The present invention relates to a method for producing a granulate from waste glass for the manufacture of mineral wool products, such as mineral wool board or mineral wool web, in particular biosoluble glass wool obtained with the aid of at least one spinner having the form of a spinner basket, the peripheral wall of which includes a multiplicity of small-diameter outlet orifices through which a molten glass material is spun off in the form of filaments that are subjected to a supplementary attenuating action of a preferably downwardly directed gas flow, wherein a part of the molten glass material is constituted by glass fragments including foreign matter proportions in a ground form, the granulometry of which is the same size or smaller than the smallest diameter of the outlet orifices in the peripheral wall of the spinner.