CN104694702B - The additive of vanadium extraction chromium splashing slag in converter - Google Patents
The additive of vanadium extraction chromium splashing slag in converter Download PDFInfo
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- CN104694702B CN104694702B CN201510114193.8A CN201510114193A CN104694702B CN 104694702 B CN104694702 B CN 104694702B CN 201510114193 A CN201510114193 A CN 201510114193A CN 104694702 B CN104694702 B CN 104694702B
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Abstract
The present invention relates to the additive of vanadium extraction chromium splashing slag in converter, belong to field of iron and steel smelting.Present invention solves the technical problem that the additive being to provide vanadium extraction chromium splashing slag in converter.The additive of the present invention, is made up of the component of following weight portion: the SiO of 30～75 weight portions2, the MgO of 20～70 weight portions and the H less than 3 weight portions2O.Compared with prior art, the present invention has that production technology is simple, modify the advantages such as effective.The additive of high-quality can not only be provided for vanadium extraction chromium converter, and can effectively reduce the fusing point of vanadium chromium slag, improve the vanadium chromium slag mobility after modification and adhesiveness, use vanadium chromium slag can improve dross effect when carrying out slag splashing after using, improve furnace lining erosion resistibility, be effectively improved the vanadium extraction chromium converter lining life-span.
Description
Technical field
The present invention relates to the additive of vanadium extraction chromium splashing slag in converter, belong to field of iron and steel smelting.
Background technology
Converter is the main equipment that iron and steel enterprise produces, and its life-span is directly connected to the production cost of converter.In order to improve
Life of converter, the mid-90 in 20th century, first LTV company of the U.S. develops and uses Technology of Slag Splashingfor Furnace Maintenance, is greatly improved and turns
Stove furnace life, 6200 heats of nineteen ninety rise to 15658 heats of nineteen ninety-five.After using Technology of Slag Splashingfor Furnace Maintenance, converter is fire-resistant
The consumption of material reduces by 25%～about 50%.Japan's converter lining life is the highest, typically at 6000～8000 stoves.At slag splashing
Under the conditions of, Wuhan Iron and Steel Plant passes through converter long service life systematic study, and the highest furnace life reaches more than 30,000 stoves, multiple blown converter the highest more than 10,000 stoves in age of Baosteel,
General at 6000～8000 stoves.
Protecting method with splash slag is divided into horizontal spray gun method, horizontal bottom blowing method, marksmanship of the vertical end, horizontal flame spraying, upright
Spray gun method etc..At present, commonly used is vertical oxygen marksmanship.Its process characteristic is: utilize top blow oxygen lance to switch nitrogen, splash warp
Modified finishing slag, is coated on converter lining inwall.By the change of spray angle, can on purpose concentrate certain portion of splash
Position.Before blowing, add dolomite and the Calx of people's excess, during blowing, alleviate invading of furnace lining mutually because of oversaturated magnesium oxide slag
Erosion.Additionally, foamed slag forms protective layer on furnace lining.Improve and spatter the bond strength of the two between slag blanket and backup lining brick, be to improve to spatter
The key of slag furnace retaining effect.
At present, the production method producing vanadium slag both at home and abroad is more, mainly has New Zealand's ladle to blow vanadium technique, South Africa shaking ladle
Process for extracting vanadium, Russian and Chinese vanadium extraction by converter blowing technique etc., other process for extracting vanadium also includes v-bearing steel slag vanadium extraction, extracting vanadium from stone coal
Technique etc..The production process system of vanadium extraction by converter blowing is constantly changing of addition coolant+process temperature+duration of blast both at home and abroad
Enter.Vanadium extraction from hot metal is a selective oxidation technology.Converter supply vanadium extraction is an exothermic process, [Si], [Mn], [V], [C]
Making molten bath be rapidly heated Deng element oxide, and [Si], [Mn] oxidation generation are before [V] aoxidizes, vanadium extraction can not suppress it anti-
Should, and [C], [V] conversion temperature are about at about 1385 DEG C, therefore to obtain high oxidation rate and [V] yield of [V], it is necessary to add
Enter vanadium-raising cooling agent, control bath temperature and be allowed to approach [C], [V] conversion temperature, reach vanadium extraction and protect the purpose of carbon, [V] is down to
Less than 0.05%.The terminal half steel temperature of vanadium extraction is unsuitable too high, and vanadium extracting process early stage is oxidized to main with vanadium, and the later stage is reduced to vanadium
Main, but blowing vanadium process is that vanadium is reduced to master.Molten iron temperature is made to drop to suitably so use addition coolant when cooling
Scope, by duration of blast and the control of process temperature in converter smelting, aoxidizes the vanadium in half steel, improves recovery rate.
