CN103966392B - A kind of method of top and bottom combined blown converter vanadium extraction - Google Patents
A kind of method of top and bottom combined blown converter vanadium extraction Download PDFInfo
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Abstract
The invention discloses 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 carries out oxygen supply blowing and bottom blowing, wherein, and the mixed gas of what described oxygen supply blowing adopted is oxygen and carbonic acid gas; Described bottom blowing comprises: before oxygen supply blowing, adopt nitrogen to carry out the first bottom blowing, switches to CO (carbon monoxide converter) gas to carry out the second bottom blowing when oxygen supply blowing starts.Adopt the method for vanadium extraction by converter blowing of the present invention, under the condition not adding a large amount of refrigerant, gained vanadium oxidation ratio higher than 90% and oxidation of coal rate lower than 13%.
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 before molten iron-steelmaking must vanadium extraction to produce vanadium slag, be the general way of acquisition vanadium resource.At present, the method 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 comprise v-bearing steel slag vanadium extraction, process for extracting vanadium from stone coal etc. in addition.Wherein optimum with vanadium extraction by converter blowing technique, the most economical.
Usually constantly vanadium extraction by converter blowing technique is 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, [Si], [Mn], [V], element oxide such as [C] makes molten bath be rapidly heated, and [Si], before [Mn] oxidation occurs in [V] oxidation, its oxidation is difficult to suppress, and [C], the invert point of the oxidation of [V] is at about 1385 DEG C, lower than this temperature, vanadium has precedence over oxidation of coal, higher than this temperature, carbon has precedence over vanadium oxidation, therefore the high oxidation rate of [V] and high yield will be obtained, vanadium-raising cooling agent must be added, control bath temperature to make it to approach [C], [V] invert point, reach the object that carbon is protected in vanadium extraction.So adopt the mode adding 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 carry out control temperature as seen.
Summary of the invention
The object of the invention is to overcome the defect that in existing vanadium extraction by converter blowing, refrigerant consumption is high, the method for the top and bottom combined blown converter vanadium extraction that the oxidation ratio of the few vanadium of a kind of refrigerant consumption is high is provided.
The present inventor furthers investigate discovery, the mode of jetting is carried out when adopting the mixed gas of oxygen and carbonic acid gas in the oxygen supply converting process at vanadium extraction by converter blowing, combine again and adopt CO (carbon monoxide converter) gas to carry out bottom blowing, greatly can reduce the oxidation of coal rate of molten iron, improve the oxidation ratio of vanadium, and lower the temperature without the need to adding a large amount of refrigerants.
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 carries out oxygen supply blowing and bottom blowing, wherein, and the mixed gas of what described oxygen supply blowing adopted is oxygen and carbonic acid gas; Described bottom blowing comprises: before oxygen supply blowing, adopt nitrogen to carry out the first bottom blowing, switches to CO (carbon monoxide converter) gas to carry out the second bottom blowing when oxygen supply blowing starts.
Adopt the method for vanadium extraction by converter blowing of the present invention, can under the condition not adding a large amount of refrigerant, 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 in embodiment part subsequently.
Embodiment
Below the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
In the present invention, in the content of vanadium in the vanadium-bearing hot metal before vanadium oxidation ratio refers to vanadium extraction and the half steel after vanadium extraction, content of vanadium subtracts each other the weight percent of the content of vanadium in the vanadium-bearing hot metal before the difference of gained and vanadium extraction.
In the present invention, in the carbon content in the vanadium-bearing hot metal before oxidation of coal rate refers to vanadium extraction and the half steel after vanadium extraction, carbon content subtracts each other the weight percent of the carbon content in the vanadium-bearing hot metal before the difference of gained and vanadium extraction.
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 carries out oxygen supply blowing and bottom blowing, wherein, and the mixed gas of what described oxygen supply blowing adopted is oxygen and carbonic acid gas; Described bottom blowing comprises: before oxygen supply blowing, adopt nitrogen to carry out the first bottom blowing, switches to CO (carbon monoxide converter) gas to carry out the second bottom blowing when oxygen supply blowing starts.
