GB2123129A - Improvements in and relating to lances for introducing a flowable medium into a bath of molten metal. - Google Patents
Improvements in and relating to lances for introducing a flowable medium into a bath of molten metal. Download PDFInfo
- Publication number
- GB2123129A GB2123129A GB08318186A GB8318186A GB2123129A GB 2123129 A GB2123129 A GB 2123129A GB 08318186 A GB08318186 A GB 08318186A GB 8318186 A GB8318186 A GB 8318186A GB 2123129 A GB2123129 A GB 2123129A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lance
- bath
- tube
- refractory
- sleeve
- 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.)
- Withdrawn
Links
- 230000009969 flowable effect Effects 0.000 title claims abstract description 12
- 239000002184 metal Substances 0.000 title claims abstract description 11
- 239000011819 refractory material Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 2
- 230000000717 retained effect Effects 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000005253 cladding Methods 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 239000000161 steel melt Substances 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 239000011195 cermet Substances 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/18—Charging particulate material using a fluid carrier
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
- B22D1/002—Treatment with gases
- B22D1/005—Injection assemblies therefor
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4606—Lances or injectors
- C21C5/4613—Refractory coated lances; Immersion lances
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Furnace Charging Or Discharging (AREA)
Abstract
A lance for introducing a flowable medium into a bath of molten metal comprises an inner metallic tube and at least one outer metallic sleeve (3) which is lined on its outer surface with a refractory material (5) and is located around and substantially co-axial with said inner tube. The sleeve may be formed in several sections to enable individual worn sections to be replaced, and so that different sections may be of different grade refractories. <IMAGE>
Description
SPECIFICATION
Improvements in and relating to lances for introducing a flowable medium into a bath of molten metal.
This invention relates to lances for introducing a flowable medium into a bath of molten metal. More especially, the invention concerns lances for injecting a gas, or powered or particulate matter contained in a carrier gas, into a bath of steel in a furnace or ladle.
Hitherto, such lances have been of a consumable material or have been refractory clad to resist wear. Although wear resistant, refractory clad lances have a restricted lifetime because of the harsh environment in which they operate.
It is an object of this invention to provide an improved refractory clad lance.
From one aspect the present invention provides a lance for introducing a flowable medium into a bath of molten metal comprising an inner metallic tube and at least one outer metallic sleeve lined on its outer surface with a refractory material located around and substantially cqaxial with said inner tube.
The inner metallic tube may be formed at its lower end with an outwardly protruding stop member to provide a support for the outer metallic sleeve or sleeves or, alternatively, the lower end of the inner tube may be lined on its outer surface to provide such support.
The refractory lining over the lower end of the tube may be of a 'medium' grade refractory, since in practice this will be submerged in the steel melt throughout the whole ladle or furnace treatment cycle. The refractory lining provided higher up the lance length will typically be of a higher grade refractory where it lies at the mre. aggressive slag line, whereas at the upper end the refractory lining may be a low grade refractory since it will lie above the molten steel and slag and only has to sustain a high temperature environment.
Typically, therefore, there will be three refractory sections and a pricipal advantage of this invention is that only the worn section need by replaced at any time.
The lance tip may be terminated by a refractory nozzle through which the gas or powder enters the melt and the injection of this medium may be effected through a smal ler diameter tube along the lance axis.
According to the present invention in another aspect, there is provided a method of introducing a flowable material into a bath of molten metal contained in a receptacle, in which the flowable material is introduced into the bath through an elongate tube located within a metal tube which is, in turn, located within at least one sleeve lined on its outer surface with a refractory material.
In order that the invention may be fully
understood, two embodiments thereof will
now be described, by way of example, with
reference to the accompanying drawings, in which: Figures i(s) and 1(b) respectively illustrate
a main lance and three refractory clad sleeves
in accordance with the invention;
Figure 2 illustrates an alternative lance in
accordance with the invention; and
Figure 3 illustrates an assembled lance in
accordance with the invention immersed in a
bath of molten steel contained in a ladle.
Referring now to Figs. 1 (a) and 1(b), a mild
steel tube 1 of circular cross-section has a
stop member 2 at one end and is threaded at
its other end to enable it to be coupled to a
lance operating mechanism (not shown).
Three further steel tubes 3 are provided, each
including fins 4 which act as keys to support a a castable refractory 5 which serves as a cladding. These tubes 3 are designed to slip
over the tube 1 in the manner of sleeves to be
supported by the stop member 2, the whole
assembly constituting a lance in accordance
with this invention.
In the embodiment illustrated in Fig. 2, a
mild steel tube 6 is itself formed with fins 4
which act as keys to support a castable refrac
tory 8. One or more refractory clad sleeves 9,
similar to the sleeves 3 illustrated in Fig. 1(b), are then slipped over the upper end of the
tube 6 as before. In the embodiment, the
sleeves 9 are supported by the refractory
cladding 8.
In Fig. 3 a lance, in accordance with the
invention, is shown immersed in a bath of
molten steel 1 2 surmounted by slag 1 3 con
tained in a ladle 10. The lance includes a
refractory tip 14 which is threaded on to the
lower end of the lance and is secured to one
end of a small diameter inner tube 1 5 through which powder contained in a carrier
gas is injected into the steel melt. The central
sleeve 3 is formed with an annular insert 1 5 formed of a high grade refractory material
such as a cermet. The insert is so positioned
that it lies within the highly erosive slag layer
formed on the surface of the steel melt.
In an alternative unillustrated embodiment
the entire cladding of the central sleeve com
prises a high grade refractory such as cermet.
