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钾长石-氯化钙焙烧提钾过程研究(英文).docx

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钾长石-氯化钙焙烧提钾过程研究(英文) ResearchontheProcessofPotassiumExtractionfromPotassiumFeldsparbyCalciumChlorideRoasting Abstract Potassiumfeldsparisoneofthemostabundantmineralsonearththatcontainsimportantpotassiumresources.Thisstudyfocusesontheextractionofpotassiumfrompotassiumfeldsparthroughtheroastingprocesswithcalciumchloride.Theeffectsoftemperatureandtimeontheextractionefficiencywereinvestigated.Theresultsoftheexperimentsshowthatthetemperatureandtimehavesignificanteffectsontheextractionofpotassium.Theoptimaltemperatureandtimeforthepotassiumextractionprocessweredeterminedtobe800℃and120minutes,respectively.Undertheseconditions,theextractionefficiencyofpotassiumcouldreach80.9%.Furthermore,themechanismofpotassiumextractionfrompotassiumfeldsparbycalciumchlorideroastingwasanalyzedanditwasfoundthatthereactionfollowsatwo-stagemechanism.Finally,somesuggestionswereprovidedtoimprovetheextractionefficiencyofpotassiumfrompotassiumfeldspar. Keywords:potassiumfeldspar,roastingprocess,calciumchloride,extractionefficiency,mechanism Introduction Potassiumisoneofthemaincomponentsoffertilizers,andpotassiumfeldsparisoneofthemostabundantmineralsthatcontainsimportantpotassiumresources.Theworldwidedemandforpotassiumfertilizershasbeenrisingrapidlyinrecentyearsduetotheincreaseinglobalpopulationandcontinuousexpansionofagriculturalactivities.Althoughpotassiumiswidelydistributedintheearth'scrust,mostofitexistsintheformofinsolubleminerals,makingitdifficulttoextract.Therefore,thedevelopmentofefficientmethodsfortheextractionofpotassiumfrompotassiumfeldsparisofgreatsignificance. Severalmethodshavebeenproposedfortheextractionofpotassiumfrompotassiumfeldspar,suchasacidleaching,alkalifusion,electrostaticseparation,andthermaltreatment.Amongthesemethods,roastingwithcalciumchlorideisoneofthemostpromisingandefficientmethods.Calciumchlorideisacommonlyusedroastingagentduetoitshighsolubilityandlowcost.Inaddition,itcanreactwithfeldspartoformsolublecalciumsilicateandpotassiumchloride.Thelattercanbeeasilyseparatedfromt