Cementitious products
AssigneeJohn Fletcher
InventorDesmond Whiteley
Life of this patent
Estimating the term…
Abstract
A rotating kiln or cooler for use in the manufacture of cementitious materials comprises a tubular body (1) mounted for rotation about the longitudinal axis thereof, a material being fed into the body at one end and removed at the other end. Air or combustion gases flow through the body (1) in the opposite direction to the material. In order to improve the heat transfer between the material and the air or gases, at least one ring (12) of lifting members (34) is provided on the interior periphery of the body (1). The members (34) lift the material and allow it to drop back to the bottom of the kiln, thus increasing the surface area of the material in contact with the air or gases.
Claims10
A rotating kiln for the manufacture of cementitious material, said kiln comprising in combination:
- (a) an elongated tubular member mounted for rotation about an axis inclined to the horizontal and having a lower end, the central cross-section of said tubular member being free from any fixed obstruction to the flow of gases through said tubular member;
- (b) means for feeding a material into said tubular member;
- (c) means for permitting the exit of material from adjacent to the lower end of said tubular member;
- (d) at least one lifting device, each said lifting device including:
- i. at least one ring, each said ring including a plurality of lifting members rigidly fixed to the interior periphery of said tubular member and extending radially inwardly of said tubular member for lifting material from adjacent to the bottom of said tubular member and for allowing the material to drop back to the bottom of said tubular member, each said lifting member including an inlet opening through which the material enters said lifting member, an outlet opening from which the material leaves said lifting member and a passageway for the material between said inlet and outlet openings;
- and
- ii. banker rings disposed intermediate said rings for delaying passage of the material through said passageway of said lifting members in said rings said banker rings including means for restricting said outlet openings of said lifting members.
Dependencies are inferred from the claim text.