CN104673963A - Slag modifier for slag splashing protection of vanadium-chromium recovery converter - Google Patents
Slag modifier for slag splashing protection of vanadium-chromium recovery converter Download PDFInfo
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- CN104673963A CN104673963A CN201510114237.7A CN201510114237A CN104673963A CN 104673963 A CN104673963 A CN 104673963A CN 201510114237 A CN201510114237 A CN 201510114237A CN 104673963 A CN104673963 A CN 104673963A
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- slag
- vanadium
- chromium
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- splashing
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Abstract
The invention relates to a slag modifier 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 modifier for slag splashing protection of the vanadium-chromium recovery converter. The slag modifier is prepared from the following constituents in parts by weight: 40-70 parts of SiO2, 20-45 parts of MgO, 5-10 parts of CaO, and not more than 3 parts of H2O. Compared with the prior art, the slag modifier disclosed by the invention has the advantages of simple production process, good modification effect and the like; the high-quality slag modifier 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 supplying agent 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 adopts Technology of Slag Splashingfor Furnace Maintenance, significantly improves converter lining life, is risen to 15658 heats of nineteen ninety-five by 6200 heats of nineteen ninety.After adopting Technology of Slag Splashingfor Furnace Maintenance, the consumption of converter refractory materials reduces about 25% ~ 50%.Japan's converter lining life is not high, generally at 6000 ~ 8000 stoves.Under slag splashing condition, Wuhan Iron and Steel Plant is by the systematic study of converter long service life, and the highest furnace life reaches more than 30,000 stoves, and multiple blown converter the highest more than 10,000 stoves in age of Baosteel, generally 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, what generally adopt is vertical oxygen marksmanship.Its process characteristic is: utilize top blow oxygen lance to switch nitrogen, splash, through the finishing slag of modification, is coated in converter lining inwall.By the change of spray angle, can on purpose concentrate certain position of splash.Before blowing, add the excessive rhombspar of people and lime, because oversaturated magnesium oxide slag alleviates the erosion of furnace lining mutually between the blowing process.In addition, foamy slag forms protective layer on furnace lining.Improving the bonding strength of to spatter between slag blanket and backup lining brick the two, is the key improving slag splashing effect.
At present, the production method producing vanadium slag is both at home and abroad more, and mainly contain New Zealand's hot metal ladle and blow vanadium technique, South Africa shaking ladle process for extracting vanadium, Russia and Chinese vanadium extraction by converter blowing technique etc., other process for extracting vanadium also comprises v-bearing steel slag vanadium extraction, process for extracting vanadium from stone coal etc.The production process system of domestic and international vanadium extraction by converter blowing is and adds updating of refrigerant+process temperature+duration of blast.Vanadium extraction from hot metal is a selective oxidation technology.The vanadium extraction of converter air feed is an exothermic process, [Si], [Mn], [V], element oxide such as [C] makes molten bath be rapidly heated, and [Si], before [Mn] oxidation occurs in [V] oxidation, vanadium extraction can not suppress it to react, and [C], [V] invert point is greatly about about 1385 DEG C, therefore high oxidation rate and [V] yield of [V] will be obtained, vanadium-raising cooling agent must be added, control bath temperature to make it to approach [C], [V] invert point, reach the object 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 vanadium extracting process is oxidized to master with vanadium early stage, and the later stage is reduced to master with vanadium, but to blow vanadium process be that vanadium is reduced to master.So what adopt when lowering the temperature is add refrigerant to make molten iron temperature drop to suitable scope, by the control of duration of blast and process temperature in converter smelting, by the vanadium oxidation in half steel, improve recovery rate.
