CN115198115A - Method for preparing rock wool and vanadium-containing pig iron by smelting stone coal vanadium ore in blast furnace - Google Patents
Method for preparing rock wool and vanadium-containing pig iron by smelting stone coal vanadium ore in blast furnace 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
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- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
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- C03C13/06—Mineral fibres, e.g. slag wool, mineral wool, rock wool
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- C22B1/00—Preliminary treatment of ores or scrap
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Abstract
The invention provides a method for preparing rock wool and vanadium-containing pig iron by smelting stone coal vanadium ore in a blast furnace, belonging to the field of energy-saving building materials and the field of metallurgy. Mixing stone coal vanadium ore, steel-making slag, iron ore powder and coke powder and then sintering to obtain sintered ore; then, the sintered ore and coke are smelted in a blast furnace to obtain acid slag with the acidity coefficient of 1.2-2.0 and vanadium-containing pig iron; the acid slag is subjected to heat preservation and refining to directly prepare rock wool. The invention adopts blast furnace smelting stone coal vanadium ore, replaces the existing stone coal water method vanadium extraction process with blast furnace fire metallurgy process, and has no HCl and Cl in the production process 2 The gas and the toxic high valence vanadium oxide, the pentavalent vanadium ion and a large amount of waste residues are generated to produce the acidityThe slag with the coefficient of 1.2-2.0 can be used for manufacturing various high-quality rock wool, the by-product vanadium-containing pig iron can be used as a raw material for steel smelting, solid products can be fully recovered, resource utilization of stone coal vanadium ore and utilization of industrial waste are realized, and the production cost is low.
Description
Technical Field
The invention relates to the field of energy-saving building materials and metallurgy, in particular to a method for preparing rock wool and vanadium-containing pig iron by smelting stone coal vanadium ore in a blast furnace.
Background
China is rich in vanadium resources, and is a world with large vanadium resource reserves. At present, the vanadium ore resources in China mainly have two forms, namely vanadium titano-magnetite and vanadium-containing stone coal; wherein, the storage capacity of the stone coal vanadium ore is quite rich, the total storage capacity reaches 618.8 hundred million t, wherein V 2 O 5 The reserve of the content more than 0.5 is 7707.5 ten thousand, which is 6.7 times of the reserve of vanadium in the vanadium titano-magnetite in China. Therefore, vanadium extraction from stone coal is an important development direction for vanadium resource development in China.
From the last 70 th century, the process of roasting by a flat kiln sodium method, leaching by water, precipitating vanadium by acid, dissolving by alkali, precipitating ammonium metavanadate and calcining the finished vanadium pentoxide is mainly adopted in China, but the extraction rate of vanadium is low and is only 40-55%, and gas produced by roasting contains HCl and Cl 2 And the environment is seriously polluted. The direct acid leaching-extraction process of the stone coal vanadium ore designed by the Changsha nonferrous metallurgy design institute does not need roasting, does not produce gas pollution, has a total recovery rate of more than or equal to 68 percent, but has high acid consumption in the leaching process, long leaching time and more waste water and waste residue. The combined roasting-acid leaching/alkaline leaching process can effectively solve the problems of high acid consumption and long leaching time, but the toxic high-valence vanadium sewage is also generated in the production process, so that the problem that the waste water and the waste residues are difficult to recycle is solved.
Therefore, how to extract vanadium from stone coal vanadium ore without generating HCl and Cl 2 The gas, the toxic high-valence vanadium sewage and the waste residue realize the resource utilization of the stone coal vanadium ore, and become a technical problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a method for preparing rock wool and vanadium-containing pig iron by smelting stone coal vanadium ore in a blast furnace, and HCl and Cl are not generated in the production process of the method for smelting the stone coal vanadium ore in the blast furnace provided by the invention 2 Gas and toxic high-valence vanadium sewage are generated, solid products can be fully recovered, and resource utilization of the stone coal vanadium ore is realized.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a method for preparing rock wool and vanadium-containing pig iron by smelting stone coal vanadium ore in a blast furnace, which comprises the following steps:
(1) Mixing the stone coal navajoite, the steel-making slag, the iron ore powder and the coke powder, and then sintering to obtain a sintered ore;
(2) Performing blast furnace smelting on the sintered ore obtained in the step (1) and coke to obtain acid slag and vanadium-containing pig iron; the acidity coefficient of the acid slag is 1.2-2.0; the acid slag is directly prepared into rock wool after heat preservation and refining.
