CN103981322A - Top-bottom combined blowing converter vanadium extraction method - Google Patents
Top-bottom combined blowing converter vanadium extraction method Download PDFInfo
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Abstract
The invention discloses a top-bottom combined blowing converter vanadium extraction method. The method comprises the following steps: adding vanadium-containing molten iron and a coolant into a top-bottom combined blowing converter; and carrying out oxygen-supply blowing and bottom blowing, wherein nitrogen is employed in bottom blowing, and mixed gas of oxygen and carbon dioxide is employed in oxygen-supply blowing. The method provided by the invention has a vanadium oxidation rate of higher than 90% and a carbon oxidation rate of lower than 13% without addition of a great amount of the coolant.
Description
Technical field
The present invention relates to a kind of method of top and bottom combined blown converter vanadium extraction.
Background technology
China is vanadium titano-magnetite big country, and high by molten iron its content of vanadium compared with common molten iron of smelting vanadium-titanium magnetite by blast furnace gained, therefore must vanadium extraction before molten iron-steelmaking to produce vanadium slag, be the general way of acquisition vanadium resource.At present, the method for producing vanadium slag is both at home and abroad more, mainly contains New Zealand's hot metal ladle and blows vanadium technique, South Africa shaking ladle process for extracting vanadium, Russia and Chinese vanadium extraction by converter blowing technique etc., also comprises in addition v-bearing steel slag vanadium extraction, process for extracting vanadium from stone coal etc.Wherein with vanadium extraction by converter blowing technique optimum, economical.
Conventionally come constantly vanadium extraction by converter blowing technique to be improved by regulation and control refrigerant, process temperature and duration of blast.Wherein, because vanadium extraction from hot metal is a selective oxidation technology.In oxygen supply converting process, the element oxidations such as [Si], [Mn], [V], [C] are rapidly heated molten bath, and before [Si], [Mn] oxidation occurs in [V] oxidation, its oxidation is difficult to suppress, and the invert point of the oxidation of [C], [V] is 1385 DEG C of left and right, lower than this temperature, vanadium has precedence over oxidation of coal, higher than this temperature, carbon has precedence over vanadium oxidation, therefore will obtain high oxidation rate and the high yield of [V], must add vanadium-raising cooling agent, control bath temperature and make it to approach [C], [V] invert point, reach the object of vanadium extraction guarantor carbon.So adopting adds the mode of refrigerant to make molten iron temperature drop to suitable scope.
CN1789435A discloses a kind of vanadium extraction from hot metal control calcium refrigerant and vanadium extraction from hot metal control calcium technique, the chemical composition (Wt%) of its vanadium-raising cooling agent is: iron scale 56-60%, fine iron breeze 30-40%, bonding agent 5-10%, this refrigerant can increase extraction yield and the v slag grade of vanadium, stablize vanadium slag calcium oxide content, but the consumption of its refrigerant is at 60-90kg/t
molten steel, it still needs higher refrigerant consumption to control temperature as seen.
Summary of the invention
The object of the invention is to overcome the high defect of refrigerant consumption in existing vanadium extraction by converter blowing, the method for the top and bottom combined blown converter vanadium extraction that a kind of refrigerant consumption oxidation ratio few and vanadium is high is provided.
The present inventor furthers investigate discovery, in top and bottom combined blown converter vanadium extracting process, the mode that adopts the mixed gas of oxygen and carbonic acid gas to carry out oxygen supply blowing, can reduce the oxidation of coal rate of molten iron greatly, improve the oxidation ratio of vanadium, and without adding a large amount of refrigerants to lower the temperature.
Thus, the invention provides a kind of method of top and bottom combined blown converter vanadium extraction, the method comprises: vanadium-bearing hot metal and refrigerant are joined in converter, and carry out oxygen supply blowing and bottom blowing, what described bottom blowing adopted is nitrogen, and wherein, what described oxygen supply blowing adopted is the mixed gas of oxygen and carbonic acid gas.
Adopt the method for vanadium extraction by converter blowing of the present invention, can be not adding under the condition of a large amount of refrigerants, after finishing blowing, the vanadium oxidation ratio of described vanadium-bearing hot metal higher than 90% and oxidation of coal rate lower than 13%.
