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WO2002061155A1 - Bio-oxydation in situ de mineraux sulfures refractaires maigres - Google Patents

Bio-oxydation in situ de mineraux sulfures refractaires maigres Download PDF

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Publication number
WO2002061155A1
WO2002061155A1 PCT/AU2002/000082 AU0200082W WO02061155A1 WO 2002061155 A1 WO2002061155 A1 WO 2002061155A1 AU 0200082 W AU0200082 W AU 0200082W WO 02061155 A1 WO02061155 A1 WO 02061155A1
Authority
WO
WIPO (PCT)
Prior art keywords
upper layer
low
inoculum
sulphide minerals
grade refractory
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/AU2002/000082
Other languages
English (en)
Inventor
Karen Natasha Mcewan
Christopher Joseph Savage
David Edwin Ralph
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.)
PEKO REHABILITATION PROJECT Pty Ltd
Original Assignee
PEKO REHABILITATION PROJECT Pty Ltd
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 PEKO REHABILITATION PROJECT Pty Ltd filed Critical PEKO REHABILITATION PROJECT Pty Ltd
Priority to AU2002227782A priority Critical patent/AU2002227782B8/en
Publication of WO2002061155A1 publication Critical patent/WO2002061155A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • C22B11/00—Obtaining noble metals
    • C22B11/04—Obtaining noble metals by wet 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
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/18—Extraction of metal compounds from ores or concentrates by wet processes with the aid of microorganisms or enzymes, e.g. bacteria or algae
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to a method for the in-situ bio-oxidation of low-grade refractory sulphide minerals. More particularly, the present invention relates to a method for the in-situ bio-oxidation of low-grade refractory sulphide minerals by microbial leaching.
  • Bacterial leaching of low-grade refractory sulphide ores is known.
  • the low-grade refractory sulphide ore is finely divided and heaped, before an acidic solution is sprayed thereon, encouraging indigenous chemolithotrophic bacterial activity.
  • the applicability of conventional bacterial leaching methods is limited by the generally low reaction rates associated with such.
  • some low-grade refractory sulphide resources, such as gold extraction tailings exhibit limited percolation properties, rendering conventional microbial leaching methods largely ineffective.
  • the body of low-grade refractory sulphide minerals may be provided in the form of a tailings dam, dump or heap.
  • the method of the present invention further comprises the steps of:
  • the method of the present invention further comprises the step of:
  • the steps of flooding the upper layer of the body with an acidic solution and collecting the pregnant solution may be repeated as required before an upper layer is removed.
  • at least a portion of the pregnant solution is used to generate the acidic solution.
  • the method of the present invention comprises the step of:
  • the method of the present invention further comprises the steps of:
  • the method of the present invention comprises the additional step of:
  • the method comprises the step of:
  • the step of promoting microbial activity in the or each upper layer is performed by inoculating the or each upper layer with an inoculum containing chemolithotrophic microbes.
  • the inoculum is formed by the steps of:
  • the chemolithotrophic microbes are capable of oxidising sulphur and iron.
  • the inoculum contains chemolithotrophic microbes of one or more of the following species: Thiobacillus ferrooxidans, Thiobacillus thiooxidans and Leptospirrilium ferrooxidans.
  • the inoculum contains microbes of the Sulfolobus type.
  • the microbial concentration of the inoculum is between about 10 6 and 10 10 cells per ml_.
  • the acidic solution is of a pH between about 1.5 and 2.5.
  • the inoculum is introduced with the acidic solution.
  • the ratio of inoculum to acidic solution is approximately 1:1 by volume.
  • the pH of the solution generated by adding the inoculum to the acidic solution is between about 1.5 and 2.5.
  • the pH of the solution generated by adding the inoculum to the acidic solution is approximately 1.8.
  • the or each step of aerating the surface layer comprises scarifying the surface layer.
  • the pre-determined depth is between about 200mm to about 500mm.
  • indigenous iron and sulphur oxidising microbes are identified from the dam and cultivated to produce an inoculum rich in such, before an upper surface of the gold tailings dam is aerated by scarification to a depth of between 200mm and 500mm.
  • the upper layer is then flooded with an acidic solution containing the inoculum. After a suitable time, the solution is drained or pumped from the dam collection point and recirculated. Concentrations of base metals, such as copper and cobalt, in the run-off are monitored. When the base metal concentrations in the run-off reach a predetermined level, the solution is diverted to a base metal extraction circuit.
  • the tailings solids are periodically tested for gold recovery, and when a predetermined level of oxidation and gold recovery is reached the upper layer is removed, thereby forming a fresh upper layer, and washed.
  • the washings, together with the run-off, are passed to a metal recovery circuit, whilst the solid residue is passed to a gold recovery circuit.
  • the fresh upper layer is then aerated by scarification to a depth of between 200mm and 500mm, and the process repeated until the heap is treated.
  • Samples of the Peko gold extraction tailings were then treated in the laboratory. Samples of the gold extraction tailings were placed in watertight trays. An inoculum was generated by culturing the naturally occurring microbes from the samples. A portion of a sample was combined with water, and the water examined under an optical microscope. Microbes including Thiobacillus ferrooxidans, Thiobacillus thiooxidans and Leptospirrilium ferrooxidans were identified.
  • the indigenous microbes were cultivated by conventional means before being introduced into a vessel containing an acidic solution and low-grade sulphide ore, where concentrations of microbes were allowed to reach approximately 10 6 and 10 10 cells per mL Subsequent portions of inoculum were generated by simply refilling the vessel and allowing the microbes to proliferate. Each sample was aerated by scarification, and a solution of pH between 1.5 and 2.5 was combined with the inoculum to a ratio of 1 :1 by volume, and used to flood an upper layer of the sample.
  • Cobalt, copper and gold dissolution after predetermined periods are reported in Table 2.
  • Gold dissolution results were based on bottle roll cyanidation test work on the oxidation residues.
  • the present invention provides a method for the in-situ bio-oxidation of refractory sulphide minerals by bacterial leaching exhibiting improved reaction rates over traditional biological heap leaching methods, involving preparing a pad and spraying acidified water onto the surface of the tailings. Further, the present invention provides a method for the in- situ bio-oxidation of refractory sulphide minerals by bacterial leaching effective in the treatment of low-grade refractory sulphide ores exhibiting limited percolation.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Biotechnology (AREA)
  • Geology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Microbiology (AREA)
  • Biochemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)

