CN106929631B - The dross method that high-titanium blast furnace slag carbonization is smelted - Google Patents
The dross method that high-titanium blast furnace slag carbonization is smelted Download PDFInfo
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- CN106929631B CN106929631B CN201710275606.XA CN201710275606A CN106929631B CN 106929631 B CN106929631 B CN 106929631B CN 201710275606 A CN201710275606 A CN 201710275606A CN 106929631 B CN106929631 B CN 106929631B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/54—Processes yielding slags of special composition
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Abstract
Disclosed by the invention is the dross method that a kind of high-titanium blast furnace slag carbonization in metal smelt field is smelted, its process is, titanium ore will be contained first, coke is added in electric furnace after being milled into powder, energization melting, make electrode centers to the molten bath for forming mobility between furnace lining inner wall, then power transmission power is increased, TiO is completed2Carburizing reagent, finally, to after reaction, reduce power transmission power, bath temperature is gradually reduced, in temperature-fall period, it is slowly solidified close to the dross product at furnace wall and in conjunction with furnace lining densification, when reaching ideal thickness wait hang thickness of slag layer, power transmission power is improved rapidly, makes remaining dross product that mobility be kept to be discharged from slag notch.It is combined closely using dross layer made from this method with furnace lining, the TiC for playing retaining wall in dross layer is consistent with the main component of final products, it will not fall off due to polluted product because of dross layer, to substantially prolong the service life of furnace lining while guaranteeing product quality, save generation maintenance cost.
Description
Technical field
The present invention relates to the dross methods that metal smelt field more particularly to a kind of carbonization of high-titanium blast furnace slag smelt.
Background technique
TiCl is prepared from blast furnace slag currently, climbing steel and having grasped one kind4New Techniques, one of them key technology is just
It is steel climbing high slag high temperature cabonization technique, is exactly to smelt molten state blast furnace slag with carbon with electric furnace for the simple process.From present
From the point of view of the condition of production of pilot-scale, electric furnace liner loss is serious, and service life is lower, and reason is in smelting process, melting
The TiO that state blast furnace slag is rich in2Chemical activity is extremely strong, can almost react with all refractory materials, to corrode fire resisting
Material.The electric furnace service life is influenced in order to avoid slag corrosion furnace lining, needs to retain on furnace lining certain thickness dross layer, makes to melt
Slag is isolated with furnace lining.
Summary of the invention
In order to solve the deficiencies of blast furnace slag high temperature cabonization technique furnace lining service life is lower, technology to be solved by this invention
Problem is: providing a kind of dross method that the high-titanium blast furnace slag carbonization that dross layer can be arranged on furnace lining is smelted.
The technical solution adopted by the present invention to solve the technical problems is: the dross side that high-titanium blast furnace slag carbonization is smelted
Method, comprising the following steps:
A, pre-process to containing titanium ore, coke, premixed after being milled into powder, wherein the proportion containing titanium ore and coke with
The content that reaction generates TiC is not less than subject to 30%；
B, premix is added in electric furnace, energization melting, makes electrode centers to forming the molten of mobility between furnace lining inner wall
Pond；
C, after molten bath is formed completely, power transmission power is further increased, completes TiO2Carburizing reagent；
D, after carburizing reagent reaches critical point, reduce power transmission power, gradually reduce bath temperature, in temperature-fall period, connect
Dross product at nearly furnace wall slowly solidifies and in conjunction with furnace lining densification, when reaching ideal thickness wait hang thickness of slag layer, mentions rapidly
High power transmission power makes remaining dross product that mobility be kept to be discharged from slag notch.
Further, what is selected in step a contains TiO in titanium ore2Percentage composition is 35~50%, Fe2O3Percentage composition≤
3%, carbon content >=80%, ash content≤5% are fixed in coke, the mass ratio containing titanium ore and coke is 1:1~1:1.5.
Further, when pre-processing in step a to raw material granularity≤2mm will be ground into containing titanium ore and coke
Powder.
Further, bath temperature is controlled at 1500 DEG C when carrying out energization melting in stepb based on melting materialss
Between~1600 DEG C.
Further, bath temperature is controlled at 1700 DEG C~1750 DEG C, with molten bath when carrying out carburizing reagent in step c
It acutely seethes, slag liquid level steeply rises, and open arc is exposed in molten bath as the foundation sufficiently reacted.
Further, being begun to decline in step d with slag liquid level, slag is obvious sticky as critical point, bath temperature
Gradually decrease to 1450 DEG C~1480 DEG C.
Further, finally formed thickness of slag layer of hanging is the 1/4~1/3 of lining thickness.
The beneficial effects of the present invention are: dross layer is arranged on furnace lining using this method, temperature range becomes during dross
Change obviously, so that dross layer is closer in conjunction with electric furnace liner, reduces the risk that dross layer falls off, and due to practical dross
A possibility that temperature is much larger than the temperature of molten state blast furnace slag carbonizing reduction generating process, can reduce slag corrosion dross layer is hung
The TiC for playing retaining wall in slag blanket is consistent with the main component of final products, will not fall off due to polluted product because of dross layer, thus
The service life that furnace lining is substantially prolonged while guaranteeing product quality, has saved generation maintenance cost.