Other features and advantages of the present invention are described in detail the embodiment part subsequently.
Embodiment
Below the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
In the present invention, vanadium oxidation ratio refers to that content of vanadium in the half steel after content of vanadium and the vanadium extraction in the vanadium-bearing hot metal before vanadium extraction subtracts each other the weight percent of the content of vanadium in the vanadium-bearing hot metal before difference and the vanadium extraction of gained.
In the present invention, oxidation of coal rate refers to that carbon content in the half steel after carbon content and the vanadium extraction in the vanadium-bearing hot metal before vanadium extraction subtracts each other the weight percent of the carbon content in the vanadium-bearing hot metal before difference and the vanadium extraction of gained.
Here " half steel " can refer to the product that vanadium-bearing hot metal obtains after the method vanadium extraction of vanadium extraction by converter blowing of the present invention, and its carbon content is between molten iron and molten steel.
The invention provides a kind of method of top and bottom combined blown converter vanadium extraction, the method comprises: vanadium-bearing hot metal and refrigerant are joined in converter, and carry out oxygen supply blowing and bottom blowing, what described bottom blowing adopted is nitrogen, what wherein, described oxygen supply blowing adopted is the mixed gas of oxygen and carbonic acid gas.
Blowing in the present invention refers to from oxygen supply blowing and starts to provide the mixed gas of oxygen and carbon dioxide to carry out oxygen supply to stopping providing gas no longer to carry out the process of oxygen supply to oxygen supply blowing.
According to the present invention, described vanadium-bearing hot metal can be the molten iron containing the melting of vanadium iron ore deposit of this area routine, the molten iron for example being obtained after blast-furnace smelting by vanadium titano-magnetite.Because the method for vanadium extraction by converter blowing of the present invention can obtain higher vanadium oxidation ratio and lower oxidation of coal rate, therefore, can be for the vanadium extraction processing of the lower vanadium-bearing hot metal of content of vanadium, the content of the vanadium of for example described vanadium-bearing hot metal is 0.2-0.35 % by weight, is preferably 0.25-0.32 % by weight; The content of carbon is 4-5 % by weight, is preferably 4.2-4.8 % by weight; The content of silicon is 0.1-0.3 % by weight, is preferably 0.15-0.25 % by weight; The content of manganese is 0.15-0.5 % by weight, is preferably 0.18-0.31 % by weight; The content of iron is more than 93 % by weight, is preferably 94-97 % by weight.Can also reduce the thermosteresis of vanadium extracting process in the processing of the vanadium-bearing hot metal of above-mentioned scope.In described vanadium-bearing hot metal, also may contain a small amount of sulphur, phosphorus, titanium etc., the content of for example sulphur is 0.055-0.1 % by weight, and the content of phosphorus is 0.06-0.08 % by weight, and the content of titanium is 0.1-0.35 % by weight, and these impurity elements are little on the impact of vanadium extraction.The temperature of described vanadium-bearing hot metal can be the temperature of the handled vanadium-bearing hot metal of vanadium extraction by converter blowing of this area routine, and preferably, the temperature of described vanadium-bearing hot metal is controlled near the temperature of carbon-vanadium oxidation conversion point, for example 1200-1320 DEG C.
According to the present invention, described vanadium-bearing hot metal is joined in converter and blown, in order to control better the temperature of molten iron in the stove in converting process, need in converter, add refrigerant.Described refrigerant can add in section any time before oxygen supply blowing and/or in oxygen supply converting process.Although in the present invention to there not being any restriction adding of described refrigerant opportunity, but owing to adopting method of the present invention can be controlled at better the oxidation of the carbon in oxygen supply converting process and avoid the problem of the high temperature causing because of its oxidation, therefore, in order to simplify the operation, after the present invention is preferably starting to carry out oxygen supply blowing after described vanadium-bearing hot metal joins in converter, 0.5-1.5min adds described refrigerant.And, although the consumption of described refrigerant can be the consumption of this area routine, but in the present invention, adopt the refrigerant of less amount just can after oxygen supply finishing blowing, obtain the molten iron that oxidation of coal rate is low and vanadium oxidation ratio is high, therefore, for the reason reducing costs, preferably, the consumption of described refrigerant is 15-25kg/t
molten iron, more preferably 16-19kg/t
molten iron.
