Refractory Gold and Silver Fire Assay Bone Ash Cupel Crucible
China Refractory Gold and Silver Fire Assay Bone Ash Cupel Crucible, Find details about China Cupel, Ceramic from Refractory Gold and Silver Fire Assay Bone Ash Cupel Crucible
Basic Info.
Trademark
Yosion
Transport Package
Carton Box
Specification
customized
Origin
China
HS Code
6903900000
Trademark
Yosion
Transport Package
Carton Box
Specification
customized
Origin
China
HS Code
6903900000
Product Desciption
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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