Use of high-absorption-capacity precipitated silica for the production of a colorant by means of impregnation with an inorganic pigment, the colorant thus obtained and the application thereof in the colouring of ceramic materials

摘要

The invention relates to the use of precipitated silica having a DOP oil absorption of at least 260 ml/100 g as a raw material in order to produce a colorant by impregnating said silica with an inorganic pigment in the form of a soluble salt and, in particular, with an inorganic pigment based on soluble iron sulphate. The invention also relates to a colorant that can be produced by calcinating and, optionally, grinding a precipitated silica with a DOP oil absorption of at least 260 ml/100 g which has already been impregnated using an inorganic pigment in the form of a soluble salt, such as a soluble iron sulphate-based inorganic pigment. The colorant thus obtained can be used to dye ceramic materials, such as ceramic tiles, and bituminous or hydraulic binding materials.