CN110280727B - Heat preservation method for smelting FeV80 in large-scale tilting furnace - Google Patents
Heat preservation method for smelting FeV80 in large-scale tilting furnace Download PDFInfo
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- CN110280727B CN110280727B CN201910716220.7A CN201910716220A CN110280727B CN 110280727 B CN110280727 B CN 110280727B CN 201910716220 A CN201910716220 A CN 201910716220A CN 110280727 B CN110280727 B CN 110280727B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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Abstract
The invention belongs to the technical field of ferrovanadium smelting, and particularly discloses a heat preservation method for smelting FeV80 in a large-scale tilting furnace, which can improve the quality and efficiency of smelting FeV 80. The heat preservation method for smelting the FeV80 by the large-scale tilting furnace comprises the steps of casting smelted FeV80 molten iron into a knotted and formed ingot mold, covering a heat preservation cover plate on the ingot mold, preserving heat for 8-20 hours, removing the heat preservation cover plate after heat preservation is finished, detaching the ingot mold for natural cooling after 8-20 hours, separating slag and iron after natural cooling for 8-20 hours to obtain a vanadium iron cake, naturally cooling the vanadium iron cake for 1-6 hours, then performing water quenching, and crushing the vanadium iron cake after water quenching is performed to 20-150 ℃. According to the heat preservation method for smelting the FeV80 by the large-scale tilting furnace, the FeV80 is preserved by covering the heat preservation cover plate, the heat preservation time, the furnace dismantling time, the natural cooling time and the degree of the water-quenched vanadium iron cake are effectively controlled, the crystallization of the FeV80 can be effectively improved, the hardness of the FeV80 is reduced, and the fragmentity of the FeV80 is improved, so that the production efficiency of the FeV80 is greatly improved.
Description
Technical Field
The invention belongs to the technical field of ferrovanadium smelting, and particularly relates to a heat preservation method for smelting FeV80 in a large-scale tilting furnace.
Background
At present, when ferrovanadium with the grade of FeV80 is smelted by using a large-scale tilting furnace with the cake weight more than or equal to 7 t/furnace, because the cake weight of a single FeV80 furnace is larger, the ferrovanadium cake after tapping cooling water quenching has higher hardness, the crushing performance is poorer, and the production efficiency is extremely low. In order to reduce the hardness of the ferrovanadium cake and improve the production efficiency, heat preservation is needed after FeV80 is smelted and tapped. At present, the ingot mould after tapping is treated in a natural heat preservation mode, and the heat preservation effect is poor, so that FeV80 has the disadvantages of fine crystallization, high hardness, poor crushing performance and low production efficiency.
Disclosure of Invention
The invention aims to provide a heat preservation method for smelting FeV80 by a large-scale tilting furnace, which can improve the quality and efficiency of smelting FeV 80.
The technical scheme adopted by the invention for solving the technical problems is as follows: casting smelted FeV80 molten iron into a knotted and formed ingot mold, covering a heat-preservation cover plate on the ingot mold, preserving heat for 8-20 hours, removing the heat-preservation cover plate after heat preservation is finished, disassembling the ingot mold for natural cooling after 8-20 hours, performing slag-iron separation after natural cooling for 8-20 hours to obtain a vanadium iron cake, naturally cooling the vanadium iron cake for 1-6 hours, performing water quenching, and crushing the vanadium iron cake after water quenching is performed to 20-150 ℃;
the ingot mold is knotted by adopting the following method:
1) knotting the bottom and the inner side wall of the ingot mold for at least three times by adopting a knotting material to form a refractory layer;
2) after the fire-resistant layer is knotted, arranging an anti-seepage leveling layer on the surface of the fire-resistant layer corresponding to the molten iron area on the bottom and the inner side wall of the ingot mold; the thickness of the anti-seepage leveling layer is 1-2 mm;
3) after the arrangement of the seepage-proofing leveling layer is finished, baking the ingot mould by adopting gas; firstly, baking for 3-8 hours by using medium fire, and then baking for 10-18 hours by using big fire, wherein the total baking time is more than 14 hours, so as to obtain a formed ingot mold; the flow rate of the medium fire coal gas is 100-150 Nm3The flow rate of the coal gas generating the big fire is 200-300 Nm3/h。
Furthermore, the heat-insulating cover plate is filled with heat-insulating materials.
Further, the thickness of the heat insulation material is 200-400 mm.
Further, the heat insulation material is an aluminosilicate fiber material.
The invention has the beneficial effects that: according to the heat preservation method for smelting the FeV80 by the large-scale tilting furnace, the FeV80 is preserved by covering the heat preservation cover plate, the heat preservation time, the furnace dismantling time, the natural cooling time and the degree of the water-quenched vanadium iron cake are effectively controlled, the crystallization of the FeV80 can be effectively improved, the hardness of the FeV80 is reduced, and the fragmentity of the FeV80 is improved, so that the production efficiency of the FeV80 is greatly improved.
