CN105349734A - Method adopting steel ladle casting residues and tailings for preparing high-aluminum slag modifier pellets and application thereof - Google Patents
Method adopting steel ladle casting residues and tailings for preparing high-aluminum slag modifier pellets and application thereof Download PDFInfo
- Publication number
- CN105349734A CN105349734A CN201510898068.0A CN201510898068A CN105349734A CN 105349734 A CN105349734 A CN 105349734A CN 201510898068 A CN201510898068 A CN 201510898068A CN 105349734 A CN105349734 A CN 105349734A
- Authority
- CN
- China
- Prior art keywords
- slag
- high alumina
- supplying agent
- ladle
- pelletizing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention belongs to the technical field of molten steel refining and provides a method adopting steel ladle casting residues and tailings for preparing high-aluminum slag modifier pellets and application thereof for treating and recycling the steel ladle casting residues, lowering the steelmaking production cost and optimizing the steelmaking refining process. The high-aluminum slag modifier pellets are composed of, by weight, 50-60% of fine powder of the steel ladle casting residues and tailings, 8-15% of alumina powder, 30-40% of aluminum particles or aluminum powder and binders, wherein the percent of the binders accounts for 1-3% of the total weight percent of the other three kinds of raw material. The high-aluminum slag modifier pellets are applied to the production process of low-carbon and aluminum steel and ultralow-carbon steel and have the advantages that the melting point is low, the melting speed is high, the slag mobility is good, the impurity adsorbing ability is high, and the effect of modifying slag, removing oxygen in the slag surface and lowering Als burning loss of finished molten steel is good.
Description
Technical field
The invention belongs to liquid steel refining technical field, be specifically related to one and utilize ladle residual casting slag tailings to prepare high alumina slag supplying agent pelletizing and method for making thereof and purposes.
Background technology
After molten steel casting, can remain a part of molten steel and slag in ladle, the molten steel of these remnants and slag are collectively referred to as ladle residual casting slag, and its main component is in table 1 (for certain steel mill domestic).
Ladle residual casting slag composition/% that table 1 certain steel mill domestic produces
From table 1, data can find out that most ladle residual casting slag has certain affinability, have wherein remained a certain amount of molten steel simultaneously.Now some steel mill domestic has achieved the online circulation and stress of part residual casting slag at present, but also has larger a part of ladle residual casting slag to need to be recycled by cold conditions.It is residual casting slag is fetched water to carry out hammer after cooling broken that the cold conditions of ladle residual casting slag reclaims main process, broken slag steel and the fritter residual casting slag obtaining bulk of hammer, fritter residual casting slag is again by broken, magnetic separation and screening obtain varigrained small dreg piece steel and residual casting slag tailings fine powder, wherein the slag steel of bulk and varigrained small dreg piece steel iron-holder higher, can well be utilized further, but it is low finally to process the residual casting slag tailings iron-holder obtained, utility value is not high, and granularity is thinner, in white powder ash shape, if this part residual casting slag tailings can not obtain appropriate disposal, overstock in stacking process and can produce a large amount of airborne dusts, cause environmental pollution.
The present inventor utilizes ladle residual casting slag tailings fine powder to prepare high alumina slag supplying agent pelletizing for providing one, for the treatment of, recycle ladle residual casting slag, reduce STEELMAKING PRODUCTION cost and optimize steel-making refinery practice.
Summary of the invention
In order to process, recycle ladle residual casting slag, reduce STEELMAKING PRODUCTION cost and optimize steel-making refinery practice, the invention provides a kind of utilize ladle residual casting slag tailings fine powder to prepare high alumina slag supplying agent pelletizing method and refining residue adjustment technique.
First technical problem that the present invention will solve is to provide a kind of high alumina slag supplying agent pelletizing, is made up of the component of following weight per-cent:
Ladle residual casting slag tailings fine powder 50 ~ 60%, calcined bauxite in powder 8 ~ 15%, aluminum shot or aluminium powder 30 ~ 40%, binding agent are that first three plants 1 ~ 3% of raw material gross weight;
Wherein said ladle residual casting slag tailings fine powder is by weight percentage containing CaO>=40%, Al
2o
310 ~ 25%, SiO2≤15%, S≤0.25%, its granularity control is at≤5mm; Described calcined bauxite in powder is by weight percentage containing Al
2o
3>=90%, S≤0.2%, its granularity control is at≤5mm; Described aluminum shot or aluminium powder are by weight percentage containing Al>=99.7%, and its granularity control is at 3 ~ 8mm; Described pellet binder is hydroxypropylcellulose.
Wherein, above-mentioned high alumina slag supplying agent pelletizing by weight percentage: particle diameter is part≤5% of part >=95% of 25 ~ 50mm, particle diameter≤5mm.
Wherein, above-mentioned high alumina slag supplying agent pelletizing percentage of damage≤5.0%, so-called percentage of damage refers to the intensity of finished product high alumina slag supplying agent pelletizing, detection method is: a certain amount of finished product high alumina slag supplying agent pelletizing drops down onto horizontal concrete floor or steel plate from 2m eminence, all pelletizings be scattered are collected, sieve with the sample preparation of 5mm sieve aperture, weigh to being less than 5mm part, the per-cent that this part weight being less than 5mm granularity accounts for gross weight is percentage of damage.
Wherein, above-mentioned high alumina slag supplying agent pelletizing water content≤1.5% by weight percentage.
Wherein, above-mentioned high alumina slag supplying agent pelletizing chemical composition is: CaO20.0 ~ 35.0%, SiO
2≤ 10.0%, Al
2o
315.0 ~ 25.0%, metal A l>=30.0%, S≤0.2, and inevitable impurity.
