Comprehensive Recovery& Sustainable Development of Phosphate Resources
Patrick ZHANG.pdf
Patrick ZHANG.pdf
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Three Major SX Systems<br />
Process Extractant Formular<br />
OPPA<br />
D2EHPA/TOPO<br />
DEPA/TOPO<br />
Octyl pyrophosphoric acid<br />
Dissolving P 2 O 5 in octyl<br />
alcohol in the absence <strong>of</strong><br />
moisture and below 15 o C<br />
A mixture <strong>of</strong> di(2-thylhexyl)<br />
phosphoric acid and<br />
trioctyl phosphine oxide,<br />
{H3C(CH2)7}3-P=O<br />
where R is CH3.(CH2)6.CH2-<br />
OPAP process<br />
A mixture <strong>of</strong> mono and<br />
di-octylphenyl<br />
phosphoric acids and tributyl<br />
phosphate, (C4H9O)3-P=O
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