CN105200190A - Desulfurization carburant capable of improving quality of by-product molten iron of titanium slag electric furnace and preparation method - Google Patents
Desulfurization carburant capable of improving quality of by-product molten iron of titanium slag electric furnace and preparation method Download PDFInfo
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- CN105200190A CN105200190A CN201510744725.6A CN201510744725A CN105200190A CN 105200190 A CN105200190 A CN 105200190A CN 201510744725 A CN201510744725 A CN 201510744725A CN 105200190 A CN105200190 A CN 105200190A
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- desulfurization
- carburelant
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Abstract
The invention belongs to the technical field of titanium slag smelting, and particularly relates to a desulfurization carburant capable of improving quality of by-product molten iron of a large titanium slag electric furnace and preparation and usage methods of the desulfurization carburant. The technical scheme is that the desulfurization carburant capable of improving the quality of the by-product molten iron of the large titanium slag electric furnace is provided, and the desulfurization carburant is a pellet prepared from raw materials including 50%-90% by mass of an iron material, 10%-30% by mass of a carbon material, 5%-15% by mass of a desulfurizing agent and 0.5%-1.5% by mass of a binding agent. The desulfurization carburant is prepared with a simple technology from the cheap raw materials, can effectively reduce the content of S in the by-product molten iron of the large titanium slag electric furnace, increases the content of C, effectively improves the quality of the by-product molten iron, effectively enlarges the application range and has good application prospect.
Description
Technical field
The invention belongs to titanium slag technical field of smelting, being specifically related to the desulfurization carburelant quality for improving titanium slag electric furnace byproduct iron quality and preparation and application thereof.
Background technology
Use Flos Bombacis Malabarici ilmenite concentrate smelting titanium slag, a lot of producer has grasped the technology and device technology using Flos Bombacis Malabarici ilmenite concentrate smelting titanium slag at present, and Absorbable organic halogens produces TiO
2at the titanium slag product of 74%, not only meet the Production requirement of sulfate process titanium dioxide, also can be applicable to titanium sponge fused salt chlorimation explained hereafter titanium tetrachloride, achieve significant benefit.But due to the problem of the S content in ilmenite concentrate high (being generally 0.3% ~ 1.0%), cause the S content in by-product molten iron higher (0.6% ~ 1.0%), C content lower (0.7% ~ 1.0%), the value of molten iron is very low.Therefore there is a kind of technology of very large requirement developing, to reduce S content's index in molten iron, to improve the C content of molten iron, reach the object improving molten iron and be worth.
Summary of the invention
The technical problem to be solved in the present invention is that existing titanium slag smelting by-product iron sulphur content is too high, the technical problem that carbon content is too low.The technical scheme of technical solution problem is provide a kind of desulfurization carburelant improving titanium slag electric furnace byproduct iron quality.This desulfurization carburelant is the pelletizing that iron charge, carbon material, sweetening agent and binding agent obtain as raw material, and the massfraction ratio between described raw material is iron charge 50% ~ 90%, carbon material 10% ~ 30%, sweetening agent 5% ~ 15%, binding agent 0.5 ~ 1.5%.
Wherein, iron charge described in above-mentioned desulfurization carburelant is at least one in iron filings, iron scale or iron powder.
Wherein, described in above-mentioned desulfurization carburelant, the TFe of iron charge is not less than 80%.
Wherein, carbon material described in above-mentioned desulfurization carburelant be fixed carbon content 70 ~ 99% hard coal or refinery coke.
Wherein, described in above-mentioned desulfurization carburelant, sweetening agent is CaO or CaC
2in at least one.
Wherein, described in above-mentioned desulfurization carburelant, binding agent is sodium bentonite.
Wherein, the density domination of pelletizing described in above-mentioned desulfurization carburelant is at 3.0g/cm
3~ 4.5g/cm
3.
The present invention still further provides the preparation method in above-mentioned desulfurization carburelant, the method comprises the following steps: get iron charge, carbon material, sweetening agent and binding agent in proportion and be prepared into compound, compacting balling-up, then under 150 DEG C ~ 250 DEG C conditions, dry 20min ~ 40min makes pelletizing, obtains desulfurization carburelant.Raw material Control granularity is less than 3mm.
Wherein, the pressure index of ball press described in aforesaid method controls at 12MPa ~ 20MPa.Ball press pressure is preferably 18Mpa.The wire velocity control of ball press roller skin is at 10cm/s ~ 25cm/s.Preferably, the linear velocity of ball press roller skin is 15cm/s.
Wherein, when being prepared into compound, according to circumstances adding suitable quantity of water in the feed in addition and being mixed evenly, obtaining blended stock.General amount of water can be 2% ~ 4% of raw material weight.
The size of pelletizing can be selected as required.Generally can be controlled in: long 25mm ~ 35mm, wide 20mm ~ 30mm, high 10mm ~ 20mm.