Abstract

Procédé destiné à la bio-oxydation in situ de minéraux sulfurés réfractaires, le procédé consistant en ce qui suit: aérer une couche supérieure d'un corps de minéraux sulfurés réfractaires maigres jusqu'à une profondeur prédéterminée; inonder la couche supérieure du corps avec une solution acide de manière à dissoudre les métaux qu'elle contient pour former un jus fort; et collecter le jus fort depuis le corps.
PCT/AU2002/000082 2001-01-30 2002-01-29 Bio-oxydation in situ de mineraux sulfures refractaires maigres Ceased WO2002061155A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002227782A AU2002227782B8 (en) 2001-01-30 2002-01-29 In-situ bio-oxidation of low-grade refractory sulphide minerals

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPR2775A AUPR277501A0 (en) 2001-01-30 2001-01-30 In-situ bio-oxidation of low-grade refractory sulphide minerals
AUPR2775 2001-01-30

Publications (1)

Publication Number Publication Date
WO2002061155A1 true WO2002061155A1 (fr) 2002-08-08

Family

ID=3826802

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2002/000082 Ceased WO2002061155A1 (fr) 2001-01-30 2002-01-29 Bio-oxydation in situ de mineraux sulfures refractaires maigres

Country Status (2)

Country Link
AU (1) AUPR277501A0 (fr)
WO (1) WO2002061155A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003102253A1 (fr) * 2002-05-31 2003-12-11 Technological Resources Pty Ltd Lixiviation en tas
CN100402677C (zh) * 2007-04-16 2008-07-16 中南大学 铜矿石细菌地下堆浸工艺
AU2003229403B2 (en) * 2002-05-31 2008-08-14 Technological Resources Pty Ltd Heap leaching

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5779762A (en) * 1994-10-25 1998-07-14 Geobiotics, Inc. Method for improving the heap biooxidation rate of refractory sulfide ore particles that are biooxidized using recycled bioleachate solution
WO2000037690A1 (fr) * 1998-12-18 2000-06-29 The University Of British Columbia Procede de lixivation biologique catalysee a l'argent pour l'extraction du cuivre dans la chalcopyrite en tas
WO2000071763A1 (fr) * 1999-05-19 2000-11-30 Bactech (Australia) Pty Ltd. Amelioration apportee a un procede de lixiviation en tas de chalcopyrite
WO2001016385A1 (fr) * 1999-09-01 2001-03-08 Billiton Sa Limited Recuperation de metal de base a partir d'un terril de steriles par oxydation bacterienne
WO2001044519A1 (fr) * 1999-12-15 2001-06-21 Pacific Ore Technology (Australia) Ltd Lixiviation bacterienne en tas

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5779762A (en) * 1994-10-25 1998-07-14 Geobiotics, Inc. Method for improving the heap biooxidation rate of refractory sulfide ore particles that are biooxidized using recycled bioleachate solution
WO2000037690A1 (fr) * 1998-12-18 2000-06-29 The University Of British Columbia Procede de lixivation biologique catalysee a l'argent pour l'extraction du cuivre dans la chalcopyrite en tas
WO2000071763A1 (fr) * 1999-05-19 2000-11-30 Bactech (Australia) Pty Ltd. Amelioration apportee a un procede de lixiviation en tas de chalcopyrite
WO2001016385A1 (fr) * 1999-09-01 2001-03-08 Billiton Sa Limited Recuperation de metal de base a partir d'un terril de steriles par oxydation bacterienne
WO2001044519A1 (fr) * 1999-12-15 2001-06-21 Pacific Ore Technology (Australia) Ltd Lixiviation bacterienne en tas

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003102253A1 (fr) * 2002-05-31 2003-12-11 Technological Resources Pty Ltd Lixiviation en tas
ES2238940A1 (es) * 2002-05-31 2005-09-01 Technological Resources Pty Ltd Lixiviacion en pila.
ES2238940B2 (es) * 2002-05-31 2007-12-01 Technological Resources Pty Ltd Lixiviacion en pila.
AU2003229403B2 (en) * 2002-05-31 2008-08-14 Technological Resources Pty Ltd Heap leaching
AU2003229403C1 (en) * 2002-05-31 2012-12-20 Technological Resources Pty Ltd Heap leaching
US8486177B2 (en) 2002-05-31 2013-07-16 Technological Resources Pty Ltd Heap leaching
CN100402677C (zh) * 2007-04-16 2008-07-16 中南大学 铜矿石细菌地下堆浸工艺

Also Published As

Publication number Publication date
AUPR277501A0 (en) 2001-02-22

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