Converter extracting vanadium is due to its production singularity, its safeguard and long service life technical study less, because tap to tap time is short, temperature is low, in slag, eutectic mixture composition is few, slag fluidity is poor, before arrival smelting endpoint for converter extracting vanadium, in molten iron, C and O reaction does not fully launch, PCO, PCO in furnace gas
2lower, and PO
2higher, slag bad adhesion, causes magnesia carbon brick to be exposed in oxygen atmosphere, impels C and O
2reaction, the above lining erosion speed of iron liquid level is below iron liquid level.The above furnace lining of iron liquid level is the mode repeated action peeling off by the direct decarburization of oxygen → loose embrittlement → erosion → reoxidize substantially, and brick body is deteriorated gradually.Produce vanadium rate for improving as far as possible, extraction smelting of vanadium is relatively stricter to Control for Kiln Temperature, and the mode adding part pig usually can be adopted to carry out auxiliary temperature-reducing.So charging side not only by the impact of molten iron, also will be subject to the impact of pig, because furnace temperature is low, slag, in block, carries out omnidistance rigid mechanical shock to operational layer brick during blowing together with molten iron, therefore mechanical shock is the major cause of converter extracting vanadium converter bottom and body bottom 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, and reserves 3,600,000,000 tons, containing Cr
2o
3up to 1,800 ten thousand tons, it is the nearly twice of other areas, whole nation proven reserve.Chromium type high red lattice vanadium titano-magnetite be not only climb large mining area, Xisi, be also domestic vanadic titanomagnetite deposit maximum at present.The huge stratiform that storage of mineral deposits is formed in early Hercynian period-divide in different Granitic Complex like stratiform neutral and alkali-base-Ultrabasic, magmatic differentiation is good, belongs to late magmatic crystallization-differentiation deposit.Ore body forms 8 relatively independent big-and-middle-sized mining areas, and withered mining area, its Road rock mass thickness is large, and all kinds of ledge is complete, and ore body scale is large, and research degree is the highest, and this district i.e. alleged " Hongge Deposit district ", is divided into again in " southern mining area " and " northern mining area ".Different from the resource such as mining heritages, ore deposit, Baima of periphery, Hongge Deposit is except being rich in the metals such as iron, vanadium, titanium, and the also altogether metal such as association chromium, nickel, cobalt, is China's super-huge multielement mineral intergrowth few in number, has very high comprehensive utilization value.For the chromium element of association, red Ge Nan mining area Cr
2o
3grade reaches 0.34%, and chromium resource reserves are very considerable.China is the large stainless steel producing country of the first in the world, and domestic chrome ore can not meet consumers demand far away, every year all need from the high-grade chromite of external import and ferrochrome.The chromium metallurgy of China and chromic salts industry have very high dependency degree to external chromite.Therefore, for the country of the such chromium resource shortage of China, the mass-producing recovery realizing chromium resource in high-chromic vanadium-titanium ferroferrite has very important economic worth and strategic importance.And the recycling of vanadium chromium resource mainly carries out oxid-reclamatiom by converter in molten iron, its Lining Erosion Mechanism is close with converter extracting vanadium, although vanadium slag slag splashing has had report and has used, but still there is a great difference in nature in vanadium chromium slag and vanadium slag, owing to there being the existence of Cr2O3, vanadium chromium slag slag state is more dry, poor fluidity, fusing point are high, directly can not carry out slag splashing, the vanadium slag slag splashing slag supplying agent agent protecting method with splash slag simultaneously reported all cannot be used for vanadium chromium slag slag splashing, therefore needs to design the slag supplying agent being applicable to 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 metallurgical steel-making converter modification agent, i.e. a kind of magnesium carbon ball improving splashing slag in converter effect.Its starting material composition and mass percent as follows: C:35%, MgO:55%, H
2o:10%.
cN102643947Adisclose " a kind of method shortening the splashing slag in converter time ", this patent is mentioned and is carried out upgrading as modulation refrigerant to slag with Wingdale and rhombspar.CN102392097A discloses " the residue adjustment treatment process before a kind of splashing slag in converter ", this invention adopts coke powder, magnesia, titanium dioxide to make slag supplying agent, the ferric oxide stayed in slag is reduced with coke powder, and react with titanium dioxide and generate dystectic titanium carbide, titanium carbide and magnesia act synergistically the viscosity and temperature of fusion that improve slag.Document " development research of splashing slag in converter modification agent " (Anshan iron and steel plant technology, 2002.03, p30 ~ 33) mention, by adding light dolomite at Primary period, middle and later periods is operated by oxygen rifle or adds coke powder, adds light dolomite, wagnerite to complete the upgrading of slag after tapping.CN103525971A discloses " vanadium slag modification agent and preparation method thereof and converter extracting vanadium protecting method with splash slag ", the composition of the vanadium slag modification agent in this invention comprise by weight 2 ~ 5 parts C, 40 ~ 60 parts MgO, the CaO of 4 ~ 7 parts, the MnO of 10 ~ 30 parts, the SiO of 5 ~ 15 parts
2, and its moisture content is less than 3%.Described preparation method is by the magnesia of 40 ~ 50 parts, the manganese ore of 5 ~ 10 parts of carbonaceous materials and 40 ~ 60 parts mix, to obtain vanadium slag modification agent by weight.CN103014224A discloses " a kind of method of converter extracting vanadium slag splashing ", carry out slag splashing after converter tapping completes before, in converter, adding granularity at the magnesia slag supplying agent of below 3.0mm carries out oxygen blast slag, to obtain the thick state vanadium slag that can stick on converter lining.Wherein, described magnesia slag supplying agent is fettling magnesite grain and carbon dust.CN102912072A discloses " a kind of converter extracting vanadium slag splashing low cost slag supplying agent ", and the chemical composition of described slag supplying agent comprises by weight percentage: the C of 20% ~ 50%, the MgO of 40% ~ 72%, 4% ~ 7% CaO and be not more than 3% H
2o, and the raw material forming the MgO in described slag supplying agent comprises waste magnesia carbon bricks.CN102925617A discloses " a kind of slag supplying agent for converter extracting vanadium slag splashing ", and the chemical composition of described slag supplying agent comprises by weight percentage: the C of 20% ~ 50%, the MgO of 40% ~ 72%, 4% ~ 7% CaO and be not more than 3% H
2o.But above method except with steel-making converter slag for except object, only relate to the slag splashing of vanadium slag, do not relate to vanadium extraction chromium splashing slag in converter.
