CN106591527A - Production method for hot delivery of shaft furnace oxidized pellets to closed ferrochrome electric furnace - Google Patents
Production method for hot delivery of shaft furnace oxidized pellets to closed ferrochrome electric furnace Download PDFInfo
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- CN106591527A CN106591527A CN201510663073.3A CN201510663073A CN106591527A CN 106591527 A CN106591527 A CN 106591527A CN 201510663073 A CN201510663073 A CN 201510663073A CN 106591527 A CN106591527 A CN 106591527A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B11/00—Making pig-iron other than in blast furnaces
- C21B11/10—Making pig-iron other than in blast furnaces in electric furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
- C22B1/214—Sintering; Agglomerating in shaft furnaces
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a new method for producing and preparing high-carbon ferrochrome, and concretely relates to a production method for hot delivery of shaft furnace oxidized pellets to a closed ferrochrome electric furnace. The method is used for producing the high-carbon ferrochrome, oxidized pellets produced from raw materials for preparing the high-carbon ferrochrome in a shaft furnace are delivered to the closed ferrochrome electric furnace in a hot delivery manner; and the oxidized pellets are sent to a burdening station and are mixed with auxiliary materials, the obtained mixture is sent to a furnace top charging system of the closed ferrochrome electric furnace through a hot delivery feeding device, and the temperature of the oxidized pellets is 300-800 DEG C in the delivery process of the feeding device, so the heat energy of the oxidized pellets is fully used to realize highest efficiency linkage of the shaft oxidized pellets with the closed ferrochrome electric furnace in order to achieve environmental protection and high efficiency purposes.
Description
Technical field
The present invention relates to a kind of new method of production and the preparation of high carbon ferro-chrome, and in particular to a kind of use shaft furnace acid pellet heat delivers to the production method of closed ferrochrome furnace.
Background technology
High carbon ferro-chrome is mainly used in the smelting stainless steels such as AOD, VOD, combined blown converter, and the smelting process of high carbon ferro-chrome has shaft furnace process, electric furnace process, plasma oven process etc..There is a kind of cold production method for delivering to closed ferrochrome furnace of use shaft furnace acid pellet in the world at present, there is energy consumption greatly using the method, the high problem of production cost.
The acid pellet heat that shaft furnace is sintered is sent in ferrochrome furnace the method for carrying out high-carbon chrome iron for smelting, high-carbon chrome alloy is produced, is had not been reported in the world at present, belonged to company and initiate.The method it is important that the technique sent of heat, has the advantages that safety, economy, energy-saving and environmental protection using the method, technological process is smooth, and major economic indicators are reached advanced world standards, it is ensured that the high yield of ferrochrome furnace and efficiently, greatly reduces ferrochrome production cost.
The content of the invention
For effectively solving the problems referred to above, the present invention provides the production method that a kind of use shaft furnace acid pellet heat delivers to closed ferrochrome furnace.
The concrete technical scheme of the present invention is as follows：A kind of use shaft furnace acid pellet heat delivers to the production method of closed ferrochrome furnace, for producing high carbon ferro-chrome, methods described is Jing shaft furnaces after raw and auxiliary material balling-up, acid pellet is sintered under 1100 DEG C or so temperature conditionss, Jing dispensings, then by hot material tank car, direct heat delivers to closed ferrochrome furnace, now pelletizing temperature is between 300 DEG C -800 DEG C, its heat energy is made full use of, linking for shaft furnace acid pellet and the peak efficiency of closed ferrochrome furnace is realized, environment-friendly high-efficiency target is reached.
Further, the production method comprises the steps：
A）The chromium powder ore and bentonite of proper proportion are weighed in proportioning station, chromium powder ore and bentonite is placed in damp mill and is finely ground into powder；
B）The chromium powder ore after powder and bentonite will be finely ground into and be transported in disc balling machine by belt feeder adds moisture content to carry out pelletizing, obtains finished product green pellets；
C）Finished product green pellets is sent in shaft furnace by belt feeder, is sintered green pellets under conditions of 1000-1200 DEG C, the screenings in sintering process is sent back in proportioning station again by belt feeder, forklift, and finished pellet is obtained after sintering；
D）Finished pellet is delivered to into proportioning station dispensing together with auxiliary material, heat is delivered to and smelted in closed ferrochrome furnace, obtain high carbon ferro-chrome；
The auxiliary material includes coke and silica, and heat is sent and mixed with pelletizing at 300 DEG C -800 DEG C of temperature.
