Abstract: A tumbling mill includes an inlet area, an outlet area, and a tumbling area between the inlet and outlet areas. The mill is formed as a tri-cyclical member having an outer cylinder extending along the tumbling and outlet areas, and an inner cylinder concentric with the outer cylinder and extending through the inlet, outlet and tumbling areas. The inner and outer cylinders define a space therebetween. The inner cylinder is perforated to allow sand to fall into the space between the inner and outer cylinders. The inner cylinder includes an inner helical vane to urge sand, media, and castings toward the outlet area, and an outer helical vane to urge sand and media toward the inlet area. A reclassifying screen is provided in the inlet area to classify sand. Sand particles that are sufficiently small passes through the screen and out a chute. Sand particles that are not small enough are recirculated through the tumbling mill to be further broken down.

Abstract: In order to wash inert materials, even of a large size, with a limited amount of washing liquid and with a lesser consumption of energy and without moving metal parts, apparatus having a plurality of tubular rotors (1) which are in side-by-side relation but spaced a distance from each other and are rigidly locked with a common shaft (13) which is horizontal or at an angle with respect to the horizontal, in which each rotor (1) has a plurality of transverse annular baffle plates (2) adapted to delimit corresponding annular channels (3) and having in each channel (3) a plurality of peripheral boxes (15). As the rotors (1) revolve, the washing liquid overflows to the outside over the lower baffle plate (2) of each rotor (1) and the material being washed, which is introduced through the mouth of the rotor (1) located at one end of the apparatus, advances against the current through all the rotors (1) until it is discharged from the mouth of the rotor (1) located at the other end.

Abstract: The seed cleaner comprises a scalper drum which drives an auger pick up and which separates all materials thicker than the desired seed such as head, stalks and the like. The remaining fraction then passes through an air cleaner which removes chaff, dust and light fractions. The remainder is fed into a pair of shells or drums which screen out seed and the like which is thinner than the desired fraction and then this desired fraction passes into an indent or pocket-type separator drum. This indent drum includes two sections, the first section which removes seeds shorter than the desired length and the second section which removes and discharges longer than desired seeds. The remaining seed is fed from the second section and collected at the discharge end of a trough pick up of the indent drum.