CN107794322A - A kind of blast furnace blowing titaniferous furnace retaining material and preparation method thereof - Google Patents
A kind of blast furnace blowing titaniferous furnace retaining material and preparation method thereof Download PDFInfo
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- CN107794322A CN107794322A CN201711103877.3A CN201711103877A CN107794322A CN 107794322 A CN107794322 A CN 107794322A CN 201711103877 A CN201711103877 A CN 201711103877A CN 107794322 A CN107794322 A CN 107794322A
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- titaniferous
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/02—Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
Abstract
The present invention discloses a kind of blast furnace blowing titaniferous furnace retaining material and preparation method thereof, and the grain size distribution of the titaniferous furnace retaining material is：Mesh≤10% of 90%≤325 mesh≤100%, 0≤400；Including following components：In terms of weight/mass percentage composition, including 52%~55% TiO2,30%~32% TFe and a small amount of impurity；In the impurity, including weight/mass percentage composition<2.0% SiO2, weight/mass percentage composition<0.03% S, weight/mass percentage composition<0.004% P, surplus are other impurity.The titaniferous furnace retaining material can be achieved uniformly to mix with coal dust during titanium furnace retaining is sprayed through blast furnace, fluidizing velocity is consistent, after being mixed with coal dust during by gas transport segregation-free phenomenon, be greatly saved the cost of blast furnace blowing furnace retaining, there is considerable economic benefit and value.
Description
Technical field
The invention belongs to blast furnace protecting technical field, and in particular to one kind utilizes titaniferous used during blast furnace injection furnace retaining
Furnace retaining material and preparation method thereof, produce a kind of suitable blast furnace blowing furnace retaining titaniferous furnace retaining material.
Background technology
It is the major hidden danger for threatening blast fumance safety that blast furnace crucibe, furnace bottom, which corrode, while is to determine the generation life of the blast furnace
Principal element.Cupola well abnormal erosion at home and abroad blast furnace generally existing, and effectively control the abnormal erosion of blast furnace crucibe into
For the important technology research objective of world's Iron industry.
Conventional at present to add the method for titanium furnace retaining mainly to have two kinds using blast furnace, one kind is to add titanium ore or titaniferous ball from furnace roof
Group, one kind is from tuyere feeding.Although both approaches can realize plus the purpose of titanium furnace retaining, certain lack all be present
Fall into.From furnace roof plus titanium ore or titaniferous pelletizing when, cause blast fumance index decline, be unfavorable for smooth operation of furnace.And from tuyere feeding
Furnace retaining then needs special wire-feeding device comprising straightening wire-leading device, increases production cost, while there is also certain potential safety hazard for the process of line feeding.
Chinese patent CN102115798A provides a kind of method that high coal powder injection is blown furnace retaining with addition of schreyerite powder, this method
Powdery vanadium titanium material is continuous, uniform with being added in raw coal, using coal powder injection facility powder and injection system, conveyed by coal dust
Pipeline, after pulverized coal distributor distributes, the coal powder lance that powdery vanadium titanium material is inserted from blast-furnace tuyere belly pipe sprays into State of Blast Furnace
Cylinder.This method partly solves the defects of adding titanium ore and tuyere feeding furnace retaining by furnace roof, but there is also it is following the problem of：(1)
The hardness of titanium dioxide is larger, can not grind schreyerite powder in coal pulverizer, and coal pulverizer can be caused to damage；(2) due to vanadium titanium
The heap density (being about 2.5t/m3) of miberal powder differs larger with the heap density (being about 0.5t/m3) of coal dust, if schreyerite powder
Granularity it is larger, with easily causing coal pulverizer to tell powder in coal dust mixed process in coal pulverizer, and in subsequent schreyerite powder
Will also result in the component segregation of compound after being mixed with coal dust in course of conveying can not ensure to mix the stabilization of meal component, therefore need
Calculate titanium fine powder granularity similar in suitable and pulverized coal particle quality.