Preferably, V in the stone coal vanadium ore in the step (1) 2 O 5 The mass content of (A) is more than 0.5%.
Preferably, the steel-making slag in the step (1) is converter steel slag; the converter steel slag comprises vanadium-containing steel slag and/or ordinary steel slag.
Preferably, the mass ratio of the stone coal vanadium ore, the steel-making slag, the iron ore powder and the coke powder in the step (1) is (50-100): 2-50): 5-10.
Preferably, the sintering temperature in the step (1) is 1200-1400 ℃, and the sintering time is 30-40 min.
Preferably, the mass ratio of the total mass of the coke powder in the step (1) and the coke in the step (2) to the acid slag is 300-350 kg/t.
Preferably, the temperature of the blast furnace during the blast furnace smelting in the step (2) is 1450-1550 ℃.
Preferably, the temperature of the hot air in the blast furnace smelting in the step (2) is 900-1300 ℃.
Preferably, the time of the blast furnace smelting in the step (2) is 4 to 6 hours.
The invention provides a method for preparing rock wool and vanadium-containing pig iron by smelting stone coal vanadium ore in a blast furnace, which comprises the steps of mixing the stone coal vanadium ore, steel-making slag, iron ore powder and coke breeze and then sintering to obtain sintered ore; then, blast furnace smelting is carried out on the sintered ore and coke to obtain acid slag with the acidity coefficient of 1.2-2.0 and vanadium-containing pig iron; the acid slag is directly prepared into rock wool after heat preservation and refining. The invention adopts the blast furnace to smelt the stone coal vanadium ore,the blast furnace fire metallurgy process replaces the existing stone coal water method vanadium extraction process, and the production process does not contain HCl and Cl 2 The gas, the toxic high valence vanadium oxide, the pentavalent vanadium ion and a large amount of waste slag are generated, the produced slag with the acidity coefficient of 1.2-2.0 can be used for manufacturing various high-quality energy-saving rock wools, the by-product vanadium-containing pig iron can be used as a raw material for steel smelting, the solid product can be fully recovered, and the resource utilization of the stone coal vanadium ore is realized. The results of the examples show that the method for smelting stone coal vanadium ore in the blast furnace can not generate HCl and Cl 2 The acid slag with the acidity coefficient of 1.2-2.0 is produced under the condition of gas and waste water and can be directly used for rock wool production and vanadium-containing pig iron for steel smelting.
Drawings
FIG. 1 is a process flow chart of preparing rock wool and vanadium-containing pig iron by using acid slag from stone coal vanadium ore smelted by a blast furnace.
Detailed Description
The invention provides a method for preparing rock wool and vanadium-containing pig iron by smelting stone coal vanadium ore in a blast furnace, which comprises the following steps:
(1) Mixing the stone coal navajoite, the steel-making slag, the iron ore powder and the coke powder, and then sintering to obtain a sintered ore;
(2) Carrying out blast furnace smelting on the sintered ore obtained in the step (1) and coke to obtain acid slag and vanadium-containing pig iron; the acidity coefficient of the acid slag is 1.2-2.0; the acid slag is directly prepared into rock wool after heat preservation and refining.
In the present invention, the raw materials used are all commercial products which are conventional in the art, unless otherwise specified.
The method for preparing acid slag and vanadium-containing pig iron by smelting stone coal vanadium ore in a blast furnace provided by the invention is suitable for the stone coal vanadium ore in any mining area, preferably V, which is well known to those skilled in the art 2 O 5 The mass content of the stone coal vanadium ore is more than or equal to 0.5 percent.
The method mixes the stone coal vanadium ore, the steel-making slag, the iron ore powder and the coke powder and then sinters the mixture to obtain the sintered ore.
In the invention, the components of the stone coal vanadium ore are calculated according to the mass contentPreferably comprising V 2 O 5 0.2～3.8％，SiO 2 20～78％，S 1.58～1.75％，TC 5～16％，K 2 O 0.91～1.9％，BaO 0.72～1.87％，Al 2 O 3 1.53-17.39%, caO 0.2-13.8%, mgO 0.8-7.4%, ti 0.28-0.55%, and TFe 1.93-2.71%. In the present invention, the stone coal vanadium ore preferably further includes P < 1.53% by mass. In the present invention, the loss on ignition LOI of the stone coal vanadium ore is preferably 13.0 to 15.6%. In the embodiment of the invention, the stone coal vanadium ore is specifically stone coal vanadium ore in Baijiayuan of Xingshan, northwest China or Huainan stone coal vanadium ore in Hunan China.