Blowing in the present invention refers to that from oxygen supply blowing, provide the mixed gas of oxygen and carbon dioxide to carry out oxygen supply stops 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 such as obtained after blast-furnace smelting by vanadium titano-magnetite.Method due to vanadium extraction by converter blowing of the present invention can obtain higher vanadium oxidation ratio and lower oxidation of coal rate, therefore, may be used for the vanadium extraction process of the lower vanadium-bearing hot metal of content of vanadium, the content of the such as vanadium of 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 4.5-4.8 % 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.The thermosteresis of vanadium extracting process can also be reduced in the process of the vanadium-bearing hot metal of above-mentioned scope.Also may containing a small amount of sulphur, phosphorus, titanium etc. in described vanadium-bearing hot metal, the content of such as 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 the impact of these impurity elements on vanadium extraction is little.The temperature of described vanadium-bearing hot metal can the temperature of vanadium-bearing hot metal handled by the vanadium extraction by converter blowing of this area routine, and preferably, the temperature of described vanadium-bearing hot metal controls near the temperature of carbon-vanadium oxidation conversion point, such as 1200-1320 DEG C.
According to the present invention, described vanadium-bearing hot metal being joined in converter and blows, in order to control the temperature of molten iron in the stove in converting process better, needing to add refrigerant in converter.Described refrigerant can add in any time section before oxygen supply blowing and/or in oxygen supply converting process.Although to not having any restriction the opportunity that adds of described refrigerant in the present invention, but the oxidation of the carbon in oxygen supply converting process can be controlled better owing to adopting method of the present invention and avoid because it is oxidized the problem of high temperature caused, therefore, in order to simplify the operation, the present invention preferably to join after converter 0.5-1.5min after starting to carry out oxygen supply blowing until described vanadium-bearing hot metal and adds described refrigerant.And, although the consumption of described refrigerant can be the consumption of this area routine, but adopt the refrigerant of less amount just can obtain the low and molten iron that vanadium oxidation ratio is high of oxidation of coal rate in the present invention after oxygen supply finishing blowing, therefore, for the reason reduced costs, preferably, the consumption of described refrigerant is 15-25kg/t
molten iron, be more preferably 17-19kg/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, be preferably in pig, iron sheet ball, sludge ball, pellet one or more.
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 such as described pig refers to the iron block that vanadium-bearing hot metal is cast, 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, and it contains the iron of 40-50 % by weight; Described sludge ball refers to that the dirt ash removed by converter extracting vanadium obtains through pelletizing, and it contains the TFe of 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 blast furnace agglomerate produced containing vanadium iron concentrate; Described pellet refers to the pelletizing produced containing vanadium iron concentrate.
According to one of the present invention preferred embodiment, the pig consisting of 10-20 % by weight of described refrigerant, the iron sheet ball of 60-80 % by weight, the pellet of 10-20 % 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 consisting of 10-20 % by weight of described refrigerant, the iron sheet ball of 50-70 % by weight, the pellet of 20-30 % 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 injecting oxygen and carbonic acid gas above converter carries out oxygen supply blowing.In the present invention, as long as oxygen supply blowing adopts is the mixed gas of oxygen and carbonic acid gas, can realize after oxygen supply finishing blowing, the higher and effect that oxidation of coal rate is lower of the vanadium oxidation ratio of described vanadium-bearing hot metal.Preferably, in the mixed gas of the oxygen that described oxygen supply blowing adopts and carbonic acid gas, the volume ratio of oxygen and carbonic acid gas is (3-10): 1, be more preferably (4-6): 1, further be preferably (4.5-5.5): 1, described volume ratio be standard atmosphere pressure volume ratio.
In the present invention, the mixed gas of what described oxygen supply blowing adopted is oxygen and carbonic acid gas, both can realize the oxidation to metals such as the vanadium in molten iron in conventional oxygen supply blowing, and the oxidation of carbon in molten iron can have been suppressed again to a greater extent, realize the object that carbon is protected in vanadium extraction.Therefore, in the present invention, to the condition of oxygen supply blowing, there is no particular limitation, 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 1.5-5m
3/ (mint
molten iron), be more preferably 2-3.5m
3/ (mint
molten iron), be further preferably 2.2-3.2m
3/ (mint
molten iron).Preferably, the time of described oxygen supply blowing is 5-8min, is more preferably 5.5-7min.
