CN102296146B - Metal slit-type ladle bottom blowing powder injection apparatus - Google Patents
Metal slit-type ladle bottom blowing powder injection apparatus Download PDFInfo
- Publication number
- CN102296146B CN102296146B CN 201110235141 CN201110235141A CN102296146B CN 102296146 B CN102296146 B CN 102296146B CN 201110235141 CN201110235141 CN 201110235141 CN 201110235141 A CN201110235141 A CN 201110235141A CN 102296146 B CN102296146 B CN 102296146B
- Authority
- CN
- China
- Prior art keywords
- metal
- slit
- powder injection
- gap
- base plate
- 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.)
- Active
Links
Images
Landscapes
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention provides a metal slit-type ladle bottom blowing powder injection apparatus which belongs to the steel refining technical field. The apparatus comprises two parts of a metal slit-type powder injection element and an air accumulating chamber, the metal slit-type powder injection element is connected with the air accumulating chamber through flange bolts; wherein the metal slit-type powder injection element comprises an external metal shell and an refractory material which has slits inside, a metal plate is provided on an inner wall of the slit, a metal base plate is provided on the bottom of the refractory material, a through hole provided on the metal base plate is communicated with the slits, the circumference of the metal base plate is connected with the metal shell, the bottom of the metal plate is connected with the metal base plate, the top of the metal plate is positioned at the top of the slit. The invention has the advantages that the strength for powder injection smelting is enhanced, the strength is high at the high temperature, the metal slits are welded for difficult deformation, the apparatus of the invention has the advantages of good airtight, stable blowing, low manufacture cost, large adjustable scope of power and air amount, long usage life, safety and reliability.
Description
Technical field
The invention belongs to the Steel Refining technical field, particularly a kind of metal slit-type ladle bottom blowing powder injection apparatus.
Background technology
The ladle bottom blowing powder injection refining is the new technology of an emerging creative and broad prospect of application, but to stir environment than steel ladle bottom argon blowing abominable for Working environment because Ladle Bottom dusts, and is faced with many technical problems after the Ladle Bottom powder injection process proposes to be solved.In the middle of the smelting process of dusting, pulvis needs to send into inside, molten bath through the element that dusts, the element design of dusting should solve the pulvis continous-stable and spray into and do not occur to stop up, guarantee again the safe and reliable bleed-out accident of avoiding occuring, should guarantee that pulvis straying quatity scope is adjustable controlled, require again refractory materials wear-and corrosion-resistant long service life, it is the core parts of Ladle Bottom powder injection process.The element that dusts is in the middle of high temperature and strong powder air-flow abrasive environment, and its design and use performance is directly connected to the success or failure of dusting, and is determining that can the Ladle Bottom powder injection process carry out and apply.
In the Ladle Bottom spraying powder refining technique, there is technology to propose to adopt the slit refractory materials to carry out the technique of Ladle Bottom injection refining at present.The element internal that dusts that this technology adopts forms the gap by refractory materials, and pulvis enters by air receiver the element gap of dusting, and sees through the gap and enters the ladle molten bath, this mode, utilize gas as carrier, the solid powder/particle of reactant is directly injected to depths, ladle molten bath, avoided contacting of pulvis and air or slag, enlarged the projection interfacial area, increase the partial concn gradient, strengthened stirring, thereby accelerated mass transfer process, compare with traditional way, its advantage comprises following several respects:
(1) improve the quality of steel: it can reduce the content of oxygen and sulphur in steel, controls oxide compound and Sulfide inclusion form in steel, improves the cutting ability of steel, reduces all directions opposite sex of steel and hydrogen induced cracking susceptibility etc.And be conducive to polymerization and the floating of inclusion; (2) improve refining effect: carrier gas is blown into the depths, molten bath with reaction mass, can accelerate fusing and the dissolving of material, and greatly strengthen reaction area, simultaneously also strong stirring the molten bath, thereby accelerated transmission and reaction process, made the molten bath obtain dynamic conditions preferably; (3) pulvis directly sprays into the depths, molten bath, avoided and the contacting of air and slag, prevented their oxidation, thereby improved the recovery rate of alloy, in addition, dust and to solve the very high element of vapour pressure and the problem that adds of diffusing the poisonous gas element at trace alloying element, steel-making temperature; (4) can adjust accurately molten steel composition, make the more stable quality of steel; (5) equipment is simple, less investment, and process cost is few, and handiness is large, good work environment; (6) improve the throughput of smelting furnace.
