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Method of producing lithium titanate Invention can be used in making lithium cells used in rechargeable batteries. Lithium titanate of formula Li4Ti5O12-x, where 0<x<0.02, is obtained by preparing a mixture of titanium oxide and a lithium-based component, wherein the lithium-based component and titanium oxide are present in the obtained mixture in amounts required to provide atomic ratio of lithium to titanium of 0.8. The lithium-based component includes lithium carbonate powder and lithium hydroxide powder. The obtained mixture is used as a calcination precursor. Further, the mixture is sintered in a gaseous atmosphere containing a reducing agent to form lithium titanate. The sintering step causes a solid-phase reaction between the lithium carbonate powder and titanium oxide and a liquid-solid-phase reaction between lithium hydroxide powder and titanium oxide. |
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Ferromagnetic semiconductor material Invention relates to semiconductor electronics materials and can be used to make components of spintronic devices, which combine a source and a receiver of polarised spins of charge carriers in a ferromagnetic semiconductor/nonmagnetic semiconductor/ferromagnetic semiconductor ternary heterostructure. The ferromagnetic semiconductor material is a ferromagnetic film of semiconductor titanium dioxide doped with vanadium in amount of 3-5 at % with respect to titanium, having a crystalline structure of anatase and grown on a dielectric substrate. The film of doped titanium dioxide is further implanted at room temperature with cobalt ions with a dose of (1.3-1.6)·1017 cm-2 and, at temperatures not lower than 300 °K in the absence of an external magnetic field, retains remnant magnetisation of not less than 70% of the saturation magnetisation value. |
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Coloured composition contains particulate material which scatters radiation in the near-infrared region and one or more colouring substance. The particulate material and colouring substance are dispersed. Said material is selected from titanium dioxide, doped titanium dioxide and combinations thereof, and has average crystal size greater than 0.40 mcm, and particle size distribution where 30% or more particles are smaller than 1 mcm. Material consisting of titanium dioxide particles can be used for adding to the coloured composition, said material having a coating which contains one or more oxide materials, which provides low levels of photocatalytic activity of titanium dioxide. |
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Dense layer of silicon dioxide is deposited on the surface of titanium dioxide particles from a gas phase, said silicon dioxide layer being doped with at least one doping element selected from a group which includes Sn, Sb, In, Y, Zn, F, Mn, Cu, Mo, Cd, Ce, W and Bi or mixtures thereof. A dense layer of silicon dioxide can be deposited on the surface of titanium dioxide from a liquid phase, said silicon dioxide layer being doped with at least one doping element selected from a group which includes Sb, In, Ge, Y, Nb, F, Mo, Ce, W and Bi or mixtures thereof. |
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Invention relates to a method of producing nanoparticles of a transition metal oxide coated with amorphous carbon. A liquid mixture containing as precursors at least one alkoxide of a transition metal selected from Ti, Zr, Hf, V, Nb and Ta, an alcohol and excess acetic acid with respect to the transition metal is diluted with water to obtain an aqueous solution. Precursors are contained in the solution in a molar ratio which is sufficient to prevent or significantly limit sol formation. The transition metal, carbon and oxygen are contained in said solution in a stoichiometric ratio which corresponds to the composition of nanoparticles. The aqueous solution is freeze-dried and the freeze-dried product undergoes pyrolysis in a vacuum or an inert atmosphere to obtain nanoparticles. The obtained nanoparticles can be subjected to carbothermal reduction to obtain carbide nanoparticles. |
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Titanium dioxide based pigment contains titanium dioxide particles in rutile form, having a coating. The coating contains aluminium phosphate, aluminium oxide, titanium oxide and silicon oxide. The particles are characterised by specific surface area, calculated according to a Brunauer-Emmet-Teller (BET) equation, of at least 15 m2/g. To obtain coated pigments, an aqueous suspension of uncoated titanium dioxide particles is prepared first, followed by addition of aluminium-containing and phosphorus-containing components. Further, while maintaining pH 4-9, an alkaline silicon-containing component and at least one pH regulating component, one of which is an acidic titanium-containing component, are then added. The formed suspension is then filtered, washed and dried and the precipitate is ground to obtain coated particles. |