Described refrigerant can be the refrigerant of this area routine, such as, in pig, steel scrap, useless vanadium slag, iron sheet ball, sludge ball, iron ore, agglomerate, pellet etc. one or more, are preferably one or more in pig, iron sheet ball, sludge ball, pellet.
Described pig, steel scrap, useless vanadium slag, iron sheet ball, sludge ball, iron ore, agglomerate, pellet can be the selection of this area routine separately, and for example described pig refers to the iron block of vanadium-bearing hot metal casting, and its composition is consistent with vanadium-bearing hot metal; Described useless vanadium slag refers to the solid particulate of vanadium slag after fragmentation screening, the iron that it contains 40-50 % by weight; Described sludge ball refers to that the dirt ash that converter extracting vanadium is removed obtains through pelletizing, the TFe that it contains 60-65 % by weight, the SiO of 5-10 % by weight
2, the MnO of 5-10 % by weight, is less than the CaO of 5 % by weight; Described iron ore refers to containing vanadium titanium raw ore; Described agglomerate refers to the agglomerate of producing containing vanadium iron concentrate for blast furnace; Described pellet refers to the pelletizing of producing containing vanadium iron concentrate.
According to one of the present invention preferred embodiment, the pig that consists of 10-20 % by weight of described refrigerant and the iron sheet ball of 80-90 % by weight.
According to another preferred embodiment of the present invention, the pellet that consists of 20-30 % by weight of described refrigerant and the iron sheet ball of 70-80 % by weight.
According to another preferred embodiment of the present invention, described refrigerant is iron sheet ball.
According to another preferred embodiment of the present invention, the pig that consists of 5-10 % by weight of described refrigerant, the iron sheet ball of 70-80 % by weight, the pellet of 10-15 % by weight.
According to the method for top and bottom combined blown converter vanadium extraction of the present invention, wherein, the top blast of top and bottom complex blowing refers to that the mixed gas of jet above converter oxygen and carbonic acid gas carries out oxygen supply blowing.In the present invention, as long as oxygen supply blowing employing is the mixed gas of oxygen and carbonic acid gas, can realize after oxygen supply finishing blowing the effect that vanadium oxidation ratio is higher and oxidation of coal rate is lower of described vanadium-bearing hot metal.Preferably, in the oxygen that described oxygen supply blowing adopts and the mixed gas of carbonic acid gas, the volume ratio of oxygen and carbonic acid gas is (3-8): 1, more preferably (3-5): 1, further be preferably (3-4.5): 1, most preferably be (3.5-4.5): 1, described volume ratio be the volume ratio that standard atmosphere is depressed.
In the present invention, what described oxygen supply blowing adopted is the mixed gas of oxygen and carbonic acid gas, both can realize the oxidation to metals such as the vanadium in molten iron in conventional oxygen supply blowing, can suppress to a greater extent again the oxidation of carbon in molten iron, realize the object of vanadium extraction guarantor carbon.Therefore, in the present invention, the condition of oxygen supply blowing be there is no to special restriction, can adjust according to the composition of concrete vanadium-bearing hot metal to be dealt with.Preferably, the winding-up intensity of described mixed gas is 2-6m
3/ (mint
molten iron).More preferably, the winding-up intensity of described mixed gas is 2.5-4m
3/ (mint
molten iron).Still more preferably, the winding-up intensity of described mixed gas is 3-3.5m
3/ (mint
molten iron).Preferably, the time of described oxygen supply blowing is 4-8min, more preferably 5-7min.
