Although most of the gold in the re-elected gold concentrate is in a free state, the surface of the gold particles is often contaminated to varying degrees, and some gold and other minerals or gangues are in a living form. When re-selecting gold concentrate with a mercury-mixing cylinder, steel balls are often added to the cylinder, and the surface film of the gold particles is removed by grinding and the gold particles are dissociated from the continuum to treat the weight of the free gold particles with clean surface. In the case of sand concentrates, light-weight amalgamation cylinders are generally used, and the amount of hitting balls is small. When heavy sand concentrates with high content of continuous granules and serious surface contamination of gold particles are used, heavy-duty amalgamation cylinders are often used.
| Type | Inner Size | OreLoading (kg) | Speed (r/min) | Power (kw) | Ball Weight (kg) | Ball Dia (mm) | |||
| Dia | Length (mm) | Volumn (m3) | |||||||
| Light Type | 420 | 600 | about 0.3 | 50-90 | 20-22 | 0.75-1.5 | 10-20 | 38-50 | |
| Heavy Type | 0-31 | 600 | 800 | 0.233 | 100-150 | 22-38 | 0.3-2.1 | 150-300 | 38-50 |
| 0-3b | 750 | 900 | 0.395 | 200-300 | 21-36 | 1.7-3.75 | 300-600 | 38-50 | |
| 800 | 1200 | 0.60 | 300-450 | 20-33 | 3-6 | 500-1000 | 38-50 | ||
