CN106244827B - A kind of smelting endpoint of smelting titanium slag with electric stove judges system and method - Google Patents
A kind of smelting endpoint of smelting titanium slag with electric stove judges system and method Download PDFInfo
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- CN106244827B CN106244827B CN201610803499.9A CN201610803499A CN106244827B CN 106244827 B CN106244827 B CN 106244827B CN 201610803499 A CN201610803499 A CN 201610803499A CN 106244827 B CN106244827 B CN 106244827B
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22B34/00—Obtaining refractory metals
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Abstract
The invention discloses a kind of smelting endpoints of smelting titanium slag with electric stove to judge system and method.The system includes electric furnace, determines oxygen measurement device, data collector and arithmetic unit；Determine the top that oxygen measurement device is located at the electric furnace, including Determining oxygen probe, survey rifle and lift actuator；The data collector is connect by being arranged on the conducting wire surveyed in rifle with the Determining oxygen probe, for collecting and recording dense oxygen difference potential information and temperature information, and is transferred to the arithmetic unit；Arithmetic unit is connect with data collector, for calculating oxygen gesture, and compared with the threshold values in the database of arithmetic unit, to judge smelting endpoint.This method includes：1）Measuring temperature, dense oxygen difference potential；2）Calculate oxygen gesture；3）Judge smelting endpoint.The present invention is not needed under conditions of blowing out acquisition slag specimen carries out constituent analysis, can accurately, quickly judge smelting endpoint, and it is stable, shorten the heat 30min or so, significantly improves production efficiency, applied widely.
Description
Technical field
The invention belongs to titanium slag electric furnaces to smelt automatic control technology field, and in particular to a kind of smelting of smelting titanium slag with electric stove
Endpoint system and method.
Background technology
Titanium is a kind of strategic resource, and titanium-containing materials are all widely used in each department of national defence and national economy.Metal
Titanium has important use in Aeronautics and Astronautics, navigation, medical treatment etc.；Titanium dioxide is mainly used in chemical industry, weaving, medical treatment, food
The fields of grade.China's titanium resource very abundant, explored 9.65 hundred million tons of titanium resource is (with TiO2Meter, the same below), account for World Titanium money
The 38.85% of source wherein having 6.30 hundred million tons of the reserves of economic use value at present, accounts for the 45.59% of the similar reserves in the world.Gold
Belong to the production of titanium and titanium dioxide, be both needed to the enrichment process by titaniferous ore → rich-titanium material, high titanium slag is the main production of rich-titanium material
Product form.Therefore, the production of high titanium slag is starting point prepared by titanium-containing materials and basic.
China just researches and develops the technology of smelting titanium slag with electric stove since the fifties in last century, titanium slag smelting
It is exactly one of one of key technology to refine endpoint.Smelting endpoint namely titanium slag taste (the mainly TiO of smelting2, FeO
Content) at the time of reach production requirement.Judgement of the titanium slag factory to titanium slag smelting endpoint at present, mainly according to continuous smelting 3h with
On, electricity consumption overrate, melting enters high current stationary phase about 1h, and electrode position fluctuation is smaller and tends towards stability and waits manually
Experience.It is found in actual production and theoretical research, smelting endpoint is judged according to above-mentioned knowhow, this and field worker
Experience and working condition have close relationship, and there are the problems such as smelting endpoint hit rate is low, and production stability is poor.In addition it smelts
Process titanium slag grade is unqualified to be examined, so in order to increase titanium slag grade qualification rate, many times will blowing out sampling, profit
Constituent analysis is carried out to it with chemical analysis method, so as to judge smelt whether reach smelting endpoint.The time required to this process
Length, means are cumbersome, serious to reduce titanium slag production efficiency.
Therefore, how to develop it is a set of can accurately and rapidly judge smelting endpoint, improve production efficiency, product matter
The smelting endpoint of the smelting titanium slag with electric stove of amount judges system, becomes the technical issues of those skilled in the art are urgently to be resolved hurrily.
Invention content
For deficiencies of the prior art, the present invention provides a kind of smelting endpoint of smelting titanium slag with electric stove and judges system
System and method, to solve the problems such as existing titanium slag factory smelting endpoint judges that time-consuming, means are cumbersome, production stability is poor.