Specific embodiment
Below by way of specific embodiment, the invention will be further described.
The dross method that high-titanium blast furnace slag carbonization is smelted, comprising the following steps:
A, pre-process to containing titanium ore, coke, premixed after being milled into powder, wherein the proportion containing titanium ore and coke with
The content that reaction generates TiC is not less than subject to 30%；
B, premix is added in electric furnace, energization melting, makes electrode centers to forming the molten of mobility between furnace lining inner wall
Pond；
C, after molten bath is formed completely, power transmission power is further increased, completes TiO2Carburizing reagent；
D, after carburizing reagent reaches critical point, reduce power transmission power, gradually reduce bath temperature, in temperature-fall period, connect
Dross product at nearly furnace wall slowly solidifies and in conjunction with furnace lining densification, when reaching ideal thickness wait hang thickness of slag layer, mentions rapidly
High power transmission power makes remaining dross product that mobility be kept to be discharged from slag notch.
Since the resulting final product of steel climbing high slag high temperature cabonization technique is TiC (percentage composition 13~15%), to keep away
Exempt from dross layer to melt in smelting and introduce other titaniferous impurity, need to guarantee TiC percentage composition >=30% in dross layer.Carry out
When the proportion of raw material, the mass ratio containing titanium ore and coke is according to TiO2Grade is different and is adjusted, according to Panzhihua locality ore
Ingredient, the consideration of the combined factors such as association reaction efficiency and quality, raw material optimal selection scheme are as follows: containing TiO in titanium ore2Percentage composition
For 35~50%, Fe2O3Percentage composition≤3%, fixes carbon content >=80% in coke, ash content≤5%, containing titanium ore and coke
Mass ratio is 1:1~1:1.5.In order to guarantee sufficiently to react with coke containing titanium ore, it preferably will contain titanium ore and coke is ground into granularity
Melting is carried out after the powder of≤2mm again.
Melting is divided into three phases, and the first stage is material melting, and second stage is carburizing reagent, and the phase III is solidification
Form dross layer.The material melting stage so that electrode centers between furnace lining inner wall formed the preferable molten bath of mobility subject to, melt
It is best between 1500 DEG C~1600 DEG C to refine temperature control.When granular material forms molten bath completely, carburizing reagent rank is just carried out
Section, the stage mainly make TiO2It is reacted with reduction carbon and generates TiC, reaction process needs high temperature, molten bath need to be made to be maintained at
1700 DEG C~1750 DEG C.Judge whether material sufficiently reacts, acutely seethed with molten bath, slag liquid level steeply rises, sudden and violent in molten bath
Expose open arc as the foundation sufficiently reacted；Judge whether reaction terminates, is then begun to decline with slag liquid level, slag is obviously sticky
For critical point, contain TiO in titanium ore at this time2To conversion ratio >=85% of TiC, dross product is basically formed.Enter after reaction
The phase III of melting, it is gradually reduced transmission power, so that bath temperature is gradually lowered to 1450 DEG C~1480 DEG C, in temperature-fall period
In, it can slowly be solidified close to the dross product at furnace wall and in conjunction with furnace lining densification, when reaching ideal thickness wait hang thickness of slag layer,
Power transmission power is improved rapidly, makes remaining dross product that mobility be kept to be discharged from electric furnace slag notch.It is eventually adhering on furnace lining
Dross forms the dross layer of one layer of protection furnace lining, and the extension thickness of slag layer for using this method to be formed can be the 1/4~1/ of lining thickness
3。
Embodiment one:
Dross layer is made with certain titanium-containing molten and separated slag and coke powder in 50KVA direct current electric arc furnace.Using 50KVA direct-current arc
Furnace, raw material proportioning are as follows: certain titanium-containing molten and separated slag 50%, petroleum coke 60%.Wherein TiO in certain titanium-containing molten and separated slag2Content is
45%, it is 82% that carbon content is fixed in petroleum coke, ash content 5%.Certain titanium-containing molten and separated slag and coke powder are milled into granularity first
The powder of≤2mm is added in direct current electric arc furnace after mixing and starts power transmission smelting.Incipient melting temperature is 1250 DEG C, to temperature
Powder is substantially all when degree reaches 1550 DEG C, in furnace melts and forms the preferable molten bath of mobility.Increase power transmission power, molten bath temperature
Degree is maintained at 1730 ± 20 DEG C, and molten bath is acutely seethed at this time, and slag liquid level steeply rises.When slag liquid level is begun to decline, slag
It can determine whether to terminate substantially for carburizing reagent after obviously becoming viscous, TiO in certain titanium-containing molten and separated slag of sample detection2To the conversion of TiC
Rate >=85%, thus dross product is formed.Power transmission power then is gradually reduced, declines bath temperature slowly, when molten bath center
When temperature is 1460 DEG C, slowly solidify close to the dross product at furnace wall and in conjunction with furnace lining densification, measuring extension thickness of slag layer is
The 1/3 of lining thickness, obtaining TiC percentage composition in dross layer finally by detection and analysis is 34.5%.
