CA1042494A - Apparatus for movement of charge within an electric smelting furnace - Google Patents
Apparatus for movement of charge within an electric smelting furnaceInfo
- Publication number
- CA1042494A CA1042494A CA212,004A CA212004A CA1042494A CA 1042494 A CA1042494 A CA 1042494A CA 212004 A CA212004 A CA 212004A CA 1042494 A CA1042494 A CA 1042494A
- Authority
- CA
- Canada
- Prior art keywords
- charge
- annular member
- furnace
- movement
- pot
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
- F27B3/08—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces heated electrically, with or without any other source of heat
- F27B3/085—Arc furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
- F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
- F27B3/18—Arrangements of devices for charging
- F27B3/183—Charging of arc furnaces vertically through the roof, e.g. in three points
-
- 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
- F27D11/00—Arrangement of elements for electric heating in or on furnaces
-
- 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
- F27D11/00—Arrangement of elements for electric heating in or on furnaces
- F27D11/08—Heating by electric discharge, e.g. arc discharge
-
- 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
- F27D2003/0001—Positioning the charge
- F27D2003/0002—Positioning the charge involving positioning devices, e.g. buffers, buffer zones
-
- 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
- F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
- F27D2003/0038—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities comprising shakers
-
- 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
- F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
- F27D2003/0083—Means for stirring the charge
-
- 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
- F27D2003/0085—Movement of the container or support of the charge in the furnace or in the charging facilities
- F27D2003/0087—Rotation about a vertical axis
Abstract
Abstract of the Disclosure An apparatus for moving the charge in an electric smelting furnace is disclosed.
The apparatus comprises an annular member disposed within the confines of the furnace pot, said annular member having means for moving the charge towards the center of the pot when the annular member is oscillated or rotated.
The apparatus comprises an annular member disposed within the confines of the furnace pot, said annular member having means for moving the charge towards the center of the pot when the annular member is oscillated or rotated.
Description
The p-resent invent:ion relatcs to electr.ic smeLting furnaces and more particularly to an apparatus for moving the charge in the electric furnace pot towards the center o~ the furnace where the electrodes are positioned.
It is well ~nown in the smel~ing industry that it is desirable to cause movement o~ the charge in the sm21ting furnace. This will help in reduction of ormation of crusts and hangings in the furnace and will also result in a more even heat distribution. One known method of cau.sing movement of the charge is to rotate the furnace pot. In conjunction with this there is also usually employed mechanical stoking or levelin~ of the charge surface.
Rotation of the furnace pot has the special advantage that it results in more even wear of the furnace lining materia , A disadvantage to rotation of the furnace pot is that such procedure is limited to un~overed furnaces and further that secondary movement such as.the before-mentioned stoking.
or the like must also be employed. . ..
It is also known that sinking of the charge will -vary to a great degree across the furnace pot area. The Q~g ~e consumption of charge is largest within the ~r~Rag~e formed by th~ electrodes and the consumption of c'narge d.ecreases as the charge approaches the rim of the furnace pot. This uneven consumption of charge causes a number of d.isadvantageous conditions in the smelting process, -the magnitud.e of .
, -2-' ,' ,' ' ~ ' ~` . ''~' .. . -- . -.-. - . . . ~
: . : , ~ J ~
~hich will var~ dep~n~ing upon the ~urnace type and the type o~ smelting product. For exampLe, the concentration of dust will be comparatively very high in the areas where the consumption o~ charge is smaller and this high concen-tration of dust will result in poor gas permeability which gives uneven heat distribution. This in turn causes poor pre-reduction of the solid charge in the furnace which results in the formation of crusts and hangings. Because of the collection of gas in these areas 7 explosions can-resultO Furthermore, the electrical resistc~nce of thecharge wilL vary considerably and the current fr~m the electrodes can travel along unwanted paths. There is further the possibility of formation of Irfalse bottoms~
and general clo~ging up of the furnace pot which wi~l lead ~o incorrect submersion of the electrodes. Another potential problem is that the draining between the electrodes will be poor and the ~apping conditions will be difficul~.
In accordance with the present invention, these problems are substantially alleviated by the use of an apparatus which gives the charge an approximate horiæontal movement in a direction to~ards the center of the urnace, i.e., towards the electrode triangle. Such apparatus is of use in both uncovered furnaces where it can replace mechanical stoking and in covered furnaces where it can effect movement o-f the charge. With the apparatus of the uresent lnven-tion the -tendency for -the furnace to encounter the disadvantages hereinbefore mentioned will be substantially reduced.
In one particular aspect the present invention provides in an electric smelting furnace having a furnace pot for containing a charge, the improvement comprising at least one annular member with-in the confines of the furnace pot, each said annular member being adapted for angular displacement in at least one direction about its ; axis and including means on each said annular member effective to move the charge towards the center of the furnace pot when each said annular member is angularly displaced about its axis, The axis of the annular member is preferably coaxial with the axis of the furnace pot. The annular member can be rotated as for example with tooth gear transmissions or can be oscillated as for example with hydraulic cylinders.
On the inner side of the annular member are provided means for effecting movement of the furnace charge. These means are pre-ferably positioned so that they will exert a pressure against the charge which will cause the charge to move inwardly towards the center of the surface. The particular shape of the means for effecting movement of the charge is not critical but it is pre-ferred that they be chordal segments of the annular member. It is, of course, appreciated that the height and width of these chordal segments in conjunction with the speed of rotation or oscillation of the annular member will directly affect the movement of the charge and in order to have variable movement of the charge, one or more and preferably each j C/~,, . ~
, : : : .
1~4J2 ~ ~
of the~e factors Ls m~de variable.
It is prc~erable thak the annular member be of such size that an annular channel exists between the annular member and the furnace pot wall. In thi.s manner~ charge components can be supplied to the annular channel an~
thence move into ~he main furnace charge by movement of the annular member. This construction permits even distribution of the charge c.omponent by making it un-necessary to add it directly to the center of the ch~rge where it migh~ cause an over concentratiort while at the same time giving it movement ~rom.the furnace pot wall towards the center o~ the charge 50 that the charge component does no-t sirmply remain near the ~urnace pot wall where movement of the charge is normally at the lowest. Provision of this annular channel also permits the increased consumption of fines since means are provided for continuous movement of the fines towards the center of the char~e thus eliminating poor gas perrteability due to high concentrations of d.ust and th2 other disadvantages which result from poor gas permeability.
These and other aspects of the present invention may be more fully und.erstood by reference to the dra~in~s in which:
Fig. 1 is a vertical section through the midd.le of a smelting furn~ce includi.ng one embodiment of the charge , ..
movin~7 means of t~le prese~nt .inVCtltiOn;
Fi~. 2 is a top view of the complete furnace of Fig. l; and Fig. 3 shows a partial section of a furnace accord.ing to the present invention with a plurality of charge moving members.
Referring now to Figs. 1 and. 2, there is shown a furnace pot 10 with lining 12 and electrodes 14 positioned in triangular relationship in the center thereo~. A
molten bath 16 has been established by supplying charge to the electrodes and the solid charge is 18. In accord.ance with the present invention, an annular member 20 is positioned within the furnace pot 10. The annular member has means for effecting movement of ~te solid charge towards the trian~le o~ electrodes and in the drawing these are shown as chordal segments 22 o~ the annular member. The annular body is supported on the rim 24 of the furnace pot 10 by ball bearings 26 in engagement therewith affixed to supporting arms 28. Hydraulic cylinders 30 are also 20 connected. to supporting arms 2.8 to ef~ect oscillatory . ::
movemen~ o~ the annular member by "push-pull" movement of the pistons 3~ of the hyd.raulic cylinders. It will, of course, be understood that any suitable means can be employed. to eEfect rotatory and oscillatory movemen~
o the annular member 20.
l~Z~4 ~' ' . .
.... .
~ J~ 4 ;~ 4 a~ 4 The particulAr con~lguratlon of memberY 22 1~ not limlted to the chordal 3egments shown but should have a ~hape such that thay wlll effect movement of the charge tGwards the center of the furnace pot. Nsturally, the shape of the member~ 22 should be such that they do ~ot place an unreasonably high torque on the annulsr memb~r 20. Since the amount of torque whlch will be placed on the snnular me~ber will depend on the condition of the charge, the shape of th~ members 22 can be made adJustable either with respect to height or width 90 that the movement o~ the charge can -~
be increased or decreased as desired. As mentioned hereinbefore, movement of the ~harge will also be affected by the speed of rotatory or o~cillatory movemen~ and thls i8 also pre;Eerably made ~d~ustable.
