112results about "Mangesium aluminates" patented technology

Fused abrasive particles comprising eutectic material comprising Al2O3-MgO-REO eutectic. The fused abrasive particles can be incorporated into abrasive products such as coated abrasives, bonded abrasives, non-woven abrasives, and abrasive brushes.

Fused abrasive particles comprising eutectic material. The fused abrasive particles can be incorporated into abrasive products such as coated abrasives, bonded abrasives, non-woven abrasives, and abrasive brushes.

The present invention is directed to methods for reducing SOx, NOx, and CO emissions from a fluid stream comprising contacting said fluid stream with a compound comprising magnesium and aluminum and having an X-ray diffraction pattern displaying at least a reflection at a two theta peak position at about 43 degrees and about 62 degrees, wherein the ratio of magnesium to aluminum in the compound is from about 1:1 to about 10:1. In one embodiment, the ratio of magnesium to aluminum in the compound is from about 1:1 to about 6:1. In one embodiment, the ratio of magnesium to aluminum in the compound is from about 1.5:1 to about 10:1. In another embodiment, the invention is directed to methods wherein the ratio of magnesium to aluminum in the compound is from about 1.5:1 to about 6:1.

Disclosed herein is a method to produce multiphase composite materials directly from solution precursor droplets by a fast pyrolysis process using a microwave plasma embodiment containing a microwave generating source, a dielectric plasma torch, and a droplet maker. Here, using homogenous solution precursors, droplets are generated with a narrow size distribution, and are injected and introduced into the microwave plasma torch with generally uniform thermal path. The generally uniform thermal path in the torch is achieved by axial injection of droplets into an axisymmetric hot zone with laminar flows. Upon exposing to high temperature within the plasma with controlled residence time, the droplets are pyrolyzed and converted into particles by quenching with a controlled rate of the exhaust gas in a gas chamber. The particles generated have generally uniform sizes and uniform thermal history, and can be used for a variety of applications.

The invention discloses a high-efficiency clean resource utilization method for quadratic aluminum dust. The method comprises the following steps: performing low-temperature roasting treatment on quadratic aluminum dust, removing harmful elements such as nitrogen, carbon and fluorine, pulping, washing, desalting and dehydrating the quadratic aluminum dust, removing sodium salt, potassium salt andother impurity components, washing brine and evaporating and crystallizing by utilizing flue gas waste heat. The purified quadratic aluminum dust can serve as a raw material to be directly utilized, and after the quadratic aluminum dust is mechanically mixed with auxiliary materials (calcium-based, silicon-based and magnesium-based), an aluminum based inorganic material is prepared at a high temperature, and the sintering exhaust gas realizes up-to-standard discharge by virtue of dust removal and dry defluorinated purification. According to the technology in the invention, the quadratic aluminum dust can be safely, cleanly and efficiently treated and converted into the high-value aluminum based inorganic material to the greatest degree, and environmental-friendly treatment and high-value resource utilization of the quadratic aluminum dust can be realized.

The present invention is directed to a process for the preparation of a doped anionic clay. In said process a trivalent metal source is reacted with a divalent metal source, at least one of the metal sources being either doped boehmite, doped MgO or doped brucite, to obtain a doped anionic clay. Suitable dopants are compounds containing elements selected from the group of alkaline earth metals (for instance Ca and Ba), alkaline metals, transition metals (for example Co, Mn, Fe, Ti, Zr, Cu, Ni, Zn, Mo, W, V, Sn), actinides, rare earth metals such as La, Ce, and Nd, noble metals such as Pt and Pd, silicon, gallium, boron, titanium, and phosphorus.

Provided is a method for the formation of particulate compounds of selectable size characteristics, which method includes supporting a slurried particulate precursor on a porous support; heating the support such that aggregates of the particulate compound are formed, and desagglomerating the aggregates into their component particulate. In a preferred embodiment, an aqueous slurry of alumina particulate which has not undergone the alpha transition is contacted with a porous support having defined pore and cavity sizes, such that the slurry occupies at least some of the interstices of the porous support. The slurry and support are heated such that the alumina precursor slurry undergoes the alpha transition. The alpha alumina product is then particulated. The support is of such a material that it is either lost through combustion during heating or otherwise removable after heating, such as during or after particulation, without destroying the particle characteristics imparted by the porous support. Additionally, in a further embodiment, co-components are added to the slurry in order to impart desired properties to the particulated product.

Feed material comprising uniform solution precursor droplets is processed in a uniform melt state using microwave generated plasma. The plasma torch employed is capable of generating laminar gas flows and providing a uniform temperature profile within the plasma. Plasma exhaust products are quenched at high rates to yield amorphous products. Products of this process include spherical, highly porous and amorphous oxide ceramic particles such as magnesia-yttria (MgO—Y₂O₃). The present invention can also be used to produce amorphous non oxide ceramic particles comprised of Boron, Carbon, and Nitrogen which can be subsequently consolidated into super hard materials.

