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US 12,722,980 B2Granted
High-purity magnesium oxide and method for production thereof
AssigneeJoint Stock Company Kaustik
InventorsElena Petrovna Gordon, Alla Vitalievna Korotchenko, Igor Nikolaevich Sizykh, Tatiana Sergeevna Ugnovenok
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Abstract
The invention relates to chemical technology for producing high-purity magnesium oxide used in the pharmaceutical, cosmetic, and food industries, in the production of ceramics, glasses, optical materials, electronic materials, catalysts, polymer materials, transformer steel.
Claims13
High-purity magnesium oxide,
- having a specific surface area, determined by the BET method, in the range from 5 to 70 m2/g,
- an average particle size (d50), determined by laser diffraction, of not more than 5 μm,
- wherein the high-purity magnesium oxide has a mass fraction of impurity elements of each of Pb, Cd, As, Hg of not more than 0.1 ppm,
- a mass fraction of impurity elements of each of Ba, Zn, Ti, Mn, Co, Mo, V, Sb, Sr of not more than 1 ppm,
- a mass fraction of impurity elements of each of Al, F of not more than 5 ppm,
- a mass fraction of impurity elements of each of P, Cr, Ni, K, Li of not more than 10 ppm,
- a mass fraction of Fe of not more than 50 ppm,
- a mass fraction of Si of not more than 0.01%,
- a mass fraction of impurity elements of each of Ca, B of not more than 0.02%,
- a mass fraction of sulphates SO42− of not more than 0.02%,
- a mass fraction of Na impurity of not more than 0.05%,
- a mass fraction of chloride impurity of not more than 0.05%, and
- wherein the high-purity magnesium oxide includes primary particles and agglomerates consisting of primary particles;
- and
- characterized in that the high-purity magnesium oxide has a pore volume determined by mercury porosimetry in the range from 0.9×10−6 to 1.5×10−6 m3/g.
12 more elements
Dependencies are inferred from the claim text.