CN104673962B - Slag state regulator for slag splashing protection of vanadium-chromium recovery converter - Google Patents
Slag state regulator for slag splashing protection of vanadium-chromium recovery converter Download PDFInfo
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- CN104673962B CN104673962B CN201510113945.9A CN201510113945A CN104673962B CN 104673962 B CN104673962 B CN 104673962B CN 201510113945 A CN201510113945 A CN 201510113945A CN 104673962 B CN104673962 B CN 104673962B
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Abstract
The invention relates to a slag state regulator for slag splashing protection of a vanadium-chromium recovery converter, and belongs to the field of steel smelting. The technical problem to be solved is to provide the slag state regulator for slag splashing protection of the vanadium-chromium recovery converter. The slag state regulator is prepared from the following constituents in parts by weight: 45-75 parts of SiO2, 20-45 parts of MgO, 2-10 parts of CaO, and not more than 3 parts of H2O. Compared with the prior art, the slag state regulator disclosed by the invention has the advantages of simple production process, good modification effect and the like; the high-quality slag state regulator can be provided for the vanadium-chromium recovery converter; the melting point of the vanadium-chromium slag can be effectively reduced; the mobility and the adhesion of the modified vanadium-chromium slag can be improved; the slag adhering effect can be improved when the modified vanadium-chromium slag is used for slag splashing protection; the furnace lining anti-scouring performance can be improved; the service life of the furnace lining of the vanadium-chromium recovery converter can be effectively prolonged.
Description
Technical field
The present invention relates to the slag state regulator 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, LTV company of the U.S. develops first and adopts Technology of Slag Splashingfor Furnace Maintenance, is greatly improved and turns
In stove furnace life, risen to 15658 heats of nineteen ninety-five by 6200 heats of nineteen ninety.After Technology of Slag Splashingfor Furnace Maintenance, converter fire resisting
The consumption of material reduces by 25%～50% about.Japanese converter lining life is not high, typically in 6000～8000 stoves.In slag splashing
Under the conditions of, Wuhan Iron and Steel Plant passes through converter long service life system research, and highest furnace life reaches more than 30,000 stoves, multiple blown converter age highest more than 10,000 stove of Baosteel,
Typically in 6000～8000 stoves.
Protecting method with splash slag is divided into horizontal spray gun method, horizontal bottom blowing method, vertical bottom marksmanship, horizontal flame spraying, upright
Spray gun method etc..At present, commonly used is vertical oxygen rifle method.Its process characteristic is：Switch nitrogen, splash warp using top blow oxygen lance
Modified finishing slag, is coated on converter lining inwall.By the change of spray angle, can purposefully concentrate certain portion of splash
Position.Before blowing, plus the excessive dolomite of people and lime, because oversaturated magnesia slag phase alleviates invading of furnace lining during blowing
Erosion.Additionally, foamed slag forms protective layer on furnace lining.Improve and splash the bond strength of the two between slag blanket and backup lining brick, be to improve to splash
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 include 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 cooling agent+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]
So that molten bath is rapidly heated Deng element oxide, and [Si], [Mn] oxidation occur before [V] aoxidizes, vanadium extraction can not possibly suppress it anti-
Should, and [C], [V] conversion temperature be about at 1385 DEG C about, therefore to obtain the high oxidation rate of [V] and [V] yield it is necessary to plus
Enter vanadium-raising cooling agent, control bath temperature to be allowed to approach [C], [V] conversion temperature, reach the purpose that carbon is protected in vanadium extraction, [V] is down to
Less than 0.05%.The terminal half steel temperature of vanadium extraction is unsuitable too high, and based on vanadium oxidation, the later stage is reduced to vanadium extracting process early stage with vanadium
Main, but blowing vanadium process is based on vanadium reduction.Molten iron temperature is made to drop to suitably so use addition cooling agent in cooling
Scope, passes through the control of duration of blast and process temperature in converter smelting, the vanadium oxidation 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 due to smelting
Time is short, temperature is low, eutectic composition is few in slag, slag fluidity is poor, and before reaching smelting endpoint, in molten iron, C and O is anti-
Should not be sufficiently spread out, PCO, PCO in furnace gas2Relatively low, and PO2Higher, slag bad adhesion, lead to magnesia carbon brick to be exposed to oxygen
During atmosphere is enclosed, promote C and O2Reaction, the above lining wear in iron liquid face speed is apparently higher than below iron liquid face.The above stove in iron liquid face
Lining substantially repeated action in the way of the direct decarburization of oxygen → loose embrittlement → erosion is peeled off → reoxidized, makes brick body gradually
