CN103969424B - Testing device and testing method for zinc corrosion resistance of refractory lining bricks - Google Patents
Testing device and testing method for zinc corrosion resistance of refractory lining bricks Download PDFInfo
- Publication number
- CN103969424B CN103969424B CN201410211145.6A CN201410211145A CN103969424B CN 103969424 B CN103969424 B CN 103969424B CN 201410211145 A CN201410211145 A CN 201410211145A CN 103969424 B CN103969424 B CN 103969424B
- Authority
- CN
- China
- Prior art keywords
- test
- zinc
- lining brick
- graphite crucible
- layer
- 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
Landscapes
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention relates to a testing device for zinc corrosion resistance of refractory lining bricks. The testing device consists of a heating furnace, a fire-proof heat insulating layer arranged on the inner wall of the heating furnace, a hearth, a graphite crucible, a thermocouple and a temperature controller. The height or length of the hearth is divided into a constant temperature area, a variable temperature area I and a variable temperature area II; the graphite crucible is arranged at the constant temperature area, and carbon granules are arranged at the variable temperature area I and the variable temperature area II; the heating furnace and the graphite crucible are respectively provided with a door or a cover. A testing method comprises the steps of drying the tested lining bricks; cooling the tested lining bricks to the room temperature by air-cooling; putting the graphite crucible at the constant temperature area, and alternately laying zinc powder and the tested lining bricks according to the sequence of zinc powder, tested lining brick and zinc powder; filling the variable temperature area I and the variable temperature area II by the carbon granules; testing by starting the testing device; stopping the heating furnace, and cooling the tested lining bricks to the room temperature by air-cooling along with the heating furnace; carrying out a room temperature withstand voltage strength test on the sample. After the testing device and the testing method are adopted, the zinc corrosion resistance of the refractory lining bricks in the furnace can be improved, so that the operation of zinc to a blast furnace and the damage of zinc to a furnace body can be reduced, and basis and guarantee work are provided for preventing the furnace body of the blast furnace from being damaged and prolonging the service life of the blast furnace.
Description
Technical field
The present invention relates to a kind of test unit and test method thereof of refractory lining brick performance, belong to test unit and the test method of the anti-zinc erosion of a kind of refractory lining brick particularly.Be particularly useful for high-alumina brick, microporous carbon brick, the anti-zinc aggressivity mensuration of the contour furnace lining material of microporous carbon-aluminium brick.
Background technology
Blast furnace raw material zinc content has the trend of increase, adds that high zinc content secondary recovery resource is returned Iron Ore Matching in Sintering and used, causes blast furnace Zn load higher, produce larger harm to blast furnace, affects blast furnace operating and blast furnace serviceable life.
The harm that zinc brings operation of blast furnace production, mainly contains the following aspects
1) make furnace charge decline to have some setbacks, even cause hanging;
2) zinc is at furnace lining surface deposition, easily produces accretion;
3) zinc is in furnace lining inside deposition, causes furnace lining significantly to expand, destroys;
4) zinc is at stove Inner eycle, causes certain transfer of heat;
5) blowing devices such as air port are burnt out;
6) air port two is caused to overlap distortion;
7) coal gas dust removal pipeline easily blocks;
8) gas stop valve is easily stuck.
The richness of zinc amasss principle:
Decline with furnace charge and heat up gradually, in raw material, zinc starts reduction, and the reduction temperature of Zn is 1030 DEG C, vapourizing temperature is 908 DEG C, and when temperature is elevated to more than 1030 DEG C, namely ZnO is reduced to zinc, because the vapourizing temperature of zinc is lower than the reduction temperature of ZnO, the zinc be reduced is vaporized immediately, rises, decline to upper blast furnace gas temperature with coal gas, zinc is oxidized generation ZnO again, being attached on the lower furnace charge of temperature of having declines with furnace charge, is reduced vaporization again to high-temperature region, and the circulation richness forming zinc is long-pending.There is part ZnO to be attached on stove dirt or powdering discharges out of the furnace with coal gas, so that gas ash, stokehold dirt, all contain very high ZnO in washing mud.
