apatite

New Solid-Solutions of Substitution Strontium (Sr) for Lead (Pb) in Apatite Structure

Strontium substitution for lead in $\mathrm{Pb}_{(8-x)} \mathrm{Sr}_x \mathrm{Na}_2\left(\mathrm{PO}_4\right)_6$ was analyzed using XRD, SEM, and Rietveld refinement techniques. All samples were synthesized using ceramic and semi-ceramic technologies. Pure apatite was formed in the composition from $x=0.00$ up to $x=2.75$. The results indicate that the samples’ collected compositions agree with the values calculated.

Development of Ammophos Production Technology from Algerian Phosphorites

Technological aspects of ammophos production using Algerian phosphorites as a raw material have been investigated. The necessity of increased consumption of sulphuric acid during the Algerian phosporites processing compared with apatite processing has been grounded. The dependence of pH solution on NH3:H3PO4 molar ratio has been determined during neutralization of extraction phosphoric acid prepared from Algerian phosphorites. The necessity of acid solution deeper neutralization in the technology of extraction phosphoric acid production has been proved.