NZ752376B2 - Metal recovery process - Google Patents
Metal recovery processInfo
- Publication number
- NZ752376B2 NZ752376B2 NZ752376A NZ75237617A NZ752376B2 NZ 752376 B2 NZ752376 B2 NZ 752376B2 NZ 752376 A NZ752376 A NZ 752376A NZ 75237617 A NZ75237617 A NZ 75237617A NZ 752376 B2 NZ752376 B2 NZ 752376B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- metal
- microorganism
- target metal
- aqueous solution
- barren
- Prior art date
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
- B01J2220/4868—Cells, spores, bacteria
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/286—Treatment of water, waste water, or sewage by sorption using natural organic sorbents or derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
- C02F1/385—Treatment of water, waste water, or sewage by centrifugal separation by centrifuging suspensions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/341—Consortia of bacteria
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/20—Bacteria; Culture media therefor
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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
- 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
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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
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/22—Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means, or by thermal decomposition
- C22B3/24—Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means, or by thermal decomposition by adsorption on solid substances, e.g. by extraction with solid resins
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- 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
Abstract
The invention relates to a process for recovering metals from aqueous solutions or solid feedstocks such as ores and waste. In particular, the invention relates to a method of recovering a target metals, such as gold, using a microorganism.
Claims (18)
1. A method of ring a target metal from a pregnant aqueous solution containing dissolved target metal, the method comprising: (a) a dissolution step comprising dissolving the target metal from a solid feedstock material with a lixiviant to form a nt aqueous solution containing target metal ions; (b) a ption step comprising contacting a microorganism with the pregnant aqueous solution such that at least a portion of the dissolved target metal biosorb to the microorganism, wherein the microorganism becomes metal laden and the nt aqueous solution s a barren solution; (c) a separating step comprising ting the metal laden microorganism from the barren on; and (d) a recovery step comprising recovery of the target metal from the metal laden microorganism; n the concentration factor of the target metal from the pregnant aqueous solution to the microorganism is greater than 5, and wherein the target metal is gold and the lixiviant solution is a halogen-based solution.
2. The method of claim 1 wherein the nt aqueous solution contains more than 10ppm of the target metal.
3. The method of claim 1 or 2 wherein the barren aqueous solution contains less than 1ppm of the target metal.
4. The method of any one of the previous claims wherein in the biosorption step the microorganism is in contact with the pregnant aqueous solution for between about 0.5 and 48 hours.
5. The method of any one of the previous claims wherein the microorganism is a Gram-negative or Gram-positive bacteria.
6. The method of any one of the previous claims wherein the microorganism is selected from an environment where the target metal is found in a physiologically nt amount.
7. The method of any one of the previous claims wherein the separation step includes at least one of: gravity separation of the metal laden microorganism from the barren aqueous solution and removal of the barren solution, fugation and removal of the barren solution; filtration of the metal laden microorganism from the barren solution.
8. The method of claim 9 wherein at least 60% by volume of the barren aqueous solution is removed.
9. The method of any one of the previous claims wherein the recovery step includes contacting the metal laden microorganism with a condition which triggers the microorganism to desorb the target metal.
10. The method of claim 9 wherein the condition is a solution containing a compound that rs desorption of the target metal, wherein the nd is selected from any one or more of cysteine, or thiosulphate, or thiourea.
11. The method of claim 9 wherein the condition that triggers desorption of the target metal is a pH less than 5.
12. The method of any one of claims 1 to 8 wherein the recovery step includes burning or chemical dissolution of the metal laden microorganism to desorb the target metal.
13. The method of any one of claims 1 to 12 wherein the nt aqueous solution includes at least one further metal, and the microorganism preferentially biosorbs the target metal over the further metal in the biosorption step, and the further metal(s) remains in the barren solution in the separating step.
14. The method of any one of the us claims wherein the pregnant solution includes at least one further metal, and the rganism preferentially biosorbs the target metal over the r metal in the ption step such that the mass ratio of target metal to further metal in the microorganism increases by a factor of at least 2 when compared to the mass ratio in the pregnant s solution.
15. The method of claim 13 or 14 n the further metal is selected from one or more of copper and nickel.
16. The method of any one of the preceding claims wherein the solid feedstock material comprises a solid material comprising less than 5% of target metal.
17. The method of any one of the preceding claims wherein the solid feedstock material is any one or more of an ore, a tailing or electronic waste.
18. The method of any one of the preceding claims wherein the solid feedstock material is gold bearing ore, or gold bearing sand, or gold bearing clay.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NZ72578516 | 2016-10-31 | ||
| PCT/NZ2017/050142 WO2018080326A1 (en) | 2016-10-31 | 2017-10-31 | Metal recovery process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NZ752376A NZ752376A (en) | 2023-12-22 |
| NZ752376B2 true NZ752376B2 (en) | 2024-03-26 |
Family
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