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时间:2018-12-15
《高中英语《module 1 life in the future 第5课时》学案 外研版必修4》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、Period5:CulturalCorner学习目标:1.了解人们对未来世界的种种预测2.树立跨文化交际意识3.掌握重点句子的用法学习重点:了解人们对未来世界的种种预测学习难点:掌握重点句子的用法课前预习使用说明与学法指导:1.树立跨文化交际意识2.15分钟之内完成教材助读:GlassRecyclingGlasshastheleastvolatilepricingofallthepostconsumerrecyclingcommodities.Composedofsandandpotash;bottleglassismadefromreadilyavailableandinex
2、pensiverawmaterials.Tobecompetitive,recycledglassmustmaintainapricethatcompeteswiththeseabundantrawmaterials.Tradedasflint(clear),amber(brown),emerald(green)ormixedcolorbrokenglass.Thepricedependsonthecleanlinessandcoloroftherecycledproduct.Cleanflintcullet(anotherwordforbrokenglass)isusuall
3、ythemostdesirableformofrecycledglassscrap.Mixedcolorbrokenglasswithceramicsorstonesmixedinitistheleastdesirablegradeofculletbringingthelowestprice.MostRecyclerscolorsortandbreakorcrushandscreenbottlesbeforesellingtheirproduct.Modern,highproductionbottlemanufacturingrequiresverycleanandunifor
4、mfeedstock.Overthepastdecadetherehasbeenagrowthintheglassbenefactionsector.Theseareintermediateprocessorsthatreceiveglassfromrecyclingprogramsandrunitthroughaseriesofstepstoremoveanycontaminants(rocks,ceramics,metalcaps,etc.)andprovideauniformfeedstocktothebottlemanufacturers.Thesepreprocess
5、orprovideanexcellentmarketforrecyclingprogramsthatdonothavethevolumeorabilitytoproduceglassfordirectmilldelivery.Glassbeneficiationplantsusesophisticatedopticalsortingmachinestoseparatetheglassintothethreecolortypes.Theymayalsox-raytheglasstodetectanyrocksorceramicswhicharethenremoved.Magnet
6、sandeddycurrentseparatorsareusedtoremovedmagneticandnon-magneticmetalcontaminationfromcapsandlids.Theendproductisauniformlysizedloadofgroundglassthatisfreeofcontaminantsreadilyacceptablebybottlemanufacturers.Lowergradesofrecycledglassthataretoomixedorcontaminated,maybeusedinconcreteorinroadp
7、avingmaterialcalled"Glasshalt".Insomeareaswherethereisanoverabundanceoflowgradeglassitisusedtocoverovertherubbishinthelandfillinplaceofsand.Thisisnottrulyrecyclinganditishopedthatbettersortingtechnologywillsoonmakethismaterialusablefornewbottles.Gl
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