US20050199095A1 - Method for producing blister copper - Google Patents
Method for producing blister copper Download PDFInfo
- Publication number
- US20050199095A1 US20050199095A1 US10/517,506 US51750604A US2005199095A1 US 20050199095 A1 US20050199095 A1 US 20050199095A1 US 51750604 A US51750604 A US 51750604A US 2005199095 A1 US2005199095 A1 US 2005199095A1
- Authority
- US
- United States
- Prior art keywords
- smelting furnace
- slag
- copper
- reactor
- white metal
- 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.)
- Abandoned
Links
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 4
- 238000003723 Smelting Methods 0.000 claims abstract description 46
- 239000002893 slag Substances 0.000 claims abstract description 46
- 239000010949 copper Substances 0.000 claims abstract description 45
- 229910052802 copper Inorganic materials 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 36
- 230000001590 oxidative effect Effects 0.000 claims abstract description 30
- 229910001361 White metal Inorganic materials 0.000 claims abstract description 27
- 239000010969 white metal Substances 0.000 claims abstract description 27
- 239000012141 concentrate Substances 0.000 claims abstract description 19
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 18
- 239000001301 oxygen Substances 0.000 claims abstract description 18
- 239000000725 suspension Substances 0.000 claims abstract description 12
- 230000004907 flux Effects 0.000 claims abstract description 4
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 12
- 239000000155 melt Substances 0.000 claims description 6
- 238000005422 blasting Methods 0.000 claims description 5
- 238000005188 flotation Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000012071 phase Substances 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 13
- 229910052742 iron Inorganic materials 0.000 description 12
- 229910052717 sulfur Inorganic materials 0.000 description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 239000000377 silicon dioxide Substances 0.000 description 6
- 239000011593 sulfur Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 229910052681 coesite Inorganic materials 0.000 description 3
- 229910052906 cristobalite Inorganic materials 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 229910052682 stishovite Inorganic materials 0.000 description 3
- 229910052905 tridymite Inorganic materials 0.000 description 3
- XOCUXOWLYLLJLV-UHFFFAOYSA-N [O].[S] Chemical compound [O].[S] XOCUXOWLYLLJLV-UHFFFAOYSA-N 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- OMZSGWSJDCOLKM-UHFFFAOYSA-N copper(II) sulfide Chemical compound [S-2].[Cu+2] OMZSGWSJDCOLKM-UHFFFAOYSA-N 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 235000013980 iron oxide Nutrition 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Images
Classifications
-
- 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
- C22B15/00—Obtaining copper
-
- 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
- C22B15/00—Obtaining copper
- C22B15/0026—Pyrometallurgy
- C22B15/0028—Smelting or converting
- C22B15/003—Bath smelting or converting
- C22B15/0045—Bath smelting or converting in muffles, crucibles, or closed vessels
-
- 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
- C22B15/00—Obtaining copper
- C22B15/0026—Pyrometallurgy
- C22B15/0028—Smelting or converting
- C22B15/0047—Smelting or converting flash smelting or converting
Definitions
- the invention relates to a method defined in claim 1 for producing blister copper.
- the primary function of slag is to collect in a fluid form that can be tapped all iron oxides and silicatic and oxidic ingredients of the gangue created in the smelting process.
- slag is cooled, crushed and flotated in order to recover the copper, or it is treated in reducing electric furnace processes.
- the matte phase which generally is further treated in converting, there is obtained 50-70 percentages of copper.
- the iron contained by the matte phase is oxidized when blasting oxygen in the melt and forms, together with the added silica sand, fajalite slag that in the initial step of the converting process floats in the reactor on the surface of the white metal that is rich in copper.
- the white metal contains 70-80 percentages of copper.
- blister copper the copper content whereof is of the order 99 percentages.
- the slag still contains 5-10 percentages of copper, which is recovered by flotation and by feeding the slag concentrate that is rich in copper back into the flash smelting furnace or by treating the slag in reducing conditions for example in an electric furnace.
- blister copper i.e. blister copper from sulfidic concentrate in one process step in a suspension reactor
- the biggest problem here is that in said process, there is created a lot of slag, and also a large amount of copper is collected in this slag.