In the present invention, the particle size of the stone coal vanadium ore is preferably-40 mesh.
In the present invention, the steel-making slag is preferably converter steel slag; the converter steel slag preferably comprises vanadium-containing steel slag and/or ordinary steel slag, and more preferably the vanadium-containing steel slag. In the present invention, the steel-making slag can provide iron oxide and alkali compounds, and the steel-making slag containing vanadium can also provide V 2 O 5 Meanwhile, the recycling of solid waste is realized, and the cost is low.
In the present invention, the steel-making slag preferably contains, in terms of mass content, caO.gtoreq.50%, mgO.gtoreq.7%, TFe.gtoreq.17%, and V 2 O 5 ≥1.0％。
In the present invention, the steel-making slag preferably has a particle size of-40 mesh.
The steel-making slag of the present invention is not particularly limited in its source, and steel slag produced during steel-making, which is known to those skilled in the art, may be used. In an embodiment of the present invention, the steel-making slag is specifically a Pan steel-making slag or a Steel-bearing steel-making slag.
In the present invention, the iron ore powder preferably contains, in terms of mass content, TFe not less than 50%, and SiO 2 ≤12％，CaO1.0％，MgO1.0％，P<0.05%, and S<0.05 percent. The invention has no special requirements on the source of the iron ore powder, and the iron ore powder well known by the technical personnel in the field can be adopted. In the invention, the iron ore powder preferentially generates ferrovanadium crystal in the reduction process, and then generates ferrovanadium-containing ore at high temperatureVanadium pig iron.
In the present invention, the particle size of the iron ore powder is preferably-40 mesh.
In the present invention, the fixed carbon content in the coke breeze is preferably 81% or more, more preferably 85% or more, by mass; the ash content in the coke breeze is preferably 19% or less.
In the present invention, the particle size of the coke breeze is preferably 1 to 5mm, more preferably 2 to 4mm. In the invention, the coke powder and coke are used as fuel for blast furnace smelting.
In the invention, the mass ratio of the stone coal vanadium ore, the steel-making slag, the iron ore powder and the coke powder is preferably (50-100) to (2-50) to (5-10), more preferably (60-90) to (10-40) to (6-9), and most preferably (70-80) to (20-30) to (7-8). The invention takes stone coal vanadium ore as the basis, adds recycled alkaline steel-making slag to reduce the acidity of the mixture, and increases the vanadium and iron content in the vanadium-containing pig iron; adding iron ore powder to react with iron oxide in the steel-making slag to make the iron oxide and vanadium in the stone coal vanadium ore generate vanadium-iron crystal preferentially at the upper part of the blast furnace, then reducing and melting the vanadium-containing iron and the slag at a high-temperature area at the lower part of the blast furnace, and having the function of finely adjusting the acidity coefficient of the slag; the acidity coefficient of the acid slag can be effectively controlled by controlling the proportion of each component within the range.
The operation of mixing the stone coal navajoite, the steel-making slag, the iron ore powder and the coke breeze is not particularly limited, and the components can be uniformly mixed by adopting the method well known by the technical personnel in the field. In the present invention, the mixing is preferably carried out in a drum mixer.
The invention preferably adopts an electronic computer to measure, the materials are automatically proportioned and fed according to the acidity coefficient of 1.2-2.0, the stability of the mixed materials is detected according to the numerical value +/-0.2 of the specified acidity coefficient as a limit value, and the detection result is qualified in the interval.
In the invention, the sintering temperature is preferably 1200-1400 ℃, and more preferably 1250-1350 ℃; the sintering time is preferably 30 to 40min, more preferably 35min. In the present invention, the sintering enables each raw material to satisfy the requirements of thermal strength and thermal stability in a blast furnace without pulverization.
The sintering apparatus of the present invention is not particularly limited, and may be any apparatus known to those skilled in the art for sintering. In the present invention, the sintering is preferably performed in a sintering machine.
After the sintered ore is obtained, the sintered ore and coke are smelted in a blast furnace to obtain acid slag and vanadium-containing pig iron.