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Invention relates to production of photocatalytic coatings of nanocrystalline titanium dioxide. Described is a composition for obtaining a photocatalytic coating based on nanocrystalline titanium dioxide with average particle size of 5-100 nm and specific surface area of 10-300 m2/g, water and a stabiliser, characterised by the following composition: TiO2 - 1-10 wt %, H2O - 85-98 wt %, stabiliser - 1-5 wt %, wherein the nanocrystalline titanium dioxide has a phase composition, 50-100% of which consists of "anatase" crystalline modification. Described is a method of preparing said composition, involving mixing titanium dioxide, water and stabiliser and subjecting the obtained mixture to ultrasound, wherein the mixture of titanium dioxide, stabiliser and water, taken in amount of not more than 10% of its total volume, is masticated for not less than 5 minutes into a homogeneous paste-like mass into which, while stirring continuously, the remaining amount of water is added, and the mixture then subjected to ultrasound with operating frequency of 35 kHz and generator power of 50 W for not more than 15 minutes at room temperature. Described is a method of obtaining a photocatalytic coating on a glass substrate using said composition, involving immersing the substrate in the composition, drying the substrate at room temperature and calcining in an atmosphere of air at temperature of 300-600°C and cooling, characterised by that, before coating, the surface of the glass substrate is first treated with a freshly prepared solution obtained from concentrated sulphuric acid and 30% hydrogen peroxide solution in volume ratio H2SO4:H2O2=7:3, and then washed with distilled water to pH 6-7 and subjected to ultrasonic treatment with operating frequency of 35 kHz and generator power of 50 W for 5-30 minutes at room temperature; the glass substrate is then immersed in the composition prepared as described above for not less than 5 minutes, dried for not less than 24 hours in the presence of a drying agent and calcined in an atmosphere of air for 10-15 minutes, and heating and cooling is carried out at a rate of not more than 1.5°C/min. |
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Invention relates to field of chemistry, in particular, to catalytic compositions, applied as catalyst. Claimed are catalytic composition, methods of its application and catalytic system. Catalytic system, which contains at least one oxide on carrier, selected from zirconium oxide, titanium oxide or mixed zirconium and titanium oxide, applied on aluminium oxide or aluminium oxyhydroxide carrier, and which has after burning at 900°C for 4 hours size of particles of oxide on carrier not larger than 10 nm, if oxide on carrier is obtained on zirconium oxide base or not larger than 15 nm, if oxide on carrier is obtained on the base of titanium oxide or mixed zirconium and titanium oxide. Catalytic system contains claimed catalytic composition. |
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Invention can be used in production of electrochemical devices such as batteries. Powder of titanium suboxides contains Ti4O7, Ti5O9 and Ti6O11. Ti4O7, Ti5O9 and Ti6O11 constitute in total more than 92 wt % of powder and Ti4O7 is present in amount higher than 30 wt % of entire powder mass. Powder of said composition is used for manufacturing electrodes and such moulded articles as tubes and plates. |
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Invention can be used in cosmetic industry when producing preparations which protect the skin from UV radiation. The finely dispersed titanium dioxide-based composite contains finely dispersed titanium dioxide particles which are combined with one or more polymers containing constituent monomers in form of carboxylic acid and/or a carboxylic acid derivative represented by the formula , where R is a C1-C15 alkenyl group, wherein hydrogen atoms can be substituted with a carboxyl group or a hydroxyl group; and X is a hydrogen atom or an alkali metal or a polyoxyethylene or polyoxypropylene group with 1-12 bonded moles. The average peak width of the maximum diffraction intensity assigned to titanium dioxide crystals is 2.0° or less in X-ray powder diffraction analysis. |
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Invention can be used in inorganic chemistry. The catalytic composition contains at least one oxide on a support, which is based on zirconium oxide, titanium oxide or a mixed zirconium and titanium oxide, deposited on a silicon oxide-based support. After firing at 900°C for 4 hours, the oxide on the support has the form of particles deposited on a support and size of said particles is not greater than 5 nm if the oxide on the support is based on zirconium oxide, not greater than 10 nm if the oxide on the support is based on titanium oxide and not greater than 8 nm if the oxide on the support is based on a mixed zirconium and titanium oxide. After firing at 1000°C for 4 hours, particle size is not greater than 7 nm if the oxide on the support is based on zirconium oxide, not greater than 19 nm if the oxide on the support is based on titanium oxide and not greater than 10 nm if the oxide on the support is based on a mixed zirconium and titanium oxide. |