An annular channel 34 iY preerably provided for receipt of charge compouent~, fines and the llke. The exact dimension of the a~nular channel is not critical but i~ should be large anough o ~eceive ~he charge component or ;Eines wlthout the~r spilling over lnto the central poxtion 36 of the charge a~d the annular cbannel is preferably o;E uniEorm thlck~ess throughout 2G by making the an~ular member coaxlal with the a~is 3~ oE ~he : f~rnace pot~ It ~111 ~e understood that whlle a triangle o~
electrodes i~9 certalnly preferred~ any other arrangeme~t of .
: electrodes ca~ be employed lf aesired~
- ~ . As ~hown in Flgure 3 9 lt iS also posslble t~
employ 8 plurality o annular members 2n with means 2~ :Eor efec~
l~g ~ovemen~ o~ the charge. In such case, howe~er, it ls preer-sble that the horizontal force exerted hy eac~ annular member 20 ~::
have lts effect below the lower rlm of the rl~ ~o whlch lt 1~ :
ad~aoent on 'che :Inslde o:~ the furnaca pot as sho~n in the drawln~ ;
It w.tll. be nnderstood that the clalms are intende~
~llh~
~6~4~49~
to cover all change~ ant modiflcat:lona of the preferred embodlm¢nt~
of the lnventionp herein chosen or the purpose of illustration, which do not conseitute departures from the splrit and scope of the lnvention.
..
' ' , - : :
' ~
:, .
: - ~ :
: , ~ . ' ' ' ;
. , , :
- ' -: ~1/~3 ::
.
-.
It is well ~nown in the smel~ing industry that it is desirable to cause movement o~ the charge in the sm21ting furnace. This will help in reduction of ormation of crusts and hangings in the furnace and will also result in a more even heat distribution. One known method of cau.sing movement of the charge is to rotate the furnace pot. In conjunction with this there is also usually employed mechanical stoking or levelin~ of the charge surface.
Rotation of the furnace pot has the special advantage that it results in more even wear of the furnace lining materia , A disadvantage to rotation of the furnace pot is that such procedure is limited to un~overed furnaces and further that secondary movement such as.the before-mentioned stoking.
or the like must also be employed. . ..
It is also known that sinking of the charge will -vary to a great degree across the furnace pot area. The Q~g ~e consumption of charge is largest within the ~r~Rag~e formed by th~ electrodes and the consumption of c'narge d.ecreases as the charge approaches the rim of the furnace pot. This uneven consumption of charge causes a number of d.isadvantageous conditions in the smelting process, -the magnitud.e of .
, -2-' ,' ,' ' ~ ' ~` . ''~' .. . -- . -.-. - . . . ~
: . : , ~ J ~
~hich will var~ dep~n~ing upon the ~urnace type and the type o~ smelting product. For exampLe, the concentration of dust will be comparatively very high in the areas where the consumption o~ charge is smaller and this high concen-tration of dust will result in poor gas permeability which gives uneven heat distribution. This in turn causes poor pre-reduction of the solid charge in the furnace which results in the formation of crusts and hangings. Because of the collection of gas in these areas 7 explosions can-resultO Furthermore, the electrical resistc~nce of thecharge wilL vary considerably and the current fr~m the electrodes can travel along unwanted paths. There is further the possibility of formation of Irfalse bottoms~
and general clo~ging up of the furnace pot which wi~l lead ~o incorrect submersion of the electrodes. Another potential problem is that the draining between the electrodes will be poor and the ~apping conditions will be difficul~.
In accordance with the present invention, these problems are substantially alleviated by the use of an apparatus which gives the charge an approximate horiæontal movement in a direction to~ards the center of the urnace, i.e., towards the electrode triangle. Such apparatus is of use in both uncovered furnaces where it can replace mechanical stoking and in covered furnaces where it can effect movement o-f the charge. With the apparatus of the uresent lnven-tion the -tendency for -the furnace to encounter the disadvantages hereinbefore mentioned will be substantially reduced.
