Magnesium Oxide Cupel Block
Magnesium Oxide Cupel Block
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Magnesium Oxide Cupel Block Data Sheet
|
Color |
Yellow, Light yellow, or White |
|
Materials |
MgO |
|
Purity |
96% min |
Magnesium Oxide Cupel Block Description
Magnesium Oxide Cupel Block is a monolithic refractory block made from high-purity and high-density magnesium oxide, featuring multiple precisely formed cavities for simultaneous cupellation operations. Each cavity functions as an independent reaction chamber, enabling accurate and efficient fire assay of precious metals. During use, the block quickly absorbs large quantities of lead oxide without splashing or cracking, leaving high-purity gold and silver alloy grains. It maintains excellent structural integrity under extreme temperatures and remains stable against humidity and freezing conditions. After cupellation, the metallic grains can be easily separated from the cavities.
Magnesium Oxide Cupel Block Specifications
|
Type |
Hole |
Hole(Length Direction) |
Hole(Width Direction) |
a (mm) |
b (mm) |
c (mm) |
d (mm) |
|
4 HB |
4 |
2 |
2 |
4 |
4 |
4 |
4 |
|
4 SAHB |
4 |
2 |
2 |
5 |
5 |
6 |
6 |
|
6 HB |
6 |
3 |
2 |
2.5 |
2.5 |
5 |
5 |
|
6 HB(T) |
6 |
3 |
2 |
5.25 |
4 |
5.5 |
4 |
|
10 HB |
10 |
5 |
2 |
5 |
5 |
6 |
4.5 |
|
12 HB |
12 |
4 |
3 |
3 |
3 |
6 |
6 |
|
12 HB(L) |
12 |
6 |
2 |
5.25 |
5.25 |
5.5 |
4.5 |
|
14 HB |
14 |
7 |
2 |
3 |
3 |
2 |
2 |
|
21 HB |
21 |
7 |
3 |
3 |
3 |
2 |
2 |
|
24 HB |
24 |
6 |
4 |
4 |
4 |
4 |
4 |
|
24 HB(L) |
24 |
6 |
4 |
5.5 |
4 |
5.5 |
5.6 |
Magnesium Oxide Cupel Block Specifications (Bevel-Edge and Straight-Edge)
|
Type |
Hole |
Length |
Width |
Height |
Diameter of Hole |
Depth of Hole |
Ridge Height |
Bevel-Edge Height |
Weight (Approx.) |
|
|
|
L |
L1 |
W |
W1 |
H |
D |
H1 |
H2 |
|
4 HB |
4 |
48 |
— |
48 |
— |
20 |
18 |
6.5 |
— |
|
4 SAHB |
4 |
80 |
— |
80 |
— |
26 |
30 |
9 |
— |
|
6 HB |
6 |
76.5 |
— |
51 |
— |
20 |
20.5 |
8 |
— |
|
6 HB(T) |
6 |
82 |
72 |
60 |
50 |
20 |
22 |
7 |
6 |
|
10 HB |
10 |
138 |
128 |
60 |
50 |
20 |
22 |
7 |
6 |
|
12 HB |
12 |
80 |
— |
60 |
— |
20 |
14 |
7 |
— |
|
12 HB(L) |
12 |
165 |
155 |
60 |
50 |
20 |
22 |
7 |
6 |
|
14 HB |
14 |
179 |
— |
54 |
— |
20 |
20 |
7.5 |
— |
|
21 HB |
21 |
172 |
162 |
76 |
66 |
20 |
22 |
7 |
6 |
|
24 HB |
24 |
124 |
114 |
84 |
74 |
20 |
16 |
7 |
6 |
|
24 HB(U) |
24 |
165 |
— |
120 |
— |
20 |
21.5 |
7 |
— |
Magnesium Oxide Cupel Block Features
- High-Purity Raw Materials: Manufactured using premium-grade magnesium oxide and advanced formulations to ensure consistent density, purity, and absorption performance.
- Uniform Structure and Smooth Surface: Each block features a precisely formed surface with clean, well-defined cavities for accurate and efficient cupellation.
- Exceptional Mechanical Strength and Thermal Stability: Withstands repeated high-temperature use without cracking, warping, or pitting, ensuring long-lasting durability.
- Stable Against Environmental Conditions: Resistant to moisture, temperature fluctuations, and freezing, maintaining stable quality during long-term storage.
- Efficient Lead Oxide Absorption: Capable of rapidly absorbing large amounts of lead oxide—up to about 70% of its own weight—ensuring minimal loss of precious metals.
- Advanced Production and Quality Control: Manufactured using modern machinery under ISO 9001-certified systems, with ongoing laboratory testing to guarantee consistent product quality.
Magnesium Oxide Cupel Block Applications
- Fire Assay Analysis: Used in laboratories for determining precious metal content in ores, concentrates, and alloys through the cupellation process.
- Gold and Silver Refining: Efficiently separates precious metals from lead and other impurities, ensuring accurate recovery of high-purity gold and silver.
- Mining and Metallurgical Testing: Essential for quality control and assay testing in mining operations, smelting plants, and metal refining facilities.
- Analytical Laboratories: Applied in research and testing institutions for reliable quantitative analysis of noble metals.
- Industrial Quality Assurance: Used in production environments where precise metal content verification is required for raw materials and finished products.
Precious Metal Assaying
Laboratory Analysis
Educational and Research Use
Magnesium Oxide Material Properties
Magnesium Oxide Ceramic Machining
Magnesium oxide can be machined in green or bisque form before sintering, and to a limited extent in its fully sintered state. In its pre-sintered state, the material is relatively soft and easier to shape, but like many ceramics, it undergoes significant shrinkage—up to 20%—during sintering, which can affect final dimensions. Fully sintered magnesium oxide is very hard and brittle, requiring diamond tools and precision equipment for any post-sintering machining.
Machining Methods and Considerations
- Green or Bisque Machining: Easier to cut and form, suitable for complex shapes before firing.
- Sintering Shrinkage: Expect about 15–20% dimensional reduction during sintering, which impacts tolerance control.
- Post-Sintering Machining: Requires diamond grinding tools due to the material’s hardness and brittleness.
- Fragility: Fully sintered MgO is prone to chipping and fracture if not handled with care during machining.
- Tooling and Time: Machining dense MgO ceramics is time-consuming and requires specialized equipment.
Magnesium Oxide Ceramic Packaging
Magnesium oxide ceramic products are typically packaged in vacuum-sealed bags to prevent moisture or contamination and wrapped with foam to cushion vibrations and impacts during transport, ensuring the quality of products in their original condition.
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