The role of iron and its compounds in processes of enrichment of sulfide ores of non-ferrous and noble metals

On the basis of the analysis of the literature data and the data of our investigations, the role of iron and products of its oxidation in sulfide pulps is shown. The technological factors are noted, such as the pH value of the medium, concentration of modifiers, mineral composition, and points and the order of batching flotation reagents; which affect the redox processes with the participation of iron and the characteristics of separation of sulfide minerals during flotation.     

Extraction of noble metals with macrocyclic compounds III: Extraction with calyxarenes

The third and final part of a review on the extraction of noble metals by macrocyclic compounds, which is devoted to extraction with O-, S-, and N-containing calyxarenes with a generalization of References from 1978 to 2008, is presented. it is noted that no systematic investigations on the extraction of noble metals with calixarenes has been performed until now. most works are qualitative and do not consider the regularities of the influence of the compositions of aqueous and organic phases and the properties of the extractant on the degree of metal extraction. the studied solutions are unlike production ones in regards to composition, and the chemical state of extracted ions in aqueous solutions is not always taken into account. it is emphasized that there is only fragmentary information on reextraction in the literature. the problem of the selectivity of extraction of noble metals with calixarene esters is discussed.     

Intermetallic compounds of rare-earth metals with aluminum and some of their properties

Conclusions The article reviews literature data on the systems of the rare-earth metals with aluminum, taking into account new results obtained by using high-purity rare-earth elements. The intermetallic compounds in these systems are classified. A table is included, summarizing the crystallographic, as well as some physical and chemical properties of all known intermetallic compounds in these systems.Translated from Poroshkovaya Metallurgiya, No. 8(44), pp. 76–85, August, 1966.