CN111394538A - Converter and furnace lining thereof and preparation method - Google Patents
Converter and furnace lining thereof and preparation method Download PDFInfo
- Publication number
- CN111394538A CN111394538A CN202010373954.2A CN202010373954A CN111394538A CN 111394538 A CN111394538 A CN 111394538A CN 202010373954 A CN202010373954 A CN 202010373954A CN 111394538 A CN111394538 A CN 111394538A
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- China
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- furnace
- converter
- lining
- layer
- slag
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/44—Refractory linings
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/44—Refractory linings
- C21C5/441—Equipment used for making or repairing linings
- C21C5/443—Hot fettling; Flame gunning
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a furnace lining of a converter, which comprises a heat insulation layer, a permanent layer and a working layer from outside to inside, wherein the part of the working layer, corresponding to the preset height of a furnace bottom and a furnace body, is an acid-resistant masonry layer built by acid-resistant and washing-resistant materials, the part of the working layer, corresponding to the furnace cap and above the preset height of the furnace body, is an alkaline masonry layer built by magnesium-carbon bricks, and the preset height is 1 m above a slag line. By applying the furnace lining of the converter provided by the invention, the vanadium extracting furnace lining is made of acidic refractory materials for the part below the preset height of the furnace body, so that the reaction of acid-washing substances in vanadium slag is avoided, and the corrosion speed of the furnace lining is reduced. And for the part above the preset height, because the contact time of the part with the acid-washing substance in the vanadium slag is short, the part can be built by adopting magnesia carbon bricks to form an alkaline building layer, and the long service life and the low-cost furnace age control of the converter can be realized by the design of different materials. The invention also discloses a converter with the furnace lining, and the converter also has the technical effects.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a converter and a converter lining thereof, and also relates to a preparation method of the converter lining.
Background
At present, China has a large amount of vanadium titano-magnetite resources. For example, enterprises such as Pan steel, finished steel, Kun steel and Wei steel adopt vanadium-titanium magnetite for smelting, molten iron smelted by the vanadium-titanium magnetite in a blast furnace has higher vanadium content than common molten iron, and vanadium is an important resource, so vanadium must be extracted before the molten iron is smelted to prepare vanadium slag. The vanadium extraction process of the vanadium-containing molten iron mainly adopts a method of extracting vanadium by a converter, which is a molten iron vanadium extraction process that vanadium in the vanadium-containing molten iron is oxidized into vanadium slag and separated by the converter before steel making.
Iron and steel enterprises adopting the converter to extract vanadium (or desiliconize) adopt an alkaline furnace lining to carry out steel making, and the service life of the furnace lining is generally low. During the vanadium extraction process, the oxidation of silicon, iron and phosphorus elements can lead the slag to be weakly acidic or strongly acidic, and the vanadium slag and the furnace lining brick generate neutralization reaction, so that the corrosion speed of refractory materials is accelerated, and the furnace life is reduced.
In summary, how to effectively solve the problems of short furnace life of the converter and the like is a problem to be solved by the technical personnel in the field at present.
Disclosure of Invention
In view of the above, a first object of the present invention is to provide a converter and a lining thereof, which can effectively solve the problem of short campaign of the converter, and a second object of the present invention is to provide a method for preparing a lining of a converter.
In order to achieve the first object, the invention provides the following technical scheme:
the utility model provides a furnace lining of converter, from outer to interior includes heat insulation layer, permanent layer and working layer, the working layer corresponds stove bottom and the furnace body predetermine highly with the lower part adopt acidproof building layer that acidproof washing resistant material built by laying bricks or stones, the working layer correspond the stove top with the part more than the predetermined height of furnace body is for adopting the alkaline building layer that magnesia carbon brick built by laying bricks or stones, predetermine highly for 1 meter more than the slag line.
Preferably, the lining of the converter further includes a slag splashing layer formed by splashing slag from the acidic slag splashing protection material.
Preferably, in the lining of the converter, the components of the acid-washing resistant material include quartz sand and borax.
Preferably, in the lining of the converter, SiO is contained in the acid-washing resistant material2The content of the borax is more than 95 percent, the content range of the borax is 1 to 4 percent, and the balance is caking agent and inevitable impurities.
