【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 .docx，共(2)页，15.492 KB，由小赞的店铺上传

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GlassRecyclingGlasshastheleastvolatilepricingofallthepostconsumerrecyclingcommodities.Composedofsandandpotash;bottleglassismadefromreadilyavail

ableandinexpensiverawmaterials.Tobecompetitive,recycledglassmustmaintainapricethatcompeteswiththeseabundantrawmaterials.Tradedasflint(clear),am

ber(brown),emerald(green)ormixedcolorbrokenglass.Thepricedependsonthecleanlinessandcoloroftherecycledproduct.Cleanflintcullet(anotherwordforbro

kenglass)isusuallythemostdesirableformofrecycledglassscrap.Mixedcolorbrokenglasswithceramicsorstonesmixedinitistheleastdesirablegradeofculletbringi

ngthelowestprice.MostRecyclerscolorsortandbreakorcrushandscreenbottlesbeforesellingtheirproduct.Modern,highproductionbottle

manufacturingrequiresverycleananduniformfeedstock.Overthepastdecadetherehasbeenagrowthintheglassbenefactionsector.Theseareintermed

iateprocessorsthatreceiveglassfromrecyclingprogramsandrunitthroughaseriesofstepstoremoveanycontaminants(rocks,ceramics,metalcaps,etc.)andpr

ovideauniformfeedstocktothebottlemanufacturers.Thesepreprocessorprovideanexcellentmarketforrecyclingprogramsthatdonothavethevolumeorabili

tytoproduceglassfordirectmilldelivery.Glassbeneficiationplantsusesophisticatedopticalsortingmachinestoseparatetheglassintothethreecolort

ypes.Theymayalsox-raytheglasstodetectanyrocksorceramicswhicharethenremoved.Magnetsandeddycurrentseparatorsareusedtoremovedmagneticandnon-ma

gneticmetalcontaminationfromcapsandlids.Theendproductisauniformlysizedloadofgroundglassthatisfreeofcontaminantsreadilyacceptablebybottlemanufactu

rers.Lowergradesofrecycledglassthataretoomixedorcontaminated,maybeusedinconcreteorinroadpavingmaterialcalled"Glasshalt".Insomeareaswherethereis

anoverabundanceoflowgradeglassitisusedtocoverovertherubbishinthelandfillinplaceofsand.Thisisnottrulyrecyclinganditishopedthatbettersortingtec

hnologywillsoonmakethismaterialusablefornewbottles.Glassrecyclingsavesenergybecauserecycledglasscanbep

rocessedatalowertemperaturethanblendingnewglassfromrawmaterials.Also,recycledglassisusuallyclosertothebottleplantsthanthesourcesofpotash,themoste

xpensivecomponentinglassbottlesandjars.Bout32%ofenergycanbesavedbecauseofitslowmeltingpoint.Itiseasiertomanufacturen

ewglasswarefromrecycledglassthanfromrawmaterial,whichcanalsoreduceairpollutionby20%,andwaterpollutionby50%.