Paper Title
The Novel Hydroelectrometallurgical Technology of Simultaneous Production of Metallic Manganese, Electrolytic Manganese Dioxide and Manganese Sulfate Monohydrate

Abstract
The novel hydroelectrometallurgical technology is developed to simultaneously production of electrolytic metallic manganese, electrolytic γ-MnO2 and MnSO4•H2O in one technological cycle. The united, complex technological scheme consists of two technological lines. One of these lines is designed for: By sulfuric acid leaching of MnO containing primary products formed by high thermal reduction of manganese oxide ores; Purification from Fe3+, Ni2+,Co2+ and other heavy metals cations by hydrolysis (pH 4) and adding Na2S into the MnSO4 solution; Crystallization of MnSO4•H2O after treatment of concentrated MnSO4 solution in autoclave under high temperature condition; Supply of hot, autoclave outlet solution of MnSO4 to anodic area (anodic area is separated by anionic membrane to prevent flow of NH4+ into anolyte) where γ-MnO2 is deposed on the anode [1]. The second technological line is designed for: Purification of solution prepared from MnSO4•H2O produced in the autoclave and technical (NH4)2SO4 by (NH4)2S and supply of purified solution to the cathodic area of the same reactor where metallic Mn is deposed on the cathode. In accordance with presented technological scheme, optimal technological parameters are determined for MnSO4•H2O and 50-55 g•l-1Mn2+containing solutions obtained by autoclave treatment of concentrated clean solution of MnSO4 (115g•l-1Mn2+) produced after processing of manganese oxide ore. The technological novelty also is exploitation of heat pump to maintain 35-380C in catholyte and 92-940C in anolyte in an electrochemical reactor working under 20A load and divided by anionic membrane (AMI 7001S). As a cooling agent of heat pump, R-600a (isobutane) was chosen. The evaporator of the heat pump was immersed into the catholyte and the condenser - into the anolyte. The effectiveness of heat pump was also determined.