A centrifugal machine for granular solid materials, comprising at least: - a hopper capable of enabling the entry of granular solid materials; - a centrifuging mechanism associated to the hopper, the centrifuging mechanism being provided with at least one rotary helical device capable of enabling the transport of the granular solid materials, the centrifuging mechanism being provided with a perforated rotary piece that involves the rotary helical device externally, the rotary piece being configured to remove, by centrifugal force, free liquids adhered to the surface of the granular solid materials; - a solid outlet duct associated to the centrifugal mechanism, the solid outlet duct being capable of enabling the centrifuged granular solid materials to come out; - a driving mechanism associated to the centrifuging mechanism, the driving mechanism being capable of enabling rotation of the rotary helical device and of the rotary piece; wherein - the rotary helical device is associated to the driving mechanism by means of a first central axle, the first central axle being comprised by the centrifugal machine; and - the rotary piece is associated to the driving mechanism by means of a second central axle, the second central axle being comprised by the centrifugal machine; and wherein the first central axle and the second central axle are turnable by the driving mechanism independently of each other, the driving mechanism being configured to provide: - specific adjustment of angular velocity for the rotary helical device around its central axis through the first central axle; and - specific adjustment of angular velocity for the rotary piece around its central axis through the second central axle; the centrifugal machine being characterized in that: the second central axle being arranged internally and concentrically with the first central axle. - a hopper capable of enabling the entry of granular solid materials; - a centrifuging mechanism associated to the hopper, the centrifuging mechanism being provided with at least one rotary helical device capable of enabling the transport of the granular solid materials, the centrifuging mechanism being provided with a perforated rotary piece that involves the rotary helical device externally, the rotary piece being configured to remove, by centrifugal force, free liquids adhered to the surface of the granular solid materials; - a solid outlet duct associated to the centrifugal mechanism, the solid outlet duct being capable of enabling the centrifuged granular solid materials to come out; - a driving mechanism associated to the centrifuging mechanism, the driving mechanism being capable of enabling rotation of the rotary helical device and of the rotary piece; wherein - the rotary helical device is associated to the driving mechanism by means of a first central axle, the first central axle being comprised by the centrifugal machine; and - the rotary piece is associated to the driving mechanism by means of a second central axle, the second central axle being comprised by the centrifugal machine; and wherein the first central axle and the second central axle are turnable by the driving mechanism independently of each other, the driving mechanism being configured to provide: - specific adjustment of angular velocity for the rotary helical device around its central axis through the first central axle; and - specific adjustment of angular velocity for the rotary piece around its central axis through the second central axle; the centrifugal machine being characterized in that: the second central axle being arranged internally and concentrically with the first central axle.