Deteriorated.Produce vanadium rate for improving as far as possible, extraction smelting of vanadium is relatively stricter to Control for Kiln Temperature to add part pig it will usually adopt
Mode carrys out auxiliary temperature-reducing.So, charging side is not only impacted by molten iron, the impacting of pig also to be subject to, because furnace temperature is low, stove
Slag is in bulk, carries out whole rigid mechanical shock to operational layer brick, therefore mechanical shock is converter extracting vanadium during blowing together with molten iron
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 maximum chromium ore resource of China,
3,600,000,000 tons of reserves, containing Cr2O3Up to 18,000,000 tons, be the nearly twice of other areas national proved reserves.Chromium type high red lattice vanadium
Titanomagnetite be not only climb the big mining area in Xisi, be also domestic current maximum vanadic titanomagnetite deposit.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 the big-and-middle-sized mining area in relatively independent 8, the withered mining area in its Road rock mass thickness
Greatly, all kinds of ledges are complete, and ore body scale is big, study degree highest, and this area is i.e. alleged " Hongge Deposit area ", is divided into " southern mining area " again
" northern mining area ".Different from resources such as the mining heritages of periphery, Baima ore deposits, Hongge Deposit in addition to rich in metals such as iron, vanadium, titaniums, also
The metal such as association chromium, nickel, cobalt, is China's super-huge multielement mineral intergrowth few in number, has very high comprehensive utilization valency altogether
Value.Taking the chromium of association as a example, red Ge Nan mining area Cr2O3Grade reaches 0.34%, and chromium resource reserves are very considerable.China is generation
Big stainless steel producing country of boundary first, domestic chrome ore much can not meet consumption demand, every year all need to be high-grade from external import
Chromite and ferrochrome.The chromium of China is metallurgical and chromic salts industry has very high dependency degree to external chromite.Therefore, for
For the country of China's such a chromium resource shortage, the scale recovery realizing chromium resource in high-chromic vanadium-titanium ferroferrite has
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
Still there is a great difference in vanadium slag, due to there being the presence of Cr2O3, vanadium chromium slag slag state is more dry, poor fluidity, fusing point in nature
, it is impossible to directly carry out slag splashing, the vanadium slag slag splashing slag state regulator agent protecting method with splash slag simultaneously reported is all no for height
Method is used for vanadium chromium slag slag splashing it is therefore desirable to design is applied to the slag state regulator of vanadium chromium slag.
CN102534099A discloses " a kind of magnesium carbon ball improving splashing slag in converter effect ", and this invention is related to a kind of smelting
Golden steelmaking converter modification agent, i.e. 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%.CN102643947ADisclose a kind of " side shortening the splashing slag in converter time
Method ", this patent is mentioned and as modulation cooling agent, slag being modified with lime stone and dolomite.CN102392097A discloses
" the residue adjustment processing method before a kind of splashing slag in converter ", this invention makees slag adjusting agent using coke powder, magnesia, titanium dioxide, uses coke powder
Reduce the iron oxide staying in slag, and react the dystectic titanium carbide of generation with titanium dioxide, titanium carbide is improved with magnesia synergy
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 in Primary period, the middle and later periods is operated by oxygen rifle or adds coke blacking, adds after tapping
Light dolomite, magnesite are completing 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～
60 parts of MgO, 4～7 parts of CaO, 10～30 parts of MnO, 5～15 parts of SiO2, and its moisture is less than 3%.Described system
The manganese ore of by weight 40～50 parts of magnesia, 5～10 parts of carbonaceous materials and 40～60 parts is mixed by Preparation Method, to obtain
Vanadium slag modification agent.CN103014224A discloses " a kind of method of converter extracting vanadium slag splashing ", completes laggard in converter tapping
Before row slag splashing, granularity is added in the magnesia slag adjusting agent of below 3.0mm and to carry out oxygen blast slugging into converter, 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
Open " 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 H of 20%～50% C, 40%～72% MgO, 4%～7% CaO and no more than 3%2O, and formed described
The raw material of the MgO in slag adjusting agent includes waste magnesia carbon bricks.CN102925617A discloses and " a kind of is used for converter extracting vanadium slag splashing
Slag adjusting agent ", the chemical composition of described slag adjusting agent includes by weight percentage：20%～50% C, 40%～72%
The H of MgO, 4%～7% CaO and no more than 3%2O.But above method, 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.
