Patent ID: 9018139
Filing Date: 2015-04-28
Classification: C03B,C03C,C04B,C09K

Abstract:
1. A method for manufacturing a swelling-glass granulate, comprising the following steps of: preparing starting materials, including 80% to 95% glass and 5% to 20% of a water glass hydrate with a proportion of water of crystallization portion of between 1 and 2 wt. %, relative to a solid proportion, in which the water glass hydrate acts as a swelling agent and no further swelling agents are prepared as a starting material; grinding the glass; mixing the starting materials; granulating the ground-up starting materials to a raw granulate; mixing the raw granulate with a parting compound, the parting compound exhibits a portion between 10% and 40% of the mixture including the raw granulate and the parting compound; heating the mixture including the raw granulate and the parting compound to a processing temperature that is at least as high as the lowest sintering temperature of the glass reduced by the water glass hydrate and less than the melting point of the glass, in order, in a first partial step, to close the pores at the surface of the grains of the raw granulate and, in a second partial step, to release the water of crystallization from the water glass hydrate and bring about thermal expansion, in which the grains of the raw granulate swell up and form the swelling-glass granulate; and cooling of the swelling-glass granulate.