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- Created by: popparty11
- Created on: 22-04-15 12:57
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- Tin
- Uses of tin
- Fillings
- Most fillings contain a mixture of tin, silver, copper, zinc and mercury
- Solder in electronic gadgets
- An alloy of tin that melts at low temperatures and conducts electricity.
- Coats steel cans
- Iron in the steel alloy does not react with food acids, water or oxygen
- Fillings
- Getting hold of tin
- In the Earth's crust
- Tin oxide
- Most tin comes from China, South America and South-east Asia
- Cornwall
- Mined for thousands of years
- Tin from abroad was cheaper
- Mines in Cornwall shut down
- Industry in tin had increased
- Is it worth mining in Cornwall once more?
- Industry in tin had increased
- Mines in Cornwall shut down
- In the Earth's crust
- Recycling Tin
- Recycling tin uses less energy and produces less waste than getting tin from the ground
- Recycling companies separate the tin from the steel that it coats
- Then the tin is used to make more things - perhaps even more tin cans!
- Environmental costs
- To get tin out of tin oxide, companies heat tin oxide with carbon
- Carbon takes oxygen from tin oxide. The products are tin and carbon dioxide gas.
- tin oxide + carbon ? tin + carbon dioxide
- The rock that is not useful is dumped into huge spoil heaps.
- Few plants grow on spoil heaps as what little soil there is, it may be contaminated with poisonous arsenic compounds.
- To get tin out of tin oxide, companies heat tin oxide with carbon
- Uses of tin
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