium high vanadium vanadium-titanium magnetite embodiment used in the following embodiments, which contains TFe is 61 ⁇ 63wt%, and the mass percentage of chemical components comprising of:. FeO: 26 ⁇ 28% , Fe 3 O 4: 54.06 ⁇ 58.97%, V 2 O 5 : 0.9 to 1.1%, TiO 2 : 4.5 to 5.5%, Cr 2 O 3 : 0.45 to 0.85%, CaO: 0.16 to 0.26%, SiO 2 : 2 to 3%, MgO: 0.5 ⁇ 1.0%, Al 2 O 3 : 2.5 to 4.0%, the balance being unavoidable impurities;
  • Common iron ores used in the following embodiment Examples, comprising TFe is 63 ⁇ 65wt%, and the mass percentage of chemical components comprising of:. FeO: 22 ⁇ 28% , Fe 3 O 4: 56.82 ⁇ 66.03%, CaO: 0.06 ⁇ 1.0%, SiO 2 : 5 to 6%, MgO: 0.14 to 0.74%, and Al 2 O 3 : 1 to 4%, and the balance is an unavoidable impurity.
  • the ordinary ultrafine iron powder used in the following examples contains a TFe of 65 to 69 wt.%, and contains chemical components and mass percentages thereof: FeO: 23 to 27%, Fe 3 O 4 : 60.66 to 70.48%, CaO. : 0.1 to 0.2%, SiO 2 : 4 to 8%, MgO: 0.15 to 0.35%, and Al 2 O 3 : 0.05 to 0.35%, and the balance is an unavoidable impurity.
  • the bentonite used in the following examples is a commercially available product, and the components thereof and the mass percentage thereof are: SiO 2 : 66 to 69%, Al 2 O 3 : 13 to 16%, MgO: 4 to 5%, CaO: 2 to 3%, Na 2 O ⁇ 1.7%, K 2 O ⁇ 1.2%, and the balance is an unavoidable impurity.
  • a high vanadium high chromium type vanadium titanium magnetite pellet comprising 64.22 wt.% of TFe, containing chemical components and mass percentage thereof: Fe 2 O 3 : 91.41%, FeO: 0.3%, V 2 O 5 : 0.45%, TiO 2 : 2.29%, Cr 2 O 3 : 0.22%, CaO: 0.11%, SiO 2 : 3.18%, MgO: 0.32%, Al 2 O 3 : 1.62%, the balance is unavoidable Impurity
  • the high vanadium and high chromium type vanadium-titanium magnetite pellets are prepared by grinding high vanadium and high chromium vanadium-titanium magnetite powder, iron material and bentonite, wherein the weight ratio of each component is:
  • the milled high vanadium high chromium type vanadium titanium magnetite powder is a high vanadium high chromium type with a fineness of -200 mesh ⁇ 90% obtained by grinding high vanadium and high chromium type vanadium titanium magnetite. Vanadium-titanium magnetite powder;
  • the iron material contains components and parts by weight thereof: ordinary iron ore fines: 70 parts; ordinary ultrafine iron powder: 30 parts;
  • the ordinary iron ore fine powder has a particle size of ⁇ 0.5 mm, and the maximum particle diameter is ⁇ 3 mm;
  • Ordinary ultrafine iron powder has a fineness of -325 mesh ⁇ 85% or -200 mesh ⁇ 95%;
  • the bentonite has a particle size of ⁇ 200 mesh
  • the preparation method of the high vanadium high chromium type vanadium titanium magnetite pellet of the present embodiment is realized by the following steps: grinding, compounding, drying and mixing, adding bottom water mixing, dip material, pelletizing, raw ball screening , drying pre-oxidation, shaft furnace roasting, cooling, the specific steps are:
  • the high vanadium and high chromium type vanadium-titanium magnetite is ground and the grinding time is 15 min, and the high-vanadium high-chromium vanadium-titanium magnetite powder after grinding is obtained, and the fineness is -200 mesh ⁇ 90%;
  • the grinding machine adopts a grinding machine, wherein the process parameters of the grinding machine are: the size of the grinding machine is MR3254, the outer dimension is 13.4m ⁇ 7.25m ⁇ 5.7m, the inner diameter of the cylinder is 3.2m, and the cylinder works. The length is 5.4m, the effective capacity of the cylinder is 39.5m3, the working revolution of the cylinder is 16.5r/min, and the maximum loading of the grinding machine is 6t of material and 44t of steel ball;
  • the raw materials are weighed and uniformly mixed to obtain a mixed material
  • the mixture is placed in a dry box and dried at 90 ° C until the moisture content of the mixture is 8%, and the dried mixture is obtained;
  • Step 4 add bottom water mix, dip
  • the dried mixture material is added to water by atomization and water addition, and uniformly mixed, and then the mixture material added with water is covered with a plastic bag, and the mixture is poured for 30 minutes to obtain a good material; wherein the amount of water added is dried. 2% of the mass of the subsequent mixture;
  • the simmered material is placed in a disc pelletizer, and water is added to control the water content of the high vanadium high chromium type vanadium titanium magnetite ball to be controlled at 11%, and the granules are sieved to obtain a particle size of 8 ⁇ . 10mm high vanadium high chromium vanadium titanium magnetite ball;
  • the sieving is specifically a roll screen, which is specifically for sieving the high vanadium high chromium type vanadium titanium magnetite ball obtained by the disc blasting mechanism through the gap between the sieve rolls, and the particle size is 8-10 mm.
  • the high vanadium and high chromium type vanadium-titanium magnetite ore ball enters the next step, and the high vanadium high chromium type vanadium titanium magnetite ore ball with a particle size of less than 8 mm is returned to the disc pelletizer of step 5 to continue the ball formation, and the particle size is greater than 10 mm.
  • the high vanadium high chromium type vanadium titanium magnetite ore ball is broken into ore powder and returned to the disc pelletizer of step 5 for pelletizing.
  • the prepared high vanadium and high chromium type vanadium-titanium magnetite pellets have a green ball size of 8 to 10 mm, a green ball drop strength of 6 times/piece, and a compressive strength of 15 N/piece.
  • the high vanadium and high chromium type vanadium-titanium magnetite ore ball with a particle size of 8-10 mm is evenly distributed into the drying bed at the top of the shaft furnace through a cloth machine, and is preheated and dehydrated by drying and dehydrating in the drying bed. , obtaining a pre-oxidized high vanadium high chromium type vanadium titanium magnetite pellet, wherein the drying bed temperature is controlled to 750 ° C, the hood temperature is controlled to 210 ° C, the layer thickness is controlled to 140 mm, and the drying time is 9min;
  • the compressive strength of the pre-oxidized high vanadium high chromium type vanadium titanium magnetite pellets is 400 N/piece.
  • the pre-oxidized high-vanadium high-chromium-type vanadium-titanium magnetite pellet is dried in a shaft furnace to obtain a high-vanadium high-chromium-type vanadium-titanium magnetite pellet after calcination;
  • the roasting process is: a combustion chamber The temperature is 1250 ° C, the combustion chamber pressure is 7 kPa, the gas pressure is 20 kPa, the combustion air pressure is 18 kPa, and the baking time is 10 min;
  • the calcined high vanadium and high chromium vanadium-titanium magnetite pellets are discharged from the bottom of the shaft furnace after being cooled by the furnace to obtain high vanadium and high chromium vanadium-titanium magnetite pellets.
  • the calcined high vanadium and high chromium vanadium-titanium magnetite pellets have a compressive strength of 2,500 N/piece and a reduction expansion ratio of 11.9%.
  • a high vanadium high chromium type vanadium titanomagnetite pellet comprising a TFe of 62.42 wt.%, comprising a chemical composition and a mass percentage thereof: Fe 2 O 3 : 88.84%, FeO: 0.30%, V 2 O 5 : 0.47%, TiO 2 : 3.10%, Cr 2 O 3 : 0.35%, CaO: 0.11%, SiO 2 : 4.77%, MgO: 0.32%, Al 2 O 3 : 1.62%, the balance is unavoidable Impurities.
