| 摘要 |
<p>An addition agent for adding an alkali metal or alkaline earth metal to a molten metal bath, for example for the addition of magnesium to a molten iron bath in the production of nodular cast iron in which the graphite is spheroidal in the as-cast condition, comprises briquettes of 5-50 percent by weight of the inoculant metal of a particle size 0.1 to 3 mm., 50-80 percent by weight of a porous material such as semi-coke, coke or graphite, having a particle size of 0.1 to 3 mm., and 10-25 percent by weight of a binder such as coal-tar pitch, coal-tar, or petrochemical pitch or bitumen. The inoculant metal and porous material are first admixed and then homogenized with the binder at a temperature of 80-130 DEG C., after which briquetting is conducted. The briquettes are then heated from 150-250 DEG C. for 15 to 90 minutes to harden them, and may be further heated for that period of time at 250-990 DEG C. to bake them.</p> |