Second technical problem to be solved by this invention is to provide the preparation method of above-mentioned high alumina slag supplying agent pelletizing, and the method comprises the steps:
A, mixing: first ladle residual casting slag tailings fine powder, calcined bauxite in powder, aluminum shot or aluminium powder are dry mixed mixing, then add binding agent in raw material after mixing and be dry mixed, until mixing.
B, shaping: to add water in the material that step a mixes, after mixing, carry out coldmoulding.
C, drying: after coldmoulding, natural drying is dry, then high alumina slag supplying agent pelletizing is obtained after toasting drying.
Concrete, ladle residual casting slag tailings fine powder in the preparation method step a of above-mentioned high alumina slag supplying agent pelletizing, calcined bauxite in powder, aluminum shot (powder) mixing time and with the mixing time of binding agent to ensure mixing of materials evenly.Concrete, the time that is dry mixed of ladle residual casting slag tailings fine powder, calcined bauxite in powder, aluminum shot (powder) is 2 ~ 3min, and the time that is dry mixed after adding binding agent is 1 ~ 2min.
Concrete, the churning time that adds water in the preparation method step b of above-mentioned high alumina slag supplying agent pelletizing is 2 ~ 3min.
Concrete, the preparation method step b amount of water of above-mentioned high alumina slag supplying agent pelletizing accounts for 5 ~ 6% of starting material gross weight.
Concrete, adopt the mode of spray to add water in the preparation method step b of above-mentioned high alumina slag supplying agent pelletizing, add water speed 0.45 ~ 0.54kg/s.
Concrete, can screen for the first time after coldmoulding in the preparation method step c of above-mentioned high alumina slag supplying agent pelletizing, and then natural drying is dry; Wherein, first screening adopts the sieve of 10mm sieve aperture to sieve, and adopts the mode of tiling to carry out seasoning, and pelletizing tiling thickness can not more than 30cm.
Concrete, in the preparation method step c of above-mentioned high alumina slag supplying agent pelletizing, the seasoning time is not less than 24h.
Concrete, toasting drying temperature in above-mentioned high alumina slag supplying agent pelletizing preparation method step c is 100 ~ 150 DEG C, and baking time is 8 ~ 12h.
Concrete, once sieve again after baking drying in above-mentioned high alumina slag supplying agent pelletizing preparation method step c.Concrete, screening step adopts the sieve of 5mm to sieve, to ensure that pelletizing granularity reaches requirement.
3rd technical problem to be solved by this invention is to provide the purposes of above-mentioned high alumina slag supplying agent pelletizing, and specifically high alumina slag supplying agent pelletizing is applied to steel-making refining residue adjustment technique.Concrete, for different steel grade refining residue adjustment:
A, for low-carbon (LC) aluminium steel series, for ladle top slag upgrading: bessemerizing after tapping terminates, the quantity of slag is stayed to add high alumina slag supplying agent pelletizing to the ladle top of the slag according to ladle, deoxidation, residue adjustment are carried out to the ladle top of the slag, reduces TFe content and oxidisability (MnO+FeO content) in ladle slag.Apply high alumina slag supplying agent pelletizing of the present invention and can replace traditional quickened lime, pre-melted refining slag, aluminum shot etc.
High alumina slag supplying agent pelletizing prepared by the present invention is a kind of compound pelletizing, after adding ladle, first endothermic melting, then, just react with ladle slag, wherein, slag adjustment of formula slag state in high alumina slag supplying agent, metallic aluminium then react with FeO in slag along with high alumina slag supplying agent dissolves gradually in ladle slag instead of with the dissolved oxygen direct reaction in molten steel, decrease the chance contacted with air with molten steel, preferentially can carry out modifying process to slag, effectively reduce the oxidisability of slag, and dark desulfurization can be carried out to molten steel further.Effectively prevent when to add separately slag making materials and metallic aluminium in refining process, Al and air can directly burn under directly contacting situation, cause the problem that utilization ratio is low.And when processing pre-deoxidation steel and ultra-low sulphur steel, metallic aluminium easily directly enters molten steel through slag blanket, cause oxygen activity in steel not reach processing requirements, and slag oxidisability is still higher; The upgrading deleterious of top slag, makes the growth of white slag time, and sweetening effectiveness difference waits series of problems.
B, for low-carbon (LC) aluminium steel series, adjust for finishing slag: after RH vacuum refinement process completes, again add high alumina slag supplying agent pelletizing to the ladle top of the slag, carry out residue adjustment, deoxidation further, reduce finishing slag oxidisability (MnO+FeO content), the scaling loss of the Als of this steel series in calm process in molten steel can be reduced.
C, for ultra low-carbon steel steel series, except finishing slag adjustment after RH refining except mentioning in technology point b in LF-RH duplex refinery practice terminates, ladle top slag upgrading link is placed on LF treatment process and carries out, in LF operation treating processes, stay the quantity of slag to add high alumina slag supplying agent pelletizing to the ladle top of the slag according to ladle exactly, for reducing slag beneficiation (MnO+FeO content), to improve slag fluidity, improve desulfating and deoxidation efficiency be that the refining of LF operation " is made white slag " and provided favourable condition.Adding of other slag charge operates according to steel grade processing requirement.
Concrete, above-mentioned high alumina slag supplying agent pelletizing is applied in low-carbon (LC) aluminium steel series refining residue adjustment technique a, adds high alumina slag supplying agent pelletizing 200 ~ 400kg having bessemerized after tapping terminates according to the quantity of slag of staying in ladle to the ladle top of the slag.
