Abstract: An impeller shoe (110) having a front side (112) with a series of half column members (114) and raised upper and lower rims (116, 118) that form the impact surface of the impeller shoe. Half columns (114) and raised rims (116, 118) are formed with carbide material (120) formed therein in order to improve wear resistance at these critical surfaces.

Abstract: A wear resistant, high-impact iron alloy member (20,22) suitable for use in an impact rock crusher and a method of making the same. The invention provides a white iron alloy member (20,22) having at least one wear surface (24) with carbide granules encapsulated in a matrix (28) of white iron and contained in a selected region adjacent the wear surface (24) of the member (20,22). The iron alloy member is made by a method of casting comprising the steps of: placing a molding insert (35,40) in a mold (60) at a selected location adjacent the wear surface (24); positioning a quantity of carbide granules (29), most preferably tungsten carbide granules 29, in the molding insert (35,40) before pouring; and pouring molten white iron alloy into the mold (60) to form the casting.

Abstract: A rock crusher (10) including a turntable (26) with a series of impellers (34) mounted thereon. Each impeller (34) includes a curved, C-shaped pocket (56) that includes a radially inwardly sloped wall (59) terminating in a transversely extending lip (111). The impeller (34) is oriented in a somewhat closed position or greater angle of attack (90) so that the front face (54) of the impeller is exposed to oncoming rocks. A method of retaining rock fines (116) in a pocketed impeller (34) of a rock crusher (10) which includes orienting a radially outermost pocket wall (59) in a radially inwardly sloped orientation is disclosed.