2 Comments

1. The calcination of phosphate consumes the fossil energy and generates greenhouse gas emissions. This later owed
   not only on the consumption of these energies, but also in the decomposition of carbonates and in the combustion of the
   organic matter. The energy consumption and the emission of gases require an optimization of the calcination depending on
   the residence time and temperature of calcination. These walking parameters influence the chemical reactivity and the
   solubility of finished product. To assist in that, we have studied the evolution of the main components of the control in the
   calcination (Corg, CO2, P2O5, CaO), the specific surface area and density of the ore according to the time and temperature. This
   treatment was performed in the laboratory in a fixed bed. The different analytical techniques that were applied are: sieve
   analysis, quantitative study by ICP, the mineralogical characterization by X-ray and differential thermal analysis coupled with
   thermogravimetric analysis. The obtained results show that mechanisms relative to the heat treatment of the phosphate are
   multiple and are strongly influenced by the nature of the matrix and the parameters of the treatment. The obtained product
   answers well the trade profiles and the requirements for use under the conditions of a temperature approximately of 800°C
   and a period of 30 minutes. In these conditions, we note a decrease of 89.29% organic carbon and carbon dioxide of 72.72%
   with the increase in weight of Bone Phosphate Lime to 12.63%. However, the chemical reactivity and the solubility are
   affected.

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2. la calcination des phosphates du Maroc

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