A mixing silo for bulk material comprising a. a silo container, b. a mixing installation (16, 19; 40; 16e) for mixing the bulk material, c. at least one shut-off element (18, 21; 30; 30b; 30c; 30d, 42; 30e, 45, 46; 45, 48) for shutting off the mixing installation (16, 19; 40; 16e; 16f), wherein the at least one shut-off element (18, 21; 30; 30b; 30c; 30d, 42; 30e, 45, 46; 45, 48) is movable between a closed position, in which a bulk material flow through the mixing installation (16, 19; 40; 16e) is prevented and the mixing silo (4; 4a; 4b; 4c; 4d; 4e; 4f) has a flow-through function, and an open position, in which a bulk material flow through the mixing installation (16, 19; 40; 16e) is possible and the mixing silo (4; 4a; 4b; 4c; 4d; 4e; 4f) has a mixing function, - wherein the at least one shut-off element (18, 21; 30; 30b; 30c; 30d, 42; 30e, 45, 46; 45, 48) is arranged at and/or in the mixing installation (16, 19; 40; 16e; 16f), wherein the at least one shut-off element (18, 21; 30; 30b; 30c; 30d, 42; 30e, 45, 46; 45, 48) is arranged at the outlet of the mixing installation (16, 19; 40; 16e; 16f), - wherein the mixing silo (4; 4a; 4b; 4c; 4d; 4e; 4f) has a minimum extraction rate, - wherein the silo container, with the mixing installation(16, 19; 40; 16e; 16f) shut off, has a residual cross-sectional area that is limiting to the silo container in such a manner that a mass flow of the bulk material ensures the flow-through function and is greater than or equal to the minimum extraction rate of the mixing silo (4; 4a; 4b; 4c; 4d; 4e; 4f), wherein the limiting residual cross-sectional area represents a minimum cross-sectional area of the silo container along the flow direction of the bulk material, characterized in that the mixing installation is fastened in the silo container, and that the minimum extraction rate is at least 20 t/h for plastic bulk material comprising powder with an average particle size of between 50 μm and 2000 μm and/or granulate with an average particle size of 1500 μm to 6000 μm, a. a silo container, b. a mixing installation (16, 19; 40; 16e) for mixing the bulk material, c. at least one shut-off element (18, 21; 30; 30b; 30c; 30d, 42; 30e, 45, 46; 45, 48) for shutting off the mixing installation (16, 19; 40; 16e; 16f), wherein the at least one shut-off element (18, 21; 30; 30b; 30c; 30d, 42; 30e, 45, 46; 45, 48) is movable between a closed position, in which a bulk material flow through the mixing installation (16, 19; 40; 16e) is prevented and the mixing silo (4; 4a; 4b; 4c; 4d; 4e; 4f) has a flow-through function, and an open position, in which a bulk material flow through the mixing installation (16, 19; 40; 16e) is possible and the mixing silo (4; 4a; 4b; 4c; 4d; 4e; 4f) has a mixing function, - wherein the at least one shut-off element (18, 21; 30; 30b; 30c; 30d, 42; 30e, 45, 46; 45, 48) is arranged at and/or in the mixing installation (16, 19; 40; 16e; 16f), wherein the at least one shut-off element (18, 21; 30; 30b; 30c; 30d, 42; 30e, 45, 46; 45, 48) is arranged at the outlet of the mixing installation (16, 19; 40; 16e; 16f), - wherein the mixing silo (4; 4a; 4b; 4c; 4d; 4e; 4f) has a minimum extraction rate, - wherein the silo container, with the mixing installation(16, 19; 40; 16e; 16f) shut off, has a residual cross-sectional area that is limiting to the silo container in such a manner that a mass flow of the bulk material ensures the flow-through function and is greater than or equal to the minimum extraction rate of the mixing silo (4; 4a; 4b; 4c; 4d; 4e; 4f), wherein the limiting residual cross-sectional area represents a minimum cross-sectional area of the silo container along the flow direction of the bulk material, - wherein the at least one shut-off element (18, 21; 30; 30b; 30c; 30d, 42; 30e, 45, 46; 45, 48) is arranged at and/or in the mixing installation (16, 19; 40; 16e; 16f), wherein the at least one shut-off element (18, 21; 30; 30b; 30c; 30d, 42; 30e, 45, 46; 45, 48) is arranged at the outlet of the mixing installation (16, 19; 40; 16e; 16f), - wherein the mixing silo (4; 4a; 4b; 4c; 4d; 4e; 4f) has a minimum extraction rate, - wherein the silo container, with the mixing installation(16, 19; 40; 16e; 16f) shut off, has a residual cross-sectional area that is limiting to the silo container in such a manner that a mass flow of the bulk material ensures the flow-through function and is greater than or equal to the minimum extraction rate of the mixing silo (4; 4a; 4b; 4c; 4d; 4e; 4f), wherein the limiting residual cross-sectional area represents a minimum cross-sectional area of the silo container along the flow direction of the bulk material,