Ivashkiv V. Theoretical basis and technological foundations of electrochemical recycling pseudoalloys WC-Ni.

The object of study - the process of electrochemical oxidation dissolution pseudoalloys WC-Ni in solvents of different nature, and electrochemical processes occurring at the electrode surface by electrochemical oxidation or its dissolution. Methods: voltammetry and chronopotentiometry. energodispersive X-ray microanalysis, skanivna electron microscopy, cyclic voltammetry. Theoretical and practical results, developed the technological scheme and design electrolyzer process for electrochemical recycling of secondary raw materials volframvmisnoyi carbide type (pseudoalloys WC-Ni) to form a tungsten (VI) oxide, Nicole (II) sulphate crystalline. Scientific novelty: for the first time revealed the following: -nikeleva component pseudoalloys WC-Ni in H2SO4 solutions within potential -0.2 - 0.2 electrochemically dissolve the mechanism of unsteady diffusion of atoms never to the interface or ions never from the interface into the bulk electrolyte. For potential ? 0,5 In tungsten carbide WC oxidized to oxides of WO3-x (x = 0,1; 0,3); -selektyvne electrochemical dissolution of nickel component pseudoalloys in electrolytes based dimethylformamide (LiCl and NiCl2), which gives a regeneration of electrolytic nickel and carbide component (WC); -on the basis of developed mathematical models of communication potential electrode, temperature, concentration of sulfuric acid and ions in the electrolyte with Nikola current density and current output for optimum conditions of electrolysis (electrode potential of 1.6 - 2 in the temperature of the electrolyte 293 - 313 K concentration of acid 1 - 2.5 M, the concentration of ions in the electrolyte Nikola 0 - 1 M); -vyznacheno frequency band (0.1 - 0.16 Hz) and density symmetrical reverse current (30 - 40 A / dm2) in which the oxidation pseudoalloys WC-Ni is higher performance than DC. Level of Implementation: Completed pilot-scale test principle proposed flowsheet oxidation pseudoalloys WC-Ni ,, the company Argentum "NGO" Research Association "confirmed its effectiveness. Scope: Metallurgy, hydrometallurgy technology of electrochemical production; in research institutes and educational process.