A heat-insulating material is provided in which thermal conductivity is controlled not to increase and good insulation properties are held even in a high temperature range. The heat-insulating material is formed of a spinel porous sintered body having a porosity of 65 to 90 vol. % and represented by a chemical formula XAl₂O₄ (X═Zn, Fe, Mg, Ni, or Mn) which is arranged such that large pores having a diameter of greater than 1000 μm occupy 25 vol. % or less of the total pore volume, fine pores having a diameter of 0.45 μm or less occupy 5 to 40 vol. % of the volume of the pores having a diameter of 1000 μm or less, at least one pore-diameter distribution peak is within a range of 0.14 to 10 μm, and is formed of sintered particles having a calculated average particle diameter of 0.04 to 1 μm.

Process for producing carbon nanospheres and other nano materials with carbon dioxide and magnesium. The carbon dioxide and magnesium are combusted together in a reactor to produce carbon nanospheres and magnesium oxide, which are then separated to provide the individual reaction products. The reaction occurs at a very high temperature, e.g. 2000° F.-5000° F. and also produces large amounts of useful energy in the form of heat and light, including infrared and ultraviolet radiation. Other oxidizing agents such as aluminum can be combined with the magnesium, and the metal oxides produced by the reaction can be recycled to provide additional oxidizing agents for combustion with the carbon dioxide. By varying the reaction temperature, the morphology of the carbon products can be controlled.

Provided is a layered double hydroxide oriented membrane in which layered double hydroxide plate-like particles are highly oriented in the approximately perpendicular direction and which is also suitable for densification. The layered double hydroxide oriented membrane of the present invention is composed of a layered double hydroxide represented by the general formula: M²⁺_1-xM³⁺_x(OH)₂Aⁿ⁻_x/n.mH₂O wherein M²⁺ is a divalent cation, M³⁺ is a trivalent cation, Aⁿ⁻ is an anion having a valency of n, n is an integer of 1 or greater, x is 0.1 to 0.4, and m is 0 or greater, wherein when a surface of the oriented membrane is measured by X-ray diffractometry, a peak of a (003) plane is not substantially detected or is detected to be smaller than a peak of a (012) plane.

The present invention relates to a mayenite-type compound containing Ca, Al and oxygen, wherein part of the Ca atoms are replaced by at least one kind of atoms (M) selected from the group consisting of Be, Mg and Sr. The M/(Ca+M) atomic ratio is 0.01 to 0.50, and at least part of the free oxide ions contained in the mayenite-type crystal structure are replaced with anions of an element having an electron affinity smaller than that of oxygen.

A method of making nanoparticles includes contacting a powder having particles of a first size and an etching material, and heating the powder and the etching material to reduce particles of the first size to nanoparticles having a second size smaller than the first size.

The invention discloses a method for preparing aluminum oxide from aluminum ash in a slag-free manner, which comprises the following steps: proportionally introducing chlorine into aluminum ash, controlling the reaction temperature and time, introducing water vapor after completing primary denitrification, removing residual nitrogen, fluorine and chlorine to obtain impurity-removed aluminum ash and adsorption steam, and condensing the adsorption steam to form an adsorption solution; adding a corresponding amount of lime into the adsorption solution, reacting to obtain a defluorination solution, adding SO2 for neutralization to obtain an ammonium sulfate solution, and concentrating the solution to obtain an ammonium sulfate product; adding alkali liquor at a corresponding proportion to conduct alkali dissolution treatment on the impurity-removed aluminum ash, thus preparing a liquid phase and a slag phase; and additionally mixing a Bayer process solution with an alkali solution, and carrying out seed crystal decomposition and roasting to obtain the aluminum oxide product. According to the method, a two-stage steam impurity removal mode is adopted, so that the removal efficiency of nitrogen in the aluminum ash is greatly improved, fluorine residues are effectively removed, the aluminum ash is subjected to impurity removal through alkali dissolution treatment, corrosion to equipment is small, and implementation is easy.

The invention discloses magnesium aluminum spinel wrapping type gamma-Ce2S3 red pigment. The magnesium aluminum spinel wrapping type gamma-Ce2S3 red pigment comprises a gamma-Ce2S3 color body servingas an inner core as well as a magnesium aluminum spinel shell wrapping the color body inner core. In addition, the invention also discloses a preparation method of the wrapping type gamma-Ce2S3 red pigment. The preparation method comprises the following steps: preparing a CeO2 precursor which is jointly wrapped by aluminum hydroxide and magnesium hydroxide by a liquid phase method and then performing high-temperature vulcanization treatment further through vulcanization atmosphere and inert atmosphere to prepare the magnesium aluminum spinel wrapping type gamma-Ce2S3 red pigment. Through wrapping by the magnesium aluminum spinel, the gamma-Ce2S3 is effectively stabilized, the high-temperature stability of the wrapped and modified pigment is greatly improved and the application field is greatly expanded; furthermore, the process is simple, the reaction is easy to control, the preparation process and the product performance are more stable and reliable, so that industrialized popularization and application are facilitated.

The invention relates to a method used for furnace-free normal-temperature direct sintering preparation of metal composite oxide powder with electric current heat effect. Compared with the prior metalcomposite oxide preparation art, the advantages are that: no expensive high temperature furnace equipment is needed; pre-heating of samples is not needed; preparation of a plurality of metal composite oxides at room temperature can be realized; sintering time is short; efficiency is high; hardware investment is low; energy utilization efficiency is high; suitable application range is wide; technology is simple; energy saving effect is excellent; and cost is low. The method is suitable for large scale preparation of metal composite oxide powder materials, and is promising in application prospect.