Abstract: Installation of the type according to which molten mineral, subjected to spraying with water jets, is sent onto a rotary drum, then dispersed as a shower in a closed insulating enclosure provided at its base with a system for receiving the cooled particles or pellets, includes as such drum a fluid-tight drum which is cooled by internal circulation of water in a closed circuit and provided with blades having a special profile in the shape of a scoop or chistera. Further, the receiving system includes a series of vibrating tables placed in a cascade the last table of which, the farthest from the rotary drum and receiving the contents from the upstream tables, pours all the collected dry pellets onto a hooded belt conveyor which brings the pellets to storage hoppers or silos.