The zinc fume restored in cupola well high-temperature region some can infiltrate in the brickwork joint of bricking, pore and crackle, meet cold meeting and be frozen into liquid or solid (temperature of solidification 419.47 DEG C), when causing tearing stove open, in brickwork joint, have spelter, when changing air port, flow out zinc liquid.
The measure of control zinc harm:
1) should note reducing into stove zinc amount
Sintering deposit mainly washs mud, stokehold dirt and gas ash containing the reason that zinc is high and enters sintering as mineral use, and the zinc that blast furnace is discharged reenters blast furnace, and the circulation richness formed outside stove is long-pending.That should formulate ore contains zinc standard, and the zinc content of washing mud, stokehold dirt and gas ash is above standard and should not adopts, in order to avoid improve into stove Zn load back into stove.
2) prevent zinc from depositing in a large number in stove
There is the scoriform thing that a large amount of ZnO and deposit carbon are mixed to form in blast furnace, is ZnO rich long-pending principal mode in cupola well.Blast furnace operating can be taken measures, and avoids ZnO to deposit in a large number in stove, have following some:
A) keep blast furnace design to stablize, corrode evenly, flat smooth, do not occur the too fast erosion in local, form eroded crater, for ZnO deposition creates conditions.
B) higher temperature of the furnace hearth is kept, or higher molten iron temperature:
3) improving the anti-zinc erosional competency of blast furnace bricking is one of major measure reducing zinc harm, mainly improves the coefficient of heat conductivity of fire resistive material, strengthens the average pore size cooling and reduce fire resistive material, stop zinc fume to enter bricking inside.
For Wuhan Iron and Steel Plant, blast furnace Zn load measurement result shows, Zn load is generally at about 0.5Kg/t, and have individually and reach more than 1.5Kg/t, Zn load is higher.Blast furnace zinc main source is from sintering deposit and pellet, and it accounts for more than 80% of zinc source, and comprehensive powder and the recovery secondary resource containing zinc higher are also the reasons causing sintering deposit Zn content high.
Reduce zinc to the harm of blast furnace bricking, except setting about from the furnace entering volume reducing zinc, also should set about the anti-zinc erosional competency studying refractory lining brick in stove.
Through retrieval, for reducing zinc to the harm of blast furnace bricking, document mainly reduces the furnace entering volume of zinc from research and removes zinc method raw material and set about, and the research for the erosional competency of blast furnace bricking opposing zinc has no bibliographical information.
Summary of the invention
The present invention is directed to current blast furnace Zn load large, and affect blast furnace normal production and serviceable life problem, a kind of anti-zinc erosion performance research experiment to refractory lining brick being provided, reducing for improving the anti-zinc erosional competency of refractory lining in stove zinc to provide foundation test unit and test method thereof to the operation of blast furnace and the harm of body of heater.
Realize the measure of above-mentioned purpose:
The test unit that the anti-zinc of refractory lining brick corrodes, the burner hearth formed by the fireproof heat-insulating layer of heating furnace, heating furnace inwall, fireproof heat-insulating layer, be loaded on graphite crucible in burner hearth and thermopair, the temperature controller that is connected with thermopair forms, it is: 1/3 ~ 2/3 place of furnace height or length is set to flat-temperature zone, less than 1/3 is Wen Bianqu mono-, and more than 2/3 is Wen Bianqu bis-; Graphite crucible is contained in flat-temperature zone, fills the carbon granules of granularity≤8mm at Wen Bianqu mono-and Wen Bianqu bis-; Described heating furnace and graphite crucible are band door or lid.
