In the process of preparation of polymer solutions, depending on the type of stirring device and the shape of the vessel, power on the shaft and mixing time, polymer molecules are subjected to mechanical impact and in accordance with the level of this impact can be partially or completely destroyed (mechanodestructured).

The difficulties of oxidative roasting of sulfide materials are well known. Pyrrhotite concentrates - wastes of enrichment of some sulfide polymetallic ores among other sulfide raw materials occupy a special position ...

Recent decades have been marked by the emergence of fundamentally new technological techniques designed to intensify various technological processes. Among such techniques is the method of weighted layer. Production of non-ferrous metals (pyrometallurgical processing), oil refining, obtaining some building materials, sulfuric acid production, drying of grain, plastic masses and paste-like materials, granulation of salts and some other processes are developed to a greater or lesser extent on the basis of application of the suspended bed.

Ion exchange is widely used in hydrometallurgy, especially in the extraction of rare earth or dispersed elements from solutions. The field of application of ionites in non-ferrous metallurgy can be significantly expanded, firstly, if sufficiently cheap and high-capacity domestic ionites are available, and secondly, if the mechanism of the ion exchange process is known, which makes it possible to obtain, analyze and use appropriate kinetic equations. For a number of cations (copper, zinc, etc.), the domestic KU-2 cationite can be confidently attributed to the number of ionites meeting the first requirement. Not having selectivity with respect to ions of a certain grade in the combined presence of several ions, KU-2 cationite turns out to be quite capacious with respect to each of the cations individually.

A gushing layer can serve as one of the intensive methods of contacting a solid material with a liquid. While a significant number of works have been devoted to its hydrodynamic patterns in the G—S system, there is practically no work on the hydrodynamics and mass transfer of the gushing layer in the G—S system. The lack of a complete analogy in the behavior of these two heterogeneous systems, caused by a significant difference in the viscosity and density of the light phases of L and G, urgently requires independent hydrodynamic studies of the gushing layer in the L—S system...

Большой экспериментальный материал по кинетике про­цесса обжига пирротина  позволил установить влияние температуры, концентрации кислорода, размеров частиц на скорость процесса окисления. Окислительный обжиг пирротинов представляет собой сложный физико-химический гетеро­генный процесс, сопровождаемый образованием газообразных и твердых продуктов реакции, что приводит к появлению допол­нительного сопротивления массопередаче, вызванному диффу­зией кислорода через пористый слей твердых окислов ...