METHOD FOR MAGNESIUM SILICATE PROPPANT PREPARATION, AND PROPPANT Russian patent published in 2017 - IPC C09K8/80 C04B35/20 C04B35/622 C04B35/64 

FIELD: chemistry.

SUBSTANCE: method for preparation of magnesium silicate proppant, containing 18-30 wt % of MgO, from raw materials based on natural magnesium component and quartzo-feldspathic sand, includes preliminary calcination of the natural magnesium component, its grinding with quartzo-feldspathic sand, material granulation, calcination and sieving of the raw granules, Bazhenovskoye field serpentinite is used as the natural magnesium component used, containing the following in terms of calcined material, wt %: SiO₂ 38-46; MgO 38-46; Fe₂O₃ 6-12; CaO 0.2-2.1; Al₂O₃ 0.05-1.1; Cr₂O₃ 0.2-0.7; NiO 0.1-0.45; MnO 0.05-0.25; K₂O 0.002-0.2; Na₂O 0.06-0.5; trace - the rest; preliminary calcination of the said serpentinite and raw granules calcination is performed at a temperature rise rate of more than 150°C/h. Magnesium silicate proppant is characterized by being obtained by the above method.

EFFECT: increased proppant recovery ratio while maintaining its strength characteristics.

2 cl, 1 tbl, 1 ex