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Method of producing photocatalytic materials Method of producing a solution of amorphous titanium peroxide involves mixing hydrogen peroxide and a mixture of amorphous titanium hydroxide to obtain a mixture of hydrogen peroxide and amorphous titanium hydroxide, and simultaneous heating and applying pressure higher than atmospheric pressure on the mixture of hydrogen peroxide and amorphous titanium hydroxide for a period of time sufficient to form a solution of amorphous titanium peroxide. In the second version of the method of producing a solution of amorphous titanium peroxide, a wetting agent is added during the mixing operation and the obtained mixture is processed while simultaneously heating and applying pressure for a period of time sufficient for formation of a solution of amorphous titanium peroxide. |
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Method of producing titanium-containing product Invention can be used in production of titanium-containing pigments and sorbents. 5-20% ammonia solution is added to titanium sulphate solution with TiO2 concentration of 50-100 g/l and pH 1.25-2.5 to achieve pH 0.2-0.5 with formation of a titanium hydroxide dispersion. The obtained dispersion is heated to 50-70°C, held for 1.0-1.5 hours and added to solution of a precipitation agent to form a titanium-containing precipitate in form of microgranules. The solution of precipitation agent used is 20-25% ammonia solution or 50-70% phosphoric acid solution. The formed titanium-containing precipitate is separated and washed with water to pH 2-5 and then thermally treated. Thermal treatment is carried out at temperature 60-100°C to obtain a titanium-containing sorbent or at temperature 680-820°C to obtain a titanium-containing pigment. |
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Method of enriching anatase mechanical concentrates involves burning (1) an anatase concentrate in a fluidised bed furnace or a drum furnace; reducing (2) the burnt product in the fluidised bed furnace or drum furnace using a hydrogen or natural gas as a reducing agent; dry and wet separation (3) of the reduced product in a weak magnetic field in magnetic separators fitted with a permanent magnet and a drum, where the magnetic fraction formed during reduction is discarded; dry separation (4) in a strong, high-gradient magnetic field of the magnetic fraction obtained during separation in a weak magnetic field in roller or drum separators with a rare-earth permanent magnet, with extraction of silicates, secondary phosphates, monazite, calzirtite, zircolinite and uranium and thorium-containing minerals; leaching (5) of the magnetic fraction obtained from separation in strong magnetic field in mixing tanks or fluidised bed columns, with a hydrochloric acid solution; filtering the leached product on a belt filter; drying of the filtered product in a rotary drier or fluidised bed drier; oxidation (6) of the dried product in the drum furnace or fluidised bed furnace; fast cooling of the oxidised product in water or compressed air in a drum cooling device or by immersing in water; leaching (7) the fast-cooled product in mixing tanks or columns, or with hydrochloric acid or sulphuric acid; filtering the product from the second leaching (7) on a belt filter; and drying of the filtered product in a rotary or fluidised bed drier; and final dry separation (8) of the product of the second leaching in a strong, high-gradient magnetic field in roller or drum separators with a rare-earth permanent magnet, while discarding the magnetic fraction and extracting the non-magnetic fraction as the final product (P), i.e. the synthetic rutile. |
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Offered is a photobiocatalyst for producing reduced forms of nicotinamide coenzymes NADH or NADPH. The photobiocatalyst represents ferredoxin-NADP-reductase immobilised on a surface of nanopatterned mesoporous titanium dioxide TiO2 film in amount 0.8-1.24 nmole in 1 cm2 of the film surface. The film is prepared of nanocrystalline titanium dioxide of size 15-25 nm and specific surface 50-100 m2/g on a glass substrate or on a glass substrate with a an electrically conductive composition. Also, offered is a photocatalytic method for producing the reduced forms of nicotinamide coenzymes NADH or NADPH with using the photobiocatalyst of ferredoxin-NADP-reductase immobilised on the surface of nanopatterned mesoporous titanium dioxide TiO2 film. The photobiocatalyst allows high speed and specific NADH or NADPH production of NAD+ or NADP+ under exposure to light. |