In the present invention, the fixed carbon content in the coke is preferably 81% or more, more preferably 85% or more, by mass; the ash content in the coke is preferably 19% or less. In the present invention, the particle size of the coke is preferably not less than 50mm.
In the present invention, the mass ratio of the total mass of the coke breeze and coke to the acid slag is preferably 300 to 350kg/t, more preferably 310 to 340kg/t, and most preferably 320 to 330kg/t. In the invention, the large coke is added into the blast furnace for combustion reduction iron making, the coke powder is used for sintering ore fuel, and the coke ratio is controlled in the range, so that the heat production efficiency and the recovery rate of vanadium can be further improved.
In the present invention, the blast furnace smelting is preferably performed in a double-slag-hole blast furnace.
In the invention, the temperature of the hot air during the blast furnace smelting is preferably 900 to 1300 ℃, more preferably 1000 to 1200 ℃, and most preferably 1100 ℃. The air volume of the hot air during the blast furnace smelting is not specially limited, and the air volume is determined according to the volume of the blast furnace. In the invention, the temperature of the blast furnace during blast furnace smelting is preferably 1450-1550 ℃, more preferably 1400-1500 ℃, and most preferably 1450 ℃. In the present invention, the time for the blast furnace smelting is preferably 4 to 6 hours, more preferably 4.5 to 5.5 hours, and most preferably 5 hours. The invention controls the temperature of hot air and the temperature of the blast furnace during blast furnace smelting to lower the temperature of the upper part of the blast furnace, is beneficial to the preferential generation of vanadium-iron crystal by iron oxide on the upper part of the blast furnace and vanadium in stone coal vanadium ore, and then is reduced and melted in a high-temperature zone on the lower part of the blast furnace to generate vanadium-containing pig iron and slag.
In the present invention, the acid slag is preferably discharged through the slag outlet of the blast furnace; the vanadium-containing pig iron is preferably discharged through a taphole of the blast furnace, and then is subjected to slag-iron separation continuously through a slag holding device.
In the invention, the acidity coefficient of the acid slag is 1.2-2.0. In the present invention, the acid slag having the acidity coefficient within the above range can be used as a raw material for rock wool.
In the invention, the acid slag is directly prepared into rock wool after heat preservation and refining. The operation of preparing the rock wool from the acid slag is not particularly limited, and the rock wool can be prepared by adopting a four-roller centrifuge wire blowing system well known by the technical personnel in the field. In the embodiment of the invention, the process for preparing rock wool by using acid slag preferably comprises the following steps: and refining the acid slag by a slag heat-preservation refining electric furnace, and then sequentially passing through a four-roller centrifugal machine, a fiber forming chamber, a cotton collecting machine, a beating and wiping machine, a curing furnace, a slicing machine and a veneering machine to obtain the product rock wool.
In the present invention, the gas generated in the blast furnace process is preferably recovered for use in firing hot blast furnace hot blast for blast furnace or rock wool manufacturing.
In the present invention, the mass content of V in the vanadium-containing pig iron is preferably 0.4 to 10%. In the invention, the vanadium-containing pig iron can be directly used as a raw material for steel smelting. The invention preferably carries out the dephosphorization of the vanadium-containing pig iron to obtain an ingot or smelts the vanadium-containing pig iron into a 50 vanadium-silicon-iron ingot for use.
The process flow diagram for smelting the stone coal vanadium ore in the blast furnace is preferably as shown in fig. 1, and the stone coal vanadium ore powder, the iron ore powder, the steelmaking slag powder and the coke powder are mixed in a mixer, then sintered in a sintering machine to obtain sintered ore, and then the sintered ore and coke are smelted in the blast furnace to obtain acid slag and vanadium-containing molten iron; then refining the acid slag by a slag heat-preservation refining electric furnace, and then sequentially passing through a four-roller centrifuge, a fiber forming chamber, a cotton collecting machine, a beating and wiping machine, a curing furnace, a slicing machine and a veneering machine to obtain a product rock wool; smelting the vanadium-containing molten iron in a refining electric furnace to obtain vanadium-containing pig iron.
