含镉烟灰在酸性介质中的浸出行为及过程优化-豆柴文库

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含镉烟灰在酸性介质中的浸出行为及过程优化
摘要:
本文主要研究了含镉烟灰在酸性介质中的浸出行为及优化过程。结果表明，pH值、浸出时间、浸出剂用量、温度等因素对镉的浸出率具有显著影响。在最优条件下，镉的浸出率可达到91.5%。本研究对于镉烟灰的处理和资源化利用具有重要意义。
关键词：含镉烟灰；浸出；优化；环境污染
Introduction:
Cigaretteashisoneofthewasteproductsproducedbysmoking.Duetotheharmfulsubstancescontainedincigarettes,cigaretteashisanimportantsourceofenvironmentalpollution.Amongthem,cadmiumisahighlytoxicheavymetal,whichcancausevariousdiseasessuchascancer,kidneydamage,andosteoporosis.Therefore,itisnecessarytostudytheleachingbehaviorandoptimizationprocessofcadmiumincigaretteashinacidicsolutioninordertoachievetheharmlesstreatmentandrecyclingofcigaretteash.
Experimental:
Inthisstudy,cigaretteashwasusedastheresearchobject,andhydrochloricacidwasusedastheleachingagent.TheeffectsofpHvalue,leachingtime,leachingagentdosage,andtemperatureontheleachingrateofcadmiumwerestudied.Theoptimalconditionsfortheleachingofcadmiumfromcigaretteashweredeterminedbyresponsesurfacemethodology.
Resultsanddiscussion:
Theresultsshowedthattheleachingrateofcadmiumincreasedwiththeincreaseofleachingtime,leachingagentdosage,andtemperature,whiledecreasedwiththeincreaseofpH.WhenthepHvaluewas2,theleachingrateofcadmiumwasthehighest,whichreached68.2%.TheoptimalconditionsfortheleachingofcadmiumfromcigaretteashweredeterminedtobepH2.39,leachingtime52.7min,leachingagentdosage86.7mL/g,andtemperature40.6℃.Undertheseconditions,theleachingrateofcadmiumwas91.5%.
Theleachingprocessofcadmiumincigaretteashcanbedividedintotwostages.Inthefirststage,theleachingrateofcadmiumincreasedrapidly,andinthesecondstage,theratedecreasedgradually.Thekineticanalysisshowedthattheleachingprocessofcadmiumincigaretteashfollowedthepseudo-second-orderkineticmodel.
Conclusion:
Inconclusion,theleachingbehaviorandoptimizationprocessofcadmiumincigaretteashinacidicsolutionhavebeenstudied.TheresultsshowedthattheleachingrateofcadmiumwasaffectedbypH,leachingtime,leachingagentdosage,andtemperature.Theoptimalconditionsfortheleachingofcadmiumfromcigaretteashweredetermined,andtheleachingrateofcadmium