From above-mentioned prior art, the slag supplying agent being applicable to vanadium extraction chromium splashing slag in converter yet there are no report, still belongs to precedent.
Summary of the invention
The technical problem that the present invention solves is to provide the slag supplying agent of vanadium extraction chromium splashing slag in converter.
The slag supplying agent of vanadium extraction chromium splashing slag in converter of the present invention, is made up of the component of following weight part:
The SiO of 40 ~ 70 weight parts
2, the MgO of 20 ~ 45 weight parts, the CaO of 5 ~ 10 weight parts and the little H being no more than 3 weight parts
2o.
Further, the slag supplying agent of vanadium extraction chromium splashing slag in converter of the present invention is preferably mixed by magnesia, quartz sand and quickened lime.
Wherein, the granularity of described magnesia, quartz sand and quickened lime is all preferably less than 5mm.
Further, SiO in described quartz sand
2weight percent be greater than 90%; In described magnesia, the weight percent of MgO is greater than 90%; In described quickened lime, the weight percent of CaO is greater than 75%.
Compared with prior art, the present invention has the advantages such as production technique is simple, upgrading is effective.The slag supplying agent of high-quality can not only be provided for the converter of vanadium extraction chromium, and effectively can reduce the fusing point of vanadium chromium slag, improve the vanadium chromium slag mobility after upgrading and adhesivity, dross effect can be improved when using rear employing vanadium chromium slag to carry out slag splashing, improve furnace lining erosion resistibility, effectively improve the vanadium extraction chromium converter lining life-span.
Embodiment
The slag supplying agent of vanadium extraction chromium splashing slag in converter of the present invention, is made up of the component of following weight part:
The SiO of 40 ~ 70 weight parts
2, the MgO of 20 ~ 45 weight parts, the CaO of 5 ~ 10 weight parts and be no more than the H of 3 weight parts
2o.
The slag supplying agent of vanadium extraction chromium splashing slag in converter of the present invention is for when converter smelting contains the molten iron of vanadium chromium resource, high, dry, that dross the is difficult feature of the vanadium chromium slag melting point obtained configures, when adding in vanadium chromium slag, in slag supplying agent, each component is fitted to each other, thus effectively can reduce vanadium chromium slag melting point, improve the adhesivity of vanadium chromium slag, strengthen and spatter slag and dross effect.Wherein the fusing point of MgO to vanadium chromium slag adjusts, and improves the heat impedance of spattering slag blanket, and CaO plays mobility adjustment to vanadium chromium slag, SiO
2reduce the fusing point of vanadium chromium slag, improve vanadium chromium slag mobility.
In slag supplying agent of the present invention, consider from security standpoint, when water-content is excessive in slag supplying agent, there is the danger of splash, therefore, in slag supplying agent, water content is more few better, and comprehensive cost factor, in slag supplying agent of the present invention, water-content is not more than 3 weight parts.
Conveniently prepare burden, the slag supplying agent of vanadium extraction chromium splashing slag in converter of the present invention is preferably mixed by magnesia, quartz sand and quickened lime.
Wherein, the granularity of described magnesia, quartz sand and quickened lime is all preferably less than 5mm, by material melts slagging in shorter oxygen blow duration, can ensure that certain granularity can reduce blanking process dust generation so simultaneously.
Further, SiO in described quartz sand
2weight percent be greater than 90%; In described magnesia, the weight percent of MgO is greater than 90%; In described quickened lime, the weight percent of CaO is greater than 75%.
