laterites - ALTA Metallurgical Services

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$developments in the processing of refractory & complex gold ores$

SUMMARY OF PRESENT STATUS FORPROCESSING OF LOW GRADE LATERITES• PAL dominates for recent projects. No recent Caron plantshave been built.• AL is being pursued for a number of projects, but there are nostand-alone operations as yet.• HL is still being pursued, though Interest has waned, andthere are no stand-alone operations as yet.• A number of chloride leaching processes are being developed,but there are no operations as yet.• A nitric acid leaching system is being developed by DirectNickel, but there is no commercial plant as yet.38
THE IDEAL LATERITE PROCESS• High recoveries of nickel and cobalt.• Lower capex and opex than existing processes• No initial drying and low overall energy requirement.• Atmospheric pressure operation.• Low net reagent consumption.• Straight forward downstream processing.• Ability to provide separate nickel and cobalt products.• Potential for saleable by-products.• Suitable for large and small projects.• Low to moderate corrosivity.• Low short and long term environmental impact.39
Page 1: LATERITES - STILL A FRONTIER OFNICK
Page 4 and 5: CARON PROCESS• It is not a new pr
Page 6 and 7: CURRENT CARON INSTALLATIONSPlant St
Page 8 and 9: ISSUES WITH CARON FLOWSHEET• It h
Page 10 and 11: PAL PROCESS (cont.)• Since then,
Page 12 and 13: CURRENT PAL INSTALLATIONS(Excluding
Page 14 and 15: ISSUES WITH PAL PROCESS• The capi
Page 16 and 17: EPAL PROCESS FLOWSHEET(Ref: Ravenst
Page 18 and 19: DEVELOPING PROCESSES USINGSULPHURIC
Page 20 and 21: STANDALONE AL• Standalone AL has
Page 22 and 23: ISSUES WITH AL• It generally has
Page 24 and 25: CALDAG HL DEMONSTRATION PLANT(Ref:
Page 26 and 27: ISSUES WITH HL• Laterites frequen
Page 28 and 29: ADVANTAGES OF SULPHURIC ACID BASEDL
Page 30 and 31: DEVELOPING PROCESSES USING CHLORIDE
Page 32 and 33: NEOMET PROCESS FLOWSHEET(Ref: Neome
Page 34 and 35: DEVELOPING PROCESSES USING NITRICLE
Page 36 and 37: DNi PROCESS FLOWSHEET(Ref: Direct N
Page 40 and 41: The field is still wide openThere i

laterites - ALTA Metallurgical Services

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