PH26200A - An improved method of recovering metals and metal alloys and an improved system therefor - Google Patents
An improved method of recovering metals and metal alloys and an improved system therefor Download PDFInfo
- Publication number
- PH26200A PH26200A PH36004A PH36004A PH26200A PH 26200 A PH26200 A PH 26200A PH 36004 A PH36004 A PH 36004A PH 36004 A PH36004 A PH 36004A PH 26200 A PH26200 A PH 26200A
- Authority
- PH
- Philippines
- Prior art keywords
- coal
- oxygen
- layer
- gas
- static
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 23
- 229910052751 metal Inorganic materials 0.000 title claims description 19
- 239000002184 metal Substances 0.000 title claims description 19
- 150000002739 metals Chemical class 0.000 title claims description 9
- 229910001092 metal group alloy Inorganic materials 0.000 title claims description 7
- 239000007789 gas Substances 0.000 claims description 45
- 230000003068 static effect Effects 0.000 claims description 42
- 239000003245 coal Substances 0.000 claims description 35
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 29
- 229910052760 oxygen Inorganic materials 0.000 claims description 29
- 239000001301 oxygen Substances 0.000 claims description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 20
- 229910052799 carbon Inorganic materials 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 13
- 230000001603 reducing effect Effects 0.000 claims description 12
- 239000002893 slag Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 229910044991 metal oxide Inorganic materials 0.000 claims description 4
- 150000004706 metal oxides Chemical class 0.000 claims description 4
- 239000000567 combustion gas Substances 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- QRSFFHRCBYCWBS-UHFFFAOYSA-N [O].[O] Chemical compound [O].[O] QRSFFHRCBYCWBS-UHFFFAOYSA-N 0.000 claims 1
- XOFYZVNMUHMLCC-ZPOLXVRWSA-N prednisone Chemical compound O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 XOFYZVNMUHMLCC-ZPOLXVRWSA-N 0.000 claims 1
- 238000007872 degassing Methods 0.000 description 6
- 208000028659 discharge Diseases 0.000 description 4
- 229910001021 Ferroalloy Inorganic materials 0.000 description 3
- 229910000604 Ferrochrome Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000011269 tar Substances 0.000 description 2
- NYQDCVLCJXRDSK-UHFFFAOYSA-N Bromofos Chemical compound COP(=S)(OC)OC1=CC(Cl)=C(Br)C=C1Cl NYQDCVLCJXRDSK-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910000616 Ferromanganese Inorganic materials 0.000 description 1
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- -1 ferpo-manganese Inorganic materials 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229960003903 oxygen Drugs 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
- C21B13/0013—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide into a bath of molten iron containing a carbon reductant
- C21B13/002—Reduction of iron ores by passing through a heated column of carbon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/12—Dry methods smelting of sulfides or formation of mattes by gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
- C21B2100/44—Removing particles, e.g. by scrubbing, dedusting
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Manufacture Of Iron (AREA)
Description
oA
WW
26200
The invention relates to a method of recovering metals or metal alloys, in particular ferro-alloys, by reducing metal oxides in a reduction zone forbed by a coal bed flowed through by a reducing gas, as well as a plant for carrying out the method. /
In El=s — O 174 291 a method of melting metals, ..- i.e. copper, lead, zinc, nickel, cobalt and tin, of . oxidic fine-grain non-ferrous metal ores is described, wherein the charging material is charged into a re- duction zone formed by a coal fluidized layer in a melt- down gasifier. When passing this reduction zone, the oxidic charging material is reduced to netal, which is collected in the lower part of the meltdown gasifier.
It has shown that the method according to EP-A 0 174 291 may advantageously be used for reducing oxides reacting with elementary carbon at temperatures below 1,000°C, yet that problems may occur when recovering metals and metal alloys, in particular ferro-alloys, such as ferro-manganese, ferro-chromium and ferrogili- con, which are recoverable from their oxides only at temperatures exceeding 1,000°%¢C using elementary carbon as the reducing agent, since the period of contact of this oxidic charging material which reacts at higher temperatures, with the carbon particles forming the fluidized layer is relatively short.
