Fire Assay

magnesite cupel
magnesite cupels
ash cupel package
magenesite cupel warehouse
magenesite cupels in cupellation
magnesite cupel
magnesite cupels
ash cupel package
magenesite cupel warehouse
magenesite cupels in cupellation

Magnesia Cupel

Qingdao Decent Group cupel is a shallow, porous crucible with approximately 96% magnesia. It is especially used to separate gold, silver, and precious metals from lead buckles in the process of Pb-Fire assay. By using high-quality raw materials and scientific formulas, Qingdao Decent Group's fire assay magnesia cupel has a smooth surface, high mechanical strength, and will not crack and pit during high-temperature cupellation.

Product Details

Manufacture high-quality fire assay cupels with a 96% magnesia content

Cupellation is the second and most important step in the fire assay process. Therefore, the quality of the cupel is crucial. Qingdao Decent Group aims to manufacture a full range of fire-assay cupels with premium quality and competitive cost.

Our magnesia cupel uses high-quality raw materials and a unique formula. And its composition includes up to 96% magnesium oxide and special flux. Our magnesia cupel absorbs more lead oxide than ordinary bone ash cupels. So our magnesia cupel has strong mechanical strength and perfect quality uniformity.

In the process of cupellation, the magnesia cupel will not cause splashing of lead, and can quickly absorb a large amount of lead oxide. And the magnesia cupels will not crack and pit. After the cupellation process, the gold-silver particles in the cupel can be easily removed.

Our magnesia cupels can be stored for a long time without compromising quality. It does not require pre-drying for the first use and always maintains a low loss of gold, silver and precious metals. What's more, our fire assay cupels are regularly sample tested in our own laboratory to ensure that we always provide our customers with quality cupels.

[ Key Advantages ]

• High quality, perfect uniform appearance, smooth surface

• High mechanical strength • High thermal shock resistance

• Rapid absorption of lead oxide, low loss of gold and silver

• No lead spatter, no cracks, no pitting

• Easy to remove beads

• Customized according to customer needs

[ The Process of Cupellation ]

Cupellation is the second step of the fire assay process. During cupellation, put the lead button which formed in fusion into the cupel, and melt it at 900 degrees Celsius in the cupellation furnace. The molten lead contacts with the oxygen in the air to become lead oxide. Due to the effect of surface tension, most of the lead oxide is absorbed by the porous cupels, and a small part of the lead oxide is volatilized. Gold and silver are not oxidized, but become alloy particles and remain at the bottom of the cupel, awaiting the next gold separation treatment.

[ Technical Parameters ]

cupel and drawing index

Model No. Top OD
(mm)-D
Top ID
(mm)-D1
Base OD
(mm)-D2
Height
(mm)-H
Depth
(mm)-H1
Height of Ridge
(mm)-H2
Weight
(g)
Pcs/Carton Carton Dimension
(cm)
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
4A 27 24 20 22 6 7.5 17 864 30x30x15
5 35 27 26 26 8 6.5 35 378 34x22x22
6A 40 31.2 30 26/29 11.8 6/9 62/65 200 34x22x22
7A 40 31.2 30 32 11.8 12 72 200 34x22x22
7AS 40 31.2/32 30 35/32 11.8/15 15/12 70.45/62 200 34x22x22
8A 45 38 37 35 13 13 98.3 200 38x24x21
8AM 45 33 37 35 12 15 103.4 200 38x24x21
8 44.3 34.2 34.6 27.1 8.5 9 106 200 38x24x21
8S 44 38 34 40 14 13 112 200 38x24x21
9 51 40 43 30 11 5 120 120 34x22x22
9A 51 40 39 34 15 14 123 120 34x22x22
10 60 52.6 49.7 30.2 11.5 11 150 100 34x22x22
11 56.8 47.8 48.8 44 14.8 10 166 100 34x22x22
14 110 80 88 70 24 14 320 50 34x22x22

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