CN112899471A - Method for preparing large-size composite vanadium-titanium pellet ore - Google Patents
Method for preparing large-size composite vanadium-titanium pellet ore Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C—CHEMISTRY; METALLURGY
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- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
- C22B1/22—Sintering; Agglomerating in other sintering apparatus
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- 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
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- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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Abstract
The invention belongs to the technical field of ferrous metallurgy, and relates to a method for preparing large-size composite vanadium-titanium pellets, which comprises the following steps: s1, batching: taking vanadium titano-magnetite raw ore powder and vanadium titano-magnetite sinter return ore as raw material ores, and adding an additive, a binder and water into the raw material ores to obtain a mixture; s2, pelletizing: pelletizing the mixture obtained in the step S1 by using a disc pelletizer or a pair of roller press pelletizer, wherein the diameter of the green pellets after pelletizing is 20-40 mm; s3, high-temperature reductive roasting: conveying the green pellets in the S2 to a horizontal atmosphere roasting furnace, drying and reducing and roasting the green pellets by using high-temperature metallurgical byproduct furnace gas for 20-40 min to prepare vanadium-titanium pellet ore, and naturally cooling for later use; s4, furnace gas circulation: and enriching the roasting furnace gas used in the S3, and introducing the roasting furnace gas into the horizontal atmosphere roasting furnace of the S3 for recycling. The invention improves the recovery and utilization rate of ferrous metallurgy byproduct resources to the maximum extent and reduces the energy consumption of the whole process.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a method for preparing large-size composite vanadium-titanium pellets.
Background
The pellet mentioned in the invention especially refers to the full vanadium-titanium acidic or alkaline pellet used in the blast furnace of chromium-containing vanadium-titanium magnetite. The existing pelletizing process mainly uses a 'grate-kiln' process, the main problem is that the cost is too high, the magnetite proportion in the vanadium titano-magnetite pellets is high, the reduction reaction of a lump belt in a blast furnace is not facilitated, and the magnetite needs to be converted into hematite through two sections of oxidizing roasting of the grate-kiln, so the process link is long, the energy consumption is high, and the cost is high. The main reasons for the unqualified pellets are that the strength is not enough, the diameter of the pellets is long in time, the yield per unit time is not matched with the requirement of a blast furnace, especially, the forming rate of the master pellets in the pelletizing process is low, the production rhythm is fast in the industrial process, the quality of the master pellets of the pellets is poor, the quality of the pellets which roll to grow is loose, the pellets are pulverized and crushed seriously in the transportation process, and the production efficiency is greatly influenced.
In addition, sintered ore of vanadium titano-magnetite is one of the main blast furnace pre-iron process products due to its high TiO content2And perovskite components with high proportion are generated, the low liquid phase proportion causes low strength of the sintering ore and high pulverization rate, and the low yield and high return rate are caused. In general, unqualified sintered ore is re-used as return ore in the sintering process in industry, which causes the rapid increase of industrial energy consumption and cost, and also aggravates the pollution of sulfide, nitride, carbon emission and the like caused by the sintering process.
Disclosure of Invention
Technical problem to be solved
Aiming at the key problems of long production flow, high cost, poor vanadium-titanium sintered mineral content and the like of vanadium-titanium pellets, the invention provides a method for preparing large-size composite vanadium-titanium pellets by combining sintered mineral powder and additives. The method recycles the burnt solid waste of the vanadium-titanium sinter, simultaneously combines the coal powder and coke powder solid waste generated by the pre-coking process of the iron coke, the urban plastic garbage (plastic particles and rubber particles) and the like as additives, quickly prepares large-size composite pellets by a hot/cold pressing method or a rolling ball method, and makes up the technical defects of long process and high energy consumption of the traditional pelletizing. The prepared product can meet the requirement of entering a blast furnace, and has better high-temperature load reduction reflow dropping performance.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
the invention provides a method for preparing large-size composite vanadium-titanium pellets, which comprises the following steps:
s1, batching: taking vanadium titano-magnetite raw ore powder and vanadium titano-magnetite sinter return ore as raw material ores, and adding an additive, a binder and water into the raw material ores to obtain a mixture;
s2, pelletizing: pelletizing the mixture obtained in the step S1 by using a disc pelletizer or a pair of roller press pelletizer, wherein the diameter of the green pellets after pelletizing is 20-40 mm;
s3, high-temperature reductive roasting: conveying the green pellets in the S2 to a horizontal atmosphere roasting furnace, drying and reducing and roasting the green pellets by using high-temperature metallurgical byproduct furnace gas for 20-40 min to prepare vanadium-titanium pellet ore, and naturally cooling for later use;
s4, furnace gas circulation: and enriching the roasting furnace gas used in the S3, and introducing the roasting furnace gas into the horizontal atmosphere roasting furnace of the S3 for recycling.