It can be seen that using this method to add dross layer for furnace lining, temperature range variation is obvious during dross, so that
Dross layer is tightly combined with electric furnace liner, reduces the risk that dross layer falls off, and since practical dross temperature is much larger than molten
The temperature for melting state blast furnace slag carbonizing reduction generating process, a possibility that can reducing slag corrosion dross layer, play retaining wall in dross layer
The TiC of effect and the main component of final products are consistent, will not fall off due to polluted product because of dross layer, thus guaranteeing product matter
The service life that furnace lining is substantially prolonged while amount has saved generation maintenance cost, has good practicability and society's warp
Ji value.
Claims (3)
1. the dross method that high-titanium blast furnace slag carbonization is smelted, characterized in that the following steps are included:
A, it pre-processes, is premixed after being milled into powder, wherein containing titanium ore with the proportion of coke to react to containing titanium ore, coke
The content for generating TiC is not less than subject to 30%；
B, premix is added in electric furnace, energization melting, makes electrode centers to the molten bath for forming mobility between furnace lining inner wall；
C, after molten bath is formed completely, power transmission power is further increased, completes TiO2Carburizing reagent；
D, after carburizing reagent reaches critical point, reduce power transmission power, bath temperature is gradually reduced, in temperature-fall period, close to furnace
Dross product at wall slowly solidifies and in conjunction with furnace lining densification, when reaching ideal thickness wait hang thickness of slag layer, improves send rapidly
Electrical power makes remaining dross product that mobility be kept to be discharged from slag notch；
What is selected in step a contains TiO in titanium ore2Percentage composition is 35~50%, Fe2O3Percentage composition≤3%, it is fixed in coke
Carbon content >=80%, ash content≤5%, the mass ratio containing titanium ore and coke are 1:1~1:1.5；
When carrying out energization melting in step b based on melting materialss, bath temperature is controlled between 1500 DEG C~1600 DEG C；
When carrying out carburizing reagent in step c, bath temperature is controlled at 1700 DEG C~1750 DEG C, is acutely seethed with molten bath, slag liquid
Face steeply rises, and open arc is exposed in molten bath as the foundation sufficiently reacted；
It is begun to decline in step d with slag liquid level, slag is obvious sticky as critical point, and bath temperature gradually decreases to 1450 DEG C
~1480 DEG C.
2. the dross method that high-titanium blast furnace slag carbonization as described in claim 1 is smelted, it is characterized in that: to raw material in step a
When being pre-processed, granularity≤2mm powder will be ground into containing titanium ore and coke.
3. the dross method that high-titanium blast furnace slag carbonization as described in claim 1 is smelted, it is characterized in that: finally formed dross
Layer is with a thickness of the 1/4~1/3 of lining thickness.
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| CN109913662B (en) * | 2019-04-28 | 2020-12-15 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for prolonging service life of high-titanium blast furnace slag carbonization electric furnace lining |
| CN110643826A (en) * | 2019-11-06 | 2020-01-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Furnace drying method for carbon-thermal method titanium extraction electric furnace |
| CN111876552A (en) * | 2020-08-07 | 2020-11-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for adhering slag to water-cooled wall electric furnace |
| CN112430745B (en) * | 2020-11-11 | 2023-01-31 | 昆明理工大学 | Slag adhering method for oxygen-enriched top-blown immersion smelting lead-smelting process spray gun |
| CN112668148B (en) * | 2020-12-04 | 2022-07-29 | 攀钢集团研究院有限公司 | Method for judging upper airflow distribution condition and furnace condition of high-titanium blast furnace |
| CN112880409B (en) * | 2021-01-12 | 2022-11-11 | 甘肃金麓银峰冶金科技有限公司 | Method for prolonging service life of refractory material at bottom of ferronickel electric furnace and bottom of ferronickel electric furnace |
| CN112981097B (en) * | 2021-02-07 | 2022-09-20 | 甘肃金麓银峰冶金科技有限公司 | Furnace wall and slag adhering method of water-cooling-wall-free nickel-iron ore thermoelectric furnace |
| CN115572172B (en) * | 2022-09-09 | 2023-06-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for utilizing waste graphite electrode and electric furnace |
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| CN101348845B (en) * | 2008-08-20 | 2010-07-28 | 攀钢集团钛业有限责任公司 | Method for smelting titanium slag with electric stove |
| CN101985697B (en) * | 2010-11-10 | 2012-07-18 | 攀钢集团钢铁钒钛股份有限公司 | Electric furnace charging process for high-titanium blast furnace slag carbonization |
| CN103820600B (en) * | 2014-03-05 | 2015-09-16 | 攀钢集团钛业有限责任公司 | The dross method of smelting titanium slag with electric stove |
| CN104087697B (en) * | 2014-07-04 | 2016-04-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Titanium slag electric furnace dross layer maintaining method |
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