CN2288182Y - Steel side bottom blowing blast furnace - Google Patents
Steel side bottom blowing blast furnace Download PDFInfo
- Publication number
- CN2288182Y CN2288182Y CN 96203243 CN96203243U CN2288182Y CN 2288182 Y CN2288182 Y CN 2288182Y CN 96203243 CN96203243 CN 96203243 CN 96203243 U CN96203243 U CN 96203243U CN 2288182 Y CN2288182 Y CN 2288182Y
- Authority
- CN
- China
- Prior art keywords
- furnace
- oxygen
- pipe
- blast
- steel
- 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.)
- Expired - Fee Related
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 18
- 239000010959 steel Substances 0.000 title claims abstract description 18
- 238000007664 blowing Methods 0.000 title description 6
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 38
- 239000001301 oxygen Substances 0.000 claims abstract description 38
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000003245 coal Substances 0.000 claims abstract description 13
- 239000007921 spray Substances 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 239000011449 brick Substances 0.000 claims abstract description 3
- 239000000919 ceramic Substances 0.000 claims abstract description 3
- 239000002283 diesel fuel Substances 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- 229910052742 iron Inorganic materials 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 8
- 210000001015 abdomen Anatomy 0.000 claims description 7
- 239000003818 cinder Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 5
- 239000000292 calcium oxide Substances 0.000 claims description 5
- 239000002817 coal dust Substances 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 239000008234 soft water Substances 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 206010061926 Purulence Diseases 0.000 claims 1
- 239000002131 composite material Substances 0.000 claims 1
- 235000019628 coolness Nutrition 0.000 claims 1
- 238000007598 dipping method Methods 0.000 claims 1
- 239000012716 precipitator Substances 0.000 claims 1
- 239000002023 wood Substances 0.000 claims 1
- 238000009628 steelmaking Methods 0.000 abstract description 8
- 239000002893 slag Substances 0.000 abstract description 6
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 abstract 1
- 230000005484 gravity Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 5
- 239000000571 coke Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 238000005261 decarburization Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000003034 coal gas Substances 0.000 description 2
- 238000005367 electrostatic precipitation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 208000011580 syndromic disease Diseases 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000001888 Peptone Substances 0.000 description 1
- 108010080698 Peptones Proteins 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 235000019319 peptone Nutrition 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Images
Landscapes
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Manufacture Of Iron (AREA)
Abstract
The utility model relates to a metallurgical steel blast furnace, which is in a short and fat shape and is provided with a high-pressure bell-less furnace top, a ceramic body furnace hearth, a carbon-silicon brick furnace wall and a T-shaped cooling wall which are connected by expansion pipes, an air supply device connected with a corrugated pipe is arranged below a hot air surrounding pipe, an oxygen coal spray gun is inserted, a tuyere is declined for 18 degrees and uniformly distributed with the furnace hearth, an oxygen delivery pipe is connected with a trickle oxygen lance with 27 degrees of upward inclination at the furnace bottom, the rotating porous spray head of the oxygen lance is cooled by diesel oil, a thermocouple is arranged, a steel port and a slag port are kept at 120 degrees, three struts are uniformly distributed outside the furnace, and the upward pipe of the blast furnace is connected with a gravity. The high-pressure blower is communicated with the hot blast stove and the blast furnace surrounding pipe. The steel-making device is characterized in that steel-making is completed at one time, energy is saved, the yield is high, and the device is easy to change into iron-making equipment.
Description
The utility model relates to a kind of steel-making iron-smelting blast furnace of metallurgical single stage method.
Its whole production flow process is iron and steel side bottom blowing blast furnace one gravitational precipitator---bag-type dust removal system---electrostatic precipitation, and hot blast stove system is formed.
Tradition metallurgical technology weak point blast furnace ironmaking is again with converter decarburization steel-making, and human and material resources, energy dissipation are very big like this, and production efficiency is low.
The purpose of this utility model is saved chemical energy carbon monoxide and oxidation heat energy in the converter steelmaking at shortened process, and reduces investment and steel product cost, boosts productivity.
The purpose of this utility model can realize by following measure:
Windlass travels truck 1 on skew bridge 2, be connected with no bell high pressure furnace roof 5 on the skew bridge 2, no bell high pressure furnace roof 5 is connected with burner, burner is connected with throat armour 15 down, pyknic type body aspect ratio HU/D is about 2.749, blast-furnace body cupola well 30 is built into by the ceramic brickwork matrix material, and bosh, furnace bosh, shaft all adopt carbide brick SI
3-N-SIC is built into furnace wall, with soft water closed cycle cooling system 8 protection furnace walls 16, adopts tee T biexhaust pipe structure cooling stave, and cooling stave connects with corrugated tube 13, all dilatation joint spraying CN-13 coating.