The method tested is carried out, its step with the test unit that the anti-zinc of refractory lining brick corrodes:
1) first dry at temperature is 105 ~ 115 DEG C test lining brick, drying time is not less than 90 minutes;
2) by dry test lining brick through air cooling to room temperature;
3) graphite crucible is placed in flat-temperature zone; The zinc powder layer that a layer thickness is 1/3 ~ 1/2 of test lining brick thickness is first spread in graphite crucible; On zinc powder layer, plane is placed test lining brick and is formed test lining brick layer, and between test lining brick and test lining brick, the control interval is no less than 15mm; Test lining brick layer re-lays zinc powder layer, until all covered by test lining brick layer; Graphite crucible is closed;
4) carbon granules of granularity≤8mm is filled until fill at Wen Bianqu mono-and Wen Bianqu bis-;
5) start the test unit that the anti-zinc liquid of refractory lining brick corrodes, under heating rate is 8 ~ 12 DEG C/min, makes fire box temperature rise to 980 ~ 1020 DEG C; And be incubated, temperature retention time is not less than 18 hours;
6) power failure makes heating furnace out of service, makes test lining brick with heating furnace air cooling to room temperature;
7) taken out by test lining brick and carry out cold crushing strength test before and after specimen test, the anti-zinc ability of bricking represents to test front and back intensity rate of descent, and the less anti-zinc ability of intensity rate of descent is stronger.
It is characterized in that: the zinc powder layer in graphite crucible and test lining brick layer are that interval is arranged.
It is characterized in that: test lining brick layer is that the refractory lining brick of same material or unlike material carries out laying test simultaneously.
The present invention is especially to the anti-zinc erosion performance research experiment of refractory lining brick, reduce the operation of zinc to blast furnace and the harm of body of heater for improving the anti-zinc erosional competency of refractory lining in stove, for prevent thus to the infringement of blast furnace and provide serviceable life according to and safeguard work.
Accompanying drawing explanation
Accompanying drawing is the structural representation of the test unit that the anti-zinc liquid of refractory lining brick of the present invention corrodes;
In figure: 1-heating furnace, 2-heat insulation layer, 3-burner hearth, 4-graphite crucible, 5-thermopair,
6-temperature controller, 7-flat-temperature zone, 8-Wen Bianqu mono-, 9-Wen Bianqu bis-, 10-carbon granule.
Embodiment
Below in conjunction with accompanying drawing, the structure of apparatus of the present invention and test method are described in detail:
The test unit that the anti-zinc of refractory lining brick corrodes, the burner hearth 3 formed by heating furnace 1, the fireproof heat-insulating layer 2 of heating furnace 1 inwall, fireproof heat-insulating layer 2, be loaded on graphite crucible 4 in burner hearth 3 and thermopair 5, the temperature controller 6 that is connected with thermopair 5 forms.1/3 ~ 2/3 place of burner hearth 3 height or length is set to flat-temperature zone 7 by it, and less than 1/3 is Wen Bianqu 1, and more than 2/3 is Wen Bianqu 29; Graphite crucible 4 is contained in flat-temperature zone 7, fills the carbon granules 10 of granularity≤8mm at Wen Bianqu 1 and Wen Bianqu 29; Described heating furnace 1 and graphite crucible 4 are band door or lid.Heating furnace 1 is vertical or horizontal.
The test method of following embodiment all adopts the test unit of the anti-zinc erosion of above-mentioned refractory lining brick; Parameter that each embodiment is got not is corresponding relation, is only and exemplifies.Zinc powder layer in following embodiment in graphite crucible 4 is that compartment is placed with test lining brick.
Embodiment 1
Test refractory lining brick is each 2 pieces of high-alumina brick and microporous carbon brick.
The step tested is carried out with the test unit that the anti-zinc of refractory lining brick corrodes:
1) first dry at temperature is 105 ~ 110 DEG C test lining brick, drying time is 95 minutes;
2) by dry test lining brick through air cooling to room temperature;
3) graphite crucible 4 is placed in flat-temperature zone 7; The zinc powder layer that a layer thickness is 1/3 of test lining brick thickness is first spread in graphite crucible 4; On zinc powder layer, plane places test high-alumina brick and each 1 piece of formation ground floor test lining brick layer of microporous carbon brick, is spaced apart 18mm between test lining brick and test lining brick; Ground floor test lining brick layer re-lays one deck zinc powder layer until ground floor is tested lining brick layer and all cover, on zinc powder layer, plane places 2 pieces of remaining in addition test bricks again, form second layer test lining brick layer, then on second layer test lining brick layer, lay zinc powder layer until the second layer is tested lining brick layer and all cover and make all to fill up in graphite crucible 4; Graphite crucible 4 cuts out;
4) carbon granules of granularity≤8mm is filled until fill at Wen Bianqu 1 and Wen Bianqu 29; And close heating furnace; If heating furnace 1 is vertical, then first fill carbon granules at Wen Bianqu 1, then graphite crucible 4 to be positioned over and on its carbon granules, then fill the carbon granules of granularity≤8mm until fill at the Wen Bianqu 29 of graphite crucible more than 4;
5) start the test unit that the anti-zinc of refractory lining brick corrodes, under heating rate is 9 DEG C/min, makes fire box temperature rise to 990 DEG C; And be incubated 18.5 hours;
6) power failure makes heating furnace out of service, makes test lining brick with heating furnace air cooling to room temperature;
7) test lining brick taken out and carry out cold crushing strength test before and after specimen test.
