Skw Trostberg Aktiengesellschaft

Suddeutsche Kalkstickstoff-werke Aktiengesellschaft

Alfred Freissmuth

Heinrich Rock

Walter Meichsner

Werner Gmohling

Erich Pfluger

Heinrich Rellermeyer

Wolfgang Ullrich

Horst Prietzel

Raymund Sindermann

Werner Gmoehling

Heinrich Roeck

Peter Kniep

Walter Heinl

Herbert Knahl

The present invention provides a desulphurizing agent, especially for iron melts, based upon calcium carbide and diamide lime, wherein it contains a diamide lime which has been post-treated by flotation or air sifting. The diamide lime used preferably contains 18 to 40% of free carbon.

Desulfurization agent

Process and composition for desulfurizing pig iron in which the desulfurization agent consists essentially of calcium carbide, a gas-evolving component and fluorspar; the advantage of the process and composition is that it reduces dust pollution and danger of flaming in the handling of the slag after the desulfurization of pig iron.

Desulfurization mixture and process for desulfurizing pig iron

Improved desulfurization of ferrous melts is obtained by injecting into the melt a readily-flowable desulfurization composition composed of a desulfurization agent, such as calcium carbide or the like and, if desired, an additional component in which the particles are finely ground with about 3 to 20% by weight of carbon for at least about five minutes to coat the particles with a solid, lubricating coating of carbon.

Desulfurizing composition, process for producing them and

A method for treatment of iron melts by blowing in oxygen or an oxygen containing gas with calcium carbide on top or into the iron melt. Using the process, the amount of iron scrap added to the melt can be increased, foaming is avoided and the temperature of the melt can be controlled.

Process for the treatment of iron melts and for increasing the scrap

Desulfurization of iron melts with alkaline earth metal containing carbidic or metallic materials by introducing the desulfurizing agents in a finely divided form with a consumable gas causing an exothermic reaction in an iron melt.

Desulfurization of iron melts

Molten metals, especially molten pig iron, are desulfurized by contacting them with a composition comprising calcium carbide or calcium cyanamide and an additive agent yielding water or hydrogen at the temperature of the molten metal; preferred as the additive agents are the alkali metal hydrides, polyethylene or polyamide for yielding hydrogen and hydrate of lime and alkaline earth borates for yielding water.

Method and composition for the desulfurization of molten metals

Finely granular desulfurizing agents for iron melts, consisting of at least one alkaline earth metal carbonate and at least one reducing metal carbide and optionally a reducing metal or an alloy thereof, are outstandingly effective in desulfurizing action and, based on the high degree of utilization of said agent, increase the amount of slag formed only to a negligible degree.

Composition and method for the desulfurization of molten iron

Compositions for desulfurizing iron melts comprised of alkaline earth metal carbonates, such as calcium carbonates, and reductive metals, such as silicon alloys, and a process for desulfurizing iron melts therewith.

Desulfurization of iron melts with fine particulate mixtures containing

Iron melts, particularly iron melts made by the torpedo ladle method, can be efficiently desulfurized by adding thereto a mixture of calcium carbide and diamide lime wherein the content of diamide lime is from 40 to 70% by weight of the desulfurizing composition.

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Trostberg, Germany

Alfred Freissmuth