State of Blast Furnace is within the walls by box hat 7 sealings, furnace bosh is equipped with bustle pipe 10 outward, have under the chess cover air-supply dress system and oxygen coal spray gun dress system as: blow elbow 11, the swollen peptone device 13 of corrugated tube, belly pipe 14, the big small water sleeve 27 in air port and 28, and dip down and be communicated with cupola well 30 about 18 °, on belly pipe 14, be inserted with oxygen coal spray gun 12 respectively.
Oxygen cathete is housed on bustle pipe 10 contains calcium oxide powder 9, and be connected respectively, and thread oxygen rifle 22 is the insertions that are inclined upwardly at the bottom of cupola well 30 sides, and stagger with the air port with 10 thread oxygen rifles 22.And thread oxygen rifle 22 adopts the rotation porous nozzle, and cools off with circulation diesel oil.
Tap hole 31 in cupola well 30 bottoms between two air ports, and keep 120 ° with cinder notch 21, and cinder notch 21 exceeds about 0.5 meter of furnace bottom, and 12 in air port exceeds the cupola well bottom surface more than 0.9 meter, and uniform 30 1 weeks of cupola well, a week outside 3 blast furnace pillars, the 20 uniform stoves of furnace bosh bottom.
Blast furnace is managed 4 two towards the sky, put the valve 3 that looses on it, and the pebble stove system is connected with downtake and gravitational precipitator---sack cleaner system---in valve 3 belows.
High pressure blower is connected with bustle pipe by pebble stove.
The drawing of accompanying drawing is described as follows:
Fig. 1 is a structural representation of the present utility model,
Among the figure, molten steel 26-slag small water sleeve 28-air port, liquid 27-air port large water jacket 29-thermocouple 30-cupola well 31-steel mouth 32-oxygen coal gun system when 1-master winch, 2-skew bridge, 3-bleeding valve 4-towards sky pipe 5-without bell high pressure furnace roof 6---furnace roof workbench 7-blast furnace box hat 8-demineralized water circulating cooling system 9-oxygen cathete contains calcium oxide powder 10-bustle pipe 11-send hot blast elbow 12-oxygen coal spray gun 13-bellow expander 14-belly pipe 15-throat armour 16-furnace wall 17-high furnace chamber lump zone 18-cohesive zone 19-slag iron and falls to being with 20-blast furnace pillar, 21-cinder notch, 22-thread oxygen rifle, 23-furnace bottom, 24-furnace foundation 25-smelting
Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail:
Pass through skew bridge 2 with skip hoist 1, no bell high pressure furnace roof 5 is sent in ripe ore deposit and coke, entering the high furnace chamber lump zone 17 of novel iron and steel by furnace throat 15 moves from top to bottom, and high pressure blower exchanges to such an extent that hot blast is delivered to bustle pipe 10 by hot blast stove system, through 12 uniform hot blast elbows 11, bellow expander 13,270 two of belly pipe 14 and air port small water sleeves, downward-sloping about 18 °, blow wind-warm syndrome more than 1000 to cupola well 30, after the metal liquid and slag in the hot blast elder generation twist cupola well 30, move upward by cohesive zone and burnt window from bottom to top again, produce the reducing gas carbon monoxide at cupola well 30 internal combustion coke and series of chemical takes place with motion and ripe ore deposit, to form reflowing band 18, and splash into cupola well 30 by burnt window, form molten iron and slag liquid, 27 ° of directions simultaneously are inclined upwardly at the bottom of cupola well 30 sides, insert 10 Raoul reworkeds rotation thread oxygen lance blow heads 22 and stagger with the air port, and the oxygen rifle is not established in steel mouth 31 both sides, each oxygen rifle blows 0,315kg/ minute oxygen, and carry calcium oxide powder about diameter 1mm, be inclined upwardly at the bottom of cupola well 30 sides and be blown into molten iron, make the calcium oxide powder desulfurization, dephosphorization and decarburization: [C]+[O]=[CO] speed of response improves greatly, thereby guarantees the steel-making quality.Guarantee that the oxidation heat energy that [CO] produces when being fully utilized with the side BOTTOM OXYGEN to cupola well 30 tops is fully utilized, and reaches the purpose of falling the bed coke ratio.Also combine simultaneously the common advantage of bottom blowing and side-blown converter, and shift to an earlier date dephosphorization during the steel-making of side bottom blowing spray lime powder and decarburization is carried out simultaneously.And lump zone in the furnace chamber, heat exchange constantly takes place with hot ore deposit of furnace charge and coke in the coal gas of high temperature stream that is moved upward by cupola well, when making coal gas stream reach no bell high pressure furnace roof 5, gas temperature drops to about 300 °, at last by flowing to gravitational dust collection and bag-type dust and electrostatic precipitation towards sky pipe 4 and downtake, become