Production of ceramic pigments with anorthite structures using nepheline sludge

For the most part, industrial ceramic pigments are synthesized from reagent-grade salts or oxides [1]. The use of nontraditional material in the composition of pigments would make it possible to substantially reduce their production cost. We made ceramic pigments with anorthite structures using nepheline sludge. In the reaction to obtain pigments with anorthite structure, the chromophores were added to a mixture of nepheline sludge, natural mineral kaolinite, aluminum oxide and silicon oxide, ensuring the stoichiometric composition of anorthite, The pigments were fired at temperatures of 1000 ―1200°C They can be recommended to supplement pigments of spectral colours and of bulk coloring of ceramic pastes and glazes.