74results about "Lithium nitrates" patented technology

The present invention describes a process for converting vapor streams from sources containing at least one nitrogen-containing oxidizing agent therein to a liquid fertilizer composition comprising the steps of: a) directing a vapor stream containing at least one nitrogen-containing oxidizing agent to a first contact zone, b) contacting said vapor stream with water to form nitrogen oxide(s) from said at least one nitrogen-containing oxidizing agent, c) directing said acid(s) as a second stream to a second contact zone, d) exposing said second stream to hydrogen peroxide which is present within said second contact zone in a relative amount of at least 0.1% by weight of said second stream within said second contact zone to convert at least some of any nitrogen oxide species or ions other than in the nitrate form present within said second stream to nitrate ion, e) sampling said stream within said second contact zone to determine the relative amount of hydrogen peroxide within said second contact zone, f) adding hydrogen peroxide to said second contact zone when a level of hydrogen peroxide less than 0.1 % by weight in said second stream is determined by said sampling, g) adding a solution comprising potassium hydroxide to said second stream to maintain a pH between 6.0 and 11.0 within said second stream within said second contact zone to form a solution of potassium nitrate, and h) removing said solution of potassium nitrate from said second contact zone.

The invention discloses a method for preparing lithium salts from lithium extracted from spodumene, which comprises the following steps: a. transforming and roasting; b. cooling and ball milling; c. acidifying and roasting; d. slurrying and neutralizing; e. separating, washing and purifying; f. blending and transforming; g. filtering and washing; h. deep impurity removing; i. neutralizing; j. concentrating and crystallizing; k. cooling to precipitate sodium; l. concentrating and crystallizing; and m. separating and drying. The method disclosed by the invention has the advantages of short technical process, low energy consumption, simple operation steps, low production cost and high resource utilization ratio.

Methods for assembly of monolayers of nanoparticles using the Langmuir-Blodgett technique, as well as monolayers, assemblies, and devices are described. The surface properties of these monolayers are highly reproducible and well-defined as compared to other systems. These monolayers can readily be used for molecular detection in either an air-borne or a solution environment, and sensors using the monolayer could have significant implications in chemical and biological warfare detection, national and global security, as well as in medical detection applications.

A process for the removal of pollutants from a combustion process and, more particularly, a process for removing pollutants such as carbon dioxide, mercury, sulphur dioxide, nitrogen compounds and oxygen compounds from a combustion process. The process includes the removal of pollutants from a combustion process that produces an emission comprising: cooling the emission to a temperature of about 200° C.; removing nitrogen, water and oxygen from the emission to produce a gas containing a concentration of pollutants; contacting the gas with an aqueous magnesium chloride solution, wherein a slurry mixture is formed; and cooling the gas and the slurry mixture, wherein hydrochloric acid vapour and a sludge are formed.

The invention discloses a method for extracting lithium salt from spodumene by a soda ash pressure leach method. The method comprises the following technological process: (1) roasting and transforming; (2) cooling and grinding; (3) size mixing; (4) pressure leaching; and (5) cooling and decompressing. The method is characterized by further comprising the following technological process: (6) pressure filtering and separating; (7) acidifying and transforming; (8) separating and washing; (9) condensing and separating out sodium; (10) evaporating and crystallizing; (11) centrifugal separation; and (12) drying. The method for extracting lithium salt from spodumene by the soda ash pressure leach method provided by the invention is simple in process, low in cost and high in resource utilization rate.

The present invention provides a method for advantageously producing an iron oxyhydroxide exhibiting excellent capability of adsorbing harmful substances, such as a phosphrous components and endocrine disrupting chemicals, which are contained in industrial wastewater, exhaust gases, etc., and an adsorbent material comprising the iron oxyhydroxide produced by the method as a main component. Specifically, the present invention provides an adsorbent material produced by a method comprising the steps of:

• • (a) adding a base to an aqueous iron ion-containing solution, adjusting the pH of the resultant mixture to 9 or less, to form a precipitate that contains an iron oxyhydroxide;
  • (b) drying the precipitate at a temperature of 100° C. or lower to obtain an iron oxyhydroxide;
  • (c) contacting the resultant iron oxyhydroxide with water; and
  • (d) subjecting the resultant iron oxyhydroxide to a heat treatment under a gas atmosphere having an inert gas concentration of 80% or greater at a temperature of 100 to 280° C.

