67results about "Ferrous oxides" patented technology

The present invention is a positive electrode active material that can be used in secondary lithium and lithium-ion batteries to provide the power capability, i.e., the ability to deliver or retake energy in short periods of time, desired for large power applications such as power tools, electric bikes and hybrid electric vehicles. The positive electrode active material of the invention includes at least one electron conducting compound of the formula LiM¹_x−y{A}_yO_z and at least one electron insulating and lithium ion conducting lithium metal oxide, wherein M¹ is a transition metal, {A} is represented by the formula Σw_iB_i wherein B_i is an element other than M¹ used to replace the transition metal M¹ and w_i is the fractional amount of element B_i in the total dopant combination such that Σw_i=1; B_i is a cation in LiM¹_x−y{A}_yO_z; 0.95≦x≦2.10; 0≦y≦x/2; and 1.90≦z≦4.20. Preferably, the lithium metal oxide is LiAlO₂ or Li₂M²O₃ wherein M² is at least one tetravalent metal selected from the group consisting of Ti, Zr, Sn, Mn, Mo, Si, Ge, Hf, Ru and Te. The present invention also includes methods of making this positive electrode active material.

The present invention is directed to the selective removal of ferric ion and/or ferric compounds from valuable metal recovery process streams.

The invention provides a processing and recycling process for silicon slurry, which comprises the steps as follows: silicon slurry is evaporated for gas and solid separation; high boiling point substances are obtained after the gas phase is condensed; the high boiling point substances react with hydrogen chloride to be cracked into mixed monomers such as methyl trichloro silicane, trimethyl chloro silicane, methyl silane, dimethyl dichloro silicane and the like; and after the fractionation, each pure monomer product can be obtained. The solid phase separated through evaporation mainly contains cuprous oxide, silicon, silicon dioxide and the like; hydrochloric acid (or sulfuric acid) is added into the solid phase to extract copper chloride (or copper sulfate, which can be sold directly) by a chemical method; and silicon and silicon dioxide are separated out. Iron powder is added into a copper chloride solution for extracting copper and ferrous chloride, and sodium hydroxide is added into the ferrous chloride solution for extracting ferrous oxide. The processing and recycling process is environment-friendly and can eliminate pollution, and meanwhile can recover various by-products from silicon slurry, thereby having well economic benefits.

A method of producing high purity nanoscale powders in which the purity of powders produced by the method exceeds 99.99%. Fine powders produced are of size preferably less than 1 micron, and more preferably less than 100 nanometers. Methods for producing such powders in high volume, low-cost, and reproducible quality are also outlined. The fine powders are envisioned to be useful in various applications such as biomedical, sensor, electronic, electrical, photonic, thermal, piezo, magnetic, catalytic and electrochemical products.

Production of nanometer ferric oxide and its apparatus are disclosed. The process is carried out by carrying pentacarboxylic-based iron or its steam by pressurized N2 or its inert gas, atomization ejecting it above 0.01Mpa from materials pipeline of reactive kettle, combustion reacting with oxygen or air jetted from gas pipeline of reactive kettle, dropping ferric oxide particles into liquid settling medium, separating them out by settling liquid, receiving reactant, drying and cooling to obtain final product. It has better tinting strength and dispersion and can be used for building material, coating, ink, ceramic and papermaking.

The invention relates to a preparation method of porous metallic oxide stacked by nano-particles. The preparation method comprises the following steps: mixing a cationic surface active agent, a metal salt, hydroxycarboxylic acid and a precipitating agent for reaction, and recovering an intermediate product; and roasting the intermediate product to obtain the porous metallic oxide stacked by the nano-particles. By adopting the preparation method provided by the invention, the aim of quickly preparing the porous metallic oxide stacked by the nano-particles is achieved by adding hydroxycarboxylic acid into an aqueous solution of the cationic surface active agent to react with a metallic matrix. By adding the hydroxycarboxylic acid, the size of first-grade nano-particles is controlled, the assembly of nano-particles is assisted to form second-grade micron particles, and rich mesopores are constructed. By introducing the mesopores, the characteristic of a high specific surface of a nano material is kept, the problem that the nano material is difficult to filter and recover is solved, and three processes of preparation, assembly and pore forming of the nano-particles are realized in one kettle. The preparation method disclosed by the invention is simple in process, and water is adopted as a solvent, so that the preparation method is environment-friendly and the cost is greatly reduced.

The present invention relates to a metal oxalate hydrate body having a certain shape, a preparation method thereof, and a metal oxide/carbon composite body prepared by using the metal oxalate hydrate body. In the present invention, the metal oxalate body, whose shape is diversely controlled, and the metal oxide/carbon composite body therefrom are provided.

Disclosed is a microorganism that belongs to the genus Leptothrix and is capable of producing iron oxide that has a ferrihydrite or lepidocrocite structure and has a form of aggregates of ferrihydrite nanoparticles or lepidocrocite nanoparticles; a bacterium that is capable of producing an iron oxide that has a ferrihydrite or lepidocrocite structure and has a form of aggregates of ferrihydrite nanoparticles or lepidocrocite nanoparticles; a culture medium for use in screening a bacterium that is capable of producing a metal oxide; a method for screening a bacterium that is capable of producing a metal oxide; a culture medium for culturing a bacterium that is capable of producing a metal oxide; a method for culturing a bacterium that is capable of producing a metal oxide; a method for producing a metal oxide; and iron oxide.

