Magnesium and calcium composite
AssigneeThe Dow Chemical Company
InventorWilliam G. Green
Life of this patent
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Abstract
A product and method of manufacture are set forth. The product is used in desulfurizing steel. Magnesium is in its molten state, and with vigorous stirring, a reactant, such as CaC.sub.2 is added. A relatively brittle material is obtained upon cooling which can be ground to a particulate form and used in steel desulfurization. The composite is both a mixture of magnesium and reactant, such as CaC.sub.2, and also includes Mg.sub.2 Ca alloy.
Claims17
A method of manufacture of an injectable particulate composite for molten ferrous metal comprising the steps of:
- (a) obtaining a specified weigh of magnesium in a molten state at a temperature above about 715.degree. C.;
- (b) adding dolime, CaAl.sub.2 O.sub.4, Al.sub.2 O.sub.3 or CaC.sub.2 as a reactant to the magnesium accompanied with mixing and continuing until sufficient reactant has been added that a specified ratio between magnesium and reactant has been achieved and mixing has occurred;
- (c) cooling the mixture to solidify and form a precipitant alloy;
- and
- (d) crushing the cooled precipitant alloy to particulate form for subsequent injection into molten metal.
A method of preparing a magnesium based material comprising the steps of:
- (a) melting in a container a predominantly magnesium alloy at a temperature above about 715.degree. C. sufficient to obtain melting;
- (b) distributing particulate calcium carbide through the melted magnesium sufficiently until particulate clacium carbide is dispersed through the melted magnesium and thereby forming Mg.sub.2 Ca precipitant;
- and
- (c) casting the melted material to a specified shape by cooling.
A composition of matter suitable for injecting into molten ferrous metal, the composition of matter consisting essentially of magnesium and calcium carbide mixture in particulate form and including Mg.sub.2 Ca as a precipitant.
Dependencies are inferred from the claim text.