DE242455C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- M 242455 CLASS 80 b. GROUP

The previous processes for the production of melt fluxes from aluminum oxide, from SiIiciumoxyd (Quartz sand or rock crystal) and the like suffer from that which is difficult or difficult to remove Circumstances that the air or entrapped in the crushed oxides Gas bubbles cannot be removed from the molten material. The ones to melt required heat is consistently provided by the

ίο electric current or by the oxyhydrogen blower or delivered by the cooperation of both.

The inventor was now to remove the air remaining in the pores on a chemical Proceedings conducted. The reason for this was a smelting process, according to which oxygen is introduced into the molten pig iron and the contained therein Impurities such as silicon phosphorus, etc. have been oxidized by the supplied oxygen. Similarly, the inventor has in removing the gas bubbles from the melting Quartz or aluminum oxide tried to proceed. To which mainly from oxygen and nitrogen to remove existing gas bubbles, one mixes the quartz sand or the lumpy or granular rock crystal silicon powder. When heating the mixture the powdered silicon combines with the oxygen to form silicon oxide, the is also melted, and to silicon nitrogen, which is precipitated.

In the same way, something powdery is added when aluminum oxide is melted Aluminum contributes to the material to be melted, so that aluminum oxide and aluminum nitrogen can form and any blistering. dung is prevented.

The working method described above can also be designed as follows: An oxygen jet is blown into molten silicon, which combines with the silicon to form silicon oxide and develops so much heat that the temperature until the silicon oxide melts, approximately between 1700 to 1850 ⁰ and even above increases. But since higher temperatures impair the quality of the melt flow and prevent a clear, transparent product from being obtained, one must prevent the temperature from rising beyond these limits by adding pieces of rock crystal or quartz sand. The silicon is expediently melted in a melting furnace which can be heated electrically or by an oxygen blower.

Like silicon, aluminum can be treated in exactly the same way, although this is more difficult as the aluminum evaporates more easily.

Finally, you can also use flammable compounds such as silicon ethyl, silicon methyl, Burn aluminum ethyl etc. with oxygen and so the oxides of silicon that are formed or aluminum merge in the same way to form transparent melt flows permit. This is also the case with this way of working

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a lot of excess bonding heat is released so that the added oxides melt with it.

Claims (3)

. Patent Claims: i. Process for the production of melt fluxes of difficult to melt oxides, thereby characterized in that the oxides to eliminate the gas bubbles respective metal or metalloid, such as silicon in the case of silicon oxide and silicon in the case of Aluminum oxide admixes the aluminum. 2. Embodiment of the method according to claim i, characterized in that oxygen is blown into the molten metalloid or metal and the relevant Adding oxides. 3. Embodiment of the method according to claim 2, characterized in that instead of the metalloids or metals, combustible compounds are used, such as B. silicon ethyl, aluminum ethyl and the like