18results about "Ferrous oxides" patented technology

The present invention provides a method of producing hydrochloric acid, comprising reacting high-temperature gaseous chlorine and water vapour in a carbon-free reverse Deacon reaction (RDR) at a temperature of from about 450 to about 750 °Celsius to produce a mixture of gases comprising hydrogen chloride and oxygen. The chlorine is produced by fusing and electrolysing sodium or magnesium chloride in solid phase. The water vapour comes from thermally decomposing a hydroxide of at least one of calcium, magnesium and iron in the absence of oxygen to produce the water vapour without any admixture of oxygen (e.g., from atmospheric air). The mixture of gases produced by the RDR is immediately contacted with liquid water to dissolve the hydrogen chloride therein, thereby producing hydrochloric acid and a stream of tail gases. Heat is extracted from the hydrochloric acid to maintain its temperature substantially constant until the stream of tail gases is no longer in contact therewith. Thus the chlorine and water vapour are both supplied to the RDR at high purity and require little, if any, preheating. Heat extracted from contacting the mixture of gases with liquid water may be used to keep the RDR within its range of operating temperatures. Oxygen can be separated from the stream of tail gases, and the oxygen-depleted stream can be recycled back to the RDR to give a high percentage conversion of chlorine to hydrogen chloride. The RDR may be uncatalysed and kept within its operating temperature range by radio-frequency volumetric heating in at least one of the IEEE Ku-, K- and Ka-bands. The invention also provides a corresponding apparatus (1h) for producing hydrochloric acid, comprising an electrolytic cell (10) for the electrolysis, a gas-tight kiln (20) for the thermal decomposition, a gas-phase reactor (30) for the RDR, and an absorber (40) for dissolving the hydrogen chloride in the liquid water. The apparatus (1h) may further comprise a separator (80) for separating the stream of tail gases into the oxygen-depleted stream and a stream of oxygen, which may be fed to a steelmaking apparatus (90), for example. The liquid water for dissolving the hydrogen chloride can come from condensing water vapour obtained by drying an aqueous solution of sodium or magnesium chloride or of sodium hydroxide. The apparatus (1h) may therefore also comprise a dryer (60) for drying this aqueous solution, and a condenser (70) for condensing the water vapour thus obtained. Sodium chloride or magnesium chloride in solid phase derived from drying the aqueous solution may be recycled back to the electrolytic cell (10). Electricity for the electrolysis can come from a renewable resource. At least some of the heat for the thermal decomposition may come from the liquid metal which is a co-product of the electrolysis. The invention is therefore highly energy efficient and requires little, if any, extra energy, apart from the electricity required for the electrolysis. The invention also uses commonly available ingredients and produces no greenhouse gases.

A method for extracting an iron oxide composition from a mafic and / or ultramafic rock comprises introducing a mafic and / or ultramafic rock and CO2 to a first reactor, reacting the mafic and / or ultramafic rock and CO2 in the first reactor, thereby yielding a first reactor effluent comprising one or more iron silicate compounds and one or more products of the reaction in the first reactor; separating the first reactor effluent into a first stream comprising the one or more iron silicate compounds and a second stream comprising the one or more reaction products of the first reactor; introducing the first stream and water to a second reactor; and reacting the first stream and water in the second reactor, thereby yielding a second reactor effluent comprising one or more iron oxide compounds, water, and silica.

The application belongs to the technical field of material application, and particularly relates to a graphitized carbon material and a preparation method and application thereof, the preparation method of the graphitized carbon material is as follows: (1) D-(+)-xylose powder and transition metal salt powder are weighed and uniformly ground; (2) after sieving, calcination is carried out under an inert gas atmosphere; (3) after grinding and sieving of the calcined product, washing is carried out with 1.0 mol / L dilute hydrochloric acid solution, then washing is carried out with distilled water and drying is carried out, to obtain the graphitized carbon material, the graphitized carbon material has high adsorption efficiency on aflatoxin B1 (AFB1) in vegetable oil, and in combination with magnetic solid phase extraction (MSPE) and high performance liquid chromatography-fluorescence detection (HPLC-FLD) technology, the detection limit is as low as 2.0 pg·g ‑1 The graphitized carbon material has excellent regeneration performance, and the material consumption and cost in the detection process are significantly reduced.

The invention relates to processes for the removal of iron impurities and optionally other impurities from rare earth metal-containing compositions such as rare earth metal-containing compositions from magnets and ores.