- the treatment of slag in order to recover the copper contained therein causes extra expenses for the process.
- the copper content in the concentrate is sufficiently high, typically at least 37 percentages by weight, it is economically profitable to produce blister copper in one process step. If the concentrate contains only slight amounts of iron or other slag-forming components, in which case the amount of created slag is not so high, also the processing of a concentrate with a lower copper content is profitable.
- blister copper there is generally needed a two-step slag cleaning for the created slag in order to obtain a sufficiently high yield for the recovered copper.
- FIG. 1 (INSKO 261608 VII, page 9), there is illustrated a sulfur-oxygen potential diagram for a Cu—Fe—S—O—SiO 2 system at the temperature 1300° C.
- contents of various phases occurring in the copper smelting process in different conditions. From the figure it can be seen that when white metal is present, the copper content of the respective slag is lower than with a slag where the blister copper is in balance.
- the object of the present invention is to eliminate some of the drawbacks of the prior art. Another object of the invention is to prevent the creation of a slag with a high copper content in the production of blister copper.
- the invention is characterized by what is set forth in the preamble of claim 1 .
- Other embodiments of the invention are characterized by what is set forth in the other claims.
- the method according to the invention for producing blister copper has several advantages.
- concentrate, flux and oxygen-enriched air are together fed into a suspension smelting furnace, such as a flash smelting furnace, so that there are created at least two molten phases, a white metal phase and a slag phase, and the white metal is oxidized after the suspension smelting furnace at least in one oxidizing reactor.
- the operations in the suspension smelting furnace are advantageously carried out in conditions that provide for the creation of white metal, which means that the oxygen potential in the furnace is within the range 10 ⁇ 7 -10 ⁇ 6 and the sulfur dioxide partial pressure is within the range 0.2-1.
- White metal is essentially composed of copper (70-80%) and sulfur.
- the white metal created in the smelting does not substantially contain any slagging components.
- the white metal is tapped out of the furnace either in continuous operation or in batches, in order to be oxidized in an oxidizing reactor, where the sulfur contained in the white metal is oxidized by using oxygen-enriched air, so that there are created sulfur dioxide and blister copper, but hardly any slag.
- the oxidizing reactor is arranged in a stationary fashion in connection with the suspension smelting furnace.
- the oxidizing reactor is connected to the suspension smelting furnace by a closed melt launder that provides for the transferring of the melt.
- the oxidizing reactor is preferably a surface blasting reactor.
- the oxidizing reactor is an injection reactor, by which also white metal in a solid state can advantageously be melted by injecting it into the melt together with oxidizing gas.
- the employed oxidizing reactor is advantageously for example of the type Ausmelt, Isasmelt or Mitsubishi.
- Slag is tapped separately from the suspension smelting furnace and treated, according to a preferred embodiment of the invention, in an electric furnace in order to recover the copper content thereof.
- slag is after the suspension smelting furnace treated in flotation in order to recover the copper content.
- FIG. 1 A sulfur-oxygen potential diagram for a Cu—Fe—S—O—SiO 2 system at the temperature of 1300° C.
- FIG. 2 a A process diagram of the process according to the invention.
- FIG. 2 b A process diagram of a process according to another preferred embodiment of the invention.
- FIG. 2 a illustrates the method according to the invention.
- Now concentrate 5 , flux 6 and oxygen-enriched air 7 are together fed into a flash smelting furnace 1 , so that at the lower part 4 thereof there are created two molten phases, a white metal phase 11 and a slag phase 10 .
- White metal 11 is oxidized after the flash smelting furnace in one oxidizing reactor 12 , and there is created blister copper 15 .
- blister copper 15 In addition to white metal and slag, in the flash smelting furnace there is created a small amount of blister copper, which also is conducted into the oxidizing reactor in 12 .
- the process gases created in the flash smelting furnace 1 are conducted via the furnace uptake shaft 2 to a waste heat boiler 8 , where the created dusts 9 are recirculated back into the flash smelting furnace, and the gases 17 are conducted to further treatment.