The winding-up of the mixed gas to oxygen and carbonic acid gas in the present invention can adopt oxygen rifle to carry out, the mapping mode of the rifle position of the oxygen rifle adopting in described oxygen supply converting process can adopt this area routine in the vanadium extraction by converter blowing process oxygen lance position in oxygen supply when blowing, for example, in the process of described oxygen supply blowing, the oxygen rifle of oxygen supply starts to adopt high rifle position in oxygen supply blowing, adopt low rifle position mid-term in oxygen supply blowing, before oxygen supply finishing blowing, adopt high rifle position.High rifle position in the present invention refers in same process and adopts higher rifle position, low rifle position mid-term than oxygen supply blowing, and high rifle position herein does not have other limiting meanings.Preferably, in described oxygen supply converting process, adopt the jet mixed gas of oxygen and carbonic acid gas of oxygen rifle, described oxygen rifle adopts the rifle position of 1.8-2m in the time that oxygen supply blowing starts 0.5-1.5min, the rifle position that adopts 1.5-1.7m in oxygen supply blowing mid-term, before oxygen supply finishing blowing, 1-1.5min adopts the rifle position of 1.8-2m; Preferably, described oxygen rifle adopts the rifle position of 1.85-1.95m in the time that oxygen supply blowing starts 0.5-1.5min, adopts the rifle position of 1.55-1.65m in oxygen supply blowing mid-term, and before oxygen supply finishing blowing, 1-1.5min adopts the rifle position of 1.85-1.95m.Oxygen lance position adopts such " high-low-high " pattern, can reach and reduce vanadium slag iron level, raising vanadium oxidation ratio texts.Wherein, the height of the nozzle distance molten bath face (minimum level of molten iron) of oxygen rifle is called as rifle position.
According to the present invention, wherein, what the bottom blowing of top and bottom complex blowing adopted is nitrogen.Described bottom blowing is to adopt nitrogen the materials such as the vanadium-bearing hot metal in converter to be jetted to lower and upper by converter bottom gas permeable brick.
According to the present invention, described bottom blowing is preferably included between the oxygen supply blowing process and between the non-oxygen supply blowing process and adopts nitrogen to jet.Between the described non-oxygen supply blowing process, refer to oxygen supply blowing start before or oxygen supply blowing start after front and oxygen supply finishing blowing, if particularly need to carry out vanadium extraction by converter blowing continuously, bottom blowing nitrogen can also be carried out after oxygen supply finishing blowing, to carry out the vanadium extraction of next stove.Bottom blowing in the present invention adopts nitrogen to jet, the effect of the melting bath stirring that can be strengthened, thus can reach the object that promotes reaction to carry out and reduce the full Fe content of vanadium slag.Therefore, the winding-up intensity to the nitrogen in bottom blowing in the present invention is not particularly limited, as long as can realize above-mentioned purpose, preferably, the winding-up intensity of the nitrogen adopting between the oxygen supply blowing process is 0.1-0.5m
3/ (mint
molten iron), be preferably 0.3-0.4m
3/ (mint
molten iron); The winding-up intensity of the nitrogen adopting between the non-oxygen supply blowing process is 0.0005-0.0015m
3/ (mint
molten iron), be preferably 0.001-0.0015m
3/ (mint
molten iron).
Adopt the method for top and bottom combined blown converter vanadium extraction of the present invention, temperature can be controlled at preferably to carbon-vanadium oxidation conversion point, preferably, the temperature of the terminal molten iron of described oxygen supply blowing is controlled at 1350-1380 DEG C.
According to aforesaid method, can be in the time of oxygen supply finishing blowing, the vanadium oxidation ratio of described vanadium-bearing hot metal is more than 90%, and oxidation of coal rate is below 13%.
Below will describe the present invention by embodiment.
In following examples and comparative example:
The measuring method of vanadium oxidation ratio is: get respectively the half steel sample after vanadium-bearing hot metal sample and the vanadium extraction before vanadium extraction, and adopt N-benzoylphenylhydroxyamine (N-BPHA) light-intensity method to detect content of vanadium wherein, content of vanadium in the half steel after the content of vanadium in the vanadium-bearing hot metal before vanadium extraction and vanadium extraction is subtracted each other to the weight percent of the content of vanadium in the vanadium-bearing hot metal before difference and the vanadium extraction of gained;
The measuring method of oxidation of coal rate is: get respectively the half steel sample after vanadium-bearing hot metal sample and the vanadium extraction before vanadium extraction, and adopt combustion gases volumetry of recording in " mensuration-combustion gases volumetry of CSM07030602-2003 steel alloy-carbon content " to detect carbon content wherein, carbon content in the half steel after the carbon content in the vanadium-bearing hot metal before vanadium extraction and vanadium extraction is subtracted each other to the weight percent of the carbon content in the vanadium-bearing hot metal before difference and the vanadium extraction of gained.
