Metallurgy with Non Water Liquids
New Solvometallurgical Methods for the Treatment of Mineral and Technogenic Raw Materials of Rare and Non-Ferrous Metals
Tech Area / Field
- CHE-IND/Industrial Chemistry and Chemical Process Engineering/Chemistry
8 Project completed
Senior Project Manager
Mitina L M
Mendeleev Chemical Technological University, Russia, Moscow
- VNIIKhT (Chemical Technology), Russia, Moscow
- University of Hertfordshire, UK, Herts, Hartfield
Project summaryThe aim of the project is the elaboration of theoretical basis and the development of a new technological direction in the treatment of mineral and technogenic raw materials of rare and non-ferrous metals - solvometallurgy, based on the application of non-aqueous (organic or inorganic) media. The replacement of water (completely or partly) on non-aqueous solvent as a medium for chemical reactions will allow to change principally the existent conception of raw material treatment. Advantages of solvometallurgical methods will include the decrease of energy consumption, drastic improvement of processing selectivity, reduction of the number of stages by the combination of several operations (i.e. grinding, leaching, solvent extraction - simultaneously). The combined application of the methods of mechanical chemistry and the solvometallurgy will allow to improve the treatment of so called resistant materials as well as high silica content raw materials significantly and turn from high temperature (pyrometallurgical) to low temperature processes in non-aqueous or water-organic media.
The practical implementation of the solvometallurgical procedures will allow to solve the very important problem of the expansion of raw material resources and from the other hand to decrease the sharpness of ecological problems because the dumping of toxic wastes will be excluded due to regeneration and recycling of the solvents.
Technical Approach and Methodology
The methodology of the development of new low-temperature solvometallurgical methods of the treatment of technogenic materials (the wastes of metallurgical and processing plants) is based on the thermodynamically permitted processes of oxidizing dissolution of metals and its alloys in dipolar aprotonic solvents and the facts of possibility of its application for zirconium minerals, as well as for gold- and rare earth - containing ores.
Special methods of process activation are developed for the solution of problems connected with the treatment of rare and non-ferrous raw materials, especially for resistant minerals and high silica containing ores. Mechanochemical methods of preliminary treatment of raw materials allow sharply to decrease the reagent-, energy consumption and the number of stages of the technological process by combination of the operations of mechanical activation, leaching, solvent extraction due to directional influence on crystal structure of the substances in solid state and following selective dissolution of the «activated» material in non-aqueous solvent.
All technological processes are designed in such a way, so it will be possible to employ a closed technological cycle using the distillation of solvent.
The development of quantitative characteristics of ions and salts reactivity in the relation of donor-acceptor interaction will allow to predict the passing of processes in non-aqueous media and directly to effect their rate and intensity.
The establishment of regularities connected with the influence of mechanical activation on transformations of minerals structure will allow to intensify the processes of decomposition of natural and technogenic raw materials considerably.
The fulfillment of the main tasks of the project will allow to elaborate the theoretical grounds for a new technological direction - solvometallurgy and to develop fundamentally new resource-saving and ecology safe methods of treatment for mineral and technogenic raw material of rare and non-ferrous metals.
The potential role of the foreign collaborators
The potential role of the foreign partners consists in the discussion of problems and the exchange of information, obtained during the Project.
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