XTL Sintyron manufacture 6A 7A 8A bone ash cupel for gold melting

bone ash cupels in cupellation dates back to ancient times and continues to be a common practice in the refining industry today. The cupels are typically shaped like shallow, bowl-like containers with a hollow center to hold the metal being refined. They are able to withstand the high temperatures necessary for the cupellation process without melting or deteriorating.

Bone ash cupels are manufactured by mixing bone ash, clay, and water to form a paste that is then molded into cup shapes. The cupels are fired at high temperatures to burn off any organic matter, leaving behind a porous structure that is able to absorb and remove lead and other impurities during the cupellation process.

Bone ash cupels have excellent thermal stability and can withstand the high temperatures required for cupellation without deforming or cracking. They also have a high absorption capacity, allowing them to efficiently remove impurities from precious metals such as gold and silver.

Bone ash cupels are commonly used in the jewelry and mining industries for the refinement of precious metals. They are essential tools in the cupellation process, where they act as absorptive containers for the lead oxide formed during the oxidation of base metals, allowing the pure precious metal to be recovered.

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