Typically, the refractory cladding at the end
of the lance to be immersed in the steel melt
is a high grade alumina chrome castable whereas the refractory cladding at the lance
upper end is typically a lower grade cement or
alumina silicate castable. As mentioned previ
ously, the central section of the lance is
intended to coincide with the slag line at the
surface of the steel bath, and will typically be
clad with a high grade refractory, e.g. a dense Al2O3 or a cast or pressed cermet. It will be
appreciated that the quality of the refractories
employed depends upon the local environ ment and that any suitable refractory may be selected for any given section since replacement may be readily effected.
The sleeves may be 'free-standing', that is, they need not be secured in place on their supporting tube. This enables the sleeves more readily to accommodate thermal and physical changes occurring in the course of operation. Alternatively, to provide extra rigidity, the sleeves may be calamped into position with a simple lock nut device or a material such as sand may be packed between the tubes 3 and the inner support tube.
Although this invention has been described with reference to the particular embodiments illustrated, it is to be understood that various modifications may be made without departing from the scope of this invention. For example, the sizes of the refractory clad sections need not conform to those shown and two or more than three sections might be used.
Claims (8)
1. A lance for introducing a flowable medium into a bath of molten metal comprises an inner metallic tube and at least one outer metallic sleeve lined on its outer surface with a refractory material located around and substantially coaxial with said inner tube.
2. A lance as claimed in Claim 1 in which the inner metallic sleeve is formed at its lower end with an outwardly protruding stop member to provide a support for the said at least one outer metallic sleeve.
3. A lance as claimed in Claim 1 in which the lower end of the inner metallic sleeve is lined on its outer surface with a refractory material, this lining providing a support for the said at least one outer metallic sleeve.
4. A lance as claimed in any one of the preceding claims in which the refractory lining is retained by outwardly protruding fins formed on the respective tube or sleeve.
5. A lance as claimed in any one of the preceding claims wherein at least three outer sleeves are provided, the refractory linings of each sleeve being different from that of at least one of the other sleeves.
6. A lance as claimed in any one of the preceding claims further comprising an elongate tube positioned within said inner tube and connectable to a source of flowable material.
7. A method of introducing a flowable material into a bath of molten metal contained in a receptacle, in which the flowable material is introduced into the bath through an elongate tube located within a metal tube which is, in turn, located within at least one sleeve lined on its outer surface with a refractory material.
8. A lance for introducing a flowable medium into a bath of molten metal substantially as herein described with reference to Figs.
1(a) and 1(b), or Fig. 2, or Fig. 3 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08318186A GB2123129A (en) | 1982-07-06 | 1983-07-05 | Improvements in and relating to lances for introducing a flowable medium into a bath of molten metal. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8219555 | 1982-07-06 | ||
| GB08318186A GB2123129A (en) | 1982-07-06 | 1983-07-05 | Improvements in and relating to lances for introducing a flowable medium into a bath of molten metal. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8318186D0 GB8318186D0 (en) | 1983-08-03 |
| GB2123129A true GB2123129A (en) | 1984-01-25 |
Family
ID=26283274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08318186A Withdrawn GB2123129A (en) | 1982-07-06 | 1983-07-05 | Improvements in and relating to lances for introducing a flowable medium into a bath of molten metal. |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2123129A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2171187A (en) * | 1985-02-20 | 1986-08-20 | Didier Werke Ag | Sleeve for blowing solid material into molten steel |
| US4779847A (en) * | 1988-02-02 | 1988-10-25 | Rodway Jack L | Metallurgical injection lance |
| GB2365513A (en) * | 2000-08-04 | 2002-02-20 | Pyrotek Engineering Materials | Refractory components for use in metal producing processes |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1323448A (en) * | 1970-11-30 | 1973-07-18 | British Steel Corp | Aluminium/refractory-coated lance |
| GB2021242A (en) * | 1977-12-10 | 1979-11-28 | Duport Steels Ltd | Blowing Lance for Solid Materials |
| GB2066733A (en) * | 1979-03-16 | 1981-07-15 | Hoeganaes Ab | Refractory lining for a metal pipe |
| GB1600368A (en) * | 1977-08-24 | 1981-10-14 | Stein Refractories | Metallurgical immersion blowing lances |
-
1983
- 1983-07-05 GB GB08318186A patent/GB2123129A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1323448A (en) * | 1970-11-30 | 1973-07-18 | British Steel Corp | Aluminium/refractory-coated lance |
| GB1600368A (en) * | 1977-08-24 | 1981-10-14 | Stein Refractories | Metallurgical immersion blowing lances |
| GB2021242A (en) * | 1977-12-10 | 1979-11-28 | Duport Steels Ltd | Blowing Lance for Solid Materials |
| GB2066733A (en) * | 1979-03-16 | 1981-07-15 | Hoeganaes Ab | Refractory lining for a metal pipe |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2171187A (en) * | 1985-02-20 | 1986-08-20 | Didier Werke Ag | Sleeve for blowing solid material into molten steel |
| FR2577451A1 (en) * | 1985-02-20 | 1986-08-22 | Didier Werke Ag | SLEEVE FOR THE INFLUENATION OF SOLID SUBSTANCES IN A FUSED METAL BATH |
| US4779847A (en) * | 1988-02-02 | 1988-10-25 | Rodway Jack L | Metallurgical injection lance |
| WO1989007157A1 (en) * | 1988-02-02 | 1989-08-10 | Rodway Jack L | Improved metallurgical injection lance |
| GB2365513A (en) * | 2000-08-04 | 2002-02-20 | Pyrotek Engineering Materials | Refractory components for use in metal producing processes |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8318186D0 (en) | 1983-08-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |