1. Technical Parameters of Clay Crucibles
|
SiO2, % |
60-65 |
|
MgO, % |
＜0.2 |
|
CaO, % |
＜0.6 |
|
Al2O3, % |
30-40 |
|
Fe2O3, % |
＜2 |
|
TiO2, % |
＜2 |
|
Na2O, % |
＜0.1 |
|
K2O, % |
＜0.5 |
|
Density, g/cm3 |
＞2 |
|
Cold Crushing Strength, MPa |
＞20 |
2. Product Description
The primary raw materials for clay crucibles are high-alumina materials and refractory clay, with the addition of appropriate amounts of quartz and feldspar as fluxes. These are sintered at high temperatures to form a dense ceramic structure. The operating temperature range is 1150°C to 1300°C. In gold and silver analysis and determination processes, the product can be used long-term at 1200°C and withstand thermal shocks caused by rapid heating.
These clay crucibles maintain good chemical stability even under high temperatures and strong oxidizing fluxes (such as borax, soda ash, lead oxide, etc.). They also demonstrate stability in maintaining shape and mechanical strength at high temperatures, adapting to frequent cycle processes of charging, heating, and discharging. Their relatively low coefficient of thermal expansion helps minimize deformation or cracking, while a moderate porosity facilitates flux penetration and reaction.
Clay crucibles are primarily used for the analysis and determination of precious metals, as well as for processes such as oxidizing smelting, absorption, and separation.
3. Key Features
Good chemical stability: Resistant to corrosion from fluxes like borates, carbonates, and lead oxide.
Strong thermal shock resistance: Suitable for frequent cycle processes of charging, heating, and discharging.
High-temperature resistance and stable performance: Maintains shape and strength stability at high temperatures.
Relatively low coefficient of thermal expansion: Effectively reduces the degree of deformation or cracking.
4. Main Applications
Clay crucibles are mainly used for the quantitative analysis, determination, and separation of precious metals.
5. Precautions
Perform low-temperature preheating before use to reduce thermal shock.
The heating rate during use should be slow; avoid sudden, rapid temperature increases.
Allow natural cooling after use to prevent cracking due to rapid cooling.
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