Simultaneously, present invention also offers a kind of method improving large-scale titanium slag electric furnace byproduct iron quality, the method is in the process of ilmenite concentrate smelting titanium slag, and before titanium slag is come out of the stove, 5min ~ 10min adds above-mentioned desulfurization carburelant, add overall control in stove molten iron total amount 5% ~ 10%.Further, above-mentioned desulfurization carburelant 5min ~ 10min before electric furnace is slagged tap adds, slag tap to the end time of slagging tap be 20min ~ 25min, latter about 5 minutes molten iron dischargings of having gone on business.Desulfurization carburelant and molten iron contact reacts time are at about 30min ~ 40min.Desulfurization carburelant add overall control in stove molten iron total amount 5% ~ 10%.The inventive method is particularly applicable to the Large Electric Furnace of more than 20MVA.
Beneficial effect of the present invention is: inventive desulfurization carburelant uses cheap raw material, and easy technique is prepared from, and effectively effectively can reduce the content of S in large-scale titanium slag electric furnace by-product molten iron, improve the content of C simultaneously; Molten iron viscosity can also be made to reduce simultaneously, be conducive to slag sluicing system, reduce the problem with iron in slag, effectively improve quality and the range of application of by-product molten iron, there is good application prospect.
Specific embodiment
The inventive method specifically can by following scheme implementation:
One, desulfurization carburelant
Desulfurization carburelant of the present invention is the pelletizing being mixed compacting by following raw material:
A-iron-bearing materials, TFe content controls more than 80%, and the iron content particle cheap with waste iron filing, iron scale etc. or fine powder are for main raw;
B-carbonaceous material, adopt fixed carbon content 70 ~ 99% hard coal or refinery coke;
C-sweetening agent, adopts CaO, CaC
2deng material;
D-binding agent, common sodium bentonite.
Massfraction is according to A (50% ~ 90%), and B (10% ~ 30%), C (5% ~ 15%), binding agent adopts common sodium bentonite D, and add-on controls according to 0.5 ~ 1.5%.A+B+C+D total amount=100%, as the raw material preparing material E.
Two, the preparation of desulfurization carburelant
The preparation method of inventive desulfurization carburelant specifically can be: according to circumstances add suitable quantity of water at material E and be mixed evenly in mixing pan, obtains mixed material F.Amount of water can be 2% ~ 4% of material E weight.Adopt high-pressure ball press F to be pressed into fine and close pelletizing G, the pressure index of ball press controls at 18Mpa, and the wire velocity control of ball press roller skin is at 15cm/s, and the size range of pelletizing can be controlled in: long 25mm ~ 35mm, wide 20mm ~ 30mm, high 10mm ~ 20mm.
Pelletizing G dry 20min ~ 40min under 150 DEG C ~ 250 DEG C conditions obtains pelletizing H (desulfurization carburelant).The density domination of pelletizing H exists: 3.0g/cm
3~ 4.5g/cm
3.
Three, desulfurization carburelant is used to improve the method for large-scale titanium slag electric furnace byproduct iron quality
Large-scale titanium slag electric furnace is generally provided with independent slag notch and iron notch, and pelletizing 5min ~ 10min before slagging tap at electric furnace adds, and slags tap to slagging tap the end time generally at 20min ~ 25min, latter about 5 minutes molten iron dischargings of having gone on business.Therefore pelletizing H and molten iron contact reacts time are at about 30min ~ 40min.Pelletizing add overall control in stove molten iron total amount 5% ~ 10%.
Below by way of specific embodiment, the inventive method is further illustrated.
Embodiment 1
Get waste iron filing 60%, hard coal (fixed carbon content 87%) 25%, CaO13%, wilkinite 2% component material E, raw material granularity is less than 3mm; The water that material E adds 2% mixed prepares blended stock F.
Blended stock F is at high-pressure ball press upper pressing ball, and the pressure index of ball press controls at 18Mpa, and the wire velocity control of ball press roller skin, at 15cm/s, obtains fine and close green pellets.Pelletizing is dry 30min under 200 DEG C of conditions, and obtain dry pelletizing G, density is at 3.50g/cm
3.
5min before ilmenite concentrate smelting is slagged tap, adds pelletizing 3000kg in 37500kg state molten iron; Slag tap time 20min, molten iron discharging after the complete 5min that slags tap.Detect the C content of molten iron of coming out of the stove at 2.0%, S content 0.2%.
Embodiment 2
Get iron scale 70%, hard coal (fixed carbon content 87%) 15%, CaO13%, wilkinite 2% component material E, raw material granularity is less than 3mm; ; The water that material E adds 2% mixed prepares blended stock F.Blended stock F is at high-pressure ball press upper pressing ball, and the pressure index of ball press controls at 18Mpa, and the wire velocity control of ball press roller skin, at 20cm/s, obtains fine and close green pellets.Pelletizing is dry 30min under 200 DEG C of conditions, and obtain dry pelletizing, density is at 3.65g/cm
3.