- the white metal 11 is tapped out of the furnace 1 either in continuous operation or in batches into the oxidizing reactor 12 , where the sulfur contained in the white metal is oxidized by oxygen-enriched air 16 , so that there are created sulfur dioxide and blister copper 15 , but not slag.
- the oxidizing reactor 12 is arranged to be installed in connection with the flash smelting furnace in a stationary fashion. In another embodiment of the invention, illustrated in FIG.
- the oxidizing reactor 12 is connected by means of a melt launder 13 directly to the flash smelting furnace.
- the slag 10 created in the flash smelting furnace 1 is conducted into slag treatment 14 , alternatively either into an electric furnace or into flotation in order to recover the copper content of the slag.
- the oxidizing reactor is preferably a surface blasting or injection reactor, in which case also solid white metal can advantageously be melted by injecting it into the melt together with the oxidizing gas.
- the oxidizing reactor is preferably for example of the type Ausmelt, Isasmelt or Mitsubishi.
- the slag is treated in a slag enrichment plant, so that the rate of created slag is 8,844 kg/h (content 46% Cu, 25% Fe), and said slag is then fed back into the flash smelting furnace together with the concentrate.
- the created white metal is treated in an oxidizing reactor, into which there is fed technical oxygen at 4,328 Nm 3 /h and air at 18,979 Nm 3 /h. Now there is created blister copper at 49,274 kg/h (content 98% Cu, 0.04% Fe) and a small amount of slag (1 ton/h, content 50% Cu, 27% Fe). The slag is granulated and fed back into the flash smelting furnace.
- the total quantity of copper recirculated back into the flash smelting furnace in slag concentrate and in the slag from the oxidizing reactor is 4,575 kg Cu, which corresponds to about 9% of the whole copper quantity contained in the concentrate. If the concentrate were smelted directly into blister, the slag quantity would be about 130 t/h, and it would contain even more than 50% of the total copper quantity contained in the concentrate.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20021114 | 2002-06-11 | ||
| FI20021114A FI116069B (fi) | 2002-06-11 | 2002-06-11 | Menetelmä raakakuparin valmistamiseksi |
| PCT/FI2003/000432 WO2003104504A1 (en) | 2002-06-11 | 2003-06-02 | Method for producing blister copper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US20050199095A1 true US20050199095A1 (en) | 2005-09-15 |
Family
ID=8564117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US10/517,506 Abandoned US20050199095A1 (en) | 2002-06-11 | 2003-06-02 | Method for producing blister copper |
Country Status (16)
| Country | Link |
|---|---|
| US (1) | US20050199095A1 (es) |
| EP (1) | EP1511868A1 (es) |
| JP (1) | JP2005536629A (es) |
| KR (1) | KR20050007600A (es) |
| CN (1) | CN100385024C (es) |
| AR (1) | AR040256A1 (es) |
| AU (1) | AU2003232264A1 (es) |
| BR (1) | BR0311758A (es) |
| CA (1) | CA2488398A1 (es) |
| EA (1) | EA007445B1 (es) |
| FI (1) | FI116069B (es) |
| MX (1) | MXPA04012084A (es) |
| PE (1) | PE20040137A1 (es) |
| PL (1) | PL372533A1 (es) |
| RS (1) | RS107704A (es) |
| WO (1) | WO2003104504A1 (es) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090226284A1 (en) * | 2004-01-15 | 2009-09-10 | Ilkka Kojo | Supply system for suspension smelting furnace |