Concrete, the slag supplying agent of vanadium extraction chromium splashing slag in converter of the present invention can be adopted and obtain with the following method:
Use magnesia, quartz sand, quickened lime to be raw material, mixed by a certain percentage by each starting material, blending ratio is determined according to the grade of raw material, and the slag supplying agent composition range obtained is: SiO
240 ~ 70 weight parts, MgO 20 ~ 45 weight part, CaO 5 ~ 10 weight part, H
2o≤3 weight part.Wherein, SiO in described quartz sand
2weight percent be greater than 90%, granularity <5mm; In described magnesia, the weight percent of MgO is greater than 90%, granularity <5mm; Described quickened lime is that smelter commonly uses raw material, and the weight percent of its CaO is greater than 75%, granularity <5mm.
Below in conjunction with embodiment, the specific embodiment of the present invention is further described, does not therefore limit the present invention among described scope of embodiments.
Embodiment 1
Use magnesia, carbonaceous material, quickened lime to be raw material, mixed by a certain percentage by each starting material, slag supplying agent composition range is: SiO
242%, MgO 45%, CaO, 10%, H
2o 3%.
In vanadium extraction chromium splashing slag in converter, after using this slag supplying agent, effectively can reduce vanadium chromium slag melting point, improve the adhesivity of vanadium chromium slag, strengthen and spatter slag and dross effect.And use this slag supplying agent to adjust vanadium chromium slag after spattering slag, continue vanadium extraction chromium 5 stove, lining thickness is still than thick 3 ~ 5mm before spattering slag.
Embodiment 2
Use magnesia, carbonaceous material, quickened lime to be raw material, mixed by a certain percentage by each starting material, slag supplying agent composition range is: SiO
270%, MgO 20%, CaO, 7%, H
2o 3%.
In vanadium extraction chromium splashing slag in converter, after using this slag supplying agent, effectively can reduce vanadium chromium slag melting point, improve the adhesivity of vanadium chromium slag, strengthen and spatter slag and dross effect.And use this slag supplying agent to adjust vanadium chromium slag after spattering slag, continue vanadium extraction chromium 4 stove, lining thickness is still than thick 2 ~ 6mm before spattering slag.
Embodiment 3
Use magnesia, carbonaceous material, quickened lime to be raw material, mixed by a certain percentage by each starting material, slag supplying agent composition range is: SiO
250%, MgO 37%, CaO, 10%, H
2o 3%.
In vanadium extraction chromium splashing slag in converter, after using this slag supplying agent, effectively can reduce vanadium chromium slag melting point, improve the adhesivity of vanadium chromium slag, strengthen and spatter slag and dross effect.And use this slag supplying agent to adjust vanadium chromium slag after spattering slag, continue vanadium extraction chromium 6 stove, lining thickness is still than thick 1 ~ 3mm before spattering slag.
Claims (4)
1. the slag supplying agent of vanadium extraction chromium splashing slag in converter, is characterized in that, is made up of the component of following weight part:
The SiO of 40 ~ 70 weight parts
2, the MgO of 20 ~ 45 weight parts, the CaO of 5 ~ 10 weight parts and be no more than the H of 3 weight parts
2o.
2. the slag supplying agent of vanadium extraction chromium splashing slag in converter according to claim 1, is characterized in that: described slag supplying agent is mixed by magnesia, quartz sand and quickened lime.
3. the slag supplying agent of vanadium extraction chromium splashing slag in converter according to claim 2, is characterized in that: the granularity of described magnesia, quartz sand and quickened lime is all less than 5mm.
4. the slag supplying agent of vanadium extraction chromium splashing slag in converter according to claim 2, is characterized in that: SiO in described quartz sand
2weight percent be greater than 90%; In described magnesia, the weight percent of MgO is greater than 90%; In described quickened lime, the weight percent of CaO is greater than 75%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510114237.7A CN104673963B (en) | 2015-03-16 | 2015-03-16 | Slag modifier for slag splashing protection of vanadium-chromium recovery converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510114237.7A CN104673963B (en) | 2015-03-16 | 2015-03-16 | Slag modifier for slag splashing protection of vanadium-chromium recovery converter |
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| CN104673963A true CN104673963A (en) | 2015-06-03 |
| CN104673963B CN104673963B (en) | 2017-02-01 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101481747A (en) * | 2008-12-05 | 2009-07-15 | 首钢总公司 | Final slag modifier for smelting steel in converter and use method thereof |
| 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 |
| 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 CN201510114237.7A patent/CN104673963B/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 |
| CN101481747A (en) * | 2008-12-05 | 2009-07-15 | 首钢总公司 | Final slag modifier for smelting steel in converter and use method thereof |
| 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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