mischmetal

Mischmetal is a group of iron-free alloys of rare-earth elements, with a composition that can vary significantly depending on the mining source and refining process. Typically, mischmetal consists predominantly of cerium and lanthanum, with smaller amounts of neodymium, praseodymium, and other rare earths. The exact proportions are not standardized, leading to the name "mischmetal," which is German for "mixed metal."

Historically, mischmetal was primarily produced from monazite sand, a phosphate mineral rich in rare-earth elements. The process involved separating the rare earths from thorium and other impurities. Modern production methods have diversified, utilizing various rare-earth ores.

The most well-known application of mischmetal is in the production of flints for lighters and matches. When struck against steel, mischmetal produces sparks due to its pyrophoric nature, meaning it ignites spontaneously in air when finely divided. This property makes it highly effective for ignition purposes.

Beyond flints, mischmetal finds use as an alloying additive in various metallurgical applications. It is added to steels to improve their malleability and resistance to oxidation. In magnesium alloys, it acts as a grain refiner, enhancing mechanical properties. Mischmetal is also employed in the production of certain types of glass and as a desulfurizing agent in the iron and steel industry. Its reactivity and the unique properties of rare-earth elements contribute to its diverse industrial roles.