PROCEDURE FOR PRODUCTION OF COMPLEX SILICEOUS FERRO-ALLOY Russian patent published in 2011 - IPC C22C33/04 

FIELD: metallurgy.

SUBSTANCE: charge loaded and melted in furnace consists of briquette mixture of silicon containing material, of ore part of charge with carbonic reducer in case of shortage in total charge and of intensifier of reduction process - quartz sand. Carbon-thermal process is carried out at temperature 1700-1850°C. As ore part of charge there are used natural sulphate and carbonate ore: gypsum and/or Celestine, and/or barite, and/or limestone. Also, ratio of quartz sand to ore part of charge SiO₂:(CaSO₄·2H₂O+SrSO₄+BaSO₄+CaCO₃) is maintained within ranges 2.0-100.0 of weight shares. Usage of quartz sand in briquette mixture as silicon containing material and simultaneously as intensifier of process facilitates more uniform distribution of components in mixture, and increases their contact surface, thus increasing reaction property of reagents. This reduces time of melting and time of reactions of liquid silicates with carbon and silicon carbide and reduces power consumption of the process.

EFFECT: higher intensity of development of these reactions results in increased degree of extracting metals into alloy, also, it decreases consumption of electric power and of materials of charge.

1 tbl