DOUBLE-WALL REFLECTING FURNACE WITH FOREHEARTH FOR REMELTING OF ALUMINUM SCRAP Russian patent published in 2019 - IPC F27B3/00 

FIELD: furnaces; metallurgy.

SUBSTANCE: invention relates to double-reflecting furnace with forehearth for remelting of aluminum scrap. Furnace comprises housing formed by refractory outer side, front and rear end walls, two storage baths and two inclined platforms, limited by hearth and walls, two vaults, two drain tap holes, two swivel bowls with welded chutes, gas duct and welded frame, on which all is arranged. Stainless steel box with heat insulation between it and each wall, which consists of double heat-insulating mullite glass-fiber layer and sheet asbestos cardboard, is welded to the furnace frame. Two storage baths and two inclined platforms are made of corundum blocks laid on heat-insulating mullite glass-fiber layer and light-weight brick. Furnace frame is filled with concrete with filler from crumbs of light-weight chamotte bricks. Arches above inclined platforms and baths of furnace have heat-insulating coating on top of which double heat-insulating mullite glass-fiber layer is laid. Furnace has in each side wall two medium-pressure two-row sixteen-mix injector burners, one of which is directed at an angle to inclined platform and at an angle to furnace axis, and the other is directed at an angle to furnace bottom and at an angle to furnace axis, wherein inclined medium-pressure two-row sixteen-mix injector burner is directed at each inclined platform at an angle, installed in furnace roof, two afterburning chambers lined with refractory brick, in each of which there is a gas two-mix injection burner, and two air blowers, two flanges in rear wall for discharge of molten metal into a forehearth, made in quick-replaceable scrap brick. Furnace forehearth includes a housing formed by fire-resistant external side, front and rear end walls, a bath limited by a hearth and walls, a roof, drain tap holes and a gas duct, wherein forehearth housing is placed on welded frame filled with concrete with filler from crumb of light-weight chamotte bricks, wherein for baths is made of corundum blocks, laid on three layers of asbestos cardboard and packing from dry quartz sand, to forehearth frame welded steel box, equipped with heat insulation between it and each wall, consisting of chamotte, double layer of sheet asbestos cardboard, fireproof wool, in forehearth front burner wall inclined at an angle to hearth there is a sixteen-mix injection medium-pressure burner, in the side wall there is a slag window, and in the rear wall there are two rotary chutes.

EFFECT: providing high efficiency of the furnace, reduction of heat and loss losses and possibility of ecologically pure remelting of aluminum scrap.

8 cl, 11 dwg