Ball-grinding tank

The invention discloses a ball-grinding tank which comprises an upper outer nylon frame and a lower outer nylon frame, wherein the upper outer frame and the lower outer frame are internally and respectively provided with a hemispheric cavity, the hemispheric cavities of the upper outer frame and the lower outer frame are internally provided with an upper hemispheric liner and a lower hemispheric liner, the contact surface of the upper liner and the lower liner is provided with a sealing ring, and the upper outer frame is connected with the lower outer frame through a connecting member. The upper liner and the lower liner are made of metal thin liners. The ball-grinding tank disclosed by the invention has the advantages of light weight, economy, capacity of replacing the liners, no pollution and high-energy ball grinding resistance, and is an energy-saving high-energy ball-grinding tank suitable for producing a thermoelectric material industrially. In addition, the thin liners are not adhered with the upper ou