CN101985697B - Electric furnace charging process for high-titanium blast furnace slag carbonization - Google Patents
Electric furnace charging process for high-titanium blast furnace slag carbonization Download PDFInfo
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Abstract
The invention relates to the field of comprehensive utilization of high-titanium blast furnace slag, and provides an electric furnace charging process for high-titanium blast furnace slag carbonization. The process comprises the following steps of: 1) controlling the blast furnace tapping temperature at over 1,450 DEG C; 2) introducing liquid blast furnace slag into a slag pot car through a slag runner; 3) solidifying the blast furnace slag to form slag crust, and performing sealed heat insulation on the liquid blast furnace slag in the slag pot car; 4) conveying the slag to an electric furnace through the slag pot car for less than or equal to 2 hours; and 5) breaking the slag crust, and guiding the liquid blast furnace slag into the electric furnace through a guide plate and a guide trough. By charging the liquid slag into the furnace, the heat in the blast furnace slag is furthest kept so as to reduce the energy consumption of a blast furnace slag high-temperature carbonization process, reduce the time required for blast furnace slag high-temperature carbonization and smelting and avoid the water resource waste of the conventional water quenching slag; and meanwhile, the process has little modification on the conventional equipment, is easy to implement, and has low implementation cost. The process is suitable for charging of the high-titanium blast furnace slag carbonization.
Description
Technical field
The present invention relates to the comprehensive utilization field of high-titanium blast furnace slag, especially a kind of electric furnace charging technique of high-titanium blast furnace slag carbonization.
Background technology
In the blast furnace ironmaking process of vanadium titano-magnetite, about 80～90% Ti can get into blast furnace slag, and this blast furnace slag is commonly called high-titanium blast furnace slag.The difference of vanadium titano-magnetite proportioning during according to blast-furnace smelting, TiO in the high-titanium blast furnace slag
2Content is different, but usually between 20～29%.With common blast furnace slag is that the tart glassy phase is different basically, and high-titanium blast furnace slag is a kind of very complicated and special system, and staple is Ti, Ca, Si, Al, Mg; Secondly being Fe, V, Mn, P and S etc., is a kind of slag basic, influenced by the mineral composition that fusing points are high in a large number in the slag, crystal property is strong; The vitreous is few; Be the high short slag of a kind of melting temperature, different according to composition and basicity, its melting temperature is between 1200～1400 ℃.
The separation of from high-titanium blast furnace slag, carrying out titanium is a kind of important comprehensive Utilization Ways of high-titanium blast furnace slag.And, at first produce TiC through carbonized high-titanium type blast furnace slag as a kind of important titanium stripping technique, prepare TiCl through the TiC low temperature chlorination again
4, finally through aquation or magnesium reduction TiCl
4Obtain white titanium pigment or Titanium Sponge 40-60 mesh.
The carbonization of high-titanium blast furnace slag is carried out through electric furnace, in electric furnace, with carbonaceous reducing agent blast furnace slag is carried out reduction and carbonization and handles, and titanium is reduced to titanium carbide, and the blast furnace slag after the carbonizing treatment claims to be carbide slag.The carbonization power consumption is higher to be the too high immediate cause of carbide slag production cost, and its electricity charge account for more than 85% of this operation direct production cost.Therefore, melting electric consumption is of paramount importance technical indicator of high temperature cabonization operation and economic target.
Energy expenditure in the electric furnace reduction carbonization blast furnace slag process comprises: fusing and heat up heat absorption, the TiO of ash content in the intensification of the intensification of the cold slag of blast furnace, fusing and liquid slag intensification heat absorption, reductive agent coal and the coal
2With the reduction and carbonization endothermic heat of reaction of carbon and the burning heat release of partial reduction agent carbon etc.See from the energy expenditure of electric furnace reduction carbonization blast furnace slag; Provide the temperature of shove charge blast furnace slag, reductive agent will effectively reduce the energy consumption of carbonation process; Therefore for utilizing blast-furnace cement sensible heat to greatest extent, the imagination that the blast furnace slag of employing molten state carries out liquid hot charging stove is suggested very early.