Preferably, in the lining of the converter, the content of magnesium in the alkaline masonry layer is more than 80%.
The furnace lining of the converter provided by the invention comprises a heat insulation layer, a permanent layer and a working layer from outside to inside. Wherein, the working layer corresponds the furnace bottom and the furnace body predetermine highly with the lower part be adopt acid-resistant masonry layer that acid-resistant washing resistant material built by laying bricks or stones, the working layer corresponds the furnace cap and the furnace body predetermine highly above the part be the alkaline masonry layer that adopts the magnesia carbon brick to build by laying bricks or stones, predetermine highly for 1 meter more than the slag line.
By applying the furnace lining of the converter provided by the invention, after the vanadium extraction converter is added with iron, molten iron can only submerge the furnace bottom area, slag can rise to the furnace body area in the blowing process, and the slag in the furnace cap area only passes through the furnace during slag pouring or furnace pouring, so that the acid refractory material is used for manufacturing the vanadium extraction furnace lining for the part below the preset height of the furnace body, acid pickling substances in the vanadium slag are prevented from reacting with the vanadium extraction furnace lining, and the corrosion speed of the furnace lining is reduced. And for the part above the preset height, because the contact time of the part with the acid-washing substance in the vanadium slag is short, the part can be built by adopting magnesia carbon bricks to form an alkaline building layer, and the long service life and the low-cost furnace age control of the converter can be realized by the design of different materials.
The invention also provides a converter comprising any one of the furnace linings. Since the furnace lining has the technical effects, the converter with the furnace lining also has the corresponding technical effects.
In order to achieve the second object, the present invention provides the following technical solutions:
a method for preparing a converter lining comprises the following steps:
the furnace bottom and the furnace body are built by adopting acid-washing-resistant materials under the preset height, the furnace cap and the furnace body are built by adopting magnesia carbon bricks under the part above the preset height, and the preset height is 1 m above a slag line.
Preferably, the method for preparing a lining of a converter further includes:
and performing slag splashing protection by adopting the acidic slag splashing protection material.
Preferably, the method for preparing a lining of a converter further includes:
and (4) performing local maintenance on the furnace body by using the repairing mass and the gunning material.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for manufacturing a lining of a converter according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention discloses a converter and a furnace lining thereof, which are used for prolonging the service life of a vanadium extraction converter and reducing the repair time of the vanadium extraction converter.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In one embodiment, the present invention provides a furnace lining for a converter comprising, from outside to inside, a thermal insulation layer, a permanent layer, and a working layer.
The converter is mainly improved aiming at a working layer of the converter, namely a layer of refractory material of the converter, which is in contact with molten steel and slag. Conventional arrangements in the prior art can be used for the insulating and permanent layers. For the heat insulating layer, an asbestos plate or refractory fiber is generally adopted for masonry; for the permanent layer, a low-grade magnesia carbon brick, a tar dolomite brick or a sintered magnesia brick is mostly adopted for building, and bricks at different parts of the permanent layer can be different.
For the working layer, different from the conventional whole magnesia carbon brick masonry, different materials are adopted for different parts in the application. Because enterprises adopting vanadium-titanium magnetite for smelting are in use, in order to recover vanadium in molten iron, vanadium is oxidized into vanadium slag by adopting a converter vanadium extraction mode, the vanadium slag mainly comprises a vanadium spinel phase, a silicate phase, metallic iron and free quartz, and the vanadium slag is wholly weakly acidic or strongly acidic. The conventional vanadium extraction converter uses magnesia carbon bricks to build a furnace, acid-base neutralization reaction can be carried out on acid-base acid-washing substances in vanadium slag and MgO of refractory materials, particularly when the content of Si in molten iron is more than 0.20 percent, or the content of FeO in the vanadium slag is more than 20 percent, or the temperature of semisteel exceeds 1380 ℃, the corrosion degree of the refractory materials is increased, particularly the corrosion of a slag line part is serious, the service life of a furnace lining of the vanadium extraction converter is shortened, and the furnace age is only 3000-10000 furnaces.
