CN104353820A - Manufacturing method of permanent layer of hot metal tank - Google Patents
Manufacturing method of permanent layer of hot metal tank Download PDFInfo
- Publication number
- CN104353820A CN104353820A CN201410623744.9A CN201410623744A CN104353820A CN 104353820 A CN104353820 A CN 104353820A CN 201410623744 A CN201410623744 A CN 201410623744A CN 104353820 A CN104353820 A CN 104353820A
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- Prior art keywords
- tank
- hot
- bottom die
- metal bottle
- tank bottom
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/02—Linings
- B22D41/023—Apparatus used for making or repairing linings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
The invention discloses a manufacturing method of a permanent layer of a hot metal tank. The manufacturing method comprises the following steps of 1, hoisting a tank bottom die into a tank body of the hot metal tank, enabling a plurality of support bolts with screw rod length greater than the thickness of the tank bottom die to penetrate through screw holes in the tank bottom die, enabling the end part of the screw rod of each support bolt to extend out of the tank bottom die and weld and connect with the tank body of the hot metal tank, matching a screw cap and the screw rod of each support rod to form a certain distance between the tank bottom die and the tank body of the hot metal tank, casting castable, and vibrating; 2, hoisting a first tank body die into the tank body of the hot metal tank, connecting the bottom part of the first tank body die and the top part of the tank bottom die, casting castable, and vibrating; 3, hoisting a second tank body die into the tank body of the hot metal tank, connecting the bottom part of the second tank body die and the top part of the first tank body die, casting castable, and vibrating. The manufacturing method has the characteristics that the heat isolation effect of the hot metal tank is good, the manufacturing cycle is short, the production preservation is easy, the removal of a tank inner liner is convenient, and the manufacturing method can be widely applied to the technical field of blast furnace smelting.
Description
Technical field
The present invention relates to technical field of blast furnace process, particularly relate to a kind of hot-metal bottle permanent layer manufacture method.
Background technology
Along with blast furnace technology develop rapidly, all technical improves constantly, and blast furnace requires also more and more higher to molten iron splendid attire.Be difficult to meet the production requirement of adjusting structure, operating with full load with the hot-metal bottle of clay brick as liner in the past, the ladle lining of each steel plant is most by Al subsequently
2o
3-SiC-C material replaced.But in the face of the pressure of resistance to material rise in price, need to reduce the cost of resistance to material further while stable hot-metal bottle tank age, this just must change former masonry way.Use permanent layer continuous pouring one-shaping technique for this reason, guarantee production tank, ensure that the resistance to material of hot-metal bottle pouring section can be reused simultaneously.
In order to satisfied ironmaking is to the demand of making steel to hot-metal bottle, the upper and lower procedure connection of better adaptation and fully loaded production requirement, need the guarantor's tank accomplishing " stable, orderly, compact " to produce, and hot-metal bottle supply number of units is stablized, secure safely.Domestic each steel plant have also been made useful exploration in recent years, and such as, Wuhan Iron and Steel Plant iron-smelter has carried out the test of new material, new technology to ZT-100t hot-metal bottle, progressively formed the design feature of self ladle lining and built feature by laying bricks or stones.
ZT-100t ladle lining structure and to build feature by laying bricks or stones as follows:
1) internal layer divides at the bottom of tank and can body two sections, and namely can body is the vertical type permanent layer lightweight thermal insulation brick of three faulted layers to tank deck; Be the composite permanent layer lightweight thermal insulation brick of three faulted layers at the bottom of tank.
2) working lining divides upper and lower three sections; Namely integrated poured, the universal reducing working lining of can body of working lining slag line build by laying bricks or stones with tank at the bottom of work in combination layer build by laying bricks or stones.
Although after hot-metal bottle brick-building art is stable, its tank tends towards stability age, also can complete to protect and produce requirement, in the face of the rise of upstream price, cost pressure is still very large.So iron-smelter carries out integrated poured test in the castable that August 1 to December in 2011 starts to adopt Wuhan steel Hua Naicai furnace charge Co., Ltd to produce to hundred tons of tank permanent layer.Carry out integrated poured to 6 hot-metal bottle permanent layer such as 122#, 130#, 128#, 126#, 138#, 144# and test, its process of the test is the integrated poured operational layer brick of building corresponding position again by laying bricks or stones of segmentation.In this process of the test, want after every section of cast at every turn maintenance after 16 hours the demoulding build working lining by laying bricks or stones again, expend time in length, and by within former 12 hours, completing 8 step masonry methods of 1 tank as a comparison, this test technology known is difficult to meet guarantor's tank production requirement.In addition, this test tank bag wall anchor is welded V-arrangement anchoring piece by 300mm spacing, and because V-arrangement anchoring piece reaches about 80mm in the length of inside liner, after tank uses, overhaul bricking is difficult to remove.And tank wall temperature is high during the operation of this tank, rapid heat dissipation, Yi Jiegai.Just because of there are problems, so iron-smelter stopped this test the end of the year 2012.
From actual operation, the existing following problem of the integrated poured alternative permanent layer lightweight thermal insulation brick of permanent layer:
1. the effect of heat insulation that permanent layer is integrated poured does not reach the effect of lightweight thermal insulation brick.
2. become very difficult because anchoring piece too much in inner tank wall makes overhaul remove liner.
3. not adopting quick-drying balk cargo to carry out cast, to make platform tank build the cycle by laying bricks or stones elongated, is difficult to ensure blast fumance tank.
4. Mold Making not science make can not continuous pouring operation, and build the tank production cycle and spin out.
Also these problems just tired scratches that Liu Gang iron-smelter also be stopped hundred tons of tank permanent layer is integrated poured, and Handan iron-smelter also only achieves the tank permanent layer step pouring segmentation demoulding when hot-metal bottle height turnover rate.
In order to solve the problem, need to improve casting material formula, should effect of heat insulation be ensured, ensure the intensity after cast baking again.Resistance to material intensity be mainly reflected in material shaping after bulk density on, as: now lightweight thermal insulation brick bulk density is at 1.5g/cm
3left and right, thermal conductivity factor (mean temperature 350 ± 25 DEG C)≤0.55W/mk.And be 2.3g/cm the shaping rear bulk density of permanent layer castable in 2011
3left and right.To reach the effect of heat insulation of present permanent layer lightweight thermal insulation brick, must improve casting material formula, intensity and heat insulation on find an equalization point, namely suitably reduce casting material strength, increase heat insulation effect again.
Summary of the invention
The object of the invention is the deficiency in order to overcome above-mentioned background technology, a kind of hot-metal bottle permanent layer manufacture method be provided, have hot-metal bottle good heat-insulation effect, manufacturing cycle short, be easy to protect produce, tank liner dismounting feature easily.
A kind of hot-metal bottle permanent layer manufacture method provided by the invention, comprise the steps: step one, with hanging device, the handling of tank bottom die entered in hot-metal bottle tank body, the carrying bolt multiple spiro rod length being greater than tank bottom die thickness is each passed through the screw in tank bottom die, the screw rod end faces outwards of carrying bolt is stretched out tank bottom die be connected with hot-metal bottle tank body welding, the nut of carrying bolt is coordinated with screw rod tank bottom die and hot-metal bottle tank body are kept at a certain distance away, pour into a mould castable and rapping; Step 2, with hanging device, the first can body mold hoisting is transported in hot-metal bottle tank body, the first can body mold bottom is connected with tank bottom die top, cast castable rapping; Step 3, with hanging device, the second can body mold hoisting is transported in hot-metal bottle tank body, the second can body mold bottom is connected with the first can body die top, cast castable rapping.
In technique scheme, described castable is shaping rear bulk density is 1.8g/cm
3quick dry castable.
In technique scheme, in described step 2, the first card of the first can body mold bottom is embedded in the draw-in groove at tank bottom die top; In described step 3, the second card of the second can body mold bottom is embedded in the draw-in groove of the first can body die top.
