Electrolytic deposition of silicon and of silicon alloys. Part IV: Preparation of alloys with a high content of silicon, and silicon refining

Synthesis of Silumins in KF-AlF3-SiO2Melts

“…A promising method to synthesize silumins is a direct one-stage method utilized in the technology of industrial aluminum involving the electrolysis of NaF-AlF 3 -Al 2 O 3 -SiO 2 melts at temperatures ranging from 960-1000 • C. 1,[5][6][7][8][9][10] Physicochemical properties of these melts, as well as the properties (allocation potential and cathode current density) of the obtained silumins (with Si concentration up to 19.3 wt%), have been investigated.…”

“…These observations can be connected to both the low dissolution rate of SiO 2 in melts 14 and the thermal decomposition of NaF-AlF 3 -Al 2 O 3 -SiO 2 melts with the formation of gaseous SiF 4 and NaAlSiO 4 at high temperatures. 10 The thermal stability of a melt can be increased by decreasing the temperature. Therefore, an alternative way to obtain silumins is based on using KF-AlF 3 melts as electrolytes for obtaining aluminum at temperatures ranging from 750-850 • C. [15][16][17][18][19] This work is devoted to examining the synthesis of silumins in a KF-AlF 3 melt at a temperature of 720 • C by an electrochemical method and determining the kinetic parameters.…”