CN101760579B - Fettling method for vanadium extracting converter - Google Patents
Fettling method for vanadium extracting converter Download PDFInfo
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- CN101760579B CN101760579B CN200810188165.0A CN200810188165A CN101760579B CN 101760579 B CN101760579 B CN 101760579B CN 200810188165 A CN200810188165 A CN 200810188165A CN 101760579 B CN101760579 B CN 101760579B
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Abstract
The invention provides a fettling method for a vanadium extracting converter. The method comprises the following steps: fettling a fettling material at the eroded part of the vanadium extracting converter in a buckling way; and then, carrying out the sintering process in which the fettling material is heated by the vanadium extracting converter and a coal-oxygen burner. The fettling method of the invention can reduce the fettling time, keep the converter in a good operating condition for a long time and reduce the frequency of production halt caused by the maintenance of the converter, thereby improving the production efficiency and reducing the cost.
Description
Technical field
The present invention relates to a kind of fettling method of converter extracting vanadium, relate more specifically to a kind of coaloust-oxygen gun that uses and carry out the method for fettling for converter extracting vanadium.
Background technology
Before steel-making, from the molten iron formed containing the melting of vanadium iron ore deposit, reclaim vanadium from the initial stage in 19th century.This process, generally not with slag former, is only blown into air and/or oxygen in molten iron, makes vanadium oxidation wherein generate V
2o
5enter slag phase together with the oxide compound of the element oxidizable with Si, the Ti in molten iron and Mn etc., obtain the vanadium slag that can be utilized, the molten iron after vanadium extraction is called as half steel.
In recent years, along with the steady growth in vanadium goods market, the output increasing vanadium goods becomes the effective measure improving steel mill's economic benefit.Use top and bottom combined blown converter in vanadium extraction, have good metallurgical effect, process for extracting vanadium both domestic and external is all to the future development adopting top and bottom complex blowing steel-making.Top and bottom complex blowing refining is also namely from converter top-blow oxygen, smelt from bottom-blowing of converter rare gas element the molten steel in converter.With stirring of inert gas vanadium slag and carbon containing half steel to strengthen the redox processes between them, thus the content of vanadium reduced in half steel and the iron oxide content in vanadium slag, correspondingly to improve the V in vanadium slag
2o
5content.
The key equipment of bottom blowing is the ventilated element (being commonly referred to gas permeable brick) of furnace bottom.Along with building the development with maintenance technology by laying bricks or stones, the furnace life theoretical value of converter extracting vanadium can reach more than 6000 stoves, but be subject to furnace high-temperature iron liquid, the strongly oxidizing slag (oxide compound (being called for short TFe) of iron, content is up to 25-35 % by weight) the impact of washing away and corroding, and due under bottom blowing gas pipeline is in the more severe condition such as high temperature, rapid heat cycle for a long time, gas permeable brick contacts with high-temperature molten steel for a long time, be easy to be severely eroded, shorten the work-ing life of gas permeable brick, cannot be synchronous with furnace life, even may there is leak accident.The work-ing life of the gas permeable brick in general converter extracting vanadium only has 2000-3000 stove, and so in intermediary and later stages stove labour, converter extracting vanadium is in the pure top blast state without bottom blowing, reduces V in vanadium slag
2o
5content and vanadium recovery, actually reduce the effective production time of converter.Therefore wish in process of production by effectively safeguarding converter air brick, to make the converter energy long period remain intact, higher production efficiency can be had.Normally, repair with regard to needs when the thickness that gas permeable brick is etched reaches 100-300 millimeter, otherwise, gas permeable brick can be caused to be etched too serious and cannot repair, even also can cause the accidents such as runout.
