Results of the investigation on production of mineral fillers from phosphorite processing slag are represented in the paper. Effects of particle size, concentration of soda in original solution, duration and temperature of leaching to the process were investigated. Process flowsheet for production of amorphous silicon dioxide (later in the text "white soot"), calcium carbonate and silicate (later in the text "carbonate cake") was designed. These products are used as mineral fillers in rubber and paint industry and production of construction materials.
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