Concrete, above-mentioned high alumina slag supplying agent pelletizing is applied in low-carbon (LC) aluminium steel series refining residue adjustment technique b, and after RH vacuum-treat completes, the ladle departures forward direction ladle top of the slag adds high alumina slag supplying agent pelletizing 100 ~ 200kg.
Concrete, above-mentioned high alumina slag supplying agent pelletizing is applied in ultra low-carbon steel steel series refining residue adjustment technique c, in LF operation treating processes, stay the quantity of slag to add high alumina slag supplying agent pelletizing 200 ~ 400kg to the ladle top of the slag according to ladle.
Concrete, in the refining residue adjustment technique a of above-mentioned high alumina slag supplying agent pelletizing steel-making, b, c, when the ladle top of the slag adds high alumina slag supplying agent pelletizing, necessarily require high alumina slag supplying agent pelletizing can be distributed in the ladle top of the slag uniformly, to ensure residue adjustment effect.
Accompanying drawing explanation
Residual casting slag tailings recovery process schema after Fig. 1 Optimal improvements.
Embodiment
The high alumina slag supplying agent pelletizing that the present invention utilizes ladle residual casting slag tailings fine powder to produce is made up of the component of following weight per-cent:
Ladle residual casting slag tailings fine powder 50 ~ 60%, calcined bauxite in powder 8 ~ 15%, aluminum shot (powder) 30 ~ 40%, account for the pellet binder that first three plants raw material gross weight 1 ~ 3%; Wherein said ladle residual casting slag tailings fine powder is by weight containing CaO>=40%, Al
2o
310 ~ 25%, SiO
2≤ 15%, S≤0.25%, its granularity control is at 0 ~ 5mm; Described calcined bauxite in powder is by weight containing Al
2o
3>=90%, S≤0.2%, its granularity control is at 0 ~ 5mm; Described aluminum shot (powder) containing metal Al>=99.7% by weight, its granularity control is at 3 ~ 8mm; Described pellet binder hydroxypropylcellulose.The pH value of above-mentioned binding agent is in neutral; not containing acid, alkaloids; metal very active when reason is the metallic aluminium in high alumina slag supplying agent pelletizing; reductibility is strong; very easily react with acid-base class material, if be easy to containing acid-base class material the chemical property changing high alumina slag supplying agent product in binding agent.
Contriver finds, the main component in residual casting slag tailings is CaO, Al
2o
3, MgO, SiO
2deng, wherein CaO and Al
2o
3composition major part is with C
12a
7compound form exist, composition is almost identical with preliminary melting type calcium aluminate refining slag, this preliminary melting type calcium aluminate refining slag has that fusing point is low, thawing speed is fast, melt after the advantage such as good fluidity.Select to adopt residual casting slag tailings to make slag modifier for refining molten steel according to its advantage contriver.
Through assay, above-mentioned traditional technology collects FeO+MnO content in the residual casting slag tailings obtained up to more than 10%, and oxidisability is very high, and S content is on average about 0.5%, and foreign matter content is also in higher level.Trace it to its cause, mainly traditional residual casting slag tailings recovery process is relatively simple, and slag class secondary resource adopts the stacking of extensive style to dispose, and causes the tailings such as desulfurization slag to be mixed in residual casting slag, to cause in residual casting slag tailings the foreign matter contents such as S higher.Therefore the residual casting slag tailings that traditional technology is collected is directly used in production liquid steel refining residue adjustment product will certainly affect quality product, causes liquid steel refining effect undesirable.Therefore contriver is optimized improvement by research to the recovery process of residual casting slag tailings, and the residual casting slag tailings recovery process flow process after Optimal improvements is shown in Fig. 1.
Low for the foreign matter content finally obtained in Fig. 1 technique, the satisfactory tailings of granularity are defined as residual casting slag tailings fine powder by contriver.In Fig. 1 technique, critical process is the weathering process of white slag, and this process generally continues 5 ~ 7 days.In addition after weathering white powder magnetic separation, screening be also absolutely necessary, the foreign matter content in tailings can be reduced further like this and residual casting slag tailings fine powder granularity can be controlled.The residual casting slag tailings fine powder chemical composition that technique is chosen in Fig. 1 is in table 2:
Table 2 residual casting slag tailings fine powder chemical composition cartogram
Table 2 can find out oxidisability (FeO+MnO content) < 2.0% of residual casting slag tailings fine powder, and oxidisability is lower, and the foreign matter contents such as S, P are very low, can meet the production of high alumina slag supplying agent pelletizing in the present invention completely.