The invention discloses a method for preparing a hard carbon negative electrode material from bagasse. The method comprises the following steps: Fe ion introduction, FeO introduction, starch wrapping and carbonization. FeO is introduced, so that the conductivity of the negative electrode material can be improved, the specific capacity of a product is improved, the energy density of a battery is improved, the particle size of bagasse powder and the particle size of leaf powder are 5-8 times that of the bagasse powder, small-particle-size leaf powder is more favorable for being adsorbed on large-particle-size bagasse powder, and soluble starch is used for wrapping, so that the conductivity of the battery is improved. Cellulose in the material can construct a conductive carbon net, conductivity is improved, volume expansion can be achieved all the time, meanwhile, a hard carbon layer is formed after outer-layer starch is carbonized, the specific surface area of the negative electrode material is reduced, the forming volume of an SEI film is effectively reduced, and improvement of the first-time efficiency is facilitated.

The purpose of the present disclosure is to provide an iron powder for odor elimination and deodorization, the iron powder having an excellent odor elimination and deodorization effect against various substances. An iron powder for odor elimination and deodorization according to one aspect of the present disclosure contains iron as a main component and contains 0.5% by mass or more of oxygen.

The invention discloses an efficient demanganizing agent, a preparation method of the efficient demanganizing agent and a molten steel demanganizing method after converter tapping. The efficient demanganizing agent comprises the following raw material components: CaF2 and FeO / Al2O3 composite particles, wherein the FeO / Al2O3 composite particles comprise a FeO inner core and a nano Al2O3 coating, and the surface of the FeO inner core is coated with the nano Al2O3 coating. According to the method, the efficient demanganizing agent is added after converter tapping, the purpose of deep demanganizing is achieved by increasing the oxidability of the top slag of the molten steel, the low-manganese steel production process is simplified, the purpose of deep demanganizing of the low-manganese steel can be achieved without purchasing low-manganese iron ore, adopting converter duplex or double-slag smelting and demanganizing in modes such as over-blowing, and the method is safe, reliable and low in cost. The production cost of the low-manganese steel can be reduced, and meanwhile furnace lining erosion can be effectively avoided.

The present disclosure provides a method for separating iron element in brine and application thereof. The method for separating iron element in brine comprises: adding a pH adjusting agent to brine, to adjust pH of the brine to 6.0-7.0, and controlling the temperature of the brine to 75° C.-90° C.; introducing an oxygen-containing gas into the brine, to covert the iron element in the brine into magnetic iron oxide; and separating the magnetic iron oxide from the brine by magnetic adsorption to obtain an iron-removed brine.

The invention relates to a hexagonal sheet-shaped Fe3O4 (at) FeO (at) C (at) ZnIn2S4 core-shell structure wave-absorbing material as well as preparation and application thereof, the hexagonal sheet Fe2O3 with the diameter of about 12 microns is taken as a template, and a double-layer core-shell structure with a magnetic core-PDA-derived carbon middle layer-semiconductor shell is constructed through surface coating polydopamine carbonization and in-situ growth of ZnIn2S4 nanosheets. Impedance matching is effectively improved through the hexagonal sheet structure, multiple loss mechanisms such as magnetic loss, interface polarization and dipole polarization are introduced into multiple heavy components, and the electromagnetic wave absorption performance of the material is cooperatively improved. The preparation method is simple, and the product is regular in morphology and excellent in performance and has wide application prospects in the technical fields of electromagnetic protection and stealth.

Provided is a method for producing a highly active oxygen carrier at low cost, and a method for producing hydrogen and an apparatus for producing hydrogen using the highly active oxygen carrier. Solution A method for producing an oxygen carrier of the present invention is a method for producing an oxygen carrier formed of an activated iron titanate containing an alkali titanate and an iron oxide by calcining a mixture of iron titanate particles and an alkali component. The mixture of the iron titanate particles and the alkali component is prepared by any of: physically mixing the iron titanate particles and an alkaline compound; and spraying an aqueous solution of the alkaline compound to the iron titanate particles or impregnating the iron titanate particles with the aqueous solution of the alkaline compound and then drying the sprayed or impregnated iron titanate particles.

The invention belongs to the technical field of metallurgy, and particularly relates to a preparation method of FeO under laboratory conditions. The technical scheme of the invention is as follows: the method comprises the following steps: 1) grinding a certain mass of FeC2O4. 2H2O reagent until the particle size is below 150 meshes, and paving the ground FeC2O4. 2H2O reagent at the bottom of a crucible to obtain a material layer with the thickness of not more than 30mm; 2) determining components of the protective gas; according to the mass of the FeC2O4. 2H2O reagent, the flow of the introduced protective gas is calculated; (3) roasting the crucible, introducing protective gas, raising the temperature to 810 DEG C from room temperature at the temperature raising speed of 10 DEG C / min, and keeping the temperature for 30 minutes; then naturally cooling to room temperature; the obtained roasting product is FeO. According to the method, FeO with relatively high purity can be conveniently prepared under laboratory conditions, FeO raw materials are provided for a FeO-containing slag system, the accuracy of research on the FeO-containing slag system is favorably improved, and the development of a metallurgical technology is promoted.

