| 摘要 |
For the production of cast iron with a vermicular graphite structure (GGV) in a converter it is suggested to desulphurize an initial melt by means of a treatment by pure magnesium and at the same time to treat the melt with magnesium, so that the end analysis shows a proportion of magnesium to sulphur from 0.8 to 2.5. Experience has shown that the desulphurization and the alloying by means of pure magnesium are less costly than the use of magnesium prealloys and that an exact production of GGV, thereby, is made possible. It is not necessary to use titanium, that is known for its disadvantageous side effects. It is, if required, any time possible to change from the production, of GGG to GGV or vice versa, since a charge of the initial analysis, except for the lower remnant magnesium content, is not necessary and, therefore, a separation of the circulating material is not required. The invention also relates to an apparatus for performing the above treatment. The apparatus comprises a tiltable treatment container having a reaction chamber situated in the bottom corner area of the container, a closeable opening in the chamber for supplying pure magnesium in the wall of the container, a closure in the top of the treatment container when it is in vertical position and openings in the reaction chamber through which the specified iron melt can penetrate to react with the material in the chamber. |