Detailed Description
The present invention will be further described with reference to the following examples.
A heat preservation method for smelting FeV80 in a large tilting furnace comprises the steps of pouring smelted FeV80 molten iron into a knotted and formed ingot mold, covering a heat preservation cover plate on the ingot mold, preserving heat for 8-20 hours, removing the heat preservation cover plate after heat preservation is finished, disassembling the ingot mold for natural cooling after 8-20 hours, separating slag from iron after natural cooling for 8-20 hours to obtain a vanadium iron cake, naturally cooling the vanadium iron cake for 1-6 hours, then performing water quenching, and crushing the vanadium iron cake after water quenching is performed to 20-150 ℃.
Among them, there are various methods for knotting the ingot mold, and preferably, the following method is used for knotting:
1) knotting the bottom and the inner side wall of the ingot mold for at least three times by adopting a knotting material to form a refractory layer; in the step, a pneumatic pick or an electric impact tamper is generally adopted for knotting; the ramming material is preferably magnesia;
2) after the fire-resistant layer is knotted, arranging an anti-seepage leveling layer on the surface of the fire-resistant layer corresponding to the molten iron area on the bottom and the inner side wall of the ingot mold; the impermeable leveling layer is generally arranged in a spraying, brushing and other modes; the thickness of the anti-seepage leveling layer is preferably 1-2 mm; the impermeable leveling layer is generally made of a refractory material with a small particle size, preferably magnesium fire clay; the magnesium fire clay is mixed powder formed by matching refractory clay and magnesia;
3) after the arrangement of the seepage-proofing leveling layer is finished, baking the ingot mould by adopting gas; firstly, baking for 3-8 hours by using medium fire, and then baking for 10-18 hours by using big fire, wherein the total baking time is more than 14 hours, so as to obtain a formed ingot mold; the flow rate of the medium fire coal gas is 100-150 Nm3The flow rate of the coal gas generating the big fire is 200-300 Nm3/h。
The ingot mould formed by the knotting method is cooled by FeV80, the obtained ferrovanadium has complete and smooth appearance, better improved apparent quality, less slag inclusion, slag inclusion rate reduced by more than 30%, alloying layer thickness reduced by more than 3mm, and production efficiency improved by more than 20%.
The heat-preservation cover plate is mainly used for covering the ingot mould and naturally sealing the ingot mould so as to preserve the heat of the FeV80 molten iron filled in the ingot mould; the heat-insulating cover plate has a heat-insulating function, is generally made of a material with a small heat conduction coefficient, and can also be a structure of filling a heat-insulating material in a shell of the heat-insulating cover plate; the heat insulation material is preferably an aluminosilicate fiber material, and the filling thickness of the heat insulation material is preferably 200-400 mm; the size of the heat preservation cover plate is determined according to the size of the ingot mold, and the heat preservation cover plate is preferably a circular cover plate with the diameter of 2.0-2.5 m.
Example 1
After the large tilting furnace finishes smelting FeV80, casting the smelted FeV80 molten iron into a knotted and formed ingot mold, wherein the diameter of the ingot mold is 2000mm, the depth of the ingot mold is 2000mm, the ingot mold comprises a heat-preservation cover plate with the diameter equivalent to that of the ingot mold, and the heat-preservation cover plate is directly covered on the ingot mold filled with the molten iron for heat preservation for 8 hours after tapping each time; and (3) after the heat preservation is finished, removing the heat preservation cover plate, naturally cooling after 10 hours, separating slag and iron after naturally cooling for 20 hours to obtain a ferrovanadium cake, naturally cooling the ferrovanadium cake for 2 hours, then performing water quenching, and crushing the ferrovanadium cake after water quenching cooling to 50 ℃. By detection, the method is adopted for heat preservation, the FeV80 crystal with the cake weight of 7t is better improved, the hardness is reduced by 10Hb, the fragmenting property is better, the crushing time is less than or equal to 2 hours, and the production efficiency is improved by 50%.
Example 2
After the large tilting furnace finishes smelting FeV80, casting the smelted FeV80 molten iron into a knotted and formed ingot mold, wherein the diameter of the ingot mold is 2000mm, the depth of the ingot mold is 2000mm, the ingot mold comprises a heat-preservation cover plate with the diameter equivalent to that of the ingot mold, and the heat-preservation cover plate is directly covered on the ingot mold filled with the molten iron for heat preservation for 10 hours after tapping each time; and (3) after the heat preservation is finished, removing the heat preservation cover plate, after 20 hours, dismantling the furnace for natural cooling, after 14 hours of natural cooling, separating slag and iron to obtain a ferrovanadium cake, naturally cooling the ferrovanadium cake for 3 hours, then performing water quenching, and crushing the ferrovanadium cake after the water quenching is carried out to 100 ℃. By detection, the method is adopted for heat preservation, the FeV80 crystal with the cake weight of 8t is better improved, the hardness is reduced by 12Hb, the fragmenting property is better, the crushing time is less than or equal to 2 hours, and the production efficiency is improved by 55%.
