DE509307C - Melting kettle for crystallization processes - Google Patents

Description

Melting kettle for crystallization processes is the subject of the invention is a device, uni multicomponent alloys based on the principle of complete To separate crystallization and to clean raw metals from interfering elements, z. B. to smelt white metals on mixed tin, to deflead and around raw metals by themselves or after the addition of other metals from troublesome metal impurities clean up zti.

The novelty of this device lies in the shape of the melting kettle. Description _ Will the above work be carried out in ordinary, uniformly insulated melting vessels of hemispherical or cylindrical shape, these aggregates are according to the Tapping of the lead-rich parts (or after the hardened raw metal has expired) up to half empty and still further in its lower part. The incipient melting out the middle alloy goes without problems with suitable underfiring and without special Boiler stress in front of you. The middle alloy drips off into the empty bottom Part that is hotter in and of itself and runs to open tapping. The completely solidified, hard cover, consisting of the elements Fe-Zn - ('ti-Sn-Sb-Al etc. and Their connections require great heat to melt thinly.

Since the lower part of the boiler is empty, the upper part is full of difficult-to-melt parts Is metal, such melting is associated with high fuel consumption; Overvoltages and heavy scaling of the iron impair the service life this, after all, expensive apparatus. The new shape of the melting kettle bypasses the melting out of the final alloys and at the same time has an improving effect the segregation process.

Because the end product after cooling and tapping the specific heavy alloys or metals is always present in metallic form, is at the With the new kettle shape, it is no longer necessary to melt the end products.

The new boiler has a lower cylindrical and an upper conical one Part. The upper part is smeared with a layer of clay as thick as a finger and then afterwards your melting brought the contents to cool. When turning off the furnace an iron support cross is pressed into the upper conical part and fastened, who has to go through the cooling process. All around the insert frame sits on the At the end of the process, the hard metal layer, which is mechanically lifted, smashed will.

The demixing process itself is refined by this kettle shape: When the kettle has an abundant expansion upwards, i.e. the metal bath has a much larger surface area than the rest of the kettle cross-section, and the kettle contents now slowly cool down, i.e. specifically lighter, highly fusible alloys or alloy mixtures are removed specifically heavier, lower-melting alloys separate, in_ the former. If you move upwards, the latter downwards, in practice it has been found to be a very important advantage that the alloys moving upwards found a larger space and could be distributed more comfortably, more easily and in a much thinner layer, the following alloys in the same amount In other words, the way from top to bottom was made much more convenient for the specifically heavier alloys, so that according to this principle the hard crust was much smaller, lighter, thinner and especially less lead - below t% Pb - - that is, in this kettle shape, defleading is guaranteed up to the technically extreme limit. In the case of a non-expanded bowl shape (7 cylinder), the rising crystals are severely hindered by the compounds moving downwards and delay and block the buoyancy of the subsequent crystals, especially since the entire alloy is in the slow cooling phase.

Advantages of the new kettle shape: Longer life of the kettle, significant Fuel economy, significant shortening of the process, lower-lead end products below i ° / a Pb, higher yield of lead-rich tin alloys, no melting out of the final alloys.

Claims (1)

PATENT CLAIM: Melting kettle for crystallization processes, thereby characterized in that it consists of a cylindrical lower part and an upward one conically flared upper part.