METHOD OF DRYING BORON-CONTAINING MINERALS Russian patent published in 2014 - IPC C01B35/12 C09K8/68 F26B3/00 

FIELD: chemistry.

SUBSTANCE: inventions can be used in field of chemistry, as well as in field of processing subterranean formations. Method includes stages of supply of boron-containing material, selected from the group, consisting of ulexite, probertite, kernite and their mixtures, introduction of boron-containing material into preliminarily heated to temperature from 426.7°C to 537.8°C furnace, as well as its heating for from approximately 5 min to approximately 120 min, removal of boron-containing material from furnace and cooling it to room temperature. Obtained is product with boron content within the range from 20% to 40% and time of cross-linking, determined by Vortex Closure Test method, which constitutes from 35% to 95% counted for the time of cross-linking with application of initial material, or increased time of cross-linking from 45% to 90% in comparison with the time of cross-linking of initial material. Obtained product is used as linking agent for obtaining liquid for performing fracture of subterranean formations.

EFFECT: inventions make it possible to ensure fast and effective drying of boron-containing compounds, with obtaining compounds, characterised by content of accessible boron exceeding 10 wt % and reduction of linking time, as well as resistance to moisture absorption.

18 cl, 1 dwg, 5 tbl, 3 ex