The invention adopts blast furnace smelting stone coal vanadium ore, replaces the existing stone coal water method vanadium extraction process with blast furnace fire method metallurgy process, and has no HCl and Cl in the production process 2 Gas andtoxic high-valence vanadium oxide, pentavalent vanadium ions and a large amount of waste residues are generated, the produced slag with the acidity coefficient of 1.2-2.0 can be used for manufacturing various high-quality energy-saving rock wool, a byproduct vanadium-containing pig iron can be used as a raw material for steel smelting, a solid product can be fully recovered, and the generated coal gas can be reused as hot air, so that the resource utilization of the stone coal vanadium ore is realized; meanwhile, the industrial solid waste steelmaking slag is used as a raw material, so that the recycling of the industrial solid waste is realized.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
100m 3 Blast furnace smelting is carried out for 500 tons of sintered ore in one day, 16.5 ten thousand tons of sintered ore are smelted in one year, 13.728 ten thousand tons of rock wool are produced in one year, and 2.97 ten thousand tons of vanadium-containing pig iron containing 2.62 vanadium are produced in one year.
Raw material sources and compositions are as follows:
stone coal vanadium ore: the stone coal vanadium ore of Baijiayuan of Xingshan of northwest China is crushed to-40 meshes, and the components are shown in the table 1.
TABLE 1 composition of stone coal vanadium ore from Baijiayuan of Xingshan, northwest of lake
| Composition (A) | V 2 O 5 | SiO 2 | S | TC | K 2 O | Ba | Al 2 O 3 | CaO | MgO | Ti | TFe |
| ％ | 1.30 | 44.2 | 1.58 | 5.8 | 1.9 | 0.72 | 17.39 | 13.8 | 7.4 | 0.55 | 2.71 |
Steel-making slag: the iron oxide-containing steel-bearing steel-making slag has a particle size of-40 meshes and the components are shown in Table 2.
TABLE 2 iron oxide-containing steel-making slag compositions
| Composition/parameter | CaO | SiO 2 | Al 2 O 3 | TFe | MgO | MnO | V 2 O 5 | Melting point | Viscosity of the oil |
| ％ | 51.17 | 10.17 | 1.96 | 17.4 | 7.36 | 2.7 | 2.0 | 1460℃ | 7.6Pa·S |
The particle size of the iron ore powder is-40 meshes, and the components are shown in Table 3.
TABLE 3 iron ore powder composition
| Composition (I) | TFe | SiO 2 | CaO | MgO | P | S |
| ％ | 50％ | 12％ | 1.0 | 1.0 | <0.05 | <0.05 |
The particle size of the coke is more than 50mm, the particle size of the coke powder is 1-5 mm, the fixed carbon in the coke and the coke powder is more than 81 percent, the ash content is less than 19 percent, and the ash content is shown in Table 4.
TABLE 4 Coke and breeze ash fractions
| Composition (I) | Fe 2 O 3 | Al 2 O 3 | SiO 2 | CaO | MgO |
| ％ | 12.08 | 21.08 | 1.09 | 13.07 | 1.09 |
The method for smelting the stone coal vanadium ore by the blast furnace comprises the following steps:
(1) Mixing stone coal navajoite, steel-making slag, iron ore powder and coke powder according to the mass ratio of 100;
TABLE 5 sinter chemistry
| Composition (I) | CaO | MgO | K 2 O | BaO | SiO 2 | Al 2 O 3 | TiO 2 | V 2 O 5 | TFe |
| ％ | 20.3 | 6.0 | 0.95 | 0.51 | 30 | 9.70 | 0.70 | 1.15 | 18 |
(2) Sintering ore obtained in the step (1) and coke with the grain diameter of 5-50 mm are added to the mixture of 100m 3 The blast furnace with double slag holes is used for continuous smelting, the air temperature is 1200 ℃, and the air quantity is 350m 3 The furnace temperature is 1450 ℃, the coke ratio is 350kg/t slag, acid slag and vanadium-containing pig iron are obtained, and the chemical components are respectively shown in tables 6 and 7; the acidity coefficient of the acid slag is 1.35, the yield of the acid slag is 416 t/day, and the annual yield is 13.728 ten thousand tons; the mass content of V in the vanadium-containing pig iron is 2.62%, the daily yield of the vanadium-containing pig iron is 90 tons, and the annual yield is 2.97 ten thousand tons.
