【文档说明】四川省成都七中高一英语外研版必修四素材（文章）Module 1 Glass Recycling .doc，共(2)页，24.000 KB，由管理员店铺上传

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GlassRecyclingGlasshastheleastvolatilepricingofallthepostconsumerrecyclingcommodities.Composedofsandandpotash;bottleglassismadefromread

ilyavailableandinexpensiverawmaterials.Tobecompetitive,recycledglassmustmaintainapricethatcompeteswiththeseabundantr

awmaterials.Tradedasflint(clear),amber(brown),emerald(green)ormixedcolorbrokenglass.Thepricedependsonthecleanlinessandcoloroftherecycledproduct.

Cleanflintcullet(anotherwordforbrokenglass)isusuallythemostdesirableformofrecycledglassscrap.Mixedcolorbrokenglasswithceramicso

rstonesmixedinitistheleastdesirablegradeofculletbringingthelowestprice.MostRecyclerscolorsortandbreakorcrushandscreenbottlesbeforeselling

theirproduct.Modern,highproductionbottlemanufacturingrequiresverycleananduniformfeedstock.Overthepastdecadetherehasbeenagrowthintheglass

benefactionsector.Theseareintermediateprocessorsthatreceiveglassfromrecyclingprogramsandrunitthroughaseriesofstepstoremoveanycontaminants(

rocks,ceramics,metalcaps,etc.)andprovideauniformfeedstocktothebottlemanufacturers.Thesepreprocessorprovideanexcellentmarketfor

recyclingprogramsthatdonothavethevolumeorabilitytoproduceglassfordirectmilldelivery.Glassbeneficiationplantsusesophisticatedopt

icalsortingmachinestoseparatetheglassintothethreecolortypes.Theymayalsox-raytheglasstodetectanyrocksorceramicswhicharethenremoved.Magnetsandeddycurr

entseparatorsareusedtoremovedmagneticandnon-magneticmetalcontaminationfromcapsandlids.Theendproductisauniform

lysizedloadofgroundglassthatisfreeofcontaminantsreadilyacceptablebybottlemanufacturers.Lowergradesofrecycledglassthataretoomixed

orcontaminated,maybeusedinconcreteorinroadpavingmaterialcalled"Glasshalt".Insomeareaswherethereisanoverabund

anceoflowgradeglassitisusedtocoverovertherubbishinthelandfillinplaceofsand.Thisisnottrulyrecyclinganditishopedtha

tbettersortingtechnologywillsoonmakethismaterialusablefornewbottles.Glassrecyclingsavesenergybecauserecycledglasscanbeprocessedatalowertemperature

thanblendingnewglassfromrawmaterials.Also,recycledglassisusuallyclosertothebottleplantsthanthesourcesof

potash,themostexpensivecomponentinglassbottlesandjars.Bout32%ofenergycanbesavedbecauseofitslowmeltingpoint

.Itiseasiertomanufacturenewglasswarefromrecycledglassthanfromrawmaterial,whichcanalsoreduceairpollutionby20%,andwaterpollutionby50%.