Usually, due to the erosion of slag and metal liquid, air-flow wash away and the reason such as operation causes vanadium extraction by converter blowing to produce the speed of deteriorating of the top and bottom combined blown converter used and degree is uneven, that is along with the carrying out produced, in converter, a part keeps good state another part then serious damage.Therefore also need to repair converter in the process of vanadium extraction production, such as, repair converter boiler face or gas permeable brick etc., under ensureing that converter can remain on good operating state as far as possible for a long time, improve the turnout in Converter labour.Due to vanadium extraction produce in slag in containing a large amount of vanadium, therefore can not adopt and spatter slag method the part be etched in converter is repaired.The method of therefore mending through conventional button is at present safeguarded the boiler face of converter extracting vanadium and gas permeable brick.Specifically, for the top and bottom combined blown converter of 120 tons conventional at present, when adopting button reinforcing method to safeguard that the step of gas permeable brick to be included in converter without molten steel and slag, pour the special air-permeable material for repairing furnace of 1-2.5 ton into converter after the airshed of bottom blowing rare gas element being transferred to 0-50 standard cube m/h, the converter that rocks back and forth allows air-permeable material for repairing furnace cover gas permeable brick and converter is rested on zero-bit after filling up attack sites and sinters.This special air-permeable material for repairing furnace main component comprises magnesium oxide and silicon-dioxide, and the volume density at 110 DEG C in 24 hours is not more than 2.6 grams/cc; Compressive strength in 3 hours, is more than or equal to 10 MPas at 1000 DEG C, and is more than or equal to 25 MPas at 1500 DEG C; At 1500 DEG C, in 3 hours, the linear change rate of density fireproof cast stockline is-2.5% to 0, and solidification value is 800-1100 DEG C.Adopt button reinforcing method to safeguard that the step of boiler face then comprises, time in converter without molten steel and slag, use the feed supplement of boiler face button to carry out button to the boiler face of converter and mend, then the feed supplement of boiler face button is sintered.Described Converter face comprises steel wing furnace face of converting (the front large face of also i.e. converter) and tapping wing furnace face (the rear large face of also i.e. converter).Containing magnesium oxide, simple substance carbon and auxiliary agent in the feed supplement of described boiler face button.For the top and bottom combined blown converter of 120 tons conventional at present, the consumption of button feed supplement is generally 1-3 ton.
But in current maintaining converter method, boiler face and furnace bottom carry out detaining the sintering after mending needs the long period, and the repairing only carrying out each just probably needs 60-90 minute, and in vanadium extraction is produced, the production intermittent time of every stove is generally no more than 60 minutes.Therefore, existing vanadium extraction by converter blowing all needs stopping production to repair the furnace bottom of converter or boiler face after often producing certain hour.Consider and enhance productivity, will reduce the time of stopping production and the number of times of stopping production as far as possible, that is each stopping production is all the severity be etched according to converter, and only serious to converter erosion degree part is repaired.In addition, the filling mending material used at present can only keep the production of 5-12 stove, and also need again to carry out buckleing benefit to converter after mending material has been corroded again, this needs to take the more production time undoubtedly, must delay rhythm of production.
As can be seen here, in the vanadium extraction production of prior art, the method safeguarded the gas permeable brick of converter boiler face and furnace bottom also exists and will ensure that rhythm of production just can not be safeguarded converter attack sites in time, corrode the contradiction seriously causing bottom blowing deficiency to reduce production efficiency at converter later stage gas permeable brick, be unfavorable for the further raising of the efficiency that vanadium extraction is produced and converter lining life.Therefore, in traditional vanadium extraction production, the life-span of converter cannot keep longer, and cannot take into account simultaneously converter safeguarded in time thus converter is kept the good operation state of longer time, can reduce as far as possible simultaneously and need the time that converter is safeguarded that stops production, thus there is the problem compared with high efficiency.
Summary of the invention
The object of the invention is to overcome in prior art and cannot reduce the time stopping production and converter is safeguarded while making converter keep the good operation state of long period, and cause the off-time long, the shortcoming that production efficiency is low, a kind of good operation state that converter can be made to keep the long period is provided, and the number of times stopped production in order to safeguard converter is less, thus there is the fettling method of the converter extracting vanadium of higher production efficiency.
The invention provides a kind of fettling method of converter extracting vanadium, wherein, the method comprise mending material buckled mend converter extracting vanadium be etched position, then sinter, in the process of sintering, use converter extracting vanadium and coaloust-oxygen gun to heat this mending material.
Fettling method of the present invention can shorten the filling time, makes converter keep the good operation state of long period, decreases the number of times stopped production owing to keeping in repair converter, thus improve production efficiency, reduce cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of the coaloust-oxygen gun that the embodiment of the present invention uses.
Embodiment
The fettling method of converter extracting vanadium provided by the invention comprise mending material buckled mend converter extracting vanadium be etched position, then sinter, in the process of sintering, use converter extracting vanadium and coaloust-oxygen gun to heat this mending material.
