11results about "Mangesium aluminates" patented technology

A manufacturing apparatus (1A) includes a first gas introduction portion (20) provided on one end portion (10a) side of a calcination furnace (10) to introduce a gas into the calcination furnace (10), a gas discharge portion (30) provided on the other end portion (10b) side of the calcination furnace (10) to discharge the gas in the calcination furnace (10) to the outside, and a conveying apparatus (40) to convey a metal compound and a flux from the gas discharge portion (30) side to the first gas introduction portion (20) side. The calcination furnace (10) has a temperature increasing region (12A), a cooling region (14A), and a reaction region (13A) provided between the temperature increasing region (12A) and the cooling region (14A) and causing the metal compound and the flux to react. In the manufacturing apparatus (1A), a gas flow (AF1) generated by the gas introduced from the first gas introduction portion (20) causes the flux gasified in the reaction region (13A) to be powdered in the cooling region (14A), and the gas containing the powdered flux is sent to the gas discharge portion (30).

The invention belongs to the technical field of asbestos tailing utilization, and particularly discloses an asbestos tailing full-resource utilization process. The method provided by the invention comprises the following steps: crushing and sieving asbestos tailings, adding a sulfating roasting reagent and ammonium bisulfate to obtain a mixed material, and roasting the mixed material in a fluidized bed; after heat preservation treatment, water is added for a leaching reaction, and leaching residues and filtrate are obtained through solid-liquid separation; adjusting the pH value of the filtrate to obtain a mixed precipitate of ferric hydroxide and nickel hydroxide and a sulfate solution, performing evaporative crystallization on the sulfate solution, and performing roasting treatment to obtain a mixed oxide; and adding aluminum powder into the mixed oxide, and carrying out aluminothermic reduction reaction to obtain the magnesium ingot. According to the method, high-valued utilization of various elements in the asbestos tailings can be achieved, circular economy and closed-loop utilization can also be achieved, and the economic effect of enterprises is improved.

This invention provides a method for calcining dolomite, a carbonization method, a calcium-magnesium separation method, and a comprehensive utilization method. The comprehensive utilization method of dolomite includes: calcining dolomite powder to obtain calcined white powder; subjecting the calcined white powder to digestion and aging treatments sequentially to obtain an aging liquid; carbonizing the aging liquid to obtain a carbonization reaction liquid; performing solid-liquid separation on the carbonization reaction liquid to obtain heavy magnesium water and a first solid separate; pyrolyzing the heavy magnesium water to obtain a pyrolysis reaction liquid; performing solid-liquid separation on the pyrolysis reaction liquid to obtain a decomposition liquid and a second solid separate; calcining the second solid separate with magnesium carbonate to obtain magnesium oxide; and reducing the magnesium oxide to obtain metallic magnesium and magnesium aluminum spinel. This invention achieves comprehensive utilization of dolomite resources, with no waste residue or exhaust gas emissions. The main product is metallic magnesium, and the by-products are light calcium carbonate, magnesium aluminum spinel, and solid carbon dioxide.

The present invention provides an optimized method for recovering high-purity lithium sulfate from a lithium-containing composite oxide deposited on an eroded surface of a waste sagger discarded. Therefore, when the method for producing high-purity lithium sulfate from a waste sagger of the present invention is used, it is expected not only to be able to produce high-purity lithium sulfate that can be used for manufacturing lithium secondary batteries by recycling a discarded waste sagger, but also to be able to recycle a positive electrode active material, iron oxide, alumina, silicate, and calcium carbonate obtained as by-products during the production process of the lithium sulfate.

This invention relates to a doped yttrium oxide flake powder, its preparation method, and its applications. The method uses 0.2-0.4 M Y(NO₃)₂. 3 ) 3 ·6H 2 O solution as Y 3+ Source, then add MgCl to the solution 2 and Al(NO 3 ) 3 ·9H 2 O was used as a dopant. After adjusting the pH of the mixed solution to 8-10, a hydrothermal reaction was carried out at 170-200°C for 9-15 hours to achieve uniform distribution of the dopant in the yttrium oxide lattice. Finally, the powder was calcined at 600-700°C for 3-5 hours to improve the structural stability and properties of the material. The synthesized doped yttrium oxide powder had a plate-like morphology with a particle size between 5-25 micrometers, and the final product composition included Y. 2 O 3 MgAl 2 O 4 And Y-Al-O compounds. Compared with traditional physical doping methods, the preparation method of this invention not only achieves a more uniform doping effect, but also shows significant advantages in terms of energy consumption, cost, and particle size control. The doped yttrium oxide obtained by this method has performance superior to or equivalent to high-purity yttrium oxide, providing a new avenue for the further application and development of yttrium oxide.

