METHOD AND INSTALLATION FOR METALLOTHERMIC METHOD OF ALKALINE-EARTH METALS RECEIVING Russian patent published in 2008 - IPC C22B26/20 C22B5/04 

FIELD: metallurgy.

SUBSTANCE: invention concerns methods and facilities for receiving alkaline-earth metals during the process of its recreation, and specifically method and facility for metallothermic receiving of alkaline-earth metals. Method includes charging into furnace bricks, received by compound pressing from powder of alkaline-earth oxide and metal reductant, bricks heating till reduction temperature, reconditioning of alkaline-earth metal oxide, cooling and discharge of reconditioned metal condensate and waste bricks. Bricks heating from the temperature of discharging it into furnace till the temperature of reduction temperature is implemented at two stages: at the first stage - in air or inert atmosphere till temperature 400°C at vacuum 10¹-10² kPa, with further soaking, at the second till reduction temperature at continuous exhaust of furnace useful capacity. Reconditioning is implemented at temperature till 1600°C and pressure which is not higher then 10 Pa. Cooling of reconditioned metal condensate and bricks is implemented in inert atmosphere of furnace, firstly at cooling them till temperature not higher then 1000°C, at achieving of which it is implemented discharge of waste bricks, and then till temperature not higher then 400°C for extraction of reconditioned metal condensate. Before the extraction of condensate into furnace inert atmosphere it is added insulating gas. Facility is outfitted by rotating in horizontal plane unit for discharging of waste and charging of initial bricks, which are able for vertical displacement, and by rotary relative to horizontal axis valve for overlapping of useful capacity of pot heater at the moment of pot discharge. Heating electric furnace is located vertically and stationary and outfitted by divided bottom hemispherical cover, in central divided part of which it is charging stage for installing on pot on it. Inside of cover and concentric to stage it is located movable platform for installation at it an internal heat insulation. At that pot heater of furnace is outfitted by thermal shield with central hole for vapors of reconditioned metal located between pot and condenser. Heater, covering pot is fixed on input leads. Bodies of heating pot and covers are hollow, and installed on top cover of electric furnace water-cooled condenser is outfitted by extract insertion piece for condensation on it vapors of reconditioned metal and implemented as detachable with divided cooling cover. Heater, charging stage for pot and internal heat insulation are made of carbon- carbonic composite materials, and pot - carbon-base material or silicon carbide.

EFFECT: increase in productivity of process.

14 cl, 4 dwg