METHOD FOR PROCESSING OF DATOLITE CONCENTRATE Russian patent published in 2020 - IPC C01B35/00 

FIELD: technological processes.

SUBSTANCE: invention relates to a method of processing boron-containing material, in particular a datolite concentrate, and can be used to produce boric acid and boric anhydride. Method involves mixing datolite concentrate with ammonium sulphate (NH₄)₂SO₄ with weight ratio of ammonium sulphate to concentrate 2.0–2.1:1, heating reaction mixture at rate of 1–2 °C/min from room temperature to 310–330 °C with holding at the achieved temperature for 5.0–5.5 hours, pulping of obtained solid mass after cooling in water at S:L=0.5–1:1, evaporation of pulp to gel-like state, heating to 500–510 °C, holding at the achieved temperature for 2.0–2.5 hours, leaching of the cooled product with water at S:L=1:5–7 and temperature of 90–95 °C to obtain a solution of boric acid, evaporation of solution until crystallisation begins and precipitation of boric acid, separation and purification of precipitate.

EFFECT: invention simplifies the method of processing boron-containing raw material and its hardware, as well as increases its economic efficiency and environmental safety.

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