| US20090293678A1 (en) * | 2008-06-02 | 2009-12-03 | Tatsuya Motomura | Copper smelting method |
| CN102605191A (zh) * | 2012-04-16 | 2012-07-25 | 阳谷祥光铜业有限公司 | 一种铜精矿直接生产粗铜的方法 |
| US9725784B2 (en) | 2012-06-21 | 2017-08-08 | Lawrence F. McHugh | Production of copper via looping oxidation process |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005008684B4 (de) * | 2004-03-05 | 2008-10-09 | Merck Patent Gmbh | Verwendung von Flüssigkristall-Displays sowie Verfahren zu deren Verwertung |
| CA2565643C (en) * | 2006-06-28 | 2011-08-02 | Nippon Mining & Metals Co., Ltd. | Operation method of copper smelting |
| FI120157B (fi) * | 2007-12-17 | 2009-07-15 | Outotec Oyj | Menetelmä kuparirikasteen jalostamiseksi |
| CN102876902A (zh) * | 2012-10-18 | 2013-01-16 | 铜陵有色金属集团股份有限公司金冠铜业分公司 | 一种铜精矿闪速-熔池复合熔炼方法及奥托昆普闪速炉 |
| FI125793B (en) | 2014-05-14 | 2016-02-15 | Outotec Finland Oy | A method for converting copper-containing material |
| JP6466869B2 (ja) * | 2016-02-29 | 2019-02-06 | パンパシフィック・カッパー株式会社 | 銅製錬炉の操業方法 |
| BE1025772B1 (nl) * | 2017-12-14 | 2019-07-08 | Metallo Belgium | Verbetering in koper-/tin-/loodproductie |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3980470A (en) * | 1974-03-30 | 1976-09-14 | National Research Institute For Metals | Method of spray smelting copper |
| US4030915A (en) * | 1974-11-11 | 1977-06-21 | Outokumpu Oy | Process for producing raw copper continuously in one stage from unrefined sulfidic copper concentrate or ore |
| US4349383A (en) * | 1979-10-11 | 1982-09-14 | Klockner-Humboldt-Deutz Ag | Method for the pyrometallurgical production of copper |
| US4416690A (en) * | 1981-06-01 | 1983-11-22 | Kennecott Corporation | Solid matte-oxygen converting process |
| US4470845A (en) * | 1983-01-05 | 1984-09-11 | Newmont Mining Corporation | Continuous process for copper smelting and converting in a single furnace by oxygen injection |
| US4528033A (en) * | 1983-06-15 | 1985-07-09 | Outokumpu Oy | Method for producing blister copper |
| US5007959A (en) * | 1988-04-29 | 1991-04-16 | Noranda Inc. | Process for converting of solid high-grade copper matte |
| US5194213A (en) * | 1991-07-29 | 1993-03-16 | Inco Limited | Copper smelting system |
| US6761749B1 (en) * | 2000-01-04 | 2004-07-13 | Outokumpu Oyj | Method for the production of blister copper in suspension reactor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1067113C (zh) * | 1998-08-08 | 2001-06-13 | 徐有生 | 铜、镍硫化矿无污染火冶法 |
-
2002
- 2002-06-11 FI FI20021114A patent/FI116069B/fi active IP Right Grant
-
2003
- 2003-06-02 CA CA002488398A patent/CA2488398A1/en not_active Abandoned
- 2003-06-02 CN CNB038135205A patent/CN100385024C/zh not_active Expired - Fee Related
- 2003-06-02 PE PE2003000540A patent/PE20040137A1/es not_active Application Discontinuation
- 2003-06-02 KR KR10-2004-7020015A patent/KR20050007600A/ko not_active Withdrawn
- 2003-06-02 AU AU2003232264A patent/AU2003232264A1/en not_active Abandoned
- 2003-06-02 WO PCT/FI2003/000432 patent/WO2003104504A1/en not_active Ceased
- 2003-06-02 RS YUP-1077/04A patent/RS107704A/sr unknown
- 2003-06-02 PL PL03372533A patent/PL372533A1/xx not_active Application Discontinuation
- 2003-06-02 BR BR0311758-8A patent/BR0311758A/pt not_active IP Right Cessation
- 2003-06-02 EA EA200401402A patent/EA007445B1/ru unknown
- 2003-06-02 EP EP03757080A patent/EP1511868A1/en not_active Withdrawn
- 2003-06-02 MX MXPA04012084A patent/MXPA04012084A/es unknown