In technique scheme, described tank bottom die thickness is 20mm, and the spiro rod length of described carrying bolt is 120mm, and described tank bottom die and hot-metal bottle tank body distance are 100mm, and the thickness of described first can body mould and the second can body mould is 10cm.
In technique scheme, described tank bottom die is one, and described first can body mould and the second can body mould are circumferentially spliced by connecting bolt by six templates respectively.
In technique scheme, described tank bottom die top is provided with the brace summer of " ten " font, wherein a brace summer top is arranged with tank bottom die suspension hook, be provided with the first can body mould suspension hook inside every sheet template of described first can body mould, inside every sheet template of described second can body mould, be provided with the second can body mould suspension hook.
In technique scheme, also comprise step 4, remove the second can body mould, the first can body mould and tank bottom die successively.
In technique scheme, in described step one, described carrying bolt has eight, wherein, a carrying bolt is positioned at the center of tank bottom die, four carrying bolts are circumferentially arranged along the Central Symmetry of tank bottom die, and be arranged symmetrically with four carrying bolts are positioned at tank bottom die top, and remaining three carrying bolts are formed centrally equilateral triangle and arrange and be all arranged on bottom tank bottom die in tank bottom die.
In technique scheme, the spiral shell that described hot-metal bottle inner tank wall is provided with as anchoring piece emits.
In technique scheme, described spiral shell emits at the bottom of the tank of hot-metal bottle tank body and spacing on can body inwall is 350mm, emits the spacing on inwall to be 420mm at tank.
Hot-metal bottle permanent layer manufacture method of the present invention, there is following beneficial effect: use scientific and reasonable castable mould and Quick dry castable zonal cooling cast permanent layer, achieve continuous pouring permanent layer, the disposable integral demoulding, the problem of protecting tank production cycle length can be solved very well.Adopt Quick dry castable, effect of heat insulation is close to lightweight thermal insulation brick.That overhaul tank lining is difficult to be removed in order to solve again, top tank structure anchoring piece should be reduced, at the bottom of tank and can body inwall use the spiral shell of interval 350mm to emit alternative V-arrangement anchoring piece, the hexagonal spiral shell of i.e. wide 45mm × high 25mm emits, and increasing tank emits the spiral shell on inwall to emit spacing distance further, the overhaul being convenient to liner at the bottom of can body and tank is removed, and is more convenient for taking off and emits dismounting liner.
Casting material formula improves, intensity and heat insulation on have found an equalization point, be set in 1.8g/cm by the shaping rear bulk density of castable
3, both ensure that the heat insulation effect of permanent layer, in turn ensure that the intensity of permanent layer.
Wuhan Iron and Steel Plant ZT-100t hot-metal bottle use the present invention can realize the demoulding of continuous pouring disposable integral, ensure permanent layer resistance to material can through more than 3 times overhaul and do not damage, an overhaul can only be stood compared to prior art permanent layer, greatly reduce the loss of the resistance to material of permanent layer, reduce maintenance cost.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of hot-metal bottle permanent layer manufacture method of the present invention;
Fig. 2 is the sectional structure schematic diagram of implementation step hot-metal bottle in a period of time in hot-metal bottle permanent layer manufacture method of the present invention;
Fig. 3 is the plan structure schematic diagram of Fig. 2;
The sectional structure schematic diagram of hot-metal bottle when Fig. 4 is implementation step two in hot-metal bottle permanent layer manufacture method of the present invention;
Fig. 5 is the plan structure schematic diagram of Fig. 4;
Fig. 6 be in Fig. 5 a to structural representation;
The sectional structure schematic diagram of hot-metal bottle when Fig. 7 is implementation step three in hot-metal bottle permanent layer manufacture method of the present invention;
Fig. 8 is the plan structure schematic diagram of Fig. 7;
Fig. 9 be in Fig. 8 b to structural representation;
Figure 10 is the sectional structure schematic diagram of hot-metal bottle before the demoulding in hot-metal bottle permanent layer manufacture method of the present invention;
Figure 11 is the sectional structure schematic diagram of hot-metal bottle after the demoulding in hot-metal bottle permanent layer manufacture method of the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail, but this embodiment should not be construed as limitation of the present invention.
