[go: up one dir, main page]

WO1997021842A1 - Process for thermal treatment of refractory gold ores - Google Patents

Process for thermal treatment of refractory gold ores Download PDF

Info

Publication number
WO1997021842A1
WO1997021842A1 PCT/EP1996/005453 EP9605453W WO9721842A1 WO 1997021842 A1 WO1997021842 A1 WO 1997021842A1 EP 9605453 W EP9605453 W EP 9605453W WO 9721842 A1 WO9721842 A1 WO 9721842A1
Authority
WO
WIPO (PCT)
Prior art keywords
thermal treatment
water
refractory gold
gold ores
pyrite
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.)
Ceased
Application number
PCT/EP1996/005453
Other languages
German (de)
French (fr)
Inventor
Bodo Peinemann
Gurudas Samant
Peter Sturm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GEA Group AG
Original Assignee
Metallgesellschaft AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Metallgesellschaft AG filed Critical Metallgesellschaft AG
Priority to EA199800550A priority Critical patent/EA000477B1/en
Priority to BR9611943A priority patent/BR9611943A/en
Publication of WO1997021842A1 publication Critical patent/WO1997021842A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • 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
    • 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

Definitions

  • the invention relates to a method for the thermal treatment of refractory gold ores, with contents of ar ⁇ enopyrite, pyrite and organic carbon which are insufficient for the generation of the required heat of reaction in an oxidizing atmosphere with the addition of fuel.
  • the arsenopyrite, pyrite or organic carbon content is not sufficient to produce the required heat of reaction by roasting with oxygen-containing gases, so that fuel must therefore be added.
  • Sulfur and / or pyrite are added as fuel and the roasting is carried out at temperatures of 400 to 650 ° C. with the supply of oxygen-containing gases in a classic or circulating fluidized bed.
  • Hydrocarbons, hydrocarbon mixtures or refinery waste products are used as additional fuels (DE-C-4329417).
  • This object is achieved in such a way that the thermal treatment of the refractory gold ores is carried out with the addition of water or steam.
  • water or water vapor is expediently such that the water vapor content of the exhaust gas is 10 to 30%.
  • water or water vapor is partially, preferably up to 15%, replaced by one or more hydrocarbons, in particular kerosene and gasoline, which serve to form water or water vapor.
  • the process according to the invention is based on refractory gold ores with contents of 0.01 to 1.0% by weight arsenopyrite, 1 to 3.3% by weight pyrite, 0.02 to 0.1% by weight carbon and 0.1 up to 5.0 wt .-% CaC0 3 • MgC0 3 or CaC0 3 applied.
  • 1st embodiment 1st embodiment:
  • a refractory gold ore with a grain size d so 30 ⁇ m and 100% ⁇ 200 ⁇ m with a gold content of 8 g / t and 0.5% by weight sulfur, which was present as pyrite, and 0.08% by weight Carbon used.
  • the plant was a circulating fluidized bed plant for thermal treatment, 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 of 48 g pyrite per kg ore was produced. Then 40 kg / h of the mixture produced were fed into the fluidized bed reactor via a downpipe.
  • Air with a temperature of 400 ° C. was introduced into the wind box of the fluidized bed reactor.
  • the carrier gas flowed through the openings of the inflow floor.
  • the temperature of the reactor was 600 ° C.
  • the roasting gas had a content of 1790 vppm S0 2 , 0.2 vol% CO 2 , 20 vppm CO, 950 vppm NO x and 16.3 vol% 0 2 .
  • the levels of H 2 and hydrocarbons were below the detection limit of 1 vppm.
  • the process was carried out as in the first exemplary embodiment, with the difference that water was added to the fluidized bed reactor.
  • the roasting gas had a content of 645 vppm S0 2 , 0.1 vol .-% C0 2 , 5 vppm CO 167 vppm NO x and 16.8 vol .-% 0 ..
  • the contents of H 2 and hydrocarbons were below the detection limit from 1 vppm.
  • the roast had one Sulfur content of ⁇ 0.04% by weight and a carbon content of ⁇ 0.01% by weight. A gold yield of 96% was achieved during further processing.
  • the circulating fluidized bed consists of the fluidized bed reactor (1), the return cyclone (2) and the return line (3).
  • the fluidized bed reactor (1) had a diameter of 0.16 m and a height of 4 m.
  • Via line (4) 10 kg / h of a mixture of refractory gold ore and additives were charged into the reactor (1) by means of a metering screw. Air was passed via line (5) into the gas heater (6), heated there to 400 ° C. and introduced into the reactor (1) as a fluidizing gas via line (7). The temperature in the reactor was 600 ° C. Water was introduced into the reactor (1) via line (8) and secondary gas via line (9). These consisted of preheated air or oxygen.
  • the roasted material was withdrawn via line (10).
  • a gas-solid suspension was fed into the recycle cyclone (2) from the reactor (1) via line (11).
  • the exhaust gas was removed via line (12).