Further, step S1 includes the following processing:
s11, screening: screening raw ore powder of the vanadium titano-magnetite under a sieve of 35 meshes, screening return ores of the vanadium titano-magnetite sinter under a sieve of 30 meshes after grinding, and screening under a sieve of 30 meshes after grinding the additive;
s12, mixing materials: mixing the raw material, the additive, the binder and the water which are sieved in the S11 according to a mass ratio of 80-90: 3-10: 1-3: 4-10, and fully mixing and stirring to obtain a mixture.
Further, in S1, the mass of the return ores of the vanadium titano-magnetite sinter ore accounts for 5-40% of the mineral content of the raw material.
Further, in S12, the weight parts of the raw material, the additive, the binder and the water are 100 parts, and the specific content of the water is adjusted and added according to the alkaline components of the pellets.
Further, in S1, the raw vanadium titano-magnetite powder includes the following components by mass: TFe: 52-58%; CaO: 0.5-1.5%; MgO: 2.0-4.0%; al (Al)2O3：2.0～3.5％；SiO2：3.5～5.5％；Cr2O3：0.3～1.0％；V2O5：0.5～1.8％；TiO2：8.5～13.0％，P：<0.05％。
Further, in S1, the composition and mass fraction of the return ore of the vanadium titano-magnetite agglomerate are: TFe: 43-50%; CaO: 8.0-10.5%; MgO: 2.0-4.0%; al (Al)2O3：2.0～3.5％；SiO2：3.5～5.5％；Cr2O3：0.5～1.0％；V2O5：0.5～1.2％；TiO2：9.5～11.5％，P：<0.03％。
Further, in S1, the particle size of the vanadium titano-magnetite raw ore is normally distributed, wherein: 3% of the particles with the particle size of less than 100 meshes, 95% of the particles with the particle size of less than 50 meshes and 97% of the particles with the particle size of less than 35 meshes.
Further, in S1, the additives include coal dust and coke dust solid waste resources in the coking process, polyethylene plastic particles and rubber particles; if alkaline pellets are prepared, the additive also comprises pure CaO, MgO and CaCO3、MgCO3One or more of the above, or dolomite or fluorite containing 1-10% of the above components.
Further, in S1, the binder is sodium bentonite or calcium bentonite.
Further, in S3, the high-temperature metallurgical by-product furnace gas refers to blast furnace gas, converter furnace gas and mixed furnace gas of coke oven gas which do not reach the recovery index; high temperature metallurgyThe average temperature of the byproduct furnace gas is 800-1400 ℃, and the components and the mass fractions are respectively as follows: CO: 30-40% of CO2：10～25％，H2：5～8％，N2：30～40％，O2：1～3％，CH4：2～7％，H2O: and (4) saturation.
Further, in S4, the roasting furnace gas is introduced into the gasification furnace, and then the low-calorific-value roasting furnace gas is enriched by injecting coal powder, coke powder, polyethylene plastic particles and rubber particles, namely CO in the low-calorific-value roasting furnace gas2The carbon-containing substance is combusted to generate gasification reaction to generate CO and H2、CH4And reducing gas is used for improving the physical heat value of the furnace gas.
(III) advantageous effects
The invention has the beneficial effects that: the preparation method provided by the invention fully utilizes the solid waste resources of the pre-iron sintering and coking processes and the byproduct furnace gas resources in the steel production, improves the recovery utilization rate of the ferrous metallurgy byproduct resources to the maximum extent, and reduces the overall process energy consumption. Compared with the traditional pelletizing process, the process shortens the process flow and time, provides a process technology different from the traditional pelletizing, improves the production efficiency, obtains the compressive strength of the traditional pellets which is 10-20% higher than that of the traditional process, and improves the pelletizing rate, the pelletizing rate of the traditional pellet preparation process is 60-70%, the pelletizing rate of the pellet preparation process is more than 90%, the requirement of blast furnace smelting is met, and a new idea is provided for simplifying blast furnace burden.
