Complex processing of titanium-containing mineral raw materials using a mixture of hydrodifluoride and ammonium sulfate

Abstract

The results of a study of the opening of titanium-containing mineral raw materials with a mixture of NH₄HF₂ and (NH₄)₂SO₄ were presented. It has been established that at first, at temperatures up to 200 °C, fluorination of the components included in the concentrate occurs with the formation of complex and simple fluorides. A further temperature increase is accompanied by the decomposition of ammonium sulfate with the formation of NH₄HSO₄, which leads to the conversion of the formed fluorides of the concentrate elements into soluble double sulfates. It was shown that water leaching of the product of the decomposition of a titanium-containing mineral raw material with a mixture of NH₄HF₂ and (NH₄)₂SO₄ makes it possible to extract the components of the mineral raw material into a solution, from which, when heated, titanium is extracted in the form of titanium dioxide in the form of anatase and, by the method of stepwise neutralization, iron, calcium and REE are separated in the form of hydroxides.