Pruebas de extracción de vanadio a presión a partir de calizas negras provenientes del sector Puyango provincia de Loja

Abstract

Abstract: The objective of this research was to carry out tests for the extraction of vanadium under pressure leaching with sulfuric acid, where variables such as temperature and pressure were set in black limestone in the Puyango sector, Loja-Ecuador. A physical, chemical and mineralogical characterization was carried out where the mineral phases were obtained: calcite, quartz and in smaller quantities minerals that contain vanadium such as sherwoodite, rosite and ronneburguite. The oxidation states III, IV and V of vanadium were determined by speciation with distilled water, sulfuric acid and hydrochloric acid, where 0.59% of V (V) was obtained with distilled water; 6.95% with hydrochloric acid and 0.65% vanadium with sulfuric acid between states (IV) and (V), while 91.8% vanadium was obtained with state (III). During the hydrometallurgical process, the concentration and time were varied; Finally, the wet sample was washed with distilled water to increase the yield and obtain between 75% and 85% of vanadium recovery. With the proposed pressure leaching, it is concluded that a higher performance is obtained at high temperatures, concentrations and pressure.