Drawings
FIG. 1 is a schematic view of the process flow of the invention for producing large-size composite vanadium-titanium pellets by combining sintering ore powder, coal powder and coke powder.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present invention by way of specific embodiments thereof.
The invention aims to break through the traditional pellet production method, provides a new pellet production process, fully utilizes the byproduct solid waste resource of the pre-iron process, greatly shortens the pellet production time, improves the production efficiency and pellet quality, and provides new productivity for metallurgical production. Grinding the return ores of the sintered ores to 30 meshes, mixing the return ores of the sintered ores with additives such as vanadium-titanium magnetite raw ores, coal powder, coke powder and the like according to a certain proportion, pelletizing by using a disc pelletizer or a pair-roller pelletizer, wherein the green pellet size is 20-40 mm, and rapidly forming for later use through one-step high-temperature roasting. The invention provides a key technology for preparing pellets for a blast furnace with high efficiency, high quality and low cost, which not only can realize the low-energy consumption and low-pollution furnace burden structure of low sintering of high pellets of the blast furnace, but also is beneficial to the ecological framework of the large circulation of the byproduct resources of the whole process of ferrous metallurgy, and has important significance for realizing resource saving, energy conservation and emission reduction. The invention can also improve the balling rate of the pellets, which can also be called the material ratio, for example, the invention can prepare raw pellets of about 1.5kg from 2kg of raw material ore. The green pellet is not roasted, is called green pellet only by rolling and is called pellet or composite pellet after roasting.
Referring to fig. 1, the invention provides a method for preparing large-size composite vanadium-titanium pellets, which comprises the following steps:
s1, batching: taking vanadium titano-magnetite raw ore powder and vanadium titano-magnetite sinter return ore as raw material ores, and adding an additive, a binder and water into the raw material ores to obtain a mixture; wherein, the mass of the return ores of the vanadium titano-magnetite sinter ore accounts for 5 to 40 percent of the mineral content of the raw material;
s2, pelletizing: pelletizing the mixture obtained in the step S1 by using a disc pelletizer or a pair of roller press pelletizer, wherein the diameter of the green pellets after pelletizing is 20-40 mm;
s3, high-temperature reductive roasting: conveying the green pellets in the S2 to a horizontal atmosphere roasting furnace, drying and reducing and roasting the green pellets by using high-temperature metallurgical byproduct furnace gas for 20-40 min to prepare vanadium-titanium pellet ore, and naturally cooling for later use;
s4, furnace gas circulation: and enriching the roasting furnace gas used in the S3, and introducing the roasting furnace gas into the horizontal atmosphere roasting furnace of the S3 for recycling.
Specifically, the addition amount of return ores of the vanadium titano-magnetite sintered ore is within the range of 5-40%, and the average compressive strength of the prepared pellet ore is greater than 2000N, so that the production requirement of a blast furnace is met. Wherein, because the return mine of the vanadium titano-magnetite agglomerate has poor water absorption and poor self-bonding effect, the larger the adding proportion is, the more difficult the agglomeration of the prepared pellets is, and the compressive strength is in a trend of increasing firstly and then reducing. When the addition amount is 10-20%, the optimal compressive strength is achieved, and the average compressive strength is about 2500N.
Wherein, step S1 includes the following processing:
s11, screening: screening raw ore powder of the vanadium titano-magnetite under a sieve of 35 meshes, screening return ores of the vanadium titano-magnetite sinter under a sieve of 30 meshes after grinding, and screening under a sieve of 30 meshes after grinding the additive;
s12, mixing materials: mixing the raw material, the additive, the binder and the water which are sieved in the S11 according to a mass ratio of 80-90: 3-10: 1-3: 4-10, and fully mixing and stirring to obtain a mixture. Here, it should be noted that: the weight parts of the raw materials, the additives, the binding agent and the water are 100 parts, and the specific content of the water is adjusted and added according to the alkaline components of the pellets.
