USE OF PRECIPITED SILICA IN THE FORM OF SUBSTANTIALLY SPHERICAL BALLS FOR THE OBTAINING OF A COLOR, COLORING THUS OBTAINED AND APPLICATION TO THE COLORING OF CERAMIC MATERIALS

摘要

The invention relates to the use of precipitated silica in the form of substantially spherical beads, of average size of at least 50 m, having a DOP oil uptake of at least 260 ml / 100 g, as raw material for obtaining a dye by impregnating said silica with an inorganic pigment in the form of a soluble salt, in particular with an inorganic pigment based on soluble iron sulphate. It also relates to a dye that can be obtained by calcination, and then optionally grinding, a precipitated silica in the form of substantially spherical beads, of average size of at least 50 m, having a DOP oil uptake of at least 260 ml / 100 g, previously impregnated with a pigment inorganic in the form of soluble salt, especially an inorganic pigment based on soluble iron sulfate.The dye obtained can be used for coloring ceramic materials, such as tiles or ceramic floor tiles, e t materials with hydraulic binder.