The preparation method of above-mentioned high alumina slag supplying agent pelletizing comprises the following steps:
A, ladle residual casting slag tailings fine powder, calcined bauxite in powder, aluminum shot (powder) sent in batch mixing stirrer successively by proportioning and carries out being dry mixed stirring, after mix and blend time 2 ~ 3min, add the binding agent accounting for above-mentioned three kinds of raw material gross weights 1 ~ 3% again, continue to be dry mixed stirring 1 ~ 2min, be dry mixed rear uniform in material spray account for the clean water of ladle residual casting slag tailings fine powder, calcined bauxite in powder, aluminum shot (powder) three kinds of raw material gross weights 5 ~ 6%, spray water while stirring, the spray rate of water controls at 0.45 ~ 0.54kg/s, and added water rear wet mixing 2 ~ 3min;
B, will to stir and fully wetting raw material is conveyed in chilling press by rotary conveyor that to be pressed into specification be the spherical of 30 ~ 50mm or ellipse spherical products;
C, by the high alumina slag supplying agent pelletizing of compression moulding through 10mm sieve aperture sieve screening after naturally tiling stacking drying be not less than 24h, thickness is stacked in tiling can not more than 30cm, want waterproof, insolation proof simultaneously, product strength can be made like this to be further improved and avoid high bake to crack;
D, dried high alumina slag supplying agent pelletizing is stacked in tiling naturally deliver in drying oven and carry out drying, at 100 ~ 150 DEG C of drying 8 ~ 12h;
After e, the drying of high alumina slag supplying agent pelletizing drying stove, naturally stack and be cooled to normal temperature, sieve with the sieve of 5mm sieve aperture, ensure its contained humidity by weight≤1.5%, granularity≤5mm moiety by weight ratio≤5%, it is for subsequent use that finally sampling detects the qualified warehouse-in of physical and chemical index.High alumina slag supplying agent pelletizing prepared in the present invention should meet following physical and chemical index:
The requirement of table 3 high alumina slag supplying agent pelletizing chemical index
The requirement of table 4 high alumina slag supplying agent pelletizing physical index
The high alumina slag supplying agent pelletizing utilizing prepared by above-mentioned starting material and preparation method is after physical and chemical index meets the demands after testing, carry out packaging according to steelmaking equipment process requirements can be transported to steelworks and use, operate according to high alumina slag supplying agent pelletizing steel-making refining residue adjustment technology point, to guarantee the result of use of high alumina slag supplying agent pelletizing in use procedure.
Below in conjunction with embodiment, the invention will be further described, but therefore do not limit the present invention among described scope of embodiments.
The ladle residual casting slag tailings fine powder adopted in embodiment, calcined bauxite in powder, aluminum shot (powder) physical and chemical index detection case are in table 5:
The main physical and chemical index detected result of starting material needed for table 5 embodiment
Binding agent used in embodiment is white solid powder, and be a kind of compound binding agent be made up of organism, main component is hydroxypropylcellulose, requires that its pH value is in neutral, not containing acid, alkaloids, commercially available.
Embodiment 1
The manufacture of a, high alumina slag supplying agent pelletizing
Carry out weigh batching with automatic weighing-batching system to ladle residual casting slag tailings fine powder, calcined bauxite in powder, aluminum shot (powder) three kinds of starting material, wherein ladle residual casting slag tailings fine powder, calcined bauxite in powder, aluminum shot (powder) respectively account for 58%, 10%, 32% of raw material gross weight; After these three kinds of starting material be delivered to carry out being dry mixed 2min by rotary conveyor in HN-500 type stirrer again, the binding agent of starting material gross weight 1% is added in stirrer, continue to be dry mixed 1min, be dry mixed the rear mode of spray that adopts to add water in raw material, the spray rate that adds water is 0.45kg/s, and total amount of water is 5% of raw material gross weight.Added water rear wet mixing 2min, wet feed after having stirred is delivered to the ellipse spherical products being pressed into 30mm ~ 50mm in XMQ-10 type ball press by rotary conveyor, on airing place, tiled solarization is carried out by belt-type automatic distributing system after adopting the sieve of 10mm sieve aperture to sieve for the first time, tiling thickness 30mm, natural drying time of drying is 24h, to waterproof be noted in natural drying drying process, avoid solar exposure.After seasoning completes, half-finished high alumina slag supplying agent pelletizing is delivered in GZY4*3*2 type dry kiln that to carry out baking dry, baking time of drying is 12h, and toasting drying temperature is 100 DEG C.Sieved by the sieve that dry for the baking high alumina slag supplying agent pelletizing completed carries out cooling rear 5mm sieve aperture, carry out being packaged into storehouse after having sieved for subsequent use, and quality test is carried out in sampling, its assay is in table 6.
Table 6 finished product high alumina slag supplying agent pellet quality assay
Physical index
Quality information as can be seen from table 6, the prepared every quality index of high alumina slag supplying agent pelletizing all reaches criterion of acceptability, and this batch of high alumina slag supplying agent pelletizing can drop into application.
The application of b, high alumina slag supplying agent pelletizing
Manufacture completes and the high alumina slag supplying agent pelletizing be up to the standards is used by the steel-making refinery process district 1# converter high hopper of Automobile Transportation to certain steelworks, this is applied to low-carbon (LC) aluminium steel series, and it smelts flow process is " → RH vacuum refinement → continuous casting is bessemerized in hot metal pretreatment → vanadium extraction by converter blowing process → 220 ton ".
1) ladle top slag upgrading
Bessemerizing after tapping terminates in smelting process, stay the quantity of slag to add 300 ~ 400kg high alumina slag supplying agent to the ladle top of the slag according to ladle and upgrading is carried out to ladle top slag, through range estimation, after adding high alumina slag supplying agent pelletizing, high alumina slag supplying agent pelletizing can melt rapidly, slagging is very fast, and can be good at fusing with converter slag, changes slag even.Add ladle slag before and after high alumina slag supplying agent pelletizing through sample examination and contrast composition in table 7.
Table 7 adds ladle slag composition correlation data/% before and after high alumina slag supplying agent
Data as can be seen from table 7, contrast oxidisability in slag (FeO+MnO content) and greatly reduce, be reduced to 2.68%, reduce 9.85 percentage points from average 12.53% before and after ladle top slag upgrading.The Al that in slag, deoxidation deoxidation produces
2o
3significantly increase.After measured, [O] average out to 1098ppm of converter endpoint molten steel in sample, after the slag upgrading of top, [O] average out to 708ppm in molten steel is measured after molten steel to RH vacuum processing stations, therefore can find out that ladle slag top slag upgrading does not cause a large amount of deoxidation of molten steel, ensure that the carrying out of natural vacuum decarburization in RH treating processes, and the consumption of deoxygenated alloy when also effectively can reduce RH process.And the Al in RH vacuum slag leaving from station
2o
3content, from average 24.72% rising to 32.41% before entering the station, illustrates that the ladle top slag after upgrading has stronger absorption Al
2o
3the ability be mingled with.
The upgrading effect below increasing high alumina slag supplying agent of the present invention and traditional ladle top slag modifier contrasts:
Supplement traditional ladle top slag modifier kind: general ladle top slag modifier is common slag modifier for refining molten steel, quickened lime, fluorite, conventional aluminium matter modification agent etc., the common aluminium matter modification agent of comparative example employing herein, main component is metallic aluminium, CaO, Al
2o
3deng.
Correlation data is as shown in table 8:
Upgrading effect comparison/the % of table 8 high alumina slag supplying agent and traditional ladle top slag modifier
Data as can be seen from table 8, after adopting high alumina slag supplying agent upgrading, in ladle top slag, oxidisability (FeO+MnO content) on average reduces 9.85 percentage points, and after adopting traditional modification agent to change a social system, in ladle top slag, oxidisability (FeO+MnO content) on average reduces 6.54 percentage points.This shows that the upgrading successful of high alumina slag supplying agent is better than traditional modification agent.
2) RH front finishing slag adjustment leaving from station
After RH vacuum refinement process completes, 100 ~ 200kg high alumina slag supplying agent pelletizing is added to the ladle top of the slag, finishing slag leaving from station is adjusted, controls further the oxidisability (FeO+MnO content) in ladle slag, prevent molten steel scaling loss of Als in finished product molten steel in calm process.Analyze after measured, high alumina slag supplying agent pelletizing is not adopted to carry out pushing up the heat of slag upgrading and finishing slag adjustment, to open to large bag arrival that to water average A ls scaling loss this section of calm process be 0.012% from vacuum is leaving from station, and through the heat of high alumina slag supplying agent pelletizing process, Als scaling loss average out to 0.005% in calm process is lower 0.007 percentage point than the heat without the process of high alumina slag supplying agent pelletizing.
Embodiment 2
The manufacture of a, high alumina slag supplying agent pelletizing
Carry out weigh batching with automatic weighing-batching system to ladle residual casting slag tailings fine powder, calcined bauxite in powder, aluminum shot (powder) three kinds of starting material, wherein ladle residual casting slag tailings fine powder, calcined bauxite in powder, aluminum shot (powder) respectively account for 50%, 15%, 35% of raw material gross weight; After these three kinds of starting material be delivered to carry out being dry mixed 3min by rotary conveyor in HN-500 type stirrer again, the binding agent of starting material gross weight 3% is added in stirrer, continue to be dry mixed 2min, be dry mixed the rear mode of spray that adopts to add water in raw material, the spray rate that adds water is 0.54kg/s, and total amount of water is 6% of raw material gross weight.Added water rear wet mixing 3min, wet feed after having stirred is delivered to the ellipse spherical products being pressed into 30mm ~ 50mm in XMQ-10 type ball press by rotary conveyor, on airing place, tiled solarization is carried out by belt-type automatic distributing system after adopting the sieve of 10mm sieve aperture to sieve for the first time, tiling thickness 30mm, natural drying time of drying is 24h, to waterproof be noted in natural drying drying process, avoid solar exposure.After seasoning completes, half-finished high alumina slag supplying agent pelletizing is delivered in GZY4*3*2 type dry kiln that to carry out baking dry, baking time of drying is 8h, and toasting drying temperature is 150 DEG C.Sieved by the sieve that dry for the baking high alumina slag supplying agent pelletizing completed carries out cooling rear 5mm sieve aperture, carry out being packaged into storehouse after having sieved for subsequent use, and quality test is carried out in sampling, its assay is in table 9.
Table 9 finished product high alumina slag supplying agent pellet quality assay
Physical index
Quality information as can be seen from table 9, the prepared every quality index of high alumina slag supplying agent pelletizing all reaches criterion of acceptability, and this batch of high alumina slag supplying agent pelletizing can drop into application.
The application of b, high alumina slag supplying agent pelletizing
Manufacture completes and the high alumina slag supplying agent pelletizing be up to the standards is used by the LF refining furnace high hopper of Automobile Transportation to certain steelworks, this is applied to Ultra-low carbon steel series, and it smelts flow process is " hot metal pretreatment → bessemerize → LF refining → RH refining → continuous casting ".
1) LF refining treatment
Before LF refining heating, the quantity of slag is stayed to add 200 ~ 400kg high alumina slag supplying agent to the deoxidation of carrying out of ladle slag slag to the ladle top of the slag according to ladle, through range estimation, after adding high alumina slag supplying agent pelletizing, high alumina slag supplying agent pelletizing can melt rapidly, slagging is very fast, and can be good at fusing with other slag charges and converter slag, changes slag even." white slag is made " effective in heat-processed.Through sample examination add high alumina slag supplying agent pelletizing heat LF to set off in slag oxidisability (FeO+MnO content) with do not add high alumina slag supplying agent pelletizing heat correlation data in table 10.
Oxidisability contrast in table 10LF process departures slag
From table 10, data can find out in LF refining process that in the heat departures slag adding high alumina slag supplying agent pelletizing, oxidisability average out to 1.20% is starkly lower than and does not add 3.23% of high alumina slag supplying agent pelletizing heat, on average low 2.03 percentage points.And " making white slag " is effective and speed is fast in the heat refining heat-processed adding high alumina slag supplying agent pelletizing, substantially increase refining desulfuration efficiency, and the rear bits of heat refining heating not adding high alumina slag supplying agent pelletizing are canescence, there is the obvious sign that oxidisability in slag is strong.