Embodiment 1
The present embodiment is for illustrating the method for top and bottom combined blown converter vanadium extraction of the present invention.
By 145t vanadium-bearing hot metal, (it contains: the content of vanadium is 0.289 % by weight, the content of carbon is 4.52 % by weight, the content of silicon is 0.21 % by weight, the content of manganese is 0.18 % by weight) join and carry out oxygen supply blowing (employing be oxygen: the mixed gas that the volume ratio of carbonic acid gas is 3:1) after converter, after blowing 1min, add 18kg/t
molten ironrefrigerant (consisting of: the pig of 10 % by weight, the iron sheet ball of 90 % by weight).Wherein, the duration of oxygen supply blowing is 6min, and the winding-up intensity of mixed gas is 3.5m
3/ (mint
molten iron), and adopt the rifle position of 1.8m to carry out oxygen supply blowing in the 0.5min carrying out after oxygen supply blowing starts, and in oxygen supply converting process, adopt the rifle position of 1.6m to carry out oxygen supply blowing, before oxygen supply finishing blowing, 1.5min adopts the rifle position of 1.8m to carry out oxygen supply blowing.Meanwhile, before oxygen supply blowing starts, with 0.001m
3/ (mint
molten iron) winding-up intensity, by furnace bottom gas permeable brick bottom blowing nitrogen; Start to oxygen supply finishing blowing with 0.5m from oxygen supply blowing
3/ (mint
molten iron) winding-up intensity carry out bottom blowing nitrogen.The temperature of oxygen supply blow end point molten iron is 1367 DEG C, and the vanadium oxidation ratio of this vanadium-bearing hot metal is 92.01%, and oxidation of coal rate is 10.3%.
Embodiment 2
The present embodiment is for illustrating the method for top and bottom combined blown converter vanadium extraction of the present invention.
By 230t vanadium-bearing hot metal, (it contains: the content of vanadium is 0.324 % by weight, the content of carbon is 4.66 % by weight, the content of silicon is 0.16 % by weight, the content of manganese is 0.21 % by weight) join and carry out oxygen supply blowing (employing be oxygen: the mixed gas that the volume ratio of carbonic acid gas is 5:1) after converter, after blowing 1.5min, add 19kg/t
molten ironrefrigerant (consisting of: the pellet of 30 % by weight, the iron sheet ball of 70 % by weight), wherein, the duration of oxygen supply blowing is 5.5min, the winding-up intensity of mixed gas is 2.5m
3/ (mint
molten iron), and adopt the rifle position of 1.9m to carry out oxygen supply blowing in the 1min carrying out after oxygen supply blowing starts, and in oxygen supply converting process, adopt the rifle position of 1.6m to carry out oxygen supply blowing, before oxygen supply finishing blowing, 1min adopts the rifle position of 1.9m to carry out oxygen supply blowing.Meanwhile, before oxygen supply blowing starts, with 0.0015m
3/ (mint
molten iron) winding-up intensity, by furnace bottom gas permeable brick bottom blowing nitrogen; Start to oxygen supply finishing blowing with 0.4m from oxygen supply blowing
3/ (mint
molten iron) winding-up intensity carry out bottom blowing nitrogen.The temperature of oxygen supply blow end point molten iron is 1379 DEG C, and the vanadium oxidation ratio of this vanadium-bearing hot metal is 91.18%, and oxidation of coal rate is 11.23%.
Embodiment 3
The present embodiment is for illustrating the method for top and bottom combined blown converter vanadium extraction of the present invention.
By 142t vanadium-bearing hot metal, (it contains: the content of vanadium is 0.302 % by weight, the content of carbon is 4.56 % by weight, the content of silicon is 0.18 % by weight, the content of manganese is 0.19 % by weight) join and carry out oxygen supply blowing (employing be oxygen: the mixed gas that the volume ratio of carbonic acid gas is 4:1) after converter, after 0.5min, add 16kg/t
molten ironrefrigerant (consisting of: the iron sheet ball of 100 % by weight).Wherein, the duration of oxygen supply blowing is 6min, and the winding-up intensity of mixed gas is 3m
3/ (mint
molten iron), and adopt the rifle position of 1.7m to carry out oxygen supply blowing in the 1.5min carrying out after oxygen supply blowing starts, and in oxygen supply converting process, adopt the rifle position of 1.5m to carry out oxygen supply blowing, before oxygen supply finishing blowing, 1min adopts the rifle position of 1.7m to carry out oxygen supply blowing.Meanwhile, before oxygen supply blowing starts, with 0.001m
3/ (mint
molten iron) winding-up intensity, by furnace bottom gas permeable brick bottom blowing nitrogen; Start to oxygen supply finishing blowing with 0.3m from oxygen supply blowing
3/ (mint
molten iron) winding-up intensity carry out bottom blowing nitrogen.The temperature of oxygen supply blow end point molten iron is 1367 DEG C, and the vanadium oxidation ratio of this vanadium-bearing hot metal is 90.56%, and oxidation of coal rate is 11.29%.
Embodiment 4
The present embodiment is for illustrating the method for top and bottom combined blown converter vanadium extraction of the present invention.
By 86t vanadium-bearing hot metal, (it contains: the content of vanadium is 0.226 % by weight, the content of carbon is 4.7 % by weight, the content of silicon is 0.23 % by weight, the content of manganese is 0.31 % by weight) join and carry out oxygen supply blowing (employing be oxygen: the mixed gas that the volume ratio of carbonic acid gas is 4.5:1) after converter, blowing 1min adds 19kg/t
molten ironrefrigerant (consisting of: the pig of 5 % by weight, the iron sheet ball of 80 % by weight, the pellet of 15 % by weight).Wherein, the duration of oxygen supply blowing is 5min, and the winding-up intensity of mixed gas is 4m
3/ (mint
molten iron), and adopt the rifle position of 1.8m to carry out oxygen supply blowing in the 1.5min carrying out after oxygen supply blowing starts, and in oxygen supply converting process, adopt the rifle position of 0.6m to carry out oxygen supply blowing, before oxygen supply finishing blowing, 1.5min adopts the rifle position of 1.8m to carry out oxygen supply blowing.Meanwhile, before oxygen supply blowing starts, with 0.0015m
3/ (mint
molten iron) winding-up intensity, by furnace bottom gas permeable brick bottom blowing nitrogen; Start to oxygen supply finishing blowing with 0.45m from oxygen supply blowing
3/ (mint
molten iron) winding-up intensity carry out bottom blowing nitrogen.The temperature of oxygen supply blow end point molten iron is 1382 DEG C, and the vanadium oxidation ratio of this vanadium-bearing hot metal is 91.97%, and oxidation of coal rate is 12.32%.
Comparative example 1
According to the method for embodiment 1, difference is, what oxygen supply blowing adopted is not the mixed gas of carbon dioxide and oxygen but only have oxygen, and the temperature of blow end point molten iron is 1386 DEG C, the vanadium oxidation ratio of its vanadium-bearing hot metal is 85.31%, and oxidation of coal rate is 16.27%.
Can find out by embodiment 1 and comparative example 1, under the condition of refrigerant that uses same amount, can improve vanadium oxidation ratio by method of the present invention, and reduce oxidation of coal rate.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode, for fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible array modes.
In addition, also can carry out arbitrary combination between various embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. the method for a top and bottom combined blown converter vanadium extraction, the method comprises: vanadium-bearing hot metal and refrigerant are joined in converter, and carry out oxygen supply blowing and bottom blowing, what described bottom blowing adopted is nitrogen, it is characterized in that, what described oxygen supply blowing adopted is the mixed gas of oxygen and carbonic acid gas.
2. method according to claim 1, wherein, in the oxygen that described oxygen supply blowing adopts and the mixed gas of carbonic acid gas, the volume ratio of oxygen and carbonic acid gas is (3-8): 1.
3. method according to claim 2, wherein, in the oxygen that described oxygen supply blowing adopts and the mixed gas of carbonic acid gas, the volume ratio of oxygen and carbonic acid gas is (3-5): 1.
