L6 Metals from sustainbillity point of view

Question 1

When is aluminium suitable?

Answer 1

*Production of primary aluminium requires a lot of energy
*Much less energy is required for recycling
=> Suitable for recyclable products, less suitable for non-recyclable
products

Question 2

Steel

Answer 2

*Relatively low environmental impact
*High strength in relation to environmental impact

Question 3

The most common metals most widely found in the earth’s crust:

Answer 3

Fe, Al, Mg, Ti

Question 4

Scap problems and solutions

Answer 4

*When re-use of scrap, the control of alloying substance is a problem
*Excess alloying and polluting metals may or may not be uneconomic to remove
*Sorted scrap is more useful and has higher value

Question 5

Metals and recycling

Answer 5

Metals are well suited for recycling
- Saves resources and energy
- Provides equally good material

Question 6

Problem with recycling metals

Answer 6

*Problems with impurities and alloying