  • the high vanadium and high chromium type vanadium-titanium magnetite pellets are prepared by grinding high-vanadium and high-chromium vanadium-titanium magnetite powder, iron material and bentonite, wherein the weight ratio of each component is:
  • High-vanadium and high-chromium vanadium-titanium magnetite powder after grinding 54 parts, iron material: 46 parts, bentonite: 1.0 part;
  • the milled high vanadium high chromium type vanadium titanium magnetite powder is a high vanadium high chromium type with a fineness of -200 mesh ⁇ 90% obtained by grinding high vanadium and high chromium type vanadium titanium magnetite. Vanadium-titanium magnetite powder;
  • the iron material contains components and parts by weight thereof: ordinary iron ore fines: 100 parts; wherein, ordinary iron ore fines have a particle size of ⁇ 0.5 mm, 90%, and the maximum particle diameter is ⁇ 3 mm;
  • the bentonite has a particle size of ⁇ 200 mesh
  • the preparation method of the high vanadium high chromium type vanadium titanium magnetite pellet of the present embodiment is realized by the following steps: grinding, compounding, drying and mixing, adding bottom water mixing, dip material, pelletizing, raw ball screening , drying pre-oxidation, shaft furnace roasting, cooling, the specific steps are:
  • the high vanadium and high chromium type vanadium-titanium magnetite is ground and the grinding time is 8 min, and the high-vanadium high-chromium vanadium-titanium magnetite powder after grinding is obtained, and the fineness is -200 mesh ⁇ 90%;
  • the grinding machine adopts a grinding machine, wherein the process parameters of the grinding machine are: MR3870, the outer dimension is 16.4m ⁇ 8.74m ⁇ 7.59m, the inner diameter of the cylinder is 3.8m, and the cylinder works.
  • the length is 7.0m
  • the effective capacity of the cylinder is 73.6m 3
  • the working revolution of the cylinder is 14.3r/min
  • the maximum loading of the grinding machine is 11.3t of material and 83t of steel ball;
  • the raw materials are weighed and uniformly mixed to obtain a mixed material
  • the mixture was placed in a dry box and dried at 110 ° C until the moisture content of the mixture was 6%, and the dried mixture was obtained;
  • Step 4 add bottom water mix, dip
  • the dried mixture material is added to water by atomization and water addition, and uniformly mixed, and then the mixture material added with water is covered with a plastic bag, and the mixture is poured for 30 minutes to obtain a good material; wherein the amount of water added is dried. 2% of the mass of the subsequent mixture;
  • the simmered material is placed in a disc pelletizer, and water is added to control the moisture content of the high vanadium high chromium type vanadium titanium magnetite ball to be controlled at 9%, and the spheroid is obtained by sieving to obtain a particle size of 9 ⁇ . 15mm high vanadium and high chromium vanadium-titanium magnetite ore ball;
  • the screening is specifically a roller screen, which is specifically for screening a high vanadium high chromium type vanadium titanium magnetite ball obtained by a disc spherizing mechanism through a gap between the sieve rolls, and the particle size is 9-15 mm.
  • the high vanadium and high chromium type vanadium-titanium magnetite ore ball enters the next step, and the high vanadium high chromium type vanadium titanium magnetite ball with a particle size of less than 9 mm is returned to the disc pelletizer of step 5 to continue the ball formation, and the particle size is greater than 15 mm.
  • the high vanadium high chromium type vanadium titanium magnetite ore ball is broken into ore powder and returned to the disc pelletizer of step 5 for pelletizing.
  • the prepared high vanadium and high chromium type vanadium-titanium magnetite pellets have a green particle size of 9 to 15 mm, a green ball drop strength of 4 times/piece, and a compressive strength of 11.6 N/piece.
  • the high vanadium and high chromium type vanadium-titanium magnetite ball with a particle size of 9-15 mm is evenly distributed into the drying bed at the top of the shaft furnace through a cloth machine, and is preheated and oxidized by drying and dehydrating in the drying bed. , obtaining a pre-oxidized high vanadium high chromium type vanadium titanium magnetite pellet, wherein the drying bed temperature is controlled to 650 ° C, the hood temperature is controlled to 160 ° C, the layer thickness is controlled to 100 mm, and the drying time is 5min;
  • the compressive strength of the pre-oxidized high vanadium high chromium type vanadium titanium magnetite pellets was 330 N/piece.
  • the pre-oxidized high-vanadium high-chromium-type vanadium-titanium magnetite pellet is dried in a shaft furnace to obtain a high-vanadium high-chromium-type vanadium-titanium magnetite pellet after calcination;
  • the roasting process is: a combustion chamber The temperature is 1150 ° C, the combustion chamber pressure is 7 kPa, the gas pressure is 18 kPa, the combustion air pressure is 16 kPa, and the baking time is 18 min;
  • the calcined high vanadium and high chromium vanadium-titanium magnetite pellets are discharged from the bottom of the shaft furnace after being cooled by the furnace to obtain high vanadium and high chromium vanadium-titanium magnetite pellets.
  • the calcined high vanadium and high chromium vanadium-titanium magnetite pellets have a compressive strength of 2260 N/piece and a reduction expansion ratio of 13.8%.
  • the embodiment adopts the disc cutting machine to cut the material, ensure the accuracy of each disc cutting, adhere to the running plate system, ensure that the iron material is tested once every 15 minutes, the fluctuation range is within ⁇ 0.5kg/m; bentonite per 25 The minute run is detected once, each time it is run five times, and the average value is fluctuated within ⁇ 0.02kg/m.
  • the high vanadium and high chromium type vanadium-titanium magnetite pellets are prepared by grinding high-vanadium and high-chromium vanadium-titanium magnetite powder, iron material and bentonite, wherein the weight ratio of each component is:
  • the milled high vanadium high chromium type vanadium titanium magnetite powder is a high vanadium high chromium type with a fineness of -200 mesh ⁇ 90% obtained by grinding high vanadium and high chromium type vanadium titanium magnetite. Vanadium-titanium magnetite powder;
  • the iron material contains components and parts by weight: ordinary iron ore fines: 70 parts, ordinary ultrafine iron powder: 30 parts; wherein, ordinary iron ore fines have a particle size of ⁇ 0.5 mm, accounting for 90%, and The maximum particle size is ⁇ 3mm; the fineness of ordinary ultrafine iron powder is -200 mesh ⁇ 95%;
  • the bentonite has a particle size of ⁇ 200 mesh
  • the preparation method of the high vanadium high chromium type vanadium titanium magnetite pellet of the present embodiment is realized by the following steps: grinding, compounding, drying and mixing, adding bottom water mixing, dip material, pelletizing, raw ball screening , drying pre-oxidation, shaft furnace roasting, cooling, the specific steps are:
  • the high vanadium and high chromium type vanadium-titanium magnetite is ground and the grinding time is 10 min, and the high-vanadium high-chromium vanadium-titanium magnetite powder after grinding is obtained, and the fineness is -200 mesh ⁇ 90%;
  • the grinding machine adopts a grinding machine, wherein the process parameters of the grinding machine are: the size of the grinding machine is MR2265, the outer dimension is 10.97m ⁇ 5.62m ⁇ 4.05m, the inner diameter of the cylinder is 2.2m, and the cylinder works.
  • the length is 6.5m, the effective capacity of the cylinder is 21.4m3, the working revolution of the cylinder is 21.95r/min, and the maximum load of the grinding machine is 3.4t of material and 24t of steel ball;
  • the raw materials are weighed and uniformly mixed to obtain a mixed material
  • the mixture is placed in a dry box and dried at 110 ° C until the water content of the mixture is 7%, and the dried mixture is obtained;
  • Step 4 add bottom water mix, dip
  • the dried mixture is added to the water by atomization and water addition, and evenly mixed, and then the mixture of water added is covered with a plastic bag, and the mixture is kneaded for 40 minutes to obtain a mashed material; wherein the amount of water added is dried. 2.2% of the mass of the subsequent mixture;
  • the simmered material is placed in a disc pelletizer, and water is added to control the water content of the high vanadium high chromium type vanadium titanium magnetite ball to be controlled at 10%, and the ball is sifted to obtain a particle size of 9 ⁇ . 16mm high vanadium high chromium vanadium titanium magnetite ball;
  • the screening is specifically a roll screen, which is specifically for screening a high vanadium high chromium type vanadium titanium magnetite ball obtained by a disc ball making mechanism through a gap between the sieve rolls, and the particle size is 9-16 mm.
  • the high vanadium and high chromium type vanadium-titanium magnetite ore ball enters the next step, and the high vanadium high chromium type vanadium-titanium magnetite ore ball with a particle size of less than 9 mm is returned to the disc pelletizer of step 5 to continue the ball formation, and the particle size is larger than 16 mm.