Element is obtained certain effect in the ladle bottom blowing powder injection field although this dusts, and has obvious shortcoming:
(1) bottom blowing powder injection is made of refractory materials with the element gap of dusting, refractory materials directly contacts with pulvis, the air-flow that is pollinated abrasion is serious, cause wavelength width of a slit to become large through the airflow scouring that is pollinated for a long time, molten steel infiltrates the gap and stops up the gap, easily cause the bleed-out accident when serious, therefore, dust short work-ing life with refractory materials;
(2) consider from security standpoint, for avoiding occuring the bleed-out accident, the design of refractory materials wavelength width of a slit is as small as possible, this causes the powder air-flow to become large at the gap internal resistance, the air conveying pressure-losses is large, and in ladle, powder air-flow penetration power reduces, impact winding-up metallurgical effect.
Summary of the invention
The deficiency that exists for overcoming prior art, the present invention proposes a kind of metal slit-type ladle bottom blowing powder injection apparatus, by metal slit, solves the powder air-flow and strongly denudes and the pressure process that dusts loses the problems such as large with refractory materials gap inwall dusting.
Technical scheme of the present invention is achieved in that a kind of metal slit-type ladle bottom blowing powder injection apparatus, is comprised of dust element and air receiver two parts of metal slit formula, and the described metal slit formula element that dusts is connected with air receiver by flange bolt;
Wherein, the metal slit formula element that dusts comprises that outside metal casing and inside establishes apertured refractory materials, described gap inwall is provided with metal sheet, refractory materials bottom is provided with the metal bottom surface, the metal bottom surface is provided with through hole and is communicated with the gap, the metal bottom periphery is connected with metal casing, and metal sheet bottom is connected with the metal bottom surface, and the metal sheet top is positioned at the top, gap;
Described metal sheet, its material comprises: stainless steel, heat-resistance stainless steel, carbon element seamless tube;
The thickness of described metal sheet is: 0.05～20mm;
Described metal bottom surface, its material comprises: stainless steel, heat-resistance stainless steel, carbon element seamless tube;
The thickness of described metal base plate is: 0.05～20mm;
Described clear size of opening is identical with the gap.
advantage of the present invention: comprise following several respects: (1) long service life, safe and reliable: metal slit has played enhancement to refractory materials, make brick incrust, the cracking, erosion degree is little, can not occur losing use properties because wearing and tearing cause refractory materials gap thickness to broaden, improve the element work-ing life of dusting, reduced cost, (2) effectively improved the combustion intensity of dusting: metal slit inwall resistance is little, the loss of powder stream pressure is little, can spray into ladle with kinetic energy more, under equal winding-up condition, use this element that dusts to obtain the more jet of kinetic energy in the ladle molten bath, jet characteristics directly affects the penetrativity of jet, the intrusion amount of powder, reaction effect between gas-solid-liquid, mobile and the refractory corrosion of molten metal etc., when energy of the impinging jet is enough high, uniform particles is distributed in the cross section of gap, formation has with the similar homogeneous phase of monophasic fluid characteristic flows, the winding-up metallurgical effect is better, (3) under high temperature, intensity is high, and metal slit welds together, and firmly is not easy distortion, and resistance to air loss is good, and winding-up is stable, (4) applied range, low cost of manufacture can be according to the requirement of metallurgical effect, the Ladle Bottom that can the manufacture multiple pattern element that dusts, as the rectilinear slot formula element that dusts, the annular gap type element etc. that dusts satisfies all kinds of working condition demands, (5) powder tolerance adjustable extent is large: according to metallurgy dust Intensity Design gap total length and gap number, slit design has been improved the dynamic conditions of powder air-flow greatly, make steel spraying powder technique become possibility, powder tolerance variable range is large, can satisfy the requirement of dusting of Ladle Bottom under various conditions.