The ladle slag deoxidation effect below increasing high alumina slag supplying agent of the present invention and traditional activated lime+aluminum shot contrasts:
Correlation data is as shown in table 11:
The ladle slag deoxidation effect contrast/% of table 11 high alumina slag supplying agent and traditional activated lime+aluminum shot
Data as can be seen from table 11, after the deoxidation of employing high alumina slag supplying agent, in ladle slag, oxidisability (FeO+MnO content) is lower 2.03 percentage points than not using, and after employing quickened lime+aluminum shot deoxidation, in ladle slag, oxidisability (FeO+MnO content) is lower 0.58 percentage point than not using.This shows that the deoxidation effect of high alumina slag supplying agent is obviously better than quickened lime+aluminum shot.
2) RH front finishing slag adjustment leaving from station
After RH vacuum refinement process completes, 100 ~ 200kg high alumina slag supplying agent pelletizing is added to the ladle top of the slag, finishing slag leaving from station is adjusted, controls further the oxidisability (FeO+MnO content) in ladle slag, prevent molten steel scaling loss of Als in finished product molten steel in calm process.Analyze after measured, high alumina slag supplying agent pelletizing is not adopted to carry out the heat of LF refining and finishing slag adjustment, to open to large bag arrival that to water average A ls scaling loss this section of calm process be 0.015% from vacuum is leaving from station, and through the heat of high alumina slag supplying agent pelletizing process, Als scaling loss average out to 0.006% in calm process is lower 0.009 percentage point than the heat without the process of high alumina slag supplying agent pelletizing.
Content according to technical background of the present invention and embodiment 1,2 can draw: high alumina slag supplying agent pelletizing involved in the present invention and refining residue adjustment technique thereof can not only optimize process for making, improve the quality of high-quality steel grade, and can the secondary resource that produces of this steel-making of efficient recovery ladle residual casting slag, reduce STEELMAKING PRODUCTION cost, reduce environmental pollution.Large scale investment production application has good economic benefit.
This shows that the high alumina slag supplying agent pelletizing mentioned by the present invention is a kind of high-quality supplementary material realizing efficient, energy-conservation, green steel-making, have a extensive future.And the high alumina slag supplying agent pelletizing application art related in invention is the optimization to variety steel smelting technology, increases substantially the quality in high-quality steel, be worthy of popularization.
In sum, will through reclaiming accurately machined this residual casting slag fine powder with addition of a certain amount of aluminum shot (powder) and calcined bauxite in powder, and a certain proportion of pelletizing binding agent can be used for producing steel-making refining high alumina slag supplying agent pelletizing, what the production of this kind of high alumina slag supplying agent pelletizing adopted is cold pressing pelletizing, baking drying process.Apply through industrial production, this kind of high alumina slag supplying agent is applied in the production technique of low-carbon (LC) aluminium steel series and ultra low-carbon steel steel series, there is fusing point low, thawing speed is fast, slag fluidity is good, absorption is mingled with the advantages such as ability is strong, and has good residue adjustment, the oxygen removed in the top of the slag, reduces finished product molten steel Als scaling loss effect.Utilize residual casting slag tailings fine powder to produce high alumina slag supplying agent pelletizing and can not only reclaim steel-making secondary resource, reduce production cost, and this high alumina slag supplying agent pelletizing is easy to use, without the need to manually adding thus reducing the labour intensity of direct labor, and residual casting slag tailings can be avoided to stack the environmental pollution being not good at causing.The comprehensive utilization of ladle residual casting slag is listed " Iron And Steel Industry " 12 " development program " three large focus technology in and one of is innovated in addition.
Claims (9)
1. high alumina slag supplying agent pelletizing, is characterized in that: be made up of the component of following weight per-cent:
Ladle residual casting slag tailings fine powder 50 ~ 60%, calcined bauxite in powder 8 ~ 15%, aluminum shot or aluminium powder 30 ~ 40%, binding agent are that first three plants 1 ~ 3% of raw material gross weight;
Wherein said ladle residual casting slag tailings fine powder is by weight percentage containing CaO>=40%, Al
2o
310 ~ 25%, SiO
2≤ 15%, S≤0.25%, its granularity≤5mm; Described calcined bauxite in powder is by weight percentage containing Al
2o
3>=90%, S≤0.2%, its granularity≤5mm; Described aluminum shot or aluminium powder are by weight percentage containing Al>=99.7%, and its granularity is 3 ~ 8mm; Described pellet binder is hydroxypropylcellulose.
2. high alumina slag supplying agent pelletizing according to claim 1, is characterized in that: meet following at least one item:
Described high alumina slag supplying agent pelletizing is by weight percentage: particle diameter is part≤5% of part >=95% of 25 ~ 50mm, particle diameter≤5mm;
Described high alumina slag supplying agent pelletizing percentage of damage≤5.0%;
Described high alumina slag supplying agent pelletizing water content≤1.5% by weight percentage;
Described high alumina slag supplying agent pelletizing chemical composition is: CaO20.0 ~ 35.0%, SiO
2≤ 10.0%, Al
2o
315.0 ~ 25.0%, metal A l>=30.0%, S≤0.2, and inevitable impurity.