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)
  • Catalysts (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)

Abstract

Thermal treatment of refractory gold ores takes place in an oxidizing atmosphere as fuel is added. Water or steam is introduced to reduce emission of nitric oxide and sulphur dioxide into the atmosphere.

Description

Verfahren zur thermischen Behandlung refraktärer Golderze Process for the thermal treatment of refractory gold ores

Beschreibungdescription

Die Erfindung betrifft ein Verfahren zur thermischen Behandlung refraktärer Golderze, mit für die Erzeugung der erforderlichen Reaktionswärme nicht ausreichenden Gehalten von Arεenopyrit, Pyrit und organischem Kohlenstoff, in oxidierender Atmosphäre unter Zusatz von Brennstoff.The invention relates to a method for the thermal treatment of refractory gold ores, with contents of arεenopyrite, pyrite and organic carbon which are insufficient for the generation of the required heat of reaction in an oxidizing atmosphere with the addition of fuel.

Bei vielen refraktären Golderzen reicht der vorhandene Gehalt an Arsenopyrit, Pyrit oder organischem Kohlenstoff nicht aus durch Röstung mit sauerstoffhaltigen Gasen die erforderliche Reaktionswärme zu erzeugen, so daß deshalb Brennstoff zugesetzt werden muß. Als Brennstoff werden Schwefel und/oder Pyrit zugegeben und die Röstung bei Temperaturen von 400 bis 650°C unter Zufuhr von sauerstoffhaltigen Gasen in einer klassischen oder zirkulierenden Wirbelschicht durchgeführt. Als zusätzliche Brennstoffe werden Kohlenwasserstoffe, Kohlenwasserstoffgemische oder Raffinerieabfallprodukte eingesetzt (DE-C-4329417) .In the case of many refractory gold ores, the arsenopyrite, pyrite or organic carbon content is not sufficient to produce the required heat of reaction by roasting with oxygen-containing gases, so that fuel must therefore be added. Sulfur and / or pyrite are added as fuel and the roasting is carried out at temperatures of 400 to 650 ° C. with the supply of oxygen-containing gases in a classic or circulating fluidized bed. Hydrocarbons, hydrocarbon mixtures or refinery waste products are used as additional fuels (DE-C-4329417).

Gemäß EP-A-0508542 ist es auch möglich, als Brennstoffzusatz nur Kohle, Butan oder Propan zu verwenden.According to EP-A-0508542, it is also possible to use only coal, butane or propane as fuel additive.

ORIGINALUNTERLAGEN Bei der thermischen Behandlung refraktärer Golderze bilden sich in nicht unerheblichen Mengen Stickoxide (N0X) Schwefeldioxid (SOJ , die aus dem Abgas weitgehend entfernt werden müssen, da sie als Umweltgifte relevant sind. Entsprechende Grenzwerte sind in zahlreichen nationalen Verordnungen zum Emissionsschutz, beispielsweise der 17. Verordnung zur Durchführung des Bundes-EmissionsSchutzgesetzes enthalten.ORIGINAL DOCUMENTS During the thermal treatment of refractory gold ores, not insignificant amounts of nitrogen oxides (N0 X ) sulfur dioxide (SOJ) are formed, which have to be largely removed from the exhaust gas, since they are relevant as environmental toxins Regulation for the implementation of the Federal Emissions Protection Act included.

Es ist die Aufgabe der vorliegenden Erfindung die Durchführung des eingangs beschriebenen Verfahrens so auszugestalten, daß der Eintrag von Stickoxid- und Schwefeldioxid-Emissionen in die Atmosphäre deutlich gesenkt wird, ohne daß dazu ein besonderer Aufwand erforderlich ist.It is the object of the present invention to carry out the method described in the introduction in such a way that the introduction of nitrogen oxide and sulfur dioxide emissions into the atmosphere is significantly reduced without any special effort being required.

