Hoechst Aktiengesellschaft

Wilhelm Portz

Joachim Kandler

Georg Strauss

Klaus Komorniczyk

Albert Braun

Hans-Dieter Thiel

Joachim Stendel

Gunther Moormann

George Strauss

Horst Witt

Heinrich Weiler

Johann Cziska

Granular compositions containing pulverulent magnesium are made by blending the pulverulent magnesium ingredient with the desired other ingredient(s). To this end, a premix is formed by mixing, in a first stage, the pulverulent magnesium with the other ingredient(s) in a ratio by weight of 4:1 to 1:19; and intimately mixing this pre-mix, in a second stage, with further proportions of said other ingredient(s) giving a total ratio by weight of 1:799 to 1:19.

Production of granular compositions containing pulverulent magnesium

An iron melt is desulphurized. To this end, the irom melt is admixed with a powder mixture comprising metallic magnesium and at least one calcium compound, the latter being selected from calcium carbide, calcium oxide, calcium carbonate and dolomite, and the said calcium compound being used in the form of particles with a size of 0.06 to 3 mm, wherein the powder mixture contains 0.1 to 2.5 weight % of metallic magnesium in the form of particles having a size of 0.060 to 0.095 mm.

Desulphurization of an iron melt

Pellet-shaped calcium hydroxide forming part of the mixture of flux and ores in electrothermal calcium carbide furnaces is calcined. The pellets are made by granulating or briquetting moist calcium hydroxide, delivered to a sintering grate and conveyed thereon through a heating zone, wherein high temperatures are produced by the combustion of gas, above the grate, and wherein the combustion gas is exhausted, below the grate. The calcium hydroxide pellets are more especially placed on to the grate, covered with a layer of broken limestone and the undried pellets are directly conveyed through the heating zone, in an apparatus for carrying out the process.

Process for calcining pellet-shaped calcium hydroxide

The invention provides the use of an iron/silicon/phosphorus-alloy containing between 8 and 25 weight % of silicon and between 0.3 and 2.5 weight % of phosphorus as heavy medium for making heavy pulps for the heavy media separation of minerals.

Use of an iron/silicon/phosphorus-alloy in separation of minerals

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Erftstadt, Germany

Wilhelm Portz