EP0641864B1 - Process for roasting refractory gold ores - Google Patents
Process for roasting refractory gold ores Download PDFInfo
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- EP0641864B1 EP0641864B1 EP94202265A EP94202265A EP0641864B1 EP 0641864 B1 EP0641864 B1 EP 0641864B1 EP 94202265 A EP94202265 A EP 94202265A EP 94202265 A EP94202265 A EP 94202265A EP 0641864 B1 EP0641864 B1 EP 0641864B1
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- Prior art keywords
- roasting
- fuel
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- sulfur
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- 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
- C22B1/06—Sulfating roasting
-
- 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
Definitions
- the invention relates to a method for refractory roasting Gold ores in an oxidizing atmosphere in a fluidized bed below Addition of fuels and with the addition of oxygenated Gas.
- Refractory gold ores are those ores that are not directly related Let NaCN leach and arsenopyrites or pyrites as gold carriers contain with more or less organic carbon. she have a relatively low gold content. For such ores Before the cyanide leaching, the oxidation of the Sulfur and carbon content required. This oxidation is done by roasting with oxygen-containing gases. With many The existing content is sufficient for refractory gold ores Arsenopyrite, pyrite and organic carbon are not used Generation of the required reaction from, and it must Fuel can be added. A variety of refractory Gold ores must be roasted at a relatively low temperature, thus good gold yield during the subsequent leaching is achieved.
- Gold ores require gentle roasting to prevent heating on the Avoid particle surface.
- the gold yield is u. a. strongly dependent on the roasting temperature.
- the roasting temperature must below the sintering temperature of the components of the ore.
- the invention has for its object to use a fuel that ignites reliably at low temperatures and when it is burned, no or low levels of CO, H 2 and hydrocarbons are present in the exhaust gas.
- the object is achieved according to the invention in the process mentioned at the outset, and the roasting takes place at temperatures of 500 to 550 ° C. by adding elemental sulfur to the fluidized bed as fuel.
- the advantage of the process according to the invention is that CO, H 2 and hydrocarbons are not formed during the combustion of sulfur.
- Sulfur shows a surprisingly reliable readiness to ignite at low roasting temperatures and burns in the temperature range from 200 to 300 ° C.
- the addition of sulfur can be done by previous Mix with the gold ore or directly into the fluidized bed respectively.
- the refractory gold ores are roasted in one classic or in a circulating fluidized bed.
- the Oxygenated gases are used as the fluidizing gas below the bottom of the nozzle into the fluidized bed. Is too provided that oxygen-containing gases are also used as primary and secondary gas are introduced laterally into the fluidized bed reactor can be.
- the oxygen-containing gases are air or oxygen-enriched air.
- a preferred embodiment of the invention consists in that in addition to the sulfur, at least one additional fuel selected from hydrocarbons with a number of carbon atoms of 1 to 16, alcohols with a number of carbon atoms from 1 to 6 and an number of OH groups of 1 to as the fuel 2, organic ethers with a C atom number of 2 to 8 and an O atom number of 1, CS 2 or H 2 S is added to the fluidized bed.
- the ignition temperature of these fuels is reduced if the ignition temperature of these additional fuels is higher than the ignition temperature of the sulfur. This means that they ignite faster and burn more easily in such a mixture. If the ignition temperature of one of these additional fuels is lower than the ignition temperature of sulfur, the ignition temperature in a mixture with such an additional fuel is reduced.
- the concentration of the additional fuels must be higher than the concentration for the lower ignition limit of these fuels.
- the lower ignition limit of a fuel means the minimum concentration with which a fuel must be present in the gas mixture so that the fuel is still ignited.
- the additional fuels are added above their ignition limit if the heat content in the reactor is not sufficient to achieve the required roasting temperature.
- the heat content in the reactor is given by the amounts of carbon and sulfur present in refractory gold ores and by the amount of sulfur added as fuel.
- the roasting temperature can thus be controlled by metering the additional fuels.
- the additional fuels are added in amounts such that the roasting temperature does not exceed 550 ° C.
- the exhaust gas from the fluidized bed has an H 2 content of ⁇ 10 vppm, preferably ⁇ 5 vppm, a CO content of ⁇ 0.1 vol. %, preferably ⁇ 100 vppm, and a hydrocarbon content of ⁇ 100 vppm, preferably ⁇ 50 vppm.
