DE58956C - Process for the production of a carbon electrode from individual carbon plates - Google Patents

Description

IMPERIAL

PATENT OFFICE

PATENT LETTERING

CLASS 40: Metallurgy.

Patented in the German Empire on April 11th, 1874.

The invention relates to a method for producing positive electrodes in electrometallurgical Apparatus consisting of a number of. Coal plates are made that way are firmly connected to each other so that they are destructive to all during use Resist the influences.

The carbon electrodes previously used in electrometallurgical apparatus consist of either from individual carbon plates placed on top of one another, which are mechanically firmly pressed together, or from a single solid piece of coal.

In the former type of composite electrode, it occurs often, that due to the high temperature to which it is exposed, as well as due to other influences, to which they are subject to break off individual panels of various lengths, these pieces in the melting pot, in. that the electrode is immersed, fall, thereby causing a short circuit and thus the electrical effect inhibit; In addition, the electrical contact of such plates is imperfect.

Such a damaged electrode functions poorly and irregularly, so that it passes through a new one must be replaced, which is often subject to the same malfunctions in a very short time.

In the case of electrodes, which are made from a single solid piece of carbon, yields the inconvenience that the small, often imperceptible transverse cracks, which are in thick pieces the retort carbon are always located, at high temperatures always the cause of the Breaking off the coal will be.

The new method now consists in laying a number of thin plates on top of one another and to cement them together in such a way that the abovementioned evils are removed.

These individual plates are made from pulverized retort carbon in a known manner and after drying respectively. Burn them in any number by means of one suitable paste connected to one another to form a compact, solid carbon electrode.

Such a very good paste is made from fructose syrup with the addition of approx. ίο pCt. Dextrin or gum arabic. A mixture of hot tar and finely powdered coke is also very suitable for such a putty.

Depending on whether you now produce an electrode with a larger or smaller surface want, a number of carbon plates with putty in between are put into a cast-iron one Brought a vessel and place it in a suitable oven very gradually exposed to increasing heat up to red embers. The cooling must also be gradual be.

After cooling, each of these bundles of plates is a solid, compact piece of coal melted together and a completely flawless carbon electrode for metallurgical Purposes.

If there is a transverse rifle in a single plate, it cannot apply to any If a piece falls off, the riff is partly filled by the paste, and also all side surfaces of one plate connected to those of the other plates by means of cement are. This type of connection also makes it a completely good electrical one at the same time Contact established between the individual plates that form the electrodes.

Claims (1)

Patent claim: Process for the production of a coherent carbon electrode from individual Carbon plates consisting of a number of carbon plates with one made of carbonaceous Substances existing putty coated, placed on top of each other and one gradually until the red glow heat increasing exposure to heat. For this purpose ι sheet of drawings.