Specifically, in the step S1,
the vanadium titano-magnetite raw ore comprises the following components in percentage by mass: TFe: 52-58%; CaO: 0.5-1.5%; MgO: 2.0-4.0%; al (Al)2O3：2.0～3.5％；SiO2：3.5～5.5％；Cr2O3：0.3～1.0％；V2O5：0.5～1.8％；TiO2：8.5～13.0％，P：<0.05％。
The composition and the mass fraction of the return ores of the sinter ore are respectively as follows: TFe: 43-50%; CaO: 8.0-10.5%; MgO: 2.0-4.0%; al (Al)2O3：2.0～3.5％；SiO2：3.5～5.5％；Cr2O3：0.5～1.0％；V2O5：0.5～1.2％；TiO2：9.5～11.5％，P：<0.03％。
In S1, the particle size of the vanadium titano-magnetite raw ore is as follows: the particle size is less than 3% of 100 mesh, 95% of 50 mesh and 97% of 35 mesh, and meets the normal distribution.
In S1, the additive includes coal powder, coke powder and waste resource in coking process, polyethyleneThe average particle size of the olefin plastic particles and the rubber particles is about 30 meshes. In addition, if alkaline pellets are prepared, pure CaO, MgO, CaCO may be added3Or MgCO3One or more of the above, or dolomite or fluorite containing 1-10% of the above components.
In S1, the binder is sodium-based or calcium-based bentonite.
In S3, the high-temperature metallurgical by-product furnace gas refers to mixed furnace gas of blast furnace gas, converter furnace gas and coke oven gas which does not reach the recovery index, the average temperature of the mixed furnace gas is 800-1400 ℃, and the components and the mass fractions of the mixed furnace gas are respectively as follows: CO: 30-40% of CO2：10～25％，H2：5～8％，N2：30～40％，O2：1～3％，CH4And the like: 2 to 7% of H2O: and (4) saturation.
S4, introducing the roasting furnace gas into a gasification furnace, and enriching the low-heat-value furnace gas by injecting coal powder, coke powder, waste plastics and rubber, namely, CO in the low-heat-value furnace gas2The carbon-containing substance is combusted to generate gasification reaction to generate CO and H2、CH4Reducing gas, and improving physical heat value of the furnace gas.
According to the invention, the large-size composite vanadium-titanium pellet ore is prepared by using the return ores of the sintered ore, the raw ores of the vanadium-titanium magnetite ore, coal powder, coke powder and other additives, and the compressive strength of the prepared vanadium-titanium pellet ore product can reach 2500-3500N, which is 10-20% higher than that of the traditional process; the reduction degradation rate is low, the reduction degradation rate is 1-5%, the softening temperature of high-temperature load reduction softening dropping is low, the softening temperature is 1200-1250 ℃, the melting temperature and the dropping temperature are higher, the melting temperature is 1350-1380 ℃, the dropping temperature is 1420-1520 ℃, the molten drop interval is narrow, the ventilation property and the production efficiency of blast furnace smelting are favorably improved, the content of titanium carbonitride in furnace slag is low, and the phenomena of slag gushing, slag iron difficult separation, foam slag and the like are obviously improved.
The process of the present invention is described in detail below by means of specific examples.
Example 1
A method for preparing large-size composite vanadium-titanium pellets comprises the following steps:
s1, batching: taking vanadium titano-magnetite raw ore powder and vanadium titano-magnetite sinter return ore as raw material ores, and adding an additive, a binder and water into the raw material ores to obtain a mixture; wherein the mass of the return ores of the vanadium titano-magnetite sinter ore accounts for 5% of the mineral content of the raw material;
s2, pelletizing: pelletizing the mixture obtained in the step S1 by using a disc pelletizer or a pair of roller press pelletizer, wherein the diameter of the green pellets after pelletizing is 20-40 mm;
s3, high-temperature reductive roasting: conveying the green pellets in the S2 to a horizontal atmosphere roasting furnace, drying and reducing and roasting the green pellets by using high-temperature metallurgical byproduct furnace gas for 20min to prepare vanadium-titanium pellet ore, and naturally cooling for later use;
s4, furnace gas circulation: and enriching the roasting furnace gas used in the S3, and introducing the roasting furnace gas into the horizontal atmosphere roasting furnace of the S3 for recycling.
Wherein, step S1 includes the following processing:
s11, screening: screening raw ore powder of the vanadium titano-magnetite under a sieve of 35 meshes, screening return ores of the vanadium titano-magnetite sinter under a sieve of 30 meshes after grinding, and screening under a sieve of 30 meshes after grinding the additive;
s12, mixing materials: mixing the raw material, the additive, the binder and the water which are sieved in the S11 according to a mass ratio of 80: 9: 1: 10, fully mixing and stirring to obtain a mixture.
