… Machinery for sorting, screening, separating, washing, crushing, grinding, mixing or kneading earth, stone, ores or other mineral substances, in solid … shaping or moulding solid mineral fuels, ceramic paste, unhardened cements, plastering materials or other mineral …
Explanatory notes
… increase in size towards the lower end. These machines are of two types : in the first type, the wire mesh or … The material is thrown violently (e.g., by rapidly rotating arms) against the walls of the machine. (6) Hammer type … crushing ores. A series of cam‑operated drop hammers, often arranged in graduated stages, break up the material to the …