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Method of producing titanium dioxide Invention relates to production of titanium dioxide used in making photoactive catalysts, organosilicon and Thiokol sealants. Ammonium and titanyl sulphate are preheated to temperature 650-850°C at a rate of 3-10 deg/min in the presence of a zinc compound and then thermally treated at that temperature for 0.2-5.5 hours. The zinc compound used is zinc carbonate or zinc nitrate, taken in amount of 0.05-0.25 wt % in terms of ZnO relative the content of TiO2 in ammonium and titanyl sulphate. The gas phase which contains volatile ammonium and sulphur compounds is trapped with dilute ammonium solution to obtain ammonium sulphate. |
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Composition for making thin film based on system of double oxides of zirconium and titanium Invention can be used in electronic engineering, lighting and construction industry. The composition is obtained by preparing a film-forming solution based on 96 wt % ethyl alcohol, 6.68-10.02 wt % crystalline hydrate of zirconium oxochloride and 3.34-5.01 wt % tetraethoxytitanium. The obtained solution is deposited onto a substrate and thermally treated. |
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Invention can be used in chemical, construction and other industries. A titanium dioxide based carbonaceous photocatalyst is proposed, having more efficient light absorption in the λ≥400 nm range compared to pure titanium dioxide, and characterised at temperature 5 K by electron paramagnetic resonance (EPR) spectrum with only one intense signal in the interval of values of g from 1.97 to 2.05, as well as by an X-ray photoelectron spectrum in which the intense absorption band for bond energy of 285.6 eV relates to the Ols band at 530 eV. To prepare such a photocatalyst, a titanium compound with BET specific surface area of at least 50 m2/g is thoroughly mixed with carbonaceous substance and the mixture is thermally treated at temperature not above 400°C. Carbon content in the photocatalyst ranges from 0.05 to 4 wt %. |
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Method of producing hydrate of metal oxide Method of producing a hydrate of a metal oxide involves treatment of a metal salt with ammonia gas, separation of hydrate residue from the suspension with formation of a solution which contains an ammonium salt, washing the hydrate residue and drying. The metal salt used is an aluminium, titanium or zirconium salt in form of crystalline hydrates with particle size of 0.1 to 3.0 mm. Metal salts are treated with ammonia gas by passing ammonia gas through a layer of particles of crystalline hydrates until pH of aqueous extraction of the reaction mass of not less than 7. The obtained reaction mass is leached with water or a solution from washing the hydrate residue with formation of a suspension, from which the hydrate residue is separated. |
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Chemical reactions with reduced moisture content Method of continuous production of titanium suboxides involves continuously feeding titanium dioxide into a reaction chamber, counter-flow feeding a gaseous reducing agent, which basically does not contain moisture, into the reaction chamber, reacting the said titanium dioxide with the gaseous reducing agent, removal of excess gas which contains moisture, and continuous collection of titanium suboxides. The gaseous reducing agent can be fed into the reaction chamber to create a moisture-containing reducing atmosphere in the reaction chamber, heated to temperature above 1200°C. The gaseous reducing agent used is one or more groups containing carbon monoxide, methane, propane or other hydrocarbons. A device for producing titanium suboxides is proposed. |
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Method of obtaining titanium concentrates involves processing anatase concentrates obtained from mechanical preparation in the following sequence: burning (A), reduction with gas (B), magnetic separation of the reduced product in a weak field (C), magnetic separation in a strong field of the non-magnetic fraction, obtained from magnetic separation in a weak field (D), leaching the product of magnetic separation in a strong field with hydrochloric acid (E), filtration and dehydration of the leached product, high-temperature oxidation of the dehydrated material (F), water hardening of the oxidation product (G), leaching the hardened product with hydrochloric acid (H), filtration and drying of the product of second leaching and magnetic separation in a strong field (I). The non-magnetic fraction of the last magnetic separation becomes the final product. Alkaline solution from first and second leaching is fed into a device for extracting rare earth elements and recycling HCl (J). |
