a metallurgical process for obtaining noble metals of high purity by separating and recovering them from contaminating foreign matter. It is one of the ways of purifying metals.

Methods of affinage are divided into electrolytic, wet, and dry types. Electrolytic methods are used primarily for refining gold and silver; they involve the deposition of the pure metal on a cathode with the simultaneous separation of impurities in the form of sludge. Gold obtained by this method has a fineness of no less than 999.9. The advantage of electrolytic methods of affinage is in the lower cost of the process, the high degree of purity of the metals, the favorable working conditions, and the possibilities of obtaining metals in the platinum group as by-products by the addition of chemical reagents to the depleted electrolyte.

Wet affinage methods are used to obtain platinum, palladium, iridium, rhodium, and other metals of this group in a complex manner by dissolving the metals in aqua regia and subsequently separating them out of the solution with various reagents (such as ammonium chloride, ammonia, or sugar).

Dry gold affinage methods involve the treatment of the molten metal generally with chlorine. All the base metals then form chlorides and are volatilized, but silver chloride rises to the surface of the pure, molten gold. The fineness of the gold is 996.5, and the fineness of the silver (when recovered from the chloride) is 999.0.


Plaksin, I. N. Metallurgiia blagorodnykh metallov. Moscow, 1958.
References in periodicals archive ?
The Cellars were constructed for the purpose of providing affinage, or aging expertise, as well as distribution and marketing services for local cheesemakers so that they may access the burgeoning market for artisan cheese nationwide.
The affinage process has become very important to us.
We're constantly working on improving our affinage.
From such activities Republic loses control over accounting and the movement of mined and processed raw materials and also contributes to the loss of profit from value added in the case of deep processing and affinage of gold in the country.
The French practice of affinage means that particular cheeses are ripened in optimum conditions to ensure that the cheese reaches the customer in perfect condition.
Les figures 4A et B referent au secteur manufacturier a faible valeur ajoutee, secteur qui, pour les fins de l'etude, comprend egalement des secteurs lourds << traditionnels >> comme les pates et papiers et la fonte et affinage de l'aluminium.
Within hours Artisanal will fulfill your request, directly from five custom-designed cheese aging caves masterminded by the Artisanal Affinage staff.
He will also continue his work as a leading writer, speaker and authority on artisanal cheese as part of a broader campaign by Artisanal to educate consumers on its brand of affinage cheeses.
McCalman oversees Artisanal's affinage process, a centuries-old method of aging cheeses to peak ripeness.
Flavors, affinage, and ingredients added to the pastes varied not only from region to region, but from village to village and even home to home.
NEW YORK -- American Home Food Products' (OTCBB:AHFP) wholly-owned subsidiary, Artisanal Cheese, LLC entered into an agreement with American Express Publishing Corporation to promote the Artisanal brand of affinage cheeses as part of a new American Express Departures Magazine Wine Reserve Club offering.
They thrive in this elevage stage for several years until they are moved to the affinage or "finishing" stage to mature to one of the culinary world's most venerated oyster species.