Generally, phosphate rock contains about 0.05 wt% rare earth elements (REEs) on average.
And the world commercial phosphate rock production is estimated to be 250 million tons per …

Apatite concentrate is an important source of phosphate and contains significant amounts of
rare earth elements (REEs). In this study, the possibility of selective phosphoric acid …

The paper reports an investigation on the reduction of synthetic gypsum and a Tunisian
phosphogypsum sample in pure nitrogen or loaded with H 2 O vapor, using graphite or …

The batch dissolution kinetics of sand particles in concentrated alkaline sodium hydroxide
solutions was investigated at high temperature and high pressure. The influence of the …

A calorimetric study of the kinetics and thermodynamics of the attack of a phosphate ore from
Gafsa region (Tunisia) by phosphoric acid and by a mixture of phosphoric acid and sulfuric …

A thermochemical study of hydrochloric acid attack of synthetic fluorapatite was performed
by a DRC. The calculated thermogenesis curves show one peak. The plot of the heat …

The attack of fluorapatite (Fap) by phosphoric acid solution between 25 and 65 C was
followed by microcalorimetry. The molar enthalpy decreases until a temperature close to 45 …

This paper deals with the modeling and simulation of the acidulation (dissolution) of
phosphate ore particles in a dilute phosphoric acid solution in a batch stirred tank reactor. A …

A first principles model is developed to describe the dissolution mechanism of phosphate
ore particles in a solution of phosphoric acid. It is based on mass balance equations along …

The thermochemical and kinetic study of the attack of “B” type carbonate fluorapatites (B-CO
3-Fap) by a (19% w/w P 2 O 5) acid solution was performed using microcalorimetry at a …