Liquid hot charging stove also be in molten state when guaranteeing that blast furnace slag is transported to the carbonization workshop, and the electric furnace of can packing into is smoothly smelted; Require blast furnace slag must have good mobility, but in fact high-titanium blast furnace slag is typical short slag, its melting temperature is high; Very easily solidify caking, so electric furnace must build from the very near place of blast furnace in, might realize that just the liquid blast furnace hot charging goes into stove; Limited by objective condition, be difficult to realize.Perhaps can change mobile electric furnace into having slag ladle now; But related facility and the expense that realization produced are difficult to estimate; It is very big to implement difficulty; Therefore increasing cost probably will be far above the cost that utilizes its fusion sensible heat to be reduced, and its complicated affiliated facility is carried out the difficulty that associated maintenance produced also can't neglect.Therefore at present, the enforcement difficulty that the liquid slag hot charging is gone into stove is big.
Summary of the invention
Technical problem to be solved by this invention provides a kind of electric furnace charging technique that can realize the liquid slag shove charge and implement, realize the high-titanium blast furnace slag carbonization that cost is low easily.
The technical solution adopted for the present invention to solve the technical problems is: the electric furnace charging technique of high-titanium blast furnace slag carbonization comprises the steps: 1), control tap cinder temperature is more than 1450 ℃; 2), liquid blast furnace is introduced slag car through slag runner; 3) skull, the slag car liquid towards blast furnace slag that, solidify formation through blast furnace slag carry out airtight insulation; 4), slag is transported to electric furnace, transhipment time≤2 hour through slag car; 5), break skull, through flow deflector and diversion trench liquid blast furnace is imported electric furnace.
Further, before said step 5), electric furnace is carried out preheating, preheating temperature is more than 1200 ℃.
Further, slag runner is uncovered through being provided with the closed with covers of refractory lining said step 2).
Further, said step 5) breaks skull through suspender and weight.
As a kind of preferred, the basicity of said blast furnace slag is controlled at 1.00～1.20.
Further, said skull is solidified by the liquid blast furnace top layer in the slag car and forms.
Further, in step 2) after slag car connect slag and accomplish, be provided with in slag car the evenly step of spreading basic oxide slag making material of blast furnace slag surface; This step is through the even spreading basic oxide slag making material in the surface of blast furnace slag in slag car, and the local basicity that improves blast furnace slag top layer in the slag car is more than 1.2, and the blast furnace slag top layer forms initial skull in slag car.
As a kind of preferred, in the step of the even spreading basic oxide slag making material in the surface of blast furnace slag in slag car, the local basicity on control blast furnace slag top layer is 1.20～1.25, and initial skull thickness is at 1～1.5mm.
As a kind of preferred, the basic oxide slag making material in the step of the even spreading basic oxide slag making material in the surface of blast furnace slag in slag car is MgO.
As a kind of preferred, the composition of blast furnace slag comprises Al by weight percentage
2O
312～14%, MgO 8～10%, TiO
220～25%.
The invention has the beneficial effects as follows: transport at blast furnace slag through skull and slag car and form enclosed space in the process blast furnace slag is incubated, skull has completely cut off liquid slag with slag car and has contacted with the external world, has reduced radiogenic heat, heat loss through convection; Has good heat-insulating property; The transhipment time, by existing slag car, shipment distance was near 50 kilometers in 2 hours; The slag temperature that arrives electric furnace is more than 1300 ℃; When realizing the liquid slag shove charge, little to the existing installation change, implement, realize cost low energy easily.Simultaneously, skull can also play the good protection effect in transport process.The present invention farthest keeps the heat that possesses in the blast furnace slag, thereby can reduce the energy expenditure of blast furnace slag high temperature cabonization technology, reduces the blast furnace slag high temperature cabonization and smelts required time, has avoided the waste of existing Water Quenching Slag to water resources simultaneously.
Embodiment
The electric furnace charging technique of high-titanium blast furnace slag carbonization of the present invention comprises the steps: 1), control tap cinder temperature is more than 1450 ℃; 2), liquid blast furnace is introduced slag car through slag runner; 3) skull, the slag car liquid towards blast furnace slag that, solidify formation through blast furnace slag carry out airtight insulation; 4), slag is transported to electric furnace, transhipment time≤2 hour through slag car; 5), break skull, through flow deflector and diversion trench liquid blast furnace is imported electric furnace.
Slag does not have the fusing point confirmed, and melting temperature refers to that slag is molten into the temperature of liquid phase fully, or begins to separate out the temperature of solid phase during liquid slag cools.Therefore, temperature is the principal element that influences the slag viscosity, and general viscosity raises with temperature and reduces, and wherein short slag is after temperature surpasses the flex point of melting temperature, and viscosity is low but little with variation of temperature.Transport at blast furnace slag through skull and slag car and to form enclosed space in the process blast furnace slag is incubated; Skull has completely cut off liquid slag with slag car and has contacted with extraneous; Reduce radiogenic heat, heat loss through convection; Have good heat-insulating property, skull can also play good safety control effect in transport process.The present invention farthest keeps the heat that possesses in the blast furnace slag, thereby can reduce the energy expenditure of blast furnace slag high temperature cabonization technology, reduces the blast furnace slag high temperature cabonization and smelts required time, has avoided the waste of existing Water Quenching Slag to water resources simultaneously.Simultaneously, present method is changed little to existing installation, implements, realizes cost low energy easily.
