مریم کارگرراضی

The studied area in this research is the Esfordi phosphate mine in the Bafq metallogenic state, which apatite, magnetite and hematite are its main mineralization. As one of the high phosphorus iron – apatite mine in the region, this mine contains significant mineralization of rare earth elements with a maximum and average grade of 1.7% and 0.5% (as monazite, zircon and allanite minerals in apatite), and has LREE enrichment and Eu negative anomaly.  In order to primary assessment of REEs concentration status in study area, the outlook coefficient of REEs (Koutl), which is based on the classification of REEs by the level of industry demand, was used. This coefficient is the ratio of the amount of critical REEs (Dy, Tb, Nd, Y, Er and Eu) to the amount of surplus REEs (Ce, Ho, Tm, Yb and Lu), which can be used to investigate mineralization of different types in newly discovered deposits and active mines. The results indicate the highest outlook coefficient (Koutl=0.67) for microgranite to rhyolite with amphibole unit, and also promising average outlook coefficient of 0.53. The Esfordi mine despite the lower grade, it is closer to the ideal composition compared to China's Bayan Obo mine (Koutl=0.2). Thus, can portend a bright future for REEs in this mine, if focus on exploration of these elements and further geochemical and mineralogical investigations are carried out.

Potassium Khor-Biabanak is a rich source of magnesium, calcium, potassium, and sodium. In this research, we tried to separate and precipitation of their calcium and magnesium in the presence of other cations and anions using oxalic acid as a precipitator. Before the experimental phase, simulation of the reactions, and prediction of the results were performed using Stabalk modeling software. Based on the data processing of this software and also the obtained experimental results, the best molar ratio of oxalic acid to calcium and magnesium obtained for calcium separation from saline were 1.05: 1 and 1.25:1, respectively. The obtained analyzes showed that using this method, separation of 87% of calcium and 88% of magnesium from saline is possible and 95% and 94% purity for extracted calcium and magnesium oxalate salt are available, respectively.

In this paper, synthesis of Copper Oxide nano rod particles from Copper Oxide microparticles obtained from Gold ore flotation concentrate in Copper Sulfate salt medium under specific temperature, pH and time conditions. Morphology and dispersion using Sodium Tartarate salt as the main reactant was done. The results were confirmed by XRF, XRD, SEM, EDX measurements. The EDX and SEM results show the synthesized and calcined (300-410 ºC, t=50-75 min) Copper nanorods in 1% sodium Tartrate medium, and finally formed particle rods with a size of 54 × 215 nm.