- Hydrocarbon mixtures which as distillation fractions, such as. B. kerosene etc. or Refinery waste products are used. Next Hydrocarbon mixtures are used as additional fuels also alcohol mixtures that are used in the distillation of ethanol Waste products are used.
- a preferred embodiment of the invention is that 60 to 80% of the gold ore have a grain size below 75 microns. This grain size gives particularly good results.
- the term "grain size” stands for the mean grain diameter d 50 .
- a preferred embodiment of the invention is that the O 2 content in the gas which is introduced into the fluidized bed is 20 to 50% by volume.
- the oxygen-enriched air results in a better ignition of the fuel mixture.
- the use of oxygen-enriched air is particularly economical.
- the advantage of using the additional fuels is that they largely burn at low temperature, the proportions of CO, H 2 and hydrocarbons in the exhaust gas are very low and therefore do not need to be removed from the exhaust gas by post-combustion. In a subsequent sulfuric acid production, it is favorable that the proportions of CO, H 2 and hydrocarbons are very low, since these substances act as a catalyst in the oxidation of SO 2 to SO 3 .
- a variant of the method consists in branching off a partial flow of the exhaust gas after dedusting the hot exhaust gas and mixing it with the fluidizing gas before it is introduced into the fluidized bed. By recycling part of the exhaust gas and mixing it with the fluidizing gas, the fluidizing gas is heated up. By circulating part of the exhaust gas, SO 2 is enriched in the exhaust gas.
- a refractory gold ore with a gold content of 8 g / t and 1.8% by weight of sulfur, which was present as pyrite, and 0.08% by weight of carbon was used.
- the gold ore contained 3.3 wt% FeS2 and 0.07 wt% Fe [AsS].
- the roasting plant was a circulating fluidized bed plant, mainly consisting of the fluidized bed reactor, a recycle cyclone, which was connected directly to the gas outlet at the top of the reactor, and a recycle line.
- the solid separated in the cyclone was returned to the reactor via the return line.
- a mixture containing 50 g of sulfur per kg of ore was fed into the fluidized bed reactor, and 40 kg / h of the mixture were fed to the fluidized bed reactor via a down pipe.
- the sulfur had the following composition: S 98% by weight, Impurities 2% by weight.
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Description
Die Erfindung betrifft ein Verfahren zum Rösten refraktärer Golderze in oxidierender Atmosphäre in einer Wirbelschicht unter Zusatz von Brennstoffen und unter Zufuhr von sauerstoffhaltigem Gas.The invention relates to a method for refractory roasting Gold ores in an oxidizing atmosphere in a fluidized bed below Addition of fuels and with the addition of oxygenated Gas.
Refraktäre Golderze sind solche Erze, die sich nicht direkt mit NaCN laugen lassen und als Goldträger Arsenopyrite oder Pyrite mit mehr oder weniger organischem Kohlenstoff enthalten. 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 Reaktionswäre 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 are those ores that are not directly related Let NaCN leach and arsenopyrites or pyrites as gold carriers contain with more or less organic carbon. she have a relatively low gold content. For such ores Before the cyanide leaching, the oxidation of the Sulfur and carbon content required. This oxidation is done by roasting with oxygen-containing gases. With many The existing content is sufficient for refractory gold ores Arsenopyrite, pyrite and organic carbon are not used Generation of the required reaction from, and it must Fuel can be added. A variety of refractory Gold ores must be roasted at a relatively low temperature, thus good gold yield during the subsequent leaching is achieved.
Aus der EP-A-0 508 542 ist bekannt, daß Golderze bei einer Temperatur von 475 bis 600°C und insbesondere bei 500 bis 575°C, vorzugsweise bei 500-550°C, geröstet werden sollen, wobei man unter anderem Pyrit zugeben kann. Als Brennstoffzusatz werden Kohle, Butan oder Propan genannt. Die Zündtemperatur soll dem des Propans entsprechen oder niedriger liegen. Propan und Butan werden jedoch nur zu einem unbefriedigenden Teil zu CO2 und H2O verbrannt. Bei der Verbrennung entstehen erhebliche Mengen an CO mit einer Zündtemperatur von 600 bis 650°C und H2 mit einer Zündtemperatur von 560 bis 580°C.From EP-A-0 508 542 it is known that gold ores are to be roasted at a temperature of 475 to 600 ° C and in particular at 500 to 575 ° C, preferably at 500-550 ° C, among other things adding pyrite can. Coal, butane or propane are mentioned as fuel additives. The ignition temperature should be the same as or lower than that of propane. However, only an unsatisfactory amount of propane and butane are burned to CO 2 and H 2 O. The combustion produces significant amounts of CO with an ignition temperature of 600 to 650 ° C and H 2 with an ignition temperature of 560 to 580 ° C.
