FIELD: chemistry.
SUBSTANCE: proppant used to break geological formations is produced from bauxite ores and a calcium-containing compound. The proppant contains, wt %: 25-75 Al2O3, 0-70 SiO2, at least 3 CaO and less than 0.1 of cristobalite, as well as at least 5 (preferably more than 10) wt % of the calcium-containing crystalline phase constituting anorthite.
EFFECT: improved resistance to crushing of proppant.
19 cl, 3 tbl, 3 dwg
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