The present invention relates to the
processing of natural
titanium-containing feedstock, mainly
ilmenite concentrate, including
ilmenite ores with a low TiO2 content, into products with high added value without generating any liquid or
solid waste. The method according to the invention comprises the following stages: digesting
ilmenite concentrate,
processing the
solid residue following ilmenite concentrate
digestion,
hydrolysis of
titanium oxychloride, washing
titanium oxides / hydroxides precipitate from impurities,
calcination of titanium oxides / hydroxides precipitate,
precipitation of iron hydroxides to obtain black, red and
yellow iron oxide pigments,
processing the
mother liquor containing
calcium chloride, regeneration of
hydrogen chloride from
ammonium chloride solution, obtaining
ammonium sulfate and
ammonium sulfate crystallization, obtaining crystalline
ammonium chloride. The resulting products are pigments,
pigment fillers, mineral fertilizers, construction materials, raw materials for the production of metals, and other products; they are used in various fields of application such as paint and coatings industry,
pulp and paper industry, in the production of plastics, in
metallurgy, in agricultural, construction industries and others.