Golderze erfordern eine schonende Röstung, um Erhitzungen an der Partikeloberfläche zu vermeiden. Die Goldausbeute ist u. a. stark von der Rösttemperatur abhängig. Die Rösttemperatur muß unterhalb der Versinterungstemperatur der Bestandteile des jeweiligen Erzes gehalten werden.Gold ores require gentle roasting to prevent heating on the Avoid particle surface. The gold yield is u. a. strongly dependent on the roasting temperature. The roasting temperature must below the sintering temperature of the components of the ore.
Die meisten Golderze weisen niedrige Anteile an Pyrit und/oder anorganischem Kohlenstoff auf. Bedingt durch Wärmeverluste, die beim Aufheizen entstehen, durch Abgasverluste sowie Austragsverluste und dergleichen reicht der im Golderz enthaltene Heizwert nicht aus, um eine autotherme Röstung selbst bei Temperaturen von etwa nur 500°C durchzuführen. Daher ist der Einsatz von zusätzlichem Brennstoff mit einer niedrigen Zünd- und Verbrennungstemperatur erforderlich, um die Goldausbeute nicht zu verringern. Most gold ores have low levels of pyrite and / or inorganic carbon. Due to heat loss, the arise during heating, through exhaust gas losses as well Loss of discharge and the like is enough in gold ore contained calorific value does not mean an autothermal roasting itself to be carried out at temperatures of only about 500 ° C. Hence the Use of additional fuel with a low ignition and combustion temperature required to the gold yield not to decrease.
Der Erfindung liegt die Aufgabe zugrunde, einen Brennstoff einzusetzen, der bei niedrigen Temperaturen zuverlässig zündet und bei dessen Verbrennung keine oder niedrige Anteile an CO, H2 und Kohlenwasserstoffen im Abgas vorhanden sind.The invention has for its object to use a fuel that ignites reliably at low temperatures and when it is burned, no or low levels of CO, H 2 and hydrocarbons are present in the exhaust gas.
Die Lösung der Aufgabe erfolgt erfindungsgemäß bei dem eingangs genannten Verfahren wobei die Röstung bei Temperaturen von 500 bis 550°C erfolgt dadurch, daß als Brennstoff elementarer Schwefel in die Wirbelschicht zugegeben wird. Der Vorteil des erfindungsgemäßen Verfahrens liegt darin, daß CO, H2 und Kohlenwasserstoffe bei der Verbrennung von Schwefel nicht gebildet werden.The object is achieved according to the invention in the process mentioned at the outset, and the roasting takes place at temperatures of 500 to 550 ° C. by adding elemental sulfur to the fluidized bed as fuel. The advantage of the process according to the invention is that CO, H 2 and hydrocarbons are not formed during the combustion of sulfur.
Schwefel zeigt eine überraschend zuverlässige Zündbereitschaft bei niedrigen Rösttemperaturen und brennt im Temperaturbereich von 200 bis 300°C. Die Zugabe von Schwefel kann durch vorherige Mischung mit dem Golderz oder direkt in die Wirbelschicht erfolgen.Sulfur shows a surprisingly reliable readiness to ignite at low roasting temperatures and burns in the temperature range from 200 to 300 ° C. The addition of sulfur can be done by previous Mix with the gold ore or directly into the fluidized bed respectively.