To achieve these goals, the technical solution adopted by the present invention is as follows：
A kind of smelting endpoint of smelting titanium slag with electric stove judges system, and dress is measured including being used for the electric furnace of smelting titanium slag, determining oxygen
It puts, data collector and arithmetic unit：Rifle including Determining oxygen probe, is surveyed in the top determined oxygen measurement device and be located at the electric furnace
And lift actuator；The survey rifle is vertically arranged, and lower end is connect with the Determining oxygen probe, and upper end is connect with the lift actuator；
The lift actuator is used to that the survey rifle to be driven to move back and forth in vertical direction.The survey rifle is hollow pipe, described
Data collector is connect by the conducting wire being arranged in the hollow pipe with the Determining oxygen probe, described determines oxygen for collecting and recording
The dense oxygen difference potential information and temperature information for measure of popping one's head in, and it is transmitted to the arithmetic unit；The arithmetic unit and the number
It connects according to collector, for calculating oxygen gesture, and the information in its database with arithmetic unit is compared, to judge to smelt eventually
Point.The electric stove tops are equipped with detection conduit, enter to complete calibrating with for the Determining oxygen probe.
Further, the Determining oxygen probe includes high temperature resistant sand body, the detector for examining and determine dense oxygen difference potential and temperature；
The high temperature resistant sand body in a tubular form, inside be installed with conducting wire, the upper end of the high temperature resistant sand body is provided with connector, is used for
It is formed and is detachably connected with the lower end for surveying rifle；The detector is fixed on the lower end of the high temperature resistant sand body.
Further, the detector includes protective case, dense oxygen difference potential detective tube and temperature detective tube；The protection
For set in the tubular of open at one end, blind end is fixed on the lower end of the high temperature resistant sand body, the openend of the tubular downward and
Sealant is provided with, so that the cylindrical interior forms protection chamber；The dense oxygen difference potential detective tube is in the hollow tube sealed
Shape, is additionally provided with vertical platinum filament in the dense oxygen difference potential detective tube, and the lower end of the platinum filament is located at the dense oxygen difference potential calibrating
The centre of pipe, the upper end is pierced by the dense oxygen difference potential detective tube, and the conducting wire with being arranged in high temperature resistant sand body is connect；
Cr and Cr are also filled with inside the dense oxygen difference potential detective tube2O3Powder, as cathode Cr/Cr2O3Reference electrode；It is described
Dense oxygen difference potential detective tube on the sealant, the dense oxygen difference potential detective tube top is located at the protection
In chamber, lower part is located at outside protection chamber；The temperature detective tube is the U-tube that bending section is arranged below, and one of the U pipes is straight
The length of pipe is more than another, wherein longer straight tube is long tube, shorter straight tube is short tube；The upper end of the long tube is located at institute
In the protection chamber stated；The upper end of the short tube is fixed in the sealant；Thermocouple is provided in the U pipes, the heat
One end of galvanic couple is pierced by from the tube wall of short tube and penetrates in the dense oxygen difference potential detective tube, and one is connected to the platinum filament
It rises；The other end of the thermocouple is pierced by the top of long tube, and the conducting wire with being arranged in high temperature resistant sand body is connect.
Further, the tube body of dense oxygen difference potential detective tube is ZrO2- CaO is made, and the temperature detective tube is by boron nitride
It is made, the sealant is made of aluminium oxide；High temperature resistant cement is filled in the protection chamber.
Further, the data collector is apparatus for determination of oxygen table analysis instrument；The arithmetic unit is computer.
Further, CE paper tubes are coated with outside the survey rifle, to protect survey rifle.
A kind of smelting endpoint judgment method of smelting titanium slag with electric stove, smelting of this method based on above-mentioned smelting titanium slag with electric stove
Endpoint system, includes the following steps：
1) measuring temperature, dense oxygen difference potential：The 1h before traditional smelting cycle terminates starts lift actuator and drives survey rifle edge
Vertical direction is fallen into from detection conduit in electric furnace, and detector is made to be inserted into 200~300mm below slag surface, measures 10 groups or more
Temperature, dense oxygen difference potential information and be transferred to the data collector, the data collector is collected and described in recording
The dense oxygen difference potential information and temperature information of Determining oxygen probe measure are simultaneously transferred to the arithmetic unit.
2) oxygen gesture is calculated：Arithmetic unit with titanium slag oxygen gesture mathematical model to receive each group temperature, dense oxygen difference potential believe
Breath carries out Continuous plus to obtain the titanium slag oxygen gesture value of corresponding number, as measuring point.
3) judge smelting endpoint：By the measuring point that step 2) obtains compared with the threshold range stored in database, when extremely
When rare 5 measuring point continuous-stables are in threshold range, you can judgement reaches smelting endpoint.
Further, the formula of the titanium slag oxygen gesture mathematical model described in step 2) is：
In formula, E is oxygen concentration potential, and unit V is measured by dense oxygen difference potential detective tube；R is gas constant, 8.314J/
(K·mol)；T is thermodynamic temperature, and unit K is measured by temperature detective tube；F is Faraday constant, 96485C/mol；
For titanium slag partial pressure of oxygen to be measured, i.e. titanium slag oxygen gesture, dimensionless；For cathode Cr/Cr2O3Reference electrode partial pressure of oxygen, by reference electrode
Material determines, is certain value；Pe is electron hole conductive features partial pressure of oxygen.
