Metal Theory (Yr 9)

The order in which steel and copper are processed;

• Crushing of ore, smelting, use of blast furnace, smelting

• Mining, use of blast furnace, crushing of ore, smelting

• Mining, smelting, crushing of ore, use of blast furnace

• Mining, crushing of ore, use of blast furnace, smelting

Order of processing aluminium

• Mining, electrolysis, crushing of ore, purifying bauxite into alumina,

• Electrolysis, mining, crushing of ore, purifying bauxite into alumina.

• Mining, crushing of ore, purifying bauxite into alumina, electrolysis.

• Mining, purifying bauxite into alumina, crushing of ore, electrolysis.

Metals can be argued as 'environmentally friendly' because;

• of the amount of energy needed to process, transport and manufacture them

• Their ability to be recycled

• Their expected life-expectancy

• the way in which they are extracted from the Earth's crust

• the length of time they remain in the environment after disposal

Metals need to be separated carefully before recycling because;

• metals can react with each other dangerously

• mixing metals speed up the process of oxidisation

• only certain metals can be recycled

• impurities them will affect the metal's properties

Stock forms;

• Are more expensive

• Allow consumers to 'shop around'

• Enable designers to keep the cost of products down

• Enable manufactures to specialize, keeping costs down

• Can create problems with handling and transportation

Stock forms of metals include;

• Planks

• Rod

• Granules

• Sheet

• Beam

Metals can be argued as 'environmentally unfriendly' because;

• of the amount of energy needed to process, transport and manufacture them

• Their ability to be recycled

• Their expected life-expectancy

• the way in which they are extracted from the Earth's crust

• the length of time they remain in the environment after disposal

Deburring metals;

• Improve safety

• Improve the way metal products feel

• Improve the way metals look

• Reduce the cost of metal products

oxidisation...

• is a reaction between a metal and oxygen

• always reduces the strength of the metal

• is always unattractive

• can cause problems with iron-based products

Surface finishes are applied to materials...

• To make them cheaper to produce.

• To improve a materials aesthetics.

• To improve a materials functionality.

• To improve the material's ability to be recycled.