Wherein, described converter extracting vanadium comprises boiler face and gas permeable brick.Consider and reduce each stopping production the time of carrying out repairing as far as possible, enhance productivity, can repair the boiler face of converter and gas permeable brick simultaneously.Due to generally, the area being etched position being etched the area ratio gas permeable brick at position of boiler face is much bigger, makes the amount ratio of the mending material for repairing boiler face much bigger for the consumption of the furnace charge repairing gas permeable brick.Therefore when to repair boiler face and gas permeable brick simultaneously, if only sintered with converter extracting vanadium conducting self-heating, the sintering time required for the mending material of boiler face and gas permeable brick is different.Therefore, when to repair boiler face and gas permeable brick simultaneously, what the method comprised boiler face that to be buckled by mending material and mend converter extracting vanadium and gas permeable brick is etched position, is then sintered by converter extracting vanadium heating, in the process of sintering, also uses the mending material of coaloust-oxygen gun to boiler face to heat.The boiler face of described converter extracting vanadium comprises converts steel side and tapping side.
According to fettling method provided by the invention, wherein, the Heating temperature of described coaloust-oxygen gun can be 1000-1800 DEG C, be preferably 1200-1600 DEG C, the Heating temperature of described converter extracting vanadium can be 700-1100 DEG C, be preferably 800-1000 DEG C, the time of sintering can be 25-70 minute, is preferably 40-60 minute.
Described coaloust-oxygen gun can be existing any coaloust-oxygen gun that can provide the mixed gas of oxygen and coal gas.In order to sinter mending material better, the gas flow of described coaloust-oxygen gun can be 80-300 cube m/h, and be preferably 100-200 cube m/h, oxygen flow can be 50-200 cube m/h, is preferably 80-120 cube m/h.
Wherein, gas flow and the oxygen flow of coaloust-oxygen gun can be controlled by the pressure and conduit caliber controlling coal gas and oxygen.Such as, making the gas flow of coaloust-oxygen gun be the method for 80-300 cube m/h can be 0.3-0.8 MPa for controlling the pressure of coal gas, and the caliber of gas conduit is 20-50 millimeter; Making the oxygen flow of coaloust-oxygen gun be the method for 50-200 cube m/h can be 0.5-1.0 MPa for controlling the pressure of oxygen, and the caliber of oxygen catheter is 10-20 millimeter.
According to fettling method provided by the invention, wherein, described coal gas can be coke-oven gas and/or blast furnace gas, is preferably coke-oven gas.The composition of described coke-oven gas and blast furnace gas and be purchased producer and the trade mark is conventionally known to one of skill in the art.
According to fettling method provided by the invention, wherein, described mending material can comprise boiler face mending material and air-permeable material for repairing furnace.Under preferable case, when converter to be etched position be boiler face time, use boiler face mending material, when converter to be etched position be gas permeable brick time, use air-permeable material for repairing furnace.But boiler face mending material also may be used for buckleing mends gas permeable brick, and air-permeable material for repairing furnace also may be used for detaining fettling face.
Described boiler face mending material can be the mending material of various repairing converter boiler face known in the field.Such as, described boiler face mending material contains magnesium oxide, simple substance carbon and auxiliary agent, be as the criterion with the gross weight of this boiler face mending material, described magnesian content can be 65-90 % by weight, the content of described simple substance carbon can be 6-16 % by weight, the content of described auxiliary agent can be 4-20 % by weight, and described auxiliary agent is one or more in calcium oxide, silica flour and resin.
Under preferable case, the solidification value of described boiler face mending material is 700-1100 DEG C, is not less than particle dia≤10 millimeter of the solid particulate of 80% in described boiler face mending material.
The boiler face mending material meeting above-mentioned condition can be commercially available, and can be such as the large face mending material purchased from Shenyang Dong Mei refractory materials Manufacturing Co., Ltd, the trade mark be BL, wherein containing the magnesium oxide being not less than 80 % by weight, is not less than the simple substance carbon of 5 % by weight; Also can be that this mending material is mainly containing magnesium oxide and simple substance carbon, and magnesian content is more than 70 % by weight, and the content of simple substance carbon is more than 8 % by weight purchased from Flos Bombacis Malabarici along the KS type mending material of rising the production of industry metallurgical material company limited of group.
Described air-permeable material for repairing furnace can be the mending material of various repairing converter bottom gas permeable brick known in the field.Such as, air-permeable material for repairing furnace can containing refractory materials and additive, and be as the criterion with the gross weight of described air-permeable material for repairing furnace, the content of described refractory materials can be 70-95 % by weight, and the content of described additive can be 5-30 % by weight
Under preferable case, the refractoriness of described refractory materials is not less than 1670 DEG C, and in described air-permeable material for repairing furnace, the particle dia of solid particulate is not more than 4 millimeters, and the volume density at 110 DEG C in 24 hours is not more than 2.6 grams/cc; Compressive strength in 3 hours, is more than or equal to 10 MPas at 1000 DEG C, and is more than or equal to 25 MPas at 1500 DEG C; At 1500 DEG C, in 3 hours, the linear change rate of density fireproof cast stockline is-2.5% to 0, and the solidification value of described air-permeable material for repairing furnace is 800-1000 DEG C.
