| 摘要 |
<p>Magnesium and magnesium alloys contaminated by calcium are refined by stirring the molten metal with a highly fluid flux consisting of or containing a substantial proportion of magnesium chloride, e.g. carnallite, at temperatures below 900 DEG C. and towards the end of the refining treatment adding to the mixture, while continuing the stirring, an inspissating agent such as a metal oxide and/or fluoride, e.g. magnesium oxide and/or fluoride, in quantities sufficient to bring about thickening of the highly fluid flux. If, after the treatment above, it is desired to superheat the metal before pouring, the stirring is discontinued and the surface of the melt covered with a mixture of flux and inspissating agent. The melt is then superheated, cooled down to the pouring temperature and then cast. Specification 219,287, [Class 82 (i)], is referred to.</p> |
