Refractory Gold and Silver Fire Assay Magnesia Cupel Crucible

• Refractoriness (℃): 1580< Refractoriness< 1770
• Feature: Long Time Materials
• Type: Refractory Material
• Shape: Brick
• Material: Bone Ash
• Size: 6A, 7A, 7as, 7al, 8A and 9
• Transport Package: Carton Box
• Specification: customized
• Trademark: Yosion
• Origin: China
• HS Code: 6903900000
• Production Capacity: 1000000 PCS/Year

Product Description

Cupellation is the last and most important step in fire assay process and as such, the quality of cupel is extremely crucial.

During cupellation, the lead is oxidized to litharge (PbO), most of which is absorbed by the cupel. Gold, silver, platinum and other precious metals form a bead in the cupel. The bead is subsequently treated to determine its precious metal content .

Cupels are typically made from magnesia MgO (sometimes mistakenly referred to as magnesite), bone ash, Portland cement and other materials.

Typical cupellation furnace temperatures in gold and silver assays are 900-1000°C, but can vary with technique, air flow volume and cupel material.

Yosion aims to manufacture cupels with followings:
Robust mechanical strength.
Not affected by atmospheric changes.
No spitting of lead.
Rapid absorption of large quantity of litharge.
Free from cracking and pitting.
Beads are easily removable.
Perfect uniformity of quality.
Reduced tendency to freeze.
Consistently low losses.
Regularly tested in our own assay lab. Manufactured with unique blend of Magnesium Oxide and special fluxing ingredients.

Available sizes are: 6A, 7A, 7AS, 7AL, 8A and 9.
 
Customized sizes and services are also available.
 

Technical Parameters:

 

Size	Outer Dia mm	Cup Dia mm	Base  Dia m m	Height   of Cupel  mm	Depth  of Cup  mm	Height   of Ridge mm	Net Weight g	Nos Per carton	Carton Dimension cm
	D	D1	D2	H	H1	H2
2x	24	18	19	17	8	4.5	13	1040	34x22x22
3	26	23	20	20	5.5	8	17	864	34x22x22
4	29	24	23	22	6	8	20	486	30x30x15
5	35	27	26	26	8	6.5	35	378	34x22x22
6A	40	30	30	26	12	6	62	200	34x22x22
7A	40	30	30	32	12	10	72	200	34x22x22
7AS	40	32	30	32	15	10	62	200	34x22x22
8A	45	38	37	35	13	13	103	200	38x24x21
8AM	45	33	37	35	12	15	110	200	38x24x21
9	51	40	43	30	11	5	120	120	34x22x22
9A	51	40	39	34	15	14	123	120	34x22x22
11	56	46	46	37	14	11	166	100	34x22x22 30x25x22
Z27	27	23	27	23	10	/	29	500	30x30x15
Z40	40	32	40	30	15	/	73	200	34x22x22

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