Wherein, described refractory materials can contain magnesium oxide and coke fines, and with the gross weight of described refractory materials for benchmark, described magnesian content can be 75-90 % by weight, and the content of described coke fines can be 10-25 % by weight.Wherein, described additive can comprise one or more in the phosphoric acid salt of sodium, the silicate of sodium, the vitriol of sodium, clay, resin, pitch.
The air-permeable material for repairing furnace meeting above-mentioned condition can be commercially available, such as, can be the converter extracting vanadium material for repairing air brick that special refractories limited liability company of Wuhan RISESUN produces.
The fettling method of converter extracting vanadium of the present invention comprises to be repaired according to the degree that is etched of the boiler face of converter and the gas permeable brick of converter, under normal circumstances, often carry out the vanadium extraction of 20-40 stove just to need to repair the boiler face of converter and/or gas permeable brick, such as can from produce 20-40 stove, such as the 25th stove, stops production and to repair the boiler face of converter, then after repairing from this time, the 20-40 stove of starting at produced by the first stove, such as the 36th stove, stop production the repairing carrying out again to the boiler face of converter; 20-40 stove from initial production, such as the 30th stove, stop production and to repair the furnace bottom gas permeable brick of converter, then after repairing from this time, the first stove produces the 20-40 stove of starting at, such as the 20th stove, to the repairing that the gas permeable brick of converter carries out again.Under preferable case, in order to reduce each stopping production the time of carrying out repairing as far as possible, enhancing productivity, can carry out the boiler face repairing of converter and the repairing air brick to converter simultaneously, such as, often carry out 30 stove vanadium extractions to repair the boiler face of converter and gas permeable brick simultaneously.
When repairing, the consumption of mending material described mending material can be made to be filled in 50-100 volume % that described boiler face and/or gas permeable brick are etched position.For the top and bottom combined blown converter of 120 tons conventional at present, the consumption of described mending material can be 0.5-5 ton, is preferably 1-3 ton, wherein, can be 1-4 ton, being preferably 1-2 ton for repairing the consumption with mending material of the mending material of boiler face; Consumption for the mending material repairing ventilative turn can be 0.5-2 ton, is preferably 0.5-1 ton.
Because Bottom Blowing flow may blow away mending material when repairing converter, be unfavorable for that mending material is stablized, be filled in the position be etched in converter securely, simultaneously from the angle of save energy, according to method of the present invention, also be included in before button benefit is carried out to converter, such as to gas permeable brick carry out detain mend before and/or to converter convert steel side and/or tapping side carry out button benefit before, Bottom Blowing flow is adjusted to 0-20 cube m/h, is preferably adjusted to 0-10 cube m/h.
Below in conjunction with embodiment, the present invention will be described in more detail.
Embodiment 1
The present embodiment is for illustration of the fettling method of converter extracting vanadium provided by the invention.
(1), after using 120 tons of converter extracting vanadiums of Flos Bombacis Malabarici Xin Gang vanadium company steelworks often to carry out 30 stove vanadium extractions productions, bottom blowing stream of nitrogen gas amount is adjusted to 10 cubes ms/h.The KS type mending material of 1 ton of Panzhihua Shunteng Group Metallurgical Materials Co., Ltd.'s manufacturer production is poured in converter, then the converter that rocks back and forth allows air-permeable material for repairing furnace cover gas permeable brick place, fill up the pit of erosion, afterwards converter is rested on zero-bit (fire door vertical up position) and sinter 30 seconds (sintering temperature is 1000 DEG C).
(2) and then in converter, pour the KS type mending material of 2.5 tons of Panzhihua Shunteng Group Metallurgical Materials Co., Ltd.'s manufacturer production into, converter is shaken 90 ° of positions to stokehold and stop.Coaloust-oxygen gun is stretched in stove, turn on the gas-fire and the valve of oxygen, the flow of coal gas is made to be 120 cubes ms/h, the flow of oxygen is 80 cubes ms/h, the mixed gas in coaloust-oxygen gun exit is lighted, while sintering, the mending material of boiler face is heated 60 minutes (sintering temperature is 1000 DEG C).Finally bottom blowing stream of nitrogen gas amount is recalled to 160 cubes ms/h, proceed vanadium extraction and produce.
