The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 22, 1986
Filed:
Jul. 23, 1985
Urs Brandenberger, Dachsen, CH;
Ivo Henych, Schaffhausen, CH;
Klaus Hornung, Stein am Rhein, CH;
Werner Menk, Schaffhausen, CH;
Georg Fischer AG, Schaffhausen, CH;
Abstract
A process for the production of cast iron containing spheroidal graphite is disclosed. In the process, the iron melt, which contains sulphur, is treated with metallic magnesium, forming unstable MgS as a by-product. By the addition of CaSi, the sulphur contained in the MgS present in the slag is converted into stable CaS. As a result, the free sulphur which is released upon decomposition of MgS when the melt is allowed to stand for a fairly long time is prevented from going back again into the melt, reacting there with the dissolved magnesium, and forming MgS once again. Through the stabilization of the sulphur in the form of CaS in the slag itself, resulphurization is effectively prevented. The slag can remain on the melt surface for a longer time than hitherto. The slag provides a heat-insulating effect, so that even longer standing times which are possibly required in certain production processes, can be utilized.