Die Röstung der refraktären Golderze erfolgt in einer klassischen oder in einer zirkulierenden Wirbelschicht. Die sauerstoffhaltigen Gase werden als Fluidisierungsgas unterhalb des Düsenbodens in die Wirbelschicht eingeleitet. Auch ist vorgesehen, daß sauerstoffhaltige Gase zusätzlich als Primär- und Sekundärgas seitlich in den Wirbelschichtreaktor eingeleitet werden können. Die sauerstoffhaltigen Gase sind Luft oder sauerstoffangereicherte Luft.The refractory gold ores are roasted in one classic or in a circulating fluidized bed. The Oxygenated gases are used as the fluidizing gas below the bottom of the nozzle into the fluidized bed. Is too provided that oxygen-containing gases are also used as primary and secondary gas are introduced laterally into the fluidized bed reactor can be. The oxygen-containing gases are air or oxygen-enriched air.
Eine bevorzugte Ausgestaltung der Erfindung besteht darin, daß als Brennstoff neben dem Schwefel mindestens ein zusätzlicher Brennstoff, ausgewählt aus Kohlenwasserstoffen mit einer C-Atomzahl von 1 bis 16, Alkoholen mit einer C-Atomzahl von 1 bis 6 und einer OH-Gruppenzahl von 1 bis 2, organischen Äthern mit einer C-Atomzahl von 2 bis 8 und einer O-Atomzahl von 1, CS2 oder H2S in die Wirbelschicht zugegeben wird. Durch das gemeinsame Verbrennen von Schwefel mit einem oder mehreren dieser zusätzlichen Brennstoffe wird die Zündtemperatur dieser Brennstoffe herabgesetzt, wenn die Zündtemperatur dieser zusätzlichen Brennstoffe höher liegt als die Zündtemperatur des Schwefels. Das bedeutet, daß sie in einem solchen Gemisch schneller zünden und leichter verbrennen. Liegt die Zündtemperatur eines dieser zusätzlichen Brennstoffe niedriger als die Zündtemperatur von Schwefel, so wird die Zündtemperatur im Gemisch mit einem solchen zusätzlichen Brennstoff herabgesetzt.A preferred embodiment of the invention consists in that in addition to the sulfur, at least one additional fuel selected from hydrocarbons with a number of carbon atoms of 1 to 16, alcohols with a number of carbon atoms from 1 to 6 and an number of OH groups of 1 to as the fuel 2, organic ethers with a C atom number of 2 to 8 and an O atom number of 1, CS 2 or H 2 S is added to the fluidized bed. By burning sulfur together with one or more of these additional fuels, the ignition temperature of these fuels is reduced if the ignition temperature of these additional fuels is higher than the ignition temperature of the sulfur. This means that they ignite faster and burn more easily in such a mixture. If the ignition temperature of one of these additional fuels is lower than the ignition temperature of sulfur, the ignition temperature in a mixture with such an additional fuel is reduced.
Im Gemisch mit Schwefel muß die Konzentration der zusätzlichen Brennstoffe höher liegen als die Konzentration für die untere Zündgrenze dieser Brennstoffe. Die untere Zündgrenze eines Brennstoffes bedeutet die Mindestkonzentration, mit der ein Brennstoff im Gasgemisch vorliegen muß, damit noch eine Zündung des Brennstoffes erfolgt. Die zusätzlichen Brennstoffe werden oberhalb ihrer Zündgrenze zugegeben, wenn der Wärmeinhalt im Reaktor nicht ausreicht, um die erforderliche Rösttemperatur zu erreichen. Der Wärmeinhalt im Reaktor ist gegeben durch die in refraktären Golderzen vorhandenen Mengen an Kohlenstoff und Schwefel und durch die Menge des als Brennstoff zugegebenen Schwefels. Die Rösttemperatur kann somit durch Dosierung der zusätzlichen Brennstoffe gesteuert werden. Die zusätzlichen Brennstoffe werden in solchen Mengen zugegeben, daß die Rösttemperatur 550°C nicht übersteigt und das Abgas aus der Wirbelschicht einen H2-Gehalt von < 10 vppm, vorzugsweise < 5 vppm, einen CO-Gehalt von < 0,1 Vol.-%, vorzugsweise < 100 vppm, und einen Kohlenwasserstoffgehalt von < 100 vppm, vorzugsweise < 50 vppm, aufweist.In a mixture with sulfur, the concentration of the additional fuels must be higher than the concentration for the lower ignition limit of these fuels. The lower ignition limit of a fuel means the minimum concentration with which a fuel must be present in the gas mixture so that the fuel is still ignited. The additional fuels are added above their ignition limit if the heat content in the reactor is not sufficient to achieve the required roasting temperature. The heat content in the reactor is given by the amounts of carbon and sulfur present in refractory gold ores and by the amount of sulfur added as fuel. The roasting temperature can thus be controlled by metering the additional fuels. The additional fuels are added in amounts such that the roasting temperature does not exceed 550 ° C. and the exhaust gas from the fluidized bed has an H 2 content of <10 vppm, preferably <5 vppm, a CO content of <0.1 vol. %, preferably <100 vppm, and a hydrocarbon content of <100 vppm, preferably <50 vppm.