A method of producing calcium chloride including first forming a slurry of solid calcium oxide in an aqueous solution of calcium chloride, and then contacting the slurry with hydrochloric acid to convert at least a portion of the calcium oxide into calcium chloride.

The invention belongs to the technical field of waste polyester regeneration, and particularly relates to a method for preparing colored polyester in a chain decomposing mode through waste polyester.The method for preparing colored polyester in the chain decomposing mode through waste polyester includes the following steps that (1) the recovered waste polyester is subjected to pre-processing andmatching color matching; (2) a chain decomposing reaction is carried out under the action of a chain decomposing catalyst, so a chain decomposing process is that the temperature of a mother liquor is190-210 DEG C, the reaction time is 30minutes-5 hours, a chain decomposing solution is subjected to precipitation, impurity removal and multi-stage filtration treatment, the filtration fineness is sequentially improved, the fineness of the primary filtration is 50-100 mesh, and finally the filtration fineness is 500-800 mesh; and (3) a chain-decomposed matter after impurity removal is sent to a polycondensation kettle for pre-polycondensation through complementary color, and finally a finished product is formed through final polycondensation. The method can prepare continuous, stable and high-quality colored recycled polyester, and high-value recycling of the waste polyester is realized. The method can prepare continuous, stable and high-quality colored recycled polyester, and realize high-value recycling of waste polyester.

An aspect of the present invention relates to a method of manufacturing a hexagonal ferrite magnetic powder comprising preparing a melt by melting a starting material mixture, wherein the starting material mixture comprises at least one hexagonal ferrite-forming component and glass-forming component comprising at least one B₂O₃ component and a content of the B₂O₃ component in the mixture ranges from 15 to 27 mole percent in terms of B₂O₃; rapidly cooling the melt to obtain a solid having a saturation magnetization level of equal to or lower than 0.6 A·m²/kg; and heating the solid to a temperature range of 600 to 690° C. and maintaining the solid within the temperature range to precipitate a hexagonal ferrite magnetic powder having an average plate diameter ranging from 15 to 25 nm.

The present invention relates to an amine functionalized mesoporous iron oxyhydroxide and a method for fabricating the same, wherein the amine functionalized mesoporous iron oxyhydroxide is provided with amino group with high reactivity with anion heavy metal on the FeOx surface with large special area, thereby effectively removing the anion heavy metal in water. The method for fabricating mesoporous FeOx structure with amino group according to one embodiment of the invention is characterized by comprising the following steps: a first step, mixing water solution of ferric chloride (FeCl12) and surfactant; a second step, mixing peroxide in the water solution of water solution of ferric chloride and surfactant; a third step, after performing centrifugal separation on the mixture solution of the second step, drying the solid matter for fabricating powder-shaped mesoporous FeOx structure; and a fourth step, after dispersing the mesoporous FeOx structure into anhydrous toluene, injecting aminosilane for causing reaction between the aminosilane and the mesoporous FeOx structure, thereby generating amino groups on the surface of the mesoporous FeOx structure.

The invention involves the formation of a sulfided stable iron (II) compound from an iron (II) oxide and/or hydroxide and where the molar ratio of sulfur to iron (II) is greater than 1. Preferably these oxides and/or hydroxides are present as nanoparticles in the 5-10 nanometer range. It has been discovered that such particles can be formed at lower cost and with fewer impurities by using ferrous carbonate (FeCO₃) from siderite as compared to known processes from various iron salts such as sulfates and chlorides.

The invention discloses a system and a method for recycling iron and zinc from hot galvanizing waste acid, and belongs to an industrial waste resourceful treatment technology. The system comprises: awaste acid storage tank, a bubbling type iron removal device, a first plate-and-frame filter press, a zinc precipitation device, a calcium hydroxide preparation tank, a second plate-and-frame filter press and a calcium chloride solution storage tank, the bubbling type iron removal device is respectively connected with the waste acid storage tank, the first plate-and-frame filter press and the calcium hydroxide preparation tank; and the zinc precipitation device is respectively connected with the first plate-and-frame filter press, the second plate-and-frame filter press and the calcium hydroxide preparation tank. The waste acid storage tank, the bubbling type iron removal device, the first plate-and-frame filter press, the zinc precipitation device, the calcium hydroxide preparation tank,the second plate-and-frame filter press and the calcium chloride solution storage tank are arranged, iron and zinc in the hot galvanizing waste acid are separated and recycled through the processes ofreaction, filter pressing and the like on the hot galvanizing waste acid, therefore considerable economic benefits are achieved, and the system and method have positive environmental protection significance.