Further, the mass ratio of the chromium powder ore, bentonite, coke and silica is 70-80：0.5-2：10-20：3-5.
Further, the acid pellet is first delivered in proportioning station, and after mixing with auxiliary material, then the charging equipment sent by being capable of achieving heat is delivered in the top filling system of closed ferrochrome furnace, in the transmit process of charging equipment, the temperature of the acid pellet is 300-800 DEG C.
Further, the charging equipment includes batch can, and the batch can is sandwich, and inner bag adopts OCr19Ni9, and interlayer is heat-insulated using nanometer heat insulating material, and outer wall is welded using Q345B, and the batch can is provided with guide wheel.
Further, the charging equipment also includes batch can waggon and crane, and the batch can waggon is used to for batch can be transported to hole for hoist from by shots, and the crane is used to for batch can be transported to top filling system.
Further, the top filling system includes furnace top bin, expects pipe, expects pipe insulating suspension and every magnetic cast steel material mouth；
The furnace top bin is arranged on ferrochrome furnace top, and described expects pipe one end connects the furnace top bin, and the other end connects every magnetic cast steel material mouth, and the expects pipe is connected on the upper platform of ferrochrome furnace by expects pipe insulating suspension.
Further, the furnace top bin is welded by Q235B, furnace top bin inside knotting refractory material；
The expects pipe material be 0Cr18Ni9, wall thickness 12mm, the expects pipe outsourcing heat-insulating heat-preserving material；It is described every magnetic cast steel material mouth material be ZG30Cr26Ni5.
Beneficial effects of the present invention are specially：After raw and auxiliary material balling-up, Jing shaft furnaces, acid pellet is sintered under 1100 DEG C or so temperature conditionss, Jing dispensings, then by hot material tank car, direct heat delivers to closed ferrochrome furnace, now pelletizing temperature is between 300 DEG C -800 DEG C, its heat energy is made full use of, linking for shaft furnace acid pellet and the peak efficiency of closed ferrochrome furnace is realized, environment-friendly high-efficiency target is reached.
Description of the drawings
Fig. 1 is the schematic flow sheet of the present invention.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, the present invention is explained in further detail.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, it is not intended to limit the present invention.
Conversely, the present invention covers any replacement, modification, equivalent method and scheme for making in the spirit and scope of the present invention being defined by the claims.Further, in order that the public has a better understanding to the present invention, below to the present invention detailed description in, it is detailed to describe some specific detail sections.For a person skilled in the art without these details the description of part can also completely understand the present invention.
A kind of use shaft furnace acid pellet heat that the present invention is provided delivers to the production method of closed ferrochrome furnace, a kind of preparation system of high carbon ferro-chrome of the method application, the described equipment includes that damp mill, pelletizer, shaft furnace, proportioning station, heat send system and ferrochrome furnace, wherein described damp mill is used to carry out being finely ground into powder by chromium powder ore and bentonite, and add moisture to deliver to carry out in pelletizer pelletizing, the pellet sintering that will be generated under the conditions of 1100 DEG C -1300 DEG C by shaft furnace again, plus other auxiliary materials（Coke, silica etc.）Together after proportioning station mixing, it is delivered in furnace top bin by hot material tank car, finally puts into and carry out in ferrochrome furnace high-carbon chrome iron for smelting, the molten iron and slag for smelting generation periodically flows out, and molten iron delivers to steelshop；Slag is transported outward by automobile.