Carry out vanadium extraction in a year according to such maintaining method to produce.
Wherein, as shown in Figure 1,1 is gas entry to the structure of the coaloust-oxygen gun of use, 2 is oxygen intake, and 3 is the outlet of the mixed gas of coal gas and oxygen, and the caliber of gas conduit is 35 millimeters, pressure is 0.5 MPa, and the caliber of oxygen catheter is 15 millimeters, and pressure is 0.7 MPa.
Embodiment 2
The present embodiment is for illustration of the fettling method of converter extracting vanadium provided by the invention.
(1), after using 120 tons of converter extracting vanadiums of Flos Bombacis Malabarici Xin Gang vanadium company steelworks often to carry out 25 stove vanadium extractions productions, bottom blowing stream of nitrogen gas amount is adjusted to 8 cubes ms/h.The converter extracting vanadium material for repairing air brick that 1.5 tons of special refractories limited liability companys of Wuhan RISESUN produce is poured in converter, then the converter that rocks back and forth allows air-permeable material for repairing furnace cover gas permeable brick place, fill up the pit of erosion, afterwards converter is rested on zero-bit (fire door vertical up position) and sinter 35 minutes (sintering temperature is 1100 DEG C).Finally bottom blowing stream of nitrogen gas amount is recalled to 160 cubes ms/h, proceed vanadium extraction and produce.
(2) after often carrying out 30 stove vanadium extractions productions, in converter, pour the KS type mending material of 3 tons of Panzhihua Shunteng Group Metallurgical Materials Co., Ltd.'s manufacturer production into, converter is shaken 90 ° of positions to stokehold and stop.Coaloust-oxygen gun is stretched in stove, turn on the gas-fire and the valve of oxygen, the flow of coal gas is made to be 180 cubes ms/h, the flow of oxygen is 120 cubes ms/h, the mixed gas in coaloust-oxygen gun exit is lighted, while sintering, the mending material of boiler face is heated 35 minutes (sintering temperature is 1100 DEG C).Then proceed vanadium extraction to produce.
Carry out vanadium extraction in a year according to such maintaining method to produce.
Wherein, the structure of the coaloust-oxygen gun of use is with embodiment 1.
Comparative example 1
This comparative example is for illustration of the fettling method of existing converter extracting vanadium.
The maintenance of converter is carried out according to the method for embodiment 1, unlike: in the process of repairing boiler face, do not use coaloust-oxygen gun to heat, the time of sintering is 90 minutes.
Carry out vanadium extraction in a year according to such maintaining method to produce.
Table 1 lists the vanadium extraction condition of production of embodiment and comparative example.Wherein, vanadium extraction operating rate=tap to tap time ÷ (tap to tap time+off-time) × 100%; Vanadium extraction stove number is the stove number of two average productions every day of converter extracting vanadium; Vanadium slag output is two converter extracting vanadiums vanadium slag output of a year.
Table 1
| Average filling time/point | Vanadium extraction operating rate/% | Vanadium extraction stove number | Vanadium slag output/ten thousand ton | |
| Embodiment 1 | 50 | 78.3 | 100.1 | 20.5 |
| Embodiment 2 | 70 | 75.1 | 98.6 | 19.8 |
| Comparative example 1 | 90 | 71.9 | 95.8 | 18.2 |
Data as can be seen from table 1, fettling method of the present invention can shorten the filling time, decreases the number of times stopped production owing to keeping in repair converter, thus improves vanadium extraction operating rate, vanadium extraction stove number and vanadium slag output, then reduces cost.
Claims (11)
1. the fettling method of a converter extracting vanadium, the method comprise mending material buckled mend converter extracting vanadium be etched position, then sinter, in the process of sintering, use converter extracting vanadium and coaloust-oxygen gun to heat this mending material, it is characterized in that, the Heating temperature of described coaloust-oxygen gun is 1000-1800 DEG C, and the Heating temperature of described converter extracting vanadium is 700-1100 DEG C, and the time of sintering is 25-70 minute.
2. method according to claim 1, wherein, described converter extracting vanadium comprises boiler face and gas permeable brick, what the method comprised boiler face that to be buckled by mending material and mend converter extracting vanadium and gas permeable brick is etched position, then sinter, in the process of sintering, use converter extracting vanadium and the mending material of coaloust-oxygen gun to boiler face to heat.
