The invention relates to a high-performance compacted ceramic material, comprising between 40%-85% by weight of glassy phase, having a density between 2.3 and 3.0 g/cm3, and characterized in that it has an internal porosity of less than 4% by volume. This material is highly resistant to mechanical and chemical action, sparingly permeable and prevents staining, so it is extremely suitable as a building material, particularly for kitchen countertops.

The invention relates to a high-performance compacted ceramic material, comprising between 40%-85% by weight of glassy phase, having a density between 2.3 and 3.0 g/cm3, and characterized in that it has an internal porosity of less than 4% by volume. This material is highly resistant to mechanical and chemical action, sparingly permeable and prevents staining, so it is extremely suitable as a building material, particularly for kitchen countertops.

The present invention relates to a method of fabricating an improved lithium silicate glass ceramic and to that material for the manufacture of blocks for dental appliances using a CAD/CAM process and hot pressing system. The lithium silicate material has a chemical composition that is different from those reported in the prior art with 1 to 10% of germanium dioxide in final composition. The softening points are close to the crystallization final temperature of 800 C. indicating that the samples will support the temperature process without shape deformation.

The present invention relates to a method of fabricating an improved lithium silicate glass ceramic and to that material for the manufacture of blocks for dental appliances using a CAD/CAM process and hot pressing system. The lithium silicate material has a chemical composition that is different from those reported in the prior art with 1 to 10% of germanium dioxide in final composition. The softening points are close to the crystallization final temperature of 800 C. indicating that the samples will support the temperature process without shape deformation.

A rotary mill for grinding recycled glass materials into particles has a housing defining an impact chamber with a rotor in the chamber at the bottom of an inclined guide wall underneath the feed opening. The rotor has a plurality of axially extending, angularly spaced massive impact hammers so that the impact hammers impact and deflect the solid materials onto a plurality of shatter bars located at the peripheral wall. Each of the impact hammers has a leading blade element of a hardened steel which has a front face inclined relative to a bottom portion of the guide surface so that an outer edge of the front face is angularly advanced relative to an inner edge thereof.

A rotary mill for grinding recycled glass materials into particles has a housing defining an impact chamber with a rotor in the chamber at the bottom of an inclined guide wall underneath the feed opening. The rotor has a plurality of axially extending, angularly spaced massive impact hammers so that the impact hammers impact and deflect the solid materials onto a plurality of shatter bars located at the peripheral wall. Each of the impact hammers has a leading blade element of a hardened steel which has a front face inclined relative to a bottom portion of the guide surface so that an outer edge of the front face is angularly advanced relative to an inner edge thereof.

To provide granules for the production of silicate glass, said granules being less likely to adhere even if heated at a high temperature exceeding 800 C. A method for producing granules, which has a step of mixing a glass raw material composition composed essentially of an alkali metal source, an alkaline earth metal source and a powdery silicon source, with water, followed by compression molding, and which is characterized in that the glass raw material composition contains at least 50 mass % of the silicon source, and at least 10 mass % in total of the alkali metal source and the alkaline earth metal source, as calculated as oxides, based on 100 mass % of the silicate glass obtainable from the granules, the alkali metal source contains an alkali metal carbonate, and D90 representing the particle size at a cumulative volume of 90% in the particle size accumulation curve of the alkaline earth metal source is at most 100 m.

To provide granules for the production of silicate glass, said granules being less likely to adhere even if heated at a high temperature exceeding 800 C. A method for producing granules, which has a step of mixing a glass raw material composition composed essentially of an alkali metal source, an alkaline earth metal source and a powdery silicon source, with water, followed by compression molding, and which is characterized in that the glass raw material composition contains at least 50 mass % of the silicon source, and at least 10 mass % in total of the alkali metal source and the alkaline earth metal source, as calculated as oxides, based on 100 mass % of the silicate glass obtainable from the granules, the alkali metal source contains an alkali metal carbonate, and D90 representing the particle size at a cumulative volume of 90% in the particle size accumulation curve of the alkaline earth metal source is at most 100 m.

One aspect relates to a process for the preparation of a quartz glass body. The process includes providing a silicon dioxide granulate I prepared from a pyrogenically produced silicon dioxide powder, treating the silicon dioxide granulate I with a reactant at a temperature in a range from 1000 to 1300 C., and making a glass melt out of the silicon dioxide granulate. A quartz glass body is made out of at least a part of the glass melt. Furthermore, one aspect relates to a quartz glass body obtainable by this process. Furthermore, one aspect relates to a light guide, an illuminant, and a formed body, each of which is obtainable by further processing of the quartz glass body. One aspect additionally relates to a process for the preparation of a silicon dioxide granulate II.

One aspect relates to a process for the preparation of a quartz glass body. The process includes providing a silicon dioxide granulate I prepared from a pyrogenically produced silicon dioxide powder, treating the silicon dioxide granulate I with a reactant at a temperature in a range from 1000 to 1300 C., and making a glass melt out of the silicon dioxide granulate. A quartz glass body is made out of at least a part of the glass melt. Furthermore, one aspect relates to a quartz glass body obtainable by this process. Furthermore, one aspect relates to a light guide, an illuminant, and a formed body, each of which is obtainable by further processing of the quartz glass body. One aspect additionally relates to a process for the preparation of a silicon dioxide granulate II.