When using hot material tank car, directly the pelletizing heat of addition coke and silica is delivered to into closed ferrochrome furnace, now pelletizing temperature is between 300 DEG C -800 DEG C, make full use of its heat energy, realize linking for shaft furnace acid pellet and the peak efficiency of closed ferrochrome furnace, environment-friendly high-efficiency target is reached, while Cheng Qian's addition coke and silica are passed through in heat, and it is 70-80 to control the mass ratio of chromium powder ore, bentonite, coke and silica：0.5-2：10-20：3-5, under this proportional quantities, may be implemented in the preliminary mixing of acid pellet, coke and silica during heat is sent, and following technique effect is realized in the preliminary mixing：
Pelletizing surface area is 20-30 with the bonding rate of fines coke：5-8；And 3-5mm in the fines coke infiltration pelletizing surface, pelletizing surface area is 20-30 with the bonding rate of fines silica：1-1.5；And 1-2mm in the fines coke infiltration pelletizing surface, and on the premise of the effect above, smelted in ferrochrome furnace, smelting cost can will be reduced, while accelerating to smelt speed, not only only reach environmental protection.
Specially described ferrochrome furnace includes body of heater, bell, combined electrical pole component, short net, top filling, flue, water-cooling system, hydraulic system, transformer and casthouse equipment etc..
The combined electrical pole is arranged on furnace body inside; the electrode column assembly includes upper and lower two parts; the electrode column assembly top point includes electrode lifting device, Electrode Fluctuation Device, heats component, top carrying cylinder, presses platform and fluid pressure line, and the electrode column assembly bottom point includes bottom carrying cylinder, water-cooled protection screen, contact tube, base ring, contact assembly, high temperature resistant sealing gland backing plate, water-cooled pipeline.
The short net system forms low tension loop with ferrochrome furnace, electric energy required for so as to provide electric furnace smelting, to ferrochrome furnace be powered including three single-phase transformers, the single-phase transformer is connected by short net system with the electrode column, and the short net system includes contact tube, water-cooled cable, watercooling compensator, insulating suspension device, cast copper connector, water cooling plant.Wherein described three single-phase transformers and short net are symmetrical into 120 °.The bell is used to seal burner hearth, reduces heat loss and improve and smelt interval condition of work.The bell includes an antimagnetic central part and an edge part, the edge part encloses puts the anti-magnetic center, the edge part is welded using Q245R, the antimagnetic central part at center is welded using O6Cr18Ni11Ti, the bell is full water cooling formula structure, and bell inner side is coated with refractory material, 13 expects pipe holes, 3 motor holes, 2 furnace pressures is offered on the bell and measures mouth, 2 exhanst gas outlets and safety explosion-proof valve, are additionally provided with motor seal guider on the bell.
The furnace gas produced in stove when the flue is used to produce ferrochrome furnace sends into dust pelletizing system, or when dust pelletizing system occurs abnormal, furnace gas is directly emptied, the water-cooling structure that flue is welded for steel plate.
The water-cooling system is used to that bell, body of heater, electrode system, flue butterfly valve, voltage transformer system, hydraulic system to be carried out the device of water-cooled, the water-cooling system includes 3 water-cooled distributors, each water-cooled distributor feed pipe arranges mechanical compression instrumentation, a thermometer, and arranges thermal resistance in return pipe.
The top filling system includes furnace top bin, expects pipe.
The hydraulic system includes pumping plant, Electrode Fluctuation disk device and executing agency.
The body of heater includes furnace shell, furnace bottom I-steel, plug for outlet, the furnace bottom I-steel is arranged on furnace shell bottom, and the furnace shell is welded by material for Q245R steel plates, and the furnace bottom I-steel is 45b I-steel, the furnace shell is provided with two plug for outlet, furnace shell peripheral hardware furnace wall water-cooling system.
The furnace bottom air cooling equipment, for reducing bottom temperature, to improve the service life of furnace shell and furnace lining, the furnace bottom air cooling equipment includes many Fans and airduct, and the airduct air-out direction is towards the furnace bottom.
The circuit transformer system is powered including three 12000kVA single-phase transformers.
The electrode position indicator, motor position refers to that instrument is relative position of the show electrode in furnace wall.
The casthouse equipment includes outlet dolly, ladle, cinder ladle, stokehold baffle plate, stokehold smoke evacuation system, tap-hole opening and sealing unit.
The charging equipment includes batch can, batch can waggon, 20 tons of electrical bibeam bridge cranes, 3 tons of electric blocks.