In one particular aspect the present invention provides in an electric smelting furnace having a furnace pot for containing a charge, the improvement comprising at least one annular member with-in the confines of the furnace pot, each said annular member being adapted for angular displacement in at least one direction about its ; axis and including means on each said annular member effective to move the charge towards the center of the furnace pot when each said annular member is angularly displaced about its axis, The axis of the annular member is preferably coaxial with the axis of the furnace pot. The annular member can be rotated as for example with tooth gear transmissions or can be oscillated as for example with hydraulic cylinders.
On the inner side of the annular member are provided means for effecting movement of the furnace charge. These means are pre-ferably positioned so that they will exert a pressure against the charge which will cause the charge to move inwardly towards the center of the surface. The particular shape of the means for effecting movement of the charge is not critical but it is pre-ferred that they be chordal segments of the annular member. It is, of course, appreciated that the height and width of these chordal segments in conjunction with the speed of rotation or oscillation of the annular member will directly affect the movement of the charge and in order to have variable movement of the charge, one or more and preferably each j C/~,, . ~
, : : : .
1~4J2 ~ ~
of the~e factors Ls m~de variable.
It is prc~erable thak the annular member be of such size that an annular channel exists between the annular member and the furnace pot wall. In thi.s manner~ charge components can be supplied to the annular channel an~
thence move into ~he main furnace charge by movement of the annular member. This construction permits even distribution of the charge c.omponent by making it un-necessary to add it directly to the center of the ch~rge where it migh~ cause an over concentratiort while at the same time giving it movement ~rom.the furnace pot wall towards the center o~ the charge 50 that the charge component does no-t sirmply remain near the ~urnace pot wall where movement of the charge is normally at the lowest. Provision of this annular channel also permits the increased consumption of fines since means are provided for continuous movement of the fines towards the center of the char~e thus eliminating poor gas perrteability due to high concentrations of d.ust and th2 other disadvantages which result from poor gas permeability.
These and other aspects of the present invention may be more fully und.erstood by reference to the dra~in~s in which:
Fig. 1 is a vertical section through the midd.le of a smelting furn~ce includi.ng one embodiment of the charge , ..
movin~7 means of t~le prese~nt .inVCtltiOn;
Fi~. 2 is a top view of the complete furnace of Fig. l; and Fig. 3 shows a partial section of a furnace accord.ing to the present invention with a plurality of charge moving members.
Referring now to Figs. 1 and. 2, there is shown a furnace pot 10 with lining 12 and electrodes 14 positioned in triangular relationship in the center thereo~. A
molten bath 16 has been established by supplying charge to the electrodes and the solid charge is 18. In accord.ance with the present invention, an annular member 20 is positioned within the furnace pot 10. The annular member has means for effecting movement of ~te solid charge towards the trian~le o~ electrodes and in the drawing these are shown as chordal segments 22 o~ the annular member. The annular body is supported on the rim 24 of the furnace pot 10 by ball bearings 26 in engagement therewith affixed to supporting arms 28. Hydraulic cylinders 30 are also 20 connected. to supporting arms 2.8 to ef~ect oscillatory . ::
movemen~ o~ the annular member by "push-pull" movement of the pistons 3~ of the hyd.raulic cylinders. It will, of course, be understood that any suitable means can be employed. to eEfect rotatory and oscillatory movemen~
o the annular member 20.
l~Z~4 ~' ' . .
.... .
~ J~ 4 ;~ 4 a~ 4 The particulAr con~lguratlon of memberY 22 1~ not limlted to the chordal 3egments shown but should have a ~hape such that thay wlll effect movement of the charge tGwards the center of the furnace pot. Nsturally, the shape of the member~ 22 should be such that they do ~ot place an unreasonably high torque on the annulsr memb~r 20. Since the amount of torque whlch will be placed on the snnular me~ber will depend on the condition of the charge, the shape of th~ members 22 can be made adJustable either with respect to height or width 90 that the movement o~ the charge can -~
be increased or decreased as desired. As mentioned hereinbefore, movement of the ~harge will also be affected by the speed of rotatory or o~cillatory movemen~ and thls i8 also pre;Eerably made ~d~ustable.
