الفهرس 
World Production of Phosphate RocksOnly 14 pages are availabe for public view
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Abstract
Leaching of Abu-Tartur phosphate ore by hydrochloric acid was investigated. The influence of the various factors affecting the process as the particle size of the ore, leaching time, hydrochloric acid concentration, leaching temperature, mixing speed and phosphate ore/ HCl ratio have been investigated to estimate the favor phosphate ore leaching process in relation to an impurity.
The leaching kinetic of P2O5 and Ca from Abu-Tartur phosphate rock using dilute hydrochloric acid has been investigated. The influence of HCl concentration, liquid/ solid ratio, particle size and temperature were studied in order to explain the leaching kinetic of phosphate rock. The kinetic data show that the leaching process can be described by a shrinking-core model and leaching rate was controlled by the diffusion of reactants through a porous ore. The apparent leaching activation energy for P2O5 and Ca were found to equal 14.4 and 22.6 kJ/ mol, respectively.
The produced aqueous acidulate solution from leaching process was neutralized in such a way that a pure dicalcium phosphate (DCP) for animal fodder is precipitated. The different factors affecting on the (DCP) precipitation reaction as reaction time, reaction temperature, mixing stirring speed and acidulate solution/ calcium carbonate, v/ m, ratio were investigated.
DCP precipitate raffinate solution was treated with sulfuric acid in order to recover HCl for reuse in leaching process. The influence of the various factors affecting the process as precipitation time, H2SO4 concentration, precipitation temperature, mixing stirring speed and raffinate solution/ H2SO4 ratio have been studied.
The produced phosphoric acid from calcium phosphate is more pure than the phosphoric acid produced directly by Abu Tartur phosphate ore. The effect of added H3PO4 and H2SO4 concentrations, temperature, mixing time, H3PO4/ dicalcium phosphate, v/ m, ratio, H2SO4/ dicalcium phosphate, v/ m, ratio, H2O/ dicalcium phosphate, v/ m, ratio and mixing stirring speed in production process were studied.