In this study, solvent extraction is applied for extracting nickel from sulfate solutions containing iron and cobalt ions. This process can also be the cleaning of waste increasing solution concentrations after leaching low-grade ores. Di-2-Ethylhexyl phosphoric acid (D2EHPA) was used as an extractant purpose. Effects pH, aqueous/organic (A/O) phase ratio, iron, ion contents on efficiency were ...

Estonian phosphorite ore contains trace amounts of rare earth elements (REEs), many other d-metals, and some radioactive elements. Rare elements, Mo, V, etc. might be economically exploitable, while toxic should removed before any downstream processing for environmental nutritional safety reasons. All untreated hazardous remain in landfilled waste much higher concentration than they occur natur...