- 2003-06-02 JP JP2004511562A patent/JP2005536629A/ja not_active Abandoned
- 2003-06-02 US US10/517,506 patent/US20050199095A1/en not_active Abandoned
- 2003-06-10 AR ARP030102064A patent/AR040256A1/es not_active Application Discontinuation
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3980470A (en) * | 1974-03-30 | 1976-09-14 | National Research Institute For Metals | Method of spray smelting copper |
| US4030915A (en) * | 1974-11-11 | 1977-06-21 | Outokumpu Oy | Process for producing raw copper continuously in one stage from unrefined sulfidic copper concentrate or ore |
| US4349383A (en) * | 1979-10-11 | 1982-09-14 | Klockner-Humboldt-Deutz Ag | Method for the pyrometallurgical production of copper |
| US4416690A (en) * | 1981-06-01 | 1983-11-22 | Kennecott Corporation | Solid matte-oxygen converting process |
| US4470845A (en) * | 1983-01-05 | 1984-09-11 | Newmont Mining Corporation | Continuous process for copper smelting and converting in a single furnace by oxygen injection |
| US4528033A (en) * | 1983-06-15 | 1985-07-09 | Outokumpu Oy | Method for producing blister copper |
| US5007959A (en) * | 1988-04-29 | 1991-04-16 | Noranda Inc. | Process for converting of solid high-grade copper matte |
| US5194213A (en) * | 1991-07-29 | 1993-03-16 | Inco Limited | Copper smelting system |
| US6761749B1 (en) * | 2000-01-04 | 2004-07-13 | Outokumpu Oyj | Method for the production of blister copper in suspension reactor |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090226284A1 (en) * | 2004-01-15 | 2009-09-10 | Ilkka Kojo | Supply system for suspension smelting furnace |
| US8956564B2 (en) * | 2004-01-15 | 2015-02-17 | Outotec Oyj | Supply system for suspension smelting furnace |
| US20090293678A1 (en) * | 2008-06-02 | 2009-12-03 | Tatsuya Motomura | Copper smelting method |
| US8382879B2 (en) | 2008-06-02 | 2013-02-26 | Pan Pacific Copper Co., Ltd. | Copper smelting method |
| CN102605191A (zh) * | 2012-04-16 | 2012-07-25 | 阳谷祥光铜业有限公司 | 一种铜精矿直接生产粗铜的方法 |
| US8771396B2 (en) | 2012-04-16 | 2014-07-08 | Xiangguang Copper Co., Ltd. | Method for producing blister copper directly from copper concentrate |
| US9725784B2 (en) | 2012-06-21 | 2017-08-08 | Lawrence F. McHugh | Production of copper via looping oxidation process |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2003104504A1 (en) | 2003-12-18 |
| AR040256A1 (es) | 2005-03-23 |
| EA200401402A1 (ru) | 2005-06-30 |
| CN1659293A (zh) | 2005-08-24 |
| RS107704A (sr) | 2007-04-10 |
| KR20050007600A (ko) | 2005-01-19 |
| BR0311758A (pt) | 2005-03-08 |
| FI20021114A0 (fi) | 2002-06-11 |
| CN100385024C (zh) | 2008-04-30 |
| PL372533A1 (pl) | 2005-07-25 |
| EA007445B1 (ru) | 2006-10-27 |
| FI116069B (fi) | 2005-09-15 |
| PE20040137A1 (es) | 2004-05-05 |
| EP1511868A1 (en) | 2005-03-09 |
| CA2488398A1 (en) | 2003-12-18 |
| AU2003232264A1 (en) | 2003-12-22 |
| JP2005536629A (ja) | 2005-12-02 |
| MXPA04012084A (es) | 2005-03-07 |
| FI20021114L (fi) | 2003-12-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: OYJ, OUTOKUMPU, FINLAND Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HANNIALA, PEKKA;KOJO, ILKKA;REEL/FRAME:016629/0959 Effective date: 20041029 |
|
| AS | Assignment |
Owner name: OUTOKUMPU TECHNOLOGY OY, FINLAND Free format text: CHANGE OF NAME;ASSIGNOR:OUTOKUMPU OYJ;REEL/FRAME:016775/0102 Effective date: 20051031 |
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| STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |