EP0622467A1 - Process for roasting refractory gold ores - Google Patents
Process for roasting refractory gold ores Download PDFInfo
- Publication number
- EP0622467A1 EP0622467A1 EP94200826A EP94200826A EP0622467A1 EP 0622467 A1 EP0622467 A1 EP 0622467A1 EP 94200826 A EP94200826 A EP 94200826A EP 94200826 A EP94200826 A EP 94200826A EP 0622467 A1 EP0622467 A1 EP 0622467A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fluidized bed
- roasting
- methanol
- added
- refractory gold
- 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- Withdrawn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
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 239000010931 gold Substances 0.000 title claims abstract description 19
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims description 10
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000000446 fuel Substances 0.000 claims abstract description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Natural products C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 3
- 239000007787 solid Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000002386 leaching Methods 0.000 description 3
- 239000001294 propane Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 239000001273 butane Substances 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 2
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 2
- 229910052683 pyrite Inorganic materials 0.000 description 2
- 239000011028 pyrite Substances 0.000 description 2
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- MJLGNAGLHAQFHV-UHFFFAOYSA-N arsenopyrite Chemical compound [S-2].[Fe+3].[As-] MJLGNAGLHAQFHV-UHFFFAOYSA-N 0.000 description 1
- 229910052964 arsenopyrite Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000002816 fuel additive Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- MNWBNISUBARLIT-UHFFFAOYSA-N sodium cyanide Chemical compound [Na+].N#[C-] MNWBNISUBARLIT-UHFFFAOYSA-N 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
- C22B1/10—Roasting processes in fluidised form
-
- 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
- C22B11/00—Obtaining noble metals
- C22B11/02—Obtaining noble metals by dry processes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S423/00—Chemistry of inorganic compounds
- Y10S423/09—Reaction techniques
- Y10S423/16—Fluidization
Definitions
- the invention relates to a method for roasting refractory gold ores in an oxidizing atmosphere in a fluidized bed with the addition of carbon-containing fuels.
- Refractory gold ores or concentrates are those that cannot be leached directly with NaCN and have arsenopyrites or pyrites with more or less organic carbon as gold carriers. They have a relatively low gold content. For such ores, the most complete possible oxidation of the sulfur and carbon content is required before the cyanide leaching. This oxidation takes place by roasting with oxygen-containing gases. In the case of many refractory gold ores, the arsenopyrite, pyrite and organic carbon content is insufficient to generate the required heat of reaction and fuel must be added. A large number of refractory gold ores must be roasted at a relatively low temperature in order to achieve good gold yield during the subsequent leaching.
- the invention has for its object to use a fuel which is largely burned to CO2 and H2O in the fluidized bed and which requires the least possible effort.
- methanol as a carbon-containing fuel surprisingly leads to extensive combustion to CO2 and H2O in the fluidized bed. It is likely that the refractory gold ores have a catalytic effect on the combustion of the methanol.
- the methanol can be added to the fluidized bed in a simple manner.
- a preferred embodiment is that the roasting takes place at temperatures of 540-580 ° C. At these temperatures, particularly good leaching properties of the roasted product are achieved.
- a preferred embodiment is that the methanol is added to the fluidized bed in liquid form.
- the addition in liquid form results in higher conversions to CO2 and H2 O.
- a preferred embodiment is that the roasting takes place in a circulating fluidized bed.
- the system of the circulating fluidized bed consists of the fluidized bed reactor, the return cyclone and the return line.
- This fluidized bed principle is characterized in that, in contrast to the "classic" fluidized bed, in which a dense phase is separated from the gas space above by a clear density jump, there are distribution states without a defined boundary layer. There is no leap in density between the dense phase and the dust space above it, but the solids concentration within the reactor decreases continuously from bottom to top. A gas-solid suspension is discharged from the upper part of the reactor.
- a preferred embodiment is that the grain size of the gold ore is less than 1 mm. This grain size gives good results.