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There is disclosed application of TiO2 and/or ZnO second element doped, or recovered ZnO, in a polymer composition to reduce its strength reduction or decolouration, herewith containing one or more polymer substances and one or more organic or inorganic components being photosensitive and/or decomposing as treated by the other component of the composition. |
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Method of obtaining modified titanium dioxide Modification of titanium dioxide by metal oxides involves titanium dioxide treatment in water suspension by solutions of magnesium, or aluminium, or nickel formiates obtained by reaction of aqueous formic acid solution with the indicated metals or their carbonates or hydroxides. Formic acid quantity is stechiometric or exceeds stechiometric quantity by 20-100%. Further the suspension is dried in dispersion dryer with heating of titanium dioxide with applied salts at 200-700°C for 1-60 minutes. |
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Method of processing titanium-silicon containing concentrates with production of artificial rutile Method can be implemented in rare metals industry at processing of titanium-silicon containing concentrates for production of artificial rutile. The method includes mixing of concentrate with a leaching reagent, thermo treatment and leaching with creating of titanium dioxide sediment. At that mixing of the source concentrate is carried out with the use of concentrated solution of sodium hydroxide as a leaching reagent. Produced pulp is thermo treated by heating it at a rate of 5-8°C/min to a temperature of 480-520°C and successive conditioning at that temperature within 2.0-2.5 hrs. An immediate product of thermo treatment is subject to leaching. |
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Method of preparation of mesoporous nanostructured films of titanium dioxide consists in coating of hard base with water-containing composition on the basis of titanium dioxide, which contains stabiliser and cellulating polymer, further drying and calcination. In order to prepare the water-containing composition, the powder of titanium dioxide nanocrystals is used with the average size of particles from 6 to 25 Nm and with specific surface of 50-300 m2/g, which is mixed with stabiliser and exposed to ultrasonic disaggregation. Then cellulating polymer is added in the amount of 10-30% from titanium dioxide mass and water solution of soap up to mass proportion of TiO2:H2O=1:1-10. The prepared paste is homogenised with ultrasound, coated on the base, dried at room temperature and calcinated in the presence of air or oxygen at temperature of 400-600°C. In the method of ferment immobilisation, the ferment is adsorbed on the surface of prepared nanostructured mesoporous film of titanium dioxide in the medium of buffer solution with pH less than 8. |
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The invention may be used for production of the powdery titanium dioxide using the chloride process engineering. The installations for the synthesis of the titanium dioxide contains: the plasmatron (1), to which the source (2) of oxygen or the oxygen-containing gas is connected; the plasma-chemical reactor (3) connected to the consumption tank (4); the device (5) used for feeding of the titanium tetrachloride; the hardening chamber (6); the single-pipe heat exchanger (8) of the "the pipe inside the pipe" type; the synthesis products separation block (10). The synthesis products separations block consists of the cyclone (11) and the screen (13). The hardening chamber has the cylindrical body, the cone bottom of which is connected to the hopper (21) with the coarse fractions of titanium dioxide and to the radially arranged outlet fitting pipe (9). The hardening chamber is additionally supplied with the pneumoimpulsive generator (7). The trunk (14) of the pneumoimpulsive generator is mounted in the lower part of the cylindrical body coaxially and diametrically opposite to the radial outlet fitting pipe (9). The cyclone of the synthesis products separation block, which inlet is connected to the heat exchanger (8,) is made with the axially symmetric leveling chamber (15), which is coaxially arranged between the body and the discharge pipe (17) at the following ratio of the geometrical parameters: d/D = (0.l÷0.7), where "d" is the maximum diameter of the leveling chamber; "D" is the diameter of the cylindrical body. The method of the synthesis of the titanium dioxide provides that refrigerating of the reaction products after the hardening chamber is exercised at the flow of the dust-gas stream in the single-pipe heat exchanger of the " a pipe inside the pipe" type with the mass speed - the mass stream density from 5 up to 80 kg/ms. The invention allows to boost efficiency and reliability of the installation operation for the synthesis of the titanium dioxide. |
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Method for treating of titanium dioxide Method involves treating calcined titanium dioxide at elevated temperatures using aqueous solution containing one or more ammonium compounds; separating titanium dioxide from aqueous solution and drying titanium dioxide. Ammonium compounds preferably used in treatment process are ammonium acetate or ammonium chloride. |
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Method of producing titanium dioxide and silicon carbide from abrasive processing waste Invention relates to waste processing technology, wherein waste contains titanium and silicon compounds, and can be used to improve environmental situation and also to extend source of raw materials to produce commercial products such as titanium dioxide and silicon carbide. Production thereof from abrasive processing waste involves acid treatment of titanium-containing raw material and isolation of desired products. Raw material utilized is titanium-based abrasive processing waste. Waste is preliminarily subjected to drying, removal of textile tails, and subsequent separation of titanium constituent from silicon carbide on electromagnetic rolling analyzer operated at magnetic field intensity 10000-12000 Oersted. Titanium constituent is treated with sulfuric acid to produce titanium dioxide. |
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The invention is pertaining to the field of nonferrous metallurgy, in particular, to the fluoride method of titanium raw reprocessing, for example, reprocessing of the ilmenite concentrates at production of titanium dioxide. The reactor contains: the housing including a shell, the ends of which are overlapped by the butt walls; the tool of stirring of the reactionary components supplied with the drive of rotation arranged outside the cavity of the reactor; the charging and discharging units. The heat-feeding unit is arranged outside the concavity of the reactor. The surface of the cavity of the reactor housing is made out of magnesium or silicon oxide or magnesium. The components of the reactor housing are connected hermetically. The charging unit and the discharging unit are made with a capability of sealing. The invention improves reliability and operability of the reactor in conditions of usage of the highly aggressive fluoride-containing materials. |
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The invention is pertaining to the fluoride methods of processing of titanium-containing raw materials, for example, ilmenite concentrates at production of titanium dioxide. The reactor contains a body including a tubular wall with a bottom and a cover. The driving shaft with stirrers is located in a cavity of the reactor. The heat-supply unit is placed outside the cavity of the reactor. The reactor has a loading unit and an unloading unit. The surface of the cavity of the body of the reactor is made out of magnesium; the surfaces of the details located in the cavity of the reactor is made out of a material resistant to action of solutions of fluoride-containing reactants. Components of the body are connected hermetically and the loading unit and unloading unit are made with a capability to be sealed. The cover of the reactor is supplied with a gas outlet line branch pipe supplied with the shutoff valves. In the bottom of the reactor there is an unloading gate. The invention allows to improve reliability and serviceability of the reactor in operations with usage of a highly aggressive reactant, excludes losses of quality of the final product. |
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The invention is pertaining to the fluoride methods of processing of titanium-containing raw materials, for example, ilmenite concentrates at production of titanium dioxide. The reactor contains a body including a tubular wall with a bottom and a cover. The driving shaft with stirrers is located in a cavity of the reactor. The heat-supply unit is placed outside the cavity of the reactor. The reactor has a loading unit and an unloading unit. The surface of the cavity of the body of the reactor is made out of magnesium; the surfaces of the details located in the cavity of the reactor is made out of a material resistant to action of solutions of fluoride-containing reactants. Components of the body are connected hermetically and the loading unit and unloading unit are made with a capability to be sealed. The cover of the reactor is supplied with a gas outlet line branch pipe connected to a unit of utilization of the gaseous products of the reaction. In the bottom of the reactor there is an unloading gate. The invention allows to improve reliability and serviceability of the reactor in operations with usage of a highly aggressive reactant, excludes losses of quality of the final product. |
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Installation for processing of materials The invention is pertaining to the equipment for materials processing and the fluoride methods of processing of titanium-containing raw materials, for example, ilmenite concentrates. The installation for processing of materials contains a reactor made in the form of a cylindrical body, a means of stirring of reactive components, a heating unit located outside a cavity of the reactor, a loading and an unloading units. At that the means of stirring of the reactive components is made in the form of the rotary drive of the body of the reactor. The installation is supplied with an additional reactor made in the form of a cylindrical body, supplied with a rotary drive, a loading unit and an unloading unit and a heating unit. The internal surface of the main reactor is made out magnesium, and such a surface of the additional reactor - out of silicon oxide. The unloading unit of the main reactor is hermetically coupled with the loading unit of the additional reactor. Both reactors are supplied with the gas outlet line branch pipes and the steam conduits for the superheated steam feeding in. The invention improves reliability and service capability of the installation in operations with usage of a highly aggressive fluoride-containing materials, ensures the high efficiency of the process and allows to reach the purity of titanium dioxide up to 100 %. |
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The invention is pertaining to the field of equipment and methods of fluorine processing of titanium-containing raw materials, for example, ilmenite concentrates at production of titanium dioxide. The reactor installation contains the reactor coupled with the sources of reactants, which through a discharge assembly is connected with apparatuses of the subsequent processing of the reaction products. At that as the sources of the reactants they use a hopper - for a solid titanium-containing material, for example, ilmenite, and the source of ammonium fluoride. The discharge assembly contains a filtrate outlet, a slurry outlet and a gas outlet. At that the gas outlet of the reactor is fused to an ammonia feeder, the reactor filtrate outlet is fused to the first screen, a filtrate outlet of which is coupled to the second screen, the filtrate outlet of which is coupled to the cavity of a hydrolysis reactor, the outlet of which is in turn coupled to the third screen, the slurry outlet of which is coupled to the dryer-dispenser, the slurry outlet of which is coupled to the charging assembly of the reactor of pyrohydrolysis, the outlet of which is coupled to a container for storage of a satin white. At that the gas outlets of the second screen, the dryer-dispenser, the third screen and the reactor of pyrohydrolysis are coupled to the source of ammonium fluoride. Besides the ammonia feeder is coupled to the second screen and to the cavity of the reactor of hydrolysis. At that the source of ammonium fluoride is additionally coupled to the cavity of the reactor of hydrolysis. Besides the slurry outlets of the reactor and the first screen are coupled to the container for storage of the slurry. At that the cavity of the reactor of pyrohydrolysis is coupled to the source of steam through the steam conduits. The invention allows to improve reliability and serviceability of the installation at usage of the highly-corrosive fluorine-containing materials during processing of titanium-containing raw material with production of white pigment, to ensure the high completeness of utilization of the raw materials, the high yield and whiteness of the product, and to simplify of the process of production. |
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The invention is pertaining to the field of equipment and methods of fluorine processing of titanium-containing raw materials, for example, fluorine processing of ilmenite concentrates, at titanium dioxide production. The reactor installation contains the reactor coupled with the sources of reactants, which through a discharge assembly is connected with apparatuses of the subsequent processing of the reaction products. At that the reactor, devices and components of the installation are made out of a material resistant to action of the contacting with them corrosive materials. |
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Method for preparing titanium dioxide Invention relates to technology for preparing titanium dioxide. Method for preparing titanium dioxide involves electrochemical oxidation of metallic titanium in sodium hydroxide alkaline solution with the concentration 45-46.5 wt.-% at density of alternating sinusoidal current of industrial frequency 1.5-2.0 A/cm2 and temperature 70-90°C and thermal treatment at 110-900°C. Invention provides enhancing quality of product due to diminishing particle sizes and elevating specific surface square. |
Another patent 2513483.