Abstract： AS 3515.1:2005 pdf download.Gold and gold bearing alloys Part 1: Determination of gold content(less than 30%)—Gravimetric (fireassay) method. 1.5 APPARATLS 1.5.1 Magnesite cupels The choice of cupel size is goerned by the ability of the c...

AS 3515.1:2005 pdf download.Gold and gold bearing alloys Part 1: Determination of gold content(less than 30%)—Gravimetric

(fireassay) method.

1.5 APPARATLS

1.5.1 Magnesite cupels

The choice of cupel size is goerned by the ability of the cupel to absorb lead, and the expected amount of base metal in the Lest

sample. The most commonly used cupel weighs approximately 36 g. and is suitable for up to 7 g of lead. A 54 g cupel is used for

test samples containing a high base metal content, and is suitable for up to 14 g of lead.

NOTE: Magnesite cupel blocks of similar lead absorption capacity are also suitable.

1.5.2 Anvil and hammer Of polished steel.

1.5.3 Analytical balance

Capable of a resolution of 0.01 rng.

1.5.4 Cupellation furnace

Capable of attaining and maintaining a controlled oxidizing atmosphere and a uniform temperature of at least 1100°C ±50°C.

NOTE: A muffle furnace is not a satisfactory cupcllation furnance.

1.5.5 Annealing furnace

Capable of maintaining a temperature of 800°C ±50°C.

1.5.6 Rollers

Constructed of polished steel, capable of reducing the prill to a thickness of 0.2 mm to 0.3 mm.

1.5.7 Parting trays (baskets) Of platinum or fused quartz.

1.5.8 Prill cleaning brush

Having tufts of stiff bristle or nylon.

NOTE: Metal tufts are not satisfactory for this purpose.

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