8min before ilmenite concentrate smelting is slagged tap, in 71500kg molten iron, add pelletizing 5000kg, slag tap time 20min, molten iron discharging after the complete 5min that slags tap.Detect the C content of molten iron of coming out of the stove at 2.0%, S content 0.15%.
Embodiment 3
Get waste iron filing 75%, refinery coke (fixed carbon content 95%) 12%, CaO11%, wilkinite 2% component material E, raw material granularity is less than 3mm; The water that material E adds 2% mixed prepares blended stock F.Blended stock F is at high-pressure ball press upper pressing ball, and the pressure index of ball press controls at 18Mpa, and the wire velocity control of ball press roller skin, at 20cm/s, obtains fine and close green pellets.Pelletizing is dry 30min under 200 DEG C of conditions, and obtain dry pelletizing, density is at 3.80g/cm
3.
8min before ilmenite concentrate smelting is slagged tap, in 104000kg molten iron, add pelletizing 6250kg, slag tap time 25min, molten iron discharging after the complete 5min that slags tap.Detect the C content of molten iron of coming out of the stove at 2.2%, S content 0.10%.
In addition, also find in the above-described embodiments, after using inventive desulfurization carburelant, the iron-holder in titanium slag is reduced to 3 ~ 3.5% by about 4%, has obvious reduction.It is the viscosity using inventive desulfurization carburelant can reduce the iron particle of disperse in titanium slag that reason should be, and is conducive to the agglomeration of disperse iron particle and departs from melting titanium slag, and then reduces the abrasive grit inclusion content of titanium slag of coming out of the stove.
Claims (10)
1. improve the desulfurization carburelant of titanium slag electric furnace byproduct iron quality, it is characterized in that: described desulfurization carburelant is the pelletizing that iron charge, carbon material, sweetening agent and binding agent obtain as raw material, and the mass percent between described raw material is iron charge 50% ~ 90%, carbon material 10% ~ 30%, sweetening agent 5% ~ 15%, binding agent 0.5 ~ 1.5%.
2. desulfurization carburelant according to claim 1, is characterized in that: described iron charge is at least one in iron filings, iron scale or iron powder.
3. desulfurization carburelant according to claim 1, is characterized in that: the TFe of described iron charge is not less than 80%.
4. desulfurization carburelant according to claim 1, is characterized in that: described carbon material be fixed carbon content 70 ~ 99% hard coal or refinery coke.
5. desulfurization carburelant according to claim 1, is characterized in that: described sweetening agent is CaO or CaC
2in at least one.
6. desulfurization carburelant according to claim 1, is characterized in that: described binding agent is sodium bentonite.
7. desulfurization carburelant according to claim 1, is characterized in that: the density of described pelletizing is 3.0g/cm
3~ 4.5g/cm
3.
8. the preparation method of the desulfurization carburelant according to any one of claim 1 ~ 7, it is characterized in that: comprise the following steps: get iron charge, carbon material, sweetening agent and binding agent in proportion and be prepared into compound, compacting balling-up, then under 150 DEG C ~ 250 DEG C conditions, dry 20min ~ 40min makes pelletizing, obtains desulfurization carburelant.
9. according to method according to claim 8, it is characterized in that: the pressure index of ball press during described compacting balling-up is 12MPa ~ 20MPa; The linear velocity of ball press roller skin is 10cm/s ~ 25cm/s.
10. one kind is improved the method for large-scale titanium slag electric furnace byproduct iron quality, it is characterized in that: in the process of ilmenite concentrate smelting titanium slag, before titanium slag is come out of the stove, 5min ~ 10min adds above-mentioned desulfurization carburelant, add overall control in stove molten iron total amount 5% ~ 10%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111593168A (en) * | 2020-07-02 | 2020-08-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Slag iron separation accelerant and preparation method and use method thereof |
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| CN103343179A (en) * | 2013-07-26 | 2013-10-09 | 吴雪健 | Converter steelmaking synthetic slag former |
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Patent Citations (4)
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| CN101294242A (en) * | 2008-07-01 | 2008-10-29 | 攀钢集团研究院有限公司 | Method for extracting multi-metallic element from high chromium vanadium titanium octahedral iron ore |
| CN102251073A (en) * | 2011-07-08 | 2011-11-23 | 攀钢集团有限公司 | Deoxidizing and carburizing agent for semisteel, and preparation and application methods thereof |
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| CN111593168A (en) * | 2020-07-02 | 2020-08-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Slag iron separation accelerant and preparation method and use method thereof |
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Application publication date: 20151230 |