The production of phosphoric acid by sulfuric acid from high iron
content phosphate rocks such as (Abu-Tartur phosphate rocks) has
many disadvantages as low quality of produced acid and huge amounts
of calcium sulfate. Also traditional process for production of
dicalcium phosphate from wet phosphoric acid takes many steps.
According to these problems, this work concerned to produce feed
grade DCP by direct acidulation of Abu-Tartur phosphate rock with
HCl in order to decrease production cost and produce relatively
pure phosphoric acid. The leaching of phosphate ore by using dilute
HCl was achieved in order to get maximum P2O5 leaching relative to
minimum impurities. Kinetic analysis of the data indicates that the
leaching process is ash layer diffusion controlled process. The
production of DCP from direct acidulate phosphate rock was achieved
by precipitating P2O5 by CaCO3. This process has many advantages
over the conventional H2SO4 as: decrease production cost. In
addition, the production of phosphoric acid from the produced DCP
overcomes the traditional production problems and the produced
phosphoric acid is more pure than the phosphoric acid produced
directly by phosphate ore.
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