C - Chemistry – Metallurgy – 21 – C
Patent
C - Chemistry, Metallurgy
21
C
53/36
C21C 1/10 (2006.01)
Patent
CA 1232761
-9- Abstract PROCESS FOR THE PRODUCTION OF CAST IRON WITH SPHEROIDAL GRAPHITE There is disclosed the treatment of an iron melt with metallic magnesium so as to produce spheroidal graphite in the subsequently formed cast iron, which necessarily results in the formation of a slag which contains sulphur. In order to stabilise the sulphur present in the slag, an additive is introduced which acts to prevent re-sulphurisation into the melt. One example of an additive to be used includes CaSi alloy, whereby the sulphur content of the unstable compound (magnesium sulphide) present in the slag is converted into a stable compound, namely calcium sulphide. Therefore, the sulphur in the compound magnesium sulphide that becomes free, in the case of fairly long standing time prior to casting, is prevented from going back into the melt and reacting there with the dissolved magnesium (intended for the spheroidal graphite production) and forming magnesium sulphide again. By the effective "setting" of the sulphur in the slag itself, re-sulphurisation of the melt is effectively prevented. The slag can remain on the melt surface for a longer time, thereby providing a heat-insulating effect, so that longer standing times are possible, which are required in some production techniques.
485858
Brandenberger Urs
Henych Ivo
Hornung Klaus
Menk Werner
Fischer (georg) Aktiengesellschaft
Robic Robic & Associes/associates
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