【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，由小赞的店铺上传

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GlassRecyclingGlasshastheleastvolatilepricingofallthepostconsumerrecyclingcommodities.Composedofsandandpotash;bo

ttleglassismadefromreadilyavailableandinexpensiverawmaterials.Tobecompetitive,recycledglassmustmaintainapric

ethatcompeteswiththeseabundantrawmaterials.Tradedasflint(clear),amber(brown),emerald(green)ormixedcolor

brokenglass.Thepricedependsonthecleanlinessandcoloroftherecycledproduct.Cleanflintcullet(anotherwordforbrokenglass)isusu

allythemostdesirableformofrecycledglassscrap.Mixedcolorbrokenglasswithceramicsorstonesmixedinitistheleastdesirablegra

deofculletbringingthelowestprice.MostRecyclerscolorsortandbreakorcrushandscreenbottlesbeforesellingtheirpr

oduct.Modern,highproductionbottlemanufacturingrequiresverycleananduniformfeedstock.Overthepastdecadethere

hasbeenagrowthintheglassbenefactionsector.Theseareintermediateprocessorsthatreceiveglassfromrecyclingprogramsandrun

itthroughaseriesofstepstoremoveanycontaminants(rocks,ceramics,metalcaps,etc.)andprovideauniformfeedstocktothebottlemanufacturers.Theseprepro

cessorprovideanexcellentmarketforrecyclingprogramsthatdonothavethevolumeorabilitytoproduceglassfordirectmilldelivery.Glassbeneficiationplantsusesop

histicatedopticalsortingmachinestoseparatetheglassintothethreecolortypes.Theymayalsox-raytheglasstodetectanyrocksorceramicswhi

charethenremoved.Magnetsandeddycurrentseparatorsareusedtoremovedmagneticandnon-magneticmetalcontaminationfromcapsandlids.Thee

ndproductisauniformlysizedloadofgroundglassthatisfreeofcontaminantsreadilyacceptablebybottlemanufacturers.Lowergradesofrecycledglassthata

retoomixedorcontaminated,maybeusedinconcreteorinroadpavingmaterialcalled"Glasshalt".Insomeareaswherethereisan

overabundanceoflowgradeglassitisusedtocoverovertherubbishinthelandfillinplaceofsand.Thisisnottrulyre

cyclinganditishopedthatbettersortingtechnologywillsoonmakethismaterialusablefornewbottles.Glassrecyclingsavesenergybecaus

erecycledglasscanbeprocessedatalowertemperaturethanblendingnewglassfromrawmaterials.Also,recycledglassisusuallyclosertothebottleplantsthantheso

urcesofpotash,themostexpensivecomponentinglassbottlesandjars.Bout32%ofenergycanbesavedbecauseofitslowmeltingpoint.Itiseasiertoman

ufacturenewglasswarefromrecycledglassthanfromrawmaterial,whichcanalsoreduceairpollutionby20%,andwaterpollutio

nby50%.