Wherein, the calculating formula of Pe is：
lgPe=-73.63+0.031/T.
Further, the operation of the temperature, dense oxygen difference potential information of the predetermined group number of measure described in step 1) is：Work as electric furnace
When interior temperature is 1600 DEG C~1800 DEG C, it is 15 groups to measure predetermined group number；Surveying start by set date lift actuator drives survey rifle edge perpendicular
Then Nogata starts lift actuator and drives to detector is inserted into 200~300mm below slag surface and keeps 7s~9.5s
It surveys rifle vertically to move upwards, detector is taken out from detection conduit；Preceding 30min carries out primary above-mentioned behaviour at interval of 6min
Make；After 30min, an aforesaid operations are carried out at interval of 3min.
Compared with prior art, the present invention has the advantages that：
1st, detection accuracy is high.The present invention is using the survey rifle for being assembled with Determining oxygen probe as detection means, after completing titanium slag smelting
Phase closes on the acquisition of smelting endpoint process data, operation, storage, so as to artificial experience be replaced to judge smelting endpoint, compared with tradition
Judgment method, the present invention can improve smelting endpoint hit rate.
2nd, production stability is good, efficient.Due to the system and method for the present invention, blowing out power-off is not needed to when detecting,
So as to ensure that the stability of production, production efficiency is also improved；Meanwhile the present invention can be with accurate judgement smelting endpoint, it can
Smelting cycle is obviously shortened, improves titanium slag production efficiency.
3rd, it is safe.Since system provided by the invention and detection method do not need to manually be detected, so as to avoid
People's operation under high temperature environment, improves safety.
Description of the drawings
Fig. 1 is that the smelting endpoint of smelting titanium slag with electric stove judges system schematic；
Fig. 2 is the structure diagram of Determining oxygen probe；
Fig. 3 is the structure diagram of detector；
Fig. 4 is titanium slag oxygen gesture and the relational graph of the duration of heat in embodiment 1；
Fig. 5 is titanium slag oxygen gesture and the relational graph of the duration of heat in embodiment 2.
In attached drawing：1-electric furnace；2-flip-arm；3-storage room；4-survey rifle；5-lift actuator；7-apparatus for determination of oxygen table
Analyzer；8-Determining oxygen probe；9-detection conduit；10-computer；11-protective cover；110-sealant；111-protection chamber；
12-temperature detective tube；121-thermocouple；13-high temperature resistant sand body；14-CE paper tubes, 15-dense oxygen difference potential detective tube；
151-platinum filament；16-connector.
Specific embodiment
The present invention is described in further detail with reference to specific embodiment.
First, a kind of smelting endpoint of smelting titanium slag with electric stove judges system, as shown in Figure 1, the electricity including being used for smelting titanium slag
Stove 1 determines oxygen measurement device, data collector and arithmetic unit；The top determined oxygen measurement device and be located at the electric furnace 1, packet
It includes Determining oxygen probe 8, survey rifle 4 and lift actuator 5；The survey rifle 4 is vertically arranged, and lower end is connect with the Determining oxygen probe 8, upper end with
The lift actuator 5 connects；The lift actuator 5 is used to that the survey rifle 4 to be driven to move back and forth in vertical direction；It is described
Survey rifle 4 for hollow pipe, the data collector is connected by the conducting wire being arranged in the hollow pipe with the Determining oxygen probe 8
It connects, for collecting and recording dense oxygen difference potential information and the temperature information that the Determining oxygen probe 8 measures, and is transmitted to described
Arithmetic unit；The arithmetic unit is connect with the data collector, for calculating oxygen gesture, and will be in its database with arithmetic unit
Information compares, to judge smelting endpoint；1 top of the electric furnace is equipped with detection conduit 9, with for the Determining oxygen probe 8 into
Enter to complete to examine and determine.
The lifting distance of the lift actuator 5 is preferably controlled within 500mm, ensures to survey 4 elevating movement control accuracy of rifle
± 10mm, this is conducive to the depth that Determining oxygen probe 8 is accurately controlled to probe into slag when detecting, so as to ensure the standard of verification result
Really.The lift actuator 5 can use various conventional shuttle apparatus, such as cylinder, spiral lifting instrument, electro-hydraulic servo control
Device processed, crank connecting link structure etc..To further improve control accuracy, PLC control system may be used to the lift actuator 5
It is controlled.
As an optimization, as shown in Fig. 2, the Determining oxygen probe 8 includes high temperature resistant sand body 13, for examining and determine dense oxygen difference potential
With the detector of temperature；The high temperature resistant sand body 13 in a tubular form, inside be installed with conducting wire, the high temperature resistant sand body 13 it is upper
End is provided with connector 16, is detachably connected for being formed with the lower end for surveying rifle 4；The detector is fixed on the resistance to height
The lower end of warm sand body 13.