There is document it is proposed that carrying out injection furnace retaining with granularity for the titanium fine powder of -200 mesh, but we demonstrate,prove by industrial experiment
Bright, when the titanium fine powder of this granularity is blown after being mixed with coal dust, the component segregation of compound is serious.Phase after injection terminates
Work as following period of time, after testing, a certain amount of titanium fine powder is still contained in coal dust, it is total that residual titanium fine powder quantity reaches addition titanium fine powder
The 30% of amount.And when carrying out injection furnace retaining using the titanium fine powder of -200 mesh, at the turning of injection pipeline, particularly distribute
There is pipeline branch pipe elbow by the phenomenon of mill leakage after device.
The content of the invention
It is an object of the invention to provide one kind to utilize titaniferous furnace retaining material used during blast furnace injection furnace retaining and its preparation
Method, the titaniferous furnace retaining material can be achieved uniformly to mix with coal dust during titanium furnace retaining is sprayed through blast furnace, and fluidizing velocity is consistent, with coal
Powder mixing after during by gas transport segregation-free phenomenon, be greatly saved the cost of blast furnace blowing furnace retaining, have it is considerable
Economic benefit and value.
In order to achieve the above object, concrete technical scheme of the invention is as follows：
A kind of blast furnace blowing titaniferous furnace retaining material, the grain size distribution of the titaniferous furnace retaining material are：90%≤- 325 mesh≤
100%, 0≤- 400 mesh≤10%；
Including following components：In terms of weight/mass percentage composition, including 52%~55% TiO2,30%~32% TFe and
A small amount of impurity；In the impurity, including weight/mass percentage composition<2.0% SiO2, weight/mass percentage composition<0.03% S, quality
Percentage composition<0.004% P, surplus are other impurity.
Further, including following components：In terms of weight/mass percentage composition, including 53%~54% TiO2,31%~
32% TFe and a small amount of impurity；In the impurity, including the SiO2 of weight/mass percentage composition≤1.8%, weight/mass percentage composition≤
0.02% S, the P of weight/mass percentage composition≤0.035%.
Further, the grain size distribution of the titaniferous furnace retaining material is -325 mesh.
Present invention also offers the method for preparing the blast furnace blowing titaniferous furnace retaining material, comprise the following steps:
A. 70%~80% ilmenite concentrate is mixed in proportion with 20%~30% PTZ74 titanium slags；
B. well mixed ilmenite concentrate and PTZ74 titanium slags are added in the raymond mill of Europe version, regulates parameter progress
Grinding, sieves after grinding, and granularity is -325 targeted fine powders under collection screen, and the coarse granule on sieve goes successively to flour mill and ground
Mill, the final titaniferous furnace retaining material for the mesh of 90%≤- 325 targeted fine powder contents≤100%, 0≤- 400 coarse powder content≤
10%.
Further, in step a, TiO2 contents >=47%, TFe content is 34%-36% in the ilmenite concentrate.
Further, in step a, TiO2 content >=74% in the PTZ74 titanium slags.
Further, in step a, when the ilmenite concentrate is mixed with the PTZ74 titanium slags, mixed, mixed using mixing machine
The conjunction time is 25-30 minutes, and the rotating speed for controlling mixing machine is 15r/min.
A kind of titaniferous furnace retaining material of the blast furnace blowing provided by the invention disclosed in titaniferous furnace retaining material and preparation method thereof, its
Grain size distribution is mesh≤10% of 100% >=-325 mesh >=90%, 0≤- 400.The final size that coal dust is ground in coal pulverizer
Typically in -200 mesh or so, and this titaniferous furnace retaining material will not be ground due to higher fineness after being mixed with coal dust in coal pulverizer
Mill, that is, grinding will not be caused to bear to coal pulverizer, and will be contained in titaniferous furnace retaining material just with the high temperature in coal pulverizer
Moisture drying, and mix, coal pulverizer will not be caused damage with coal blending.
According to the conventional thought and means of those skilled in the art, minimum -200 mesh of granularity of pulverized coal injection in blast furnace, and
And those skilled in the art would generally formulate the granularity of titaniferous furnace retaining material according to grind size of the coal dust in coal pulverizer, institute
So that the granularity of usual titaniferous furnace retaining material can also be less than -200 mesh.Typically, since ilmenite concentrate in process of lapping, often improves one
Grain size distribution, required milling time and grinding cost can increase by 40%, so, in order to avoid improving titaniferous furnace retaining material
Prepare cost, it will usually which the grain size distribution for preparing titaniferous furnace retaining material is more than -200 mesh.
And found according to the practical studies of the present inventor, by calculating, though when the grain size distribution of titaniferous furnace retaining material reaches-
325 mesh, it, which grinds cost, only increases by 295 yuan/ton, and even if carrying out injection furnace retaining using granularity for the titanium fine powder of -200 mesh, pass through
Crossing industrial experiment proves, when the titanium fine powder of this granularity is blown after being mixed with coal dust, even if than being improved during normal coal injection
About 15% grinding machine heat smoke flow, 10% injection wind flow, jetting pressure add about 5%, compound into
Divide segregation still serious.In quite a while after injection terminates, after testing, still containing a certain amount of titanium essence in coal dust
Powder, residual titanium fine powder quantity, which reaches, adds the 30% of titanium fine powder total amount.And carrying out injection furnace retaining using the titanium fine powder of -200 mesh
When, at the turning of injection pipeline, there is pipeline branch pipe elbow by the phenomenon of mill leakage particularly after distributor.So not only these
Raw material availability is relatively low, and the blocking of coal spraying pipeline can be caused if the titanium fine powder of -200 mesh of injection for a long time, influences blast furnace
Normal production, is calculated by present profit, per one ton of molten iron of the underproduction, then can cause 1000 yuan or so of loss.
Comparatively speaking, titaniferous furnace retaining material provided by the invention is ground to after grain size distribution reaches -325 mesh, not only
Deposition and segregation phenomena will not be produced during injection is blended in coal dust, while will not more be made for blast furnace blowing equipment
Into infringement
Because after grain size distribution reaches -325 mesh, injection wind flow, wind speed and the jetting pressure of blast furnace hole injection with just
Compared during normal coal injection without increase, it becomes possible to by the injection completely of the titaniferous furnace retaining material of the grain size distribution to kicking up, and filled
Divided combustion reacts, and occurs reduction reaction with carbon, nitrogen in blast-furnace tuyere and bottom slag iron layer, generation high melting compound Ti (C,
N) it is dissolved in molten iron, increases molten iron viscosity, mobility reduces.Ti (C, N) is crystallized in the form of solid solution at hearth erosion
Separate out, form the beds of precipitation, and then protect the purpose of cupola well.
- 325 mesh or so are should be corresponding to the granularity of titaniferous furnace retaining material of coal suitable for blowing powder particles quality when consistent, and are worked as
When titaniferous furnace retaining material granularity is less than -400 mesh, then mill hourly output can be reduced, prepare the power consumption rise of titanium valve, meaningless increasing
Powder cost is added, and meticulous granularity can cause furnace retaining material easily to rise in blast furnace with blast furnace gas, be attached to furnace charge surface,
It is unfavorable to blast furnace natural labor.
During spraying titanium furnace retaining, normally produced with blast furnace for coal injection system equipment attrition degree consistent during coal injection.
After blast furnace is entered, this titaniferous furnace retaining material is to the fire behaviour, burn rate characteristics, burn-off rate of coal dust, air port Theoretical combustion temperature
Degree is without influence.And the titanium burden requirement as needed for blast furnace protecting, it is targetedly, timely, safety by this titaniferous furnace retaining material
Blast furnace is sprayed into through coal powder lance by blast-furnace tuyere with coal dust, reaches the purpose of furnace retaining.
Embodiment
Embodiments of the present invention are illustrated below.
A kind of blast furnace blowing titaniferous furnace retaining material, the grain size distribution of the titaniferous furnace retaining material are：The titaniferous furnace retaining material
Grain size distribution is：Mesh≤10% of 90%≤- 325 mesh≤100%, 0≤- 400；
Including following components：In terms of weight/mass percentage composition, including 52%~55% TiO2,30%~32% TFe with
And a small amount of impurity；In the impurity, including weight/mass percentage composition<2.0% SiO2, weight/mass percentage composition<0.03% S, matter
Measure percentage composition<0.004% P, surplus are other impurity.
The component of titaniferous furnace retaining material can also be made up of following：In terms of weight/mass percentage composition, including 53%~54%
TiO2,31%~32% TFe and a small amount of impurity；In the impurity, including the SiO2 of weight/mass percentage composition≤1.8%, quality
The S of percentage composition≤0.02%, the P of weight/mass percentage composition≤0.035%, surplus are other impurity.
In order to reach optimum efficiency, the grain size distribution of the titaniferous furnace retaining material preferably used in the present invention is-the 325 of 100%
Mesh fine powder.
Present invention also offers the method for preparing the blast furnace blowing titaniferous furnace retaining material, comprise the following steps:
A. 70%~80% ilmenite concentrate is mixed in proportion with 20%~30% PTZ74 titanium slags；, wherein, institute
State TiO2 content >=74% in PTZ74 titanium slags.When the ilmenite concentrate is mixed with the PTZ74 titanium slags, mixed using mixing machine,
Incorporation time is 25-30 minutes, and the rotating speed for controlling mixing machine is 15r/min.
B. well mixed ilmenite concentrate and PTZ74 titanium slags are added in the raymond mill of Europe version, regulates parameter progress
Grinding, sieves after grinding, and granularity is -325 targeted fine powders under collection screen, and the coarse granule on sieve goes successively to flour mill and ground
Mill, the final titaniferous furnace retaining material for the mesh of 90%≤- 325 targeted fine powder contents≤100%, 0≤- 400 coarse powder content≤
10%.
The titaniferous furnace retaining material developed the present invention be directed to blast furnace blowing furnace retaining, this titaniferous furnace retaining material have following advantage：
Fine grain size distribution is small to equipment attrition, and fluidizing velocity and blast furnace injection coal powder are basically identical, the suitable remote gas of blast furnace
Body conveys；Specific surface area, which doubles, more fully to chemically react；Efficient Ti (C, N) compound formation mechanism causes
Injection amount titanium amount adds titanium amount to reduce 60%~70% than furnace roof, reduces 28.6%~34.8% into the TiO2 in clinker, drop
Low-fuel ratio 2.2%~2.3%, raising gas utilization rate 3.5%~5.6%, reduction add titanium furnace retaining by furnace roof and enter blast furnace
Interior alkali metal amount 60%~70%.
The many blast furnaces in China have been carried out normalization furnace retaining operation at present, through preliminary benefit accounting, currently to produce raw material
Calculation of price, titanium ore than furnace roof added using spray titanium furnace retaining during blast furnace protecting or titanium ball furnace retaining ton iron cost reduce by 15.8 yuan-
16.2 yuan.China's pig iron annual production at present is 700,000,000 tons, wherein about 100,000,000 tons of the pig iron is to add titanium ore or titanium ball in blast furnace roof
Produced in the case of furnace retaining, be such as changed to reach -325 targeted fine powder furnace retaining material using grain size distribution provided by the invention and
The method of row spray titanium furnace retaining, annual production cost reduce at least 15~1,600,000,000 yuan.
The method that the quick furnace retaining of titanium is sprayed by air port is realized using bf coal injection system, in a 2500m3On level blast furnace, reach
During to furnace retaining effect, it is 10kg/t that titanium load during titanium ore need to be added by furnace roof.After stopping adds titanium ore 24 hours by blast furnace roof, by
Blast-furnace tuyere sprays into titanium fine powder by different titanium loads and checks implementation result.
Embodiment 1
It is -325 mesh >=90% by the granularity of titaniferous furnace retaining material, -400 mesh≤10%；TiO2Weight/mass percentage composition be
52%；TFe weight/mass percentage composition is 32%；SiO2Weight/mass percentage composition be<2.0%, S weight/mass percentage composition is<
0.03%, P weight/mass percentage composition is<0.003%, it is hoisted to special blending bunker；
After adding titanium ore to carry out furnace retaining operation one week by blast furnace roof, stop plus titanium ore will after 24 hours, 24 hours
This titaniferous furnace retaining material by the feeder of orlop by titaniferous furnace retaining material by titanium load by 1kg/t, increase 1kg daily, until plus
To 4kg/t proportioning, it is added on coal belt, raw coal bunker of coal mill is entered together with raw coal；
Titaniferous furnace retaining material enters coal mill system by run coal bin, and the moisture in titanium fine powder is utilized in coal pulverizer in coal pulverizer
Temperature is oven-dried, while titanium fine powder is realized with the rotation of coal pulverizer and mixed with the uniform of coal dust, finally enters coal dust with coal dust
Storehouse；
Titanium fine powder is sprayed into blast furnace with coal dust through air port using injection system；It is existing blast furnace need not to be changed during injection
Injection system parameter, and check that each injection pipeline has situation without exception at any time.
Sprayed being realized using bf coal injection system by air port in the 6 day time of the quick furnace retaining of titanium, the work of blast furnace items of equipment
Normally, pipeline and coal powder lance after 12 hours of injection are stopped, taking without damage phenomenon at blast furnace tuyere platform coal spraying pipeline
Pulverized coal sample is chemically examined, and result of laboratory test show, do not have the blast furnace blowing titaniferous furnace retaining material presence additionally added in coal dust, it was demonstrated that reality
The blast furnace blowing for applying the offer of example 1 blows into blast furnace with the pulverized coal injection before the whole companions of titaniferous furnace retaining material, not in blast furnace blowing
Deposited in pipeline.
Theoretical temperature combustion is 2100 degree or so compared with furnace roof adds titanium ore before air port, is not reduced.In molten iron
[Ti] added by stopping furnace roof after titanium ore 24 hours 0.06% gradually increase, when the titanium load that titanium is sprayed by air port reaches 3kg/
During t, [Ti] is stable more than 0.10% in molten iron, and major part alreadys exceed 0.12%；And when the titanium load of air port spray titanium reaches
During to 4kg/t, [Ti] is stable more than 0.15% in molten iron, and maximum reaches 0.17%, and titanium ore titanium load has been added with furnace roof
For 10kg/t when result it is identical.In the 6 day time of air port spray titanium, titanium also commercial weight substantially increases, the average titaniferous amount of clinker by
Furnace roof adds 2.31% during titanium ore furnace retaining to drop to 1.50%, and cupola well part water temperature difference is controlled within 0.6 DEG C, electric thermo-couple temperature
Control has reached the effect of blast furnace protecting within 400 DEG C.Titanium ore furnace retaining is added to contrast in spray titanium furnace retaining and furnace roof simultaneously, blast furnace
Coal gas average utilization improves 4.9%, averagely produces iron increase 217.5t/d daily, and coke ratio reduces 14.4kg/t, and coal is than rise
2.80kg/t, fuel ratio reduce 11.5kg/t.
Embodiment 2
It is -325 mesh >=90% by the granularity of titaniferous furnace retaining material, -400 mesh≤10%；TiO2Weight/mass percentage composition be
55%；TFe weight/mass percentage composition is 30%；SiO2Weight/mass percentage composition be<2.0%, S weight/mass percentage composition is<
0.03%, P weight/mass percentage composition is<0.003%, it is hoisted to special blending bunker；
After embodiment 1, stop feeder of the spray titanium after 24 hours, 24 hours by the titaniferous furnace retaining material of this proportioning by orlop
Directly start by titanium load 4kg/t, be added on coal belt, raw coal bunker of coal mill is entered together with raw coal；
Titaniferous furnace retaining material enters coal mill system by run coal bin, and the moisture in titanium fine powder is utilized in coal pulverizer in coal pulverizer
Temperature is oven-dried, while titanium fine powder is realized with the rotation of coal pulverizer and mixed with the uniform of coal dust, finally enters coal dust with coal dust
Storehouse；
Titanium fine powder is sprayed into blast furnace with coal dust through air port using injection system；
The existing injection system parameter of blast furnace need not be changed during injection, and it is without exception to check that each injection pipeline has at any time
Situation.
Realizing that the titaniferous furnace retaining material matched by tuyere injection embodiment 2 carries out quick furnace retaining using bf coal injection system
In 6 day time, blast furnace items of equipment is working properly, and pipeline and coal powder lance are without damage phenomenon, after 12 hours of injection are stopped,
Pulverized coal sample is taken to chemically examine at blast furnace tuyere platform coal spraying pipeline, result of laboratory test is shown, does not have the blast furnace spray additionally added in coal dust
Blow and exist with titaniferous furnace retaining material, it was demonstrated that coal of the blast furnace blowing before the whole companions of titaniferous furnace retaining material that embodiment 2 provides
Powder is blown into blast furnace, is not deposited in blast furnace blowing pipeline.