Converter extracting vanadium produces particularity due to it, and it is safeguarded and long service life technical research is less, and converter extracting vanadium is owing to smelting
Time is short, temperature is low, eutectic composition is few, slag fluidity is poor in slag, and before arriving smelting endpoint, in molten iron, C with O is anti-
Should not be sufficiently spread out, PCO, PCO in furnace gas2Relatively low, and PO2Higher, slag bad adhesion, cause magnesia carbon brick to be exposed to oxygen
During atmosphere is enclosed, promote C and O2Reaction, ferrum liquid level above lining wear speed is apparently higher than below ferrum liquid level.The above stove of ferrum liquid level
The mode repeated action that lining is substantially peeled off by the direct decarburization of oxygen → loose embrittlement → erosion → reoxidized, makes brick body gradually
Deteriorated.For improving product vanadium rate as far as possible, extraction smelting of vanadium is stricter to Control for Kiln Temperature, it will usually uses and adds part pig
Mode carrys out auxiliary temperature-reducing.So, charging side is not only impacted by molten iron, also to be impacted by pig, owing to furnace temperature is low, and stove
Slag is bulk, operational layer brick carries out during blowing together with molten iron omnidistance rigid mechanical shock, therefore mechanical shock is converter extracting vanadium
Furnace bottom and the main cause of restoration of lower stack damage.
China is vanadium titano-magnetite big country, and the red lattice vanadium titano-magnetite of Panzhihua Region is the chromium ore resource that China is maximum,
Reserves 3,600,000,000 tons, containing Cr2O3Up to 18,000,000 tons, be the nearly twice of other areas, whole nation proved reserves.Chromium type high red lattice vanadium
Titanomagnetite be not only climb big mining area, Xisi, be also the vanadic titanomagnetite deposit of domestic current maximum.Storage of mineral deposits is in sea
The huge stratiform of western early origin is divided in different Granitic Complex like stratiform neutral and alkali mafic Ultrabasic, and magmatic differentiation is good,
Belong to late magmatic crystallization-differentiation deposit.Ore body forms big-and-middle-sized mining area, relatively independent 8, withered mining area, its Road rock mass thickness
Greatly, all kinds of ledges are complete, and ore body scale is big, and research degree is the highest, and this district is the most alleged " Hongge Deposit district ", are divided into again " mining area, south "
" mining area, north ".Different from the resource such as the mining heritages of periphery, ore deposit, Baima, Hongge Deposit is in addition to rich in metals such as ferrum, vanadium, titaniums, also
The altogether metal such as association chromium, nickel, cobalt, is China's super-huge multielement mineral intergrowth few in number, has the highest comprehensive utilization valency
Value.As a example by the chromium element of association, red Ge Nan mining area Cr2O3Grade reaches 0.34%, and chromium resource reserves are the most considerable.China is generation
The big rustless steel manufacturing country in boundary first, domestic chrome ore can not meet far away consumption demand, the most all need to be high-grade from external import
Chromite and ferrochrome.The chromium of China is metallurgical and chromic salts industry has the highest dependency degree to external chromite.Therefore, for
For the country of China's such a chromium resource shortage, it is achieved in high-chromic vanadium-titanium ferroferrite, the scale of chromium resource is reclaimed and had
Highly important economic worth and strategic importance.And the recycling of vanadium chromium resource aoxidizes back mainly by converter in molten iron
Receive, its Lining Erosion Mechanism is close with converter extracting vanadium, although vanadium slag slag splashing has had been reported that and used, but vanadium chromium slag and
The most still there is a great difference in vanadium slag, owing to there being the existence of Cr2O3, vanadium chromium slag slag state is more dry, poor fluidity, fusing point
High, it is impossible to directly to carry out slag splashing, the vanadium slag slag splashing additive agent protecting method with splash slag simultaneously reported all cannot be used
In vanadium chromium slag slag splashing, it is therefore desirable to design is applicable to the additive of vanadium chromium slag.