According to measuring and calculating, connect the slag temperature at 1450 ℃, the transhipment time is 2 hours, and the slag temperature that arrives electric furnace is more than 1300 ℃, and 1300 ℃ are enough to guarantee under the condition of each basicity, composition, and blast furnace slag is imported electric furnace to the mobile requirement of slag; Simultaneously, by the performance of existing slag car, 2 hours shipment distances are enough on time and space, blast furnace and electric furnace carbonization mated near 50 kilometers, therefore can realize the liquid slag shove charge.
In order to reduce the temperature difference between electric furnace and the liquid blast furnace; Guarantee carrying out smoothly of liquid hot charging stove; The influence that the solidification phenomenon that possibly exist when especially just beginning to import liquid blast furnace imports slag was carried out preheating to electric furnace before said step 5), preheating temperature is more than 1200 ℃.
In order to reduce blast furnace slag is introduced the calorific loss in the slag car process, said step 2) in slag runner uncovered through being provided with the closed with covers of refractory lining.
In the broken shell process, possibly exist the outer of slag to spatter, therefore in order to guarantee operator's safety, said step 5) breaks skull through suspender and weight.
The curve of blast furnace slag viscosity and temperature receives basicity affects, and therefore, except that temperature, also there is influence in the flowability the when basicity of blast furnace slag imports electric furnace to blast furnace slag the most at last.In addition, temperature is low excessively, the too high skull that can cause equally of basicity thickens, and increases the difficulty of broken shell.Therefore, best, in blast furnace ironmaking process, when basicity being controlled, reduce the basicity of slag based on the blast furnace process performance as far as possible.
To the control of blast-furnace smelting state, the slag viscosity is too high, then can not flow smoothly at dropping zone, reduces the voidage of coke skeleton, increases the coal gas resistance, influences smooth operation of furnace; Viscosity is low, the slag of good fluidity helps desulfurization, and viscosity slag big, mobile difference is unfavorable for desulfurization; Phenomenons such as glutinous ditch, cinder notch crust block take place in the too high slag of viscosity, cause the slagging difficulty; The slag that viscosity is high forms slag crust easily in stove, play the protection furnace lining, and viscosity is low excessively, and mobile good excessively slag washes away furnace lining, shortens blast furnace campaign.Therefore, blast-furnace smelting basicity is controlled between 1.0～1.3 usually.In addition, according under different basicity conditions, the relation curve of slag viscosity and temperature, when basicity less than 1.2 the time, the melting temperature of slag is lower, corresponding its viscosity is also lower; Along with the raising of basicity, melting temperature rises, and viscosity also raises.Therefore, in order further to guarantee carrying out smoothly of hot charging stove, avoid melting and warm in naturely be with too highly, guarantee the flowability of blast furnace slag, the flowability when especially arriving electric furnace reduces skull thickness, makes things convenient for broken shell, preferably can control basicity of slag and be less than or equal to 1.2.Therefore, comprehensive blast furnace and the requirement of transhipment to blast furnace slag basicity, best, the basicity of said blast furnace slag is controlled at 1.00～1.20.In the concrete utilization, the selection of basicity is controlled according to the smelting state of blast furnace and is optimized.
Said skull can pass through prefabricated, and after connecing the slag completion, lifts airtight slag car, but operational difficulty, if the long temperature drop that increases blast furnace slag on the contrary of running time.Therefore, best, said skull is solidified by the liquid blast furnace top layer in the slag car and forms.
Said skull can be in transport process be solidified by the liquid blast furnace top layer in the slag car and forms.In order to realize quick crust, further reduce heat and scatter and disappear, in step 2) after slag car connect slag and accomplish, be provided with in slag car the evenly step of spreading basic oxide slag making material of blast furnace slag surface; This step is through the even spreading basic oxide slag making material in the surface of blast furnace slag in slag car, and the local basicity that improves blast furnace slag top layer in the slag car is more than 1.2, and the blast furnace slag top layer forms initial skull in slag car.Can prevent the diffusion of slag making material through even spreading, avoid the influence to below, top layer blast furnace slag basicity, blast furnace slag mobile reduction in top layer has reduced the diffusion of slag making material in slag equally.Basic oxide slag making material can be MgO, BaO, MnO, CaO etc.The minimizing of calorific loss not only helps the liquid hot charging stove of slag, has also avoided crust blocked up, makes things convenient for broken shell.