The present invention provides a method and apparatus (2a) for producing at least one of calcium oxide, magnesium oxide and an iron oxide from an ore comprising a carbonate mineral of at least one of calcium, magnesium and iron, such as limestone and siderite ores. The method comprises producing liquid sodium and chlorine gas by electrolysis. The liquid sodium is oxidised to sodium oxide and the chlorine is used to make hydrochloric acid. The sodium oxide may be produced in a redox reaction with an oxide of another metal to produce the other metal in elemental form as well. The ore is added to the hydrochloric acid to dissolve the carbonate mineral therein, which produces gaseous carbon dioxide and an aqueous solution respectively comprising at least one of calcium chloride, magnesium chloride and ferrous chloride. The carbonate mineral is dissolved in the hydrochloric acid closed off from their surrounding environment and the carbon dioxide is captured. The aqueous solution is reacted with at least some of the sodium oxide, or sodium hydroxide derived therefrom, to produce an aqueous solution of sodium chloride and a precipitate respectively comprising at least one of calcium hydroxide, magnesium hydroxide and ferrous hydroxide. The precipitate is then phase separated from the aqueous solution of sodium chloride and the hydroxide(s) in the separated precipitate are thermally decomposed to produce water vapour and a solid end-product comprising the desired oxide(s). Sufficient heat for this thermal decomposition is transferred to the separated precipitate from at least one of the electrolysis products, the exothermic processes by which the precipitate is produced, their respective products and the products of the thermal decomposition itself. Thus the invention consumes no carbonaceous fuel, including any fossil fuel, and has electricity as its only energy requirement. If the electricity is produced from a source of renewable energy, it produces no greenhouse gas emissions. The apparatus (2a) comprises an electrolytic subassembly (10), a sodium oxide or hydroxide-producing subassembly (13), a hydrochloric acid-producing subassembly (12), a reaction subassembly (14), a solid-aqueous phase separator (16), a kiln (20), and a heat transfer pathway (23) for transferring enough heat to the precipitate in the kiln (20) to cause the thermal decomposition from at least one of: a product of the electrolytic subassembly (10), the other subassemblies (12, 13, 14) and their respective products, and a product of the thermal decomposition. The invention is intended to replace the traditional calcination process, including for the production of cement clinker, and can also be used to convert siderite ores into one or more iron oxides suitable for ironmaking. The captured carbon dioxide may be reacted with a second portion of the sodium oxide, or with sodium hydroxide derived therefrom, to produce sodium carbonate, thereby also providing a replacement for the Solvay process. In some embodiments, the method can even have a negative carbon footprint overall.

An object of the present disclosure is to provide an iron powder for deodorization that has an excellent deodorizing effect on various objects.SOLUTION: An iron powder for deodorization according to one aspect of the present disclosure contains iron as a main component and contains 0.5% by mass or more of oxygen.SELECTED DRAWING: Figure 1

The application provides a method for separating iron elements in brine and application thereof, and the method for separating iron elements in brine comprises the following steps: adding a pH regulator into the brine, adjusting the pH value of the brine to 6.0-7.0, and controlling the temperature of the brine to be 75-90 DEG C; introducing oxygen-containing gas into the brine, so that the iron elements in the brine form magnetic iron oxide; and separating the magnetic iron oxide from the brine by using a magnetic separator to obtain iron-removed brine. The method can convert the iron elements in the brine into magnetic iron oxide, and then remove the iron elements from the brine by using a magnetic separation technology, so that the problem that iron ions in the brine interfere with the adsorption of lithium by an adsorbent is solved, and the iron-removed brine obtained by the method can be directly used for lithium extraction by an adsorption method, which is matched with the existing process conditions for lithium extraction from brine, and has good practicability.

Disclosed herein are acid-base leaching methods and systems. Specifically, the systems and methods can include supplying an iron and / or aluminum feed material and an acid to a first reaction chamber; supplying a first leachate comprising iron and / or aluminum salts or cations from the first reaction chamber and a calcium feed material to a second reaction chamber to form a solid comprising iron and / or aluminum; supplying a second leachate from the second reaction chamber comprising alkaline earth metal salts or cations and a base to a third reaction chamber to form a precipitated alkaline earth metal product.

The present invention is related to effect pigments exhibiting a deep black body color as well as a blue interference color, to a process for the production of such pigments as well as to the use thereof, especially in coating compositions.