Flimsy part (probes into titanium slag when being divided to Determining oxygen probe 8 and survey rifle 4 to two sections of designs convenient for replacing use at any time
In part), advantageously reduce cost, save maintenance time.
As an optimization, as shown in figure 3, the detector includes protective case, dense oxygen difference potential detective tube 15 and temperature inspection
Fixed tube 12；The protective case is in the tubular of open at one end, and blind end is fixed on the lower end of the high temperature resistant sand body 13, should
The openend of tubular downward and is provided with sealant 110, so that the cylindrical interior forms protection chamber 111.It can make dense oxygen in this way
The coupling part of poor potential detective tube 15 and temperature detective tube 12, which is placed in protection chamber 111, avoids it from being in direct contact with slag, this
Be conducive to improve the reliability of its service life and connection.
The dense oxygen difference potential detective tube 15 is gone back in the hollow tube shape of sealing in the dense oxygen difference potential detective tube 15
Vertical platinum filament 151 is provided with, the lower end of the platinum filament 151 is located at the centre of the dense oxygen difference potential detective tube 15, and the upper end is pierced by
The dense oxygen difference potential detective tube 15, and the conducting wire with being arranged in high temperature resistant sand body 13 is connect；In the dense oxygen difference electricity
Cr and Cr are also filled with inside gesture detective tube 152O3Powder, as cathode Cr/Cr2O3Reference electrode；The dense oxygen difference potential
For detective tube 15 on the sealant 110, dense 15 top of oxygen difference potential detective tube is located at the protection chamber 111
In, lower part is located at outside protection chamber 111.When measuring, dense oxygen difference potential detective tube 15 and the titanium slag of molten state form primary battery knot
Structure, can accurately detect out dense oxygen difference potential, and accuracy of detection can reach 2mv.
The temperature detective tube 12 is the U-tube that bending section is arranged below, and the length of a straight tube of the U pipes is more than
Another, wherein longer straight tube is long tube, shorter straight tube is short tube；The upper end of the long tube is located at the protection chamber
In 111；The upper end of the short tube is fixed in the sealant 110；Thermocouple 121 is provided in the U pipes, the thermoelectricity
Even 121 one end is pierced by from the tube wall of short tube and penetrates in the dense oxygen difference potential detective tube 15, connects with the platinum filament 151
It is connected together；The other end of the thermocouple 121 is pierced by the top of long tube, and the conducting wire with being arranged in high temperature resistant sand body 13 connects
It connects.This is to be able to the temperature for synchronously measuring the titanium slag of molten state, so as to combine the temperature of titanium slag oxygen gesture and titanium slag, more
Accurately judge that smelting endpoint, the measurement accuracy of thermocouple 121 is higher in addition, and up to 0 DEG C~4 DEG C, this is also beneficial to improve and survey
Fixed accuracy.
In addition, being additionally provided with protective cover 11 below sealant 110, which is the cylinder of upper end opening, is open
Place is connect with sealant 110, for dense oxygen difference potential detective tube 15 and temperature detective tube 12 to be protected to be located at 110 lower section of sealant
Part, i.e. test section.When detecting, protective cover 11 is taken down, when storage loads onto protective cover 11, is conducive to protect dense oxygen poor in this way
Potential detective tube 15 and temperature detective tube 12.
As an optimization, the tube body of the dense oxygen difference potential detective tube 15 is ZrO2- CaO is made, temperature calibrating
Pipe 12 is made of heat safe boron nitride material, and the sealant 110 is made of aluminium oxide；It is filled out in the protection chamber 111
Filled with high temperature resistant cement.
As an optimization, the data collector is apparatus for determination of oxygen table analysis instrument 7；Microcontroller may be used in the arithmetic unit
Computer 10 can also be used in module；Using the advantages of computer 10 be while oxygen gesture is calculated, can be intuitive by display
Ground synchronously shows data and figure, personal observations easy to operation and judgement, furthermore, it is possible to which database is directly installed
In computer 10, it is conveniently adjusted；It, thus can be with further, it is also possible to connect computer 10 with other equipment by network
It realizes the chain control and remote operation of each system, is conducive to further improve the degree of automation.
As an optimization, CE paper tubes 14 are coated with outside the survey rifle 4, to improve the heat-resisting ability for surveying rifle 4, so as to prolong
The long service life for surveying rifle 4.
In addition, this system can also include being arranged on 8 storage and transportation apparatus of Determining oxygen probe surveyed between rifle 4 and electric furnace 1, it includes
Storage room 3 and flip-arm 2；The storage room 3 is the babinet of one end open, for storing the Determining oxygen probe 8；The babinet
Opposite one end is fixed on hinge shaft with being open, and formation is rotatably connected；The flip-arm 2 is located at the opening of the babinet
Lower section is provided with the clamp device for gripping the Determining oxygen probe 8；The opening far from the babinet of flip-arm 2
One end of mouth is fixed on another hinge shaft, and formation is rotatably connected.
