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
  • C22B3/44—Treatment or purification of solutions, e.g. obtained by leaching by chemical processes
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
  • C01G49/00—Compounds of iron
  • C01G49/02—Oxides; Hydroxides
• • 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
  • C22B23/00—Obtaining nickel or cobalt
  • C22B23/04—Obtaining nickel or cobalt by wet processes
  • C22B23/0453—Treatment or purification of solutions, e.g. obtained by leaching
  • C22B23/0461—Treatment or purification of solutions, e.g. obtained by leaching by chemical methods
• • 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 the precipitation of iron with lime and/or limestone from leach solutions.
• Iron removal from leach solutions is important for the recovery of metals and for process economics. Iron is normally removed from the solution as jarosite, goethite or hematite but can also be precipitated out of the leach solution as hydroxide by precipitation with a suitable pH adjuster such as lime, limestone, magnesium hydroxide, caustic or ammonia etc. Main problems with this method ariose from the fact that iron hydroxide precipitated in this way presents difficulties in filtering so that an unacceptable amount of metallic values is lost in the filter cake.
• the object of the invention is to provide a method for efficient removal of iron as iron hydroxide/oxide from leach solutions containing other metals resulting from leaching of metal bearing materials with acids.
• the advantages with the method according to the invention include that the method can be performed at atmospheric pressure and at temperatures from ambient to boiling temperatures and that no gases are emitted. Another important advantage is, by prevention of gel formation of the iron precipitate, that solid/liquid separation becomes much easier and loss of valuable metals is minimized.
• the present invention relates to a process for efficent precipitaion of iron from leach solutions.
• metal used herein and in the appended claims encompasses nickel, cobalt and any other metals that are normally soluble in acids.
• the method is preferably performed in vessels made from stainless steel or mild steel or concrete tanks which could be lined with proper protective lining.
• a leach solution obtained from leaching of a nickel laterite ore was used.
• the pH of the process leach solution (PLS) was 0.2 and contained 82.000 ppm Fe, 4500 ppm Ni.
• the solution contained less than 1 ppm iron and aluminium.
• the thickener underflow was also filtered easily and precipitate was washed with water to remove any metallic values.
• This iron oxide/hydroxite/gypsum cake was found to contain less than 0.02% confirming a nickel loss, in the iron precipitate, of less than 5%.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Organic Chemistry (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Manufacturing & Machinery (AREA)
• Materials Engineering (AREA)
• General Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Environmental & Geological Engineering (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geochemistry & Mineralogy (AREA)
• Geology (AREA)
• Inorganic Chemistry (AREA)
• Manufacture And Refinement Of Metals (AREA)
• Compounds Of Iron (AREA)
• Inorganic Compounds Of Heavy Metals (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=47628015

Family Applications (2)

Family Applications Before (1)

Country Status (7)

Families Citing this family (1)

Family Cites Families (5)

• 2013
  • 2013-01-25 EP EP13152731.9A patent/EP2759610B1/fr active Active
• 2014
  • 2014-01-24 BR BR112015017764A patent/BR112015017764A2/pt not_active Application Discontinuation
  • 2014-01-24 US US14/763,625 patent/US20150353375A1/en not_active Abandoned
  • 2014-01-24 WO PCT/EP2014/051409 patent/WO2014114752A1/fr active Application Filing
  • 2014-01-24 AU AU2014209913A patent/AU2014209913B2/en not_active Ceased
  • 2014-01-24 AU AU2014209919A patent/AU2014209919B2/en not_active Ceased
  • 2014-01-24 BR BR112015017910A patent/BR112015017910A2/pt not_active Application Discontinuation
  • 2014-01-24 WO PCT/EP2014/051399 patent/WO2014114746A1/fr active Application Filing
  • 2014-01-24 US US14/763,759 patent/US20150361522A1/en not_active Abandoned
  • 2014-01-24 CA CA2899270A patent/CA2899270C/fr not_active Expired - Fee Related
  • 2014-01-24 CA CA2899132A patent/CA2899132A1/fr not_active Abandoned
• 2015
  • 2015-07-29 ZA ZA2015/05456A patent/ZA201505456B/en unknown

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