【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.Composedofsandandpota

sh;bottleglassismadefromreadilyavailableandinexpensiverawmaterials.Tobecompetitive,recycledglassmustmain

tainapricethatcompeteswiththeseabundantrawmaterials.Tradedasflint(clear),amber(brown),emerald(green)ormixedcolorbrokenglass.Thepricedep

endsonthecleanlinessandcoloroftherecycledproduct.Cleanflintcullet(anotherwordforbrokenglass)isusuallythemostdesir

ableformofrecycledglassscrap.Mixedcolorbrokenglasswithceramicsorstonesmixedinitistheleastdesirablegradeof

culletbringingthelowestprice.MostRecyclerscolorsortandbreakorcrushandscreenbottlesbeforesellingtheirproduct.

Modern,highproductionbottlemanufacturingrequiresverycleananduniformfeedstock.Overthepastdecadetherehasbeenagro

wthintheglassbenefactionsector.Theseareintermediateprocessorsthatreceiveglassfromrecyclingprogramsandrunitthroughaseriesofstepstoremoveanycont

aminants(rocks,ceramics,metalcaps,etc.)andprovideauniformfeedstocktothebottlemanufacturers.Thesepreprocessorprovideanexcellentmarketforrec

yclingprogramsthatdonothavethevolumeorabilitytoproduceglassfordirectmilldelivery.Glassbeneficiationplantsusesophisticatedopticalsortingmachin

estoseparatetheglassintothethreecolortypes.Theymayalsox-raytheglasstodetectanyrocksorceramicswhicharethenremoved.Magnetsan

deddycurrentseparatorsareusedtoremovedmagneticandnon-magneticmetalcontaminationfromcapsandlids.Theendproductisaun

iformlysizedloadofgroundglassthatisfreeofcontaminantsreadilyacceptablebybottlemanufacturers.Lowergradesofrecycledglassthataretoomixedorcontam

inated,maybeusedinconcreteorinroadpavingmaterialcalled"Glasshalt".Insomeareaswherethereisanoverabundanceoflowgradegla

ssitisusedtocoverovertherubbishinthelandfillinplaceofsand.Thisisnottrulyrecyclinganditishopedthatbettersortingtechnologywillsoonmakethismaterialusabl

efornewbottles.Glassrecyclingsavesenergybecauserecycledglasscanbeprocessedatalowertemperaturethanblendingnewglassfromrawmaterials.Also,recycledgla

ssisusuallyclosertothebottleplantsthanthesourcesofpotash,themostexpensivecomponentinglassbottlesandjars.Bout32%ofenergycanbesavedbeca

useofitslowmeltingpoint.Itiseasiertomanufacturenewglasswarefromrecycledglassthanfromrawmaterial,whichcanalsoreduceairpollutionby20%,andw

aterpollutionby50%.