The invention aims at avoiding these disadvant- ages and difficulties and has as its object to provide ‘a method and a plant of the initially defined kind which make it possible to produce metals and metal alloys, in particular ferro-alloys, such as ferpo-manganese, ferro- chromium and ferrosilicon of lumpy oxidic charging mate— rial in a melt-down gasifier, wherein the metal has such : a high affinity to oxygen that it reacts with elementary carbon at above 1,000%¢ only.
With a method of the initially defined kind this object is achieved according to the invention in that, under the action of gravity, lumpy oxidic charging mate- : rial is guided through a static coal bed comprised of three layers, wherein —~ a bottom layer of degassed coal is provided, which covers a liquid sump of reduced metal and slag, ~ into a middle layer, oxygen or an oxygen—containing gas ig introduced so as to form a hot reducing gas consist ing essentially of CO, and —~ into a top layer, combustion gases of cgrbon particles and oxygen or oxygen-—containing gas are introduced. advantageously, lumpy oxidic charging material bgving a grain size of from 6 to 50 mm, preferably 10 to : 30 mm, is used,
For forming the static bed layers, suitably coal haing a grain size of from 5 to 100 mm, in particular to 30 um, is used.
According to a preferred embodiment, the thick- ness of the middle and top static bed layers is maine 5 tained between 1 and 4 me
A further embodiment of the method according to the invention in characterised in that dust-like carbon particles are separated from the off-gas passing the static bed layers (reduction zones) and that these carbon particles, preferably in the hot state, together with oxygen or oxygen-containing gas are fed to burners di- rected into the top static bed layer.
As the coal, preferably coal maintaining its lumpy character after degassing is used, so that with a grain size range of from 5 to 100 mm, preferably 5 to 30 mm, utilized, at least 50 % of the degassed coal formed after degassing is present within the original grain size . range of from 5 ro 100 mm or 5 to 30 mm, respectively, and the remainder is present as undersize grain.
The method according to the invention offers the advantage that all known advantages of the reduction pro- cesses in shaft furnaces heated with fossile energy are maintained, such as counterflow-heat exchange, metallur— gical reaction with elementary carbon in the static bed, which is necessary for the reduction of oxides of non- /
' : } precious netals, as well as a good separation of metal and slag. Coking or degassing of coal may be carried out without the formation of tar and other condensable compounds. The gas formed during the degassing of the coal acts as additional reducing agent to the reduction gases formed from the gasification of the degassed coal.
A particular advantage of the method consists in that the reduction of oxides of non-precious elements, such as, e.g., silicon, chromium, manganese, can be effected without using electric energy. In the method according to the invention, the energy required for de- gassing the coal is controlled in a simple manner, be- cause the undersize grain (smaller than 5 mm) is dis~ charged with the hot off-gases of the meltdown gasifier, separated, returned into the upper blowing-in zone of oxygen—containing gases and oxidized by means of the oxygen-containing gases, heat being released.
The grain decomposition behaviour is tested such that a grain fraction of from 16 to 20 mm is subjected to degassing for one hour in a chamber which has been preheated to 1,400°C. The volume of the chamber is 12 dn’, After cooling by flushing with cold inert gas, the grain digtribution is determined.
The invention furthermore comprises a plant for carrying out the method with a refractorily lined shaft-— /
shaped meltdown gasifier, which has, in its upper part, charging openings for introducing coal and lumpy oxidic cherging material, as well as a discharge duct for off- gas, the gide wall of the meltdown gasifier being pene-— trated by supply ducts for coal and oxygen or oxygen— containing gas, respectively, and a lower section being provided for collecting molten metal and liquid slage
This plant is characterised in that, under formation of these superposed static bed layers A, B, C — in the region between the bottom static bed layer A and the middle static bed layer B, a ring of blow-in pipes for oxygen or oxygen~-containing gas is provided and — at a distance thereabove, in the region between the mid— dle static bed layer B and the top static bed layer Cy a ring of burners charged with carbon particles and oxy- gen or oxygen—-containing gas, respectively, is provided.
Advantageously, a hot cyclone for separating car- bon particles from the off-gas is provided in the dis-— charge duct for off-gas, and the discharge end of this hot cyclone is in flow connecticn with the ring of burnerses
The method and the plant of the inventicn for carrying out the method are explained in more detail by way of the drawing, which shows a schematic illustration of the meltdown gasifier with additional means con- nected thereto.
