extractive metalluregy

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1、Unit1Extractivemetalluregy1．重点副词selectively选择性地essentially本质地;基本地preferentially优先地universally普遍地subsequently随后地commonly~generally通常地respectively分别地widely广泛地particularly特别地broadly广泛地;粗略地specially特别地readily容易地especially特别地relatively比较地;相对地extremely非常地;极

2、端地tremendously非常地;惊人地◆bebroadlyclassifiedin大致地分类为……◆beessentiallyof本质上是……◆beuniversallyapplicable普遍适用的◆becommonlyproducedby通常用….方法生产◆beselectivelydissolvedfrom被选择性的从…溶解出来◆berelativelyunstable比较不稳定◆bewidelyappliedin被广泛地应用于……◆bereadilypurifiedby易于被提纯◆be

3、extremelysensitiveto对….极其敏感◆subsequentlyberecoveredby随后被用…方法提取1)Intheextractivemetallurgy,themethodoftreatmentmaybebroadlyclassifiedinpyrometallurgy,hydrometallurgyandelectrometallurgy.2)Althoughthechangetobebroughtaboutareessentiallyofachemicalnature

4、,becauseofthedifferingnatureofthecomponentsofthemineralandtheirvaryingproperties,noonemethodoftreatmentisuniversallyapplicable;henceadiversityofmethodsisused.3)Hydrometallurgy,themetalbeingselectivelydissolvedfromtheorebyanappropriateliquidsolvent,sub

5、sequentlybeingrecoveredbyadiversityofmethods.4)Mercurysulphidewithalowfreeenergyvalueisrelativelyunstable.51)Aluminiumandmagnesiumarecommonlyproducedbyacombinationofhydro-andelectrometallurgicalmethods.2)Volatilemetalssuchaszinc,mercuryandcadmiummaybe

6、readilypurifiedbythemethodofdistillation.3)Notonlythat,buttheyareextremelysensitivetocontaminationbyoxygenandnitrogenoftheair.2、重点形容词preliminary初步的particular特殊的differing不同的varying变化的appropriate合适的suitable合适的deciding/key关键的，决定性的extreme极端的steady稳定的major

7、主要的immediate直接的，立即的◆apreliminarystage一个初步的阶段◆thevaryingproperties变化的性质◆thedifferingnature不同的性质◆byaappropriate/suitableliquidsolvent◆particularmineralconcentrate特殊的矿物精矿◆thedeciding/keyfactor决定性/关键因素◆beofextremeimportance极其重要◆asteadysupplyof稳定的供给◆themaj

8、ornon-ferrousmetals主要的有色金属◆bytheimmediatetreatmentof通过直接处理3、重点动词及词组◆embrace/encompass/include/involve/cover/consistof包括，由…构成1)Itembracestheoccurrenceofmetals,oreconcentration,extractionandrefiningofmetals,andendswithfinalcastingofthemetalingot