  • the high vanadium high chromium type vanadium titanium magnetite ore ball is broken into ore powder and returned to the disc pelletizer of step 5 for pelletizing.
  • the prepared high vanadium and high chromium type vanadium-titanium magnetite pellets have a green particle size of 9 to 16 mm, a green ball drop strength of 5 times/piece, and a compressive strength of 12 N/piece.
  • the particle size of 9 ⁇ 16mm is evenly distributed into the drying bed at the top of the shaft furnace through the cloth machine, and pre-heated and oxidized by drying and dehydration in the drying bed to obtain the dried pre-oxidized high-vanadium high-chromium vanadium.
  • Titanium magnetite pellets wherein the temperature of the drying bed is controlled to 750 ° C, the temperature of the hood is controlled to 210 ° C, the thickness of the layer is controlled to be 140 mm, and the drying time is 9 min;
  • the compressive strength of the pre-oxidized high vanadium high chromium type vanadium titanium magnetite pellets is 360 N/piece.
  • the pre-oxidized high-vanadium high-chromium-type vanadium-titanium magnetite pellet is dried in a shaft furnace to obtain a high-vanadium high-chromium-type vanadium-titanium magnetite pellet after calcination;
  • the roasting process is: a combustion chamber The temperature is 1250 ° C, the combustion chamber pressure is 11 kPa, the gas pressure is 20 kPa, the combustion air pressure is 18 kPa, and the baking time is 10 min;
  • the calcined high vanadium and high chromium vanadium-titanium magnetite pellets are discharged from the bottom of the shaft furnace after being cooled by the furnace to obtain high vanadium and high chromium vanadium-titanium magnetite pellets.
  • the calcined high vanadium and high chromium vanadium-titanium magnetite pellets have a compressive strength of 2410 N/piece and a reduction expansion ratio of 12.8%.
  • a high vanadium and high chromium type vanadium-titanium magnetite pellet comprising 61.88 wt.% of TFe, containing chemical components and mass percentage thereof: Fe 2 O 3 : 87.51%, FeO: 0.8%, V 2 O 5 : 0.62%, TiO 2 : 3.20%, Cr 2 O 3 : 0.48%, CaO: 0.63%, SiO 2 : 3.25%, MgO: 0.34%, Al 2 O 3 : 3.06%, the balance is unavoidable Impurities.
  • the high vanadium and high chromium type vanadium-titanium magnetite pellets are prepared by grinding high-vanadium and high-chromium vanadium-titanium magnetite powder, iron material and bentonite, wherein the weight ratio of each component is:
  • the milled high vanadium high chromium type vanadium titanium magnetite powder is a high vanadium high chromium type with a fineness of -200 mesh ⁇ 90% obtained by grinding high vanadium and high chromium type vanadium titanium magnetite. Vanadium-titanium magnetite powder;
  • the iron material contains components and parts by weight: ordinary iron ore fines: 85 parts, ordinary ultrafine iron powder: 15 parts; wherein, ordinary iron ore fines have a particle size of ⁇ 0.5 mm, accounting for 90%, and The maximum particle size is ⁇ 3mm; the fineness of ordinary ultrafine iron powder is -200 mesh ⁇ 95%;
  • the bentonite has a particle size of ⁇ 200 mesh
  • the preparation method of the high vanadium high chromium type vanadium titanium magnetite pellet of the present embodiment is realized by the following steps: grinding, compounding, drying and mixing, adding bottom water mixing, dip material, pelletizing, raw ball screening , drying pre-oxidation, shaft furnace roasting, cooling, the specific steps are:
  • the high vanadium and high chromium type vanadium-titanium magnetite is ground and the grinding time is 5 min, and the high-vanadium high-chromium vanadium-titanium magnetite powder after grinding is obtained, and the fineness is -200 mesh ⁇ 90%;
  • the grinding machine adopts a grinding machine, wherein the process parameters of the grinding machine are: the size of the grinding machine is MR3254, the outer dimension is 13.4m ⁇ 7.25m ⁇ 5.7m, the inner diameter of the cylinder is 3.2m, and the cylinder works. The length is 5.4m, the effective capacity of the cylinder is 39.5m 3 , the working revolution of the cylinder is 16.5r/min, and the maximum loading of the grinding machine is 6t of material and 44t of steel ball;
  • the raw materials are weighed and uniformly mixed to obtain a mixed material
  • the mixture is placed in a dry box and dried at 110 ° C until the moisture content of the mixture is 8%, and the dried mixture is obtained;
  • Step 4 add bottom water mix, dip
  • the dried mixture is added to the water by atomization and water addition, and evenly mixed, and then the mixture of water added is covered with a plastic bag, and the mixture is kneaded for 50 minutes to obtain a good material; wherein the amount of water added is dried. 1.8% of the mass of the subsequent mixture;
  • the simmered material is placed in a disc pelletizer, and water is added to control the water content of the high vanadium high chromium type vanadium titanium magnetite ball to be controlled at 11%, and the granules are sieved to obtain a particle size of 8 ⁇ . 15mm high vanadium and high chromium vanadium-titanium magnetite ore ball;
  • the sieving is specifically a roll screen, which is specifically for sieving the high vanadium high chromium type vanadium titanium magnetite ball obtained by the disc spherizing mechanism through the gap between the sieve rolls, and the particle size is 8-15 mm.
  • the high vanadium and high chromium type vanadium-titanium magnetite ore ball enters the next step, and the high vanadium high chromium type vanadium titanium magnetite ore ball with a particle size of less than 8 mm is returned to the disc pelletizer of step 5 to continue the ball formation, and the particle size is greater than 15 mm.
  • the high vanadium high chromium type vanadium titanium magnetite ore ball is broken into ore powder and returned to the disc pelletizer of step 5 for pelletizing.
  • the prepared high vanadium and high chromium type vanadium-titanium magnetite pellets have a green ball size of 8 to 15 mm, a green ball drop strength of 4 times/piece, and a compressive strength of 10 N/piece.
  • the grain size of 8 ⁇ 15mm is evenly distributed into the drying bed at the top of the shaft furnace through the cloth machine, and pre-heated and oxidized by drying and dehydration in the drying bed to obtain the high-vanadium high-chromium vanadium which is pre-oxidized by drying.
  • Titanium magnetite pellets wherein the temperature of the drying bed is controlled to 700 ° C, the temperature of the hood is controlled to 190 ° C, the thickness of the layer is controlled to be 120 mm, and the drying time is 7 min;
  • the compressive strength of the pre-oxidized high vanadium high chromium type vanadium titanomagnetite pellets is 300 N/piece.
  • the pre-oxidized high-vanadium high-chromium-type vanadium-titanium magnetite pellet is dried in a shaft furnace to obtain a high-vanadium high-chromium-type vanadium-titanium magnetite pellet after calcination;
  • the roasting process is: a combustion chamber The temperature is 1200 ° C, the combustion chamber pressure is 9 kPa, the gas pressure is 19 kPa, the combustion air pressure is 17 kPa, and the baking time is 14 min;
  • the calcined high vanadium and high chromium vanadium-titanium magnetite pellets are discharged from the bottom of the shaft furnace after being cooled by the furnace to obtain high vanadium and high chromium vanadium-titanium magnetite pellets.
  • the calcined high vanadium and high chromium type vanadium-titanium magnetite pellets have a compressive strength of 2200 N/piece and a reduction expansion ratio of 16.4%.
  • a high vanadium high chromium type vanadium titanium magnetite pellet comprising a TFe of 63.28 wt.%, comprising a chemical composition and a mass percentage thereof: Fe 2 O 3 : 89.79%, FeO: 0.47%, V 2 O 5 : 0.48%, TiO 2 : 2.86%, Cr 2 O 3 : 0.27%, CaO: 0.22%, SiO 2 : 3.26%, MgO: 0.53%, Al 2 O 3 : 1.92%, the balance is unavoidable Impurities.
