SYNTHESIS OF HIGHLY DISPERSED MOLYBDATE OF COBALT IN THE MELT SYSTEM (Na2MoO4 - NaCl)EVT – CoSO4

Abstract

The paper presents a new computational and experimental material for the development of a rational method for obtaining one of the significant representatives of the elements of the d-family-cobalt molybdate in melts of the system (Na2MoO4 - NaCl)evt-CoSO4 in a highly dispersed state at a relatively low temperature and high process performance. It contains extensive material on the properties and applications of cobalt molybdenum, a critical analysis of which indicates the need to develop new approaches to the synthesis of such a unique compound. Along with experimental problems, the article also solves a number of theoretical issues. In particular, we are talking about the application of the mass transfer effect between Mn(Fe,Co)MoO4 – Na2CO3 systems and the environment for the first time revealed by the authors to the analysis of the drug CoMoO4 synthesized in the work. The mechanism of manifestation of this phenomenon, which, as shown by theoretical analysis and experimental data, due to polyvalences cobalt. Therefore, this is due to the possibility of leakage in the system CoMoO4–Na2CO3 exchange reaction CoMoO4+Na2CO3→CoCO3+Na2MoO4, dissociation CoCO3=CoO+CO2 and redox of хCoO+1/2О2→CoхOу, where y=x+1, leading to the loss of CO2 and the transformation of CoO – product of the decomposition of CoCO3 at the expense of the oxygen environment to the oxide type CoхOу, the composition of which is determined by the process temperature. The experimental data obtained in this work confirm the effectiveness of the mass transfer effect in the analysis of molybdenum and tungstates of polyvalent d-elements. Much attention is paid to the comprehensive study of the obtained cobalt molybdate in the system (Na2MoO4 - NaCl)evt–CoSO4 by a complex of physical and chemical methods (thermodynamic, x-ray phase, dispersion, chemical kinetic (thermogravimetric)).