Metals and their uses part 1
- Created by: JessicaGrey
- Created on: 28-03-16 13:49
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- Metals and their uses
- Ores contain enough metal to make it economical
to extract the metal.
- Cost of extraction may change overtime.
- Ore -> concentrate -> chemical reaction -> metal
- Most metals found a compounds so need chemical reactions for extraction
- Very unreactive metals eg gold are found in pure form
- Metals that are less reactive than carbon can be
extracted from their oxides by reduction with
carbon (displacement reaction)
- Eg iron oxide + carbon -> iron + carbon dioxide
- Metals that are more reactive than carbon are extracted by electrolysis
- Large amounts of energy = very expensive
- Extraction of Copper
- Typically extracted from copper-rich ores by smelting (heating)
- Then purified by electrolysis
- Very damaging to the environment. Copper rich ores are running out
- New methods being developed to use low grade ores. (Phytomining and bioleaching)
- Phytomining= plants. Plants absorb the metal compound, then are burnt. The ash contains the metal compund
- Bioleaching= bacteria. uses bacteria to produce solutions that contain the metal compound.
- Then both have to be purified by electrolysis or displacement using scrap iron
- Phytomining= plants. Plants absorb the metal compound, then are burnt. The ash contains the metal compund
- Then both have to be purified by electrolysis or displacement using scrap iron
- Typically extracted from copper-rich ores by smelting (heating)
- Why should we recycle metals?
- Metal ores are running out.
- Mining metals is very damaging to the environment
- Extracting fresh metals uses more energy than recycling metals
- Extracting aluminium and titanium is expensive because it involves lager amounts of energy and involves many stages.
- Ores contain enough metal to make it economical
to extract the metal.
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