Gold pan mill, also known as wet mill or amalgamation mill, is mainly suitable for gold ore processing where the gold content is relatively high (such as native gold, fissure gold, inclusions, fine-grained gold, and micro-granular gold) and easy to recover. It is also suitable for grinding, pulverizing, and processing other non-ferrous metals and non-metallic minerals such as copper, silver, quartz, and wollastonite. During gold selection, the amalgamation method can be applied: “internal amalgamation” involves mercury placed inside the water basin, while “external amalgamation” involves the overflow slurry passing through the amalgamation chute or mercury plate. Depending on mineral properties, the gold pan mill can be used independently or in combination with gravity separation equipment and flotation equipment.
Features of gold pan mill:
The gold pan mill stirs, crushes, and repeatedly grinds raw materials to achieve balanced moisture, uniform mixing, and reduced air content, thereby improving molding rate and quality. Materials processed through the mill produce products with high density, good strength, and minimal porosity. It is highly efficient, energy-saving, and delivers high output. This equipment is also applied in recovering tailings from iron ore processing, preventing ore powder loss and ensuring maximum utilization of valuable resources.
The gold pan mill mainly consists of a power unit, frame, water basin, grinding wheels, and grinding disc. While the wheels crush and knead the minerals, they also mix and slurry the materials. Fine liberated minerals produced by grinding are carried with the slurry to the surface layer, then discharged through the overflow outlet of the basin for the next processing stage. Coarse particles settle at the bottom of the disc and continue grinding until they reach the required fineness. A screen is installed at the basin’s discharge port (the mesh size should be selected based on mineral type and processing requirements) to strictly control particle size distribution, preventing over-grinding or uneven size, and ensuring favorable conditions for subsequent operations.
Gold pan mill selection method and process for gold selection:
1. After installation and adjustment, add about 5 kg of mercury to the bottom of the mill basin before starting normal operation.
2. Collect gold once per shift. At shift change, add 1 kg of mercury to recover the gold and mercury from the mill bottom. Place the amalgam into a container, wrap it in a dense red cloth, and squeeze out the mercury. The remaining material inside the cloth is gold.
3. At the start of each shift, add 1 kg of mercury. Additionally, a gold-catching cloth or blanket can be used, followed by an amalgamation plate, to further collect gold.
