laterites - ALTA Metallurgical Services

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

ADVANTAGES OF SULPHURIC ACID BASEDLEACHING PROCESSES• Key advantages of sulphuric acid for leaching <strong>laterites</strong> include:• It is the best known and most widely applied leaching reagentin the mining and metallurgical industry.• it is widely available at moderate cost.• It is commonly produced in the same industry – e.g. smelters.• On-site production yields very useful energy.• Intermediate products can be produced which significantlyreduces cost and simplifies operation.28
ISSUES WITH SULPHURIC ACID BASEDPROCESSES• Downstream processing is typically complex and is a majorcomponent of overall capital cost, especially if separate nickeland cobalt products are produced at site.• The leach solution is generally dilute with regard to nickel andcobalt, which adversely affects capital and operating costs.• The acid not regenerated and recycled.29
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 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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