Through test under equal conditions, before high-alumina brick test, compressive resistance is 87.5MPa, after test, compressive resistance is 56.8MPa intensity rate of descent is-35.1%, before microporous carbon brick test, compressive resistance is 38.9MPa, after test, compressive resistance is 36.7MPa intensity rate of descent is-5.7%, compare according to compressive resistance rate of descent, the anti-zinc erosional competency of microporous carbon brick is better than high-alumina brick.
Embodiment 2
Test refractory lining brick is each 2 pieces of alumina carbon brick and schungite brick fuel.
The step tested is carried out with the test unit that the anti-zinc of refractory lining brick corrodes:
1) first dry at temperature is 105 ~ 115 DEG C test lining brick, drying time is 100 minutes;
2) by dry test lining brick through air cooling to room temperature;
3) graphite crucible 4 is placed in flat-temperature zone 7; The zinc powder layer that a layer thickness is 1/2 of test lining brick thickness is first spread in graphite crucible 4; On zinc powder layer, plane places test alumina carbon brick and each 1 piece of formation ground floor test lining brick layer of schungite brick fuel, is spaced apart 16mm between test lining brick and test lining brick; Ground floor test lining brick layer re-lays one deck zinc powder layer until ground floor is tested lining brick layer and all cover, on zinc powder layer, plane places 2 pieces of remaining in addition test bricks again, form second layer test lining brick layer, then on second layer test lining brick layer, lay one deck zinc powder layer until the second layer is tested lining brick layer and all cover and make all to fill up in graphite crucible 4; Graphite crucible 4 cuts out;
4) carbon granules of granularity≤8mm is filled until fill at Wen Bianqu 1 and Wen Bianqu 29; And close heating furnace; If heating furnace 1 is vertical, then first fill carbon granules at Wen Bianqu 1, then graphite crucible 4 to be positioned over and on its carbon granules, then fill the carbon granules of granularity≤8mm until fill at the Wen Bianqu 29 of graphite crucible more than 4;
5) start the test unit that the anti-zinc liquid of refractory lining brick corrodes, under heating rate is 10 DEG C/min, makes fire box temperature rise to 1000 DEG C; And be incubated 20 hours;
6) power failure makes heating furnace out of service, makes test lining brick with heating furnace air cooling to room temperature;
7) test lining brick taken out and carry out cold crushing strength test before and after specimen test.
Through test under equal conditions, before alumina carbon brick test, compressive resistance is 60.6MPa, after test, compressive resistance is 54.8MPa intensity rate of descent is-9.6%, before the test of schungite brick fuel, compressive resistance is 40.1MPa, after test, compressive resistance is 35.9MPa intensity rate of descent is-10.5%, compare according to compressive resistance rate of descent, alumina carbon brick anti-zinc erosional competency is close with schungite brick fuel.
Embodiment 3
Test refractory lining brick is each 2 pieces of clay brick and microporous corundum brick.
