Graphite crucible for gold melting
A graphite crucible for gold melting is a purpose-designed melting vessel used to handle high-value precious metals with maximum cleanliness, thermal control, and reliability. In gold processing, where material loss and contamination are unacceptable, crucible performance directly affects yield, surface quality, and operational confidence.
Product Description
Graphite crucibles for gold melting are manufactured from high-purity, fine-grain graphite using precision forming and high-temperature graphitization. The resulting structure offers excellent thermal conductivity, low metal adhesion, and strong resistance to thermal shock.
Gold melts at approximately 1,064 °C, a temperature range where graphite performs exceptionally well. The material does not react with molten gold and provides a clean, stable environment throughout repeated melting cycles.
For jewelers, refiners, and small-scale foundries, this type of crucible is considered a standard tool rather than an optional upgrade.
Key Performance Advantages
Clean Melting and Low Metal Loss
Graphite has extremely low wettability with molten gold. The metal does not stick to the crucible wall, which helps:
Reduce gold residue after pouring
Minimize metal loss during cleaning
Improve overall recovery rate
In real use, this directly protects material value.
Excellent Thermal Conductivity
Graphite crucibles heat quickly and evenly, whether used in gas furnaces, electric furnaces, or induction systems. Uniform temperature distribution reduces localized overheating and helps maintain stable melt conditions.
This is especially useful when melting small batches where temperature control is critical.
Strong Thermal Shock Resistance
Gold melting often involves frequent heating and cooling. Graphite’s low thermal expansion allows the crucible to withstand rapid temperature changes without cracking, extending service life even under repeated use.
Chemical Stability
High-purity graphite does not contaminate molten gold and remains stable in contact with fluxes commonly used in refining and jewelry casting. This helps maintain metal purity and surface finish.
Typical Applications
Jewelry Manufacturing
Used for melting gold alloys prior to casting rings, chains, and precision components.
Gold Refining and Recycling
Suitable for remelting scrap gold, doré bars, and recovered materials during refining processes.
Laboratory and Small Foundry Use
Ideal for controlled melting in research labs, assay work, and pilot-scale precious metal processing.
Standard Specifications (Easy Selection)
Size and Capacity
Graphite crucibles for gold melting are commonly offered in small to medium capacities, such as:
50 g – 500 g
1 kg – 5 kg
Custom sizes available upon request
Selection is usually based on gold charge weight and furnace chamber size.
Material Grades
Available options typically include:
Fine-grain graphite for longer service life
High-purity graphite for sensitive refining operations
Reinforced designs for repeated high-frequency use
Suppliers may recommend different grades depending on whether the crucible is used for jewelry casting or bulk refining.