A shaft-like meltdown pasifier denoted by 1 has a refractory lining 2. The bottom region of the melt- down gasifier serves for accommodating molten metal 3 and molten slag 4. A tap opening for metal is denoted by 5, and a tap opening for slag is denoted by 6. In the upper part of the meltdown gasifier, a charging open— ing 7 for supplying lumfly coal, as well as a charging opening 9 for lumpy oxidic charging material are provided.
Above the liquid sump 3, 4, the static coal bed is formed, je.eo a bottom layer 4 of degassed coal which is not gas- passed, a middle layer B of degassed coal provided there- above and passed by gas, and a top layer C of lumpy coal provided thereabove and passed by gas,
The side wall of the meltdown gesifier 1 is pene- trated by blow-in-pipes, i.e. by a ring of blow-in pipes : 8 for oxygen or oxygen-containing gases, respectively.
These pipes are arranged in the border region between the non-gas-passed static bed layer A and the static bed layer Bo
At a distance thereabove, i.e. in the border re- gion between layer B and layer C, a ring of burners 10 penetrating the side wall of the mel tdown gasifier 1 is provided, into which a mixture of dust-like carbon parti- /
cles md oxygenm oxygen-containing gas is introduced and wherein the off-nas possess the static bed layers constituting reduction zone. From the upper part of the mel tdown gasifier, a discharge duct 11 guldes the off-gas forwed lo a hot cyclone 12. bust-like carbon particles suspended in the off{- gas are separated in the hot cyclone 12 and fed from the dischorge end of the hot cyclone 12, in which a dosing means 13 is provided, through a duct 14 to the burners 10 arruonoed in a ring. A duct for oxygen- containing gas leading to the burners 10 is denoted by 15. uith the dosing weans 13 the filling degree of the hot cyclone 12 can be requlated and the sepa- rating effect of the hot cyclone 12 can be influenced.
From the u per part of the hot cyclune 12 off-gas is discharged trough duct 16. sdvontageously, the method according to the invention is carried out such that coal and lumpy ' oxidic charying material are commonly introduced throuuh the charging openings in the upper part of the weltdown gasifier 1. The coal is degassed in the static bed layer C. The heat required for degassing is provided, on the one hand, by the hot reducing gases rising from the static bed layer i, and, on the other hand, Ly combustion hest from the carbon
BAD ORIG particles burned by means of oxygen-containing gases in the burrmers 10. The verticel extension of the layer C is selected such that the gas leaving layer
C has a minimum temperature of 950°C. Thereby it is ensured that tars and other condensable compounds are cracked. Thus an obstruction of the top static bed layer C becomes impossible. In practice, a layer thickness of fram 1 to & m has proved to be advant- ageous for layer C. A vertical extension of from 1 to 4 m also proves to be advantageous for static bed layer d. Coal degassed in static bed layer C forms the static bed layer J when it sinks down.
The lumpy oxidic charging waterial is melted in static bed layer U and reduced by the elementary carbon. The heat required For melting and reducing is supplied by gassifying hot degassed coal by means of oxygen-containing gases introduced into the gasi- fier via the blow-in pipes 8. The molten metalfbrm- ing in static bed layer 8 and the molten slag flow down and are collected and tapped below static bed layer HA.
Claims (10)
1. in a method of recovering metals and metal alloys, by reducing metal oxides in a reduction sone formed by a coal bed flowed through by a reduc- ing gas, the improvement comprising providing a three-layer static coal bed having a hottom static bed layer of degassed coal covering a liouid sump of reduced netul and slay, a middle static bed layer, and a top static bed layer, guiding lumpy oxidic charging material under gravity action through said three-layer static coal bed, introducing one of oxygen and an oxygen-con- taining gas into sald middle static bed layer so as to form a hot reducing gas consisting pgsentially of gu, and : feeding combustion gases of carbon particles and one of oxygen-and oxygen-containing gas into said top static bed layer.
Ze A method as set forth in Claim 1, wherein said lumpy oxidic charging material has a grain size of from 6 to 50 mm.
