CN102899438A - Reducing furnace used for producing direct reduction iron - Google Patents
Reducing furnace used for producing direct reduction iron Download PDFInfo
- Publication number
- CN102899438A CN102899438A CN2012104152521A CN201210415252A CN102899438A CN 102899438 A CN102899438 A CN 102899438A CN 2012104152521 A CN2012104152521 A CN 2012104152521A CN 201210415252 A CN201210415252 A CN 201210415252A CN 102899438 A CN102899438 A CN 102899438A
- Authority
- CN
- China
- Prior art keywords
- iron
- direct
- furnace
- heater
- reduced iron
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 229910052742 iron Inorganic materials 0.000 title abstract description 32
- 238000010438 heat treatment Methods 0.000 claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000009413 insulation Methods 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000006722 reduction reaction Methods 0.000 claims description 36
- 238000009434 installation Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 3
- 239000003245 coal Substances 0.000 abstract description 13
- 230000002829 reductive effect Effects 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 6
- 239000003638 chemical reducing agent Substances 0.000 abstract description 5
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 230000009970 fire resistant effect Effects 0.000 abstract description 3
- 239000007787 solid Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 35
- 229910000831 Steel Inorganic materials 0.000 description 16
- 239000010959 steel Substances 0.000 description 16
- 239000007789 gas Substances 0.000 description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 7
- 238000011161 development Methods 0.000 description 6
- 239000003345 natural gas Substances 0.000 description 5
- 235000009508 confectionery Nutrition 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 206010011416 Croup infectious Diseases 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 235000003599 food sweetener Nutrition 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007363 ring formation reaction Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000003765 sweetening agent Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Images
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a reducing furnace used for producing direct reduction iron. The reducing furnace structurally comprises a furnace body, and is characterized in that the outer wall of the furnace body is a fire resistant insulation layer (5), a heating plate (7) is arranged in the fire resistant insulation layer (5), and the heating plate (7) is connected with a conductive device (3); a feed inlet (4) is arranged at the top of the furnace body, and a discharge hole (1) is arranged at the bottom of the furnace body. According to the invention, after iron ores and moderate carbon (as a reducing agent) in any grade and shape are mixed, the solid state is directly reduced to sponge iron through the reducing furnace. According to the reducing furnace provided by the invention, restriction on the grade of the iron ores, and the quality and the grade of coal mine is removed, and the reducing furnace has the advantages of abundant materials, simple structure, reliable technology, excellent environmental-friendly performance, and capability of greatly reducing the production cost, in particular improving the additional value in a production process.
Description
Technical field
The present invention relates to a kind of direct-reduced iron production reduction furnace, belong to the direct-reduced iron processing technique field.
Background technology
China's Iron And Steel Industry develops rapidly, has become in the world first to produce steel big country and consumption steel big country.Output of steel was broken through 700,000,000 tons in 2011, year needs more than 9,000 ten thousand tons of steel scraps, the reduced iron demand is 5,000,000 tons (wherein the import reduced iron is more than 400 ten thousand tons), but the output of China's direct-reduced iron is not as good as the output of India's two weeks, cause the direct-reduced iron of Iron And Steel Company that a large amount of breach is arranged, a large amount of external direct-reduced irons of import of the flower high price of having to.Therefore, China is not iron and steel power, and steel products do not have competitive power in the international market, aspect rolling shapes and quality, also are not suitable with the requirement of the national economic development.China also will reach more than 4,000 ten thousand tons of imported steels (mainly being high-quality steel and special steel) from external every year, and sponge iron solves the unique indispensable starting material of high-quality steel and special steel just.And the direct-reduced iron of China (sponge iron) annual production only is 600,000 tons, and world's metallurgy industry is decided to be zero to the sponge iron output of China.China is again the abundant country of a Sweet natural gas and coking coal reserves, in addition poor, thin, the assorted iron ore deposit of China, and direct-reduced iron can not form mass-producing always.Therefore, country puts into effect relevant policies, encourage growth direct-reduced iron and the technological development of Fei Jiao iron-smelting process and application.Improve a large amount of poor, thin, assorted iron ore deposit and iron-containing waste and the abundant coal resources of quantity and quality and exploitation China of reduced iron, making its resource utilization is an extremely urgent cause.
