STUDY OF THE COPPER, MANGANESE AND IRON SELECTIVE EXTRACTION REGULARITIES FROM TECHNOGENIC HYDROMINERAL DEPOSITS BY THE NEUTRALIZATION METHOD
Authors:   Magnitogorsk State Technical University named after G. I. Nosov, Medyanik N. , Mishurina O. ,   Magnitogorsk State Technical University named after G. I. Nosov, Mullina E. ,   Magnitogorsk State Technical University named after G. I. Nosov
Published: October 2021

The article presents a factor analysis of the processes of selective concentration of metals by the neutralization method. In this work, the chemistry of the selective extraction process of heavy metal cations from aqueous solutions by the neutralization method is experimentally studied. The mutual influence of the components of matrix solutions on the index of the extraction degree of Cu (II), Mn (II) and iron ions in mono- and multicomponent model systems has been studied. Based on the results obtained, it is established that the use of the neutralization method for the staged isolation and concentration of valuable components from technical solutions in the form of the target product is possible only in a combination of a set of methods: flotation, flocculation and coagulation. It was found that in the process of neutralization of multicomponent solutions, quantitative extraction from technical solutions is possible at the following pH values: Fe (III)– 4.0, Fe (II) – 6.3, Cu (II) – 6.4, Mn (II) – 9.9. It is indicated that a decrease in the initial concentration of Fe3 + ions in a solution leads to an increase in the pH values of the beginning of its precipitation in the form of a dispersed phase of ferric hydroxide. The rational parameters of the pH values of the studied aqueous systems, at which the selective separation and concentration of the main components of technological solutions with a priority content of Fe (III), Fe (II), Cu (II) and Mn (II) ions is possible, have been experimentally substantiated. The extraction of manganese cations, using the method of neutralization from the studied multicomponent solutions, is impossible for the coprecipitation of all designated metal cations. Therefore, based on the high reductive activity of the divalent form of manganese, it is advisable to selectively concentrate it using the method of redox electrodeposition, the products of which are sparingly soluble stable compounds of trivalent and tetravalent manganese. The relevance of research lies in the need to process acidic mine waters of mining enterprises of the copper-pyrite complex in order to significantly expand the raw material base of mining enterprises, as well as to improve the ecological situation of the city-forming mining enterprises of the South Urals. The purpose of the study is to study the material composition of mine waters and develop a technology for the selective extraction of cationic forms of copper, manganese and iron. The object of research is technical mono- and multicomponent solutions with a high content of metal cations: Cu2+, Mn2+, Fe2+ and Fe3+. The subject is the possibility of using the neutralization method for the selective processing of hydromineral resources of mining enterprises of the copper-pyrite complex. Material and research methods. General scientific and special research methods have been used during the work. In the implementation of the experiments, a complex of physicochemical methods of analysis has been used: thermodynamic analysis, UV spectroscopy, chemical and assay analyzes. To determine the content of heavy metal ions, adapted methods of photometric analysis have been used: for copper (II) - with pyramine epsilon, for total iron – with o-phenanthroline, for manganese (II) ions – with their preliminary oxidation to permanganate ions