The step tested is carried out with the test unit that the anti-zinc of refractory lining brick corrodes:
1) first dry at temperature is 105 ~ 110 DEG C test lining brick, drying time is 105 minutes;
2) by dry test lining brick through air cooling to room temperature;
3) graphite crucible 4 is placed in flat-temperature zone 7; The zinc powder layer that a layer thickness is 1/3 of test lining brick thickness is first spread in graphite crucible 4; On zinc powder layer, plane places test clay brick and each 1 piece of formation ground floor test lining brick layer of microporous corundum brick, is spaced apart 18mm between test lining brick and test lining brick; Ground floor test lining brick layer re-lays one deck zinc powder layer until ground floor is tested lining brick layer and all cover, on zinc powder layer, plane places 2 pieces of remaining in addition test bricks again, form second layer test lining brick layer, then on second layer test lining brick layer, lay zinc powder layer until the second layer is tested lining brick layer and all cover and make all to fill up in graphite crucible 4; Graphite crucible 4 cuts out;
4) carbon granules of granularity≤8mm is filled until fill at Wen Bianqu 1 and Wen Bianqu 29; And close heating furnace; If heating furnace 1 is vertical, then first fill carbon granules at Wen Bianqu 1, then graphite crucible 4 to be positioned over and on its carbon granules, then fill the carbon granules of granularity≤8mm until fill at the Wen Bianqu 29 of graphite crucible more than 4;
5) start the test unit that the anti-zinc liquid of refractory lining brick corrodes, under heating rate is 11 DEG C/min, makes fire box temperature rise to 1020 DEG C; And be incubated 22 hours;
6) power failure makes heating furnace out of service, makes test lining brick with heating furnace air cooling to room temperature;
7) test lining brick taken out and carry out cold crushing strength test before and after specimen test.
Through test under equal conditions, before clay brick test, compressive resistance is 45.3MPa, after test, compressive resistance is 21.9MPa intensity rate of descent is-51.7%, before microporous corundum brick test, compressive resistance is 152.7MPa, after test, compressive resistance is 148.8MPa intensity rate of descent is-2.6%, compare according to compressive resistance rate of descent, clay brick anti-zinc erosional competency is poor, and the anti-zinc erosional competency of microporous corundum brick is good.
Above-described embodiment is only the best and exemplifies, and is not the restriction to embodiments of the present invention.
Claims (2)
1. utilize the test unit of the anti-zinc erosion of refractory lining brick to carry out the method tested, its step:
The test unit that the anti-zinc of refractory lining brick corrodes, the burner hearth formed by the fireproof heat-insulating layer of heating furnace, heating furnace inwall, fireproof heat-insulating layer, be loaded on graphite crucible in burner hearth and thermopair, the temperature controller that is connected with thermopair forms, heating furnace and graphite crucible are band door or lid; And 1/3 ~ 2/3 place of furnace height or length is set to flat-temperature zone, less than 1/3 is Wen Bianqu mono-, and more than 2/3 is Wen Bianqu bis-; Graphite crucible is contained in flat-temperature zone, fills the carbon granules of granularity≤8mm at Wen Bianqu mono-and Wen Bianqu bis-;
1) first dried at temperature is 105 ~ 115 DEG C by test lining brick, drying time is not less than 90 minutes;
2) by dry test lining brick through air cooling to room temperature;
3) graphite crucible is placed in flat-temperature zone; The zinc powder layer one that a layer thickness is 1/3 ~ 1/2 of test lining brick thickness is first spread in graphite crucible; On zinc powder layer one, plane is placed test lining brick and is formed test lining brick layer, and between test lining brick and test lining brick, the control interval is no less than 15mm; Test lining brick layer re-lays zinc powder layer, until all covered by test lining brick layer; Graphite crucible is closed;
4) carbon granules of granularity≤8mm is filled until fill at Wen Bianqu mono-and Wen Bianqu bis-;
5) start the test unit that the anti-zinc of refractory lining brick corrodes, under heating rate is 8 ~ 12 DEG C/min, makes fire box temperature rise to 980 ~ 1020 DEG C; And be incubated, temperature retention time is not less than 18 hours;
6) power failure makes heating furnace out of service, makes test lining brick with heating furnace air cooling to room temperature;
7) taken out by test lining brick and carry out cold crushing strength test before and after specimen test, the anti-zinc ability of bricking represents to test front and back intensity rate of descent, and the less anti-zinc ability of intensity rate of descent is stronger.