The vanadium-titanium pellet produced according to the method of this example had compressive strength of 2500N, reduction degradation rate of 1%, softening temperature of 1250 ℃, melting temperature of 1350 ℃, and dropping temperature of 1420 ℃.
Example 2
A method for preparing large-size composite vanadium-titanium pellets comprises the following steps:
s1, batching: taking vanadium titano-magnetite raw ore powder and vanadium titano-magnetite sinter return ore as raw material ores, and adding an additive, a binder and water into the raw material ores to obtain a mixture; wherein the mass of the return ores of the vanadium titano-magnetite sinter ore accounts for 40% of the mineral content of the raw material;
s2, pelletizing: pelletizing the mixture obtained in the step S1 by using a disc pelletizer or a pair of roller press pelletizer, wherein the diameter of the green pellets after pelletizing is 20-40 mm;
s3, high-temperature reductive roasting: conveying the green pellets in the S2 to a horizontal atmosphere roasting furnace, drying and reducing and roasting the green pellets by using high-temperature metallurgical byproduct furnace gas for 40min to prepare vanadium-titanium pellet ore, and naturally cooling for later use;
s4, furnace gas circulation: and enriching the roasting furnace gas used in the S3, and introducing the roasting furnace gas into the horizontal atmosphere roasting furnace of the S3 for recycling.
Wherein, step S1 includes the following processing:
s11, screening: screening raw ore powder of the vanadium titano-magnetite under a sieve of 35 meshes, screening return ores of the vanadium titano-magnetite sinter under a sieve of 30 meshes after grinding, and screening under a sieve of 30 meshes after grinding the additive;
s12, mixing materials: mixing the raw material, the additive, the binder and the water which are sieved in the S11 according to a mass ratio of 90: 3: 3: 4, fully mixing and stirring to obtain a mixture.
The vanadium-titanium pellets produced according to the method of this example had a compressive strength of 2500N, a reduction degradation rate of 2%, a softening temperature of 1200 deg.C, a melting temperature of 1380 deg.C, and a dropping temperature of 1520 deg.C.
Example 3
A method for preparing large-size composite vanadium-titanium pellets comprises the following steps:
s1, batching: taking vanadium titano-magnetite raw ore powder and vanadium titano-magnetite sinter return ore as raw material ores, and adding an additive, a binder and water into the raw material ores to obtain a mixture; wherein the mass of the return ores of the vanadium titano-magnetite sinter ore accounts for 20% of the mineral content of the raw material;
s2, pelletizing: pelletizing the mixture obtained in the step S1 by using a disc pelletizer or a pair of roller press pelletizer, wherein the diameter of the green pellets after pelletizing is 20-40 mm;
s3, high-temperature reductive roasting: conveying the green pellets in the S2 to a horizontal atmosphere roasting furnace, drying and reducing and roasting the green pellets by using high-temperature metallurgical byproduct furnace gas for 30min to prepare vanadium-titanium pellet ore, and naturally cooling the vanadium-titanium pellet ore for later use;
s4, furnace gas circulation: and enriching the roasting furnace gas used in the S3, and introducing the roasting furnace gas into the horizontal atmosphere roasting furnace of the S3 for recycling.
Wherein, step S1 includes the following processing:
s11, screening: screening raw ore powder of the vanadium titano-magnetite under a sieve of 35 meshes, screening return ores of the vanadium titano-magnetite sinter under a sieve of 30 meshes after grinding, and screening under a sieve of 30 meshes after grinding the additive;
s12, mixing materials: mixing the raw material, the additive, the binder and the water which are sieved in the S11 according to a mass ratio of 82: 10: 2: and 6, fully mixing and stirring to obtain a mixture.
The vanadium-titanium pellet produced according to the method of this example had a compressive strength of 3000N, a reduction degradation rate of 3%, a softening temperature of 1210 ℃, a melting temperature of 1360 ℃ and a dropping temperature of 1450 ℃.
