JournalofHazardousMaterials146(2007)255–261CharacterizationofredmudderivedfromacombinedBayerProcessandbauxitecalcinationmethod(从结合拜耳法和铝矾土煅烧法中得出赤泥的表征)YongLiua,ChuxiaLina,b,,YongguiWuaaCollegeofResourcesandEnvironment,SouthChinaAgriculturalUniversity,Guangzhou510642,ChinabSchoolofEnvironmentalScienceandManagement,SouthernCrossUniversity,Lismore,NSW2480,AustraliaReceived22August2006;receivedinrevisedform23October2006;accepted9December2006Availableonline13December2006华南农业大学资源与环境学院,广州510642B环境科学与管理,南十字星大学,澳大利亚,新南威尔士州的2480所学校,澳大利亚收到了22个月2006日,收到了修订后的形式23十月2006;接受9,十二月2006可网上13十二月2006Abstract(摘要)Redmudcanbederivedfromtheprocessingofbauxiteusingdifferentmethods.ThechemicalandmineralogicalcompositionofthecombinedBayerProcessandbauxitecalcinationredmud(BPBCRM)differsmarkedlyfromthoseofthepureBayerProcessredmud(PBPRM).Inthisstudy,redmudderivedfromacombinedBayerProcessandbauxitecalcinationmethodwascharacterized.TheresultsshowthatpHoftheredmuddecreasedwithincreasingdurationofstoragetime.Nadominatedamongthesolublecations,buttheconcentrationofsolubleNadecreasedwithincreasingdurationofstoragetimeasaresultofleaching.Cationexchangecapacityalsodecreasedwithincreasingdurationofstoragetime,probablyduetoadecreaseinpHcausingareductioninnegativelychargedsitesontheredmudps.CawasthepredominantexchangeablecationinthefreshredmudbuttheconcentrationofexchangeableCamarkedlydecreasedintheoldredmud,whichwasdominatedbyexchangeableNa.Thedegreeofcrystallizationandthermalstabilityoftheredmudincreasedwithincreasingdurationofstorage.Theacidneutralizingcapacityofredmudobtainedfromthisstudywasabout10molkg−1,whichismuchgreaterthanthereportedvaluesforthepureBayerProcessredmud.ColumnfilteringexperimentindicatesthattheredmudalsohadaverystrongcapacitytoremoveCu,ZnandCdfromthefilteringsolution.ItisconservativelyestimatedthatthesimultaneousremovalratesofCd,ZnandCubyredmudareover22,250mgkg−1,22,500mgkg−1and25,000mgkg−1,respectively.Theaffinityofthesemetalstotheredmudwasinthefollowingdecreasingorder:Cu>Zn>Cd.Ingeneral,thefreshredmudretainedmoreheavymetalsthantheoldredmuddid.©2007ElsevierB.V.Allrightsreserved.(利用不同的方法,可以从铝土矿的加工中得到一种红泥。化学与结合拜耳法赤泥和铝矾土煅烧矿物成分(bpbcrm)不同明显从那些纯拜耳法赤泥(pbprm)。在这项研究中,从一个组合的拜耳法和铝的铝土矿煅烧法衍生的红泥进行了表征。结果表明,PH值随着贮藏时间的增加,红泥PH值下降。钠为主的水溶性阳离子,但可溶性钠的浓度随时间的增加而增加的存储时间作为一个研究结果浸出。阳离子交换容量也随着储存时间的增加而减少,可能是由于减少了导致负电荷的网站上的红泥的下降文章。在新鲜的红泥中,钙是主要的交换阳离子,但可交换性钠占主导地位的老红泥中交换性钙含量显著降低。的程度EE的结晶和赤泥的热稳定性随贮藏时间的延长增加。酸中和能力赤泥从这个研究中获得了约10摩尔公斤−1,这比纯拜耳法红泥的报道值要---本文来源于网络,仅供参考,勿照抄,如有侵权请联系删除---大得多。柱过滤试验表明,红泥也具有很强的去除铜、锌、镉的能力滤波方案。据保守估计,镉去除率的同时,Zn和Cu的赤泥超过22250毫克公斤−1,22500毫克公斤−1毫克和25000毫克公斤−1,分别。亲和这些金属中的红泥是在下面的递减顺序:铜>锌>镉。一般来说,新鲜的红泥保留了较旧的红泥。©2007Elsevier公司保留所有权利。)Keywords:Redmud;BayerProcess;Bauxitecalcination;Acidneutralizingcapacity;Calc...