laterites - ALTA Metallurgical Services

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

ISSUES WITH HL• Laterites frequently have a high fines content andagglomeration with a polymer is typically required.• Heap stability is a problem, especially in high rainfall locations.High rainfall can also cause breakdown of agglomerates andcause dilution of the leach solution.• It generally has a high acid consumption, especially forsaprolite ore, leading to higher operating cost which offsetsthe saving in capital cost versus PAL.• It typically produces higher levels of iron and other impuritiesin the leach solution than PAL, which makes downstreamprocessing more difficult.26
ISSUES WITH HL (Cont.)• Heap leaching of limonite ore typically yields low recoveries.• Decommissioning can be challenging especially at highrainfall sites.• Environmental issues can be greater that for PAL or AL.27
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 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 38 and 39: SUMMARY OF PRESENT STATUS FORPROCES
Page 40 and 41: The field is still wide openThere i

laterites - ALTA Metallurgical Services

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