【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，由管理员店铺上传

转载请保留链接：https://www.doc5u.com/view-ae3c990aba15d53c1cdf2ae5f555e99b.html

以下为本文档部分文字说明：

GlassRecyclingGlasshastheleastvolatilepricingofallthepostconsumerrecyclingcommodities.Composedofsandandpotash;bottleglassismadefromreadilyavailab

leandinexpensiverawmaterials.Tobecompetitive,recycledglassmustmaintainapricethatcompeteswiththeseabund

antrawmaterials.Tradedasflint(clear),amber(brown),emerald(green)ormixedcolorbrokenglass.Thepricedependsonthecleanlinessandcoloroftherecycledprod

uct.Cleanflintcullet(anotherwordforbrokenglass)isusuallythemostdesirableformofrecycledglassscrap.Mixedcolorbrokengla

sswithceramicsorstonesmixedinitistheleastdesirablegradeofculletbringingthelowestprice.MostRecyclerscolorsortandbreakorcru

shandscreenbottlesbeforesellingtheirproduct.Modern,highproductionbottlemanufacturingrequiresverycleanandunifor

mfeedstock.Overthepastdecadetherehasbeenagrowthintheglassbenefactionsector.Theseareintermediateprocessorsthatreceiveglassfromrecy

clingprogramsandrunitthroughaseriesofstepstoremoveanycontaminants(rocks,ceramics,metalcaps,etc.)andprovideauniformfeedstocktothebottlemanufact

urers.Thesepreprocessorprovideanexcellentmarketforrecyclingprogramsthatdonothavethevolumeorabilitytoproduceglassfordirectmilldelivery.Glassbe

neficiationplantsusesophisticatedopticalsortingmachinestoseparatetheglassintothethreecolortypes.Theymayalsox-raytheglasstodetect

anyrocksorceramicswhicharethenremoved.Magnetsandeddycurrentseparatorsareusedtoremovedmagneticandnon-magneticmetalcontaminatio

nfromcapsandlids.Theendproductisauniformlysizedloadofgroundglassthatisfreeofcontaminantsreadilyaccep

tablebybottlemanufacturers.Lowergradesofrecycledglassthataretoomixedorcontaminated,maybeusedinconcreteorinroadpavingmateria

lcalled"Glasshalt".Insomeareaswherethereisanoverabundanceoflowgradeglassitisusedtocoverovertherubbishinthelandfillinplaceofsand.Thisisnottrulyrecycl

inganditishopedthatbettersortingtechnologywillsoonmakethismaterialusablefornewbottles.Glassrecyclingsavesenergyb

ecauserecycledglasscanbeprocessedatalowertemperaturethanblendingnewglassfromrawmaterials.Also,recycledglassisusuallyclosertothebo

ttleplantsthanthesourcesofpotash,themostexpensivecomponentinglassbottlesandjars.Bout32%ofenergycanbesavedbecau

seofitslowmeltingpoint.Itiseasiertomanufacturenewglasswarefromrecycledglassthanfromrawmaterial,whichcanalsoreduceairpolluti

onby20%,andwaterpollutionby50%.