Apparatus for the manufacturing of cement

Claim 2

Apparatus for the manufacture of cement, lime, alumina and the like from raw material, said apparatus comprising preheater means; means for delivering raw material to said preheater means; a furnace; means for discharging raw material from said preheater means to said furnace; means establishing a heated idling zone; means for diverting from said furnace to said idling zone a portion of raw material discharged from said preheater means; and means connecting said idling zone to said preheater means for returning to the latter raw material diverted to said idling zone.

Claim 3

Apparatus according to claim 1 wherein the means establishing an idling zone comprises an upright housing having inlets for gas and preheated raw material, respectively, and a common outlet for gas and raw material.

Claim 4

Apparatus according to claim 2 wherein said inlets are at the lower part of said housing and said outlet is at the upper part of said housing.

Claim 5

Apparatus according to claim 1 including adjustable control means for said diverting means for varying the amount of raw material circulated through said idling zone.

Claim 6

Apparatus according to claim 1 wherein said preheater means comprises a plurality of cyclones, and wherein said second conduit means establishes communication between said idling zone and a selecteD number of said cyclones for delivering raw material from said idling zone to the selected cyclones.

Claim 7

Apparatus according to claim 1 wherein said preheater means comprises at least two lower cyclones arranged in parallel, a central cyclone, two further cyclones arranged in parallel above said lower cyclones, and two uppermost cyclones, and wherein one of said idling zones is associated with each of said lower cyclones.

Claim 8

Apparatus for the manufacture of cement, lime, alumina and the like from raw material, said apparatus comprising a plurality of preheater cyclones arranged in superposed interconnected relation; a furnace; means for directing exhaust gases from said furnace through said preheater cyclones; an additional heating chamber; means for combusting fuel in said chamber; first means for discharging raw material from the lowermost preheater cyclone to said furnace; second means for discharging raw material from said lowermost cyclone to said chamber; adjustable control means for regulating the discharge of raw material from said lowermost cyclone to the respective first and second means: and conduit means connecting said chamber to said lowermost cyclone for returning raw material thereto from said chamber.

Claim 9

Apparatus for the manufacture of cement, lime, alumina and the like from raw material, said apparatus comprising a plurality of preheater cyclones arranged in superposed interconnected relation; a furnace; means for directing exhaust gases from said furnace through said preheater cyclones; an additional heating chamber; means for combusting fuel in said chamber; first means for discharging raw material from the lowermost preheater cyclone to said furnace; second means for discharging raw material from said lowermost cyclone to said chamber; adjustable control means for regulating the discharge of raw material from said lowermost cyclone to the respective first and second means: and conduit means connecting said chamber to said lowermost cyclone for returning raw material thereto from said chamber.