ORE-THERMAL FURNACE WITH HOT HEARTH AND HIGH-CURRENT LEAD Russian patent published in 2015 - IPC F27B3/10 H05B7/144 C22C29/00 

FIELD: metallurgy.

SUBSTANCE: ore-thermal furnace comprises: a transformer with low voltage (LV) inputs and outputs, connected by current leads to an electric contact clamp of a reversible-movable electrode and an external electric contact terminal of a hearth electrode, with a lined furnace bath arranged on top of the hearth electrode of the carbon current-conducting hearth, installed into a tight metal jacket and closed with a vault. The furnace is equipped with an electroconductive heat insulation layer (ECHIL) arranged between the hearth electrode and the carbon current-conducting hearth, made of electroconductive support columns from graphite or silicified graphite of a cylindrical, square or plate shape arranged in concentric rows or in a staggered order with the space filled between the specified columns with a material inert in respect to them, such as soot, finely dispersed powdered graphite or boron carbonitride.

EFFECT: intense and even melting of refractory materials due to heating with an electric arc on top from an electrode, and at the bottom - with a hot hearth, and creation of technological conditions for the use of low-quality traditional raw materials in melting, as well as non-traditional raw materials and recycled wastes with the possibility to produce products of a required quality.

4 cl, 1 dwg