MAGNETITE CASTING METHOD Russian patent published in 2018 - IPC C25B11/00 C23F13/12 

FIELD: metallurgy.

SUBSTANCE: invention relates to the production of magnetite casting and magnetite anodes used for the electrolysis of aqueous media (pH 2÷14) and cathodic protection against corrosion. Heating and melting of charge from fine enriched magnetite ore are carried out by casting and crystallization of the melt in a carbon dioxide atmosphere at atmospheric pressure. Before melting the charge is heated and held for 30 minutes at a temperature of 1560 °C. Melting is performed in a melting furnace at a temperature of 1575 °C. Melt is aged for 25–35 minutes at a temperature of 1630–1640 °C before casting into molds. Molds with crystallized casting at a temperature of 1500–1200 °C is placed in furnace with a protective atmosphere based on inert gas of nitrogen or argon at a pressure of 1 atm and oxygen partial pressure in protective atmosphere of 10^-4–10^-5 atm. Cooling to room temperature of 20–25 °C is carried out at a speed of 40–60 deg/h.

EFFECT: obtained cast magnetite of stoichiometric composition is homogeneous in structure with sufficient reproducibility for non-stoichiometry and specific electric conductivity.

1 cl, 2 dwg, 3 ex, 4 tbl