  • the high vanadium and high chromium vanadium-titanium magnetite pellets are prepared from untreated high vanadium and high chromium vanadium-titanium magnetite powder, iron material and bentonite, wherein the weight ratio of each component is:
  • Untreated high-vanadium high-chromium vanadium-titanium magnetite powder 53 parts, iron material: 47 parts, bentonite: 1.0 part;
  • the iron material contains components and parts by weight: ordinary iron ore fines: 70 parts, ordinary ultrafine iron powder: 30 parts; wherein, ordinary iron ore fines have a particle size of ⁇ 0.5 mm, accounting for 90%, and The maximum particle size is ⁇ 3mm; the fineness of ordinary ultrafine iron powder is -200 mesh ⁇ 95%;
  • the bentonite has a particle size of ⁇ 200 mesh
  • the preparation method of the high vanadium high chromium type vanadium titanium magnetite pellet of the present embodiment is realized by the following steps: batching, drying and mixing, adding bottom water mixing, dip material, pelletizing, green ball screening, drying Pre-oxidation, shaft furnace roasting, cooling, the specific steps are:
  • the raw materials are weighed and uniformly mixed to obtain a mixed material
  • the mixture is placed in a dry box and dried at 110 ° C until the water content of the mixture is 7%, and the dried mixture is obtained;
  • Step 3 add bottom water mix, dip
  • the dried mixture is added to the water by atomization and water addition, and evenly mixed, and then the mixture of water added is covered with a plastic bag, and the mixture is kneaded for 40 minutes to obtain a mashed material; wherein the amount of water added is dried. 2.2% of the mass of the subsequent mixture;
  • Step 4 pelletizing and sieving
  • the simmered material is placed in a disc pelletizer, and water is added to control the water content of the high vanadium high chromium type vanadium titanium magnetite ball to be controlled at 10%, and the ball is sifted to obtain a particle size of 9 ⁇ . 16mm high vanadium high chromium vanadium titanium magnetite ball;
  • the screening is specifically a roll screen, which is specifically for screening a high vanadium high chromium type vanadium titanium magnetite ball obtained by a disc ball making mechanism through a gap between the sieve rolls, and the particle size is 9-16 mm.
  • the high vanadium and high chromium type vanadium-titanium magnetite ore ball enters the next step, and the high vanadium high chromium type vanadium-titanium magnetite ore ball with a particle size of less than 9 mm is returned to the disc pelletizer of step 5 to continue the ball formation, and the particle size is larger than 16 mm.
  • the high vanadium high chromium type vanadium titanium magnetite ore ball is broken into ore powder and returned to the disc pelletizer of step 5 for pelletizing.
  • the prepared high vanadium and high chromium type vanadium-titanium magnetite pellets have a green ball size of 6 to 12 mm, a green ball drop strength of 2 times/piece, and a compressive strength of 7 N/piece.
  • the particle size of 9 ⁇ 16mm is evenly distributed into the drying bed at the top of the shaft furnace through the cloth machine, and pre-heated and oxidized by drying and dehydration in the drying bed to obtain the dried pre-oxidized high-vanadium high-chromium vanadium.
  • Titanium magnetite pellets wherein the temperature of the drying bed is controlled to 750 ° C, the temperature of the hood is controlled to 210 ° C, the thickness of the layer is controlled to be 140 mm, and the drying time is 9 min;
