week2lecturenotes - Metal, Glass and Wood Metal Another...

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1 Metal, Glass and Wood Metal • Another major component of the waste stream is metal • Metal as a raw material is energy and waste intensive to obtain, so recycle of many metals is also good economics • Divided into two main stream ferrous (iron and steel) and non-ferrous (like aluminum) Metal • Most metals are obtained from mining, smelting and processing. • This produces large amounts of pollutants both solid, liquid and gas, and many dangerous chemicals (this will be discussed more under industrial waste) • Metal is also a finite resource that must be found through various types of prospecting
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2 Metal • Metals cannot be incinerated (under normal conditions), so options include landfills or recycling • Because of the economic value of metals recycling is the preferred method. • Everything from old cans (aluminum is quite valuable) to old cars can be broken down, melted and reused. Ferrous recycling • Iron and steel, because of the economics are the most recycled material in the world • Easy to separate magnetically from other
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This note was uploaded on 10/20/2010 for the course NATS Nats1840(A taught by Professor M.h.armour during the Fall '10 term at York University.

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week2lecturenotes - Metal, Glass and Wood Metal Another...

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