The brief review of external environments of full-spheres in tumbling mills is reduced. The base aspects of a wear of grinding balls on all reduction stages of ore are reviewed. The ways of a strength improvement of full-spheres are proposed by perfecting know-how of casting. There was developed method of a place of an intake of metal in the shape for supply of maximal power supply of a full-sphere is designed for the purpose of elimination of a shrinking.
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