3. the preparation method of the high alumina slag supplying agent pelletizing described in claim 1 or 2, is characterized in that: comprise the steps:
A, mixing: first ladle residual casting slag tailings fine powder, calcined bauxite in powder, aluminum shot or aluminium powder are dry mixed mixing, then add binding agent in raw material after mixing and be dry mixed, until mixing;
B, shaping: to add water in the material that step a mixes, after mixing, carry out coldmoulding;
C, drying: after coldmoulding, natural drying is dry, then high alumina slag supplying agent pelletizing is obtained after toasting drying.
4. the preparation method of high alumina slag supplying agent pelletizing according to claim 3, is characterized in that: meet following at least one item:
In step a, the time that is dry mixed of ladle residual casting slag tailings fine powder, calcined bauxite in powder, aluminum shot or aluminium powder is 2 ~ 3min, and the time that is dry mixed after adding binding agent is 1 ~ 2min;
The churning time that adds water in step b is 2 ~ 3min;
Step b amount of water accounts for 5 ~ 6% of starting material gross weight;
Adopt the mode of spray to add water in step b, add water speed 0.45 ~ 0.54kg/s;
In step c, natural drying is dry; The mode of tiling is adopted to carry out seasoning; Further preferably, pelletizing tiling thickness is no more than 30cm;
In step c, the seasoning time is not less than 24h;
Screen for the first time after coldmoulding in step c, and then natural drying is dry;
Further preferably, described first screening adopts the sieve of 10mm sieve aperture to sieve;
Toasting drying temperature in step c is 100 ~ 150 DEG C, and baking time is 8 ~ 12h;
Once sieve again after baking drying in step c;
Further preferably, once sieve again after described baking drying, adopt the sieve of 5mm to sieve.
5. the high alumina slag supplying agent pelletizing described in claim 1 or 2 is applied to steel-making refining residue adjustment technique.
6. purposes according to claim 5, is characterized in that: described in be applied to steel-making refining residue adjustment technique at least meet following any one:
A, for low-carbon (LC) aluminium steel series, for ladle top slag upgrading: bessemerizing after tapping terminates, stay the quantity of slag to add high alumina slag supplying agent pelletizing to the ladle top of the slag according to ladle, deoxidation, residue adjustment are carried out to the ladle top of the slag, reduce TFe content and oxidisability in ladle slag;
B, for low-carbon (LC) aluminium steel series, to adjust for finishing slag: after RH vacuum refinement process completes, again add high alumina slag supplying agent pelletizing to the ladle top of the slag, carry out residue adjustment, deoxidation further, reduce finishing slag oxidisability;
C, for ultra low-carbon steel steel series, adjust for finishing slag in LF-RH duplex refinery practice, and be placed on LF treatment process in ladle top slag upgrading link and carry out: 1) after RH vacuum refinement process completes, again add high alumina slag supplying agent pelletizing to the ladle top of the slag, carry out residue adjustment, deoxidation further, reduce finishing slag oxidisability; 2) in LF operation treating processes, stay the quantity of slag to add high alumina slag supplying agent pelletizing to the ladle top of the slag according to ladle, for reducing slag beneficiation, improve slag fluidity, raising desulfating and deoxidation efficiency.
7. purposes according to claim 6, it is characterized in that: described high alumina slag supplying agent pelletizing is applied in low-carbon (LC) aluminium steel series refining residue adjustment technique b, after RH vacuum-treat completes, the ladle departures forward direction ladle top of the slag adds high alumina slag supplying agent pelletizing 100 ~ 200kg.
8. purposes according to claim 6, it is characterized in that: described high alumina slag supplying agent pelletizing is applied in ultra low-carbon steel steel series refining residue adjustment technique c, in LF operation treating processes, stay the quantity of slag to add high alumina slag supplying agent pelletizing 200 ~ 400kg to the ladle top of the slag according to ladle.
9. purposes according to claim 6, is characterized in that: in the refining residue adjustment technique a of described high alumina slag supplying agent pelletizing steel-making, b, c, when the ladle top of the slag adds high alumina slag supplying agent pelletizing, enable high alumina slag supplying agent pelletizing be distributed in the ladle top of the slag uniformly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510898068.0A CN105349734A (en) | 2015-12-08 | 2015-12-08 | Method adopting steel ladle casting residues and tailings for preparing high-aluminum slag modifier pellets and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510898068.0A CN105349734A (en) | 2015-12-08 | 2015-12-08 | Method adopting steel ladle casting residues and tailings for preparing high-aluminum slag modifier pellets and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105349734A true CN105349734A (en) | 2016-02-24 |
Family
ID=55325793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510898068.0A Pending CN105349734A (en) | 2015-12-08 | 2015-12-08 | Method adopting steel ladle casting residues and tailings for preparing high-aluminum slag modifier pellets and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105349734A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106755743A (en) * | 2016-12-14 | 2017-05-31 | 攀枝花钢城集团有限公司 | For the high alumina slag adjusting agent pelletizing preparation method of liquid steel refining |
| CN109825666A (en) * | 2018-08-09 | 2019-05-31 | 黄龙 | A kind of formula and preparation method thereof of free-floride slagging agent |