Before use, overturning storage room 3, Determining oxygen probe 8 from storage room 3 is poured out and is placed on flip-arm 2, on flip-arm 2
Clamp device clamp Determining oxygen probe 8, and be turned into vertical position, start lift actuator 5 drive survey rifle 4 vertically to
Lower movement makes to survey on rifle 4 in 8 grafting of Determining oxygen probe.
2nd, the smelting endpoint judgment method of a kind of smelting titanium slag with electric stove, this method is based on above-mentioned smelting titanium slag with electric stove
Smelting endpoint judges system, includes the following steps：
1) measuring temperature, dense oxygen difference potential：The 1h before traditional smelting cycle terminates starts lift actuator 5 and drives survey rifle 4
It is vertically fallen into electric furnace 1 from detection conduit 9, detector is made to be inserted into 200~300mm below slag surface, measured predetermined
The group temperature of number, dense oxygen difference potential information are simultaneously transferred to the data collector, and the data collector is collected and recorded
The dense oxygen difference potential information and temperature information of the measure of Determining oxygen probe 8 are simultaneously transferred to the arithmetic unit；
2) oxygen gesture is calculated：Arithmetic unit is poor to the temperature of predetermined group of number that receives, dense oxygen with titanium slag oxygen gesture mathematical model
Potential information carries out Continuous plus to obtain the titanium slag oxygen gesture value of corresponding number, as measuring point；Oxygen can also synchronously be drawn
Gesture-time-tendency graph, this facilitates look at the situation that oxygen gesture changes over time, and is also beneficial to judge whether oxygen gesture is stablized.
3) judge smelting endpoint：(threshold values is usual for the threshold range stored in measuring point and database that step 2) is obtained
The average measured for laboratory many experiments) compare, when at least 5 measuring point continuous-stables are in threshold range, i.e.,
Stablize 4.538 × 10-8~7.355 × 10-8During pa, you can judgement reaches smelting endpoint.
Wherein：The formula of titanium slag oxygen gesture mathematical model described in step 2) is：
In formula, E is oxygen concentration potential, and unit V is measured by dense oxygen difference potential detective tube；R is gas constant, 8.314J/
(K·mol)；T is thermodynamic temperature, and unit K is measured by temperature detective tube；F is Faraday constant, 96485C/mol；
For titanium slag partial pressure of oxygen to be measured, i.e. titanium slag oxygen gesture, dimensionless；For cathode Cr/Cr2O3Reference electrode partial pressure of oxygen, by reference electrode
Material determines, is certain value；Pe is electron hole conductive features partial pressure of oxygen.
The calculating formula of Pe is：
lgPe=-73.63+0.031/T.
As an optimization, the operation of the temperature, dense oxygen difference potential information of the predetermined group number of measure described in step 1) is：Work as electric furnace
When 1 in-furnace temperature is 1600 DEG C~1800 DEG C, it is 15 groups to measure predetermined group number；It surveys start by set date lift actuator 5 and drives survey rifle 4
Detector vertically is inserted into 200~300mm below slag surface (according to the titanium slag and iron water oxygen measured to be contained
Amount difference is adjusted with the temperature difference) and 7s~9.5s is kept, then startup lift actuator 5 drive is surveyed rifle 4 and is vertically transported upwards
It is dynamic, detector is taken out from detection conduit 9；Preceding 30min carries out an aforesaid operations at interval of 6min；After 30min, at interval of
3min carries out an aforesaid operations.
When titanium slag is smelted, with the progress of smelting, FeO is constantly reduced into metallic iron.In this process, titanium slag oxygen
Gesture, temperature constantly change with the reduction of FeO.When close to smelting endpoint, FeO reduction reaches capacity, titanium slag oxygen
Gesture slowly tends to be steady, and fluctuation is minimum.I.e. when titanium slag oxygen gesture becomes it is gradually steady almost unchanged when, when smelting also reaches smelting endpoint
It carves.Therefore, oxygen gesture can be as an important evidence for judging titanium slag smelting endpoint.Above-mentioned mathematical model is calculated by computer 10
It completes, at regular intervals, the automatic data for obtaining Determining oxygen probe 8 and collecting, founding mathematical models carry out titanium to computer 10
The Continuous plus of slag oxygen gesture, and result of calculation is continuously displayed in user interface, titanium slag smelter is instructed to carry out smelting endpoint and is sentenced
Disconnected, shorten the heat 30min or so, improves production efficiency, reduces cost.