CN102534099A discloses " a kind of magnesium carbon ball improving splashing slag in converter effect ", and this invention relates to a kind of smelting
Gold steelmaking converter modification agent, a kind of magnesium carbon ball improving splashing slag in converter effect.Its raw material composition and mass percent
As follows: C:35%, MgO:55%, H2O:10%.CN102643947A discloses " a kind of side shortening the splashing slag in converter time
Method ", this patent is mentioned and being modified slag as modulation coolant with limestone and dolomite.CN102392097A discloses
" the residue adjustment processing method before a kind of splashing slag in converter ", this invention uses coke powder, magnesia, titanium dioxide to make slag adjusting agent, uses coke powder
Reducing and stay the ferrum oxide in slag, and react the dystectic titanium carbide of generation with titanium dioxide, titanium carbide improves with magnesia synergism
The viscosity of slag and fusion temperature.Document " developmental research of splashing slag in converter modification agent " (Anshan iron and steel plant technology, 2002.03, p30～
33) mention, can be by adding light dolomite at Primary period, middle and late stage is operated by oxygen rifle or is added coke blacking, adds after tapping
Light dolomite, magnesite complete the modification of slag.CN103525971A disclose " vanadium slag modification agent and preparation method thereof with
And converter extracting vanadium protecting method with splash slag ", the composition of the vanadium slag modification agent in this invention include by weight 2～5 parts C, 40～
The MgO of 60 parts, the CaO of 4～7 parts, the MnO of 10～30 parts, the SiO of 5～15 parts2, and its moisture is less than 3%.Described system
Preparation Method is by the magnesia of by weight 40～50 parts, 5～10 parts of carbonaceous materials and the manganese ore mix homogeneously of 40～60 parts, to obtain
Vanadium slag modification agent.CN103014224A discloses " a kind of method of converter extracting vanadium slag splashing ", completes laggard at converter tapping
Before row slag splashing, in converter, add granularity at the magnesia slag adjusting agent of below 3.0mm and carry out oxygen blast slag, can with acquisition
Stick to the thick state vanadium slag on converter lining.Wherein, described magnesia slag adjusting agent is fettling magnesite grain and carbon dust.CN102912072A is public
Having opened " a kind of converter extracting vanadium slag splashing low cost slag adjusting agent ", the chemical composition of described slag adjusting agent is wrapped by weight percentage
Include: the CaO and the H of no more than 3% of the MgO of C, 40%～72%, 4%～7% of 20%～50%2O, and formed described
The raw material of the MgO in slag adjusting agent includes waste magnesia carbon bricks.CN102925617A discloses " a kind of for converter extracting vanadium slag splashing
Slag adjusting agent ", the chemical composition of described slag adjusting agent includes by weight percentage: C, 40%～72% of 20%～50%
The CaO and the H of no more than 3% of MgO, 4%～7%2O.But above method is in addition to steelmaking converter slag as object, only relates to
And the slag splashing of vanadium slag, it is not directed to vanadium extraction chromium splashing slag in converter.
In terms of above-mentioned prior art, it is adaptable to the additive of vanadium extraction chromium splashing slag in converter yet there are no report, still belongs to precedent.
Summary of the invention
Present invention solves the technical problem that the additive being to provide vanadium extraction chromium splashing slag in converter.
