奥托昆普哈加瓦尔塔镍加压浸出流程 (1)

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1、NEWNICKELPROCESSINCREASINGPRODUCTIONATOUTOKUMPUHARJAVALTAMETALSOY,FINLANDTABLEOFCONTENTS1.0Introduction22.0NickelSmelter33.0Nicke!Refinery54.0Conclusions18PresentedatALTA1997Nickel/CobaltPressureLeaching&HydrometallurgyForum,May19-20,1997,PerthAusffalia1.0INT

2、RODUCTIONOutokumpuOyhasproducednickelatHarjavaltaWorksinFinlandsince1960.Theproductionhasbeenbasedonflashsmeltingtechnologyandelectrowinningofnickel.Thecapacityoftheprocesshasbeenincreasedgraduallyto18000tpabyseveralsmallexpansionsandprocessimprovements.Thepr

3、oductionreliedondomesticnickelconcentratesuntilthaAttheturnofthe1990sanewnickelstrategywasdevelopedandOutokumpustartednickelexplorationinAustraiiaandCanada.TheworksecuredlongtermdeliverycontractsofnickelconcentratesfromMt.KeithandstartingofminingoperationsatF

4、orrestaniaandSilverSwaninAustralia.AtthesametimeOutokumpustudieddifferentalterativestoexpandthenickelandcopperproduction.n1993,adecisionwasmadetoinvestintheexpansionandmodernisationofHarjavaltaoperations.Outokumpudecidedtoincreasenickelproductionfrom18000tpat

5、o32000tpaandblistercopperproductionfrom100000tpato160000tpa.ThecopperrefineryinPoriwasexpandedfrom72000tpato125000tpa.Inaddition,theexpansionincludedanewoxygenplant,twohydrogenplantsandanewsulphuricacidplant.Theconstructionstartadin1993andtheHarjavaltaproject

6、wascompletedin1996.Duringtheconstructionthenickelproductionwasdecidedtoincreasefurtherto40000tpa.TherealisedcapitalexpenditureofthewholeexpansionprojectofHarjavaltawasFIM1600million($US370million).Theexpansionofthenickelproductionhasmeantseveralprocesschanges

7、inthanickelsmelterandrefinery.ThedecisiontoinvestinnickelwasprecededbyresearchanddevelopmentworkatOutokumpuHarjavaltaMatalsOyandatOutokumpuRasaarchOy.Theinvestigationprogramledtothefollowingimprovementsoftheprocess:DevelopmentofdirectOutokumpuNickelSmelting(D

8、ON)Process.LeachingprocessforhighironnickelmatteUtilizationofOutokumpu-developedanddesignedreactorsforatmosphericandpressureleaching.UtilizationofOutokumpu-developedsolventextractionproce