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 ...

For the correct choice of industrial extraction equipment it is necessary to know the rate of extraction processes.Previous studies have established the prospect of using extraction for the extraction of cobalt and nickel from layered solutions obtained during the processing of various metallurgical products ...

Replenishment of raw material reserves of non-ferrous metallurgy mainly by ores of complex composition, which are characterized by a fine mutual germination of minerals, and simultaneously increasing requirements for the full use of all valuable components of these ores urgently require the creation of new, more advanced technological schemes of their processing.

Electrolytic separation of tin from alkaline solutions is widely used in industry when using secondary raw materials. However, the cathode reactions occurring in this process have not been sufficiently studied, which excludes clear recommendations for the parameters of electrolysis (electrolyte composition, current density, and the relationship between these parameters). The present work aims to fill this gap.

Heterogeneous equilibria involving metal carboxylates have been studied in sufficient detail. Based on the results of these studies, an extraction series of elements has been compiled, which makes it possible to predict the direction of possible ion exchange reactions. At the same time, the kinetics of heterogeneous processes of this kind has not been studied, which prevents the elucidation of the mechanism of the reactions and the correct choice of equipment for the process.

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.

One of the ways to extract tin from tinplate waste is to dissolve tin in alkaline solutions containing methanitrobenzoic acid, followed by electrolysis. The technological solution is a complex multicomponent system. In addition to free alkali and methanitrobenzoic acid, it may contain stannates and stannites of tin, as well as various nitrobenzoic acid reduction products (azoxy-, azo-, hydrazo- and other compounds). The formation of carbonates is inevitable due to the absorption of carbon dioxide from the air ...

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...

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 possibility of using naphthenic acids for the extraction of some non-ferrous metals has long been established, but more detailed studies of this extractant have been published only in recent years. Thus, A. Fletcher and his co-workers established the dependence of metal extraction by naphthenic acid solution in kerosene on pH value and showed the possibility of separation of some metals by this method. The result of the research were several patents for the practical separation of metals. This process was applied for separation of copper and zinc from solutions obtained by leaching of pyrite cinders. The possibility of using naphthenic acids for the extraction of rare and rare earth metals has been investigated.

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.

Increase in production of non-ferrous metals requires finding methods of complex processing of poor polymetallic ores. One of the significant obstacles for wide industrial application of hydrometallurgical methods of processing of such ores is the absence of simple enough and economically favorable methods of selective extraction of metals from the resulting solutions.

The evaluation of the interaction of minerals with various reagents is of great importance for a number of technological processes (flotation, hydrometallurgy of ores, etc.). The possibility to establish the presence or absence of interaction facilitates the choice of the process regime, reducing the number of necessary experiments. Determination of the nature of this interaction makes it possible to consciously control the technological process.In addition, finding out the nature of the interaction of minerals with various reagents can be useful in the study of the properties of the minerals themselves.

In a significant part of gold-bearing deposits of the Soviet Union the main ore minerals are iron sulfides - pyrrhotite and pyrite. Therefore, it is of undoubted interest to study the behavior of these minerals in alkaline cyanide solutions used to extract gold from ore. There is a widespread opinion among gold industry workers that the main reason for high potassium cyanide consumption in the treatment of some ores or extreme duration of this treatment is the presence of pyrrhotite. However, there are no detailed studies on the behavior of pyrrhotite during cyanidation. The present work presents the results of studying the kinetics of interaction of pyrrhotite of one of gold-bearing deposits with potassium cyanide solution, the composition of which is close to those usually used in industry. The work done allowed us to suggest the mechanism of interaction of pyrrhotite with potassium cyanide solution under different conditions, and on this basis to propose ways to reduce the consumption of cyanide.