It is adaptable to the slag state regulator of vanadium extraction chromium splashing slag in converter yet there are no report in terms of above-mentioned prior art, still belong to
Precedent.
Content of the invention
Present invention solves the technical problem that being the slag state regulator providing vanadium extraction chromium splashing slag in converter.
The slag state regulator of vanadium extraction chromium splashing slag in converter of the present invention, is grouped into by the group of following weight portion：
The SiO of 45～75 weight portions2, the MgO of 20～45 weight portions, the CaO of 2～10 weight portions and little be less than 3 weights
The H of amount part2O.
Further, the slag state regulator of vanadium extraction chromium splashing slag in converter of the present invention is preferably by magnesia, quartz sand and work
Property lime mixes.
Wherein, the granularity of described magnesia, quartz sand and active lime is all preferably smaller than 5mm.
Further, SiO in described quartz sand2Percentage by weight be more than 90%；The weight percent of MgO in described magnesia
Than more than 90%；In described active lime, the percentage by weight of CaO is more than 75%.
Compared with prior art, the present invention has the advantages that simple production process, modification effect are good.It can not only be vanadium extraction
Chromium converter provides the slag state regulator of high-quality, and can effectively reduce the fusing point of vanadium chromium slag, improves the vanadium chromium slag stream after modification
Dynamic property and adhesiveness, carry out can improving dross effect using rear during slag splashing using vanadium chromium slag, improve furnace lining antiscour energy
Power, effectively improves the vanadium extraction chromium converter lining life-span.
Specific embodiment
The slag state regulator of vanadium extraction chromium splashing slag in converter of the present invention, is grouped into by the group of following weight portion：
The SiO of 45～75 weight portions2, the MgO of 20～45 weight portions, the CaO of 2～10 weight portions and be less than 3 weight
The H of part2O.
The slag state regulator of vanadium extraction chromium splashing slag in converter of the present invention is for the iron in converter smelting containing vanadium and chromium resource
During water, obtained vanadium chromium slag melting point is high, dry, dross is difficult feature and configure, when adding in vanadium chromium slag, slag state regulator
In each component be 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 splash slag and dross
Effect.Wherein MgO is adjusted to the fusing point of vanadium chromium slag, improves the heat resistance splashing slag blanket, and CaO plays mobility adjustment to vanadium chromium slag
Effect, SiO2Reduce the fusing point of vanadium chromium slag, improve vanadium chromium slag mobility.
In the slag state regulator of the present invention, from safety considerations, when in slag state regulator, water content is excessive, exist
The danger of splash, therefore, in slag state regulator, water content is more few better, and integrated cost factor, the slag state regulator of the present invention
Middle water content is not more than 3 weight portions.
Dispensing for convenience, the slag state regulator of vanadium extraction chromium splashing slag in converter of the present invention is preferably by magnesia, quartz sand
Mix with active lime.
Wherein, the granularity of described magnesia, quartz sand and active lime is all preferably smaller than 5mm, so can blow in shorter
By melt material slagging in the oxygen time, ensure that certain granularity can reduce blanking process dust yield simultaneously.
Further, SiO in described quartz sand2Percentage by weight be more than 90%；The weight percent of MgO in described magnesia
Than more than 90%；In described active lime, the percentage by weight of CaO is more than 75%.
Specifically, the slag state regulator of vanadium extraction chromium splashing slag in converter of the present invention can be adopted and be obtained with the following method：
The use of magnesia, quartz sand, active lime is raw material, each raw material is mixed by a certain percentage, mixed proportion
It is determined according to the grade of raw material, the slag state regulator composition range obtaining is：SiO245～75 weight portions, MgO 20～45
Weight portion, CaO 2～10 weight portion, H2O≤3 weight portion.Wherein, SiO in described quartz sand2Percentage by weight be more than
90%, granularity<5mm；In described magnesia, the percentage by weight of MgO is more than 90%, granularity<5mm；Described active lime is metallurgy
Enterprise commonly uses raw material, and the percentage by weight of its CaO is more than 75%, granularity<5mm.
With reference to embodiment, the specific embodiment of the present invention is further described, therefore the present invention is not limited
System is among described scope of embodiments.
Embodiment 1
The use of magnesia, carbonaceous material, active lime is raw material, each raw material are mixed by a certain percentage, slag state is adjusted
Whole dose of composition range be：SiO245%, MgO 45%, CaO 8%, H2O 2%.
