The action or process of calcining; reduction by fire to a ‘calx’, powder, or friable substance; the subjecting of any infusible substance to a…

The process of reducing to a calx, burning to ashes, or subjecting to a roasting heat.

Metallurgy. The action or process of separating metals by fusion.

Metallurgy. The sudden production of a bright appearance in a metal during refining. Cf. fulguration, n. 2. Obsolete.

= cupellation, n.

The action of decrepitate, v.: (a) the calcining of a salt or mineral until it ceases to crackle with the heat; (b) the crackling and…

Metallurgy. Iridescence or brightness shown by a metal during refining, esp. that of silver during cupellation, when only a thin film of lead oxide…

The extraction or separation of gold, silver, or other metal present in an alloy, solution, etc. Now rare.

The process of assaying or refining the precious metals in a cupel; the separation of silver from argentiferous lead, on a large scale, on a cupel.

The process of reducing to scoria; formation of scoria or slag; spec. as a method of refining or assay.

Metallurgy. The process of refining (precious) metal, esp. by treatment with hot concentrated sulphuric acid.

the reduction of finely divided oxides of iron or other metals by means of an exothermic reaction with finely divided aluminium; also, thermite…

= zone refining n. below.

a method of refining used to produce semiconductors and metals of very high purity by causing narrow zones of molten material to travel slowly…

a process similar to zone refining in which the molten zone is passed repeatedly to and fro to produce a more homogeneous material.