Therefore, the part of the working layer corresponding to the furnace bottom and the furnace body above the preset height is an acid-resistant masonry layer built by acid-resistant washing-resistant materials, the part of the working layer corresponding to the furnace cap and the furnace body above the preset height is an alkaline masonry layer built by magnesia carbon bricks, and the preset height is 1 meter above a slag line. Namely, the areas of the furnace cap and the furnace body which are more than one meter above the slag line are built by magnesia carbon bricks; and acid-washing resistant materials are adopted to build the areas of the furnace bottom and the furnace body which are more than the slag line by one meter. The preset height is set to be more than one meter of the slag line, so that the slag line part can be built by using acid-washing resistant materials, and the corrosion resistance of the position which is easy to be corroded by acid is ensured.
By applying the furnace lining of the converter provided by the invention, after the vanadium extraction converter is added with iron, molten iron can only submerge the furnace bottom area, slag can rise to the furnace body area in the blowing process, and the slag in the furnace cap area only passes through the furnace during slag pouring or furnace pouring, so that the acid refractory material is used for manufacturing the vanadium extraction furnace lining for the part below the preset height of the furnace body, acid pickling substances in the vanadium slag are prevented from reacting with the vanadium extraction furnace lining, and the corrosion speed of the furnace lining is reduced. And for the part above the preset height, because the contact time of the part with the acid-washing substance in the vanadium slag is short, the part can be built by adopting magnesia carbon bricks to form an alkaline building layer, and the long service life and the low-cost furnace age control of the converter can be realized by the design of different materials.
Further, the slag splashing layer formed by slag splashing of the acid slag splashing furnace protection material is also included. Namely, on the basis of using acid refractory materials to manufacture the furnace lining of the vanadium extraction converter, acid slag splashing furnace protection materials are adopted to carry out slag splashing furnace protection, and meanwhile, furnace body local maintenance can be carried out by combining with using repairing materials and gunning materials. Further enhancing the acid erosion resistance of the furnace lining, prolonging the furnace life and reducing the maintenance cost.
In the above embodiments, the components of the acid-washing resistant material include quartz sand and borax. That is, quartz sand and borax are used to prepare acid-washing resistant material, the quartz sand is a hard, wear-resistant and chemically stable silicate mineral, the main mineral component of which is SiO2. The quartz sand is not dissolved in acid, so that the quartz sand has good acid resistance. The specific quartz sand may be a commercially available material, and is not particularly limited. The chemical name of borax is sodium borate, which is used as an additive and mainly plays a role in binding and the like, so that the borax is fully mixed with quartz sand to form acid-washing-resistant refractory bricks for building.
Further, SiO in the acid-washing resistant material2The content of the borax is more than 95 percent, the content range of the borax is 1 to 4 percent, and the balance is caking agent and inevitable impurities. The main component of the quartz sand is SiO2When the content is more than 95%, good material resistance can be obtained. The contents herein are all expressed by mass percentage. Preferably, the acid and wash resistant material comprises 3% of borax and 97% of quartz sand by mass percent.
In each of the above examples, the magnesium content of the alkaline masonry layer was greater than 80%. Namely, the magnesia carbon brick is adopted to manufacture the alkaline masonry layer of the furnace lining, and the Mg content is more than 80 percent.
Based on the furnace linings provided in the above embodiments, the invention also provides a converter comprising any one of the furnace linings in the above embodiments. Because the converter adopts the lining in the above embodiment, please refer to the above embodiment for the beneficial effect of the converter.
Referring to fig. 1, fig. 1 is a schematic flow chart of a method for manufacturing a converter lining according to an embodiment of the present invention. In one embodiment, the method comprises the following steps:
s1: the part above the preset height of the furnace bottom and the furnace body is built by adopting magnesia carbon bricks, and the preset height is 1 meter above a slag line.
The lining refractory of the vanadium extraction converter is divided into three parts, namely a furnace bottom, a furnace body and a furnace cap, after the vanadium extraction converter is charged with iron, molten iron can only submerge the region of the furnace bottom, slag can rise to the region of the furnace body in the blowing process, and the slag in the region of the furnace cap only flows over the slag or flows over the furnace, so that the regions of the furnace bottom and the furnace body of the vanadium extraction converter with the slag line of less than 1 meter are built by acid-washing refractory, and the upper part of the furnace body and the furnace cap are built by alkaline magnesia carbon bricks.
