FIELD: chemistry.
SUBSTANCE: borosilicate concentrates are first opened through solid-phase fluorination with ammonium hydrodifluoride with mass ratio of concentrate to ammonium hydrodifluoride equal to 1:(2.0-2.4) and temperature of about 180°C. Fluorinated products of opening are selectively extracted at temperature ranging from 250 to 410°C with subsequent processing of the obtained sublimates into end products.
EFFECT: invention allows for efficient and non-waste production of boric acid, calcium borohydride and borohydrides of other metals based on it, finely dispersed amorphous silicon dioxide and calcium fluoride.
10 cl, 1 tbl, 2 ex
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