- a preferred embodiment is that 60-80% of the gold ore have a grain size below 75 microns. This grain size gives particularly good results.
- a refractory gold ore with a gold content of 8 g / t and 2.5% sulfide sulfur is used, which is present as pyrite.
- the pilot plant is a circulating fluidized bed system, mainly consisting of the fluidized bed reactor, a recycle cyclone, which is connected directly to the gas outlet at the top of the reactor and a recycle line.
- the solid separated in the cyclone is returned to the reactor via the return line.
- 35 Nm3 / h carrier gas consisting of a mixture of O2 and N2 with 13 vol.% O2, at a temperature of 500 ° C and a pressure of 1.1 bar are introduced into the wind box of the fluidized bed reactor.
- the carrier gas flows through the openings of the inflow floor at a speed of 60 m / sec.
- the temperature in the reactor is 560 ° C.
- 0.75 kg / h of methanol are added to the reactor above the inflow floor.
- the roasting gas has a content of 2% SO2, 1.25% CO2, 0.25% CO and 8% O2.
- the roast has a sulfide sulfur content of ⁇ 0.1%. A gold yield of 90% is achieved during further processing.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Rösten refraktärer Golderze in oxidierender Atmosphäre in einer Wirbelschicht unter Zusatz von kohlenstoffhaltigen Brennstoffen.The invention relates to a method for roasting refractory gold ores in an oxidizing atmosphere in a fluidized bed with the addition of carbon-containing fuels.
Refraktäre Golderze oder Konzentrate sind solche Erze, die sich nicht direkt mit NaCN laugen lassen und als Goldträger Arsenopyrite oder Pyrite mit mehr oder weniger organischem Kohlenstoff haben. Sie haben einen relativ niedrigen Goldgehalt. Für solche Erze ist vor der Cyanidlaugung eine möglichst vollständige Oxidation des Schwefel- und Kohlenstoffgehaltes erforderlich. Diese Oxidation erfolgt durch Röstung mit sauerstoffhaltigen Gasen. Bei vielen refraktären Golderzen reicht der vorhandene Gehalt an Arsenopyrit, Pyrit und organischem Kohlenstoff nicht zur Erzeugung der erforderlichen Reaktionswärme aus und es muß Brennstoff zugesetzt werden. Eine Vielzahl von refraktären Golderzen muß bei relativ niedriger Temperatur geröstet werden, damit ein gutes Goldausbringen bei der anschließenden Laugung erzielt wird.Refractory gold ores or concentrates are those that cannot be leached directly with NaCN and have arsenopyrites or pyrites with more or less organic carbon as gold carriers. They have a relatively low gold content. For such ores, the most complete possible oxidation of the sulfur and carbon content is required before the cyanide leaching. This oxidation takes place by roasting with oxygen-containing gases. In the case of many refractory gold ores, the arsenopyrite, pyrite and organic carbon content is insufficient to generate the required heat of reaction and fuel must be added. A large number of refractory gold ores must be roasted at a relatively low temperature in order to achieve good gold yield during the subsequent leaching.
Aus der EP-A-508 542 ist es bekannt, daß Golderze bei einer Temperatur von 475-600°C und insbesondere bei 500-575°C geröstet werden sollen. Als Brennstoffzusatz werden Kohle, Butan oder Propan genannt. Der Zündpunkt soll dem des Propans entsprechen oder niedriger liegen. Propan und Butan werden jedoch nur zu einem unbefriedigenden Teil zu CO₂ und H₂O verbrannt. Kohle muß auf die für die Wirbelschicht erforderliche Korngröße zerkleinert werden.From EP-A-508 542 it is known that gold ores are to be roasted at a temperature of 475-600 ° C and in particular at 500-575 ° C. Coal, butane or propane are mentioned as fuel additives. The ignition point should correspond to or lower than that of the propane. However, propane and butane are only burned to an unsatisfactory extent to CO₂ and H₂O. Coal must be crushed to the grain size required for the fluidized bed.
Der Erfindung liegt die Aufgabe zugrunde, einen Brennstoff einzusetzen, der weitgehend zu CO₂ und H₂O in der Wirbelschicht verbrannt wird und der einen möglichst geringen Aufwand erfordert.The invention has for its object to use a fuel which is largely burned to CO₂ and H₂O in the fluidized bed and which requires the least possible effort.
Die Lösung dieser Aufgbe erfolgt erfindungsgemäß bei dem eingangs genannten Verfahren dadurch, daß als kohlenstoffhaltiger Brennstoff Methanol (CH₃OH) in die Wirbelschicht zugegeben wird und die Röstung bei Temperaturen von 500-650°C erfolgt. Die Menge des zugesetzten Methanols richtet sich nach den jeweiligen Verfahrensbedingungen. Die Röstung kann in einer klassischen Wirbelschicht oder in einer zirkulierenden Wirbelschicht erfolgen.These tasks are solved according to the invention in the process mentioned at the outset by adding methanol (CH₃OH) as the carbon-containing fuel to the fluidized bed and roasting at temperatures of 500-650 ° C. The amount of methanol added depends on the respective process conditions. Roasting can take place in a classic fluidized bed or in a circulating fluidized bed.
Der Einsatz von Methanol als kohlenstoffhaltiger Brennstoff führt überraschend zu einer weitgehenden Verbrennung zu CO₂ und H₂O in der Wirbelschicht. Wahrscheinlich wirken gerade die refraktären Golderze katalytisch auf die Verbrennung des Methanols. Das Methanol kann in einfacher Weise in die Wirbelschicht zugegeben werden.The use of methanol as a carbon-containing fuel surprisingly leads to extensive combustion to CO₂ and H₂O in the fluidized bed. It is likely that the refractory gold ores have a catalytic effect on the combustion of the methanol. The methanol can be added to the fluidized bed in a simple manner.
Eine vorzugsweise Ausgestaltung besteht darin, daß die Röstung bei Temperaturen von 540-580°C erfolgt. Bei diesen Temperaturen werden besonders gute Laugungseigenschaften des Röstgutes erzielt.A preferred embodiment is that the roasting takes place at temperatures of 540-580 ° C. At these temperatures, particularly good leaching properties of the roasted product are achieved.
Eine vorzugsweise Ausgestaltung besteht darin, daß das Methanol in flüssiger Form in die Wirbelschicht zugegeben wird. Die Zugabe in flüssiger Form ergibt höhere Umsetzungen zu CO₂ und H₂O. A preferred embodiment is that the methanol is added to the fluidized bed in liquid form. The addition in liquid form results in higher conversions to CO₂ and H₂ O.
Eine vorzugsweise Ausgestaltung besteht darin, daß die Röstung in einer zirkulierenden Wirbelschicht erfolgt. Das System der zirkulierenden Wirbelschicht besteht aus dem Wirbelschichtreaktor, dem Rückführzyklon und der Rückführleitung. Dieses Wirbelschichtprinzip zeichnet sich dadurch aus, daß im Unterschied zur "klassischen" Wirbelschicht, bei der eine dichte Phase durch einen deutlichen Dichtesprung von dem darüber befindlichen Gasraum getrennt ist, Verteilungszustände ohne definierte Grenzschicht vorliegen. Ein Dichtesprung zwischen dichter Phase und darüber befindlichem Staubraum ist nicht vorhanden, jedoch nimmt innerhalb des Reaktors die Feststoffkonzentration von unten nach oben ständig ab. Aus dem oberen Teil des Reaktors wird eine Gas-Feststoff-Suspension ausgetragen. Bei der Definition der Betriebsbedingungen über die Kennzahlen von Froude und Archimedes ergeben sich die Bereiche:
bzw.
0,01 ≦ Ar ≦ 100 ,
wobei
sind.A preferred embodiment is that the roasting takes place in a circulating fluidized bed. The system of the circulating fluidized bed consists of the fluidized bed reactor, the return cyclone and the return line. This fluidized bed principle is characterized in that, in contrast to the "classic" fluidized bed, in which a dense phase is separated from the gas space above by a clear density jump, there are distribution states without a defined boundary layer. There is no leap in density between the dense phase and the dust space above it, but the solids concentration within the reactor decreases continuously from bottom to top. A gas-solid suspension is discharged from the upper part of the reactor. When defining the operating conditions using the key figures from Froude and Archimedes, the following areas result:
respectively.
0.01 ≦ Ar ≦ 100,
in which
are.
Es bedeuten:
- u
- die relative Gasgeschwindigkeit in m/sec.
- Ar
- die Archimedes-Zahl
- Fr
- die Froude-Zahl
- ρg
- die Dichte des Gases in kg/m³
- ρk
- die Dichte des Feststoffteilchens in kg/m³
- dk
- den Durchmesser des kugelförmigen Teilchens in m
- ν
- die kinematische Zähigkeit in m²/sec.
- g
- die Gravitationskonstante in m/sec.²
- u
- the relative gas velocity in m / sec.
- Ar
- the Archimedes number
- Fr
- the Froude number
- ρg
- the density of the gas in kg / m³
- ρk
- the density of the solid particle in kg / m³
- d k
- the diameter of the spherical particle in m
- ν
- the kinematic toughness in m² / sec.
- G
- the gravitational constant in m / sec.²
In einer zirkulierenden Wirbelschicht werden besonders gute Ergebnisse im Hinblick auf einen weitgehenden Umsatz des Methanols zu CO₂ und H₂O und gute Laugbarkeit des Erzes erzielt.In a circulating fluidized bed, particularly good results are achieved with regard to extensive conversion of the methanol to CO₂ and H₂O and good leachability of the ore.
Eine vorzugsweise Ausgestaltung besteht darin, daß die Korngröße des Golderzes unter 1 mm liegt. Diese Korngröße ergibt gute Ergebnisse.A preferred embodiment is that the grain size of the gold ore is less than 1 mm. This grain size gives good results.
Eine vorzugsweise Ausgestaltung besteht darin, daß 60-80% des Golderzes eine Korngröße unter 75 µm haben. Diese Korngröße ergibt besonders gute Ergebnisse.A preferred embodiment is that 60-80% of the gold ore have a grain size below 75 microns. This grain size gives particularly good results.
Es wird ein refraktäres Golderz mit einem Goldgehalt von 8 g/t und 2,5 % Sulfidschwefel eingesetzt, der als Pyrit vorliegt. Die Korngröße beträgt d₅₀ = 30 µm und 100 % < 200 µm.A refractory gold ore with a gold content of 8 g / t and 2.5% sulfide sulfur is used, which is present as pyrite. The grain size is d₅₀ = 30 µm and 100% <200 µm.
Die Pilotanlage ist eine zirkulierende Wirbelschichtanlage, hauptsächlich bestehend aus dem Wirbelschichtreaktor, einem Rückführzyklon, der direkt an den Gasaustritt am Oberteil des Reaktors angeschlossen ist und einer Rückführleitung. Der im Zyklon abgeschiedene Feststoff wird über die Rückführleitung in den Reaktor zurückgeführt.The pilot plant is a circulating fluidized bed system, mainly consisting of the fluidized bed reactor, a recycle cyclone, which is connected directly to the gas outlet at the top of the reactor and a recycle line. The solid separated in the cyclone is returned to the reactor via the return line.
Es werden 40 kg/h Erz über ein Falleitung in den Wirbelschichtreaktor aufgegeben.40 kg / h ore are fed into the fluidized bed reactor via a downpipe.
In den Windkasten des Wirbelschichtreaktors werden 35 Nm³/h Trägergas, bestehend aus einer Mischung aus O₂ und N₂ mit 13 Vol. % O₂, mit einer Temperatur von 500°C und einem Druck von 1,1 bar eingeleitet. Das Trägergas strömt mit einer Geschwindigkeit von 60 m/sek durch die Öffnungen des Anströmbodens. Die Temperatur im Reaktor beträgt 560°C. Als Zusatzbrennstoff werden 0,75 kg/h Methanol in den Reaktor oberhalb des Anströmbodens zugegeben. Das Röstgas hat einen Gehalt von 2 % SO₂, 1,25 % CO₂, 0,25 % CO und 8 % O₂. Das Röstgut hat einen Sulfidschwefelgehalt von <0,1 %. Bei der Weiterverarbeitung wird eine Goldausbeute von 90 % erzielt.35 Nm³ / h carrier gas, consisting of a mixture of O₂ and N₂ with 13 vol.% O₂, at a temperature of 500 ° C and a pressure of 1.1 bar are introduced into the wind box of the fluidized bed reactor. The carrier gas flows through the openings of the inflow floor at a speed of 60 m / sec. The temperature in the reactor is 560 ° C. As additional fuel, 0.75 kg / h of methanol are added to the reactor above the inflow floor. The roasting gas has a content of 2% SO₂, 1.25% CO₂, 0.25% CO and 8% O₂. The roast has a sulfide sulfur content of <0.1%. A gold yield of 90% is achieved during further processing.
Claims (6)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4314231A DE4314231A1 (en) | 1993-04-30 | 1993-04-30 | Process for roasting refractory gold ores |
| DE4314231 | 1993-04-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0622467A1 true EP0622467A1 (en) | 1994-11-02 |
Family
ID=6486803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94200826A Withdrawn EP0622467A1 (en) | 1993-04-30 | 1994-03-29 | Process for roasting refractory gold ores |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5425799A (en) |
| EP (1) | EP0622467A1 (en) |
| AU (1) | AU669430B2 (en) |
| CA (1) | CA2121542A1 (en) |
| DE (1) | DE4314231A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997021842A1 (en) * | 1995-12-13 | 1997-06-19 | Metallgesellschaft Aktiengesellschaft | Process for thermal treatment of refractory gold ores |
| CN101942559A (en) * | 2010-09-09 | 2011-01-12 | 长春黄金研究院 | Gold extracting process through low-temperature roasting |
| WO2018162043A1 (en) * | 2017-03-07 | 2018-09-13 | Outotec (Finland) Oy | Process and apparatus for roasting of gold bearing sulfide concentrate |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6248301B1 (en) * | 1991-04-12 | 2001-06-19 | Newmont Mining Corporation And Newmont Gold Company | Process for treating ore having recoverable metal values including arsenic containing components |
| AUPP208498A0 (en) * | 1998-03-02 | 1998-03-26 | Arton (No 001) Pty Ltd | Gold recovery process |
| CN100457929C (en) * | 2006-10-11 | 2009-02-04 | 云南省地质科学研究所 | Integral gold refining kiln oxidizing roasting process for refractory gold ore |
| CN111500852B (en) * | 2020-05-29 | 2021-08-10 | 东北大学 | Carbon-containing gold ore suspension roasting system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52142616A (en) * | 1976-05-24 | 1977-11-28 | Sumitomo Heavy Ind Ltd | Direct reduction of iron ore or pellets |
| DE3021994A1 (en) * | 1980-06-12 | 1981-12-24 | Krupp-Koppers Gmbh, 4300 Essen | Crude iron mfr. in blast furnace - where suspension of coal dust in methanol is fed into tuyeres to replace coke or petroleum prods. |
| GB2132230A (en) * | 1982-12-20 | 1984-07-04 | Procedyne Corp | Method and apparatus for metal treatment |
| EP0508542A2 (en) * | 1991-04-12 | 1992-10-14 | METALLGESELLSCHAFT Aktiengesellschaft | Process for treating ore having recoverable metal values including arsenic containing components |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2624302C2 (en) * | 1976-05-31 | 1987-04-23 | Metallgesellschaft Ag, 6000 Frankfurt | Methods for carrying out exothermic processes |
| SE8303184L (en) * | 1983-06-06 | 1984-12-07 | Boliden Ab | PROCEDURE FOR THE PREPARATION OF COPPER MELT MATERIALS AND SIMILAR MATERIALS CONTAINING HIGH CONTAINERS ARSENIK AND / OR ANTIMON |
| US5123956A (en) * | 1991-04-12 | 1992-06-23 | Newmont Mining Corporation | Process for treating ore having recoverable gold values and including arsenic-, carbon- and sulfur-containing components by roasting in an oxygen-enriched gaseous atmosphere |
| DE4122895C1 (en) * | 1991-07-11 | 1992-12-03 | Metallgesellschaft Ag, 6000 Frankfurt, De | |
| ZA926237B (en) * | 1991-09-25 | 1993-03-03 | Bhp Utah Int Inc | Sulfide roasting with lime. |
| US5380504A (en) * | 1993-04-23 | 1995-01-10 | Fuller Company | Treatment of gold bearing ore |
| DE4329417C1 (en) * | 1993-09-01 | 1994-08-18 | Metallgesellschaft Ag | Process for roasting refractory gold ores |
-
1993
- 1993-04-30 DE DE4314231A patent/DE4314231A1/en not_active Withdrawn
-
1994
- 1994-03-29 EP EP94200826A patent/EP0622467A1/en not_active Withdrawn
- 1994-04-18 CA CA002121542A patent/CA2121542A1/en not_active Abandoned
- 1994-04-28 AU AU60779/94A patent/AU669430B2/en not_active Ceased
- 1994-05-02 US US08/237,358 patent/US5425799A/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52142616A (en) * | 1976-05-24 | 1977-11-28 | Sumitomo Heavy Ind Ltd | Direct reduction of iron ore or pellets |
| DE3021994A1 (en) * | 1980-06-12 | 1981-12-24 | Krupp-Koppers Gmbh, 4300 Essen | Crude iron mfr. in blast furnace - where suspension of coal dust in methanol is fed into tuyeres to replace coke or petroleum prods. |
| GB2132230A (en) * | 1982-12-20 | 1984-07-04 | Procedyne Corp | Method and apparatus for metal treatment |
| EP0508542A2 (en) * | 1991-04-12 | 1992-10-14 | METALLGESELLSCHAFT Aktiengesellschaft | Process for treating ore having recoverable metal values including arsenic containing components |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 2, no. 38 (C - 6) 14 March 1978 (1978-03-14) * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997021842A1 (en) * | 1995-12-13 | 1997-06-19 | Metallgesellschaft Aktiengesellschaft | Process for thermal treatment of refractory gold ores |
| CN101942559A (en) * | 2010-09-09 | 2011-01-12 | 长春黄金研究院 | Gold extracting process through low-temperature roasting |
| WO2012031379A1 (en) * | 2010-09-09 | 2012-03-15 | 长春黄金研究院 | Method for extracting gold through low-temperature roasting |
| WO2018162043A1 (en) * | 2017-03-07 | 2018-09-13 | Outotec (Finland) Oy | Process and apparatus for roasting of gold bearing sulfide concentrate |
| EA038634B1 (en) * | 2017-03-07 | 2021-09-27 | Оутотек (Финлэнд) Ой | Process and apparatus for roasting of gold bearing sulfide concentrate |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2121542A1 (en) | 1994-10-31 |
| US5425799A (en) | 1995-06-20 |
| AU669430B2 (en) | 1996-06-06 |
| DE4314231A1 (en) | 1994-11-03 |
| AU6077994A (en) | 1994-11-03 |
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