By applying the preparation method of the converter lining provided by the invention, the vanadium extraction lining is made of the acidic refractory material for the part below the preset height of the furnace body, so that the acid pickling substances in the vanadium slag are prevented from reacting with the vanadium extraction lining, and the erosion speed of the lining is reduced. And for the part above the preset height, because the contact time of the part with the acid-washing substance in the vanadium slag is short, the part can be built by adopting magnesia carbon bricks to form an alkaline building layer, and the long service life and the low-cost furnace age control of the converter can be realized by the design of different materials.
Further, the preparation method of the converter lining further comprises the following steps:
s2: and performing slag splashing protection by adopting the acidic slag splashing protection material.
Furthermore, the preparation method of the converter lining further comprises the following steps:
s3: and (4) performing local maintenance on the furnace body by using the repairing mass and the gunning material.
I.e. local maintenance may be performed after use, depending on the erosion of the lining.
In summary, the converter and the furnace lining thereof provided by the invention use the acid refractory material to manufacture the vanadium extracting furnace lining, and can adopt the acid slag splashing furnace protection material to perform slag splashing furnace protection, and use the repairing material and the gunning material to perform local maintenance of the furnace body. The furnace life control with long service life and low cost is realized.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The utility model provides a furnace lining of converter, its characterized in that, from outer to interior includes heat insulation layer, permanent layer and working layer, the working layer corresponds stove bottom and the body of a furnace highly predetermine with the lower part adopt acidproof masonry layer that acidproof washing resistant material built by laying bricks or stones, the working layer correspond the stove cap with the part more than the predetermined height of the body of a furnace is the alkaline masonry layer that adopts magnesium carbon brick to build by laying bricks or stones, predetermine highly for 1 meter more than the slag line.
2. The lining of a converter according to claim 1, further comprising a slag layer formed by slag splashes from the acidic slag splashed lining.
3. The lining of a converter according to claim 1 or 2, wherein the component of the acid-washing resistant material includes quartz sand and borax.
4. The lining for a converter according to claim 3, wherein SiO is contained in the acid-washing resistant material2The content of the borax is more than 95 percent, the content range of the borax is 1 to 4 percent, and the balance is caking agent and inevitable impurities.
5. A lining for a converter according to claim 1, wherein the basic masonry has a magnesium content of greater than 80%.
6. A converter comprising a metal furnace shell and a lining located within said metal furnace shell, characterized in that said lining is according to any one of claims 1 to 5.
7. A method for preparing a converter lining is characterized by comprising the following steps:
the furnace bottom and the furnace body are built by adopting acid-washing-resistant materials under the preset height, the furnace cap and the furnace body are built by adopting magnesia carbon bricks under the part above the preset height, and the preset height is 1 m above a slag line.
8. The method for producing a converter lining according to claim 7, further comprising:
and performing slag splashing protection by adopting the acidic slag splashing protection material.
9. The method for producing a converter lining according to claim 7, further comprising:
and (4) performing local maintenance on the furnace body by using the repairing mass and the gunning material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010373954.2A CN111394538A (en) | 2020-05-06 | 2020-05-06 | Converter and furnace lining thereof and preparation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010373954.2A CN111394538A (en) | 2020-05-06 | 2020-05-06 | Converter and furnace lining thereof and preparation method |
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| CN111394538A true CN111394538A (en) | 2020-07-10 |
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| CN202010373954.2A Pending CN111394538A (en) | 2020-05-06 | 2020-05-06 | Converter and furnace lining thereof and preparation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112680559A (en) * | 2020-11-30 | 2021-04-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Step bottom blowing CO for converter2Method for extracting vanadium |
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2020
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| CN103819205A (en) * | 2013-11-25 | 2014-05-28 | 江苏大学 | Quick fettling material of induction furnace and fettling method |
| CN104557093A (en) * | 2015-01-16 | 2015-04-29 | 魏书林 | Novel refractory material and production method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112680559A (en) * | 2020-11-30 | 2021-04-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Step bottom blowing CO for converter2Method for extracting vanadium |
| CN112680559B (en) * | 2020-11-30 | 2022-08-05 | 攀钢集团攀枝花钢铁研究院有限公司 | Step bottom blowing CO for converter 2 Method for extracting vanadium |
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Application publication date: 20200710 |