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precious metals recovery from e-waste

     

Precious Metals Recovery From E-waste Containing Gold And Palladium

Pre-Treatment With Fire:

(1) Roasting

The raw materials, such as gold-silver-platinum-iridium diodes and capacitors, are placed into the roasting kiln and rapidly heated to 600°C. The temperature is controlled within a range of approximately 600~800°C to ensure stable decomposition and vaporization of the materials in the kiln. This stage typically takes about 4~6 hours. After roasting, the products are crushed into smaller particles.

(2) Crushing

The roasted products are bulky, which could hinder subsequent precious metal recovery. The roasted products are therefore ground into fine granular materials before being sent to the wet recycling process.

After roasting, the products are fed into a crusher to break them into smaller pieces. These pieces are then transferred to the ball mill for further processing.

(3) Ball Milling and Sieving

The crushed pieces undergo ball milling to reduce their particle size further. The larger particles from the sieve are sent back to the ball mill for reprocessing, while the finer particles are forwarded to the wet recycling process.

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