See Fig. 1, hot-metal bottle permanent layer manufacture method of the present invention, comprises the steps:
Step one, see Fig. 2 to Fig. 3, enter in hot-metal bottle tank body 1 with tank bottom die 2 handling that thickness is 20mm by hanging device (not shown), the carrying bolt 3 being 120mm by eight spiro rod lengths is each passed through the screw (not shown) in tank bottom die 2, the screw rod end faces outwards of carrying bolt 3 is stretched out tank bottom die 2 to be weldingly connected with hot-metal bottle tank body 1, the nut of carrying bolt 3 is coordinated with screw rod and makes tank bottom die 2 and hot-metal bottle tank body 1 apart from being 100mm, wherein, a carrying bolt 3 is positioned at the center of tank bottom die 2, four carrying bolts 3 are circumferentially arranged along the Central Symmetry of tank bottom die 2, and be arranged symmetrically with four carrying bolts 3 are positioned at tank bottom die 2 top, remaining three carrying bolts 3 are formed centrally equilateral triangle and arrange in tank bottom die 2, and be all arranged on bottom tank bottom die 2, this arrangement form can guarantee the supporting role of carrying bolt 3 pairs of tank bottom die 2, and tank bottom die 2 loosens when avoiding rapping to pour into a mould, pour into a mould castable and rapping,
Step 2, see Fig. 4 to Fig. 6, enter in hot-metal bottle tank body 1 with the first can body mould 4 handling that thickness is 10cm by hanging device, the first card 5 bottom the first can body mould 4 is embedded in the draw-in groove at tank bottom die 2 top, cast castable rapping;
Step 3, see Fig. 7 to Fig. 9, enter in hot-metal bottle tank body 1 with the second can body mould 6 handling that thickness is 10cm by hanging device, the second card 7 bottom second can body mould 6 is embedded in the draw-in groove at the first can body mould 4 top, castable, from hot-metal bottle tank body 1 tank mouth 300mm, is poured into a mould and rapping in described second can body mould 6 top;
Step 4, remove the second can body mould 6, first can body mould 4 and tank bottom die 2 as shown in Figure 10 successively.
Through above four steps, as shown in figure 11, whole hot-metal bottle ecto-entad is followed successively by hot-metal bottle tank body 1, permanent layer 13 and lightweight thermal insulation brick 14 to the hot-metal bottle after the demoulding.Permanent layer 13 was poured by the present invention before building lightweight thermal insulation brick 14 by laying bricks or stones, and the engineering time used shortens greatly, and permanent layer 13 globality of cast is better than the permanent layer that prior art produces, the circumferential weld phenomenon occurred in avoiding prior art to construct.
Described castable is shaping rear bulk density is 1.8g/cm
3quick dry castable.This castable, under the prerequisite keeping intensity, adds heat insulation effect.Contrast with the testing program of 2011, the scheme of 2011 is because heat insulation effect is poor, rapid heat dissipation, and skin temperature is always more than 220 DEG C, and molten iron easily forms the solidifying lid of crust block, and process crust block coagulates lid operation and can greatly be damaged to resistance to material; And skin temperature of the present invention is always below 220 DEG C, the solidifying lid of crust block is few, the injury caused resistance to material because for the treatment of process is little, so the hot-metal bottle permanent layer that the present invention makes can stand the test of more than three times overhauls, and former test overhaul each time all needs to re-start permanent layer construction.
Described tank bottom die 2 is one, and described first can body mould 4 and the second can body mould 6 are circumferentially spliced by connecting bolt 8 by six templates respectively.
See Fig. 2 to Fig. 3, described tank bottom die 2 top is provided with the brace summer 9 of " ten " font, and wherein brace summer 9 top is arranged with tank bottom die suspension hook 10.See Figure 10, inside every sheet template of described first can body mould 4, be provided with the first can body mould suspension hook 11, inside every sheet template of described second can body mould 6, be provided with the second can body mould suspension hook 12.Hanging device is by triggering tank bottom die suspension hook 10, first can body mould suspension hook 11 and tank bottom die 2, first can body mould 4 and the second can body mould suspension hook 12 handling put in place by the second can body mould suspension hook 12 respectively.
The spiral shell that described hot-metal bottle tank body 1 inwall is provided with as anchoring piece emits (not shown).Described spiral shell to emit at the bottom of the tank of hot-metal bottle tank body 1 spacing on 1.1 and can body 1.2 inwall to be 350mm, emits the spacing on 1.3 inwalls to be 420mm at tank.Spiral shell emits and instead of original V-arrangement anchoring piece, and strengthens the spacing distance in hot-metal bottle inner tank wall further, removes liner when being conducive to overhaul.Tank emits 1.3, at the bottom of can body 1.2, tank 1.1 permanent layer thickness be 100mm.
Described tank bottom die 2 is in ellipsoid globoidal structure, and the cross section of described first can body mould 4 is in the oval and overall tubular little in the large other end in one end, and described second can body mould 6 is in elliptical cylinder.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
The content be not described in detail in this description belongs to the known prior art of professional and technical personnel in the field.
Claims (10)
1. a hot-metal bottle permanent layer manufacture method, is characterized in that: comprise the steps:
Step one, with hanging device, tank bottom die (2) handling is entered in hot-metal bottle tank body (1), the carrying bolt (3) multiple spiro rod length being greater than tank bottom die (2) thickness is each passed through the screw in tank bottom die (2), the screw rod end faces outwards of carrying bolt (3) is stretched out tank bottom die (2) to be weldingly connected with hot-metal bottle tank body (1), the nut of carrying bolt (3) is coordinated with screw rod tank bottom die (2) and hot-metal bottle tank body (1) are kept at a certain distance away, build castable and rapping;
Step 2, with hanging device, the first can body mould (4) handling is entered in hot-metal bottle tank body (1), the first can body mould (4) bottom is connected with tank bottom die (2) top, pours into a mould castable and rapping;
Step 3, with hanging device, the second can body mould (6) handling is entered in hot-metal bottle tank body (1), second can body mould (6) bottom is connected with the first can body mould (4) top, pours into a mould castable and rapping.
2. hot-metal bottle permanent layer manufacture method according to claim 1, is characterized in that: described castable is shaping rear bulk density is 1.8g/cm
3quick dry castable.
3. hot-metal bottle permanent layer manufacture method according to claim 2, is characterized in that: in described step 2, embeds in the draw-in groove at tank bottom die (2) top by first card (5) of the first can body mould (4) bottom; In described step 3, second card (7) of the second can body mould (6) bottom is embedded in the draw-in groove at the first can body mould (4) top.
4. hot-metal bottle permanent layer manufacture method according to claim 3, it is characterized in that: described tank bottom die (2) thickness is 20mm, the spiro rod length of described carrying bolt (3) is 120mm, described tank bottom die (2) is 100mm with hot-metal bottle tank body (1) distance, and the thickness of described first can body mould (4) and the second can body mould (6) is 10cm.
5. hot-metal bottle permanent layer manufacture method according to claim 4, it is characterized in that: described tank bottom die (2) is one, described first can body mould (4) and the second can body mould (6) are circumferentially spliced by connecting bolt (8) by six templates respectively.
6. hot-metal bottle permanent layer manufacture method according to claim 5, it is characterized in that: described tank bottom die (2) top is provided with the brace summer (9) of " ten " font, wherein brace summer (9) top is arranged with tank bottom die suspension hook (10), be provided with the first can body mould suspension hook (11) inside every sheet template of described first can body mould (4), inside every sheet template of described second can body mould (6), be provided with the second can body mould suspension hook (12).
7. hot-metal bottle permanent layer manufacture method according to any one of claim 1 to 6, is characterized in that: also comprise step 4, remove the second can body mould (6), the first can body mould (4) and tank bottom die (2) successively.
8. hot-metal bottle permanent layer manufacture method according to any one of claim 1 to 6, it is characterized in that: in described step one, described carrying bolt (3) has eight, wherein, a carrying bolt (3) is positioned at the center of tank bottom die (2), four carrying bolts (3) are circumferentially arranged along the Central Symmetry of tank bottom die (2), and be arranged symmetrically with four carrying bolts (3) are positioned at tank bottom die (2) top, remaining three carrying bolts (3) are formed centrally equilateral triangle and arrange in tank bottom die (2), and be all arranged on tank bottom die (2) bottom.
9. hot-metal bottle permanent layer manufacture method according to any one of claim 1 to 6, is characterized in that: the spiral shell that described hot-metal bottle tank body (1) inwall is provided with as anchoring piece emits.
10. hot-metal bottle permanent layer manufacture method according to claim 9, it is characterized in that: described spiral shell emits the spacing on (1.1) and can body (1.2) inwall at the bottom of the tank of hot-metal bottle tank body (1) to be 350mm, emits the spacing on (1.3) inwall to be 420mm at tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410623744.9A CN104353820B (en) | 2014-11-07 | 2014-11-07 | A kind of hot-metal bottle permanent layer manufacture method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410623744.9A CN104353820B (en) | 2014-11-07 | 2014-11-07 | A kind of hot-metal bottle permanent layer manufacture method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104353820A true CN104353820A (en) | 2015-02-18 |
| CN104353820B CN104353820B (en) | 2016-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410623744.9A Expired - Fee Related CN104353820B (en) | 2014-11-07 | 2014-11-07 | A kind of hot-metal bottle permanent layer manufacture method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113736946A (en) * | 2021-09-22 | 2021-12-03 | 武汉精鼎科技股份有限公司 | Construction process for KR desulfurization tank bottom permanent layer |
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| JPH05305423A (en) * | 1992-04-24 | 1993-11-19 | Sumitomo Metal Ind Ltd | Method for spirally laying brick in ladle |
| CN101020610A (en) * | 2006-12-08 | 2007-08-22 | 攀钢集团钢城企业总公司 | Poured material for foundry ladle bottom and its pouring process and mold |
| CN101386067A (en) * | 2008-10-28 | 2009-03-18 | 南京钢铁联合有限公司 | Ladle liner and laying technique thereof |
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| CN101767197A (en) * | 2010-01-27 | 2010-07-07 | 莱芜钢铁股份有限公司 | Method for pouring steel ladle working lining |
| CN102407559A (en) * | 2011-11-15 | 2012-04-11 | 赵素志 | Method for pouring working lining of half steel ladle |
-
2014
- 2014-11-07 CN CN201410623744.9A patent/CN104353820B/en not_active Expired - Fee Related
Patent Citations (6)
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|---|---|---|---|---|
| JPH05305423A (en) * | 1992-04-24 | 1993-11-19 | Sumitomo Metal Ind Ltd | Method for spirally laying brick in ladle |
| CN101020610A (en) * | 2006-12-08 | 2007-08-22 | 攀钢集团钢城企业总公司 | Poured material for foundry ladle bottom and its pouring process and mold |
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| CN101637941A (en) * | 2009-05-25 | 2010-02-03 | 莱芜钢铁股份有限公司 | Integral casting technology of hot metal ladle and moulding bed device |
| CN101767197A (en) * | 2010-01-27 | 2010-07-07 | 莱芜钢铁股份有限公司 | Method for pouring steel ladle working lining |
| CN102407559A (en) * | 2011-11-15 | 2012-04-11 | 赵素志 | Method for pouring working lining of half steel ladle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113736946A (en) * | 2021-09-22 | 2021-12-03 | 武汉精鼎科技股份有限公司 | Construction process for KR desulfurization tank bottom permanent layer |
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| CN104353820B (en) | 2016-08-10 |
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Effective date of registration: 20170726 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuchang, Hubei Friendship Road, No. A, block, floor 999, 15 Patentee before: Wuhan Iron & Steel (Group) Corp. |
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Granted publication date: 20160810 Termination date: 20201107 |