METHOD OF PRODUCTION OF CRUDE LEAD Russian patent published in 2006 - IPC C22B13/02 

FIELD: metallurgy of non-ferrous metals; processing lead ore concentrates for production of crude lead.

SUBSTANCE: proposed method consists in treatment of concentrates with alkaline followed by melting; concentrates are loaded into furnace in form of sinter with alkaline in return slag flux at intensive mechanical stirring till magnitude of criterion of foam killing and coalescence of particles of reduced lead reaches n^2.5d= (4.5-5.5)10⁵ (n is rotational speed of stirrer, rpm and d is its diameter, m). Sinter of concentrates with alkaline is obtained at temperature of 220-250°C after preliminary moist preparation of concentrate charge at content of NaOH of 15-50% (of mass of concentrate).

EFFECT: reduced duration of process; minimum effect on ecological system; high degree of extraction of lead.

2 cl, 1 dwg, 1 tbl, 6 ex