Description of drawings
Fig. 1 is the assembly drawing of a kind of metal slit-type ladle bottom blowing powder injection element of the present invention;
Fig. 2 is a kind of metal slit-type ladle bottom blowing powder injection element of the present invention metal rectilinear slot formula element schematic diagram that dusts;
Fig. 3 (a) is a kind of metal slit-type ladle bottom blowing powder injection element of the present invention metal rectilinear slot formula element vertical view that dusts;
Fig. 3 (b) is a kind of metal slit-type ladle bottom blowing powder injection element of the present invention metal rectilinear slot formula element metal slit enlarged view that dusts;
Fig. 3 (c) is a kind of metal slit-type ladle bottom blowing powder injection element of the present invention metal rectilinear slot formula element front view that dusts;
Fig. 4 (a) is a kind of metal slit-type ladle bottom blowing powder injection element of the present invention metal ring clearance type element vertical view that dusts;
Fig. 4 (b) is a kind of metal slit-type ladle bottom blowing powder injection element of the present invention metal ring clearance type element front view that dusts;
In figure, 1, refractory materials; 2, gap; 3, metal sheet; 4, metal casing; 5, metal bottom surface; 6, flange bolt; 7, air receiver chamber; 8, powder air delivery tube; 9, screw; I, the metal slit formula element that dusts; II, air receiver.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
a kind of metal slit-type ladle bottom blowing powder injection element of the present invention preparation principle is as follows: the metal slit wall, metal bottom surface and metal shell are welded into one in advance, then even closely knit filling fire resisting material, and every gap of the element that dusts is located, require the junction not have the space, refractory materials closely is connected with metal, after the element that dusts is reinforced moulding, according to on-the-spot brickwork requirement, element carries out mechanical workout (car to dusting, cut, plane, mill etc.), build requirement by laying bricks or stones to guarantee that component profile size and precision meet, with the coupling of furnace lining on every side, the every powder gas channel (gap) of tackling simultaneously the element that dusts checks, cleaning, guarantee that every gap is unimpeded,
Material requires to comprise: refractory materials requires that void content is low, volume density is high, has the ability of resistance to deformation and fracture during carry load under high temperature, and wear-resistant, anti-erosion; Metal casing and metal bottom plane materiel matter can adopt the metallic substance with certain hot strength, reference when this place provides stainless-steel sheet or Carbon Steel Plate as design; Metal sheet employing hot strength is high, wear-resistant, erosion resistant metal material, such as stainless steel, heat-resistance stainless steel or carbon element seamless tube etc.
As shown in Figure 1, be the assembly drawing of a kind of metal slit-type ladle bottom blowing powder injection element of the present invention, be comprised of dust element I and air receiver II of metal slit formula, the metal slit formula element I that dusts is connected with air receiver II by flange bolt 6;
The described metal slit formula element I that dusts comprises refractory materials 1, gap 2, metal sheet 3, metal casing 4 and metal bottom surface 5, the described metal slit formula element I that dusts is round table-like, its outside is surrounded by metal casing 4, its inside is the refractory materials 1 that is provided with gap 2, described gap 2 inwalls are provided with metal sheet 3, refractory materials 1 bottom is provided with metal bottom surface 5, metal bottom surface 5 is provided with through hole and is communicated with gap 2, metal bottom surface 5 peripheries are connected with metal casing 4, metal sheet 3 bottoms are connected with metal bottom surface 5, and metal sheet 3 tops are positioned at the top, gap;
Described metal sheet adopts its material to comprise: stainless steel, heat-resistance stainless steel or carbon element seamless tube;
The thickness of described metal sheet is 1.0mm;
Described metal bottom surface adopts its material to comprise: stainless steel, heat-resistance stainless steel or carbon element seamless tube;
The thickness of described metal base plate is: 1.0mm;
The size of described through hole is identical with the gap;
The width range of described metal slit is: δ=0.05～1.00mm;
The scope of described gap number is: n=8～60;
Described refractory materials inside diameter ranges is: Φ
1=6～300mm;
Described refractory materials external diameter scope is: Φ
2=30～400mm;
The described metal slit formula element heights scope of dusting is: H
0=60～800mm;
Embodiment 1:
A kind of metal rectilinear slot formula of the present embodiment design element that dusts, its profile as shown in Figure 2, this metal rectilinear slot formula element that dusts is round table-like, its outside is provided with metal casing 4, inside is provided with gas permeable brick 1, be provided with gap 2 in gas permeable brick 1, described gap 2 is rectangle, its inwall is provided with metal sheet 3, gas permeable brick 1 bottom is provided with metal bottom surface 5, and metal bottom surface 5 is provided with through hole and is communicated with gap 2, and metal bottom surface 5 peripheries are connected with metal casing 4, metal sheet 3 bottoms are connected with metal bottom surface 5, and metal sheet 3 tops are positioned at the top, gap;
Its metal slit is type linearly, and as shown in Fig. 3 (a)～3 (c), its each parameter designing is as follows:
(1) described refractory materials internal diameter Φ
1Selection as follows: should avoid that brick intracardiac footpath is too small causes the polymerization in the ladle molten bath of powder air-flow to form the air pocket cloth bag, avoid again brick intracardiac footpath excessive, reduce the jet penetration power, to sum up, the present embodiment is got the intracardiac footpath Φ of brick
1=15mm;
(2) described metal slit, its parameter is selected as follows:
the value of wavelength width of a slit δ: in the present embodiment, in the selection molten bath, the molten steel degree of depth is greater than the ladle of 2m, bleed-out must just can not occur less than 0.15mm in gap thickness in theory, when in fact gas supply element gap thickness is the hundreds of micron, bleed-out can not occur, this is to produce a kind of gluey liquid film to have stoped molten steel to infiltrate the gap due to refractory materials under the effect of high-temperature molten steel, the degree of roughness of refractory surface also can affect molten steel and infiltrate the gap, for the generation of avoiding the bleed-out accident with reach best winding-up effect, in the present embodiment, the width value of gas permeable brick is δ=0.15mm,
Choosing of gap length B, number of slots n and slot placement mode: calculate the powder air-flow by total interfacial area according to the combustion intensity of dusting, then determine gap length B and number of slots n, the gap is evenly arranged around gas permeable brick brick core, the design of employing rectilinear slot, it is generally acknowledged, the B/ δ in gap＞10 o'clock can ignore the impact on border, two ends, gap, the present embodiment is got gap length B=15mm, and number of slots is got n=16;
(3) described refractory materials Φ
2Selection as follows: under the prerequisite that guarantees gas permeable brick intensity, according to gas permeable brick brick in-core footpath and slot placement mode value, get Φ in the present embodiment
2=66mm;
(4) the dust element heights design of described metal slit formula is as follows: the metal slit formula element heights of dusting is determined by ladle bottom thickness, the pulvis factor such as accelerating length, erosive velocity in the gap, under the winding-up condition that guarantees safe and feasible, should shorten the element heights of dusting as far as possible, lose along stroke pressure to reduce; And injection refining pulvis used is generally below 300 orders, pulvis acceleration section is no more than 100mm, dust larger to the gap thickness effect, but the impact on gap length is less, can continue to use the Argon stirring judges with the gas permeable brick erosive velocity, the present embodiment is got erosive velocity average out to 5mm/ time of gas permeable brick, and in the present embodiment, the metal slit formula element heights value of dusting is H
0=200mm.
Embodiment 2:
A kind of metal ring clearance type of the present embodiment design element that dusts, its structure is as shown in Fig. 4 (a), Fig. 4 (b), concrete structure comprises refractory materials 1, gap 2, metal sheet 3, metal casing 4 and metal bottom surface 5, inside is provided with gas permeable brick 1, be provided with gap 2 in gas permeable brick 1, described gap 2 ringwise, its inwall is provided with metal sheet 3, gas permeable brick 1 bottom is provided with metal bottom surface 5, metal bottom surface 5 is provided with through hole and is communicated with gap 2, metal bottom surface 5 periphery is connected with metal casing 4, and metal sheet 3 bottoms are connected with metal bottom surface 5, and metal sheet 3 tops are positioned at the top, gap;
Its design parameter design is as follows:
(1) its internal diameter of described refractory materials Φ
1Value is: avoid that brick intracardiac footpath is too small causes the polymerization in the ladle molten bath of powder air-flow to form the air pocket cloth bag, avoid again brick intracardiac footpath excessive, reduce the jet penetration power, to sum up, the present embodiment is got the intracardiac footpath Φ of brick
1=20mm;
(2) its external diameter of described refractory materials Φ
2Value is: under the prerequisite that guarantees gas permeable brick intensity, according to gas permeable brick brick in-core footpath and slot placement mode value, get Φ in the present embodiment
2=80mm;
(3) described annulus spacing each other is designed to: guaranteeing gas permeable brick intensity, avoiding thermal stresses to concentrate, considering the decay of difficulty of processing and jet, Δ d=3～7mm;
(4) described endless metal gap, the value of its wavelength width of a slit is: for the generation of avoiding the bleed-out accident with reach best winding-up effect, in the present embodiment, the width value of gas permeable brick is δ=0.15mm;
(5) the dust value of element heights of described metal ring clearance type is: in the present embodiment, the metal slit formula element heights value of dusting is H
0=200mm;
(6) described annulus number is n=2～10.
Claims (3)
1. metal slit-type ladle bottom blowing powder injection apparatus, formed by dust element and air receiver of metal slit formula, the described metal slit formula element that dusts is connected with air receiver, it is characterized in that: the described metal slit formula element that dusts comprises that outside metal casing and inside establishes apertured refractory materials, described gap inwall is provided with metal sheet, refractory materials bottom is provided with the metal bottom surface, the metal bottom surface is provided with through hole and is communicated with the gap, the metal bottom periphery is connected with metal casing, metal sheet bottom is connected with the metal bottom surface, the metal sheet top is positioned at the top, gap, the thickness of described metal sheet and metal base plate is: 0.05～20mm.
2. metal slit-type ladle bottom blowing powder injection apparatus according to claim 1, it is characterized in that: described metal sheet and metal base plate, its material is: stainless steel.
3. metal slit-type ladle bottom blowing powder injection apparatus according to claim 1, it is characterized in that: described clear size of opening is identical with the gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110235141 CN102296146B (en) | 2011-08-16 | 2011-08-16 | Metal slit-type ladle bottom blowing powder injection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110235141 CN102296146B (en) | 2011-08-16 | 2011-08-16 | Metal slit-type ladle bottom blowing powder injection apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102296146A CN102296146A (en) | 2011-12-28 |
| CN102296146B true CN102296146B (en) | 2013-06-19 |
Family
ID=45356821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110235141 Active CN102296146B (en) | 2011-08-16 | 2011-08-16 | Metal slit-type ladle bottom blowing powder injection apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102296146B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102560009B (en) * | 2012-01-16 | 2014-11-26 | 东北大学 | RH vacuum refining bottom blowing powder injection device |
| CN102643952B (en) * | 2012-04-28 | 2014-06-04 | 东北大学 | Method for obtaining slot length and width of bottom powder injection element of ladle |