  • the pre-oxidized high vanadium high chromium type vanadium titanium magnetite pellets have a compressive strength of 200 N/piece.
  • Step 6 shaft furnace roasting
  • the pre-oxidized high-vanadium high-chromium-type vanadium-titanium magnetite pellet is dried in a shaft furnace to obtain a high-vanadium high-chromium-type vanadium-titanium magnetite pellet after calcination;
  • the roasting process is: a combustion chamber The temperature is 1250 ° C, the combustion chamber pressure is 11 kPa, the gas pressure is 20 kPa, the combustion air pressure is 18 kPa, and the baking time is 10 min;
  • the calcined high vanadium and high chromium vanadium-titanium magnetite pellets are discharged from the bottom of the shaft furnace after being cooled by the furnace to obtain high vanadium and high chromium vanadium-titanium magnetite pellets.
  • the calcined high vanadium and high chromium vanadium-titanium magnetite pellets have a compressive strength of 1520 N/piece and a reduction expansion ratio of 25%.

Abstract

一种高钒高铬型钒钛磁铁矿球团，属于高钒高铬型钒钛磁铁矿综合利用方法中的高炉冶炼技术领域。该高钒高铬型钒钛磁铁矿球团，包含的化学成分及其质量百分比为：V 2O 5：0.45～0.62％，TiO 2：2.29～3.20％，Cr 2O 3：0.22～0.48％，TFe：61.88～64.22％，CaO：0.11～0.63％，SiO 2：3.18～4.77％，MgO：0.32～0.89％，Al 2O 3：1.62～4.0％，余量为不可避免的杂质；其中，TFe中，Fe 2O 3占球团质量百分比为87.51～91.41％，FeO占球团质量百分比为0.3～0.8％。制备球团采用的原料配比，膨润土配比降低1％以上，球团矿品位得到提高；切实有效地提高了生球质量，保证了球团矿产量和质量。

Description

一种高钒高铬型钒钛磁铁矿球团 技术领域
本发明属于高钒高铬型钒钛磁铁矿综合利用方法中的高炉冶炼技术领域，特别涉及一种高钒高铬型钒钛磁铁矿球团。
背景技术
随着国产铁矿石供求缺口日益变大，钢铁企业急需拓展铁矿资源的来源和开发高附加值钒铬产品，进口国外铁矿资源成为了一种趋势，进口高钒高铬型钒钛磁铁矿是一种富含铁、钒、钛、铬等多种有价组元的多金属共伴生矿，应用价值极高。现有技术中，进口高钒高铬型钒钛磁铁矿存在粒度粗，成球性差，制备高钒高铬型钒钛磁铁矿球团时膨润土消耗量大等问题，不适于现有的针对国内铁矿粉的造球工艺，并且，粒度的粗细直接影响球团的质量，进口高钒高铬型钒钛磁铁矿粉铁矿粉粒度较粗，造球过程中，成球性差，粒度粗，比表面积小，不利于球团氧化，焙烧过程中矿颗粒间连接力小，球团强度低。采用现有工艺制备的球团生球粒度、生球落下强度和生球抗压强度达不到生产工艺要求，最终影响球团矿产量和质量。从而影响高炉冶炼指标改进及炼铁技术的提高。
发明内容
本发明要解决的问题是，采用现有技术制备的高钒高铬型钒钛磁铁矿球团存在粒度粗、成球性差、制备高钒高铬型钒钛磁铁矿球团时膨润土消耗量大的缺点，本发明提供的一种高钒高铬型钒钛磁铁矿球团采用进口的高钒高铬型钒钛磁铁矿为原料，并且在原料配比中，膨润土配比降低1％以上，球团矿品位得到较大程度的提高；切实有效地提高了生球质量，保证了球团矿产量和质量。
本发明的一种高钒高铬型钒钛磁铁矿球团，其包含的TFe为61.88～64.22wt.％，包含的化学成分及其质量百分比为：Fe 2O 3：87.51～91.41％，FeO：0.3～0.8％，V 2O 5：0.45～0.62％，TiO 2：2.29～3.20％，Cr 2O 3：0.22～0.48％，CaO：0.11～0.63％，SiO 2：3.18～4.77％，MgO：0.32～0.89％，Al 2O 3：1.62～4.0％，余量为不可避免的杂质；
高钒高铬型钒钛磁铁矿球团由润磨后的高钒高铬型钒钛磁铁矿粉、铁料和膨润土制备而成，其中，各个成分的重量份数比为：
润磨后的高钒高铬型钒钛磁铁矿粉：51～56份，铁料：44～49份，膨润土：0.8～1.1份；
所述的润磨后的高钒高铬型钒钛磁铁矿粉是进口高钒高铬型钒钛磁铁矿进行润磨得到的细度为-200目≥90％的高钒高铬型钒钛磁铁矿粉，其包含的TFe为61～63wt.％，包含的化学成 分及其质量百分比为：FeO：26～28％，Fe 3O 4：54.06～58.97％，V 2O 5：0.9～1.1％，TiO 2：4.5～5.5％，Cr 2O 3：0.45～0.85％，CaO：0.16～0.26％，SiO 2：2～3％，MgO：0.5～1.0％，Al 2O 3：2.5～4.0％，余量为不可避免的杂质；
所述的铁料含有的成分及其重量份数为：普通铁矿粉：70～100份；普通超细铁粉：0～30份；
其中，普通铁矿粉的粒径≤0.5mm的占90％，且其最大粒径≤3mm；
普通超细铁粉的细度为-325目≥85％或-200目≥95％；
所述的膨润土的粒度≤200目，其含有的成分及其质量百分比为：SiO 2：66～69％，Al 2O 3：13～16％，MgO：4～5％，CaO：2～3％，Na 2O≤1.7％，K 2O≤1.2％，余量为不可避免的杂质。
制备的高钒高铬型钒钛磁铁矿球团的生球粒度为8～16mm，生球落下强度为≥4次/个，抗压强度≥10N/个，烘干预氧化的高钒高铬型钒钛磁铁矿球团的抗压强度为≥300N/个，焙烧后的高钒高铬型钒钛磁铁矿球团的抗压强度为≥2200N/个，球团的还原膨胀率≤16.4％。
上述的高钒高铬型钒钛磁铁矿球团的制备方法，通过以下步骤实现：润磨、配料、烘干混合、加底水混料、焖料、造球、生球筛分、烘干预氧化、竖炉焙烧、冷却，具体步骤为：
步骤1，润磨
将高钒高铬型钒钛磁铁矿进行润磨，润磨时间为5～15min，制得润磨后的高钒高铬型钒钛磁铁矿粉，其细度为-200目≥90％；
所述的润磨采用润磨机，其中，润磨机的工艺参数为：筒体工作转数为14.3～21.95r/min，润磨机的料球比为：(3.4～11.3)：(24～83)；
步骤2，配料
按照高钒高铬型钒钛磁铁矿球团的原料组成及其重量份数比，称量原料，混合均匀，得到混合物料；
步骤3，烘干
将混合物料烘干至混合物料含水率为6～8％，得到烘干后的混合物料；
步骤4，加底水混料、焖料
将烘干后的混合物料加入水，并混合均匀，然后焖料30～50min，得到焖好的料；其中，加入水的量为烘干后的混合物料质量的1.8～2.2％；
步骤5，造球及筛分
将焖好的料置于圆盘造球机中，加入水，使得高钒高铬型钒钛磁铁矿生球含水率控制在9～11％，进行造球，通过筛分，得到粒度为8～16mm的高钒高铬型钒钛磁铁矿生球；
步骤6，烘干预氧化
将粒度为8～16mm的高钒高铬型钒钛磁铁矿生球，通过布料机均匀的布入竖炉炉顶处的烘干床内，在烘干床内经过烘干脱水预热氧化，得到烘干预氧化的高钒高铬型钒钛磁铁矿球团，其中，烘干床温度控制为650～750℃、烟罩温度控制为160～210℃、料层厚度控制为100～140mm、烘干时间为5～9min；
步骤7，竖炉焙烧
将烘干预氧化的高钒高铬型钒钛磁铁矿球团置于竖炉中进行焙烧，得到焙烧后的高钒高铬型钒钛磁铁矿球团；其焙烧工艺为：燃烧室温度为1150～1250℃、燃烧室压力为7～11kPa、煤气压力为18～20kPa、助燃风压力为16～18kPa，焙烧时间为10～18min；
步骤8，冷却
将焙烧后的高钒高铬型钒钛磁铁矿球团，随炉冷却后，从竖炉炉底排出，得到高钒高铬型钒钛磁铁矿球团。
所述的步骤3中，所述的烘干具体操作方法为：将混合物料置于干燥箱中，在90～110℃进行烘干，直至混合物料含水率为6～8％。
所述的步骤4中，所述的加入水的方式采用雾化加水。
所述的步骤4中，所述的焖料是指用塑料袋或塑料纸覆盖加入水的混合物料，目的在于，使水分混合均匀。
所述的步骤5中，所述的筛分具体为辊筛，其具体为将圆盘造球机制得的高钒高铬型钒钛磁铁矿生球通过筛辊之间的间隙进行筛分，粒度为8～16mm的高钒高铬型钒钛磁铁矿生球进入下一步骤，粒度小于8mm的高钒高铬型钒钛磁铁矿生球返回至步骤5的圆盘造球机继续造球，粒度大于16mm的高钒高铬型钒钛磁铁矿生球经过破碎成矿粉，返回至步骤5的圆盘造球机造球。
所述的高钒高铬型钒钛磁铁矿球团的产量达到1500吨/天。
所述的高钒高铬型钒钛磁铁矿球团用于高炉冶炼进口高钒高铬型钒钛磁铁矿的炉料。
本发明的一种高钒高铬型钒钛磁铁矿球团，相比于现有技术，其有益效果是：
1.本发明的一种高钒高铬型钒钛磁铁矿球团，通过润磨进口高钒高铬型钒钛磁铁矿、混合普通铁矿粉和普通超细铁粉，适当的调整膨润土配比，很好的解决了进口高钒高铬型钒钛磁铁矿粒度过粗，成球性差、制备高钒高铬型钒钛磁铁矿球团时膨润土消耗量大的劣势；通过润磨使得混合料粒级平均提高8％以上，膨润土配比降低1％以上，球团矿品位得到较大程度的提高；切实有效地提高了生球质量，保证了球团矿产量、质量；
2.通过设定合理的焙烧温度，实现了球团矿成分稳定的情况下达到含钒V 2O 5：0.45～0.62％，TiO 2：2.29～3.20％，Cr 2O 3：0.22～0.48％，满足了高炉冶炼进口高钒高铬型钒钛 磁铁矿的要求。
3.本发明中制备高钒高铬型钒钛磁铁矿球团过程中，加底水和焖料的好处是有利于球团的制备和均匀，进而提高球团的产量和质量，而且为后续的竖炉焙烧带来很大的方便，再者有利于制备性能更为优异的球团。
4.本发明中通过润磨和原料配比等的改变，球团中矿粉颗粒结合状态更为紧密，微观结构更为均匀致密，从而使得高钒高铬型钒钛磁铁矿球团性能得到很大程度的提高，包括更高的生球落下强度，更高的生球抗压强度，更高的氧化球团抗压强度，且氧化球团的还原膨胀、还原性及软熔滴落特性等冶金性能更为优异。
具体实施方式
下面结合实施例对本发明作进一步的详细说明。
以下实施例所用的高钒高铬型钒钛磁铁矿来自俄罗斯乌拉尔地区。
以下实施例所用的高钒高铬型钒钛磁铁矿，其包含的TFe为61～63wt.％，包含的化学成分及其质量百分比为：FeO：26～28％，Fe 3O 4：54.06～58.97％，V 2O 5：0.9～1.1％，TiO 2：4.5～5.5％，Cr 2O 3：0.45～0.85％，CaO：0.16～0.26％，SiO 2：2～3％，MgO：0.5～1.0％，Al 2O 3：2.5～4.0％，余量为不可避免的杂质；
以下实施例所用的普通铁矿粉，其包含TFe为63～65wt.％，包含的化学成分及其质量百分比为：FeO：22～28％，Fe 3O 4：56.82～66.03％，CaO：0.06～1.0％，SiO 2：5～6％，MgO：0.14～0.74％，Al 2O 3：1～4％，余量为不可避免的杂质。
以下实施例所用的普通超细铁粉，其包含的TFe为65～69wt.％，包含的化学成分及其质量百分比为：FeO：23～27％，Fe 3O 4：60.66～70.48％，CaO：0.1～0.2％，SiO 2：4～8％，MgO：0.15～0.35％，Al 2O 3：0.05～0.35％，余量为不可避免的杂质。
以下实施例所用的膨润土为市购产品，其含有的成分及其质量百分比为：SiO 2：66～69％，Al 2O 3：13～16％，MgO：4～5％，CaO：2～3％，Na 2O≤1.7％，K 2O≤1.2％，余量为不可避免的杂质。
本发明技术方案不局限于以下所列举具体实施方式，还包括各具体实施方式间的任意组合。
实施例1
一种高钒高铬型钒钛磁铁矿球团，其包含的TFe为64.22wt.％，包含的化学成分及其质量百分比为：Fe 2O 3：91.41％，FeO：0.3％，V 2O 5：0.45％，TiO 2：2.29％，Cr 2O 3：0.22％，CaO：0.11％，SiO 2：3.18％，MgO：0.32％，Al 2O 3：1.62％，余量为不可避免的杂质；
高钒高铬型钒钛磁铁矿球团由润磨后的高钒高铬型钒钛磁铁矿粉、铁料和膨润土制备而 成，其中，各个成分的重量份数比为：
润磨后的高钒高铬型钒钛磁铁矿粉：51份，铁料：49份，膨润土：0.8份；
所述的润磨后的高钒高铬型钒钛磁铁矿粉是进口高钒高铬型钒钛磁铁矿进行润磨得到的细度为-200目≥90％的高钒高铬型钒钛磁铁矿粉；
所述的铁料含有的成分及其重量份数为：普通铁矿粉：70份；普通超细铁粉：30份；
其中，普通铁矿粉的粒径≤0.5mm的占90％，且其最大粒径≤3mm；
普通超细铁粉的细度为-325目≥85％或-200目≥95％；
所述的膨润土的粒度≤200目；
本实施例的高钒高铬型钒钛磁铁矿球团的制备方法，通过以下步骤实现：润磨、配料、烘干混合、加底水混料、焖料、造球、生球筛分、烘干预氧化、竖炉焙烧、冷却，具体步骤为：
步骤1，润磨
将高钒高铬型钒钛磁铁矿进行润磨，润磨时间为15min，制得润磨后的高钒高铬型钒钛磁铁矿粉，其细度为-200目≥90％；
所述的润磨采用润磨机，其中，润磨机的工艺参数为：润磨机的规格为MR3254，外形尺寸为13.4m×7.25m×5.7m，筒体内径为3.2m，筒体工作长度5.4m，筒体有效容量39.5m3，筒体工作转数为16.5r/min，润磨机的最大装载量为物料6t、钢球44t；
步骤2，配料
按照高钒高铬型钒钛磁铁矿球团的原料组成及其重量份数比，称量原料，混合均匀，得到混合物料；
步骤3，烘干
将混合物料置于干燥箱中，在90℃进行烘干，直至混合物料含水率为8％，得到烘干后的混合物料；
步骤4，加底水混料、焖料
将烘干后的混合物料采用雾化加水的方式加入水，并混合均匀，然后用塑料袋覆盖加入水的混合物料，焖料30min，得到焖好的料；其中，加入水的量为烘干后的混合物料质量的2％；
步骤5，造球及筛分
将焖好的料置于圆盘造球机中，加入水，使得高钒高铬型钒钛磁铁矿生球含水率控制在11％，进行造球，通过筛分，得到粒度为8～10mm的高钒高铬型钒钛磁铁矿生球；
所述的筛分具体为辊筛，其具体为将圆盘造球机制得的高钒高铬型钒钛磁铁矿生球通过 筛辊之间的间隙进行筛分，粒度为8～10mm的高钒高铬型钒钛磁铁矿生球进入下一步骤，粒度小于8mm的高钒高铬型钒钛磁铁矿生球返回至步骤5的圆盘造球机继续造球，粒度大于10mm的高钒高铬型钒钛磁铁矿生球经过破碎成矿粉，返回至步骤5的圆盘造球机造球。
制备的高钒高铬型钒钛磁铁矿球团的生球粒度为8～10mm，生球落下强度为6次/个，抗压强度15N/个。
步骤6，烘干预氧化
将粒度为8～10mm的高钒高铬型钒钛磁铁矿生球，通过布料机均匀的布入竖炉炉顶处的烘干床内，在烘干床内经过烘干脱水预热氧化，得到烘干预氧化的高钒高铬型钒钛磁铁矿球团，其中，烘干床温度控制为750℃、烟罩温度控制为210℃、料层厚度控制为140mm、烘干时间为9min；
烘干预氧化的高钒高铬型钒钛磁铁矿球团的抗压强度为400N/个。
步骤7，竖炉焙烧
将烘干预氧化的高钒高铬型钒钛磁铁矿球团置于竖炉中进行焙烧，得到焙烧后的高钒高铬型钒钛磁铁矿球团；其焙烧工艺为：燃烧室温度为1250℃、燃烧室压力为7kPa、煤气压力为20kPa、助燃风压力为18kPa，焙烧时间为10min；
步骤8，冷却
将焙烧后的高钒高铬型钒钛磁铁矿球团，随炉冷却后，从竖炉炉底排出，得到高钒高铬型钒钛磁铁矿球团。
焙烧后的高钒高铬型钒钛磁铁矿球团的抗压强度为2500N/个，还原膨胀率为11.9％。
实施例2
一种高钒高铬型钒钛磁铁矿球团，其包含的TFe为62.42wt.％，包含的化学成分及其质量百分比为：Fe 2O 3：88.84％，FeO：0.30％，V 2O 5：0.47％，TiO 2：3.10％，Cr 2O 3：0.35％，CaO：0.11％，SiO 2：4.77％，MgO：0.32％，Al 2O 3：1.62％，余量为不可避免的杂质。
高钒高铬型钒钛磁铁矿球团由润磨后的高钒高铬型钒钛磁铁矿粉、铁料和膨润土制备而成，其中，各个成分的重量份数比为：