3 A metiod as set forth in Claim 2, wherein said lumpy oxidic charging material has a grain size of from , CL BAD ORIGINAL o!
10 to 30 mm. ba A method as set forth in Claim 1, wherein said static coal bed layers are formed by coal having a grain size of from 5 to 100 m.
5. i+ method as set forth in Claim 4, wherein said coal has a grain size of from 5 to 30 mm.
Ee A method as set forth in Claim 1, wherein the thickness of said middle stutic bed layer and said top static bed layer is maintained between 1 and &4 min «
7. A method as set forth in Claim 1, wherein off- gas passes the static bed layers constituting re- duction zones, further comprising separating duste like carbon particles from said off-gas and feeding said carbon articles together with one of oxygen and oxygen-cantaining gas to burners directed into said tap static bed layer.
Be. A method as set forth in Claim 7, wherein said separated carbon particles are fed in the hot state to said burners.
9. In a system for recovering metals and metal alloys, by reducing metal oxides in a reduction zone formed Ly a coal bed flowed through by a reducing gas \ \ BAD unin = \
and of the type including a refractorily lined shaft-1ike meltdown gasifier having an upper part, a side well end a lower part, the upper part inc lud- ing charging openings for charging coal and lumpy oxidic charging material as well as a discharge duct for off-gas, supply ducts for coal and one of oxygen and an oxygen-containing gas penetrating said side wall of said meltdown gasifier, und said lower part being provided for collecting molten metal and molten 1d slag, the improvenent wherein - a bottom static coal-bed layer, covering a liquid sump of reduced metal and alarm, a middle static coal-hed layer and a top static coal-bhed layer are superposed, - a ring of blow-in pipes for one of oxygen and oxygen-containing yas is provided in a region between the bottom static coal-bed layer and the middle static coal-bed layer and - a ring of burners charged with carbon particles and one of oxygen or oxygen-containing gas is provided at a distance thereabove between said middle static coal-hed layer and sald top static coal-bed layer.
10. A system as set forth in Claim 9, further com- prising a hot cyclone for separating carbon particles GAD ORIGINAL from said off-gas and provided in said discharge duct for said off-gas, said hot cyclone having a discharge end, and means flow-connecting said hot cy- clone discharge end with sald ring of burners.
ERICH UTTENSLHLAGER WERNER L, LEPPLINGER Inventors i cL J
ABSTRACT UF THC pIsCLUSURE: In this method, metals or metal alloys, in particular ferro-olloys, are recovered by reduction of metal oxides in a reduction zone formed by a coal bed flowed through by a reducing yase To obtain metals that hove a high affinity to oxygen, lumpy oxlidic charging material is guided under the action bed layers, wherein a bottom layer of degassed coal covering a liquid sump of reduced metal and slay is crovided. Furthermore, oxygen OT an oxy en-contuining gas is fed into a middle layer to form a hot redueing gas ~ agiaiing esventially of CL, and into a top layer combustion gases of carbon particles and oxygen or oxygen-containing gas are fed. ap ORIGINAL D3
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0288786A AT386007B (en) | 1986-10-30 | 1986-10-30 | METHOD AND SYSTEM FOR THE EXTRACTION OF METALS OR. METAL ALLOYS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| PH26200A true PH26200A (en) | 1992-03-18 |
Family
