CN110257579B - Process for smelting schreyerite by using Ou smelting furnace - Google Patents
Process for smelting schreyerite by using Ou smelting furnace Download PDFInfo
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- CN110257579B CN110257579B CN201910538249.0A CN201910538249A CN110257579B CN 110257579 B CN110257579 B CN 110257579B CN 201910538249 A CN201910538249 A CN 201910538249A CN 110257579 B CN110257579 B CN 110257579B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0046—Making spongy iron or liquid steel, by direct processes making metallised agglomerates or iron oxide
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/006—Starting from ores containing non ferrous metallic oxides
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
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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
- C22B1/16—Sintering; Agglomerating
- C22B1/214—Sintering; Agglomerating in shaft furnaces
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Abstract
The invention discloses a process for smelting schreyerite by using an Ou metallurgical furnace, which comprises the following specific steps: 1. the vanadium-titanium fine powder is used as a raw material and is sintered into vanadium-titanium pellets or vanadium-titanium sinter, the binary alkalinity of the vanadium-titanium sinter is improved to 2.4 times, the content of magnesium oxide is improved to more than 2 percent, a low-strength interval of the vanadium-titanium sinter is avoided, the powder is reduced, and limestone is not added in a blast furnace ingredient; 2. sintering vanadium and titanium and reducing vanadium and titanium pellets in an Ou smelting shaft furnace to obtain sponge iron with the metallization rate of more than 65 percent, entering a gasification furnace, and finishing final reduction and soft melting of the sponge iron material in the gasification furnace by using coal injection, foam coal and coke to form qualified molten iron; 3. adopting high coal ratio: the coal ratio is 700kg/t, the low coke ratio is 150kg/t, and low silicon smelting is carried out.
Description
Technical Field
The invention relates to a process for smelting schreyerite by using an Ou metallurgical furnace.
Background
The vanadium titano-magnetite is magnetic iron ore with symbiosis of iron, vanadium and titanium, and has a large storage amount in Panzhihua area, Chengde, Xinjiang and the like in the southwest of China, but the vanadium titano-magnetite smelting technology is a worldwide problem for a long time. The main problems are the following aspects:
1. in the aspect of raw materials, the strength of the vanadium-titanium sinter is generally lower than that of the common sinter, the drum index of the vanadium-titanium sinter is generally 81-82%, and the drum index of the common sinter can reach 83-85%. The drum index of the vanadium-titanium sinter after cooling is improved by 6-7% compared with that before cooling, which shows that the vanadium-titanium sinter has large brittleness in a hot state and strength inferior to that of a common sinter. Meanwhile, the low-temperature reduction degradation rate of the vanadium-titanium sinter is much higher than that of the common sinter, generally more than 60 percent and as high as 80-85 percent.
2. The slag is characterized in that the main component of the blast furnace smelting slag is derived from gangue component brought by raw fuel. Smelting common ore to form a quaternary (CaO-MgO-SiO2-Al2O3) slag system; the vanadium-titanium ore is smelted into a five-element (CaO-MgO-SiO2-Al2O3-TiO2) slag system. Compared with the quaternary slag system slag, the quinary slag system slag has the biggest characteristics of high slag melting temperature, foam slag formation, slag thickening and low slag S removal capacity, wherein the melting temperature of the low-titanium slag is similar to that of the ordinary quaternary slag system, and the foam slag formation is obvious in the smelting of the high-titanium slag. The thickening of the slag is realized by that a part of TiO2 in the slag is reduced to generate carbon and nitrogen compounds of titanium along with the reduction process in the blast furnace. The melting point of TiC is 3140 + -90 deg.C, the melting point of TiN is 2950 + -50 deg.C, and is far higher than the highest temperature in the furnace. And the desulfurization capacity of the high titanium slag is far lower than that of common blast furnace slag, and Ls is only 5-9.
3. In the aspect of molten iron, the melting point of a sticky tank material of vanadium-titanium molten iron is very high and higher than the tapping temperature due to the fact that the sticky tank material contains oxides of vanadium and titanium, the sticky tank material cannot be melted in the next tapping process, the sticky tank material is thicker when the sticky tank material is bonded, the volume of a molten iron tank is rapidly reduced, the molten iron tank can be used for dozens of times, the normal use and turnover of the molten iron tank are seriously affected, and difficulty is brought to the planning arrangement of normal tapping.
According to the traditional blast furnace smelting vanadium-titanium magnetite, along with the improvement of the using proportion of the vanadium-titanium ore, the contents of [ V ], [ Ti ], [ Si ], [ S ], [ C ] and the like in the molten iron are more difficult to control. TiC, TiN and VC with high melting point are easy to generate, the viscosity of molten iron slag is increased, the separation effect of the molten iron slag is reduced, the fluidity of the molten iron is reduced, and the molten iron is stuck to a tank, so that the method is a difficult point in the existing vanadium-titanium ore smelting process.
Disclosure of Invention
The invention aims to provide a process for smelting schreyerite by using an Ou metallurgical furnace, which can effectively avoid the formation of a refractory substance TiN in the schreyerite smelting process.
