# US 12,110,233 B2 · Active high purity magnesium oxide and its production method

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- Number: US 12,110,233 B2
- Document ID: US12110233B2
- Status: Granted
- Kind: B2
- Application number: 17/267,416
- Filed: 2019-08-07
- Published: 2021-09-23
- Granted: 2024-10-08
- Earliest claimed: 2018-08-09
- Assignees: Joint Stock Company Kaustik
- Applicants: Joint Stock Company Kaustik
- Inventors: Elena Petrovna Gordon; Alla Vitalievna Korotchenko; Nadezhda Illarionovna Levchenko; Igor Nikolaevich Sizykh; Tatiana Sergeevna Ugnovenok
- Web page: https://patentgrep.com/patent/US12110233B2

## CPC

- C01F 5/08: by calcining magnesium hydroxide
- C01F 5/22: from magnesium compounds with alkali hydroxides or alkaline- earth oxides or hydroxides
- C01P 2004/51: Particles with a specific particle size distribution
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2006/12: Surface area
- C01P 2006/14: Pore volume
- C01P 2006/22: Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability
- C01P 2006/80: Compositional purity
- C01F: COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts of peroxyacids C01B15/00; sulfides or polysulfides of magnesium, calcium, strontium, or barium C01B17/42; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds other than ammonia or cyanogen containing nitrogen and non-metals and optionally metals C01B21/082; amides or imides of silicon C01B21/087}; metal {imides or} amides C01B21/092, {C01B21/0923}; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanic acid C01C3/14; salts of cyanamide C01C3/16; thiocyanates C01C3/20; {double sulfates of magnesium with sodium or potassium C01D5/12; with other alkali metals C01D15/00, C01D17/00})
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

The invention is referred to chemical technology, namely to active high-purity magnesium oxide and its production method. Active high-purity magnesium oxide, including the surface treated one, has BET specific surface area from 70 to 200 m2/g, average particle size (d50) determined by laser diffraction method not more than 10 microns, iodine activity in the range from 70 to 200 mg J/g MgO, citric 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%, 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, Pb, Cd, As, Hg not more than 0.1 ppm.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

Active high-purity magnesium oxide according to claim 1 characterized by having BET specific surface area within the range from 130 to 180 m2/g.

### Claim 3 (depends on 1)

Active high-purity magnesium oxide according to claim 1 characterized by having the average particle size (d50) determined by laser diffraction method not more than 2 microns.

### Claim 4 (depends on 1)

Active high-purity magnesium oxide according to claim 1 characterized by having a mass fraction of chlorides not more than 0.02% wt.

### Claim 5 (depends on 1)

Active high-purity magnesium oxide according to claim 1 characterized by having a mass fraction of calcium not more than 0.05% wt.

### Claim 6 (depends on 1)

Active high-purity magnesium oxide according to claim 1 characterized by having a mass fraction of carbonates wt not more than 1% wt.

### Claim 7 (depends on 1)

Active high-purity magnesium oxide according to claim 1 characterized by having a mass fraction of sulphates not more than 0.01%.

### Claim 8 (depends on 1)

Active high-purity magnesium oxide according to claim 1 characterized by having a mass fraction of Iron (Fe) not more than 0.003%.

### Claim 9 (depends on 1)

Active high-purity magnesium oxide according to claim 1 characterized by having a mass fraction of manganese (Mn) not more than 2 ppm.

### Claim 10 (depends on 1)

Active high-purity magnesium oxide according to claim 1 characterized by having a mass of residue on the 150 micron sieve 0.05% not more than 0.05%.

### Claim 11 (depends on 1)

Active high-purity magnesium oxide according to claim 1 characterized by having a mass fraction of residue on the 45 micron sieve not more than 0.1%.

### Claim 12 (depends on 1)

Active high-purity magnesium oxide according to claim 1 characterized by surface treatment with one or several silane coupling agents, selected from organofunctional trialkoxysilanes group, which includes alkyl triethoxysilane, alkyl trimethoxysilanes, alkenyl triethoxysilanes, and alkenyl trimethoxysilanes and/or one or several surface treating agents selected from saturated and unsaturated fatty acids group, containing from 8 to 20 carbon atoms, which includes stearic acid, oleic acid, palmitic acid, behenic acid, myristic acid, fatty acids of tall oil and/or their salts of alkali and/or alkaline-earth metals and/or their mixtures in the amount of 0.1-5.0% of the magnesium oxide mass.