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An apparatus for separating granular material into at least three fractions a static cross-flow sifter and a dynamic sifter. The static has several impact and flow-conducting elements stepped one below the other in a housing having a first material inlet, at least one sifting-gas inlet and at least

An apparatus for separating granular material into at least three fractions a static cross-flow sifter and a dynamic sifter. The static has several impact and flow-conducting elements stepped one below the other in a housing having a first material inlet, at least one sifting-gas inlet and at least one coarse-particle outlet. The dynamic sifter has a rod basket rotatable about a vertical axis, a housing containing the basket, and at least one medium-particle outlet and one fine-particle outlet. The housing of the static sifter merges directly horizontally and laterally into the housing of the dynamic sifter.

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1. An apparatus for separating granular material into at least three fractions and comprising: at least one static cross-flow sifter having several impact and flow-conducting elements stepped one below the other in a housing having a first material inlet, at least one sifting-gas inlet and at least

1. An apparatus for separating granular material into at least three fractions and comprising: at least one static cross-flow sifter having several impact and flow-conducting elements stepped one below the other in a housing having a first material inlet, at least one sifting-gas inlet and at least one coarse-particle outlet, anda dynamic sifter having a rotary rod basket and a housing containing the basket and having at iz least one medium-particle outlet and one fine-particle outlet, the housing of the static sifter merging directly horizontally and laterally into the housing of the dynamic sifter, the rod basket of the dynamic sifter being rotatable about a vertical axis. 2. The apparatus according to claim 1, wherein the housing of the static sifter merges with a tangential, spiral, or radial orientation, or an orientation between a radial or tangential orientation into the housing of the dynamic sifter. 3. The apparatus according to claim 1, wherein the housing of the dynamic sifter has an upper housing section holding the rotary rod basket and a lower housing section into which merges the housing of the static sifter. 4. The apparatus according to claim 1, wherein the impact or flow-conducting elements that are angled relative to each other. 5. The apparatus according to claim 4, wherein the angle of impact or flow-conducting elements is adjustable. 6. The apparatus according to claim 1, wherein the impact or flow-conducting elements are formed by roof-shaped structures. 7. The apparatus according to claim 6, wherein the roof-shaped structures can be displaced horizontally. 8. The apparatus according to claim 1, wherein at least one chute wall of the housing of the static sifter is oriented at an acute angle between 10° and 70° relative to the vertical. 9. The apparatus according to claim 1, wherein a sifting zone of the static sifter formed between the impact or flow-conducting elements stepped one above the other is oriented at a preset angle of 10° to 70° relative to the vertical. 10. The apparatus according to claim 1, wherein the sifting-gas inlet is formed by at least one inlet opening that extends at an angle above the elements. 11. The apparatus according to claim 1, wherein the sifting-gas inlet is formed alternately or additionally by a plurality of openings formed in a chute wall of the housing of the static sifter. 12. The apparatus according to claim 1, further comprising: air distributors upstream in the direction of flow of the impact or flow-conducting elements inside the housing of the static sifter. 13. The apparatus according to claim 1, wherein the housing of the dynamic sifter has at least one second material inlet. 14. The apparatus according to claim 1, wherein the housing of the dynamic sifter is cylindrical at least in sections. 15. The apparatus according to claim 1, wherein two or more of the static sifters are laterally connected to the dynamic sifter by one housing. 16. The apparatus according to claim 15, wherein the static sifters are angularly equispaced at 360°/n, where n is the number of the static sifters. 17. A grinding mill for the comminution of granular material having at least one first comminuter and the apparatus according to claim 1, wherein material discharged from the first comminuter enters the static sifter through the first material inlet,coarse material discharged via the coarse-particle outlet of the static sifter is fed to the first comminuter, andmedium material discharged from the dynamic sifter is fed to the first comminuter or an additional second comminuter. 18. The mill according to claim 17 having a second comminuter, wherein medium material discharged from the dynamic sifter is fed at least partially to the second comminuter, andmaterial discharged from the second comminuter is fed via the second material inlet to the dynamic sifter or to a separate, second air classifier. 19. The mill according to claim 18, wherein the first comminuter is a roll crusher or the second comminuter is a ball mill. 20. An apparatus for separating granular material into at least three fractions and comprising: at least one static cross-flow sifter having a housing having a first material inlet and a sifting-gas inlet,several impact and flow-conducting elements stepped one below the other in the housing below the inlets, anda downwardly opening coarse-particle outlet below the elements; and a dynamic sifter havingan upper housing part having a fine-particle outlet,a rotary rod basket rotatable about a vertical axis and contained in the upper housing part, anda lower housing part underneath the upper housing part and having a downwardly opening medium-particle outlet, the housing of the static sifter being level with and merging in a spiral or tangential manner and directly laterally into the lower housing part. 21. The apparatus according to claim 20, wherein the housing of the dynamic sifter is provided with one or several additional air supplies in the upper housing part thereof. 22. The apparatus defined in claim 20, wherein the fine-particle outlet opens upwardly out of the upper housing part flow through the apparatus is from the inlets down through the static filter where coarse particles are separated and fed out through the coarse-particle outlet and medium and fine particles are fed up to the upper housing part whence fine particles are separated and fed upward out of the fine-particle outlet and medium particles are fed downward through the lower housing part to the medium-particle outlet.