3rd, embodiment
Embodiment 1
It adopts and system and method is judged with the smelting endpoint of above-mentioned smelting titanium slag with electric stove to judge that 85 type titanium slag electric furnaces are smelted eventually
Point：
The mass percent of primary raw material (ilmenite concentrate) chemical composition is 47.09%TiO2, 34.64%FeO, 5.89%
MgO, 3.53%SiO2, 1.57%CaO, 1.7%Al2O3, 5.52%Fe2O3, the mass percent of ilmenite concentrate granularity is configured to：Greatly
Account for about 4.77% in 0.074mm, 0.074~0.045mm accounts for about 37.98%, accounts for about 57.25% less than 0.045mm；By above-mentioned titanium
Concentrate and coke powder and pitch in mass ratio 100：11：7 are uniformly mixed, pressure ball, add in electric furnace and smash after dry 4h at 105 DEG C
It is real；Graphite electrode is fallen by mechanical device, is powered.Duration of heat control in 150min or so, fluctuate for 120min~
180min；
1) 1h before traditional smelting cycle terminates when electric furnace in-furnace temperature is 1600 DEG C~1800 DEG C, measures predetermined group
Number is 15 groups；Surveying start by set date lift actuator 5 drives survey rifle 4 that vertically detector is inserted into 200 below slag surface
~300mm simultaneously keeps 7s~9.5s, then starts lift actuator 5 and survey rifle 4 is driven vertically to move upwards, by detector
It is taken out from detection conduit 9；
Preceding 30min carries out an aforesaid operations at interval of 6min；After 30min, primary above-mentioned behaviour is carried out at interval of 3min
Make.
2) arithmetic unit with titanium slag oxygen gesture mathematical model to receive the temperature of predetermined group of number, dense oxygen difference potential information into
Row Continuous plus is to obtain the titanium slag oxygen gesture value of corresponding number, as measuring point；Computer 10 synchronously draws oxygen gesture-time and becomes
Gesture figure, and the relevant parameter or tendency chart of titanium slag oxygen gesture, temperature are continuously displayed in user interface, as shown in Figure 4；
3) threshold range (4.538 × 10 stored in the measuring point and database that obtain step 2)-8~7.355 × 10-8Pa) compare, from fig. 4, it can be seen that oxygen gesture stabilization is 4.557 × 10 after the 8th data point-8Pa or so is constant, so as to sentence
Disconnected smelting reaches smelting endpoint.
4) stop electric furnace smelting, pour out molten iron and titanium slag, carry out subsequent smelting operation.
Finishing slag after above-mentioned smelting is subjected to chemical composition analysis, as a result shows TiO2, Ti2O3 total contents are about
84.79%, it is seen that the smelting endpoint of smelting titanium slag with electric stove of the present invention judges that system and method can accurately and rapidly judge to smelt
Terminal, so as to obtain production required product.
Embodiment 2
It adopts and system and method is judged with the smelting endpoint of above-mentioned smelting titanium slag with electric stove to judge that 74 type titanium slag electric furnaces are smelted eventually
Point：
The mass percent of primary raw material (ilmenite concentrate) chemical composition is 46.82%TiO2, 34.52%FeO, 5.66%
MgO, 3.23%SiO2, 0.842%CaO, 1.0%Al2O3, 6.10%Fe2O3, the mass percent of ilmenite concentrate granularity is configured to：+
0.084mm about 3.77%, 0.084~0.042mm about 35.98%, -0.042mm about 60.25%；By above-mentioned ilmenite concentrate and coke powder
With pitch in mass ratio 100：11：7 are uniformly mixed, pressure ball, add in electric furnace and consolidate after dry 4h at 105 DEG C；Pass through machine
Tool device falls graphite electrode, is powered.The duration of heat is controlled in 150min or so, is fluctuated as 120min~180min；
1) 1h before traditional smelting cycle terminates when electric furnace in-furnace temperature is 1600 DEG C~1800 DEG C, measures predetermined group
Number is 15 groups；Surveying start by set date lift actuator 5 drives survey rifle 4 that vertically detector is inserted into 200 below slag surface
~300mm simultaneously keeps 7s~9.5s, then starts lift actuator 5 and survey rifle 4 is driven vertically to move upwards, by detector
It is taken out from detection conduit 9；
Preceding 30min carries out an aforesaid operations at interval of 6min；After 30min, primary above-mentioned behaviour is carried out at interval of 3min
Make.
2) arithmetic unit with titanium slag oxygen gesture mathematical model to receive the temperature of predetermined group of number, dense oxygen difference potential information into
Row Continuous plus is to obtain the titanium slag oxygen gesture value of corresponding number, as measuring point；Computer 10 synchronously draws oxygen gesture-time and becomes
Gesture figure, and the relevant parameter or tendency chart of titanium slag oxygen gesture, temperature are continuously displayed in user interface, as shown in Figure 5；
3) threshold range (4.538 × 10 stored in the measuring point and database that obtain step 2)-8~7.355 × 10-8Pa) compare, from fig. 5, it can be seen that oxygen gesture stabilization is 6.775 × 10 after the tenth data point-8Pa or so is constant, so as to sentence
Disconnected smelting reaches smelting endpoint.
