CHARGE AND METHOD FOR ELECTRIC-FURNACE ALUMINOTHERMIC PRODUCTION OF FERROBORON USING IT Russian patent published in 2014 - IPC C22C33/04 

FIELD: metallurgy.

SUBSTANCE: charge is proposed at the following component ratio, wt %: boric anhydride 27.3-28.1, iron scale 34.4-35.3, primary aluminium powder 29.2-30.8, burnt lime 4.8-6.4, fluorspar concentrate 0.8-1.0, evaporation sodium chloride 0.8-1.0. When using charge of the proposed composition, an ignition part of charge is loaded onto the bottom of a tilting crucible and ignited with an ignition mixture; after the melt is built up, electric arcs are ignited and batchwise loading of the main part of charge is performed at current load of 3-5 kA during 25-40 minutes as a penetration process proceeds, and after penetration of the main part of charge and deactivation of electric arcs is completed, a deposition part of the charge is loaded and penetrated. After the melting process is completed, the melt is exposed during 5-10 minutes in the crucible till complete deposition of metal drops; after that, some part of slag is poured into a slag pot to the height of 200-250 mm; slag skull is formed on walls of the slag pan, into which the rest melt is poured for final crystallisation of melting products; the obtained ferroboron block is removed from the slag pan and cleaned from slag.

EFFECT: invention allows finding optimum ratios of the weight of boric anhydride, iron scale, primary aluminium powder, burnt lime, fluorspar concentrate and evaporation sodium chloride so that normal thermal ability of aluminothermic charge is provided, obtaining ferroboron with low content of silicon, carbon, phosphorus, as well as providing high removal of boron to an alloy without any need for processing of metal waste.

2 cl, 2 ex, 1 tbl