Method for producing a granulate of waste glass, and its use for the manufacture of mineral wool products

A method for producing a granulate from waste glass for the purposes of manufacturing mineral wool products obtainable 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 downwardly directed gas flow, wherein part of the molten glass material freighted with impurities on the basis of ceramic, stone and porcelain (CSP impurities) and passing through the spinner basket is formed of glass material with foreign matter proportions in ground form;

• wherein the waste glass having been crushed and freed from rough impurities is ground by milling the glass materials against each other, and sieved, so that the oversize particles occurring in sieving are furthermore milled in a cycle until even the CSF impurities have a granulometry the same as or smaller than the smallest diameter of the outlet orifices in the peripheral wall of the spinner, without the CSF impurities having to be separated out,
• wherein the process has the form of a glass-on-glass grinding process;
• and
• wherein the granulometry of the ground waste glasses including CSP impurities corresponding to the diameter of the outlet orifices in the peripheral wall of the spinner is approx. 0.1-2 mm.