Studies were carried out on oxidized bismuth-containing products from a deposit in the Soviet Union in order to obtain technological data necessary for industrial evaluation of the deposit ...

The presence of large amounts of iron in the ores of non-ferrous metals, and consequently in the solutions obtained during their processing, complicates the technological process of extraction of these metals with naphthenic acids. Thus, the presence of divalent iron naphthenate in the extract makes it difficult to re-extract nickel and cobalt from the organic phase. In this regard, it is of interest to study the composition and properties of this salt.

The possibility of successfully using naphthenic acids for extractive extraction of non-ferrous and rare metals has been established by numerous studies. The widespread industrial use of this extractant from non-ferrous metallurgy is hindered by the unavoidable presence of ferric ions in the initial solutions. To remove these ions, it is proposed to use other extractants (for example, fatty acids) or hydrolytic precipitation, which undoubtedly complicates the technological process...

During extraction of non-ferrous metals from dilute solutions with naphthenic acids, salts are formed that are soluble in the organic phase and poorly soluble in water. The solubility of naphthenates in the organic phase is determined both by the nature of the solvent and by the composition of the extracted compound, which usually contains a certain amount of hydrated water ...