The additive of vanadium extraction chromium splashing slag in converter of the present invention, is made up of the component of following weight portion:
The SiO of 30～75 weight portions2, the MgO and the little H being less than 3 weight portions of 20～70 weight portions2O。
Further, the additive of vanadium extraction chromium splashing slag in converter of the present invention is preferably by magnesia and quartz sand mixing
Become.
Wherein, the granularity of described magnesia and quartz sand is all preferably smaller than 5mm.
Further, SiO in described quartz sand2Percentage by weight more than 90%；The weight percent of MgO in described magnesia
Ratio is more than 90%.
Compared with prior art, the present invention has that production technology is simple, modify the advantages such as effective.Can not only be for vanadium extraction
Chromium converter provides the additive of high-quality, and can effectively reduce the fusing point of vanadium chromium slag, improves the vanadium chromium slag mobility after modification
And adhesiveness, use vanadium chromium slag that dross effect when carrying out slag splashing, can be improved after using, improve furnace lining erosion resistibility, have
Effect improves the vanadium extraction chromium converter lining life-span.
Detailed description of the invention
The additive of vanadium extraction chromium splashing slag in converter of the present invention, is made up of the component of following weight portion:
The SiO of 30～75 weight portions2, the MgO of 20～70 weight portions and the H less than 3 weight portions2O。
The additive of vanadium extraction chromium splashing slag in converter of the present invention is for when the molten iron of converter smelting containing vanadium and chromium resource,
Obtained by the feature that vanadium chromium slag melting point is high, dry, dross is difficult and configure, when adding in vanadium chromium slag, each component in additive
It is fitted to each other such that it is able to effectively reduce vanadium chromium slag melting point, improve the adhesiveness of vanadium chromium slag, strengthen and spatter slag and dross effect.Its
The fusing point of vanadium chromium slag is adjusted by middle MgO, improves the heat resistance spattering slag blanket, SiO2Reduce the fusing point of vanadium chromium slag, improve vanadium chromium
Slag mobility.
In the additive of the present invention, from safety considerations, when water content is excessive in additive, there is the danger of splash
Danger, therefore, in additive, water content is the fewest more good, and integrated cost factor, in the additive of the present invention, water content is not more than 3 weights
Amount part.
Dispensing for convenience, the additive of vanadium extraction chromium splashing slag in converter of the present invention is preferably mixed by magnesia and quartz sand
Form.
Wherein, the granularity of described magnesia and quartz sand all be preferably smaller than 5mm, so can in shorter oxygen blow duration incite somebody to action
Melt material slagging, ensures that certain granularity can reduce blanking process dust generation amount simultaneously.
Further, SiO in described quartz sand2Percentage by weight more than 90%；The weight percent of MgO in described magnesia
Ratio is more than 90%.
Concrete, the additive of vanadium extraction chromium splashing slag in converter of the present invention can be adopted and obtain with the following method:
Using magnesia, quartz sand is raw material, and by each raw material mix homogeneously by a certain percentage, mixed proportion is according to raw material
Grade is determined, and the additive component scope obtained is: SiO230～75 weight portions, MgO 20～70 weight portion, H2O≤3 weight
Amount part.Wherein, SiO in described quartz sand2Percentage by weight more than 90%, granularity < 5mm；The weight of MgO in described magnesia
Percentage ratio is more than 90%, granularity < 5mm.
Below in conjunction with embodiment, the detailed description of the invention of the present invention is further described, the most therefore the present invention is limited
System is among described scope of embodiments.
Embodiment 1
Using magnesia, active lime is raw material, by each raw material mix homogeneously by a certain percentage, additive component scope
For: SiO230%, MgO 67%, H2O 3%.
In vanadium extraction chromium splashing slag in converter, after using this additive, can effectively reduce vanadium chromium slag melting point, improve vanadium chromium slag
Adhesiveness, strengthen spatter slag and dross effect.And after using this additive to adjust vanadium chromium slag and spatter slag, continue vanadium extraction chromium 4 stove, stove
The overall still ratio before spattering slag thick 1～2mm of lining.