An annular channel 34 iY preerably provided for receipt of charge compouent~, fines and the llke. The exact dimension of the a~nular channel is not critical but i~ should be large anough o ~eceive ~he charge component or ;Eines wlthout the~r spilling over lnto the central poxtion 36 of the charge a~d the annular cbannel is preferably o;E uniEorm thlck~ess throughout 2G by making the an~ular member coaxlal with the a~is 3~ oE ~he : f~rnace pot~ It ~111 ~e understood that whlle a triangle o~
electrodes i~9 certalnly preferred~ any other arrangeme~t of .
: electrodes ca~ be employed lf aesired~
- ~ . As ~hown in Flgure 3 9 lt iS also posslble t~
employ 8 plurality o annular members 2n with means 2~ :Eor efec~
l~g ~ovemen~ o~ the charge. In such case, howe~er, it ls preer-sble that the horizontal force exerted hy eac~ annular member 20 ~::
have lts effect below the lower rlm of the rl~ ~o whlch lt 1~ :
ad~aoent on 'che :Inslde o:~ the furnaca pot as sho~n in the drawln~ ;
It w.tll. be nnderstood that the clalms are intende~
~llh~
~6~4~49~
to cover all change~ ant modiflcat:lona of the preferred embodlm¢nt~
of the lnventionp herein chosen or the purpose of illustration, which do not conseitute departures from the splrit and scope of the lnvention.
..
' ' , - : :
' ~
:, .
: - ~ :
: , ~ . ' ' ' ;
. , , :
- ' -: ~1/~3 ::
.
-.
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In an electric smelting furnace having a furnace pot for containing a charge, the improvement comprising at least one annular member within the confines of the furnace pot, each said annular member being adapted for angular displacement in at least one direction about its axis and including means on each said an-nular member effective to move the charge towards the center of the furnace pot when each said annular member is angularly displaced about its axis.
2. The apparatus of claim 1 wherein the angular desplace-ment is rotation of each said annular member about its axis.
3. The apparatus of claim 1 wherein the angular displace-ment is oscillation of each said annular member about its axis.
4. The apparatus of claim 3 wherein the oscillation is effected by at least one hydraulic cylinder.
5. The apparatus of claim 1 wherein the means on the annular member effective to move the charge comprises members affixed to the annular member and of the shape of chordal segments of the annular member.
6. The apparatus of claim 1 wherein there are at least two annular members.
7. The apparatus of claim 6 wherein each annular member is effective to move the charge below the adjacent inner annular member.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO4093/73A NO131903C (en) | 1973-10-23 | 1973-10-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1042494A true CA1042494A (en) | 1978-11-14 |
Family
ID=19880067
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA212,004A Expired CA1042494A (en) | 1973-10-23 | 1974-10-22 | Apparatus for movement of charge within an electric smelting furnace |
Country Status (19)
| Country | Link |
|---|---|
| US (1) | US3895175A (en) |
| JP (1) | JPS553631B2 (en) |
| BE (1) | BE821273A (en) |
| BR (1) | BR7408790D0 (en) |
| CA (1) | CA1042494A (en) |
| CH (1) | CH577667A5 (en) |
| ES (1) | ES431104A1 (en) |
| FI (1) | FI56588C (en) |
| FR (1) | FR2248478B1 (en) |
| GB (1) | GB1480805A (en) |
| IN (1) | IN141793B (en) |
| IT (1) | IT1022684B (en) |
| NO (1) | NO131903C (en) |
| PH (1) | PH14781A (en) |
| PL (1) | PL91839B1 (en) |
