SU81118A1 - The method of electric smelting refractory oxides - Google Patents

Description

Usually the melting of refractory oxides, having a tem perature of hmavleni about 2000 ° and. above (for example, A12Oz512 and ir), is produced either in furnaces with a coal heating element, or in furnaces with a Petrov section, burning between the carbon electrodes. However, many oxides cannot be melted without decomposition, for example, trivalent zhelezia, chromia, oxides, 1, coba.lt oxide, magnesioferrite, and other refractory oxides and compounds that react with carbon at high temperatures. Most of these oxides become electrically conductive when heated to 500-1000 °. Thanks to this, I may be able to melt fire oxides, preheat them beforehand, and then pass electric current through them.

A feature of the proposed method of electrofusion of refractory oxides is that of them npeccyjoT plates, which, after calcination at 1200 °, are clamped between the electrodes. As a result, the smelting of oxides is obtained much more evenly than with the use of AND of a single whole pressed pressed image. The preliminary heating of the column by spiral from outside is brought to a temperature of about 1000 °.

The scheme of the proposed apparatus for electric melting of oxides of oxides in the drawing.

The material to be pressed, pre-crushed at 1200 ° C, is compressed into plastics plates, the size of which is determined by the installation capacity. The plates are folded into a solbic and clamped by a load 2 between two massive metal current-carrying electrodes 3. Before the electric heating of oxides by an electric current passing through a column between electrodes 3, the plates are heated to 800-1000 ° from the electric coil 4 located in the furnace 5. Melting the body of oxide is uneven and incomplete, while the "composite load is melted at the points of contact of the plates laid one on another and the fused block 90-95% consists of fully melted eys mass.

Subject invention

The method of electrofusion of refractory oxides, crushed, burned and burned by passing through them the electric current after their preheating from the electric spiral from the outside, rt, 1 and h and S1; and with the fact that the oxide; 1y is pressed in the form of ilas, burned at 1200 ° and 11 meters between electrodes, folding the plates in the form of a column, and the flow of electric current through them begins after preheating the column to a temperature of about iOOO °.

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