Die Lösung dieser Aufgabe erfolgt in der Weise, daß die thermische Behandlung der refraktären Golderze unter Zugabe von Wasser bzw. Wasserdampf durchgeführt wird.This object is achieved in such a way that the thermal treatment of the refractory gold ores is carried out with the addition of water or steam.

Zweckmäßigerweise ist die Zugabe von Wasser bzw. Wasserdampf εo bemessen, daß der Wasserdampfgehalt des Abgases 10 bis 30% beträgt. Nach einem weiteren Erfindungsmerkmal ist Wasser bzw. Wasserdampf teilweise, vorzugsweise bis zu 15 %, durch einen oder mehrere der Wasser- bzw. Wasserdampfbildung dienenden Kohlenwasserstoff, insbesondere Kerosin und Benzin, ersetzt.The addition of water or water vapor is expediently such that the water vapor content of the exhaust gas is 10 to 30%. According to a further feature of the invention, water or water vapor is partially, preferably up to 15%, replaced by one or more hydrocarbons, in particular kerosene and gasoline, which serve to form water or water vapor.

Die Erfindung ist nachfolgend anhand eines Vergleichs zweier Ausführungsbeispiele näher erläutert. Das erfindungsgemäße Verfahren wird auf refraktäre Golderze mit Gehalten von 0,01 bis 1,0 Gew.-% Arsenopyrit, 1 bis 3,3 Gew.-% Pyrit, 0,02 bis 0,1 Gew.-% Kohlenstoff und 0,1 bis 5,0 Gew.-% CaC03 • MgC03 bzw. CaC03 angewendet. 1. Ausführungsbeispiel:The invention is explained in more detail below on the basis of a comparison of two exemplary embodiments. The process according to the invention is based on refractory gold ores with contents of 0.01 to 1.0% by weight arsenopyrite, 1 to 3.3% by weight pyrite, 0.02 to 0.1% by weight carbon and 0.1 up to 5.0 wt .-% CaC0 3 • MgC0 3 or CaC0 3 applied. 1st embodiment:

Es wurde ein refraktäres Golderz mit einer Korngröße dso = 30 μm und 100 % < 200 μm mit einem Goldgehalt von 8 g/t und 0,5 Gew.-% Schwefel, der als Pyrit vorlag, und 0,08 Gew.-% Kohlenstoff eingesetzt. Die Anlage war zur thermischen Behandlung eine zirkulierende Wirbelschichtanlage, hauptsächlich bestehend aus dem Wirbelschichtreaktor, einem Rückführzyklon, der direkt an den Gaεaustritt am Oberteil des Reaktors angeschlossen war, und einer Rückführleitung. Der im Zyklon abgeschiedene Feststoff wurde über die Rückführleitung in den Reaktor zurückgeführt.A refractory gold ore with a grain size d so = 30 μm and 100% <200 μm with a gold content of 8 g / t and 0.5% by weight sulfur, which was present as pyrite, and 0.08% by weight Carbon used. The plant was a circulating fluidized bed plant for thermal treatment, 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.

Es wurde ein Gemisch aus 48g Pyrit pro kg Erz hergestellt. Dann wurden 40 kg/h des hergestellten Gemisches über eine Falleitung in den Wirbelschichtreaktor aufgegeben.A mixture of 48 g pyrite per kg ore was produced. Then 40 kg / h of the mixture produced were fed into the fluidized bed reactor via a downpipe.

In den Windkasten des Wirbelschichtreaktors wurde Luft mit einer Temperatur von 400°C eingeleitet. Das Trägergas strömte durch die Öffnungen des Anströmbodens. Die Temperatur des Reaktors betrug 600°C. Das Röstgas hatte einen Gehalt von 1790 vppm S02, 0,2 Vol.% C02, 20 vppm CO, 950 vppm NOx und 16,3 Vol-% 02. Die Gehalte an H2 und Kohlenwasserstoffen lagen unterhalb der Nachweisgrenze von 1 vppm.Air with a temperature of 400 ° C. was introduced into the wind box of the fluidized bed reactor. The carrier gas flowed through the openings of the inflow floor. The temperature of the reactor was 600 ° C. The roasting gas had a content of 1790 vppm S0 2 , 0.2 vol% CO 2 , 20 vppm CO, 950 vppm NO x and 16.3 vol% 0 2 . The levels of H 2 and hydrocarbons were below the detection limit of 1 vppm.