4) stop electric furnace smelting, pour out molten iron and titanium slag, carry out subsequent smelting operation.
Finishing slag after above-mentioned smelting is subjected to chemical composition analysis, as a result shows TiO2、Ti2O3Total content is about
73.79%, it is seen that the smelting endpoint of smelting titanium slag with electric stove of the present invention judges that system and method can accurately and rapidly judge to smelt
Terminal, so as to obtain production required product.
The above embodiment of the present invention is only example to illustrate the invention, and is not the implementation to the present invention
The restriction of mode.For those of ordinary skill in the art, other can also be made not on the basis of the above description
With the variation and variation of form.Here all embodiments can not be exhaustive.It is every to belong to technical scheme of the present invention
Changes and variations that derived from are still in the row of protection scope of the present invention.
Claims (6)
1. the smelting endpoint judgment method of a kind of smelting titanium slag with electric stove, which is characterized in that whole using the smelting of smelting titanium slag with electric stove
Point judgement system,
The smelting endpoint of the smelting titanium slag with electric stove judges system, including being used for the electric furnace of smelting titanium slag, determining oxygen measurement device, number
According to collector and arithmetic unit；
Rifle and lift actuator including Determining oxygen probe, are surveyed in the top determined oxygen measurement device and be located at the electric furnace；The survey rifle
It is vertically arranged, lower end is connect with the Determining oxygen probe, and upper end is connect with the lift actuator；The lift actuator is used for band
The survey rifle is moved to move back and forth in vertical direction；
The Determining oxygen probe includes high temperature resistant sand body, the detector for examining and determine dense oxygen difference potential and temperature；The resistance to height
Warm sand body in a tubular form, inside be installed with conducting wire, the upper end of the high temperature resistant sand body is provided with connector, for the survey rifle
Lower end formed be detachably connected；The detector is fixed on the lower end of the high temperature resistant sand body；
The detector includes protective case, dense oxygen difference potential detective tube and temperature detective tube；The protective case is opened in one end
Mouthful tubular, blind end is fixed on the lower end of the high temperature resistant sand body, and the openend of the tubular downward and is provided with sealing
Layer, so that the cylindrical interior forms protection chamber；
The dense oxygen difference potential detective tube is additionally provided with perpendicular in the hollow tube shape of sealing in the dense oxygen difference potential detective tube
Straight platinum filament, the lower end of the platinum filament are located at the centre of the dense oxygen difference potential detective tube, and the upper end is pierced by the dense oxygen difference potential
Detective tube, and the conducting wire with being arranged in high temperature resistant sand body is connect；It is also filled with inside the dense oxygen difference potential detective tube
Cr and Cr2O3Powder, as cathode Cr/Cr2O3Reference electrode；The dense oxygen difference potential detective tube is embedded in the sealant
On, the dense oxygen difference potential detective tube top is located in the protection chamber, and lower part is located at outside protection chamber；The temperature inspection
Fixed tube is the U-tube that bending section is arranged below, and the length of a straight tube of the U pipes is more than another, wherein longer straight tube
For long tube, shorter straight tube is short tube；The upper end of the long tube is located in the protection chamber；The upper end of the short tube is fixed on
In the sealant；Thermocouple is provided in the U pipes, one end of the thermocouple is pierced by from the tube wall of short tube and penetrates institute
In the dense oxygen difference potential detective tube stated, link together with the platinum filament；The other end of the thermocouple is worn at the top of long tube
Go out, and the conducting wire with being arranged in high temperature resistant sand body is connect；
The tube body of the dense oxygen difference potential detective tube is ZrO2- CaO is made, and the temperature detective tube is made of boron nitride, institute
The sealant stated is made of aluminium oxide；High temperature resistant cement is filled in the protection chamber；
The survey rifle is hollow pipe, and the data collector determines oxygen spy by the conducting wire being arranged in the hollow pipe with described
Head connection for collecting and recording dense oxygen difference potential information and the temperature information that the Determining oxygen probe measures, and is transmitted to
The arithmetic unit；The arithmetic unit is connect with the data collector, for calculating oxygen gesture, and by its database with arithmetic unit
In information compare, to judge smelting endpoint；
The electric stove tops are equipped with detection conduit, enter to complete calibrating with for the Determining oxygen probe；
The smelting endpoint judgment method of smelting titanium slag with electric stove specifically includes following steps：
1) measuring temperature, dense oxygen difference potential：The 1h before traditional smelting cycle terminates starts lift actuator and drives survey rifle along vertically
Direction is fallen into from detection conduit in electric furnace, and detector is made to be inserted into 200~300mm below slag surface, measures 10 groups or more of temperature
Degree, dense oxygen difference potential information are simultaneously transferred to the data collector, and the data collector, which is collected and recorded, described determines oxygen
The dense oxygen difference potential information and temperature information of measure of popping one's head in simultaneously are transferred to the arithmetic unit；
2) oxygen gesture is calculated：Arithmetic unit with titanium slag oxygen gesture mathematical model to receive each group temperature, dense oxygen difference potential information into
Row Continuous plus is to obtain the titanium slag oxygen gesture value of corresponding number, as measuring point；
3) judge smelting endpoint：By the measuring point that step 2) obtains compared with the threshold range stored in database, when at least 5
When a measuring point continuous-stable is in threshold range, you can judgement reaches smelting endpoint.
