ALUMOSILICON COMPOSITION FOR PROPANT PRODUCTION Russian patent published in 2008 - IPC C04B35/16 

FIELD: chemistry.

SUBSTANCE: invention relates to technology of production of ceramic granulated materials and can be used for production of wedging agents, i.e. propants for needs of oil and gas industries. Alumosilicon composition for propant production includes preliminary thermo-modified kaolin with the following ratio of composition components, weight %: thermo-modified kaolin 50-90; additive 10-50, the ratio Al₂O₃ : SiO₂ in the composition being not less than 0.75. As thermo-modified kaolin used is powder with the average grain size of main fraction not greater than 20 mcm, which contains not less than 37 weight % mullite and is obtained by grinding granules formed from the mixture of the following composition, weight %: kaolin 80-85, mullite-siliceous ceramics 5-10; talc 3-7; plastic fire-proof clay 3-7, dried at temperature of 550-700°C and burned at temperature of 1360-1440°C. Additive to thermo-modified kaolin is mixture of kaolin, mullite-siliceous ceramics and plastic fire-proof clay, with their following ratio, weight %: kaolin 27.5-50; mullite-siliceous ceramics 5.0-60; plastic fire-proof clay 12.5-45.

EFFECT: expansion of source of raw materials for production of propants based on kaolin.