purified gas and enter hot-blast stove gas burner with hotblast stove ball bed burning heat, the big lip cap dome temperature burns about 1350 °; And high pressure blower will carry out heat exchange by hotblast stove ball bed and vault to obtain hot blast and deliver to bustle pipe 10, be blown into cupola well by each inclination air port respectively again, and whole production forms a closed technical process.Adopt thermocouple temperature measuring apparatus 29 to judge the husky position of cupola well 30 spray repair magnesium.Adopt 12 oxygen coal spray guns 12, insert the air port from belly pipe, be connected with belly pipe, the inlet front end oxygen concentration is reached about 28-31%, injecting coal quantity reaches 170Kg/TFe and can make the high like this oxygen enrichment of iron and steel volume increase 21-27% before the air port, the coal dust accumulation that can weaken cohesive zone 18 and lump zone zone 17 helps permeability of stock column changing, and improves the strong and high-coal ratio winding-up of smelting.Went out molten steel 18.06T/160 minute from steel mouth 31, must not reduce pressure,, and, prepare corresponding oxidation calcium powder amount and blast 3.0Kg/cm with 3.35Kg/ minute of oxygen blast speed with anti-clogging plug oxygen rifle or damage air port and cinder notch
2About, 1000 ° of left and right sides wind-warm syndrome and stable raw material composition are controlled the molten steel composition.Simultaneously,, avoid the cupola well rapid heat cycle, wait with oxygen-blowing gun 22 and oxygen coal spray gun 12 and control the utility model working of a furnace and molten steel composition with inclined to one side silicon difference methodology control temperature of the furnace hearth.
Oxygen enrichment pressure and coal powder injection pressure all will be brought up to | 3.0+X | and Kg/cm
2Could guarantee that like this furnace top pressure is at 2.5-3.0Kg/cm
2And thread oxygen rifle 22 pressure should be at | 3.0+ slag iron pressure | Kg/cm
2More than.
When damping down is sat material, must pull out oxygen coal spray gun, in case be blocked.
At last, the utility model tap hole 31 direct and compact type continuous casting and continuous rolling mill technologies.The direct production that is connected becomes structural section.
The utility model is compared with existing 2 steelmaking processes and is had the following advantages:
To smelt iron, make steel disposable finishing, and save the heat energy chemical energy, output is with high investment few, and cost significantly Descend, be easy to utilize the ironmaking equipment overhauling reform to become the utility model.
Claims (1)
1, the utility model iron and steel blast furnace does not have the bell furnace roof by high pressure.Blast-furnace body, bustle pipe, oxygen coal spray gun device, thread rotation oxygen rifle.Supply air system and worktable, tap hole, cinder notch, thermopair cool off system and it is characterized in that:
A, truck elevator 1 travels on skew bridge 2, skew bridge 2 is connected with no bell high pressure furnace roof 5, the high pressure furnace roof is connected with typical pyknic type blast-furnace body burner, the blast-furnace body aspect ratio is about 2.74, stack angle is about 78.69 °, bosh angle is about 73.14 °, blast-furnace body cupola well 30 is built into by ceramic brickwork composite wood section, the furnace wall other parts are built into furnace wall as carbide brick, the tee T biexhaust pipe novel texture cooling stave that has soft water closed cycle cooling system 8 protection furnace walls 16 to adopt, cooling stave passes in and out effective bellows expander 13 and connects, and the water pipe between the cooling stave connects with bellow expander 13, all dilatation joint spraying CN-13 coating;
7 sealings of blast furnace box hat are arranged outside b, the furnace wall, bustle pipe 10 is housed outside blast furnace bosh, 12 air-supply arrangements are equipped with in the bustle pipe bottom: as air-supply elbow 11, the swollen purulence device 13 of corrugated tube, belly pipe 14, air port size cover 28, air port small water sleeve 27, and do on oblique about the 18 ° line from elbow lower end spy hole to the air port dipping down;
C, be inserted with oxygen coal spray gun 12 on belly pipe, divide internal and external casing, walk coal dust in the spray gun, walk oxygen outward, the rifle head is an eddy flow rifle head;
D, at bustle pipe 10 oxygen cathete is housed and contains calcium oxide powder 9. and be connected respectively with 10 thread oxygen rifles 22, thread rifle 22 is from the then end 27 ° of insertions that are inclined upwardly of cupola well 30, and stagger with the air port, and steel mouth both sides there are not the oxygen rifle, and oxygen rifle head adopts Raoul reworked oxygen lance blow head, it is the rotation porous nozzle, tilts 25 ° to the 22 employing circulation diesel oil coolings of 16 ° of left and right sides oxygen rifles of centrifugal direction inclination to garden Zhou Fangxiang;