Als zusätzliche Brennstoffe werden Kohlenwasserstoffgemische, die als Destillationsfraktionen, wie z. B. Kerosin usw. oder Raffinerie-Abfallprodukte anfallen, verwendet. Neben Kohlenwasserstoffgemischen werden als zusätzliche Brennstoffe auch Alkoholgemische, die bei der Destillation von Äthanol als Abfallprodukte anfallen, verwendet.Hydrocarbon mixtures, which as distillation fractions, such as. B. kerosene etc. or Refinery waste products are used. Next Hydrocarbon mixtures are used as additional fuels also alcohol mixtures that are used in the distillation of ethanol Waste products are used.
Eine bevorzugte Ausgestaltung der Erfindung besteht darin, daß 60 bis 80 % des Golderzes eine Korngröße unter 75 µm aufweisen. Diese Korngröße ergibt besonders gute Ergebnisse. Der Begriff "Korngröße" steht für den mittleren Korndurchmesser d50.A preferred embodiment of the invention is that 60 to 80% of the gold ore have a grain size below 75 microns. This grain size gives particularly good results. The term "grain size" stands for the mean grain diameter d 50 .
Eine bevorzugte Ausgestaltung der Erfindung besteht darin, daß der O2-Gehalt in dem Gas, das in die Wirbelschicht eingeleitet wird, 20 bis 50 Vol.-% beträgt. Die sauerstoffangereicherte Luft ergibt eine bessere Zündung des Brennstoffgemisches. Die Verwendung der sauerstoffangereicherten Luft ist besonders wirtschaftlich.A preferred embodiment of the invention is that the O 2 content in the gas which is introduced into the fluidized bed is 20 to 50% by volume. The oxygen-enriched air results in a better ignition of the fuel mixture. The use of oxygen-enriched air is particularly economical.
Der Vorteil des Einsatzes der zusätzlichen Brennstoffe liegt darin, daß sie bei niedriger Temperatur weitgehend verbrennen, die Anteile an CO, H2 und Kohlenwasserstoffen im Abgas sehr niedrig sind und daher nicht durch Nachverbrennung aus dem Abgas entfernt zu werden brauchen. Bei einer nachfolgenden Schwefelsäure-Herstellung ist es günstig, daß die Anteile an CO, H2 und Kohlenwasserstoffen sehr niedrig sind, da diese Stoffe bei der Oxidation von SO2 zu SO3 als Katalysator wirken. The advantage of using the additional fuels is that they largely burn at low temperature, the proportions of CO, H 2 and hydrocarbons in the exhaust gas are very low and therefore do not need to be removed from the exhaust gas by post-combustion. In a subsequent sulfuric acid production, it is favorable that the proportions of CO, H 2 and hydrocarbons are very low, since these substances act as a catalyst in the oxidation of SO 2 to SO 3 .
Eine Verfahrensvariante besteht darin, daß ein Teilstrom des Abgases nach der Entstaubung des heißen Abgases abgezweigt und dem Fluidisierungsgas vor der Einleitung in die Wirbelschicht zugemischt wird. Durch die Rückführung eines Teils des Abgases und Vermischen mit dem Fluidisierungsgas wird erreicht, daß das Fluidisierungsgas aufgewärmt wird. Durch die Kreislaufführung eines Teils des Abgases wird eine Anreicherung von SO2 im Abgas erreicht.A variant of the method consists in branching off a partial flow of the exhaust gas after dedusting the hot exhaust gas and mixing it with the fluidizing gas before it is introduced into the fluidized bed. By recycling part of the exhaust gas and mixing it with the fluidizing gas, the fluidizing gas is heated up. By circulating part of the exhaust gas, SO 2 is enriched in the exhaust gas.