2. Ausführungsbeispiel :2nd embodiment:

Das Verfahren wurde wie im 1. Ausführungsbeispiel durchgeführt, mit dem Unterschied, daß dem Wirbelschichtreaktor Wasser zugegeben wurde. Das Röstgas hatte einen Gehalt von 645 vppm S02, 0,1 Vol.-% C02, 5 vppm CO 167 vppm NOx und 16,8 Vol.-% 0.. Die Gehalte an H2 und Kohlenwasserstoffen lagen unterhalb der Nachweisgrenze von 1 vppm. Das Röstgut hatte einen Schwefelgehalt von < 0,04 Gew.-% und einen Kohlenstoffgehalt von < 0,01 Gew.-%. Bei der Weiterverarbeitung wurde eine Goldausbeute von 96 % erzielt.The process was carried out as in the first exemplary embodiment, with the difference that water was added to the fluidized bed reactor. The roasting gas had a content of 645 vppm S0 2 , 0.1 vol .-% C0 2 , 5 vppm CO 167 vppm NO x and 16.8 vol .-% 0 .. The contents of H 2 and hydrocarbons were below the detection limit from 1 vppm. The roast had one Sulfur content of <0.04% by weight and a carbon content of <0.01% by weight. A gold yield of 96% was achieved during further processing.

Ein Vergleich der Ergebnisse der beiden Ausführungsbeispiele zeigt, daß die S02- und NOx-Emissionen durch Anwendung des erfindungsgemäßen Verfahrens erheblich geεenkt werden konnten.A comparison of the results of the two exemplary embodiments shows that the S0 2 and NO x emissions could be considerably reduced by using the method according to the invention.

In der Fig. 1 ist eine zweistufige Röstung in einer zirkulierenden Wirbelschicht dargestellt. Die zirkulierende Wirbelschicht besteht aus dem Wirbelschichtreaktor (1) , dem Rückführzyklon (2) und der Rückführleitung (3) . Der Wirbelεchichtreaktor (1) hatte einen Durchmesser von 0,16 m und eine Höhe von 4 m. Über Leitung (4) wurden mittels einer Dosierschnecke 10 kg/h eines Gemischeε auε refraktärem Golderz und Zusatzstoffen in den Reaktor (1) chargiert. Über Leitung (5) wurde Luft in den Gaserhitzer (6) geleitet, dort auf 400°C aufgeheizt und über Leitung (7) als Fluidisierungsgas in den Reaktor (1) eingeleitet. Die Temperatur im Reaktor lag bei 600°C. Über Leitung (8) wurde Wasser und über Leitung (9) Sekundargas in den Reaktor (1) eingeleitet. Diese bestanden auε vorgewärmter Luft bzw. Sauerεtoff. Über Leitung (10) wurde daε Röstgut abgezogen. Über Leitung (11) wurde aus dem Reaktor (1) eine Gas-Feststoff-Suspension in den Rückführzyklon (2) geleitet. Der dort abgeschiedene Feststoff wurde über die Rückführleitung (3) in den Reaktor (1) zurückgeleitet. Über Leitung (12) wurde das Abgas abgeführt. 1 shows a two-stage roasting in a circulating fluidized bed. The circulating fluidized bed consists of the fluidized bed reactor (1), the return cyclone (2) and the return line (3). The fluidized bed reactor (1) had a diameter of 0.16 m and a height of 4 m. Via line (4), 10 kg / h of a mixture of refractory gold ore and additives were charged into the reactor (1) by means of a metering screw. Air was passed via line (5) into the gas heater (6), heated there to 400 ° C. and introduced into the reactor (1) as a fluidizing gas via line (7). The temperature in the reactor was 600 ° C. Water was introduced into the reactor (1) via line (8) and secondary gas via line (9). These consisted of preheated air or oxygen. The roasted material was withdrawn via line (10). A gas-solid suspension was fed into the recycle cyclone (2) from the reactor (1) via line (11). The solid separated there was returned to the reactor (1) via the return line (3). The exhaust gas was removed via line (12).