3. method according to claim 1 and 2, wherein, the Heating temperature of described coaloust-oxygen gun is 1200-1600 DEG C, and the Heating temperature of described converter extracting vanadium is 800-1000 DEG C, and the time of sintering is 40-60 minute.
4. method according to claim 1 and 2, wherein, the gas flow of described coaloust-oxygen gun is 80-300 cube m/h, and oxygen flow is 50-200 cube m/h.
5. method according to claim 4, wherein, make the gas flow of coaloust-oxygen gun be the method for 80-300 cube m/h to be the pressure controlling coal gas to be 0.3-0.8 MPa, the caliber of gas conduit is 20-50 millimeter; Make the oxygen flow of coaloust-oxygen gun be the method for 50-200 cube m/h to be the pressure controlling oxygen to be 0.5-1.0 MPa, the caliber of oxygen catheter is 10-20 millimeter.
6. method according to claim 4, wherein, described coal gas is coke-oven gas and/or blast furnace gas.
7. method according to claim 1, wherein, described mending material comprises boiler face mending material and air-permeable material for repairing furnace, and what button mended that the boiler face of converter is etched position is boiler face mending material, and what button mended that the gas permeable brick of converter is etched position is air-permeable material for repairing furnace.
8. method according to claim 7, wherein, described boiler face mending material contains magnesium oxide, simple substance carbon and auxiliary agent, be as the criterion with the gross weight of this boiler face mending material, described magnesian content is 65-90 % by weight, the content of described simple substance carbon is 6-16 % by weight, the content of described auxiliary agent is 4-20 % by weight, described auxiliary agent is calcium oxide, one or more in silica flour and resin, the solidification value of described boiler face mending material is 800-1000 DEG C, refractoriness is not less than 1670 DEG C, in described boiler face mending material more than 80 % by weight particle dia≤10 millimeter of solid particulate.
9. method according to claim 7, wherein, described air-permeable material for repairing furnace contains refractory materials and additive, be as the criterion with the gross weight of described air-permeable material for repairing furnace, the content of described refractory materials is 70-95 % by weight, the content of described additive is 5-30 % by weight, and the refractoriness of described refractory materials is not less than 1670 DEG C, in described air-permeable material for repairing furnace, the particle dia of solid particulate is not more than 4 millimeters, the solidification value of described air-permeable material for repairing furnace is 800-1000 DEG C, wherein, described refractory materials contains magnesium oxide and coke fines, with described refractory materials gross weight for benchmark, described magnesian content is 75-90 % by weight, the content of described coke fines is 10-25 % by weight, described additive comprises the phosphoric acid salt of sodium, the silicate of sodium, the vitriol of sodium, clay, resin, one or more in pitch.
10. method according to claim 1 and 2, wherein, the consumption of described mending material described mending material is filled in 50-100 volume % that described converter extracting vanadium is etched position.
11. methods according to claim 10, wherein, the consumption of described mending material is 0.5-5 ton.
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| CN200810188165.0A CN101760579B (en) | 2008-12-24 | 2008-12-24 | Fettling method for vanadium extracting converter |
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| CN102586602B (en) * | 2012-02-24 | 2014-01-22 | 河北钢铁股份有限公司承德分公司 | Method for evenly prolonging service life of electric furnace used for smelting ferrovanadium by electro-silicothermic process |
| CN107119169A (en) * | 2017-04-28 | 2017-09-01 | 邢台钢铁有限责任公司 | A kind of method of AOD furnace clinker furnace retaining |
| CN109870033B (en) * | 2019-03-15 | 2019-12-31 | 黄河科技学院 | Manual brick raking machine |
| CN112341219B (en) * | 2020-11-06 | 2022-05-10 | 鞍山市和丰耐火材料有限公司 | Environment-friendly converter fettling sand taking schreyerite as sintering agent and production method thereof |
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| CN1197119A (en) * | 1997-04-18 | 1998-10-28 | 武汉瑞升技术研究所 | Modifying material for converter final slag and its prodn. tech. |
| CN1417549A (en) * | 2001-11-06 | 2003-05-14 | 武汉威林炉衬材料有限责任公司 | Large-area self-flowing converter repairing material |
| CN101319257A (en) * | 2008-07-03 | 2008-12-10 | 攀钢集团研究院有限公司 | Bottom blowing ventilating structure of combined-blowing revolving furnace |
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