In vanadium extraction chromium splashing slag in converter, after this slag state regulator, can effectively reduce vanadium chromium slag melting point, improve vanadium
The adhesiveness of chromium slag, strengthens and splashes slag and dross effect.And using this slag state regulator adjustment vanadium chromium slag and splash after slag, continue vanadium extraction
Chromium 6 stove, furnace lining totally still ratio splash thick 2～4mm before slag.
Embodiment 2
The use of magnesia, carbonaceous material, active lime is raw material, each raw material are mixed by a certain percentage, slag state is adjusted
Whole dose of composition range be：SiO275%, MgO 20%, CaO 2%, H2O 3%.
In vanadium extraction chromium splashing slag in converter, after this slag state regulator, can effectively reduce vanadium chromium slag melting point, improve vanadium
The adhesiveness of chromium slag, strengthens and splashes slag and dross effect.And using this slag state regulator adjustment vanadium chromium slag and splash after slag, continue vanadium extraction
Chromium 5 stove, furnace lining totally still ratio splash thick 1～3mm before slag.
Embodiment 3
The use of magnesia, carbonaceous material, active lime is raw material, each raw material are mixed by a certain percentage, slag state is adjusted
Whole dose of composition range be：SiO255%, MgO 32%, CaO 10%, H2O 3%.
In vanadium extraction chromium splashing slag in converter, after this slag state regulator, can effectively reduce vanadium chromium slag melting point, improve vanadium
The adhesiveness of chromium slag, strengthens and splashes slag and dross effect.And using this slag state regulator adjustment vanadium chromium slag and splash after slag, continue vanadium extraction
Chromium 3 stove, furnace lining totally still ratio splash thick 3～5mm before slag.
Claims (4)
1. purposes in vanadium extraction chromium splashing slag in converter for the slag state regulator, described slag state regulator is by the component of following weight portion
Composition：
The SiO of 45～75 weight portions2, the MgO of 20～45 weight portions, the CaO of 2～10 weight portions and less than 3 weight portions
H2O.
2. purposes in vanadium extraction chromium splashing slag in converter for the slag state regulator according to claim 1 it is characterised in that：Institute
State slag state regulator to be mixed by magnesia, quartz sand and active lime.
3. purposes in vanadium extraction chromium splashing slag in converter for the slag state regulator according to claim 2 it is characterised in that：Institute
The granularity stating magnesia, quartz sand and active lime is respectively less than 5mm.
4. purposes in vanadium extraction chromium splashing slag in converter for the slag state regulator according to claim 2 it is characterised in that：Institute
State SiO in quartz sand2Percentage by weight be more than 90%；In described magnesia, the percentage by weight of MgO is more than 90%；Described activity
In lime, the percentage by weight of CaO is more than 75%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510113945.9A CN104673962B (en) | 2015-03-16 | 2015-03-16 | Slag state regulator for slag splashing protection of vanadium-chromium recovery converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510113945.9A CN104673962B (en) | 2015-03-16 | 2015-03-16 | Slag state regulator for slag splashing protection of vanadium-chromium recovery converter |
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| CN104673962A CN104673962A (en) | 2015-06-03 |
| CN104673962B true CN104673962B (en) | 2017-02-22 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101603117A (en) * | 2008-06-12 | 2009-12-16 | 攀枝花新钢钒股份有限公司 | A kind of slag supplying agent and preparation method thereof and using method |
| CN102634630A (en) * | 2012-05-10 | 2012-08-15 | 首钢总公司 | Modifier for slag splashing protection of converter and using method of the modifier |
| CN102925617A (en) * | 2012-10-31 | 2013-02-13 | 攀钢集团研究院有限公司 | Slag adjusting agent for slag-splashing converter protection of vanadium extracting 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 |
-
2015
- 2015-03-16 CN CN201510113945.9A patent/CN104673962B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101603117A (en) * | 2008-06-12 | 2009-12-16 | 攀枝花新钢钒股份有限公司 | A kind of slag supplying agent and preparation method thereof and using method |
| CN102634630A (en) * | 2012-05-10 | 2012-08-15 | 首钢总公司 | Modifier for slag splashing protection of converter and using method of the modifier |
| CN102925617A (en) * | 2012-10-31 | 2013-02-13 | 攀钢集团研究院有限公司 | Slag adjusting agent for slag-splashing converter protection of vanadium extracting 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 |
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