ID=3541877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PH36004A PH26200A (en) | 1986-10-30 | 1987-10-30 | An improved method of recovering metals and metal alloys and an improved system therefor |
Country Status (16)
| Country | Link |
|---|---|
| JP (1) | JP2572085B2 (en) |
| KR (1) | KR950001910B1 (en) |
| CN (1) | CN1011894B (en) |
| AT (1) | AT386007B (en) |
| AU (1) | AU597119B2 (en) |
| BR (1) | BR8705782A (en) |
| CA (1) | CA1327274C (en) |
| CZ (1) | CZ279400B6 (en) |
| DD (1) | DD262677A5 (en) |
| DE (1) | DE3735965A1 (en) |
| IN (1) | IN171251B (en) |
| PH (1) | PH26200A (en) |
| SK (1) | SK768987A3 (en) |
| SU (1) | SU1547713A3 (en) |
| UA (1) | UA2124A1 (en) |
| ZA (1) | ZA878021B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT386006B (en) * | 1986-10-30 | 1988-06-27 | Voest Alpine Ag | METHOD AND SYSTEM FOR THE EXTRACTION OF METALS OR. METAL ALLOYS |
| CN102974669B (en) * | 2012-11-30 | 2014-12-24 | 宁波思明汽车科技有限公司 | Fusible alloy recycling method for pipe forming |
| US11060792B2 (en) | 2018-03-23 | 2021-07-13 | Air Products And Chemicals, Inc. | Oxy-fuel combustion system and method for melting a pelleted charge material |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IN164687B (en) * | 1984-08-16 | 1989-05-13 | Voest Alpine Ag | |
| SE453304B (en) * | 1984-10-19 | 1988-01-25 | Skf Steel Eng Ab | KIT FOR MANUFACTURE OF METALS AND / OR GENERATION OF BATTLE FROM OXIDE ORE |
| AT382390B (en) * | 1985-03-21 | 1987-02-25 | Voest Alpine Ind Anlagen | METHOD FOR THE PRODUCTION OF LIQUID PIPE IRON OR STEEL PRE-PRODUCTS |
| AT386006B (en) * | 1986-10-30 | 1988-06-27 | Voest Alpine Ag | METHOD AND SYSTEM FOR THE EXTRACTION OF METALS OR. METAL ALLOYS |
-
1986
- 1986-10-30 AT AT0288786A patent/AT386007B/en not_active IP Right Cessation
-
1987
- 1987-10-19 IN IN911/DEL/87A patent/IN171251B/en unknown
- 1987-10-21 AU AU80004/87A patent/AU597119B2/en not_active Ceased
- 1987-10-23 DE DE19873735965 patent/DE3735965A1/en active Granted
- 1987-10-26 ZA ZA878021A patent/ZA878021B/en unknown
- 1987-10-27 SK SK7689-87A patent/SK768987A3/en unknown
- 1987-10-27 CZ CS877689A patent/CZ279400B6/en not_active IP Right Cessation
- 1987-10-28 CA CA000550403A patent/CA1327274C/en not_active Expired - Fee Related
- 1987-10-28 DD DD87308360A patent/DD262677A5/en unknown
- 1987-10-29 UA UA4203623A patent/UA2124A1/en unknown
- 1987-10-29 BR BR8705782A patent/BR8705782A/en not_active IP Right Cessation
- 1987-10-29 SU SU874203623A patent/SU1547713A3/en active
- 1987-10-29 JP JP62274591A patent/JP2572085B2/en not_active Expired - Lifetime
- 1987-10-30 CN CN87107202A patent/CN1011894B/en not_active Expired
- 1987-10-30 KR KR1019870012076A patent/KR950001910B1/en not_active IP Right Cessation
- 1987-10-30 PH PH36004A patent/PH26200A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| UA2124A1 (en) | 1994-12-26 |
| ZA878021B (en) | 1988-04-29 |
| DD262677A5 (en) | 1988-12-07 |
| SU1547713A3 (en) | 1990-02-28 |
| KR950001910B1 (en) | 1995-03-06 |
| CZ768987A3 (en) | 1994-11-16 |
| CN1011894B (en) | 1991-03-06 |
| AU8000487A (en) | 1988-05-05 |
| JP2572085B2 (en) | 1997-01-16 |
| JPS63128132A (en) | 1988-05-31 |
| ATA288786A (en) | 1987-11-15 |
| SK278936B6 (en) | 1998-04-08 |
| BR8705782A (en) | 1988-05-31 |
| CN87107202A (en) | 1988-05-18 |
| CZ279400B6 (en) | 1995-04-12 |
| IN171251B (en) | 1992-08-22 |
| AT386007B (en) | 1988-06-27 |
| DE3735965A1 (en) | 1988-05-05 |
| AU597119B2 (en) | 1990-05-24 |
| KR880005276A (en) | 1988-06-28 |
| DE3735965C2 (en) | 1991-01-10 |
| SK768987A3 (en) | 1998-04-08 |
| CA1327274C (en) | 1994-03-01 |
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