2. utilize the test unit of the anti-zinc erosion of refractory lining brick to carry out the method tested as claimed in claim 1, it is characterized in that: test lining brick layer is that the refractory lining brick of same material or unlike material carries out laying test simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410211145.6A CN103969424B (en) | 2014-05-20 | 2014-05-20 | Testing device and testing method for zinc corrosion resistance of refractory lining bricks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410211145.6A CN103969424B (en) | 2014-05-20 | 2014-05-20 | Testing device and testing method for zinc corrosion resistance of refractory lining bricks |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103969424A CN103969424A (en) | 2014-08-06 |
| CN103969424B true CN103969424B (en) | 2015-07-22 |
Family
ID=51239174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410211145.6A Expired - Fee Related CN103969424B (en) | 2014-05-20 | 2014-05-20 | Testing device and testing method for zinc corrosion resistance of refractory lining bricks |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103969424B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108558202B (en) * | 2018-07-27 | 2020-04-17 | 望江县天长光学仪器有限公司 | Optical glass with high refractive index |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102538734A (en) * | 2011-12-25 | 2012-07-04 | 泰山玻璃纤维有限公司 | Erosion detection system for pool wall bricks of glass kiln |
-
2014
- 2014-05-20 CN CN201410211145.6A patent/CN103969424B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102538734A (en) * | 2011-12-25 | 2012-07-04 | 泰山玻璃纤维有限公司 | Erosion detection system for pool wall bricks of glass kiln |
Non-Patent Citations (2)
| Title |
|---|
| 中华人民共和国国家质量监督检验检疫总局 中国国家标准化管理委员会.耐火材料抗碱性试验方法.《中华人民共和国国家标准,GB/T14983-2008》.2008, * |
| 锌与高炉砖衬反应的试验研究;邹祖桥等;《钢 铁 研 究》;20140228;第42卷(第1期);第13-16页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103969424A (en) | 2014-08-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102322623B (en) | Coke oven top waste heat reclaiming system | |
| CN100362119C (en) | Multiple heat resources-electric warming magnesium smelting apparatus and process | |
| CN103969424B (en) | Testing device and testing method for zinc corrosion resistance of refractory lining bricks | |
| CN106594791B (en) | A kind of heat accumulating type heat-preserving boiler | |
| CN106556003A (en) | A kind of energy-saving type heat-preserving boiler | |
| CN103992031A (en) | Method of preparing inorganic mineral fibre by smelting gangue and laterite-nickel ore by utilization of ore-smelting electric furnace | |
| CN107056039B (en) | Utilize the device of liquid blast furnace production mineral wool | |
| CN107490653A (en) | A kind of cupel(lation) furnace | |
| CN102012159B (en) | Continuous combustion type roasting shaft kiln and roasting method of mineral aggregate thereof | |
| CN207556266U (en) | A kind of electrical kiln that oxidation atmosphere is provided | |
| CN202203915U (en) | Cock oven top exhaust heat recovery system | |
| CN201917202U (en) | Continuous burning-roasting shaft kiln | |
| CN202461500U (en) | Efficient thermal insulation structure of steel ladle for refining furnace | |
| CN101693931A (en) | Cooling device at tuyere part of blast furnace | |
| CN204490904U (en) | Blast furnace banking structure | |
| CN106765058A (en) | A kind of energy saving and environment friendly heat-preserving boiler | |
| CN203704649U (en) | Crucible used for induction furnace to produce products such as slag wool, mineral wool, microcrystalline glass andcast stones | |
| CN107162432B (en) | A kind of device of liquid blast furnace production mineral wool | |
| CN207672094U (en) | A kind of continuous annealing furnace for ductile iron pipes heat preservation side wall | |
| CN206207998U (en) | Oxygen enriched molten bath smelting furnace | |
| CN104357607A (en) | Blast furnace roasting method | |
| CN205398662U (en) | Energy -conserving long service life's blast furnace crucibe | |
| CN205316988U (en) | Combination formula furnace wall of hot stove in long -life ore deposit | |
| CN205152160U (en) | Slag gasifier | |
| CN104457284B (en) | Intermediate frequency furnace for sintering multiple volatile substances |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170713 Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Patentee before: Wuhan Iron & Steel (Group) Corp. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150722 Termination date: 20190520 |