laterites - ALTA Metallurgical Services

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

DEVELOPING PROCESSES USINGSULPHURIC ACID• Pressure acid leaching (PAL) combined with atmosphericpressure agitated tank leaching (AL).• Stand-alone atmospheric pressure agitated leaching tank (AL).• Heap leaching (HL)18
PAL COMBINED WITH AL• These combine PAL for limonite with AL for saprolite in aparallel circuit and/or use saprolite to neutralize the residualacid from PAL.• Objectives include:– treating the whole orebody– reducing the net acid consumption for saprolite– eliminating or reducing the limestone needed to neutralize residualacid from limonite PAL– reducing capital cost.• It has been piloted by a number of companies as far back asAMAX and Nical in the 1970s, but not yet commercializedwith the exception of EPAL.19
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 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 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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