C. tap hole 31 is positioned at cupola well 30 bottoms, keep 120 ° of cinder notch 21 to exceed 0.541 meter of furnace bottom with cinder notch 21 on horizontal plane, 12 in air port exceeds 0.941 meter of cupola well bottom surface, and 30 1 weeks of uniform cupola well, and downward-sloping about 18 °, a week outside 3 pillars in furnace bosh bottom 20 are uniform;
F, blast furnace are equipped with on the sky pipe 4 and diffuse 3 two on valve, also have worktable 6, and---sack cleaner---electrostatic precipitation---big lip cap pebble stove system is connected towards sky pipe 4 usefulness downtakes and gravitational precipitator;
G, employing high pressure blower 3.0Kg/cm
2About, blower fan is connected with bustle pipe 10 by pebble stove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96203243 CN2288182Y (en) | 1996-01-19 | 1996-01-19 | Steel side bottom blowing blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96203243 CN2288182Y (en) | 1996-01-19 | 1996-01-19 | Steel side bottom blowing blast furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2288182Y true CN2288182Y (en) | 1998-08-19 |
Family
ID=33888905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96203243 Expired - Fee Related CN2288182Y (en) | 1996-01-19 | 1996-01-19 | Steel side bottom blowing blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2288182Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101942539A (en) * | 2010-08-26 | 2011-01-12 | 周建安 | Method for smelting molten iron to form rerolled steel by oxygen blowing blast furnace |
| CN101962697A (en) * | 2010-11-01 | 2011-02-02 | 中冶京诚工程技术有限公司 | Oxygen coal spray gun nozzle combining device |
| CN104152618A (en) * | 2014-08-07 | 2014-11-19 | 山西太钢不锈钢股份有限公司 | Soft-water cooling pipeline control method for blast furnace |
-
1996
- 1996-01-19 CN CN 96203243 patent/CN2288182Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101942539A (en) * | 2010-08-26 | 2011-01-12 | 周建安 | Method for smelting molten iron to form rerolled steel by oxygen blowing blast furnace |
| CN101962697A (en) * | 2010-11-01 | 2011-02-02 | 中冶京诚工程技术有限公司 | Oxygen coal spray gun nozzle combining device |
| CN101962697B (en) * | 2010-11-01 | 2012-02-08 | 中冶京诚工程技术有限公司 | Oxygen coal spray gun nozzle combining device |
| CN104152618A (en) * | 2014-08-07 | 2014-11-19 | 山西太钢不锈钢股份有限公司 | Soft-water cooling pipeline control method for blast furnace |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102337369B (en) | High-wind-temperature rotational flow injection disturbance melting reduction and prereduction combination device and method | |
| CN101445848B (en) | Process and device for continuous steelmaking from ferriferous material | |
| CN1144275A (en) | Apparatus for producing molten pig iron by direct reduction | |
| CN101008554A (en) | Shaft furnace for production of ferrochromium and smelting method thereof | |
| CN107419051B (en) | Promote the smelting process of converter scrap melting using gasification dephosphorized slag | |
| CN105624358B (en) | A kind of method of single-turn stove dioxygen rifle production Low-phosphorus Steel | |
| CN104328242A (en) | Steelmaking method of high-phosphorus molten iron containing vanadium-titanium | |
| CN102816885A (en) | Iron-making, steel-making and direct fusing reduction integrated blast furnace technology | |
| CN101875985A (en) | Energy-saving emission-reducing intensive blast furnace technology | |
| CN114350869B (en) | Oxygen blast furnace type structure with furnace body blowing reducing gas | |
| CN106086281A (en) | The ironmaking of a kind of flash and the integrated apparatus of coal gas and method | |
| JPS62263906A (en) | Method for blowing pulverized coal from blast furnace tuyere | |
| CN106643198A (en) | Subsonic/supersonic jet spraying gun for molten pool smelting side blowing | |
| CN2288182Y (en) | Steel side bottom blowing blast furnace | |
| KR19990008225A (en) | Smelting method of metal raw material in blast furnace | |
| CN102127610B (en) | Ironmaking equipment and process for direct smelting reduction of iron ore | |
| CN109536663B (en) | Rotary kiln gas-based reduction-total oxygen molten pool smelting iron-making method | |
| US3364009A (en) | Method for the production of iron and steel | |
| CN216473293U (en) | Atomized water cooling device used in closed blast furnace front iron notch | |
| Zhou et al. | Development of Smelting Reduction Ironmaking Process | |
| CN2711660Y (en) | Hot air cupola | |
| CN109439915B (en) | Method for online treatment of zinc-containing dust by utilizing sensible heat of blast furnace high-temperature slag and application of method | |
| CN1184333C (en) | Multiple molten pool oxygen steel-making furnace for iron core reducing melting and its technological process | |
| US3235242A (en) | Rotary furnace | |
| US3188065A (en) | Smelting-furnace, particularly for the production of steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |