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.
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.
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, characterized in that it 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−k 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 includes primary particles and agglomerates consisting of primary particles.
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.
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, characterized in that it 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−k 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 includes primary particles and agglomerates consisting of primary particles.
High-purity magnesium oxide is obtained by calcination of magnesium hydroxide obtained by reacting a purified concentrated aqueous solution of magnesium chloride with an aqueous solution of sodium hydroxide in a continuous manner at a temperature of 40-90° C., stirring at a speed of 20-300 rpm at a molar ratio of OH−:Mg++ ions within the range (1.9÷2.1):1 with the continuous supply of a suspension of magnesium hydroxide seed crystals into the reaction mass in an amount of 5-200% of the total mass of the supplied initial reagents, and the magnesium hydroxide seed crystals are pre-treated with a concentrated aqueous solution of magnesium chloride, after interaction of the reagents, a suspension of magnesium hydroxide is sent for aging at a temperature of 40-90° C., then hydrothermal crystallization of magnesium hydroxide particles is carried out in the presence of dihydric alcohol: ethylene glycol or propylene glycol, at a temperature in the range from 120 to 220° C., pressure in the range from 0.1 to 2.3 MPa, and a duration ranging from 1 to 10 hours, the resulting suspension of magnesium hydroxide is filtered, washed, and calcination of magnesium hydroxide is carried out at a temperature of 700-1100° C.
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.
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, characterized in that it 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−k 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 includes primary particles and agglomerates consisting of primary particles.
High-purity magnesium oxide is obtained by calcination of magnesium hydroxide obtained by reacting a purified concentrated aqueous solution of magnesium chloride with an aqueous solution of sodium hydroxide in a continuous manner at a temperature of 40-90° C., stirring at a speed of 20-300 rpm at a molar ratio of OH−:Mg++ ions within the range (1.9÷2.1):1 with the continuous supply of a suspension of magnesium hydroxide seed crystals into the reaction mass in an amount of 5-200% of the total mass of the supplied initial reagents, and the magnesium hydroxide seed crystals are pre-treated with a concentrated aqueous solution of magnesium chloride, after interaction of the reagents, a suspension of magnesium hydroxide is sent for aging at a temperature of 40-90° C., then hydrothermal crystallization of magnesium hydroxide particles is carried out in the presence of dihydric alcohol: ethylene glycol or propylene glycol, at a temperature in the range from 120 to 220° C., pressure in the range from 0.1 to 2.3 MPa, and a duration ranging from 1 to 10 hours, the resulting suspension of magnesium hydroxide is filtered, washed, and calcination of magnesium hydroxide is carried out at a temperature of 700-1100° C.
The obtained high-purity magnesium oxide has high chemical purity, adjustable specific surface area, pore volume and pore size distribution, particle size distribution and activity.
The invention is referred to chemical technology, namely to active high-purity magnesium oxide and its production method.
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.
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.
Method for the production of active high-purity magnesium oxide including the surface treated one consists of calcination of magnesium hydroxide obtained by interaction of magnesium salt solution with alkaline agent. Magnesium hydroxide crystals are produced by continuous method in divided and isolated between each other zones in the presence of seed crystals of magnesium hydroxide and liquid oil products with mole ratio of ions of alkaline agent and magnesium chloride OH−/Mg++ within the range (1.9÷2.1):1, with the temperature in all zones not less than 40° C. and magnesium hydroxide crystals suspension residence time in each isolated zone not less than 20 minutes.
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.
Method for the production of active high-purity magnesium oxide including the surface treated one consists of calcination of magnesium hydroxide obtained by interaction of magnesium salt solution with alkaline agent. Magnesium hydroxide crystals are produced by continuous method in divided and isolated between each other zones in the presence of seed crystals of magnesium hydroxide and liquid oil products with mole ratio of ions of alkaline agent and magnesium chloride OH−/Mg++ within the range (1.9÷2.1):1, with the temperature in all zones not less than 40° C. and magnesium hydroxide crystals suspension residence time in each isolated zone not less than 20 minutes.
Active high-purity magnesium oxide produced by this method has high activity and high chemical purity that allows to use it as a filler for rubbers, adhesives, plastics, polymers, as stabilizers in production of chloroprene rubbers, refining additives of organic solvents, in production of catalysts, special ceramics, special glass, in pharmaceutical, pharmacopoeial and food industries, in production of magnesia cement and other magnesium-containing materials.
A high-purity magnesium oxide has a specific surface area, determined using the BET method, in a range of from 5 to 7 m2/g; a mean particle size (d50), determined by laser diffraction, of not more than 5 μm; an impurity concentration of not more than 0.1 ppm for each of the elements Pb, Cd, As, Hg; an impurity concentration of not more than 1 ppm for each of the elements Ba, Zn, Ti, Мn, Со, Mo, V, Sb, Sr; an impurity concentration of not more than 5 ppm for each of the elements Al, F; an impurity concentration of not more than 10 ppm for each of the elements Р, Сг, Ni, К, Li; an impurity concentration of not more than 50 ppm for Fe; an impurity concentration of not more than 0.01% for Si; an impurity concentration of not more than 0.02% for each of the elements Са, В; an impurity concentration of not more than 0.02% for sulphates; an impurity concentration of not more than 0.05% for Na; an impurity concentration of not more than 0.05% for chlorides; and contains primary particles and agglomerates consisting of primary particles. The obtained magnesium oxide has a high chemical purity and a controllable specific surface area, pore volume, pore size distribution, particle size distribution and activity.
C01F 5/08 - Magnesia by thermal decomposition of magnesium compounds by calcining magnesium hydroxide
C01F 5/22 - Magnesium hydroxide from magnesium compounds with alkali hydroxides or alkaline earth oxides or hydroxides
C30B 7/10 - Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions by application of pressure, e.g. hydrothermal processes
3/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.
01 - Chemical and biological materials for industrial, scientific and agricultural use
02 - Paints, varnishes, lacquers
03 - Cosmetics and toiletries; cleaning, bleaching, polishing and abrasive preparations
04 - Industrial oils and greases; lubricants; fuels
05 - Pharmaceutical, veterinary and sanitary products
16 - Paper, cardboard and goods made from these materials
17 - Rubber and plastic; packing and insulating materials
20 - Furniture and decorative products
30 - Basic staples, tea, coffee, baked goods and confectionery
Goods & Services
Chemicals for use in industry, science, and photography, as well as in agriculture, horticulture and forestry, except fungicides, herbicides, insecticides and parasiticides; synthetic resins, unprocessed; plastics, unprocessed; fertilizers; fire extinguishing compositions; tempering and soldering preparations; tanning substances, namely, oils for tanning leather; adhesives for industrial purposes Paints, varnishes, lacquers; preservatives against rust and against deterioration of wood, namely, rust preservatives in the nature of a coating and wood preservatives; colorants; mordants, namely, wood mordants, mordants for leather Laundry bleaching preparations and other substances for laundry use, namely, laundry detergents, laundry starch; cleaning, polishing, scouring and abrasive preparations; soaps, namely, liquid soaps for laundry, detergent soap Industrial oils and greases; industrial lubricants Pharmaceutical preparations for medical purposes for wounds and use in dermatology; sanitary preparations for medical purposes; dietetic substances adapted for medical purposes, namely, dietetic foods adapted for medical purposes, dietetic beverages adapted for medical purposes; food for babies; medical plasters; materials for dressings, namely, gauze for dressings, wadding for dressings, bandage; material for stopping teeth, dental wax; disinfectants; preparations for destroying vermin; fungicides, herbicides Paper and cardboard; printed matter, namely, printed instructional, educational, and teaching materials in the field of safe usage of chemical products; bookbinding material; photographs; stationery; adhesives for stationery or household purposes; plastic materials for packaging, namely, plastic film for use as wrapping and packaging material for chemical industry Rubber material for recapping tires; plastic substances, semi-processed; non-conducting materials for retaining heat, namely, insulating materials, insulating coatings; soundproofing materials; insulating materials; non-metallic flexible pipes Non-modular containers, not of metal, for use in transportation and storage for commercial or industrial use Edible salt
6.
ACTIVE HIGHLY PURE MAGNESIUM OXIDE AND METHOD FOR THE PRODUCTION THEREOF
The invention relates to chemical technology and specifically to active highly pure magnesium oxide and a method for the production thereof. A method for producing active highly pure magnesium oxide, including surface-treated magnesium oxide, consists in annealing magnesium hydroxide produced by reacting an aqueous solution of a magnesium salt with an alkaline agent. Magnesium hydroxide crystals are obtained by a continuous method in zones that are separated and isolated from each other, in the presence of seed crystals of magnesium hydroxide and liquid petroleum products with a molar ratio of alkaline agent ions to magnesium chloride ions OH-: Mg++ in the range of (1.9-2.1):1, a temperature in all zones of not less than 40°С, and a dwell time for the suspension of magnesium hydroxide crystals in each isolated zone of at least 20 minutes. The invention provides an increase in the activity and chemical purity of the magnesium oxide.
01 - Chemical and biological materials for industrial, scientific and agricultural use
02 - Paints, varnishes, lacquers
03 - Cosmetics and toiletries; cleaning, bleaching, polishing and abrasive preparations
04 - Industrial oils and greases; lubricants; fuels
05 - Pharmaceutical, veterinary and sanitary products
16 - Paper, cardboard and goods made from these materials
17 - Rubber and plastic; packing and insulating materials
20 - Furniture and decorative products
30 - Basic staples, tea, coffee, baked goods and confectionery
Goods & Services
Chemicals for use in industry, science and photography, as
well as in agriculture, horticulture and forestry; synthetic
resins, unprocessed; plastics, unprocessed; fertilizers;
fire extinguishing compositions; tempering and soldering
preparations; tanning substances; adhesives for industrial
purposes. Paints, varnishes, lacquers; preservatives against rust and
against deterioration of wood; colorants; mordants. Bleaching preparations and other substances for laundry use;
cleaning, polishing, scouring and abrasive preparations;
soaps. Industrial oils and greases; lubricants. Pharmaceutical and veterinary preparations; sanitary
preparations for medical purposes; dietetic substances
adapted for medical purposes; food for babies; plasters,
materials for dressings; material for stopping teeth, dental
wax; disinfectants; preparations for destroying vermin;
fungicides, herbicides. Paper and cardboard; printed matter; bookbinding material;
photographs; stationery; adhesives [glues] for stationery or
household purposes; plastic materials for packaging. Rubber material for recapping tires; plastic substances,
semi-processed; non-conducting materials for retaining heat;
soundproofing materials; insulating materials; non-metallic
flexible pipes. Containers, not of metal [storage, transport]. Salt.
01 - Chemical and biological materials for industrial, scientific and agricultural use
05 - Pharmaceutical, veterinary and sanitary products
Goods & Services
Chemicals for use in industry, science and photography, as
well as in agriculture, horticulture and forestry;
unprocessed artificial resins, unprocessed plastics;
fertilizers; fire extinguishing compositions; tempering and
soldering preparations; tanning substances; adhesives for
industrial purposes. Pharmaceutical and veterinary preparations; sanitary
preparations for medical purposes; dietetic substances
adapted for medical use; baby food; plasters, materials for
dressings; material for dental fillings and dental
impressions; disinfectants; preparations for destroying
noxious animals; fungicides, herbicides.
01 - Chemical and biological materials for industrial, scientific and agricultural use
05 - Pharmaceutical, veterinary and sanitary products
Goods & Services
Chemicals used in industry, science and photography, as well
as in agriculture, horticulture and forestry; unprocessed
artificial resins, unprocessed plastics; fertilizers; fire
extinguishing compositions; tempering and soldering
preparations; tanning substances; adhesives for industrial
purposes. Pharmaceutical and veterinary preparations; sanitary
preparations for medical purposes; dietetic substances
adapted for medical use; baby food; plasters, materials for
dressings; material for dental fillings and dental
impressions; disinfectants; preparations for destroying
noxious animals; fungicides, herbicides.