The present invention also provides a kind of preparation method of high carbon ferro-chrome, specifically includes following steps：
A）The chromium powder ore and bentonite of proper proportion are weighed in proportioning station, chromium powder ore and bentonite is placed in damp mill and is finely ground into powder.
Wherein chromium powder ore is granularity in below 1mm, and moisture is less than 8%.
Wherein bentonite requires that granularity accounts for more than 95% below 140 microns.
B）The chromium powder ore after powder and bentonite will be finely ground into being transported in disc balling machine by belt feeder carries out pelletizing, obtains finished product green pellets.
C）Finished product green pellets is sent in shaft furnace by belt feeder, is sintered green pellets under conditions of 1100 DEG C or so, the screenings in sintering process is sent back in proportioning station again by belt feeder, forklift, and finished pellet is obtained after sintering.
D）Finished pellet is delivered to into proportioning station dispensing together with auxiliary material, power supply stove is smelted and used, and the dispensing is coke and silica etc..
Claims (8)
1. a kind of use shaft furnace acid pellet heat delivers to the production method of closed ferrochrome furnace, for producing high carbon ferro-chrome, it is characterized in that, methods described is after raw and auxiliary material balling-up, Jing shaft furnaces, acid pellet is sintered under 1100 DEG C or so temperature conditionss, Jing dispensings, pass through hot material tank car again, directly heat delivers to closed ferrochrome furnace, and now pelletizing temperature makes full use of its heat energy between 300 DEG C -800 DEG C, linking for shaft furnace acid pellet and the peak efficiency of closed ferrochrome furnace is realized, environment-friendly high-efficiency target is reached.
2. a kind of use shaft furnace acid pellet heat according to claim 1 delivers to the production method of closed ferrochrome furnace, it is characterised in that the production method comprises the steps：
A）The chromium powder ore and bentonite of proper proportion are weighed in proportioning station, chromium powder ore and bentonite is placed in damp mill and is finely ground into powder；
B）The chromium powder ore after powder and bentonite will be finely ground into and be transported in disc balling machine by belt feeder adds moisture content to carry out pelletizing, obtains finished product green pellets；
C）Finished product green pellets is sent in shaft furnace by belt feeder, is sintered green pellets under conditions of 1000-1200 DEG C, the screenings in sintering process is sent back in proportioning station again by belt feeder, forklift, and finished pellet is obtained after sintering；
D）Finished pellet is delivered to into proportioning station dispensing together with auxiliary material, heat is delivered to and smelted in closed ferrochrome furnace, obtain high carbon ferro-chrome；
The auxiliary material includes coke and silica, and heat is sent and mixed with pelletizing at 300 DEG C -800 DEG C of temperature.
3. a kind of use shaft furnace acid pellet heat according to claim 2 delivers to the production method of closed ferrochrome furnace, it is characterised in that the mass ratio of the chromium powder ore, bentonite, coke and silica is 70-80：0.5-2：10-20：3-5.
4. a kind of use shaft furnace acid pellet heat according to claim 2 delivers to the production method of closed ferrochrome furnace, it is characterized in that, the acid pellet is first delivered in proportioning station, after mixing with auxiliary material, the charging equipment for being sent by being capable of achieving heat again is delivered in the top filling system of closed ferrochrome furnace, in the transmit process of charging equipment, the temperature of the acid pellet is 300-800 DEG C.
5. a kind of use shaft furnace acid pellet heat according to claim 4 delivers to the production method of closed ferrochrome furnace, it is characterized in that, the charging equipment includes batch can, the batch can is sandwich, inner bag adopts OCr19Ni9, interlayer is heat-insulated using nanometer heat insulating material, and outer wall is welded using Q345B, and the batch can is provided with guide wheel.
6. a kind of use shaft furnace acid pellet heat according to claim 5 delivers to the production method of closed ferrochrome furnace, it is characterized in that, the charging equipment also includes batch can waggon and crane, the batch can waggon is used to for batch can be transported to hole for hoist from by shots, and the crane is used to for batch can be transported to top filling system.