Claims

Patentansprüche claims 1. Verfahren zur thermischen Behandlung refraktärer Golderze, mit für die Erzeugung der erforderlichen Reaktionswärme nicht ausreichenden Gehalten an Arsenopyrit, Pyrit und organischem Kohlenstoff, in oxidischer Atmosphäre unter Zusatz von Brennstoff mit Ausnahme von Schwefel und Pyrit, dadurch gekennzeichnet, daß die thermische Behandlung unter Zugabe von Wasser bzw. Wasserdampf erfolgt.1. Process for the thermal treatment of refractory gold ores, with insufficient amounts of arsenopyrite, pyrite and organic carbon for the generation of the required heat of reaction, in an oxidic atmosphere with the addition of fuel with the exception of sulfur and pyrite, characterized in that the thermal treatment with addition of water or steam. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß bei der thermiεchen Behandlung soviel Wasser bzw. Wasserdampf zugegeben wird, daß der Wassergehalt im Rauchgas 10 bis 30 % beträgt.2. The method according to claim 1, characterized in that so much water or steam is added in the thermal treatment that the water content in the flue gas is 10 to 30%. 3. Verfahren nach den Anεprüchen 1 und 2 dadurch gekennzeichnet, daß Wasεer bzw. Waεεerdampf teilweise durch einen oder mehrere Kohlenwasserstoffe, insbesondere Kerosin und Benzin ersetzt ist.3. The method according to claims 1 and 2, characterized in that water or water vapor is partially replaced by one or more hydrocarbons, in particular kerosene and gasoline. 4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß bis 15% Wasser bzw. Wasserdampf durch einen oder mehrere Kohlenwasserstoffe ersetzt sind.4. The method according to claim 3, characterized in that up to 15% water or steam are replaced by one or more hydrocarbons. 5. Anwendung des Verfahrens nach Ansprüche 1 bis 3 auf refraktäre Golderze mit Gehalten einem der von 0,01 bis 1,0 Gew.-% Arsenopyrit, 1 bis 3,3 Gew.-% Pyrit, 0,02 bis 0,1 Gew.-% Kohlenstoff, 0,1 bis 5,0 Gew.% Dolomit und/oder Kalk. 5. Application of the method according to claims 1 to 3 to refractory gold ores with a content of one of 0.01 to 1.0 wt .-% arsenopyrite, 1 to 3.3 wt .-% pyrite, 0.02 to 0.1 wt .-% carbon, 0.1 to 5.0 wt.% Dolomite and / or lime.
PCT/EP1996/005453 1995-12-13 1996-12-05 Process for thermal treatment of refractory gold ores Ceased WO1997021842A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EA199800550A EA000477B1 (en) 1995-12-13 1996-12-05 Process for thermal treatment of refractory gold ores
BR9611943A BR9611943A (en) 1995-12-13 1996-12-05 Process for heat treatment of refractory gold ores

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1995146538 DE19546538A1 (en) 1995-12-13 1995-12-13 Process for the thermal treatment of refractory gold ores
DE19546538.5 1995-12-13

Publications (1)

Publication Number Publication Date
WO1997021842A1 true WO1997021842A1 (en) 1997-06-19

Family

ID=7780011

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/005453 Ceased WO1997021842A1 (en) 1995-12-13 1996-12-05 Process for thermal treatment of refractory gold ores

Country Status (6)

Country Link
BR (1) BR9611943A (en)
DE (1) DE19546538A1 (en)
EA (1) EA000477B1 (en)
MX (1) MX9603252A (en)
PE (1) PE85798A1 (en)
WO (1) WO1997021842A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AUPQ078399A0 (en) * 1999-06-04 1999-06-24 Tox Free Systems Limited Recovery of gold from gold sulphides
CN102051491B (en) * 2010-11-19 2012-10-24 中南大学 Method for concentrating gold from pyrite inclusion-type gold ore

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB475254A (en) * 1937-04-23 1937-11-16 Mij Voor Zwavelzuurbereiding V A process for extracting metals from oxidic ores and the like
GB677050A (en) * 1949-11-23 1952-08-06 Dorr Co Roasting of arsenopyrite gold-bearing ores
GB682718A (en) * 1950-03-21 1952-11-12 Dorr Co Process for the heat treatment of ores
US4289529A (en) * 1978-10-10 1981-09-15 Hazen Research, Inc. Process for beneficiating sulfide ores
FR2670503A1 (en) * 1990-12-17 1992-06-19 Ahlstroem Oy PROCESS FOR GRILLING SULPHIDE ORES.
EP0508542A2 (en) * 1991-04-12 1992-10-14 METALLGESELLSCHAFT Aktiengesellschaft Process for treating ore having recoverable metal values including arsenic containing components
DE4329417C1 (en) * 1993-09-01 1994-08-18 Metallgesellschaft Ag Process for roasting refractory gold ores
EP0622467A1 (en) * 1993-04-30 1994-11-02 Metallgesellschaft Ag Process for roasting refractory gold ores

