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WO2021181275A1 - Procédé de récupération de métal noble et commun - Google Patents

Procédé de récupération de métal noble et commun Download PDF

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Publication number
WO2021181275A1
WO2021181275A1 PCT/IB2021/051958 IB2021051958W WO2021181275A1 WO 2021181275 A1 WO2021181275 A1 WO 2021181275A1 IB 2021051958 W IB2021051958 W IB 2021051958W WO 2021181275 A1 WO2021181275 A1 WO 2021181275A1
Authority
WO
WIPO (PCT)
Prior art keywords
cyanide
copper
carbon
metal
cucn
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/IB2021/051958
Other languages
English (en)
Inventor
Barend Jacobus BEYLEFELD
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO2021181275A1 publication Critical patent/WO2021181275A1/fr
Anticipated expiration legal-status Critical
Priority to ZA2022/10931A priority Critical patent/ZA202210931B/en
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
    • 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
    • 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
    • C22B11/08—Obtaining noble metals by cyaniding
    • 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

  • This invention relates to a noble and base metal recovery process where cyanide is used.
  • the invention is concerned with such a process in which the comminuted ore is added to a cyanide leach circuit and the solution from the leach circuit is treated with activated carbon which becomes loaded with metal such as gold.
  • the loaded carbon is delivered to an elution plant or desorption circuit where the metal is recovered from the carbon. The carbon is then regenerated for re-use.
  • the loaded copper cyanide carbon is separated from the leach circuit and is passed to a batch or semi- continuous cold elution plant. [0005] From the elution plant the eluted carbon is transferred back to the cyanide adsorption circuit for re-use and the eluate is processed further.
  • the copper in the eluate is then precipitated with a reagent, preferably sulphuric acid at pH 2, to produce CuCN precipitate (or at pH 4.5 with NaSH to produce Cu 2 S).
  • a reagent preferably sulphuric acid at pH 2
  • the precipitated CuCN can be filtered and will then be available for re-use by returning to the Adsorption vessels in the cyanide removal process, or it can be treated further.
  • the cyanide that was complexed with the copper returns after neutralisation and is re-used as free cyanide in the leach circuit. In this way a substantial amount of the cyanide is saved for re-use.
  • the eluate preferably has acid added thereto to reduce its pH to pH 2 and CuCN crystals are then precipitated which can subsequently be converted to Cu 2 0 crystals by a multistage counter current precipitation and filtration process by adding caustic solution and raw water. If desired the final Cu 2 0 crystals can be re dissolved by adding sulphuric acid followed by copper metal electrowinning.
  • the metallic copper is available for sale without additional processing.
  • FIG. 1 there is shown the mined feed resource 10 leading the ore to comminution 12.
  • the comminuted ore solids are transferred to a cyanide leach circuit 14 including activated carbon all contained at about pH 10 to pH 11.
  • the solids and solution from the leach circuit 14 are transferred to cyanide recovery adsorption circuit 16 which uses 1 to 6 mixing vessels or upflow vessels which improves the mixing and adsorption efficiency and increases precious and base metal recovery.
  • Copper which may be Cu, CuCN, Cu 2 0 or CuO, is added from a feed 18 in the circuit 16 to react with the cyanide to form predominately cuprocyanide complexes i.e., Cu (CN) 2 or Cu (CN) 3 2_ .
  • Sulphuric acid can be added to reduce the pH to between pH 8 and 9.5 to improve the adsorption of the cuprocyanide and precious metals onto the activated carbon.
  • the carbon loaded with copper cyanide and precious metals is then passed to a batch or semi-continuous copper elution plant 22.
  • the tailings after cyanide removal are directed to final tails disposal 24.
  • the eluted carbon is recycled along line 26 back to the cyanide adsorption circuit.
  • CuCN precipitation is achieved by adding H 2 S0 4 to lower the pH to 2 in step 28.
  • the copper can also be precipitated with H 2 S0 4 and NaSH at pH 4.5 to precipitate Cu 2 S.
  • the eluted carbon is recycled along line 24 back to the cyanide adsorption circuit 16.
  • sulphuric acid is added to the copper-cyanide solution which would lower the pH to pH 2
  • the solution is now passed via means for providing solution de-gasification (HCN removal) in a de-aeration tower to extract maximum HCN.
  • the filtrate is now neutralised to a pH above 10 and passed back via line 30 to the cyanide leach circuit 14 for further re use as free cyanide.
  • the batch or semi-continuous elution of carbon to elute the copper can be accomplished using ambient pressure and 25° to 50° centigrade temperature.
  • the solution used for elution is sodium cyanide and sodium hydroxide (caustic).
  • the use of semi-continuous elution at 21 will maximise the use of cyanide in the elution process and maximise the grade of copper in the eluate.
  • the objective is converting the copper to the trivalent ad tetra complex (Cu (CN) 3 2_ / Cu (CN 4 3 )), or to achieve a greater than 6:1 cyanide to copper ratio in the eluate.
  • the CuCN crystals from step 28 are separated from the remaining solution via pressure or vacuum filtration.
  • the CuCN precipitate can then be mixed with water and re-used in the cyanide removal process to react with the free cyanide.
  • the CuCN precipitate is then transferred to step 32 for conversion from CuCN to Cu 2 0.
  • Filtrate from pressure filtration in step 38 is used in step 32 for the reaction of approximately 75% conversion of the CuCN to Cu 2 0.
  • the NaCN filtrate from step 32 is passed via line 34 to the elution plant 22.
  • Caustic (NaOH) is fed from a supply shown at 36 to the step 38 to convert approximately 15% of the CuCN to Cu 2 0 precipitate tank 38.
  • step 40 The precipitate from step 40 where approximately 10% of the CuCN is converted to Cu 2 0 precipitate can be further processed in step 44.
  • step 44 sulphuric acid is added to dissolve the Cu 2 0 crystals and recovered as copper metal by means of electrowinning.
  • the filtrate from step 40 is transferred counter current to step 38 and the filtrate from step 38 is transferred counter current to step 32.
  • Gold and other metals is/are recovered from the carbon in conventional manner which is not described herein.
  • the invention is not limited to the precise constructional details or steps as set forth above, for example the separated CuCN crystals can be converted to Cu 2 0 crystals in more than 3 stages counter current precipitation or indeed in less than the three stages.
  • the acid addition after copper addition before adsorption can also be excluded or included in the process.
  • the process of the invention can be used for recovery of free and weak acid dissociable (WAD) cyanide where cyanide is used in the process.
  • WAD free and weak acid dissociable
  • Cyanide is typically used for gold, silver and copper 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

Un procédé de récupération de métal noble et commun à partir d'un minerai broyé qui est ajouté à un circuit de lixiviation au cyanure. La solution provenant du circuit de lixiviation est traitée avec du charbon actif qui devient chargé en métal et est distribuée à une installation d'élution où le métal est récupéré à partir du charbon. Du cuivre est ajouté à la suspension épaisse ou à la solution dans une cuve de mélange à flux ascendant pour permettre au cuivre de réagir avec le cyanure et être adsorber sur le charbon actif.
PCT/IB2021/051958 2020-03-09 2021-03-09 Procédé de récupération de métal noble et commun Ceased WO2021181275A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ZA2022/10931A ZA202210931B (en) 2020-03-09 2022-10-05 Noble and base metal recovery process where cyanide is used

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA2020/01465 2020-03-09
ZA202001465 2020-03-09

Publications (1)

Publication Number Publication Date
WO2021181275A1 true WO2021181275A1 (fr) 2021-09-16

Family

ID=75478084

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2021/051958 Ceased WO2021181275A1 (fr) 2020-03-09 2021-03-09 Procédé de récupération de métal noble et commun

Country Status (2)

Country Link
WO (1) WO2021181275A1 (fr)
ZA (1) ZA202210931B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115612857A (zh) * 2022-10-25 2023-01-17 昆明理工大学 一种选择性回收废旧电路板浸出液中金(iii)的方法
WO2023102570A1 (fr) * 2021-12-03 2023-06-08 Cyanco Corporation Procédé de conversion de cyanure de cuivre en oxyde de cuivre et système correspondant

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1178081A (en) * 1913-03-19 1916-04-04 Harai R Layng Process of cyaniding.
US4537628A (en) * 1982-12-07 1985-08-27 Ontario Research Foundation Recovery of precious metals
WO2001034856A1 (fr) * 1999-11-09 2001-05-17 Oretek Limited Recuperation de metaux precieux dans des solutions aqueuses et des suspensions epaisses
AU2012100138A4 (en) * 2012-02-09 2012-03-08 Gold Copper Solutions Pty. Ltd. Process for treating a cyanide containing solution
US8500847B2 (en) * 2010-04-27 2013-08-06 Courtney Young Method for aqueous gold thiosulfate extraction using copper-cyanide pretreated carbon adsorption
AU2012247052B2 (en) * 2007-05-18 2015-03-12 Cesl Limited Process for precious metal recovery from a sulphide ore or concentrate or other feed material
CN105734303A (zh) * 2016-03-18 2016-07-06 广州有色金属研究院 一种控制氰根离子浓度减弱浸金过程中铜溶解的方法
CN108866347A (zh) * 2018-07-06 2018-11-23 武汉工程大学 一种含铜氰化浸金液的沉铜方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1178081A (en) * 1913-03-19 1916-04-04 Harai R Layng Process of cyaniding.
US4537628A (en) * 1982-12-07 1985-08-27 Ontario Research Foundation Recovery of precious metals
WO2001034856A1 (fr) * 1999-11-09 2001-05-17 Oretek Limited Recuperation de metaux precieux dans des solutions aqueuses et des suspensions epaisses
AU2012247052B2 (en) * 2007-05-18 2015-03-12 Cesl Limited Process for precious metal recovery from a sulphide ore or concentrate or other feed material
US8500847B2 (en) * 2010-04-27 2013-08-06 Courtney Young Method for aqueous gold thiosulfate extraction using copper-cyanide pretreated carbon adsorption
AU2012100138A4 (en) * 2012-02-09 2012-03-08 Gold Copper Solutions Pty. Ltd. Process for treating a cyanide containing solution
CN105734303A (zh) * 2016-03-18 2016-07-06 广州有色金属研究院 一种控制氰根离子浓度减弱浸金过程中铜溶解的方法
CN108866347A (zh) * 2018-07-06 2018-11-23 武汉工程大学 一种含铜氰化浸金液的沉铜方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023102570A1 (fr) * 2021-12-03 2023-06-08 Cyanco Corporation Procédé de conversion de cyanure de cuivre en oxyde de cuivre et système correspondant
CN115612857A (zh) * 2022-10-25 2023-01-17 昆明理工大学 一种选择性回收废旧电路板浸出液中金(iii)的方法
CN115612857B (zh) * 2022-10-25 2023-10-20 昆明理工大学 一种选择性回收废旧电路板浸出液中金(iii)的方法

Also Published As

Publication number Publication date
ZA202210931B (en) 2023-05-31

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