US 12,110,233 B2
Active high purity magnesium oxide and its production method
Elena Petrovna Gordon, Volgograd (RU); Alla Vitalievna Korotchenko, Volgograd (RU); Nadezhda Illarionovna Levchenko, Volgograd (RU); Igor Nikolaevich Sizykh, Volgograd (RU); and Tatiana Sergeevna Ugnovenok, Volgograd (RU)
Assigned to JOINT STOCK COMPANY KAUSTIK, Volgograd (RU)
Appl. No. 17/267,416
Filed by JOINT STOCK COMPANY KAUSTIK, Volgograd (RU)
PCT Filed Aug. 7, 2019, PCT No. PCT/RU2019/000558
§ 371(c)(1), (2) Date Feb. 9, 2021,
PCT Pub. No. WO2020/032829, PCT Pub. Date Feb. 13, 2020.
Claims priority of application No. RU2018129348 (RU), filed on Aug. 9, 2018.
Prior Publication US 2021/0292180 A1, Sep. 23, 2021
Int. Cl. C01F 5/08 (2006.01)
CPC C01F 5/08 (2013.01) [C01P 2004/61 (2013.01); C01P 2006/12 (2013.01); C01P 2006/14 (2013.01); C01P 2006/80 (2013.01)] 12 Claims
 
1. Active high-purity magnesium oxide having:
BET specific surface area from 70 to 200 m2/g,
average particle size (d50) determined by laser diffraction method not more than 10 microns,
characterized by having iodine activity in the range from 70 to 200 mg J/g MgO, citric acid activity not more than 40 s,
pore volume in the range from 3.2×10−2 cm3/g to 10.2×10−2 cm3/g,
diameter of 10% of the particles not more than 2 microns,
diameter of 90% of the particles not more than 30 microns,
mass fraction of residue on the 150 micron sieve not more than 1%,
mass fraction of residue on the 45 micron sieve not more than 2%,
dynamic viscosity of an aqueous suspension of not more than 30 cP,
mass fraction of chlorides not more than 0.1%,
mass fraction of calcium not more than 0.1%,
mass fraction of substances insoluble in hydrochloric acid not more than 0.05%,
mass fraction of iron not more than 0.005%,
mass fraction of impurities of each of Ti, Co, Mo, V, Sb, Ba cations not more than 1 ppm, and mass fraction of impurities of each of Pb, Cd, As, Hg not more than 0.1 ppm.