Oxygen rifle can be adopted to carry out the winding-up of the mixed gas of oxygen and carbonic acid gas in the present invention, the rifle position of the oxygen rifle adopted in described oxygen supply converting process can adopt the mapping mode of the conventional oxygen lance position in vanadium extraction by converter blowing process during oxygen supply blowing in this area, such as, 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 to than the oxygen supply blowing rifle position that adopts low rifle position higher in mid-term in same process, and high rifle position herein does not have other limiting meanings.Preferably, in described oxygen supply converting process, oxygen rifle is adopted to carry out the mixed gas of injecting oxygen and carbonic acid gas, described oxygen rifle adopts the rifle position of 1.7-2.1m when oxygen supply blowing starts 0.5-1.5min, adopt the rifle position of 1.5-1.7m mid-term in oxygen supply blowing, before oxygen supply finishing blowing, 1-1.5min adopts the rifle position of 1.7-2.1m; Preferably, described oxygen rifle adopts the rifle position of 1.7-1.9m when oxygen supply blowing starts 0.5-1.5min, adopt the rifle position of 1.5-1.6m mid-term in oxygen supply blowing, before oxygen supply finishing blowing, 1-1.5min adopts the rifle position of 1.7-1.9m.Oxygen lance position adopts such " high-low-high " pattern, can reach and reduce the effect such as vanadium slag iron level, raising vanadium oxidation ratio.Wherein, the height in the face, nozzle distance molten bath (minimum level of molten iron) of oxygen rifle is called as rifle position.
According to the present invention, wherein, the bottom blowing of top and bottom complex blowing comprises: before oxygen supply blowing, adopt nitrogen to carry out the first bottom blowing, switches to CO (carbon monoxide converter) gas to carry out the second bottom blowing when oxygen supply blowing starts.
According to the present invention, described first bottom blowing refer to adopt before not carrying out oxygen supply blowing nitrogen by converter bottom gas permeable brick to lower and on converter is jetted, the unobstructed object of guarantee gas permeable brick can be realized with this.In the present invention, the winding-up intensity adopting nitrogen to carry out the nitrogen of the first bottom blowing is not particularly limited, can changes in wider scope before oxygen supply blowing.Preferably, in described first bottom blowing, the winding-up intensity of nitrogen is 0.0015m
3/ (mint
molten iron) below, be preferably 0.001-0.0012m
3/ (mint
molten iron).
According to the present invention, described second bottom blowing refer to oxygen supply blowing start time switch to CO (carbon monoxide converter) gas to jet the nitrogen in the first bottom blowing, namely oxygen supply blowing whole process in all adopt carbon monoxide to carry out bottom blowing.By the second bottom blowing, the storeroom in converter can be made the to fill atmosphere of carbon monoxide, thus the object that can reach the oxidizing reaction of the carbon reduced in molten iron.Therefore, be not particularly limited the winding-up intensity of the CO (carbon monoxide converter) gas in the second bottom blowing in the present invention, as long as can realize above-mentioned purpose, preferably, in described second bottom blowing, the winding-up intensity of CO (carbon monoxide converter) gas is 0.1-0.5m
3/ (mint
molten iron), be more preferably 0.2-0.4m
3/ (mint
molten iron).
Adopt the method for top and bottom combined blown converter vanadium extraction of the present invention, temperature can be controlled preferably at carbon-vanadium oxidation conversion point, preferably, the temperature of the terminal molten iron of described oxygen supply blowing controls at 1350-1380 DEG C.
According to aforesaid method, can when 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%, and preferred oxidation of coal rate is below 11%.
Below will be described the present invention by embodiment.
In following examples and comparative example:
The measuring method of vanadium oxidation ratio is: get the half steel sample after the vanadium-bearing hot metal sample before vanadium extraction and vanadium extraction respectively, and adopt N-benzoylphenylhydroxyamine (N-BPHA) light-intensity method to detect content of vanadium wherein, content of vanadium in the content of vanadium in the vanadium-bearing hot metal before vanadium extraction and the half steel after vanadium extraction is subtracted each other the weight percent of the content of vanadium in the vanadium-bearing hot metal before the difference of gained and vanadium extraction;
The measuring method of oxidation of coal rate is: get the half steel sample after the vanadium-bearing hot metal sample before vanadium extraction and vanadium extraction respectively, and adopt the combustion gases volumetry recorded in " mensuration-combustion gases volumetry of CSM07030602-2003 steel alloy-carbon content " to detect carbon content wherein, carbon content in the carbon content in the vanadium-bearing hot metal before vanadium extraction and the half steel after vanadium extraction is subtracted each other the weight percent of the carbon content in the vanadium-bearing hot metal before the difference of gained and vanadium extraction.
Embodiment 1
The present embodiment is for illustration of the method for top and bottom combined blown converter vanadium extraction of the present invention.
By 141t vanadium-bearing hot metal, (it contains: the content of vanadium is 0.289 % by weight, the content of carbon is 4.44 % by weight, the content of silicon is 0.10 % by weight, the content of manganese is 0.21 % by weight) join converter after carry out oxygen supply blowing (employing be oxygen: the volume ratio of carbonic acid gas is the mixed gas of 4:1), add 19kg/t after blowing 0.5min
molten ironrefrigerant (consisting of: the pig of 10 % by weight, the iron sheet ball of 70 % by weight, the pellet of 20 % by weight).Wherein, the duration of oxygen supply blowing is 6min, and the intensity of oxygen supply blowing is 3.5m
3/ (mint
molten iron), and adopt the rifle position of 1.8m to carry out oxygen supply blowing in 0.5min after carrying out oxygen supply blowing and starting, 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; From oxygen supply blowing, switch to CO (carbon monoxide converter) gas with 0.1m the gas of bottom blowing
3/ (mint
molten iron) winding-up intensity carry out bottom blowing; Switch to nitrogen with 0.001m the gas of bottom blowing after oxygen supply finishing blowing
3/ (mint
molten iron) winding-up intensity carry out bottom blowing and start to next stove.The temperature of blow end point molten iron is 1376 DEG C, and the vanadium oxidation ratio of this vanadium-bearing hot metal is 91.33%, and oxidation of coal rate is 10.04%.
Embodiment 2
The present embodiment is for illustration of the method for top and bottom combined blown converter vanadium extraction of the present invention.
By 210t vanadium-bearing hot metal, (it contains: the content of vanadium is 0.32 % by weight, the content of carbon is 4.65 % by weight, the content of silicon is 0.18 % by weight, the content of manganese is 0.20 % by weight) join converter after carry out oxygen supply blowing (employing be oxygen: the volume ratio of carbonic acid gas is the mixed gas of 6:1), add 17kg/t after blowing 1min
molten ironrefrigerant (the iron sheet balls of 100 % by weight).Wherein, the duration of oxygen supply blowing is 6.5min, and the intensity of oxygen supply blowing is 2m
3/ (mint
molten iron), and adopt the rifle position of 1.9m to carry out oxygen supply blowing in 1.5min after carrying out oxygen supply blowing and starting, 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; From oxygen supply blowing, switch to CO (carbon monoxide converter) gas with 0.5m the gas of bottom blowing
3/ (mint
molten iron) winding-up intensity carry out bottom blowing; Switch to nitrogen with 0.0015m the gas of bottom blowing after oxygen supply finishing blowing
3/ (mint
molten iron) winding-up intensity carry out bottom blowing and start to next stove.The temperature of blow end point molten iron is 1375 DEG C, and the vanadium oxidation ratio of this vanadium-bearing hot metal is 90.71%, and oxidation of coal rate is 10.33%.
Embodiment 3
The present embodiment is for illustration of 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 0.210 % by weight, the content of carbon is 4.71 % by weight, the content of silicon is, 0.11 % by weight, the content of manganese is 0.17 % by weight) join converter after carry out oxygen supply blowing (employing be oxygen: the volume ratio of carbonic acid gas is the mixed gas of 5:1), add 18kg/t after blowing 0.5min
molten ironrefrigerant (consisting of: the pig of 10 % by weight, the iron sheet ball of 60 % by weight, the pellet of 30 % by weight).Wherein, the duration of oxygen supply blowing is 6min, and the intensity of oxygen supply blowing is 2.5m
3/ (mint
molten iron), and adopt the rifle position of 1.7m to carry out oxygen supply blowing in 1.5min after carrying out oxygen supply blowing and starting, 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 0.0012m
3/ (mint
molten iron) winding-up intensity, by furnace bottom gas permeable brick bottom blowing nitrogen; From oxygen supply blowing, switch to CO (carbon monoxide converter) gas with 0.3m the gas of bottom blowing
3/ (mint
molten iron) winding-up intensity carry out bottom blowing; Switch to nitrogen with 0.4m the gas of bottom blowing after oxygen supply finishing blowing
3/ (mint
molten iron) winding-up intensity carry out bottom blowing and start to next stove.The temperature of blow end point molten iron is 1368 DEG C, and the vanadium oxidation ratio of this vanadium-bearing hot metal is 91.06%, and oxidation of coal rate is 10.42%.
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 has oxygen, and in oxygen supply converting process, do not switch to carbon monoxide to carry out bottom blowing, but directly the winding-up intensity of nitrogen is adjusted to 0.1m
3/ (mint
molten iron) winding-up intensity carry out bottom blowing, the temperature of blow end point molten iron is 1384 DEG C, and the vanadium oxidation ratio of its vanadium-bearing hot metal is 86.33%, and oxidation of coal rate is 15.86%.