4. method according to claim 3, wherein, in the oxygen that described oxygen supply blowing adopts and the mixed gas of carbonic acid gas, the volume ratio of oxygen and carbonic acid gas is (3-4.5): 1, be preferably (3.5-4.5): 1.
5. according to the method described in any one in claim 1-4, wherein, the winding-up intensity of described mixed gas is 2-6m
3/ (mint
molten iron).
6. method according to claim 5, wherein, the winding-up intensity of described mixed gas is 2.5-4m
3/ (mint
molten iron).
7. method according to claim 1, wherein, described bottom blowing is included between the oxygen supply blowing process and between the non-oxygen supply blowing process and adopts carbonic acid gas upwards to jet from furnace bottom, and the winding-up intensity of the nitrogen adopting between the oxygen supply blowing process is 0.1-0.5m
3/ (mint
molten iron), be preferably 0.2-0.4m
3/ (mint
molten iron); The winding-up intensity of the nitrogen adopting between the non-oxygen supply blowing process is 0.0005-0.0015m
3/ (mint
molten iron), be preferably 0.001-0.0014m
3/ (mint
molten iron); Preferably, in described oxygen supply converting process, adopt the jet mixed gas of oxygen and carbonic acid gas of oxygen rifle, described oxygen rifle adopts the rifle position of 1.8-2m in the time that oxygen supply blowing starts 0.5-1.5min, the rifle position that adopts 1.5-1.7m in oxygen supply blowing mid-term, before oxygen supply finishing blowing, 1-1.5min adopts the rifle position of 1.8-2m.
8. method according to claim 7, wherein, described oxygen rifle adopts the rifle position of 1.85-1.95m in the time that oxygen supply blowing starts 0.5-1.5min, adopts the rifle position of 1.55-1.65m in oxygen supply blowing mid-term, and before oxygen supply finishing blowing, 1-1.5min adopts the rifle position of 1.85-1.95m.
9. method according to claim 1, wherein, the consumption of described refrigerant is 15-25kg/t
molten iron, be preferably 16-19kg/t
molten iron.
10. method according to claim 1, wherein, in described vanadium-bearing hot metal, the content of vanadium is 0.2-0.35 % by weight, and the content of carbon is 4-5 % by weight, and the content of silicon is 0.1-0.3 % by weight, and the content of manganese is 0.15-0.5 % by weight.
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| CN111575434A (en) * | 2020-06-30 | 2020-08-25 | 武钢集团昆明钢铁股份有限公司 | Converter smelting method for vanadium extraction slag grade of molten vanadium iron in medium silicon |
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| CN108179245A (en) * | 2018-01-29 | 2018-06-19 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of composite air supply vanadium extraction by converter blowing method |
| CN108265184A (en) * | 2018-04-16 | 2018-07-10 | 攀钢集团研究院有限公司 | Converter segmented supplies extraction vanadium method |
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| CN111235352B (en) * | 2020-02-28 | 2021-09-17 | 中冶东方工程技术有限公司 | Method and system for preparing vanadium-rich slag and low-vanadium alloy from low-vanadium alloy and AOD (argon oxygen decarburization) duplex |
| CN111575434A (en) * | 2020-06-30 | 2020-08-25 | 武钢集团昆明钢铁股份有限公司 | Converter smelting method for vanadium extraction slag grade of molten vanadium iron in medium silicon |
| CN111575434B (en) * | 2020-06-30 | 2022-01-25 | 武钢集团昆明钢铁股份有限公司 | Converter smelting method for vanadium extraction slag grade of molten vanadium iron in medium silicon |
| CN111961795A (en) * | 2020-08-09 | 2020-11-20 | 徐州宏阳新材料科技有限公司 | Smelting process of low-titanium high-carbon ferrochrome |
| CN111961788A (en) * | 2020-08-09 | 2020-11-20 | 徐州宏阳新材料科技有限公司 | Smelting process of low-vanadium high-carbon ferrochromium |
| CN112522468A (en) * | 2020-11-30 | 2021-03-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Bottom blowing CO of converter2Method for extracting vanadium |
| CN112522467A (en) * | 2020-11-30 | 2021-03-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Converter sectional bottom blowing CO2Method for extracting vanadium |
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