论文部分内容阅读
Change in valency of Nb-oxide in MnO-SiO_2-Nb_2O_5 system was studied with the electrochemical method using ZrO_2 asthe solid electrolyte.Thermodynamic analysis has shown that the only possible reaction that could take place at the working elec-trode is:2(Nb_2O_5)=2(Nb_2O_4)+O_2 with the a_0 values experimentally evaluated,values of a Nb_2O:/a Nb_2O:were calculated andisoactivity-ratio curves drawn in MnO-SiO_2-Nb_2O_5 triangles at 1418 and 1585K.The simultaneous existence of tetra-andpenta-valent Nb mineral constituents in industrial Nb-bearing slags was thus verified experimentally.
Change in valency of Nb-oxide in MnO-SiO_2-Nb_2O_5 system was studied with the electrochemical method using ZrO_2 asthe solid electrolyte. Thermoodynamic analysis has shown the only possible reaction that could take place at the working elec-trode is: 2 (Nb_2O_5 ) = 2 (Nb_2O_4) + O_2 with the a_0 values experimentally evaluated, values of a Nb_2O: / a Nb_2O: were calculated andisoactivity-ratio curves drawn in MnO-SiO_2-Nb_2O_5 triangles at 1418 and 1585K.The simultaneous existence of tetra-andpenta -valent Nb mineral constituents in industrial Nb-bearing slags was thus verified experimentally.