Embodiment 2
Using magnesia, active lime is raw material, by each raw material mix homogeneously by a certain percentage, additive component scope
For: SiO275%, MgO 23%, H2O 2%.
In vanadium extraction chromium splashing slag in converter, after using this additive, can effectively reduce vanadium chromium slag melting point, improve vanadium chromium slag
Adhesiveness, strengthen spatter slag and dross effect.And after using this additive to adjust vanadium chromium slag and spatter slag, continue vanadium extraction chromium 3 stove, stove
The overall still ratio before spattering slag thick 2～3mm of lining.
Embodiment 3
Using magnesia, active lime is raw material, by each raw material mix homogeneously by a certain percentage, additive component scope
For: SiO255%, MgO 42%, H2O 3%.
In vanadium extraction chromium splashing slag in converter, after using this additive, can effectively reduce vanadium chromium slag melting point, improve vanadium chromium slag
Adhesiveness, strengthen spatter slag and dross effect.And after using this additive to adjust vanadium chromium slag and spatter slag, continue vanadium extraction chromium 6 stove, stove
The overall still ratio before spattering slag thick 0～1mm of lining.
Claims (4)
1. additive purposes in vanadium extraction chromium splashing slag in converter, described additive is made up of the component of following weight portion: 30
～75 SiO of weight portion2, the MgO of 20～70 weight portions and the H less than 3 weight portions2O。
The additive the most according to claim 1 purposes in vanadium extraction chromium splashing slag in converter, it is characterised in that add described in:
Add agent to be mixed by magnesia and quartz sand.
The additive the most according to claim 2 purposes in vanadium extraction chromium splashing slag in converter, it is characterised in that: described magnesium
The granularity of sand and quartz sand is respectively less than 5mm.
The additive the most according to claim 2 purposes in vanadium extraction chromium splashing slag in converter, it is characterised in that: described stone
SiO in sand2Percentage by weight more than 90%；In described magnesia, the percentage by weight of MgO is more than 90%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510114193.8A CN104694702B (en) | 2015-03-16 | 2015-03-16 | The additive of vanadium extraction chromium splashing slag in converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510114193.8A CN104694702B (en) | 2015-03-16 | 2015-03-16 | The additive of vanadium extraction chromium splashing slag in converter |
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| CN104694702A CN104694702A (en) | 2015-06-10 |
| CN104694702B true CN104694702B (en) | 2016-12-14 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534099A (en) * | 2012-03-06 | 2012-07-04 | 通化市宇鑫耐火材料有限公司 | MgO-C ball capable of improving splashing slag furnace protection effect of converter |
| CN102912069A (en) * | 2012-10-31 | 2013-02-06 | 攀钢集团研究院有限公司 | Low-cost slag splashing protection method of vanadium extraction converter |
| CN103397133A (en) * | 2013-07-11 | 2013-11-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for protecting converter with vanadium slag |
| CN103882177A (en) * | 2012-12-24 | 2014-06-25 | 攀钢冶金材料有限责任公司 | Modifier for vanadium extraction converter protection and preparation method thereof, and converter protection method |
-
2015
- 2015-03-16 CN CN201510114193.8A patent/CN104694702B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534099A (en) * | 2012-03-06 | 2012-07-04 | 通化市宇鑫耐火材料有限公司 | MgO-C ball capable of improving splashing slag furnace protection effect of converter |
| CN102912069A (en) * | 2012-10-31 | 2013-02-06 | 攀钢集团研究院有限公司 | Low-cost slag splashing protection method of vanadium extraction converter |
| CN103882177A (en) * | 2012-12-24 | 2014-06-25 | 攀钢冶金材料有限责任公司 | Modifier for vanadium extraction converter protection and preparation method thereof, and converter protection method |
| CN103397133A (en) * | 2013-07-11 | 2013-11-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for protecting converter with vanadium slag |
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