润磨后的高钒高铬型钒钛磁铁矿粉：54份，铁料：46份，膨润土：1.0份；
所述的润磨后的高钒高铬型钒钛磁铁矿粉是进口高钒高铬型钒钛磁铁矿进行润磨得到的细度为-200目≥90％的高钒高铬型钒钛磁铁矿粉；
所述的铁料含有的成分及其重量份数为：普通铁矿粉：100份；其中，普通铁矿粉的粒径≤0.5mm的占90％，且其最大粒径≤3mm；
所述的膨润土的粒度≤200目；
本实施例的高钒高铬型钒钛磁铁矿球团的制备方法，通过以下步骤实现：润磨、配料、烘干混合、加底水混料、焖料、造球、生球筛分、烘干预氧化、竖炉焙烧、冷却，具体步骤为：
步骤1，润磨
将高钒高铬型钒钛磁铁矿进行润磨，润磨时间为8min，制得润磨后的高钒高铬型钒钛磁铁矿粉，其细度为-200目≥90％；
所述的润磨采用润磨机，其中，润磨机的工艺参数为：润磨机的规格为MR3870，外形尺寸为16.4m×8.74m×7.59m，筒体内径为3.8m，筒体工作长度7.0m，筒体有效容量73.6m 3，筒体工作转数为14.3r/min，润磨机的最大装载量为物料11.3t、钢球83t；
步骤2，配料
按照高钒高铬型钒钛磁铁矿球团的原料组成及其重量份数比，称量原料，混合均匀，得到混合物料；
步骤3，烘干
将混合物料置于干燥箱中，在110℃进行烘干，直至混合物料含水率为6％，得到烘干后的混合物料；
步骤4，加底水混料、焖料
将烘干后的混合物料采用雾化加水的方式加入水，并混合均匀，然后用塑料袋覆盖加入水的混合物料，焖料30min，得到焖好的料；其中，加入水的量为烘干后的混合物料质量的2％；
步骤5，造球及筛分
将焖好的料置于圆盘造球机中，加入水，使得高钒高铬型钒钛磁铁矿生球含水率控制在9％，进行造球，通过筛分，得到粒度为9～15mm的高钒高铬型钒钛磁铁矿生球；
所述的筛分具体为辊筛，其具体为将圆盘造球机制得的高钒高铬型钒钛磁铁矿生球通过筛辊之间的间隙进行筛分，粒度为9～15mm的高钒高铬型钒钛磁铁矿生球进入下一步骤，粒度小于9mm的高钒高铬型钒钛磁铁矿生球返回至步骤5的圆盘造球机继续造球，粒度大于15mm的高钒高铬型钒钛磁铁矿生球经过破碎成矿粉，返回至步骤5的圆盘造球机造球。
制备的高钒高铬型钒钛磁铁矿球团的生球粒度为9～15mm，生球落下强度为4次/个，抗压强度11.6N/个。
步骤6，烘干预氧化
将粒度为9～15mm的高钒高铬型钒钛磁铁矿生球，通过布料机均匀的布入竖炉炉顶处的烘干床内，在烘干床内经过烘干脱水预热氧化，得到烘干预氧化的高钒高铬型钒钛磁铁矿球 团，其中，烘干床温度控制为650℃、烟罩温度控制为160℃、料层厚度控制为100mm、烘干时间为5min；
烘干预氧化的高钒高铬型钒钛磁铁矿球团的抗压强度为330N/个。
步骤7，竖炉焙烧
将烘干预氧化的高钒高铬型钒钛磁铁矿球团置于竖炉中进行焙烧，得到焙烧后的高钒高铬型钒钛磁铁矿球团；其焙烧工艺为：燃烧室温度为1150℃、燃烧室压力为7kPa、煤气压力为18kPa、助燃风压力为16kPa，焙烧时间为18min；
步骤8，冷却
将焙烧后的高钒高铬型钒钛磁铁矿球团，随炉冷却后，从竖炉炉底排出，得到高钒高铬型钒钛磁铁矿球团。
焙烧后的高钒高铬型钒钛磁铁矿球团的抗压强度为2260N/个，还原膨胀率为13.8％。
本实施方式使用圆盘下料机下料，保证各圆盘下料准确性，坚持跑盘制度，保证铁料每15分钟跑盘检测一次，波动范围在±0.5kg/m以内；膨润土每25分钟跑盘检测一次，每次跑盘五次，取平均值，波动范围在±0.02kg/m以内。
实施例3
一种高钒高铬型钒钛磁铁矿球团，其包含的TFe为63.18wt.％，包含的化学成分及其质量百分比为：Fe 2O 3：89.79％，FeO：0.47％，V 2O 5：0.48％，TiO 2：2.56％，Cr 2O 3：0.29％，CaO：0.22％，SiO 2：3.32％，MgO：0.89％，Al 2O 3：1.96％，余量为不可避免的杂质。
高钒高铬型钒钛磁铁矿球团由润磨后的高钒高铬型钒钛磁铁矿粉、铁料和膨润土制备而成，其中，各个成分的重量份数比为：
润磨后的高钒高铬型钒钛磁铁矿粉：52份，铁料：48份，膨润土：0.9份；
所述的润磨后的高钒高铬型钒钛磁铁矿粉是进口高钒高铬型钒钛磁铁矿进行润磨得到的细度为-200目≥90％的高钒高铬型钒钛磁铁矿粉；
所述的铁料含有的成分及其重量份数为：普通铁矿粉：70份，普通超细铁粉：30份；其中，普通铁矿粉的粒径≤0.5mm的占90％，且其最大粒径≤3mm；普通超细铁粉的细度为-200目≥95％；
所述的膨润土的粒度≤200目；
本实施例的高钒高铬型钒钛磁铁矿球团的制备方法，通过以下步骤实现：润磨、配料、烘干混合、加底水混料、焖料、造球、生球筛分、烘干预氧化、竖炉焙烧、冷却，具体步骤为：
步骤1，润磨
将高钒高铬型钒钛磁铁矿进行润磨，润磨时间为10min，制得润磨后的高钒高铬型钒钛磁铁矿粉，其细度为-200目≥90％；
所述的润磨采用润磨机，其中，润磨机的工艺参数为：润磨机的规格为MR2265，外形尺寸为10.97m×5.62m×4.05m，筒体内径为2.2m，筒体工作长度6.5m，筒体有效容量21.4m3，筒体工作转数为21.95r/min，润磨机的最大装载量为物料3.4t、钢球24t；
步骤2，配料
按照高钒高铬型钒钛磁铁矿球团的原料组成及其重量份数比，称量原料，混合均匀，得到混合物料；
步骤3，烘干
将混合物料置于干燥箱中，在110℃进行烘干，直至混合物料含水率为7％，得到烘干后的混合物料；
步骤4，加底水混料、焖料
将烘干后的混合物料采用雾化加水的方式加入水，并混合均匀，然后用塑料袋覆盖加入水的混合物料，焖料40min，得到焖好的料；其中，加入水的量为烘干后的混合物料质量的2.2％；
步骤5，造球及筛分
将焖好的料置于圆盘造球机中，加入水，使得高钒高铬型钒钛磁铁矿生球含水率控制在10％，进行造球，通过筛分，得到粒度为9～16mm的高钒高铬型钒钛磁铁矿生球；
所述的筛分具体为辊筛，其具体为将圆盘造球机制得的高钒高铬型钒钛磁铁矿生球通过筛辊之间的间隙进行筛分，粒度为9～16mm的高钒高铬型钒钛磁铁矿生球进入下一步骤，粒度小于9mm的高钒高铬型钒钛磁铁矿生球返回至步骤5的圆盘造球机继续造球，粒度大于16mm的高钒高铬型钒钛磁铁矿生球经过破碎成矿粉，返回至步骤5的圆盘造球机造球。
制备的高钒高铬型钒钛磁铁矿球团的生球粒度为9～16mm，生球落下强度为5次/个，抗压强度12N/个。
步骤6，烘干预氧化
将粒度为9～16mm的通过布料机均匀的布入竖炉炉顶处的烘干床内，在烘干床内经过烘干脱水预热氧化，得到烘干预氧化的高钒高铬型钒钛磁铁矿球团，其中，烘干床温度控制为750℃、烟罩温度控制为210℃、料层厚度控制为140mm、烘干时间为9min；
烘干预氧化的高钒高铬型钒钛磁铁矿球团的抗压强度为360N/个。
步骤7，竖炉焙烧
将烘干预氧化的高钒高铬型钒钛磁铁矿球团置于竖炉中进行焙烧，得到焙烧后的高钒高 铬型钒钛磁铁矿球团；其焙烧工艺为：燃烧室温度为1250℃、燃烧室压力为11kPa、煤气压力为20kPa、助燃风压力为18kPa，焙烧时间为10min；
步骤8，冷却
将焙烧后的高钒高铬型钒钛磁铁矿球团，随炉冷却后，从竖炉炉底排出，得到高钒高铬型钒钛磁铁矿球团。
焙烧后的高钒高铬型钒钛磁铁矿球团的抗压强度为2410N/个，还原膨胀率为12.8％。
实施例4
一种高钒高铬型钒钛磁铁矿球团，其包含的TFe为61.88wt.％，包含的化学成分及其质量百分比为：Fe 2O 3：87.51％，FeO：0.8％，V 2O 5：0.62％，TiO 2：3.20％，Cr 2O 3：0.48％，CaO：0.63％，SiO 2：3.25％，MgO：0.34％，Al 2O 3：3.06％，余量为不可避免的杂质。
高钒高铬型钒钛磁铁矿球团由润磨后的高钒高铬型钒钛磁铁矿粉、铁料和膨润土制备而成，其中，各个成分的重量份数比为：
润磨后的高钒高铬型钒钛磁铁矿粉：56份，铁料：44份，膨润土：1.1份；
所述的润磨后的高钒高铬型钒钛磁铁矿粉是进口高钒高铬型钒钛磁铁矿进行润磨得到的细度为-200目≥90％的高钒高铬型钒钛磁铁矿粉；
所述的铁料含有的成分及其重量份数为：普通铁矿粉：85份，普通超细铁粉：15份；其中，普通铁矿粉的粒径≤0.5mm的占90％，且其最大粒径≤3mm；普通超细铁粉的细度为-200目≥95％；
所述的膨润土的粒度≤200目；
本实施例的高钒高铬型钒钛磁铁矿球团的制备方法，通过以下步骤实现：润磨、配料、烘干混合、加底水混料、焖料、造球、生球筛分、烘干预氧化、竖炉焙烧、冷却，具体步骤为：
步骤1，润磨