| CN111004886A (en) * | 2019-11-25 | 2020-04-14 | 湖南华菱涟源钢铁有限公司 | Smelting method for reducing unit consumption of molten iron |
| EP3670677A1 (en) * | 2018-12-17 | 2020-06-24 | S.A. Lhoist Recherche Et Developpement | Process for manufacturing a slag conditioning agent for steel desulfurization |
| CN112680567A (en) * | 2020-12-09 | 2021-04-20 | 钢城集团凉山瑞海实业有限公司 | High-aluminum slag modifier for LF (ladle furnace) and preparation method thereof |
| CN114214482A (en) * | 2021-12-01 | 2022-03-22 | 钢城集团凉山瑞海实业有限公司 | Pellet for adsorbing aluminum oxide inclusion in steel ladle molten steel |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1410556A (en) * | 2002-10-17 | 2003-04-16 | 江苏江南铁合金有限公司 | Aluminium slag ball and its preparation method |
| KR20090101685A (en) * | 2008-03-24 | 2009-09-29 | 주식회사 알덱스 | Activator for slag of ladle in steel refining process |
| CN102586544A (en) * | 2012-03-20 | 2012-07-18 | 西峡县恒基冶材有限公司 | High-calcium pre-molten slag modification aluminium slag ball and preparation method thereof |
| CN105112651A (en) * | 2015-09-28 | 2015-12-02 | 攀枝花钢城集团有限公司 | High-aluminum slag modifier pellets and production method thereof |
-
2015
- 2015-12-08 CN CN201510898068.0A patent/CN105349734A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1410556A (en) * | 2002-10-17 | 2003-04-16 | 江苏江南铁合金有限公司 | Aluminium slag ball and its preparation method |
| KR20090101685A (en) * | 2008-03-24 | 2009-09-29 | 주식회사 알덱스 | Activator for slag of ladle in steel refining process |
| CN102586544A (en) * | 2012-03-20 | 2012-07-18 | 西峡县恒基冶材有限公司 | High-calcium pre-molten slag modification aluminium slag ball and preparation method thereof |
| CN105112651A (en) * | 2015-09-28 | 2015-12-02 | 攀枝花钢城集团有限公司 | High-aluminum slag modifier pellets and production method thereof |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106755743A (en) * | 2016-12-14 | 2017-05-31 | 攀枝花钢城集团有限公司 | For the high alumina slag adjusting agent pelletizing preparation method of liquid steel refining |
| CN109825666A (en) * | 2018-08-09 | 2019-05-31 | 黄龙 | A kind of formula and preparation method thereof of free-floride slagging agent |
| EP3670677A1 (en) * | 2018-12-17 | 2020-06-24 | S.A. Lhoist Recherche Et Developpement | Process for manufacturing a slag conditioning agent for steel desulfurization |
| EP3670678A1 (en) * | 2018-12-17 | 2020-06-24 | S.A. Lhoist Recherche Et Developpement | Process for manufacturing a slag conditioning agent for steel desulfurization |
| WO2020127039A1 (en) * | 2018-12-17 | 2020-06-25 | S.A. Lhoist Recherche Et Developpement | Process for manufacturing a slag conditioning agent for steel desulfurization |
| CN111004886A (en) * | 2019-11-25 | 2020-04-14 | 湖南华菱涟源钢铁有限公司 | Smelting method for reducing unit consumption of molten iron |
| CN112680567A (en) * | 2020-12-09 | 2021-04-20 | 钢城集团凉山瑞海实业有限公司 | High-aluminum slag modifier for LF (ladle furnace) and preparation method thereof |
| CN114214482A (en) * | 2021-12-01 | 2022-03-22 | 钢城集团凉山瑞海实业有限公司 | Pellet for adsorbing aluminum oxide inclusion in steel ladle molten steel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105349734A (en) | Method adopting steel ladle casting residues and tailings for preparing high-aluminum slag modifier pellets and application thereof | |
| CN105112651A (en) | High-aluminum slag modifier pellets and production method thereof | |
| CN101353708B (en) | Nickel iron smelting process with nickel oxide ore and stainless steel production wastes as raw materials | |
| CN104789718A (en) | Steel slag recycling method | |
| CN109652643B (en) | High-quality sinter for COREX smelting reduction iron-making process and preparation method thereof | |
| CN102337378B (en) | Process for removing non-metallic inclusions in molten steel | |
| CN103103310B (en) | Vanadium extraction cold pressing block and preparation method and applications thereof and vanadium extraction method | |
| CN101818263A (en) | Method for reclaiming zinc-iron-containing dust and sludge | |
| CN109295316A (en) | The recovery process of vanadium in vanadium containing steel slag | |
| CN105219907A (en) | The iron-smelting process of high-phosphor oolitic hematite gas base directly reducing-mill ore magnetic selection | |
| CN102051428A (en) | Iron extracting and steelmaking process for comprehensively treating copper ore tailing and nickel molten slag | |
| WO2021244616A1 (en) | Two-step method for efficiently separating iron and phosphorus in high-phosphorus iron-bearing resource on basis of gas-based energy | |
| CN106521096A (en) | High aluminum slag modifier pellet and preparation method thereof | |
| CN104498672A (en) | Method for desulfurizing molten iron | |
| CN109338027A (en) | A kind of coverter pig pre-melted type compound slagging agent and preparation method thereof | |
| CN101413042B (en) | Slag-forming constituent and preparation thereof | |
| CN108774683A (en) | A kind of high magnesium composite sinter and its production method | |
| CN101109027A (en) | Method for producing ball iron with iron scale | |
| CN101691621A (en) | Method of producing sponge iron from carbon dedusting ash and iron scales | |
| CN101435020B (en) | Method for producing titanium-rich material from titanium ore concentrate | |
| CN101469378B (en) | Method for preparing alsifer from high-alumina fly ash and magnetic beads | |
| CN101967530B (en) | Method for reducing iron by smelting reduction in electrometallurgy | |
| CN103031430B (en) | Method for making sintering bed charge by returning mine at high mixture ratio | |
| CN101818264A (en) | Method for treating zinc-iron-containing dust and sludge | |
| CN107326198A (en) | A kind of processing method and system of high phosphorus low-grade manganese carbonate ore |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160224 |