This invention provides a method for surface modification of lithium-rich manganese-based cathode materials, comprising: (1) dissolving a polymer with multiple carboxyl functional groups in deionized water to obtain a coating agent aqueous solution of 0.1–10 mg / mL; (2) dissolving a soluble inorganic salt containing a modified metal element in deionized water to obtain a metal precursor solution; (3) uniformly dispersing the lithium-rich manganese-based cathode material in the coating agent aqueous solution, and then adding the metal precursor solution, or mixing the coating agent aqueous solution and the metal precursor solution before uniformly dispersing the lithium-rich manganese-based cathode material therein; (4) washing and filtering the reactants obtained in step (3), and then heat-treating them under an oxygen-free atmosphere to form a metal ion gradient doping in the lithium-rich manganese-based cathode material, and forming a metal oxide layer, a spinel phase, and a carbon layer sequentially from the inside to the outside on the surface of the lithium-rich manganese-based cathode material. This invention improves the comprehensive electrochemical performance of the modified lithium-rich manganese-based cathode material.

A method for producing spinel-type aluminum oxide using a water-in-oil Pickering emulsion is provided. [Solution] The method includes the steps of: (1) mixing an aqueous dispersion of boehmite alumina sol with an aqueous solution containing one of the metal species Ni, Co, or Mg; (2) mixing a water-insoluble organic solvent with the aqueous solution from step (1) to form a phase-separated state of aqueous phase and organic solvent phase; (3) forming a water-in-oil (W / O) Pickering emulsion by applying shear to the entire liquid in the phase-separated state from step (2) to produce a spinel precursor in the organic solvent phase; (4) allowing the sheared liquid to stand to separate into an aqueous phase and an organic solvent phase; (5) removing the organic solvent phase from the phase-separated liquid from step (4); (6) drying the organic solvent phase from step (5) to obtain a cake; (7) baking the cake from step (6) at 700 to 1200°C for 2 to 8 hours; and (8) pulverizing the baked product obtained from step (7).

To provide a positive electrode active material for a secondary battery having high capacity and excellent charge / discharge cycle characteristics.SOLUTION: A positive electrode active material includes an aggregate of particles including a first particle group and a second particle group, the aggregate of particles contains lithium, cobalt, nickel, aluminum, magnesium, oxygen, and fluorine, when the number of atoms of cobalt contained in the aggregate of particles is 100, the number of atoms of nickel is 0.05 or more and 2 or less, the number of atoms of aluminum is 0.05 or more and 2 or less, and the number of atoms of magnesium is 0.1 or more and 6 or less, and when the aggregate of particles is subjected to particle size distribution measurement by a laser diffraction / scattering method, the first particle group has a first peak. The second particle group has a second peak, the first peak has a maximum value in a range of 2 μm or more and 4 μm or less, and the second peak has a maximum value in a range of 9 μm or more and 25 μm or less.SELECTED DRAWING: Figure 26

The present invention provides an optimized method for recovering high-purity lithium sulfate from a lithium-containing composite oxide deposited on the eroded surface of a waste refractory crucible to be discarded. Therefore, by using the method for producing high-purity lithium sulfate from the waste refractory crucible of the present invention, not only can the discarded waste refractory crucible be reused to produce high-purity lithium sulfate that can be used in the production of lithium secondary batteries, but it is also expected that the positive electrode active material, iron oxide, alumina, silicate, and calcium carbonate obtained incidentally in the production process can be reused.

The present invention provides a composite metal oxide that has exceptional anion adsorptivity and is capable of removing multiple types of anions, each at a high adsorption rate.　The present disclosure is a composite metal oxide represented by formula (1). The composite metal oxide has a solid base amount of 3.70 mmol / g.　Formula (1): (Mg1−xAlx)O1+x / 2 [In formula (1), x is a number that satisfies 0.18≤x≤0.45.]

The invention relates to a modified layered double hydroxide (LDH), particles comprising said modified LDH, a resin composition comprising a resin and said particles, a dispersion comprising a liquid and said particles, and a method for producing said modified LDH. The modified layered double hydroxide according to the invention comprises a modified layered double hydroxide according to formula (I), wherein: M1 and M2 are each independently a divalent metal selected from the group of Mg, Zn, Ca, Sr, Cu, Fe, Mn, Co, Ni, Sn, Pb, Cd, and Ba; in particular Mg, Zn, Cu, Fe, Mn, Co, Ni, and Cd; M3 is trivalent metal such as Al and / or Fe; in particular Al; and An− is one or more of an intercalating n-valent anion, wherein m, x, y, and z are values in the ranges represented by: 0≤m<2 0<x≤0.5 0.5≤y+z≤1 further comprising a modified outer layer wherein the outer layer is modified with an organic acid derivative or salts thereof.