Es wurde ein refraktäres Golderz mit einem Goldgehalt von 8 g/t und 1,8 Gew.-% Schwefel, der als Pyrit vorlag, und 0,08 Gew.-% Kohlenstoff eingesetzt. Die Korngröße betrug d50 = 30 µm und 100 % < 200 µm. Das Golderz enthielt 3,3 Gew.-% FeS2 und 0,07 Gew.-% Fe[AsS].A refractory gold ore with a gold content of 8 g / t and 1.8% by weight of sulfur, which was present as pyrite, and 0.08% by weight of carbon was used. The grain size was d 50 = 30 µm and 100% <200 µm. The gold ore contained 3.3 wt% FeS2 and 0.07 wt% Fe [AsS].
Die Röstanlage war eine zirkulierende Wirbelschichtanlage,
hauptsächlich bestehend aus dem Wirbelschichtreaktor, einem
Rückführzyklon, der direkt an den Gasaustritt am Oberteil des
Reaktors angeschlossen war, und einer Rückführleitung. Der im
Zyklon abgeschiedene Feststoff wurde über die Rückführleitung in
den Reaktor zurückgeführt. In den Wirbelschichtreaktor wurde ein
Gemisch aufgegeben, das 50 g Schwefel pro kg Erz enthielt, und
es wurden 40 kg/h des Gemisches über eine Fall-Leitung dem
Wirbelschichtreaktor aufgegeben. Der Schwefel hatte die folgende
Zusammensetzung:
In den Windkasten des Wirbelschichtreaktors wurden 22 Nm3/h lufthaltiges Trägergas mit 32 Vol.-% O2 eingeleitet, das durch zurückgeführtes Abgas 7 Vol.-% SO2 enthielt und eine Temperatur von 400°C hatte. Das Trägergas strömte durch die Öffnungen des Anströmbodens. Die Temperatur im Reaktor betrug 520°C. Das Röstgas hatte einen Gehalt von 12,7 Vol.-% SO2, 0,1 Vol.-% CO2, 5 vppm CO und 24,2 Vol.-% O2. Die Gehalte an H2 und Kohlenwasserstoffen lagen unterhalb der Nachweisgrenze von 1 vppm. Das Röstgut hatte einen Schwefelgehalt von < 0,04 Gew.-% und einen Kohlenwasserstoffgehalt von < 0,01 Gew.-%. Bei der Weiterverarbeitung wurde eine Goldausbeute von 96 % erzielt.22 Nm 3 / h of air-containing carrier gas with 32% by volume of O 2 , which contained 7% by volume of SO 2 and was at a temperature of 400 ° C. by recirculated exhaust gas, were introduced into the wind box of the fluidized bed reactor. The carrier gas flowed through the openings of the inflow floor. The temperature in the reactor was 520 ° C. The roasting gas contained 12.7% by volume of SO 2 , 0.1% by volume of CO 2 , 5 vppm of CO and 24.2% by volume of O 2 . The levels of H 2 and hydrocarbons were below the detection limit of 1 vppm. The roasted material had a sulfur content of <0.04% by weight and a hydrocarbon content of <0.01% by weight. A gold yield of 96% was achieved during further processing.
Claims (5)
- A method for roasting refractory gold ores in an oxidising atmosphere in a fluidised bed with the addition of fuels and with oxygen-containing gas being supplied, the roasting being effected at temperatures of 500 to 550°C, characterised in that elemental sulphur is added to the fluidised bed as fuel.
- A method according to Claim 1, characterised in that at least one additional fuel, selected from hydrocarbons having a number of carbon atoms from 1 to 16, alcohols having a number of carbon atoms from 1 to 6 and a number of OH groups from 1 to 2, organic ethers having a number of carbon atoms from 2 to 8 and a number of O atoms of 1, CS2 or H2S is added to the fluidised bed as fuel in addition to sulphur.
- A method according to Claim 1 or 2, characterised in that 60 to 80% of the gold ore to be roasted has a size of less than 75 µm.
- A method according to one of Claims 1 to 3, characterised in that the O2 content of the gas which is introduced into the fluidised bed is 20 to 50% by volume.
