Good Science Victorian Curriculum Year 7
Digital sample of Matilda's newest publication, Good Science Victorian Curriculum Year, authored by Emma Craven and Aaron Elias. For more information visit www.matildaeducation.com.au or email Katrina Tucker, katrinatucker@matildaed.com.au
Digital sample of Matilda's newest publication, Good Science Victorian Curriculum Year, authored by Emma Craven and Aaron Elias. For more information visit www.matildaeducation.com.au or email Katrina Tucker, katrinatucker@matildaed.com.au
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CHEMICAL SCIENCES<br />
5.5<br />
SEPARATION<br />
TECHNIQUES:<br />
FROTH<br />
FLOTATION<br />
AND MAGNETIC<br />
SEPARATION<br />
LEARNING INTENTION<br />
At the end of this lesson I will be<br />
able to describe the processes<br />
of froth flotation and magnetic<br />
separation and suggest when<br />
these techniques should be used.<br />
KEY TERMS<br />
fractional distillation<br />
a method that separates liquids<br />
by using their different boiling<br />
points<br />
froth flotation<br />
a method that uses special<br />
chemicals to separate minerals<br />
from their ores<br />
mineral ore<br />
a mineral that contains useful<br />
metals<br />
1<br />
We obtain many useful resources from Earth, such as metals<br />
and oil. Once raw materials have been extracted, they must<br />
be processed to separate the useful material from the waste.<br />
Froth flotation uses water to separate<br />
metals<br />
Copper is used for electrical wiring and plumbing pipes. It is rarely found<br />
in its pure form; instead, it is found as a mineral ore called malachite.<br />
Before copper can be purified, it must be separated from the other rocks<br />
and material in the ore. This is done using froth flotation.<br />
The mixture of unwanted material and copper is dug out of the ground<br />
in solid lumps. These are crushed into a fine powder, and mixed with<br />
water and some detergent-like chemicals. Air is blown into the bottom<br />
of the container, and the malachite is carried to the surface by the air<br />
bubbles as it sticks to the chemicals. The waste sinks to the bottom of<br />
the tank, unable to stick to the chemicals.<br />
The malachite froth containing the copper is skimmed off the surface.<br />
It’s then further treated to extract pure copper.<br />
How does froth flotation separate metals from ore?<br />
Figure 5.9 Froth flotation<br />
separates copper minerals from<br />
waste rock. Copper minerals<br />
are attracted to detergent-like<br />
chemicals and skimmed off for<br />
further processing.<br />
LITERACY LINK<br />
READING<br />
Read the paragraph describing<br />
froth flotation and draw a<br />
diagram showing how it works.<br />
NUMERACY LINK<br />
GRAPHING<br />
10 kg of iron ore was separated<br />
using magnetic separation,<br />
recovering 3.5 kg of iron.<br />
Calculate how much of the ore<br />
was not iron, then draw a pie<br />
chart to show this.<br />
76 GOOD SCIENCE VICTORIAN CURRICULUM 7
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