Pyrophoric material such as iron sulfide is frequently found in refinery equipment. When the equipment is opened to the atmosphere for maintenance, an exothermic reaction can take place that may cause injury to personnel and catastrophic damage to equipment. A process used to treat pyrophoric material uses sodium nitrite injected into a gaseous carrier stream to oxidize iron sulfides to elemental sulfur and iron oxides. The sodium nitrite solution may be buffered to a pH of about 9 with disodium phosphate or monosodium phosphate. A chemical additive that provides a quantitative measure of reaction completion may be added to the treatment solution.

A method for the processing of potassium containing materials comprises:

• • (i) Separation of a potassium containing mineral from gangue minerals;
  • (ii) Acid leaching whereby substantially all potassium, iron, aluminium and magnesium is solubilised and mixed potassium/iron double salt formed;
  • (iii) Selectively crystallising the mixed potassium/iron double salt formed in the leach step (ii);
  • (iv) Second separation to separate the mixed potassium/iron double salt formed in step (iii);
  • (v) Thermal decomposition to produce an iron oxide, a potassium salt and one or more phosphates;
  • (vi) Leaching the product of the thermal decomposition;
  • (vii) Third separation to separate the iron oxide and phosphate from the potassium salt;
  • (viii) Recovering the potassium salt by crystallisation;
  • (ix) Separating the iron oxide and phosphate of step (vii) by leaching and subsequent solid liquid separation; and
  • (x) Precipitating phosphate from liquor produced in step (ix) through the addition of a base.

The invention provides a method for preparing iron oxide yellow from rare earth waste acid leaching residues. The method comprises the following steps: (1) adding a sulfuric acid solution into the rare earth waste acid leaching residues, leaching and filtering to obtain a leachate; (2) adding a reducing agent into the leachate to obtain a ferrous sulfate solution; (3) adjusting the pH value of the ferrous sulfate solution in the step (2) to 3-4 by using a carbonate solution, removing impurities, and filtering to obtain a pure ferrous sulfate solution; and (4) introducing oxygen into the pure ferrous sulfate solution obtained in the step (3). The innovation point of the method is that sulfuric acid generated in the reaction can be consumed by scrap iron, so that sulfuric acid is not wasted, and new ferrous sulfate can be formed. The method is a low-cost, green and sustainable method.

A hydrogen gas production method includes a light irradiation step of applying light to a surface of a metal material immersed in water to produce gas containing hydrogen. In this hydrogen gas production method, the metal material contains iron, in the spectrum of the light, a wavelength at which the intensity is maximum is not less than 360 nm and less than 620 nm, and as the gas is produced, at least one of iron oxide and iron hydroxide is formed on the surface.

The invention relates to an MOFs derivative double-layer coated manganese ferrite wave-absorbing material as well as a preparation method and application thereof. The double-layer coated manganese ferrite wave-absorbing material provided by the invention takes manganese ferrite as a core, the middle is ferrous oxide or cobalt oxide, and the outer layer is carbon. The double-layer core-shell structure of the wave-absorbing material improves interface polarization and dipole polarization, increases the complex dielectric constant of the material, enhances the interface scattering of the multilevel structure, and optimizes the impedance matching of the composite material. According to the embodiment 1, the minimum RL value of the obtained double-layer coated manganese ferrite wave-absorbing material at the frequency of 11.6 GHz is-71.65 dB, and the minimum RL value of the manganese ferrite wave-absorbing material without double-layer coating at the frequency of 13.22 GHz is-37.53 dB. Therefore, the MOFs derivative double-layer coated manganese ferrite wave-absorbing material prepared by the method can effectively absorb electromagnetic waves at a low thickness, and has good chemical stability.

The invention relates to a method for preparing active iron oxide powder materials by means of vacuum aluminothermic reduction. Iron sesquioxide micro-powder is used as a raw material, aluminum micro-powder is used as a reducing agent, and the iron oxide powder materials can be manufactured by the aid of a vacuum aluminothermic reduction process. The method includes preparing steps of 1, uniformly mixing the iron sesquioxide micro-powder, namely, the raw material, and the aluminum micro-powder, namely, the reducing agent, with each other to obtain mixtures for standby application; 2, placing the mixtures obtained in the step 1 in the center of a clean porcelain boat; 3, placing the porcelain boat prepared in the step 2 in the middle of a high-temperature tube furnace, sealing the tube furnace, pumping the high-temperature tube furnace by the aid of a vacuum pump to enable the high-temperature tube furnace to be in an internal negative-pressure state and keeping the vacuum degree of the high-temperature tube furnace lower than or equal to 5pa; 4, heating the high-temperature tube furnace until the temperature of the high-temperature tube furnace reaches 900-1000 DEG C, keeping the raw material and the reducing agent reacting to each other for certain reaction time, then stopping heating the high-temperature tube furnace, cooling the high-temperature tube furnace until the temperature of the high-temperature tube furnace reaches the room temperature and taking products out of the high-temperature tube furnace. The method has the advantages that technologies are simple and controllable, prepared active iron oxide (FeO/Fe<3>O<4>, FeO, Fe/FeO) powder is high in purity and low in cost, and requirements of actual production can be met.