01 - Chemical and biological materials for industrial, scientific and agricultural use
05 - Pharmaceutical, veterinary and sanitary products
Goods & Services
Chemicals for use in industry, science and photography, as well as in agriculture, horticulture and forestry except fungicides, herbicides, insecticides and parasiticides; unprocessed artificial resins, unprocessed plastics; fertilizers; fire extinguishing compositions; tempering and soldering preparations; tanning substances, namely, oils for tanning leather, sumac for tanning leather, tanning agents for use in the manufacture of leather; adhesives for industrial purposes Pharmaceutical and veterinary preparations for pain relief, treatment of intestinal bacteria, wounds *, none of the aforesaid goods being vitamin and mineral supplements ; * sanitary preparations for medical purposes; dietetic substances, namely, dietetic sugar, dietetic sugar substitutes, dietetic foods, dietetic beverages, and dietetic infusions, all adapted for medical use * none of the aforesaid goods being vitamin and mineral supplements * ; baby food; plasters for medical purposes, namely, bandage, gauze, self-adhesive materials for dressings; material for dental fillings and dental impressions; disinfectants; preparations for destroying noxious animals; fungicides, herbicides * but not including any goods in the nature of vitamin and/or mineral supplements and not including any goods containing vitamin and/or mineral supplements *
01 - Chemical and biological materials for industrial, scientific and agricultural use
05 - Pharmaceutical, veterinary and sanitary products
Goods & Services
Unprocessed artificial resins, unprocessed plastics; fertilizers; fire extinguishing compositions; tempering and soldering preparations; adhesives for industrial purposes Sanitary preparations for medical purposes * excluding the ones for skin or the prevention or treatment of acne * ; baby food; disinfectants; preparations for destroying noxious animals; fungicides, herbicides
01 - Chemical and biological materials for industrial, scientific and agricultural use
19 - Non-metallic building materials
Goods & Services
Chemicals used in industry, science, as well as in
agriculture, horticulture and forestry; fertilizers, namely,
magnesia fertilizers; chemical preparations for the
treatment of the road surface to prevent icing and deicing;
chemical additives to drilling muds; water purifying
chemicals; soil conditioning preparations;
leather-impregnating chemicals. Non-metallic building materials; non-metallic rigid pipes
for building, namely, components for the production of
magnesia cements, refractory materials, anti-freeze
concrete.
13.
Nanoparticles of flame retardant magnesium hydroxide and method of production the same
2/g, an average diameter of the secondary particles of up to 2 μm, a diameter of 10% of the secondary particles of up to 0.8 μm, a diameter of 90% of the secondary particles of up to 5 μm, with a longitudinal size of the primary particles of from 150 to 900 nm, and a thickness of from 15 to 150 nm.
Magnesium hydroxide fire retardant particles, including those which are surface-treated, having a hexagonal plate-like structure with a specific surface area not exceeding 20 m2/g, an average diameter of secondary particles not exceeding 2 microns, the diameter of 10% of secondary particles not exceeding 0.8 microns, the diameter of 90% of secondary particles not exceeding 5 microns, a longitudinal dimensions of primary particles of between 150 and 900 nanometers and a thickness of between 15 and 150 nanometers. A first stage of producing said particles involves reacting an aqueous solution of magnesium chloride with an alkaline agent at a temperature not exceeding 100°С and at atmospheric pressure, with a molar ratio of OH-:Mg++ ions equal to (1.9-2.1):1. A second stage involves the hydrothermal recrystallization of Mg(OH)2 particles at a temperature of 120-220°C and a pressure of 0.18-2.3 MPa for a period of between 2 and 24 hours. The reacting mass is periodically subjected to hydro-impacts from superheated vapor having a temperature of 160-240°С and a pressure of 0.6-3.3 MPa. The invention allows for producing magnesium hydroxide particles having adjustable dimensions, for applying same to polymer matrices without compromising the mechanical properties of the polymers.
C01F 5/22 - Magnesium hydroxide from magnesium compounds with alkali hydroxides or alkaline earth oxides or hydroxides
B82B 3/00 - Manufacture or treatment of nanostructures by manipulation of individual atoms or molecules, or limited collections of atoms or molecules as discrete units
B82Y 99/00 - Subject matter not provided for in other groups of this subclass