将高钒高铬型钒钛磁铁矿进行润磨，润磨时间为5min，制得润磨后的高钒高铬型钒钛磁铁矿粉，其细度为-200目≥90％；
所述的润磨采用润磨机，其中，润磨机的工艺参数为：润磨机的规格为MR3254，外形尺寸为13.4m×7.25m×5.7m，筒体内径为3.2m，筒体工作长度5.4m，筒体有效容量39.5m 3，筒体工作转数为16.5r/min，润磨机的最大装载量为物料6t、钢球44t；
步骤2，配料
按照高钒高铬型钒钛磁铁矿球团的原料组成及其重量份数比，称量原料，混合均匀，得到混合物料；
步骤3，烘干
将混合物料置于干燥箱中，在110℃进行烘干，直至混合物料含水率为8％，得到烘干后的混合物料；
步骤4，加底水混料、焖料
将烘干后的混合物料采用雾化加水的方式加入水，并混合均匀，然后用塑料袋覆盖加入水的混合物料，焖料50min，得到焖好的料；其中，加入水的量为烘干后的混合物料质量的1.8％；
步骤5，造球及筛分
将焖好的料置于圆盘造球机中，加入水，使得高钒高铬型钒钛磁铁矿生球含水率控制在11％，进行造球，通过筛分，得到粒度为8～15mm的高钒高铬型钒钛磁铁矿生球；
所述的筛分具体为辊筛，其具体为将圆盘造球机制得的高钒高铬型钒钛磁铁矿生球通过筛辊之间的间隙进行筛分，粒度为8～15mm的高钒高铬型钒钛磁铁矿生球进入下一步骤，粒度小于8mm的高钒高铬型钒钛磁铁矿生球返回至步骤5的圆盘造球机继续造球，粒度大于15mm的高钒高铬型钒钛磁铁矿生球经过破碎成矿粉，返回至步骤5的圆盘造球机造球。
制备的高钒高铬型钒钛磁铁矿球团的生球粒度为8～15mm，生球落下强度为4次/个，抗压强度10N/个。
步骤6，烘干预氧化
将粒度为8～15mm的通过布料机均匀的布入竖炉炉顶处的烘干床内，在烘干床内经过烘干脱水预热氧化，得到烘干预氧化的高钒高铬型钒钛磁铁矿球团，其中，烘干床温度控制为700℃、烟罩温度控制为190℃、料层厚度控制为120mm、烘干时间为7min；
烘干预氧化的高钒高铬型钒钛磁铁矿球团的抗压强度为300N/个。
步骤7，竖炉焙烧
将烘干预氧化的高钒高铬型钒钛磁铁矿球团置于竖炉中进行焙烧，得到焙烧后的高钒高铬型钒钛磁铁矿球团；其焙烧工艺为：燃烧室温度为1200℃、燃烧室压力为9kPa、煤气压力为19kPa、助燃风压力为17kPa，焙烧时间为14min；
步骤8，冷却
将焙烧后的高钒高铬型钒钛磁铁矿球团，随炉冷却后，从竖炉炉底排出，得到高钒高铬型钒钛磁铁矿球团。
焙烧后的高钒高铬型钒钛磁铁矿球团的抗压强度为2200N/个，还原膨胀率为16.4％。
对比例
一种高钒高铬型钒钛磁铁矿球团，其包含的TFe为63.28wt.％，包含的化学成分及其质 量百分比为：Fe 2O 3：89.79％，FeO：0.47％，V 2O 5：0.48％，TiO 2：2.86％，Cr 2O 3：0.27％，CaO：0.22％，SiO 2：3.26％，MgO：0.53％，Al 2O 3：1.92％，余量为不可避免的杂质。
高钒高铬型钒钛磁铁矿球团由未经过处理的高钒高铬型钒钛磁铁矿粉、铁料和膨润土制备而成，其中，各个成分的重量份数比为：
未经过处理的高钒高铬型钒钛磁铁矿粉：53份，铁料：47份，膨润土：1.0份；
所述的铁料含有的成分及其重量份数为：普通铁矿粉：70份，普通超细铁粉：30份；其中，普通铁矿粉的粒径≤0.5mm的占90％，且其最大粒径≤3mm；普通超细铁粉的细度为-200目≥95％；
所述的膨润土的粒度≤200目；
本实施例的高钒高铬型钒钛磁铁矿球团的制备方法，通过以下步骤实现：配料、烘干混合、加底水混料、焖料、造球、生球筛分、烘干预氧化、竖炉焙烧、冷却，具体步骤为：
步骤1，配料
按照高钒高铬型钒钛磁铁矿球团的原料组成及其重量份数比，称量原料，混合均匀，得到混合物料；
步骤2，烘干
将混合物料置于干燥箱中，在110℃进行烘干，直至混合物料含水率为7％，得到烘干后的混合物料；
步骤3，加底水混料、焖料
将烘干后的混合物料采用雾化加水的方式加入水，并混合均匀，然后用塑料袋覆盖加入水的混合物料，焖料40min，得到焖好的料；其中，加入水的量为烘干后的混合物料质量的2.2％；
步骤4，造球及筛分
将焖好的料置于圆盘造球机中，加入水，使得高钒高铬型钒钛磁铁矿生球含水率控制在10％，进行造球，通过筛分，得到粒度为9～16mm的高钒高铬型钒钛磁铁矿生球；
所述的筛分具体为辊筛，其具体为将圆盘造球机制得的高钒高铬型钒钛磁铁矿生球通过筛辊之间的间隙进行筛分，粒度为9～16mm的高钒高铬型钒钛磁铁矿生球进入下一步骤，粒度小于9mm的高钒高铬型钒钛磁铁矿生球返回至步骤5的圆盘造球机继续造球，粒度大于16mm的高钒高铬型钒钛磁铁矿生球经过破碎成矿粉，返回至步骤5的圆盘造球机造球。
制备的高钒高铬型钒钛磁铁矿球团的生球粒度为6～12mm，生球落下强度为2次/个，抗压强度7N/个。
步骤5，烘干预氧化
将粒度为9～16mm的通过布料机均匀的布入竖炉炉顶处的烘干床内，在烘干床内经过烘干脱水预热氧化，得到烘干预氧化的高钒高铬型钒钛磁铁矿球团，其中，烘干床温度控制为750℃、烟罩温度控制为210℃、料层厚度控制为140mm、烘干时间为9min；
烘干预氧化的高钒高铬型钒钛磁铁矿球团的抗压强度为200N/个。
步骤6，竖炉焙烧
将烘干预氧化的高钒高铬型钒钛磁铁矿球团置于竖炉中进行焙烧，得到焙烧后的高钒高铬型钒钛磁铁矿球团；其焙烧工艺为：燃烧室温度为1250℃、燃烧室压力为11kPa、煤气压力为20kPa、助燃风压力为18kPa，焙烧时间为10min；
步骤7，冷却
将焙烧后的高钒高铬型钒钛磁铁矿球团，随炉冷却后，从竖炉炉底排出，得到高钒高铬型钒钛磁铁矿球团。
焙烧后的高钒高铬型钒钛磁铁矿球团的抗压强度为1520N/个，还原膨胀率为25％。

Claims (6)

  1. 一种高钒高铬型钒钛磁铁矿球团，其特征在于，该高钒高铬型钒钛磁铁矿球团包含的TFe为61.88～64.22wt.％，包含的化学成分及其质量百分比为：Fe 2O 3：87.51～91.41％，FeO：0.3～0.8％，V 2O 5：0.45～0.62％，TiO 2：2.29～3.20％，Cr 2O 3：0.22～0.48％，CaO：0.11～0.63％，SiO 2：3.18～4.77％，MgO：0.32～0.89％，Al 2O 3：1.62～4.0％，余量为不可避免的杂质。
  2. 如权利要求1所述的高钒高铬型钒钛磁铁矿球团，其特征在于，制备的高钒高铬型钒钛磁铁矿球团的生球粒度为8～16mm，生球落下强度为≥4次/个，抗压强度≥10N/个，烘干预氧化的高钒高铬型钒钛磁铁矿球团的抗压强度为≥300N/个，焙烧后的高钒高铬型钒钛磁铁矿球团的抗压强度为≥2200N/个，球团的还原膨胀率≤16.4％。
  3. 如权利要求1所述的高钒高铬型钒钛磁铁矿球团，其特征在于，高钒高铬型钒钛磁铁矿球团由润磨后的高钒高铬型钒钛磁铁矿粉、铁料和膨润土制备而成，其中，各个成分的重量份数比为：
    润磨后的高钒高铬型钒钛磁铁矿粉：51～56份，铁料：44～49份，膨润土：0.8～1.1份。
  4. 如权利要求1所述的高钒高铬型钒钛磁铁矿球团，其特征在于，所述的润磨后的高钒高铬型钒钛磁铁矿粉是进口高钒高铬型钒钛磁铁矿进行润磨得到的细度为-200目≥90％的高钒高铬型钒钛磁铁矿粉，其包含的TFe为61～63wt.％，包含的化学成分及其质量百分比为：FeO：26～28％，Fe 3O 4：54.06～58.97％，V 2O 5：0.9～1.1％，TiO 2：4.5～5.5％，Cr 2O 3：0.45～0.85％，CaO：0.16～0.26％，SiO 2：2～3％，MgO：0.5～1.0％，Al 2O 3：2.5～4.0％，余量为不可避免的杂质。
  5. 如权利要求1所述的高钒高铬型钒钛磁铁矿球团，其特征在于，所述的铁料含有的成分及其重量份数为：普通铁矿粉：70～100份；普通超细铁粉：0～30份；
    其中，普通铁矿粉的粒径≤0.5mm的占90％，且其最大粒径≤3mm；
    普通超细铁粉的细度为-325目≥85％或-200目≥95％。
  6. 如权利要求1所述的高钒高铬型钒钛磁铁矿球团，其特征在于，所述的膨润土的粒度≤200目，其含有的成分及其质量百分比为：SiO 2：66～69％，Al 2O 3：13～16％，MgO：4～5％，CaO：2～3％，Na 2O≤1.7％，K 2O≤1.2％，余量为不可避免的杂质。
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