7. a kind of use shaft furnace acid pellet heat according to claim 4 delivers to the production method of closed ferrochrome furnace, it is characterised in that the top filling system includes furnace top bin, expects pipe, expects pipe insulating suspension and every magnetic cast steel material mouth；
The furnace top bin is arranged on ferrochrome furnace top, and described expects pipe one end connects the furnace top bin, and the other end connects every magnetic cast steel material mouth, and the expects pipe is connected on the upper platform of ferrochrome furnace by expects pipe insulating suspension.
8. a kind of use shaft furnace acid pellet heat according to claim 7 delivers to the production method of closed ferrochrome furnace, it is characterised in that the furnace top bin is welded by Q235B, furnace top bin inside knotting refractory material；
The expects pipe material be 0Cr18Ni9, wall thickness 12mm, the expects pipe outsourcing heat-insulating heat-preserving material；It is described every magnetic cast steel material mouth material be ZG30Cr26Ni5.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510663073.3A CN106591527A (en) | 2015-10-14 | 2015-10-14 | Production method for hot delivery of shaft furnace oxidized pellets to closed ferrochrome electric furnace |
| PCT/CN2015/095074 WO2017063250A1 (en) | 2015-10-14 | 2015-11-19 | Production method for hot-delivering oxidized pellets in shaft furnace to sealed ferrochrome electric furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510663073.3A CN106591527A (en) | 2015-10-14 | 2015-10-14 | Production method for hot delivery of shaft furnace oxidized pellets to closed ferrochrome electric furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106591527A true CN106591527A (en) | 2017-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510663073.3A Pending CN106591527A (en) | 2015-10-14 | 2015-10-14 | Production method for hot delivery of shaft furnace oxidized pellets to closed ferrochrome electric furnace |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN106591527A (en) |
| WO (1) | WO2017063250A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107177735A (en) * | 2017-06-29 | 2017-09-19 | 江苏省冶金设计院有限公司 | The system and method for producing ferrochrome |
| CN110055453A (en) * | 2019-05-24 | 2019-07-26 | 丰镇市新太新材料科技有限公司 | A kind of smelting process of closed open arc electric furnace high carbon ferro-chrome |
| CN113293282A (en) * | 2021-04-21 | 2021-08-24 | 北京首钢国际工程技术有限公司 | Method for preparing chromium concentrate oxidized pellets by grate rotary kiln and hot charging smelting method |
| CN115109923A (en) * | 2022-03-28 | 2022-09-27 | 中冶东方工程技术有限公司 | High-carbon ferrochrome production system and method |
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| CN112029995A (en) * | 2020-08-09 | 2020-12-04 | 徐州宏阳新材料科技有限公司 | Method for smelting ferrochrome by using ore-smelting furnace added with silica |
| CN113564358A (en) * | 2021-07-27 | 2021-10-29 | 中冶东方工程技术有限公司 | Full manganese powder ore smelting device and method |
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| CN114921648B (en) * | 2022-06-17 | 2023-06-23 | 山西太钢万邦炉料有限公司 | Method for producing high-silicon furnace burden ferrochrome by submerged arc furnace |
| CN115161469A (en) * | 2022-07-21 | 2022-10-11 | 山西太钢万邦炉料有限公司 | Production method of high-proportion south Africa chromium ore pellets |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107177735A (en) * | 2017-06-29 | 2017-09-19 | 江苏省冶金设计院有限公司 | The system and method for producing ferrochrome |
| CN110055453A (en) * | 2019-05-24 | 2019-07-26 | 丰镇市新太新材料科技有限公司 | A kind of smelting process of closed open arc electric furnace high carbon ferro-chrome |
| CN113293282A (en) * | 2021-04-21 | 2021-08-24 | 北京首钢国际工程技术有限公司 | Method for preparing chromium concentrate oxidized pellets by grate rotary kiln and hot charging smelting method |
| CN115109923A (en) * | 2022-03-28 | 2022-09-27 | 中冶东方工程技术有限公司 | High-carbon ferrochrome production system and method |
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| Publication number | Publication date |
|---|---|
| WO2017063250A1 (en) | 2017-04-20 |
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