Disclosed is an aqueous solution of a chromium salt, in which the oxalic acid content is 8% by weight or less relative to chromium. In the aqueous solution of the chromium salt, the total organic carbon content is 4% by weight or less relative to chromium. The chromium salt is preferably a chromium chloride, a chromium phosphate, or a chromium nitrate. The chromium chloride preferably contains a basic chromium chloride represented by the composition formula Cr(OH)_xCl_y (wherein 0<x≦2, 1≦y<3, and x+y=3). The chromium phosphate is preferably one represented by the composition formula Cr(H_3−3/nPO₄)_n (wherein n is a number satisfying 2≦n≦3). The chromium nitrate is preferably a basic chromium nitrate represented by the composition formula Cr(OH)_x(NO₃)_y (wherein 0<x≦2, 1≦y<3, and x+y=3).

A process is presented for the production of ammonium sulfate nitrate. The process provides for producing a highly uniform product and having a substantially uniform size. The process includes reacting ammonium sulfate and ammonium nitrate to form an FASN slurry melt. The slurry melt is continuously stirred and heated to keep the slurry melt under a shear thinned condition and at a uniform temperature until the slurry melt is extruded, cooled and solidified.

The present invention provides a process for recovering Li values from a sodium saturated brine. The process includes recovering Li values from a sodium saturated brine which contains LiX. The process includes concentrating the sodium saturated brine to at least 9000 mg/l LiX, passing the concentrated brine through a bed of polycrystalline hydrated alumina pellets until the pellets are loaded with LiX from the concentrated brine, displacing brine held-up in the bed by using concentrated NaX, unloading LiX from the pellets by flowing through the bed an aqueous solution of LiX which is not saturated, displacing the LiX from the bed using concentrated NaX, and repeating the steps at least one additional time to provide the Li values.

The present invention provides a lithium ion battery and positive electrode material thereof. The positive electrode material includes a high nickel material having a chemical formula of LiNi_xM_1-xO₂ and a coating layer, wherein 0.5≤X<1, M is selected from at least one of Co, Mn, Al, Mg, Ti and Zr, a specific surface area of the positive electrode material is 0.2 to 0.6 m²/g, and a residual lithium content on a surface of the positive electrode material is 200 to 1000 ppm. Compared with the prior art, the positive electrode material for lithium ion battery of the present invention is prepared by solid phase reaction, which not only can significantly reduce the residual lithium content on the surface of the positive electrode material, but also can avoid increase of the specific surface area of the positive electrode material for lithium ion battery.

Purification techniques have been developed for ceramic powder precursors, e.g., barium nitrate. These techniques can be performed using one or more of the following operations: (1) removal of impurities by precipitation or coprecipitation and separation using a nonmetallic-ion-containing strong base, e.g., tetraalkylammonium hydroxides; (2) reduction of higher oxidation-state-number oxymetal ions and subsequent precipitation as hydroxides that are separated from the solution; and (3) use of liquid-liquid exchange extraction procedures to separate certain impurities.

Low-cost, high-purity strontium nitrate that is low in Ba, Na, Ca, Cr, and other impurities and that is suitable for use in airbags or the like is provided. High-purity strontium nitrate having a Ba content of 0.01 wt % or lower, an Na content of 0.005 wt % or lower, a Ca content of 0.01 wt % or lower, a Cr content of less than 0.001 wt %, and a purity of 99.5 wt % or higher is produced by a manufacturing method comprising a first step for performing crystallization by adding nitric acid to an aqueous solution obtained by dissolving a strontium compound as a starting material, a second step for separating the resulting crystals, a third step for crystallizing the resulting separated solution, and a fourth step for separating the resulting crystals.

The present invention is compositions and methods for improving seed germination rates or speed using a composition comprising at least one high valency silver ion. The compositions and methods of the present invention are effective in treating biofilms.