Example 4
A method for preparing large-size composite vanadium-titanium pellets comprises the following steps:
s1, batching: taking vanadium titano-magnetite raw ore powder and vanadium titano-magnetite sinter return ore as raw material ores, and adding an additive, a binder and water into the raw material ores to obtain a mixture; wherein the mass of the return ores of the vanadium titano-magnetite sinter ore accounts for 30% of the mass of the raw material ore;
s2, pelletizing: pelletizing the mixture obtained in the step S1 by using a disc pelletizer or a pair of roller press pelletizer, wherein the diameter of the green pellets after pelletizing is 20-40 mm;
s3, high-temperature reductive roasting: conveying the green pellets in the S2 to a horizontal atmosphere roasting furnace, drying and reducing and roasting the green pellets by using high-temperature metallurgical byproduct furnace gas for 35min to prepare vanadium-titanium pellet ore, and naturally cooling for later use;
s4, furnace gas circulation: and enriching the roasting furnace gas used in the S3, and introducing the roasting furnace gas into the horizontal atmosphere roasting furnace of the S3 for recycling.
Wherein, step S1 includes the following processing:
s11, screening: screening raw ore powder of the vanadium titano-magnetite under a sieve of 35 meshes, screening return ores of the vanadium titano-magnetite sinter under a sieve of 30 meshes after grinding, and screening under a sieve of 30 meshes after grinding the additive;
s12, mixing materials: mixing the raw material, the additive, the binder and the water which are sieved in the S11 according to a mass ratio of 88: 5: 2: and 5, fully mixing and stirring to obtain a mixture.
The vanadium-titanium pellets produced according to the method of this example had a compressive strength of 2800N, a reduction degradation rate of 5%, a softening temperature of 1200 c, a melting temperature of 1380 c and a dropping temperature of 1420 c.
Example 5
A method for preparing large-size composite vanadium-titanium pellets comprises the following steps:
s1, batching: taking vanadium titano-magnetite raw ore powder and vanadium titano-magnetite sinter return ore as raw material ores, and adding an additive, a binder and water into the raw material ores to obtain a mixture; wherein the mass of the return ores of the vanadium titano-magnetite sinter ore accounts for 15% of the mineral content of the raw material;
s2, pelletizing: pelletizing the mixture obtained in the step S1 by using a disc pelletizer or a pair of roller press pelletizer, wherein the diameter of the green pellets after pelletizing is 20-40 mm;
s3, high-temperature reductive roasting: conveying the green pellets in the S2 to a horizontal atmosphere roasting furnace, drying and reducing and roasting the green pellets by using high-temperature metallurgical byproduct furnace gas for 25min to prepare vanadium-titanium pellet ore, and naturally cooling for later use;
s4, furnace gas circulation: and enriching the roasting furnace gas used in the S3, and introducing the roasting furnace gas into the horizontal atmosphere roasting furnace of the S3 for recycling.
Wherein, step S1 includes the following processing:
s11, screening: screening raw ore powder of the vanadium titano-magnetite under a sieve of 35 meshes, screening return ores of the vanadium titano-magnetite sinter under a sieve of 30 meshes after grinding, and screening under a sieve of 30 meshes after grinding the additive;
s12, mixing materials: mixing the raw material, the additive, the binder and the water which are sieved in the S11 according to a mass ratio of 85: 6: 3: and 6, fully mixing and stirring to obtain a mixture.
The vanadium-titanium pellet produced according to the method of this example had a compressive strength of 3200N, a reduction degradation rate of 4%, a softening temperature of 1220 ℃, a melting temperature of 1370 ℃ and a dropping temperature of 1470 ℃.
Example 6
A method for preparing large-size composite vanadium-titanium pellets comprises the following steps:
s1, batching: taking vanadium titano-magnetite raw ore powder and vanadium titano-magnetite sinter return ore as raw material ores, and adding an additive, a binder and water into the raw material ores to obtain a mixture; wherein the mass of the return ores of the vanadium titano-magnetite sinter ore accounts for 25% of the mass of the raw material ore;
s2, pelletizing: pelletizing the mixture obtained in the step S1 by using a disc pelletizer or a pair of roller press pelletizer, wherein the diameter of the green pellets after pelletizing is 20-40 mm;
s3, high-temperature reductive roasting: conveying the green pellets in the S2 to a horizontal atmosphere roasting furnace, drying and reducing and roasting the green pellets by using high-temperature metallurgical byproduct furnace gas for 30min to prepare vanadium-titanium pellet ore, and naturally cooling the vanadium-titanium pellet ore for later use;
s4, furnace gas circulation: and enriching the roasting furnace gas used in the S3, and introducing the roasting furnace gas into the horizontal atmosphere roasting furnace of the S3 for recycling.