By embodiment 1 and comparative example 1 known, by method of the present invention, vanadium oxidation ratio can be provided 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 the concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode,
In order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out arbitrary combination between various different 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 (12)
1. a method for top and bottom combined blown converter vanadium extraction, the method comprises: vanadium-bearing hot metal and refrigerant are joined in converter, and carries out oxygen supply blowing and bottom blowing, it is characterized in that, the mixed gas of what described oxygen supply blowing adopted is oxygen and carbonic acid gas; Described bottom blowing comprises: before oxygen supply blowing, adopt nitrogen to carry out the first bottom blowing, switches to CO (carbon monoxide converter) gas to carry out the second bottom blowing when oxygen supply blowing starts; In the mixed gas of the oxygen that described oxygen supply blowing adopts and carbonic acid gas, the volume ratio of oxygen and carbonic acid gas is (3-10): 1; In described second bottom blowing, the winding-up intensity of CO (carbon monoxide converter) gas is 0.1-0.5m
3/ (mint
molten iron); The consumption of described refrigerant is 17-19kg/t
molten iron.
2. method according to claim 1, wherein, in the mixed gas of the oxygen that described oxygen supply blowing adopts and carbonic acid gas, the volume ratio of oxygen and carbonic acid gas is (4-6): 1.
3. method according to claim 2, wherein, in the mixed gas of the oxygen that described oxygen supply blowing adopts and carbonic acid gas, the volume ratio of oxygen and carbonic acid gas is (4.5-5.5): 1.
4. according to the method in claim 1-3 described in any one, wherein, the winding-up intensity of described mixed gas is 1.5-5m
3/ (mint
molten iron).
5. method according to claim 4, wherein, the winding-up intensity of described mixed gas is 2-3.5m
3/ (mint
molten iron).
6. method according to claim 5, wherein, the winding-up intensity of described mixed gas is 2.2-3.2m
3/ (mint
molten iron).
7. method according to claim 1, wherein, in described first bottom blowing, the winding-up intensity of nitrogen is 0.0015m
3/ (mint
molten iron) below.
8. method according to claim 7, wherein, in described first bottom blowing, the winding-up intensity of nitrogen is 0.001-0.0012m
3/ (mint
molten iron).
9. method according to claim 1, wherein, in described second bottom blowing, the winding-up intensity of CO (carbon monoxide converter) gas is 0.2-0.4m
3/ (mint
molten iron).
10. according to the method in claim 1-3 described in any one, wherein, in described oxygen supply converting process, oxygen rifle is adopted to carry out the mixed gas of injecting oxygen and carbonic acid gas, described oxygen rifle adopts the rifle position of 1.7-2.1m when oxygen supply blowing starts 0.5-1.5min, adopt the rifle position of 1.5-1.7m mid-term in oxygen supply blowing, before oxygen supply finishing blowing, 1-1.5min adopts the rifle position of 1.7-2.1m.
11. methods according to claim 10, wherein, described oxygen rifle adopts the rifle position of 1.7-1.9m when oxygen supply blowing starts 0.5-1.5min, adopt the rifle position of 1.5-1.6m mid-term in oxygen supply blowing, before oxygen supply finishing blowing, 1-1.5min adopts the rifle position of 1.7-1.9m.
12. methods according to claim 1, wherein, the content of the vanadium of described vanadium-bearing hot metal 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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| CN104673956B (en) * | 2015-03-16 | 2017-01-18 | 攀钢集团研究院有限公司 | Method for extracting vanadium and chromium in converter |
| CN104694694B (en) * | 2015-03-16 | 2017-03-15 | 攀钢集团研究院有限公司 | A kind of method that vanadium chromium is extracted in converter |
| CN104831091B (en) * | 2015-04-28 | 2017-05-31 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of combined blown converter vanadium extraction |
| CN104862499A (en) * | 2015-04-28 | 2015-08-26 | 攀钢集团攀枝花钢铁研究院有限公司 | Vanadium extracting method by combined-blown converter |
| CN107904349A (en) * | 2017-11-29 | 2018-04-13 | 攀钢集团西昌钢钒有限公司 | A kind of top and bottom combined blown converter extraction vanadium method |
| CN115821070A (en) * | 2022-12-06 | 2023-03-21 | 中国科学院过程工程研究所 | Method for extracting vanadium by oxidizing molten iron |
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