Wacker-chemie Gmbh

Messer Griesheim Gmbh

Anton More

Herbert Straussberger

Rudolf Riedle

Willi Streckel

Winfried Lang

Johann Muschi

Albert Tosin

The invention relates to a process for treating elemental silicon and ferrosilicon with slag having the following analytical composition:

Process for treating silicon and ferrosilicon with slag

A process for the preparation of pre-melted, basic welding powder for the submerged arc welding process which consists of preparing two components, one component containing substantially oxidic compounds and maximally 5% by weight of fluoridic compounds, and the other component containing substantially fluoridic compounds and maximally 5% by weight of oxidic compounds, with the total of oxidic and fluoridic compounds corresponding to the desired analytical composition of the powder. Each of the two compounds are melted separately and, the premelted components are cooled. The cooled product is then ground to the desired grain size and thereafter mixed. The welding powders according to the invention are distinguished by a particularly low moisture content.

Process for the preparation of pre-melted, basic welding powders for

The invention relates to a process for the manufacture of basic slags for the electroslag remelting process, with the oxidic components corresponding to the desired composition, which may have a fluoridic content of not more than 5% by weight, and the fluoridic components corresponding to the desired composition, which may have an oxidic content of not more than 5% by weight, being melted separately. The slags manufactured according to the invention have a particularly low moisture content.

Process for the manufacture of basic slags for the electroslag remelting

A casting powder for the continuous casting of steel on the basis of silicate slags having the chemical analysis

Casting powder for the continuous casting of steel and method for

A process of melting down and purifying silicon, which comprises melting silicon in at least half of the amount up to double of the amount of a silicate melt heated by resistance heating up to a temperature of at least 1,420.degree. C., said melt consisting of 2-30% by weight of calcium oxide, 5-35% by weight of magnesium oxide, wherein the sum of calcium oxide and magnesium oxide will be 15-38% by weight, 0.5-28% by weight of aluminum oxide and 45-70% by weight of silicon dioxide, and wherein, to the melt are added at least 0.29% by weight of elementary and/or chemically bound copper, preferably 0.50-3% by weight, calculated on the silicon amount.

Process of melting down and purifying silicon

Molten basic welding fluxes low in manganese and having low moisture sensitivity composed as follows: 10  -   18    % by weight of SiO.sub.2 15  -   25    % by weight of Al.sub.2 O.sub.3 0.1  -   2.0   % by weight of FeO and/or Fe.sub.2 O.sub.3 0   -   8    % by weight of TiO.sub.2 0   -   3    % by weight of MnO 1   -   8    % by weight of CaO 0   -   4    % by weight of BaO 16  -   33    % by weight of MgO 0   -   2    % by weight of Na.sub.2 O and/or K.sub.2 O 0   -   8    % by weight of ZrO.sub.2 15  -   28    % by weight of CaF.sub.2 0   -   1    % by weight of Cr.sub.2 O.sub.3 1   -   8    % by weight of CaO + BaO 25  -   37    % by weight of CaO + BaO + MgO 12  -   22    % by weight of SiO.sub.2 + TiO.sub.2. The invention also relates to a process of making the fluxes. The welding fluxes according to the invention have considerably improved welding properties.

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Burghausen, Germany

Anton More