Wherein, step S1 includes the following processing:
s11, screening: screening raw ore powder of the vanadium titano-magnetite under a sieve of 35 meshes, screening return ores of the vanadium titano-magnetite sinter under a sieve of 30 meshes after grinding, and screening under a sieve of 30 meshes after grinding the additive;
s12, mixing materials: mixing the raw material, the additive, the binder and the water which are sieved in the S11 according to a mass ratio of 86: 7: 2: and 5, fully mixing and stirring to obtain a mixture.
The vanadium-titanium pellets produced according to the method of this example had a compressive strength of 3100N, a reduction degradation rate of 2%, a softening temperature of 1240 ℃, a melting temperature of 1370 ℃ and a dropping temperature of 1480 ℃.
Example 7
A method for preparing large-size composite vanadium-titanium pellets comprises the following steps:
s1, batching: taking vanadium titano-magnetite raw ore powder and vanadium titano-magnetite sinter return ore as raw material ores, and adding an additive, a binder and water into the raw material ores to obtain a mixture; wherein the mass of the return ores of the vanadium titano-magnetite sinter ore accounts for 10% of the mineral content of the raw material;
s2, pelletizing: pelletizing the mixture obtained in the step S1 by using a disc pelletizer or a pair of roller press pelletizer, wherein the diameter of the green pellets after pelletizing is 20-40 mm;
s3, high-temperature reductive roasting: conveying the green pellets in the S2 to a horizontal atmosphere roasting furnace, drying and reducing and roasting the green pellets by using high-temperature metallurgical byproduct furnace gas for 25min to prepare vanadium-titanium pellet ore, and naturally cooling for later use;
s4, furnace gas circulation: and enriching the roasting furnace gas used in the S3, and introducing the roasting furnace gas into the horizontal atmosphere roasting furnace of the S3 for recycling.
Wherein, step S1 includes the following processing:
s11, screening: screening raw ore powder of the vanadium titano-magnetite under a sieve of 35 meshes, screening return ores of the vanadium titano-magnetite sinter under a sieve of 30 meshes after grinding, and screening under a sieve of 30 meshes after grinding the additive;
s12, mixing materials: mixing the raw material, the additive, the binder and the water which are sieved in the S11 according to a mass ratio of 84: 8: 2: and 6, fully mixing and stirring to obtain a mixture.
The vanadium-titanium pellet produced according to the method of this example had compressive strength of 3300N, reduction degradation rate of 3%, softening temperature of 1230 c, melting temperature of 1360 c, and dropping temperature of 1500 c.
Example 8
A method for preparing large-size composite vanadium-titanium pellets comprises the following steps:
s1, batching: taking vanadium titano-magnetite raw ore powder and vanadium titano-magnetite sinter return ore as raw material ores, and adding an additive, a binder and water into the raw material ores to obtain a mixture; wherein the mass of the return ores of the vanadium titano-magnetite sinter ore accounts for 20% of the mineral content of the raw material;
s2, pelletizing: pelletizing the mixture obtained in the step S1 by using a disc pelletizer or a pair of roller press pelletizer, wherein the diameter of the green pellets after pelletizing is 20-40 mm;
s3, high-temperature reductive roasting: conveying the green pellets in the S2 to a horizontal atmosphere roasting furnace, drying and reducing and roasting the green pellets by using high-temperature metallurgical byproduct furnace gas for 30min to prepare vanadium-titanium pellet ore, and naturally cooling the vanadium-titanium pellet ore for later use;
s4, furnace gas circulation: and enriching the roasting furnace gas used in the S3, and introducing the roasting furnace gas into the horizontal atmosphere roasting furnace of the S3 for recycling.
Wherein, step S1 includes the following processing:
s11, screening: screening raw ore powder of the vanadium titano-magnetite under a sieve of 35 meshes, screening return ores of the vanadium titano-magnetite sinter under a sieve of 30 meshes after grinding, and screening under a sieve of 30 meshes after grinding the additive;
s12, mixing materials: mixing the raw material, the additive, the binder and the water which are sieved in the S11 according to a mass ratio of 89: 5: 3: and 3, fully mixing and stirring to obtain a mixture.
