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The
process developed in the U K to produce magnesium hydroxide from
seawater is described, together with the heat treatment that the
hydroxide receives to produce the active oxide.
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Seawater and underground deposits of brine are important sources of
MgO.
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Worldwide, about 6 million tons of MgO are produced from sea water
each year, with US consumption around 730 thousand tons.
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MgO
were produced worldwide from magnesite ores with 1 million tons
produced from brines and seawater. China was
the largest producer from natural magnesite, accounting for nearly
one half the amount produced.
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MgO
usage varies widely. Higher-purity products produced from
seawater/brine tend to be used for refractory or industrial uses.
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The
process of isothermally sintering magnesium oxide obtained from
seawater by substoichiometric (where precipitation of
magnesium hydroxide took place with 80 % of the stoichiometric
quantity of dolomite lime) and by overstoichiometric
precipitation (which took place with 120 % of the stoichiometric
quantity of dolomite lime).
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Magnesium oxide obtained from seawater2-9 is a high-quality
refractory material, and its advantages lie not only in the huge
reserves of seawater10 (1 m3 contains 0.945 kg of magnesium), but in
the higher purity of the sintered magnesium oxide (> 98 % MgO).
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The
titration method is used to monitor the carbonate content of sea
water, fresh water and lime, in order to ensure that calcium
carbonate is not precipitated out with magnesium hydroxide.
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The
operating conditions that might be used for theproduction of good
quality caustic magnesia, i.e. caustic MgO with a low B2O3 content
has been determined.
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The
technology of obtaining magnesium oxide from sea water which a plant
of a company has been using for many years has been mastered.
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The
lime technology of obtaining magnesium oxide from sea water and salt
lake natural brine has been finished rather well and become
widespread not only in the USA, but also in Great Britain, Germany,
Austria, Mexico etc.
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