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Solvent Extraction
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Solvent extraction (also known as chemical extraction) is a cleanup
method that uses solvents to extract or remove harmful chemicals from
polluted materials.
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Cleanup using solvent extraction is generally quicker than methods that
treat the soil in place. It can be done at the site to avoid trucking
polluted soil to cleanup facilities offsite. This saves money on
transport and disposal of the soil.
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Solvent extraction is a widely used separation process in many parts of
the chemical industry. It also ?nds application in the production of
pharmaceuticals, environmental engineering, and the minerals industry.
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Solvent extraction is often an alternative to distillation. Both are
staged processes that depend upon the distribution of key components
between two essentially immiscible phases.
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The
first metal to be recovered in significant quantities using solvent
extraction was uranium.
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Today
around 25% of the world’s copper is recovered using solvent extraction
and solvent extraction is considered to be the lowest cost production
route for the production of quality cathode.
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Although the quantity of precious metals currently recovered using
circuits that involve solvent extraction is small the value of these
metals is significant.
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In a
perfect world, the chemical industry would be able to supply low cost,
effective extractants for every important type of metal separation.
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Solvent extraction has progressed from being a process which solved some
of the environmental problems of other metallurgical routes to being a
target itself for environmental examination.
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The
greatest contribution in achievements of solvent extraction provided
extractants based on hydroxyoximes. As they were synthesized there were
no better copper extractants, and since then all investigations were
performed in order to improve their properties.
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With
the recently developed technologies that are now under investigations in
demonstration plants and ongoing research into improved technologies, we
can safely predict that solvent extraction will eventually contribute to
an increasing fraction of the copper produced each year not only from
oxide but also from sulphide ores.
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