| CN104611511B (en) * | 2015-02-02 | 2017-09-29 | 西安宝科流体技术有限公司 | Coreless induction furnace intelligence argon bottom-blowing dusts control system and its control method |
| CN110205444B (en) * | 2019-06-14 | 2021-01-05 | 钢铁研究总院 | Circular seam type bottom blowing air supply brick |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2861175Y (en) * | 2005-12-13 | 2007-01-24 | 东北大学 | Slit-type ladle bottom blowing power injection apparatus |
| CN200978293Y (en) * | 2006-11-22 | 2007-11-21 | 鞍钢集团耐火材料公司 | Narrow slit type air brick capable of increasing blow-opening ratio |
| CN201942701U (en) * | 2011-01-20 | 2011-08-24 | 杨红 | Cluster-type bottom air supply element used for top-bottom combined blowing of converter |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2186858C2 (en) * | 2000-03-13 | 2002-08-10 | ОАО Челябинский металлургический комбинат "МЕЧЕЛ" | Lance for bottom blowing of metal with gases in ladle and method of lance manufacture |
| JP2003231912A (en) * | 2002-02-07 | 2003-08-19 | Kawasaki Refract Co Ltd | Gas blow nozzle |
| JP2007224398A (en) * | 2006-02-27 | 2007-09-06 | Jfe Steel Kk | Bottom-blow tuyere to be used in smelting vessel |
-
2011
- 2011-08-16 CN CN 201110235141 patent/CN102296146B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2861175Y (en) * | 2005-12-13 | 2007-01-24 | 东北大学 | Slit-type ladle bottom blowing power injection apparatus |
| CN200978293Y (en) * | 2006-11-22 | 2007-11-21 | 鞍钢集团耐火材料公司 | Narrow slit type air brick capable of increasing blow-opening ratio |
| CN201942701U (en) * | 2011-01-20 | 2011-08-24 | 杨红 | Cluster-type bottom air supply element used for top-bottom combined blowing of converter |
Non-Patent Citations (2)
| Title |
|---|
| 18t电弧炉底吹用透气砖的研制;贺智勇等;《特殊钢》;19991231;第20卷(第2期);第45页左栏第10-15行及图1 * |
| 贺智勇等.18t电弧炉底吹用透气砖的研制.《特殊钢》.1999,第20卷(第2期),45-47. |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102296146A (en) | 2011-12-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102296146B (en) | Metal slit-type ladle bottom blowing powder injection apparatus | |
| Hara et al. | Continuous pig iron making by microwave heating with 12.5 kW at 2.45 GHz | |
| CN104327881A (en) | Liquid continuous slag-removal fixed bed gasification furnace and gasification method thereof | |
| CN103993116B (en) | Double tower flash iron-smelting furnace and iron smelting method | |
| CN102560009A (en) | RH vacuum refining bottom blowing powder injection device | |
| CN212350352U (en) | Steel ladle structure | |
| CN204325270U (en) | Liquid continuous discharging slag fixed-bed gasification furnace | |
| CN104403694A (en) | Liquid-state continuous slag discharge device and slag discharge method of fixed bed gasification furnace | |
| CN102274958B (en) | Frustum slit type anti-blocking ladle bottom-blown powder injection device | |
| CN206337288U (en) | The three layers of polymer fluidic oxygen guns for converter high effective oxygen blowing | |
| CN102296156B (en) | Ladle bottom blowing power injection device with whirlwind-type flow-smoothing gas storage chamber | |
| CN205526168U (en) | Metal melting is with swift current steel bay | |
| CN201648341U (en) | Multiinjector contraposition-type coal-water slurry pressurized gasifier | |
| CN104449864B (en) | A kind of novel water-coal-slurry pressurized-gasification furnace nozzle and manufacture method thereof | |
| CN210916131U (en) | Novel composite iron notch structure | |
| CN203820824U (en) | Drying and reduction integrated flash ironmaking equipment | |
| CN102628094A (en) | Buried oxygen blowing and decarburization process for electric-arc furnace steelmaking and control method | |
| CN101914647B (en) | Oxygen and coal powder blowing device of pure-oxygen smelting reduction furnace | |
| CN201497327U (en) | Reduction oxidation furnace of extracting phosphorus through heating method | |
| CN212610746U (en) | Material accelerator for mineral powder conveying pipeline in smelting reduction process | |
| CN105855529B (en) | A kind of air brick of the fine Argon Bubble of bottom blowing for tundish refining | |
| CN203820825U (en) | Double-tower flash-speed smelting furnace | |
| CN204311026U (en) | A kind of novel water-coal-slurry pressurized-gasification furnace nozzle | |
| CN106480326B (en) | Lateritic nickel ore open hearth smelting device and method | |
| CN110548877B (en) | Composite heat insulation plate for preparing metal powder through gas atomization |
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 |