The invention aims to realize the process for smelting schreyerite by using an Ou metallurgical furnace, which comprises the following specific steps:
1. the vanadium-titanium fine powder is used as a raw material and is sintered into vanadium-titanium pellets or vanadium-titanium sinter, the binary alkalinity of the vanadium-titanium sinter is improved to 2.4 times, the content of magnesium oxide is improved to more than 2 percent, a low-strength interval of the vanadium-titanium sinter is avoided, the powder is reduced, and limestone is not added in a blast furnace ingredient;
2. sintering vanadium and titanium and reducing vanadium and titanium pellets in an Ou smelting shaft furnace to obtain sponge iron with the metallization rate of more than 65 percent, entering a gasification furnace, and finishing final reduction and soft melting of the sponge iron material in the gasification furnace by using coal injection, foam coal and coke to form qualified molten iron;
3. adopting high coal ratio: the coal ratio is 700kg/t, the low coke ratio is 150kg/t, and low silicon smelting is carried out.
The smelting of the vanadium titano-magnetite is carried out by using the Ou smelting furnace process, and the technical bottleneck of the blast furnace vanadium titano-magnetite smelting process can be effectively solved. Solves the problems of difficult slag iron production and poor technical and economic indexes. Is a new process for smelting vanadium-titanium magnetite ore with high efficiency and economy.
Detailed Description
A process for smelting schreyerite by using an Ou smelting furnace comprises the following specific steps:
1. the vanadium-titanium fine powder is used as a raw material and is sintered into vanadium-titanium pellets or vanadium-titanium sinter, the binary alkalinity of the vanadium-titanium sinter is improved to 2.4 times, the content of magnesium oxide is improved to more than 2 percent, a low-strength interval of the vanadium-titanium sinter is avoided, the powder is reduced, and limestone is not added in a blast furnace ingredient;
2. sintering vanadium and titanium and reducing vanadium and titanium pellets in an Ou smelting shaft furnace to obtain sponge iron with the metallization rate of more than 65 percent, entering a gasification furnace, and finishing final reduction and soft melting of the sponge iron material in the gasification furnace by using coal injection, foam coal and coke to form qualified molten iron;
3. adopting high coal ratio: the coal ratio is 700kg/t, the low coke ratio is 150kg/t, and low silicon smelting is carried out.
In the smelting process of vanadium-titanium ore, a layer of compact-structure sediment is arranged on brick linings of a hearth and a furnace bottom, and the sediment is a multiphase substance containing a large amount of high-melting-point low-price titanium compounds, metallic iron in a special form and other slag phase minerals. Because of its high melting point, the final melting temperature is above 1500 deg.C, and it can not be melted in this region, so that it can protect the brick lining of hearth and bottom of furnace, and can effectively solve the technical problem of long service life of refractory material of hearth in smelting process of Europe and metallurgy furnace.
Claims (1)
1. A process for smelting schreyerite by using an Ou smelting furnace is characterized by comprising the following steps: the method comprises the following steps:
1) the vanadium-titanium fine powder is used as a raw material and is sintered into vanadium-titanium pellets or vanadium-titanium sinter, the binary alkalinity of the vanadium-titanium sinter is improved to 2.4 times, the content of magnesium oxide is improved to more than 2 percent, a low-strength interval of the vanadium-titanium sinter is avoided, the powder is reduced, and limestone is not added in a blast furnace ingredient;
2) sintering vanadium and titanium and reducing vanadium and titanium pellets in an Ou smelting shaft furnace to obtain sponge iron with the metallization rate of more than 65 percent, entering a gasification furnace, and finishing final reduction and soft melting of the sponge iron material in the gasification furnace by using coal injection, foam coal and coke to form qualified molten iron;
3) adopting high coal ratio: the coal ratio is 700kg/t, the low coke ratio is 150kg/t, and low silicon smelting is carried out.
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| CN201910538249.0A CN110257579B (en) | 2019-06-20 | 2019-06-20 | Process for smelting schreyerite by using Ou smelting furnace |
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| CN201910538249.0A CN110257579B (en) | 2019-06-20 | 2019-06-20 | Process for smelting schreyerite by using Ou smelting furnace |
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| CN110257579B true CN110257579B (en) | 2020-12-25 |
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| CN111748667B (en) * | 2020-07-07 | 2021-08-20 | 新疆八一钢铁股份有限公司 | Iron-smelting method for reducing fuel ratio of Europe smelting furnace |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104087698A (en) * | 2014-06-30 | 2014-10-08 | 攀枝花学院 | Pig iron carburization technique by coal-base direct reduction |
| CN107868872A (en) * | 2017-11-30 | 2018-04-03 | 攀枝花学院 | The method that vanadium chromium reducing slag two step method reduction melting prepares vanadium ferrochrome |
| CN109652643A (en) * | 2019-01-30 | 2019-04-19 | 中南大学 | High quality sinter and preparation method thereof for COREX ironmaking technique of fusion and reduction |
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| US8057734B2 (en) * | 2009-02-24 | 2011-11-15 | Praxair Technology, Inc. | Producing metal and carbon dioxide with hydrogen recycle |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104087698A (en) * | 2014-06-30 | 2014-10-08 | 攀枝花学院 | Pig iron carburization technique by coal-base direct reduction |
| CN107868872A (en) * | 2017-11-30 | 2018-04-03 | 攀枝花学院 | The method that vanadium chromium reducing slag two step method reduction melting prepares vanadium ferrochrome |
| CN109652643A (en) * | 2019-01-30 | 2019-04-19 | 中南大学 | High quality sinter and preparation method thereof for COREX ironmaking technique of fusion and reduction |
Non-Patent Citations (2)
| Title |
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| "我国熔融还原炼铁技术发展现状及生产实践";贾利军 等;《2019年全国炼铁设备及设计年会》;20190424;第63-67页 * |
| "攀枝花钒钛磁铁矿非高炉冶炼技术评价";邹建新;《轻金属》;20111231(第5期);第51-54页 * |
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