- A method according to one of Claims 1 to 4, characterised in that the roasting is effected in a circulating fluidised bed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4329417A DE4329417C1 (en) | 1993-09-01 | 1993-09-01 | Process for roasting refractory gold ores |
| DE4329417 | 1993-09-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0641864A1 EP0641864A1 (en) | 1995-03-08 |
| EP0641864B1 true EP0641864B1 (en) | 1998-03-04 |
Family
ID=6496516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94202265A Expired - Lifetime EP0641864B1 (en) | 1993-09-01 | 1994-08-05 | Process for roasting refractory gold ores |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0641864B1 (en) |
| AU (1) | AU672715B2 (en) |
| DE (2) | DE4329417C1 (en) |
| ES (1) | ES2113050T3 (en) |
| PE (1) | PE11195A1 (en) |
| ZA (1) | ZA946709B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6482373B1 (en) | 1991-04-12 | 2002-11-19 | Newmont Usa Limited | Process for treating ore having recoverable metal values including arsenic containing components |
| DE4314231A1 (en) * | 1993-04-30 | 1994-11-03 | Metallgesellschaft Ag | Process for roasting refractory gold ores |
| DE19546538A1 (en) * | 1995-12-13 | 1997-06-19 | Metallgesellschaft Ag | Process for the thermal treatment of refractory gold ores |
| US5972302A (en) * | 1996-08-27 | 1999-10-26 | Emr Microwave Technology Corporation | Method for the microwave induced oxidation of pyritic ores without the production of sulphur dioxide |
| EP0950122A1 (en) * | 1996-08-27 | 1999-10-20 | EMR Microwave Technology Corporation | Method for microwave induced oxidation of sulphidic ore material in fluidized bed without sulphur dioxide emissions |
| AUPQ078399A0 (en) * | 1999-06-04 | 1999-06-24 | Tox Free Systems Limited | Recovery of gold from gold sulphides |
| ATE292197T1 (en) | 2001-09-14 | 2005-04-15 | Alexander Beckmann | METHOD FOR EXTRACTING COBALT AND NICKEL FROM ORE AND ORE CONCENTRATES |
| EP1327693A1 (en) * | 2002-01-12 | 2003-07-16 | Alexander Beckmann | Process for extracting cobalt and nickel from ores and ore concentrates |
| RU2443790C1 (en) * | 2010-07-01 | 2012-02-27 | Открытое акционерное общество "Иркутский научно-исследовательский институт благородных и редких металлов и алмазов" ОАО "Иргиредмет" | Method for determining content of precious metals in ores and their derivatives |
| AP2015008652A0 (en) | 2013-02-20 | 2015-08-31 | Outotec Finland Oy | Process and plant for producing copper and/or cobalt sulfate |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4103965C1 (en) * | 1991-02-09 | 1992-04-09 | Metallgesellschaft Ag, 6000 Frankfurt, De | |
| ES2117028T3 (en) * | 1991-04-12 | 1998-08-01 | Metallgesellschaft Ag | PROCEDURE FOR THE TREATMENT OF MINERAL WITH VALUE OF RECOVERABLE METALS INCLUDING ARSENIC-CONTAINING COMPONENTS. |
| 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 |
-
1993
- 1993-09-01 DE DE4329417A patent/DE4329417C1/en not_active Expired - Lifetime
-
1994
- 1994-08-05 EP EP94202265A patent/EP0641864B1/en not_active Expired - Lifetime
- 1994-08-05 ES ES94202265T patent/ES2113050T3/en not_active Expired - Lifetime
- 1994-08-05 DE DE59405354T patent/DE59405354D1/en not_active Expired - Fee Related
- 1994-08-23 PE PE1994248998A patent/PE11195A1/en not_active IP Right Cessation
- 1994-08-30 AU AU71583/94A patent/AU672715B2/en not_active Expired
- 1994-09-01 ZA ZA946709A patent/ZA946709B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| EP0641864A1 (en) | 1995-03-08 |
| ZA946709B (en) | 1995-04-21 |
| ES2113050T3 (en) | 1998-04-16 |
| AU672715B2 (en) | 1996-10-10 |
| AU7158394A (en) | 1995-03-16 |
| PE11195A1 (en) | 1995-05-06 |
| DE4329417C1 (en) | 1994-08-18 |
| DE59405354D1 (en) | 1998-04-09 |
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