Blocked up for fear of crust; Reduce the diffusion depth of slag making material; Further avoid influence to the whole basicity of slag, best, in the step of the even spreading basic oxide slag making material in the surface of blast furnace slag in slag car; The local basicity on control blast furnace slag top layer is 1.20～1.25, and initial skull thickness is at 1～1.5mm.Initial skull is not to spread down formation immediately behind the slag making material, and it is also by a process, and above-mentioned initial skull thickness is appreciated that to spreading down behind the slag making material degree of depth that influences to the blast furnace slag top layer.According to the slag volume of initial basicity, target basicity, corresponding initial crust thickness, calculate the amount of the slag making material of every square of required spreading.
When adopting MgO, can make that slag surface crust is rapider through improving the melting temperature that basicity improves slag; MgO can also bring more O into
2-, the polymerization degree of minimizing Si-O, Al-O anion radical reduces viscosity and crust hardness, makes things convenient for broken shell.Therefore, best, the basic oxide slag making material in the step of the even spreading basic oxide slag making material in the surface of blast furnace slag in slag car is MgO.
Under the identical prerequisite of basicity, slag composition is also influential to temperature-vis-cosity curve, and with regard to high-titanium blast furnace slag, its staple comprises CaO, SiO
2, MgO, Al
2O
3, TiO
2, the composition that mainly temperature-vis-cosity curve is impacted comprises MgO, Al
2O
3, TiO
2When basicity is identical, along with TiO
2The increase melting temperature of content raises; MgO is relevant with basicity to the influence of melting temperature; For high-titanium blast furnace slag, along with the increase melting temperature rising of MgO content, but in 6%～10% scope; Influence lessly, and MgO content helped improving the stability and the infusibility of slag at 8～12% o'clock; Al
2O
3Influence degree to melting temperature is same relevant with basicity, along with Al
2O
3The increase melting temperature of content raises, and basicity is less greater than influence in 1.3 o'clock.Therefore, as a kind of scheme of optimum, the composition of blast furnace slag comprises Al by weight percentage
2O
312～14%, MgO 8～10%, TiO
220～25%.
Embodiment
Carried out engineering test in certain factory, comprised the steps:
1), control tap cinder temperature is more than 1450 ℃, basicity is 1.00～1.20, the composition of blast furnace slag comprises SiO by weight percentage
220～25%, Al
2O
312～14%, CaO 26～28%, MgO 8～10%, TiO
220～25%, V
2O
50.3～0.5%, the concrete composition of slag is as shown in table 1;
The composition tabulation of table 1, blast furnace slag
2), liquid blast furnace introduces slag car through slag runner, wherein slag car adopt common ZG30V cast steel slag car through being provided with the closed with covers of refractory lining for slag runner uncovered, the length and width height is of a size of 4300 * 3380 * 2980mm;
After slag car connect the slag completion; The even spreading basic oxide slag making material MgO in the surface of blast furnace slag in slag car; The local basicity that improves blast furnace slag top layer in the slag car is 1.20～1.25; The blast furnace slag top layer forms initial skull in slag car, and initial skull gauge control is 3.5～4.5kg/m at 1～1.5mm according to measuring and calculating MgO addition
2, actual addition is 4 ± 0.5kg/m
2
3), solidify by the liquid blast furnace top layer in the slag car and to form, the skull, the slag car liquid towards blast furnace slag that solidify formation through blast furnace slag carry out airtight insulation;
4), slag is transported to electric furnace, transhipment time≤2 hour through slag car;
5), break skull through suspender and weight, the heavy 3T of broken shell weight, suspender is an electric hoist, through flow deflector and diversion trench liquid blast furnace is imported electric furnace.During stove, before importing slag, carry out preheating headed by the electric furnace, preheating temperature is more than 1200 ℃; During continuous production, guarantee the temperature of electric furnace through the control rhythm of production.
The monitor data of tapping temperature, arrival temperature, shipping time, skull thickness is seen table 2.Temperature all is higher than 1300 ℃, therefore all can satisfy the requirement of liquid hot charging stove to slag fluidity.