Direct-reduction technique difference according to the use reductive agent in the world's can be divided into two large classes: use the gas base directly reducing method of gaseous reducing agent and the coal-based direct reduction method of use solid reductant.In the process of moving towards iron and steel power, the sponge iron industry of national resource feature is based oneself upon in development, be only the only way which must be passed of development iron and steel power, the gas base directly reducing method, mainly be distributed in the abundant area of the natural gas sources such as the Middle East, South America, these areas also obtain fast development take the short flow process of electric furnace as main Iron And Steel Industry.Representing technique is Midrex shaft furnace process, HYL retort process making sponge iron and fluidized bed process.The coal-based direct reduction method mainly is distributed in the ground such as South Africa, India, New Zealand, and natural gas source is limited, but iron ore deposit and the abundant coal resources of high-quality are arranged.Represent technique SL-RN method and Krupp method are arranged.
China is from energy reserve and rationally utilize consideration, can't provide enough Sweet natural gases for metallurgical industry production, even there is gas available, cost is high too, produces one ton of sponge iron, if want 400-500m with Sweet natural gas
3If, use coal gas, 1600m
3Therefore gas base directly reducing can't be considered.Use at home more technique that three kinds of tunnel furnace technique, rotary kiln technology and down-draft kiln techniques are arranged, be the coal base reduction method, the research experiment of some other techniques has also been done by more domestic units, does not all obtain the success that industrialness is produced.Thereby coal-based method production sponge iron technique is the first-selected technique of China.
Down-draft kiln in China's development early, its characteristics have: less investment, upper detective, cost is low, scale is flexible, simple to operate, starting material are required low, but its poor product quality and unstable, production efficiency is low, energy consumption is high, labour intensity is large, operating environment is poor, environmental pollution is serious, equipment is backward, total man worker's operation, machinery-freeization can be sayed, but using because its less investment also has some small business, country does not advocate use.
The rotary kiln technology characteristics: mechanization degree is higher, operating environment, pollute gentlyer, but also exist this that product cost is high, investment is large, be easy to occur the ring formation fault, quality product is lower, stacking factor low (generally 10%-20%), the division in product rate is high.Raw material and reductive agent are required harsh, the shortcoming such as production efficiency is lower, and thermo-efficiency is low has several to use at home, but all not too successful.
Traditional tunnel furnace technique must adopt expensive fire-resistant can, technique is backward, energy consumption is high, and (direct-reduced iron per ton will consume 500-650 ㎏ reduction coal, also to consume 450-550 ㎏ heating coal), the recovery time grow (48-76h), the labor force consumes high, unstable product quality, the production run cost is high, slack market, this technique also exist environmental pollution serious (solid waste such as reduction coal ash, useless reduction tank are many, dust is many), to shortcomings such as ingredient requirements too high (TFe 〉=66%).
Above-mentioned all direct-reduced iron technology both domestic and external all can't utilize low grade ore, powder and iron-containing waste direct-reduction to go out high-grade reduced iron product.
Summary of the invention
The object of the invention is to, a kind of direct-reduced iron production reduction furnace is provided.In China's low-grade iron ore resource and enrich on the basis of coal resources, after lump ore, powder and an amount of reductive agent of any grade being mixed, become sponge iron through the reduction furnace direct-reduction.
Technical scheme of the present invention.Direct-reduced iron production reduction furnace, structure comprises that body of heater, furnace body outer wall are the fireinsulation thermal insulation layer, is provided with heating board in the fireinsulation thermal insulation layer, heating board is connected with electric installation; The body of heater top is provided with opening for feed, and bottom of furnace body is provided with discharge port.
Above-mentioned direct-reduced iron production reduction furnace, described heating board spread configuration are heat tunnel between adjacent heating board in body of heater.
Above-mentioned direct-reduced iron production reduction furnace, described heating board material are silicon carbide, graphite or metal heating board.
Above-mentioned direct-reduced iron production reduction furnace connects flue on the described body of heater.
Above-mentioned direct-reduced iron production reduction furnace, described body of heater are divided into preheating section from top to bottom, section and reduction reaction section heat up.
Existing direct-reduced iron working method can be divided into two large classes: use the gas base directly reducing method of gaseous reducing agent and the coal-based direct reduction method of use solid reductant.No matter be which kind of method, the iron ore raw material grade of reducing is all required too high (TFe 〉=66%).The present invention becomes sponge iron through device of the present invention with solid-state direct-reduction after the lump ore of any grade can being mixed as reductive agent with an amount of charcoal piece, and degree of metalization can reach more than 96%.Needed energy is to be inputted by external electric energy in the production process, in whole technological process, there is not outside air to enter, the gas that carbon is sent in the process of reduced iron only has CO gas, whole flue gas obtains pure CO gas after purifying, can be directly used in generating, for reduction furnace self.Device of the present invention has been broken away from the restriction to iron ore grade and colliery quality and kind, reductive agent both can be coking coal, brown coal, it also can be the carbon dust of enrichment in large trade waste degree of depth resource utilization removal process, draw materials abundant, simple in structure, technology is reliable, environmental-protecting performance is good, significantly reduced production cost, particularly improved the added value in the production process, can be very low initial amount, the ultralow grade valuable metal ore deposit that at all can not be referred to as ore deposit enrichment of ore-forming in slag or in the off-gas recovery thing in the production process of direct-reduced iron forms new resource.Body of heater of the present invention, take electric heating body as heating source, Heating temperature, the power of whole body of heater are adjustable, can control effectively to reduction reaction, can reach the temperature requirement of iron ore reduction, can prevent that again Heating temperature is too high, and material condenses.Structure is simpler, and is easy to operate.
Description of drawings
Accompanying drawing 1 is a kind of structural representation of the present invention;
Accompanying drawing 2 is the side-view of accompanying drawing 1 body of heater;
Accompanying drawing 3 is the vertical view that heating board is arranged in the accompanying drawing 1;
Accompanying drawing 4 is another kind of structural representation of the present invention;
Accompanying drawing 5 is the vertical view that heating board is arranged in the accompanying drawing 4;
Accompanying drawing 6 is the third structural representation of the present invention;
Accompanying drawing 7 is the profile schematic diagram of accompanying drawing 6 bodies of heater.
Embodiment
Embodiments of the invention.Direct-reduced iron production reduction furnace shown in Fig. 1-7, is made body of heater on the pedestal 2, and furnace body outer wall is fireinsulation thermal insulation layer 5, and at fireinsulation thermal insulation layer 5 interior installation heating boards 7, heating board 7 is connected with electric installation 3; The body of heater top connects opening for feed 4, and bottom of furnace body is produced discharge port 1.
In the body of heater, a plurality of heating board 7 spread configurations are heat tunnel between adjacent heating board 7 in body of heater.Heating board 7 can direct insertion parallel connection be placed (as shown in Figure 5), or (as shown in Figure 3) placed in the series connection of S type.Heating board 7 materials can adopt the existing electric heating bodies such as silicon carbide, graphite or metal heating board.
Connect flue 6 at body of heater, link position can be the positions such as top, sidewall or bottom of body of heater.
Body of heater is divided into three sections from top to bottom, is respectively preheating section, intensification section and reduction reaction section.
Working process is as follows:
A, sweetening agent, dephosphorizing agent, reductive agent mixed after, dry again to material moisture less than 3%, the material after the oven dry is pulverized, the crushing material granularity obtains reducing additive below 1.5mm.
B, iron ore is pulverized post-drying, material moisture is less than 3%;
C, will reduce additive and iron ore powder and send in the body of heater from opening for feed 4, material enters the heat tunnel between the heating board 7, by heating board 7 heating, material is preheated to 300 ℃-500 ℃ at preheating section first, enter the section that heats up and be warming up to 950 ℃, be heated to 950 ℃-1100 ℃ in the reduction reaction section again and carry out reduction reaction, the iron oxide reduction in the ore obtains fe, then fall into the cooling section of discharge port 1, come out of the stove after waiting material cooling.
D, the material of coming out of the stove, are selected the iron of reduction by magnetic separation through further carrying out fragmentation after the cooling, by the briquetting press compound stalk forming, obtain direct-reduced iron again.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, any technical solution of the present invention content that do not break away from,, all still belong in the scope of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment does according to technical spirit of the present invention.
Claims (5)
1. direct-reduced iron production reduction furnace, structure comprises body of heater, it is characterized in that: furnace body outer wall is fireinsulation thermal insulation layer (5), is provided with heating board (7) in fireinsulation thermal insulation layer (5), and heating board (7) is connected with electric installation (3); The body of heater top is provided with opening for feed (4), and bottom of furnace body is provided with discharge port (1).
2. direct-reduced iron production reduction furnace according to claim 1, it is characterized in that: described heating board (7) spread configuration is heat tunnel between adjacent heating board (7) in body of heater.
3. direct-reduced iron production reduction furnace according to claim 1, it is characterized in that: described heating board (7) material is silicon carbide, graphite or metal heating board.
4. direct-reduced iron production reduction furnace according to claim 1 is characterized in that: connect flue (6) on the described body of heater.
5. direct-reduced iron production reduction furnace according to claim 1 is characterized in that: described body of heater is divided into preheating section from top to bottom, section and reduction reaction section heat up.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104152521A CN102899438A (en) | 2012-10-26 | 2012-10-26 | Reducing furnace used for producing direct reduction iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104152521A CN102899438A (en) | 2012-10-26 | 2012-10-26 | Reducing furnace used for producing direct reduction iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102899438A true CN102899438A (en) | 2013-01-30 |
Family
ID=47571923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012104152521A Pending CN102899438A (en) | 2012-10-26 | 2012-10-26 | Reducing furnace used for producing direct reduction iron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102899438A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4140301A (en) * | 1977-02-16 | 1979-02-20 | Midrex Corporation | Method and apparatus for reducing particulate iron oxide to metallic iron with solid reductant |
| CN201043182Y (en) * | 2007-06-06 | 2008-04-02 | 王东海 | Electrical heated equipment for direct reduction of sponge iron |
| CN202912999U (en) * | 2012-10-26 | 2013-05-01 | 贵州新天地设备有限公司 | Reduction furnace for producing direct-reduced iron |
-
2012
- 2012-10-26 CN CN2012104152521A patent/CN102899438A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4140301A (en) * | 1977-02-16 | 1979-02-20 | Midrex Corporation | Method and apparatus for reducing particulate iron oxide to metallic iron with solid reductant |
| CN201043182Y (en) * | 2007-06-06 | 2008-04-02 | 王东海 | Electrical heated equipment for direct reduction of sponge iron |
| CN202912999U (en) * | 2012-10-26 | 2013-05-01 | 贵州新天地设备有限公司 | Reduction furnace for producing direct-reduced iron |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110157846B (en) | Method for adding scrap steel into blast furnace in large proportion | |
| CN103468961B (en) | A kind of airtight cupola furnace process Steel Plant are containing zinc, lead powder dirt processing method | |
| CN105969981B (en) | A kind of technique of vanadium titano-magnetite comprehensive utilization | |
| CN102758085B (en) | Method for producing nickel-iron alloy by smelting red earth nickel mineral at low temperature | |
| CN100482808C (en) | Comprehensive utilization technique for low-grade laterite nickel ore | |
| CN104195279B (en) | A kind of red soil nickel ore prepares the technique of ferronickel | |
| CN102492843A (en) | Production method through combined treatment of laterite by direct current electric furnace | |
| CN103451451A (en) | Ferro-nickel alloy production technology with laterite nickel ore processed through oxygen enrichment hot air shaft furnace | |
| CN102634622A (en) | Method for reducing and separating metallic irons by using refractory ores, complex ores and iron-containing wastes | |
| CN101418389A (en) | Method for directly reducing grain nickel iron in rotary kiln by using laterite nickle mine | |
| CN101418388B (en) | Process for producing nickel iron in rotary kiln-blast furnace by using laterite nickle mine | |
| CN110195139A (en) | A kind of iron ore low-temperature reduction-room temperature slag iron separation-electric arc steel making process | |
| CN102851490B (en) | Method for preparing high-quality calcine by fluidized reduction roasting of nickel oxide ore | |
| CN113736940A (en) | Method for treating copper slag by rotary hearth furnace | |
| CN102643942A (en) | Reduction kiln equipment and method for directly reducing iron | |
| Dutta | Iron ore-coal composite pellets/briquettes as new feed material for iron and steelmaking | |
| CN105925806B (en) | It is a kind of to be reduced directly metallurgical method | |
| CN102409126A (en) | Integrated reduction ironmaking furnace and integrated reduction ironmaking process | |
| CN105087913B (en) | The metallurgical method of pellet | |
| CN101875986A (en) | Method for treating iron-containing dusts in steel plant by using melting gasification furnace | |
| CN202912999U (en) | Reduction furnace for producing direct-reduced iron | |
| CN202912998U (en) | Reduction furnace provided with heating liner and used for producing direct-reduced iron | |
| CN202912997U (en) | Intermediate frequency furnace for producing direct-reduced iron | |
| CN202912996U (en) | Reduction furnace for producing direct-reduced iron | |
| CN102312081B (en) | Method of preparing nickel alloy from nickel laterite ores with vehicle rapid reducing furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| ASS | Succession or assignment of patent right |
Owner name: ZOU JIANMING Free format text: FORMER OWNER: GUIZHOU XINTIANDI EQUIPMENT CO., LTD. Effective date: 20131218 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20131218 Address after: 1, unit 3, building 99, 550014 Yucai Road, Baiyun District, Guizhou, Guiyang, 601 Applicant after: Zou Jianming Address before: 550014, Guizhou, Guiyang Baiyun District, aluminum and aluminum processing base, East Ring Road, aluminum City, four floor, aluminum City Applicant before: Guizhou Xintiandi Equipment Co., Ltd. |
|
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20130130 |