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时间:2020-03-23
《垃圾焚烧飞灰水洗-酸浸稳定化技术研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、vo1.20,No.2第2O卷第2期中国矿业2Ol1年2月CHINAMININGMAGAZINEFeb.2O11垃圾焚烧飞灰水洗一酸浸稳定化技术研究2于昕,薛’一(1.北京科技大学土木与环境工程学院,北京100083;2.环境保护部固体废物管理中心,北京100029)摘要:垃圾焚烧飞灰中富集了浓度较高的重金属,对环境存在潜在威胁,但同时具有一定的回收价值。对水洗一酸浸稳定化技术处理城市垃圾焚烧飞灰的效果进行了实验室研究,分析了垃圾焚烧飞灰的主要化学组成,考察了水洗过程对于飞灰中主要元素和重金属去除的影响、水洗过程中的化学组成变化和飞灰重金属酸浸的效果,评价了水洗飞灰酸浸残渣
2、的稳定性。结果表明:L/S一20时,水洗过程可以浸出6O%以上的cl,47以上的Na、K、Ca,18以上的Pb。水洗后,重金属Zn、Pb、Cu含量分别增加76.37、21.91和46.16。与原灰相比,水洗飞灰酸浸过程中的Zn浸出量也有很大提高,而Pb浸出量的增加很小。当HC1浓度3、的环境安全。关键词:垃圾焚烧;飞灰;重金属;连续提取中图分类号:X705文献标识码:B文章编号:1004—4051(2011)02—0118一O6Effectsofawater—washingprocessonheavymetalspeciationandleachingefficiencyinMSWIflyashduringacidextractionYUXin,XUEJun。(1.CivilandEnvironmentEngineeringSchool,UniversityofScienceandTechnologyBeijing,Beijing100083,China4、;2.SolidWasteManagementCenteroftheMinistryofEnvironmentalofChina,Beijing100029,China)Abstract:Flyashfrommunicipalwasteincineratorsformamajorenvironmentalproblemastheyarepollutedwithheavymetals.Butthemetalvaluecanbepartlyremovedandrecoveredbyextractingwithacidsolution.Experimentshavebeenper5、formedtoinvestigatetheeffectofwaterwashing—acidextractionprocess(WWAEprocess)fortreatmentofMSWIflyash.Thechemicalcompositionofflyashhasbeenanalyzed.Theeffectsofwater-washingprocessontheremovalofthemajorelementsandonheavymetals,theirspeci—ationinthewashingprocess,theeffectsofacidextractionh6、avebeenelucidatedandheavymetalsstabilityintheextractedwashedashresidualshavebeenevaluated.Theresultsindicatethatmorethan60oftheCl,andmorethan47ofthemajorelementsofNa,K,andCa,aswellasmorethan18ofthePb,werefoundtobeleachedatL/S=20.Thewashingprocessresultedinmoreconcentratedheavymetalcontenti7、nthewashedflyash.Acomparisonoftheresultsofacidextractionofrawashandwashedflyashdemonstra—tedthatincrementofextractedamountofZnimprovedevidentlyafterwashing,whilePbimprovedindistinc—tively.Leachingwithmoreconcentratedacidyieldedgreaterheavymetalcontentfromwashe
3、的环境安全。关键词:垃圾焚烧;飞灰;重金属;连续提取中图分类号:X705文献标识码:B文章编号:1004—4051(2011)02—0118一O6Effectsofawater—washingprocessonheavymetalspeciationandleachingefficiencyinMSWIflyashduringacidextractionYUXin,XUEJun。(1.CivilandEnvironmentEngineeringSchool,UniversityofScienceandTechnologyBeijing,Beijing100083,China
4、;2.SolidWasteManagementCenteroftheMinistryofEnvironmentalofChina,Beijing100029,China)Abstract:Flyashfrommunicipalwasteincineratorsformamajorenvironmentalproblemastheyarepollutedwithheavymetals.Butthemetalvaluecanbepartlyremovedandrecoveredbyextractingwithacidsolution.Experimentshavebeenper
5、formedtoinvestigatetheeffectofwaterwashing—acidextractionprocess(WWAEprocess)fortreatmentofMSWIflyash.Thechemicalcompositionofflyashhasbeenanalyzed.Theeffectsofwater-washingprocessontheremovalofthemajorelementsandonheavymetals,theirspeci—ationinthewashingprocess,theeffectsofacidextractionh
6、avebeenelucidatedandheavymetalsstabilityintheextractedwashedashresidualshavebeenevaluated.Theresultsindicatethatmorethan60oftheCl,andmorethan47ofthemajorelementsofNa,K,andCa,aswellasmorethan18ofthePb,werefoundtobeleachedatL/S=20.Thewashingprocessresultedinmoreconcentratedheavymetalcontenti
7、nthewashedflyash.Acomparisonoftheresultsofacidextractionofrawashandwashedflyashdemonstra—tedthatincrementofextractedamountofZnimprovedevidentlyafterwashing,whilePbimprovedindistinc—tively.Leachingwithmoreconcentratedacidyieldedgreaterheavymetalcontentfromwashe
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