Claims (4)
1. The heat preservation method for smelting FeV80 in the large-scale tilting furnace is characterized by comprising the following steps: casting the smelted FeV80 molten iron into a knotted and formed ingot mold, covering a heat-insulating cover plate on the ingot mold, preserving heat for 8-20 hours, removing the heat-insulating cover plate after heat preservation is finished, removing the furnace for natural cooling after 8-20 hours, separating slag and iron after natural cooling for 8-20 hours to obtain a ferrovanadium cake, naturally cooling the ferrovanadium cake for 1-6 hours, quenching with water, and crushing after the ferrovanadium cake is quenched with water and cooled to 20-150 ℃;
the ingot mold is knotted by adopting the following method:
1) knotting the bottom and the inner side wall of the ingot mold for at least three times by adopting a knotting material to form a refractory layer;
2) after the fire-resistant layer is knotted, arranging an anti-seepage leveling layer on the surface of the fire-resistant layer corresponding to the molten iron area on the bottom and the inner side wall of the ingot mold; the thickness of the anti-seepage leveling layer is 1-2 mm;
3) after the arrangement of the seepage-proofing leveling layer is finished, baking the ingot mould by adopting gas; firstly, baking for 3-8 hours by using medium fire, and then baking for 10-18 hours by using big fire, wherein the total baking time is more than 14 hours, so as to obtain a formed ingot mold; the flow rate of the medium fire coal gas is 100-150 Nm3The flow rate of the coal gas generating the big fire is 200-300 Nm3/h。
2. The heat preservation method for smelting FeV80 in the large-scale tilting furnace as claimed in claim 1, wherein the heat preservation method comprises the following steps: and the heat insulation cover plate is filled with a heat insulation material.
3. The heat preservation method for smelting FeV80 in the large-scale tilting furnace as claimed in claim 2, wherein the heat preservation method comprises the following steps: the thickness of the heat insulation material is 200-400 mm.
4. The heat preservation method for smelting FeV80 in the large-scale tilting furnace as claimed in claim 2 or 3, wherein the heat preservation method comprises the following steps: the heat-insulating material is an aluminosilicate fiber material.
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| CN110280727B true CN110280727B (en) | 2021-08-20 |
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| CN111197141B (en) * | 2020-02-21 | 2021-01-26 | 攀钢集团攀枝花钢铁研究院有限公司 | Control method for fine powder rate of FeV50 alloy |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103757171A (en) * | 2014-01-15 | 2014-04-30 | 攀钢集团西昌钢钒有限公司 | High vanadium ferroalloy smelting method and ingot mould for smelting high vanadium ferroalloy |
| CN203956035U (en) * | 2014-07-24 | 2014-11-26 | 攀钢集团西昌钢钒有限公司 | The ingot mould of cast vanadium iron |
| CN105903915A (en) * | 2016-05-16 | 2016-08-31 | 攀钢集团攀枝花钢铁研究院有限公司 | Knotting method of casting ingot mold in preparation process of vanadium-iron alloy |
| RU2605729C2 (en) * | 2015-05-12 | 2016-12-27 | Открытое акционерное общество "ЕВРАЗ Ванадий Тула" | Mould for reception of slag and metal |
| CN108080589A (en) * | 2017-12-14 | 2018-05-29 | 攀枝花市仁通钒业有限公司 | For the knotting method of vanadium iron ingot mould structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101693932B (en) * | 2009-10-19 | 2011-06-29 | 攀钢集团攀枝花钢钒有限公司 | Method for producing ferrovanadium |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103757171A (en) * | 2014-01-15 | 2014-04-30 | 攀钢集团西昌钢钒有限公司 | High vanadium ferroalloy smelting method and ingot mould for smelting high vanadium ferroalloy |
| CN203956035U (en) * | 2014-07-24 | 2014-11-26 | 攀钢集团西昌钢钒有限公司 | The ingot mould of cast vanadium iron |
| RU2605729C2 (en) * | 2015-05-12 | 2016-12-27 | Открытое акционерное общество "ЕВРАЗ Ванадий Тула" | Mould for reception of slag and metal |
| CN105903915A (en) * | 2016-05-16 | 2016-08-31 | 攀钢集团攀枝花钢铁研究院有限公司 | Knotting method of casting ingot mold in preparation process of vanadium-iron alloy |
| CN108080589A (en) * | 2017-12-14 | 2018-05-29 | 攀枝花市仁通钒业有限公司 | For the knotting method of vanadium iron ingot mould structure |
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