INERT ANODE DESIGNED FOR ALUMINIUM ELECTROWINNING IN FUSED SALTS, AND METHOD FOR MAKING SAME Russian patent published in 2009 - IPC C25C3/12 

FIELD: chemistry.

SUBSTANCE: method involves making the powder containing at least one mixed spinel-structured oxide and one component being metal R found as cations and reducible completely or partially when reduced with the said metal phase formed completely or partially. Herewith reduction process is enabled with powder carbonaceous material at least partially. While making the anode, mixture containing produced powder and binding agent is made that is followed with anode formation by mixture squeeze moulding. Binding agent is removed from the formed anode thereafter baked. The anode for making aluminium is metal-ceramic component of ceramic phase chemistry, besides optional dopants, satisfying formula where R is a cation of the metal chosen of copper, nickel, iron and cobalt, X is a cation of the metal chosen of nickel, chrome, aluminium and tin, Z is a cation of the metal chosen of titanium, zirconium, hafnium, vanadium, molybdenum and tungsten, M' represents cations of one metal with two valent states, differing from one, n and n-1. Herewith the said cations are found in the anode partially as cations M'ⁿ⁺ and partially as cations M'^(n-1)+, while the number of pairs M'ⁿ⁺/M'^(n-1)+ is sufficient to maintain specific conductivity of ceramic-metal at least equal to the preset value. M' is at least one metal chosen of iron, molybdenum, manganese, vanadium, cobalt and copper; x', y', z and (4 +δ) are numbers of X, R, Z, M' and O^2- ions respectively; x' can vary within 0.1 to 2.0; y' is zero or number less than 0.05; z is less than 1.5. Total (x'+y'+z) is less than 3; δ is positive, negative number or zero, thereby spinel oxide is electrically neutral. Metal phase is found as separate particles of average size 1 to 10 mcm distributed within spinel matrix.

EFFECT: ensured making metal-ceramic anode having metal phase with uniformly distributed metal fines.

46 cl, 2 dwg, 5 ex