Effect of pH and Ca and P ion concentration on the production of monetite from phosphate rock
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Introduction: monetite is a significant calcium phosphate phase known for its ability to be absorbed by bone tissues and to create a favorable environment for bone regeneration, positioning it as a biomaterial with high application potential.
Objectives: this study aims to obtain monetite directly from phosphate rock extracted in the Boyacá region of Colombia.
Methodology: leaching experiments were carried out using phosphoric rock and nitric acid at three different concentrations: 2, 4, and 5 M. The leach liquor was subsequently neutralized with sodium hydroxide (NaOH) at three different pH ranges: 3–4, 4–5, and 6–7. The obtained products were characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), and scanning electron microscopy (SEM) to verify the presence of the monetite phase and its morphology.
Results: the results showed that the monetite phase exhibits higher stability within a pH range of 3 to 4. It was also determined that pure monetite (100%) can be obtained using NaOH concentrations of 2 M and 5 M. At neutral pH values, the precipitation and stability of other phases such as hydroxyapatite were observed.
Conclusions: the direct production of monetite from phosphate rock from Boyacá is feasible under controlled pH and concentration conditions, with the acidic range being the most favorable for monetite stability.
- pH
- phosphoric rock
- solutions
- leaching
- charcaterization
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