And in 6 days of the titaniferous furnace retaining material furnace retaining that tuyere injection embodiment 2 provides, theoretical temperature combustion and stove before air port
Top plus titanium ore are not substantially reduced compared to being kept at 2100 degree or so, (TiO in [Ti] and clinker in molten iron2) relative to reality
Apply example 1 to be increased slightly, [Ti] is stable more than 0.15% wherein in molten iron, and maximum reaches 0.18%, has reached furnace roof
Result when adding titanium ore titanium load to be 10kg/t.In this period of air port spray titanium, titanium also commercial weight substantially increases, clinker titaniferous
Amount adds 2.31% during titanium ore furnace retaining to drop to 1.51% by furnace roof, and cupola well part water temperature difference is controlled within 0.6 DEG C, thermocouple
Temperature control has reached the effect of blast furnace protecting within 400 DEG C.Titanium ore furnace retaining is added to contrast in spray titanium furnace retaining and furnace roof simultaneously,
Blast furnace gas average utilization improves 4.2%, averagely produces iron increase 217.1t/d daily, and coke ratio reduces 14.2kg/t, coal ratio
2.91kg/t is raised, fuel ratio reduces 11.2kg/t.
More than, although the description of several embodiments of the invention, but these embodiments are intended only as example proposition
, it is not intended to limit the scope of the present invention.For these new embodiments, can be implemented in a manner of other are various,
In the range of idea of the invention is not departed from, various omissions, displacement and change can be carried out.These embodiments and its change
Shape, the invention being also contained in described in claims while being contained in scope and spirit of the present invention and its impartial model
In enclosing.
Claims (7)
1. a kind of blast furnace blowing titaniferous furnace retaining material, it is characterised in that the grain size distribution of the titaniferous furnace retaining material is：90%≤-
Mesh≤10% of 325 mesh≤100%, 0≤- 400；
Including following components：In terms of weight/mass percentage composition, including 52%~55% TiO2,30%~32% TFe and few
Measure impurity；In the impurity, including weight/mass percentage composition<2.0% SiO2, weight/mass percentage composition<0.03% S, quality hundred
Divide content<0.004% P, surplus are other impurity.
2. blast furnace blowing according to claim 1 titaniferous furnace retaining material, it is characterised in that including following components：With quality
Percentage composition meter, including 53%~54% TiO2,31%~32% TFe and a small amount of impurity；In the impurity, including matter
Measure the SiO2 of percentage composition≤1.8%, the S of weight/mass percentage composition≤0.02%, the P of weight/mass percentage composition≤0.035%, surplus
For other impurity.
3. blast furnace blowing according to claim 1 or 2 titaniferous furnace retaining material, it is characterised in that the titaniferous furnace retaining material
Grain size distribution is -325 mesh.
4. prepare the method for the blast furnace blowing titaniferous furnace retaining material described in claim 1, it is characterised in that comprise the following steps:
A. 70%~80% ilmenite concentrate is mixed in proportion with 20%~30% PTZ74 titanium slags；
B. well mixed ilmenite concentrate and PTZ74 titanium slags are added in the raymond mill of Europe version, regulate parameter and be ground,
Sieved after grinding, granularity is -325 targeted fine powders under collection screen, and the coarse granule on sieve goes successively to flour mill and is ground, finally
The titaniferous furnace retaining material for the mesh of 90%≤- 325 targeted fine powder contents≤100%, 0≤- 400 coarse powder content≤10%.
5. the blast furnace blowing according to claim 4 preparation method of titaniferous furnace retaining material, it is characterised in that in step a, institute
It is 34%-36% to state TiO2 contents >=47%, TFe content in ilmenite concentrate.
6. the blast furnace blowing according to claim 4 preparation method of titaniferous furnace retaining material, it is characterised in that in step a, institute
State TiO in PTZ74 titanium slags2Content >=74%.
7. the blast furnace blowing according to claim 4 preparation method of titaniferous furnace retaining material, it is characterised in that, will in step a
When the ilmenite concentrate mixes with the PTZ74 titanium slags, mixed using mixing machine, incorporation time is 25-30 minutes, controls mixing machine
Rotating speed be 15r/min.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108559813A (en) * | 2018-06-08 | 2018-09-21 | 北京科技大学 | A kind of titaniferous material furnace retaining Economic Evaluation model |
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