Containing unit of material used in iron and steel processes comprising: - a container having a substantially vertical longitudinal axis and at least one lateral wall that defines an internal cavity, said lateral wall being provided with a plurality of through lateral apertures, which put said internal cavity into communication with the outside, - a discharge device installed at least partly in said container to divide said internal cavity into a first zone disposed above said discharge device and in which said material is contained and processed, and a discharge zone disposed below said discharge device and through which said material is discharged, in a controlled manner, by said discharge device, wherein said discharge device comprises a plurality of movement members each provided with a rotary shaft disposed in one of said lateral apertures and rotatable around its axis of rotation transverse to said longitudinal axis, and movement means solid with said rotary shaft so as to move said material from the first zone toward a discharge aperture of said discharge zone characterized in that each rotary shaft comprises a first part mounted rotatably, through said lateral apertures, on said lateral wall of said container and a second part disposed cantilevered inside said internal cavity, and in that said movement means comprise a plurality of blades mounted radially on said second part of said rotary shaft and defining corresponding containing cells configured to contain said material coming from said first zone and to move it, due to the effect of the rotation of said rotary shaft, from said first zone toward said discharge aperture. - a container having a substantially vertical longitudinal axis and at least one lateral wall that defines an internal cavity, said lateral wall being provided with a plurality of through lateral apertures, which put said internal cavity into communication with the outside, - a discharge device installed at least partly in said container to divide said internal cavity into a first zone disposed above said discharge device and in which said material is contained and processed, and a discharge zone disposed below said discharge device and through which said material is discharged, in a controlled manner, by said discharge device, wherein said discharge device comprises a plurality of movement members each provided with a rotary shaft disposed in one of said lateral apertures and rotatable around its axis of rotation transverse to said longitudinal axis, and movement means solid with said rotary shaft so as to move said material from the first zone toward a discharge aperture of said discharge zone characterized in that each rotary shaft comprises a first part mounted rotatably, through said lateral apertures, on said lateral wall of said container and a second part disposed cantilevered inside said internal cavity, and in that said movement means comprise a plurality of blades mounted radially on said second part of said rotary shaft and defining corresponding containing cells configured to contain said material coming from said first zone and to move it, due to the effect of the rotation of said rotary shaft, from said first zone toward said discharge aperture.