The monitored results tabulation of table 2, transport process
Claims (10)
1. the electric furnace charging technique of high-titanium blast furnace slag carbonization comprises the steps:
1), control tap cinder temperature is more than 1450 ℃;
2), liquid blast furnace is introduced slag car through slag runner;
3) skull, the slag car liquid towards blast furnace slag that, solidify formation through blast furnace slag carry out airtight insulation;
4), slag is transported to electric furnace, transhipment time≤2 hour through slag car;
5), break skull, through flow deflector and diversion trench liquid blast furnace is imported electric furnace.
2. the electric furnace charging technique of high-titanium blast furnace slag carbonization as claimed in claim 1 is characterized in that: before said step 5), electric furnace is carried out preheating, preheating temperature is more than 1200 ℃.
3. the electric furnace charging technique of high-titanium blast furnace slag carbonization as claimed in claim 1 is characterized in that: slag runner is uncovered through being provided with the closed with covers of refractory lining said step 2).
4. the electric furnace charging technique of high-titanium blast furnace slag carbonization as claimed in claim 1 is characterized in that: said step 5) breaks skull through suspender and weight.
5. the electric furnace charging technique of high-titanium blast furnace slag carbonization as claimed in claim 1 is characterized in that: the basicity of said blast furnace slag is controlled at 1.00～1.20.
6. like the electric furnace charging technique of claim 1,2,3,4 or 5 described high-titanium blast furnace slag carbonizations, it is characterized in that: said skull is solidified by the liquid blast furnace top layer in the slag car and forms.
7. the electric furnace charging technique of high-titanium blast furnace slag carbonization as claimed in claim 6 is characterized in that: in step 2) after slag car connect slag and accomplish, be provided with in slag car the evenly step of spreading basic oxide slag making material of blast furnace slag surface; This step is through the even spreading basic oxide slag making material in the surface of blast furnace slag in slag car, and the local basicity that improves blast furnace slag top layer in the slag car is more than 1.2, and the blast furnace slag top layer forms initial skull in slag car.
8. the electric furnace charging technique of high-titanium blast furnace slag carbonization as claimed in claim 7; It is characterized in that: in the step of the even spreading basic oxide slag making material in the surface of blast furnace slag in slag car; The local basicity on control blast furnace slag top layer is 1.20～1.25, and initial skull thickness is at 1～1.5mm.
9. the electric furnace charging technique of high-titanium blast furnace slag carbonization as claimed in claim 8 is characterized in that: the basic oxide slag making material in the step of the even spreading basic oxide slag making material in the surface of blast furnace slag in slag car is MgO.
10. the electric furnace charging technique of high-titanium blast furnace slag carbonization as claimed in claim 9 is characterized in that: the composition of blast furnace slag comprises Al by weight percentage
2O
312～14%, MgO 8～10%, TiO
220～25%.
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| CN103014200B (en) * | 2012-03-27 | 2014-05-28 | 新疆八一钢铁股份有限公司 | Process applicable to transfer of molten steel slag of converter and optimization of treatment of hot smouldering slag |
| CN103499215B (en) * | 2013-10-15 | 2015-08-26 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of hot charging device of melting short slag and method |
| CN105950804B (en) * | 2016-07-18 | 2018-07-10 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of blast furnace slag restoring method |
| CN106929631B (en) * | 2017-04-25 | 2019-03-01 | 攀钢集团研究院有限公司 | The dross method that high-titanium blast furnace slag carbonization is smelted |
| CN107663588B (en) * | 2017-10-09 | 2019-07-02 | 攀钢集团研究院有限公司 | A kind of method of melting continuously carbide slag |
| CN107904408A (en) * | 2017-11-13 | 2018-04-13 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of production method for the titanium carbide slag for being used to prepare titanium tetrachloride |
| CN107974521B (en) * | 2017-11-29 | 2019-11-26 | 攀枝花攀钢集团设计研究院有限公司 | High titania type molten blast furnace slag hot charging enters furnace apparatus |
| CN108863045A (en) * | 2018-07-19 | 2018-11-23 | 安徽长江钢铁股份有限公司 | A kind of method of blast furnace slag hot-loading and hot-conveying |
| CN108863041A (en) * | 2018-07-19 | 2018-11-23 | 安徽长江钢铁股份有限公司 | A method of mineral wool and mineral wool board felt are produced using blast-furnace slag |
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| EP1126039A1 (en) * | 2000-02-17 | 2001-08-22 | John A. Vallomy | Method and apparatus for reductively processing the liquid slag and the baghouse dust of the electric arc furnace |
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