Magnesium ions, along with other unavoidable impurities, are usually contained in solutions obtained during the hydro-metallurgical conversion of ore raw materials and in the aqueous part of the flotation pulp. It is of interest to clarify the composition and properties of compounds formed by magnesium ions with naphthenic acid, the possibility of using it for extraction of non-ferrous metals from solutions and flotation of some non-sulfide minerals has been established by many studies...

The method of separation of zinc and nickel with the help of ionites is based on the different strength of complex ions of these metals in aqueous solution. Thus, at a chlorine ion concentration of 1.5-2.0 g-ion/l, zinc forms complex anions, while nickel remains in the form of cations. The different charge sign of nickel and zinc ions in chloride solution can be used for separation of these metals by absorption of nickel cations by cationites or complex zinc anions by anionites.In this work both variants were investigated. Weakly acidic KB-4-P2 in Na-form and strongly acidic KU-2 in H-form served as cationites, strongly basic AB-17 in chloride form served as anionites.

The results of surface tension measurements of the same solutions obtained by different researchers often differ from one another. Although these differences are small, in some cases they are significant. Therefore, it is advisable to have a method of verification of experimental data of surface tension determination.

The presence of nickel in sulfide copper-nickel ores, isomorphically bound to some silicate minerals, sometimes predetermines the possible enrichment results of such ores. The recovery of silicate nickel during flotation is low, and a significant part of it is lost in the tailings. According to M.N. Godlevsky, silicates of copper-nickel ores containing nickel are easily decomposed by acids. In this connection, a combined method was tested for processing products with relatively high silicate nickel content.