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB475254A (en) * 1937-04-23 1937-11-16 Mij Voor Zwavelzuurbereiding V A process for extracting metals from oxidic ores and the like
GB677050A (en) * 1949-11-23 1952-08-06 Dorr Co Roasting of arsenopyrite gold-bearing ores
GB682718A (en) * 1950-03-21 1952-11-12 Dorr Co Process for the heat treatment of ores
US4289529A (en) * 1978-10-10 1981-09-15 Hazen Research, Inc. Process for beneficiating sulfide ores
FR2670503A1 (en) * 1990-12-17 1992-06-19 Ahlstroem Oy PROCESS FOR GRILLING SULPHIDE ORES.
EP0508542A2 (en) * 1991-04-12 1992-10-14 METALLGESELLSCHAFT Aktiengesellschaft Process for treating ore having recoverable metal values including arsenic containing components
EP0622467A1 (en) * 1993-04-30 1994-11-02 Metallgesellschaft Ag Process for roasting refractory gold ores
DE4329417C1 (en) * 1993-09-01 1994-08-18 Metallgesellschaft Ag Process for roasting refractory gold ores

Also Published As

Publication number Publication date
DE19546538A1 (en) 1997-06-19
EA000477B1 (en) 1999-08-26
BR9611943A (en) 1999-04-06
MX9603252A (en) 1997-06-28
PE85798A1 (en) 1999-01-23
EA199800550A1 (en) 1998-12-24

Similar Documents

Publication Publication Date Title
DE2507343A1 (en) METHOD OF REGENERATING A CRACK CATALYST
US3699037A (en) Catalytic cracking
EP0222452B1 (en) Process for reducing the oxidation level of metallic oxides
DE2552904A1 (en) PROCESS FOR THE REDUCTION OF FINE DISTRIBUTED METAL OXIDE-CONTAINING MATERIAL
DE4329417C1 (en) Process for roasting refractory gold ores
DE4000188A1 (en) METHOD FOR THE DESULFURATION OF GAS-FOAMED EFFLUENTS
DE2256276C3 (en) Cyclic, continuous process for the catalytic cracking of petroleum hydrocarbons in the fluid phase with catalyst regeneration
EP0439742B1 (en) Process for the preparation of oleum and sulfuric acid
WO1997021842A1 (en) Process for thermal treatment of refractory gold ores
DD201807A5 (en) METHOD AND DEVICE FOR DIRECT REDUCTION OF IRON OXIDE
DE3034020A1 (en) REMOVAL OF SULFUR OXIDS FROM THE REGENERATOR EXHAUST GASES FROM A CATALYTIC CRACKING
DE4233140A1 (en) Reducing iron@-contg. material - using reducing gas under pressure in several fluidised bed reactors
EP0042638B1 (en) Process for the heat-desulfuration of combustible or reduction gases
EP0262564A2 (en) Process for the preparation of sulphur dioxide
DE4314231A1 (en) Process for roasting refractory gold ores
DE2438790B2 (en) PROCESS AND SYSTEM FOR THE REDUCTION OF IRON ORES, IN PARTICULAR IRON ORES PELLETS
DE2164008C3 (en) Process for the production of reducing gas
WO2008070885A2 (en) Method for increasing the specific surface of iron oxides in spray roasting plants
DE2727107C2 (en) Process for removing sulfur-containing compounds and soot from the hot, uncooled reducing gases for ore reduction
DE3900069C2 (en)
DE1231219B (en) Continuous cycle process for the production of hydrogen
DE4135720C2 (en) Process for the cleavage of substances containing sodium sulfate or potassium sulfate
DE3920146C2 (en) Method and device for incinerating and desulphurizing gaseous unburned gases and effluents containing SO2, SO3 and / or H2S in the circulating bed
DE2513322B2 (en) Process for the desulfurization of coke
DE1294357B (en) Process for the production of gases consisting essentially of hydrogen and a low-carbon, carbon monoxide-containing reducing gas

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): BR US AM AZ BY KG KZ MD RU TJ TM

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 199800550

Country of ref document: EA

122 Ep: pct application non-entry in european phase