| SE (1) | SE403931B (en) |
| SU (1) | SU906394A3 (en) |
| YU (1) | YU36815B (en) |
| ZA (1) | ZA746224B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5233809A (en) * | 1975-09-12 | 1977-03-15 | Elkem Spigerverket As | Gas collecting apparatus for electric smelting furnace |
| USRE30937E (en) * | 1975-09-17 | 1982-05-18 | Elkem-Spigerverket A/S | Apparatus for gas collection in open electric smelting furnaces |
| US4005252A (en) * | 1975-09-17 | 1977-01-25 | Elkem-Spigerverket | Apparatus for gas collection in open electric smelting furnaces |
| NO147647C (en) * | 1980-02-27 | 1983-06-01 | Elkem As | DEVICE FOR ROTATION OF OVEN POTS FOR MELTING OR REDUCING OVEN. |
| AT386009B (en) * | 1986-10-30 | 1988-06-27 | Voest Alpine Ag | METHOD AND OVEN FOR MELTING FINE PARTICULAR MATERIAL, ESPECIALLY METAL OR METAL OXIDE CONTAINING DUST |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1830992A (en) * | 1929-04-13 | 1931-11-10 | Siemens Ag | Electric furnace |
| US2738373A (en) * | 1950-03-22 | 1956-03-13 | Monsanto Chemicals | Method and means of charging and operating electrical furnaces |
| US2794843A (en) * | 1954-12-24 | 1957-06-04 | Electrokemisk As | Automatic stoking mechanism for electric furnaces and method of operation |
| US3258256A (en) * | 1963-10-28 | 1966-06-28 | Frank W Brooke | Mechanical rabble |
-
1973
- 1973-10-23 NO NO4093/73A patent/NO131903C/no unknown
-
1974
- 1974-09-30 ZA ZA00746224A patent/ZA746224B/en unknown
- 1974-10-07 FI FI2924/74A patent/FI56588C/en active
- 1974-10-08 IT IT28187/74A patent/IT1022684B/en active
- 1974-10-15 YU YU2755/74A patent/YU36815B/en unknown
- 1974-10-17 ES ES431104A patent/ES431104A1/en not_active Expired
- 1974-10-17 CH CH1395574A patent/CH577667A5/xx not_active IP Right Cessation
- 1974-10-17 PH PH16428A patent/PH14781A/en unknown
- 1974-10-18 BE BE149709A patent/BE821273A/en not_active IP Right Cessation
- 1974-10-22 IN IN2332/CAL/74A patent/IN141793B/en unknown
- 1974-10-22 GB GB45646/74A patent/GB1480805A/en not_active Expired
- 1974-10-22 PL PL1974175033A patent/PL91839B1/pl unknown
- 1974-10-22 SU SU742073334A patent/SU906394A3/en active
- 1974-10-22 SE SE7413278A patent/SE403931B/en unknown
- 1974-10-22 BR BR8790/74A patent/BR7408790D0/en unknown
- 1974-10-22 CA CA212,004A patent/CA1042494A/en not_active Expired
- 1974-10-22 US US516952A patent/US3895175A/en not_active Expired - Lifetime
- 1974-10-23 JP JP12153974A patent/JPS553631B2/ja not_active Expired
- 1974-10-23 FR FR7435620A patent/FR2248478B1/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CH577667A5 (en) | 1976-07-15 |
| US3895175A (en) | 1975-07-15 |
| DE2450123B2 (en) | 1976-02-26 |
| IT1022684B (en) | 1978-04-20 |
| IN141793B (en) | 1977-04-16 |
| SE403931B (en) | 1978-09-11 |
| BR7408790D0 (en) | 1975-09-23 |
| FR2248478B1 (en) | 1978-11-24 |
| YU275574A (en) | 1982-06-18 |
| FI56588B (en) | 1979-10-31 |
| FI56588C (en) | 1980-02-11 |
| ES431104A1 (en) | 1976-11-01 |
| GB1480805A (en) | 1977-07-27 |
| PL91839B1 (en) | 1977-03-31 |
| SE7413278L (en) | 1975-04-24 |
| NO131903B (en) | 1975-05-12 |
| BE821273A (en) | 1975-02-17 |
| YU36815B (en) | 1984-08-31 |
| SU906394A3 (en) | 1982-02-15 |
| FR2248478A1 (en) | 1975-05-16 |
| JPS5067707A (en) | 1975-06-06 |
| PH14781A (en) | 1981-12-09 |
| ZA746224B (en) | 1976-05-26 |
| NO131903C (en) | 1975-08-20 |
| FI292474A (en) | 1975-04-24 |
| DE2450123A1 (en) | 1975-04-24 |
| JPS553631B2 (en) | 1980-01-25 |
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