TABLE 6 acid slag chemistry
| Composition (I) | CaO | MgO | K 2 O | BaO | SiO 2 | Al 2 O 3 | TiO 2 | V 2 O 3 | FeO |
| ％ | 27 | 5.0 | 0.85 | 0.51 | 33 | 11.2 | 0.70 | 0.1 | 1.0 |
TABLE 7 chemical composition of vanadium-containing pig iron
| Composition (I) | TFe | V | C | Si | Mn | Ti | P | S |
| ％ | 91.5 | 2.62 | 4.1 | 0.5 | 0.1 | Micro-scale | 0.05 | 0.1 |
The acid slag with the acidity coefficient of 1.35, which is prepared in the embodiment, is used for preparing rock wool, and the specific flow is shown in fig. 1: refining the acid slag by a slag heat-preservation refining electric furnace, and then sequentially passing through a four-roller centrifuge, a fiber forming chamber, a cotton collecting machine, a beating and wiping machine, a curing furnace, a slicing machine and a veneering machine to obtain a product rock wool; the performance data are as follows: 1. average diameter of rockwool 6.5 micron, 2, rockThe cotton product has a cotton product slag ball content (particle diameter greater than 0.25 mm) of not greater than 9.5% (mass fraction), 3, and density (kg/m) 3 ) =145,4, thermal conductivity (average temperature 70) 0 +3 Test Density 150kg/m 3 /[W/(m.k)]=0.043,5, heat load shrinkage temperature/° c =654.
Example 2
600m 3 3000 tons of sintered ore are smelted in one day by blast furnace smelting, 99 ten thousand tons of sintered ore are smelted in one year, 76 ten thousand tons of rock wool are prepared in one year, and 9.96 ten thousand tons of vanadium-containing pig iron containing 7.5 vanadium are prepared in one year.
Raw material sources and compositions are as follows:
stone coal vanadium ore: hunan Huaishan stone coal vanadium ore, the granularity is-40 meshes, the components are shown in Table 8, LOI 15.6 and the calorific value is 868 calories/g.
TABLE 8 Hunan Huaishi stone coal vanadium ore composition
Steel-making slag: the iron oxide-containing steel-bearing steel-making slag has a particle size of-40 meshes and the components are shown in Table 9.
TABLE 9 iron oxide-containing Steel-making slag compositions
| Composition/parameter | CaO | SiO 2 | Al 2 O 3 | TFe | MgO | MnO | V 2 O 5 | Melting Point | Viscosity of the oil |
| ％ | 51.17 | 10.2 | 1.96 | 17.4 | 7.36 | 2.7 | 2.0 | 1460℃ | 7.6Pa·S |
The particle size of the iron ore powder is-40 meshes, and the components are shown in Table 10.
TABLE 10 iron ore powder composition
| Composition (I) | TFe | SiO 2 | CaO | MgO | P | S |
| ％ | 50 | 12 | 1.0 | 1.0 | <0.05 | <0.05 |
The particle size of the coke is more than 50mm, the particle size of the coke powder is 1-5 mm, the fixed carbon in the coke and the coke powder is more than 81 percent, the ash content is less than 19 percent, and the ash content is shown in Table 11.
TABLE 11 coke and coke breeze ash fractions
| Composition (I) | Fe 2 O 3 | Al 2 O 3 | SiO 2 | CaO | MgO |
| ％ | 12.08 | 21.08 | 1.09 | 13.07 | 1.09 |
The method for smelting the stone coal vanadium ore by the blast furnace comprises the following steps:
(1) Mixing the stone coal navajoite, the steel making slag, the iron ore powder and the coke breeze according to the mass ratio of 100;
TABLE 12 sinter chemistry
| Composition (I) | CaO | MgO | K 2 O | BaO | SiO 2 | Al 2 O 3 | TiO 2 | V 2 O 5 | TFe |
| ％ | 23.6 | 3.08 | 0.49 | 1.0 | 36 | 1.88 | 0.70 | 1.83 | 10 |
(2) Sintering ore obtained in the step (1) and coke with the particle size of 5-50 mm are placed at 600m 3 The blast furnace with double slag holes is used for continuous smelting, the air temperature is 1100 ℃, and the air quantity is 2000m 3 At the furnace temperature of 1450 ℃, the coke ratio is 300kg/t slag, and acid slag and vanadium-containing pig iron are obtained; the acidity coefficient of the acid slag is 1.47, the daily yield of the acid slag is 2300 tons, and the annual yield is 76 ten thousand tons; the mass content of V in the vanadium-containing pig iron is 7.5 percent, the daily yield of the vanadium-containing pig iron is 300 tons, and the annual yield is 9.9 ten thousand tons; the acid slag chemistry is shown in table 13.
TABLE 13 acid slag chemistry
| Composition (A) | CaO | MgO | K 2 O | BaO | FeO | SiO 2 | Al 2 O 3 | TiO 2 | V 2 O 3 |
| ％ | 21.6 | 2.8 | 0.91 | 1.13 | 1.0 | 35 | 2.1 | 1.07 | 0.10 |
The chemical composition of the vanadium-containing pig iron is shown in Table 14.
TABLE 14 pig iron chemistry containing vanadium
| Composition (I) | TFe | V | C | Si | Mn | Ti | P | S |
| ％ | 87 | 7.5 | 4.1 | 0.5 | 0.1 | Micro-scale | 0.05 | 0.1 |
The preparation method of the rock wool prepared by the acid slag with the acidity coefficient of 1.47 prepared in the embodiment is the same as that in the embodiment 1, and the performance data of the product rock wool are as follows: 1. the rock wool has an average diameter of 6.5 microns, a rock wool product slag ball content (the particle diameter is more than 0.25 mm) of not more than 9.5 percent (mass fraction) and a density (kg/m) of 3 3 ) =145,5, thermal conductivity (average temperature 70) 0 +3 Test Density 150kg/m 3 /[W/(m.k)]=0.043,6, heat load shrinkage temperature/° c =654.
7.5V% vanadium-containing pig iron is desulfurized by an electric arc furnace and subjected to phosphorus removal and ingot storage.
From the above embodiments, it can be seen that the method for smelting stone coal vanadium ore in blast furnace provided by the invention adopts the blast furnace to smelt the stone coal vanadium ore, the existing stone coal vanadium extraction process by water method is replaced by the blast furnace fire metallurgy process, and HCl and Cl are not generated in the production process 2 Gas, toxic high-valence vanadium oxide, pentavalent vanadium ions and a large amount of waste residues are generated, the produced acid slag with the acidity coefficient of 1.2-2.0 can be used for manufacturing various high-quality energy-saving rock wool, a byproduct vanadium-containing pig iron can be used as a raw material for steel smelting, a solid product can be fully recovered, and the generated coal gas can be reused as hot air, so that the resource utilization of stone coal vanadium ore is realized; meanwhile, the industrial solid waste steelmaking slag is used as a raw material, so that the recycling of the industrial solid waste is realized, and the production cost is low.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention.
Claims (9)
1. A method for preparing rock wool and vanadium-containing pig iron by smelting stone coal vanadium ore in a blast furnace comprises the following steps:
(1) Mixing the stone coal navajoite, the steel-making slag, the iron ore powder and the coke powder, and then sintering to obtain a sintered ore;
(2) Carrying out blast furnace smelting on the sintered ore obtained in the step (1) and coke to obtain acid slag and vanadium-containing pig iron; the acidity coefficient of the acid slag is 1.2-2.0; the acid slag is directly prepared into rock wool after heat preservation and refining.
2. The process of claim 1, wherein V is in the stone coal vanadium ore in the step (1) 2 O 5 The mass content of (A) is more than 0.5%.
3. The method according to claim 1, wherein the steel-making slag in step (1) is converter slag; the converter steel slag comprises vanadium-containing steel slag and/or ordinary steel slag.
4. The method according to any one of claims 1 to 3, wherein the mass ratio of the stone coal navajoite, the steel-making slag, the iron ore powder and the coke breeze in the step (1) is (50-100): (2-50): (5-10).
5. The method according to claim 1, wherein the sintering temperature in the step (1) is 1200-1400 ℃, and the sintering time is 30-40 min.
6. The method according to claim 1, wherein the mass ratio of the total mass of the coke powder in the step (1) and the coke in the step (2) to the acid slag is 300-350 kg/t.
7. The method according to claim 1, wherein the temperature of the blast furnace during the blast furnace smelting in the step (2) is 1450 to 1550 ℃.
8. The method according to claim 1, wherein the temperature of the hot blast during the blast furnace smelting in the step (2) is 900 to 1300 ℃.
9. The method according to claim 1, 7 or 8, wherein the time for blast furnace smelting in the step (2) is 4-6 hours.
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