The vanadium-titanium pellet produced according to the method of this example had a compressive strength of 3500N, a reduction degradation rate of 5%, a softening temperature of 1210 ℃, a melting temperature of 1370 ℃ and a dropping temperature of 1490 ℃.
Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and not restrictive, and that those skilled in the art may make changes, modifications, substitutions and alterations to the above embodiments without departing from the scope of the present invention.
Claims (10)
1. A method for preparing large-size composite vanadium-titanium pellets is characterized by comprising the following steps:
s1, batching: taking vanadium titano-magnetite raw ore powder and vanadium titano-magnetite sinter return ore as raw material ores, and adding an additive, a binder and water into the raw material ores to obtain a mixture;
s2, pelletizing: pelletizing the mixture obtained in the step S1, wherein the diameter of the green pellets after pelletizing is 20-40 mm;
s3, high-temperature reductive roasting: conveying the green pellets in the S2 into a furnace, drying and reducing roasting the green pellets by using high-temperature metallurgical byproduct furnace gas for 20-40 min to prepare vanadium-titanium pellet ore, and naturally cooling for later use;
s4, furnace gas circulation: and enriching the roasting furnace gas used in the S3, and introducing the roasting furnace gas into the S3 furnace for recycling.
2. The method of claim 1,
the step S1 includes the following processes:
s11, screening: screening raw ore powder of the vanadium titano-magnetite under a sieve of 35 meshes, screening return ores of the vanadium titano-magnetite sinter under a sieve of 30 meshes after grinding, and screening under a sieve of 30 meshes after grinding the additive;
s12, mixing materials: mixing the raw material, the additive, the binder and the water which are sieved in the S11 according to a mass ratio of 80-90: 3-10: 1-3: 4-10, and fully mixing and stirring to obtain a mixture.
3. The method of claim 1,
in S1, the mass of the return ores of the vanadium titano-magnetite sinter ore accounts for 5-40% of the mineral content of the raw material.
4. The method of claim 1,
in S1, the vanadium titano-magnetite raw ore powder comprises the following components in percentage by mass: TFe: 52-58%; CaO: 0.5-1.5%; MgO: 2.0-4.0%; al (Al)2O3：2.0～3.5％；SiO2：3.5～5.5％；Cr2O3：0.3～1.0％；V2O5：0.5～1.8％；TiO2：8.5～13.0％，P：<0.05％。
5. The method of claim 1,
in S1, the vanadium titano-magnetite sinter return ore comprises the following components in percentage by mass: TFe: 43-50%; CaO: 8.0-10.5%; MgO: 2.0-4.0%; al (Al)2O3：2.0～3.5％；SiO2：3.5～5.5％；Cr2O3：0.5～1.0％；V2O5：0.5～1.2％；TiO2：9.5～11.5％，P：<0.03％。
6. The method of claim 1,
in S1, the particle size of the vanadium titano-magnetite raw ore is normally distributed, wherein: 3% of the particles with the particle size of less than 100 meshes, 95% of the particles with the particle size of less than 50 meshes and 97% of the particles with the particle size of less than 35 meshes.
7. The method of claim 1,
in S1, the additives comprise coal dust and coke dust solid waste resources in a coking process, polyethylene plastic particles and rubber particles; if alkaline pellets are prepared, the additive also comprises pure CaO, MgO and CaCO3、MgCO3One or more of the above, or dolomite or fluorite containing 1-10% of the above components.
8. The method of claim 1,
in S1, the binder is sodium bentonite or calcium bentonite.
9. The method of claim 1,
in S3, the high-temperature metallurgical by-product furnace gas refers to blast furnace gas, converter gas and mixed furnace gas of coke oven gas which do not reach the recovery index; the average temperature of the high-temperature metallurgy byproduct furnace gas is 800-1400 ℃, and the high-temperature metallurgy byproduct furnace gas comprises the following components in percentage by mass: CO: 30-40% of CO2：10～25％，H2：5～8％，N2：30～40％，O2：1～3％，CH4：2～7％，H2O: and (4) saturation.
10. The method of claim 1,
s4, introducing the roasting furnace gas into a gasification furnace, and enriching the low-heat-value roasting furnace gas by injecting coal powder, coke powder, polyethylene plastic particles and rubber particles, namely, CO in the low-heat-value roasting furnace gas2With combustion of carbonaceous material to effect gasification reactionTo produce CO, H2、CH4And the reducing gas is used for improving the physical heat value of the furnace gas.
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