2. the smelting endpoint judgment method of smelting titanium slag with electric stove according to claim 1, which is characterized in that the data
Collector is apparatus for determination of oxygen table analysis instrument；The arithmetic unit is computer.
3. the smelting endpoint judgment method of smelting titanium slag with electric stove according to claim 1, which is characterized in that the survey rifle
Outside is coated with CE paper tubes, to protect survey rifle.
4. the smelting endpoint judgment method of smelting titanium slag with electric stove according to claim 1, which is characterized in that institute in step 2)
The formula of titanium slag oxygen gesture mathematical model stated is：
In formula, E is oxygen concentration potential, and unit V is measured by dense oxygen difference potential detective tube；R is gas constant, 8.314J/ (K
mol)；T is thermodynamic temperature, and unit K is measured by temperature detective tube；F is Faraday constant, 96485C/mol；To treat
Survey titanium slag partial pressure of oxygen, i.e. titanium slag oxygen gesture, dimensionless；For cathode Cr/Cr2O3Reference electrode partial pressure of oxygen, by reference electrode material
It determines, is certain value；Pe is electron hole conductive features partial pressure of oxygen.
5. the smelting endpoint judgment method of smelting titanium slag with electric stove according to claim 1, which is characterized in that the calculating formula of Pe
For：
lgPe=-73.63+0.031/T.
6. the smelting endpoint judgment method of smelting titanium slag with electric stove according to claim 1, which is characterized in that step 1) is described
The operation of temperature, dense oxygen difference potential information of the predetermined group number of measure be：When electric furnace in-furnace temperature is 1600 DEG C~1800 DEG C,
It is 15 groups to measure predetermined group number；Surveying start by set date lift actuator drives survey rifle that detector vertically is inserted into slag surface
200~300mm and 7s~9.5s is kept below, then start lift actuator and drive and survey rifle and vertically move upwards, it will
Detector takes out from detection conduit；
Preceding 30min carries out an aforesaid operations at interval of 6min；After 30min, an aforesaid operations are carried out at interval of 3min.
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|---|---|---|---|---|
| CN1451767A (en) * | 2002-04-17 | 2003-10-29 | 广州珠江钢铁有限责任公司 | End point controlling process for smelting low carbon steel in electric furnace |
| CN101348845A (en) * | 2008-08-20 | 2009-01-21 | 攀钢集团钛业有限责任公司 | Method for smelting titanium slag with electric stove |
| CN102634637A (en) * | 2012-05-16 | 2012-08-15 | 中天钢铁集团有限公司 | Operation technology for electric furnace converter |
| CN103866088A (en) * | 2014-03-24 | 2014-06-18 | 莱芜钢铁集团有限公司 | Method for determining amount of slagging material and deoxidized alloy added into LF (Low-Frequency) refining furnace by use of reference heat method |
| CN104962800A (en) * | 2015-07-03 | 2015-10-07 | 共享铸钢有限公司 | Smelting method for stainless steel material |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1451767A (en) * | 2002-04-17 | 2003-10-29 | 广州珠江钢铁有限责任公司 | End point controlling process for smelting low carbon steel in electric furnace |
| CN101348845A (en) * | 2008-08-20 | 2009-01-21 | 攀钢集团钛业有限责任公司 | Method for smelting titanium slag with electric stove |
| CN102634637A (en) * | 2012-05-16 | 2012-08-15 | 中天钢铁集团有限公司 | Operation technology for electric furnace converter |
| CN103866088A (en) * | 2014-03-24 | 2014-06-18 | 莱芜钢铁集团有限公司 | Method for determining amount of slagging material and deoxidized alloy added into LF (Low-Frequency) refining furnace by use of reference heat method |
| CN104962800A (en) * | 2015-07-03 | 2015-10-07 | 共享铸钢有限公司 | Smelting method for stainless steel material |
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