DEVICE FOR CLEANING EXTRACTED PHOSPHORIC ACID Russian patent published in 2008 - IPC C01B25/234 

FIELD: chemistry.

SUBSTANCE: invention pertains to production of phosphoric acid with low content of impurities from extraction phosphoric acid, obtained from sulphuric acid decomposition of apatite. The device consists of pulsed columns for extraction of phosphoric acid, washing of the extract with water and re-extraction of the phosphoric acid with water. The device also consists of a precipitation tank for separation of residual content of the water phase from the organic phase, which has a cylindrical case with a metallic cup, installed at the centre of the case, in which an immersible pump is put for pumping the organic phase, a labyrinth from vertical partition walls and a conical bottom for collection and outlet of the water phase.

EFFECT: increased efficiency of separating the water phase from the organic phase; lower loss of the water phase from the organic and lower content of impurities of iron in the cleaned acid.

1 dwg, 1 ex