The invention discloses a method for lithium salts from high-magnesium lithium-containing brine. The method comprises the following steps: extraction: mixing a tributyl phosphate extraction system with high-magnesium lithium-containing brine and an alkaline solution, and carrying out lithium extraction to obtain a lithium-carried extraction system and an extracted water phase; exchange: mixing a lithium salt water solution with the lithium-carried extraction system to remove impurities in the lithium-carried extraction system, thereby obtaining a high-purity-lithium-carried extraction system and an exchanged water phase: and back extraction: carrying out back extraction on the high-purity-lithium-carried extraction system with an acid solution to obtain a lithium-salt-containing water phase, and drying the water phase by distillation to obtain the lithium salts. The alkaline solution can be mixed with the extraction phase in the back extraction step and the extracted water phase in the extraction step, and the obtained regenerated extraction system can be recycled. The alkali solution is added in the extraction technique, thereby solving the problem of uncontrollable extraction process and unstable regeneration of the extraction system in the prior art.

A process for producing potassium nitrate and other metal nitrates from the chlorides, sulfates, oxides of these metals. The process uses nitrogen dioxide as a true fluidizing medium in shallow beds of the aforementioned solids at moderately elevated temperatures in a continuous counter current process to convert the metal chlorides, sulfates, and oxides, into metal nitrates and effluent gas and water vapor. The process may be carried out in a series of true fluidized beds arranged in a vertical configuration so that the solids flow downward due to the fluidized process and the nitrogen dioxide gas flows counter currently in an upward direction producing pure metal nitrates at the bottom and nitrosyl chloride gas and/or water vapor at the top.

The invention discloses a preparation method of a graphene oxide nano roll and a composite material thereof, which belong to the field of preparation of carbon nano materials. According to the invention, the defects of complex process, low efficiency, high energy consumption, complex process, single product and the like of the existing preparation method of the carbon nano roll and the composite material are overcome. The method comprises the following steps: ultrasonically dispersing graphene oxide sponge prepared by adopting a liquid phase stripping method and freeze-drying in deionized water; dissolving graphene oxide in water, dropwise adding to a clean substrate, horizontally placing in equipment connected with a vacuum pump, and vacuumizing at normal temperature to quickly evaporatewater, thereby obtaining the graphene oxide nano roll; and obtaining a one-dimensional or three-dimensional network structure by controlling the concentration of the graphene oxide; preparing the GO-carbon tube nanoscroll or the GO-carbon tube-metal salt nanoscroll composite material by selectively adding acidified carbon nanotubes and various metal salts. The method is low in cost, easy to operate, high in safety and convenient for large-scale preparation, popularization and application of various products.

An anion conductive material consists of a low-regularity layered double hydroxide having ion conductivity enhanced by delamination of a layer structure of a regular layered double hydroxide.

A process in which a basic metal nitrate is obtained in a high yield is provided. A process for producing a basic metal nitrate, which comprises adding an aqueous solution of a metal nitrate or an aqueous solution of a mixture of a metal nitrate and a water-soluble additive and an alkali solution to a reaction vessel in which a reaction solvent whose pH at 20° C. is adjusted to 6 or less is present, and conducting the reaction with stirring.

A method of preparing a hafnium nitrate thin film includes placing phosphorus pentoxide in a first vessel; connecting the first vessel to a second vessel containing hafnium tetrachloride; cooling the second vessel with liquid nitrogen; dropping fuming nitric acid into the first vessel producing N₂O₅ gas; allowing the N₂O₅ gas to enter the second vessel; heating the first vessel until the reaction is substantially complete; disconnecting the two vessels; removing the second vessel from the liquid nitrogen bath; heating the second vessel; refluxing the contents of the second vessel; drying the compound in the second vessel by dynamic pumping; purifying the compound in the second vessel by sublimation to form Hf(NO₃)₄, and heating the Hf(NO₃)₄ to produce HfO₂ for use in an ALCVD process.

A method of producing anhydrous calcium nitrate, anhydrous magnesium nitrate or mixture thereof involves removing water from a solution of calcium nitrate, magnesium nitrate or mixture thereof in a pulse combustion drier. The invention also provides a mixture of anhydrous calcium nitrate, anhydrous magnesium nitrate and the individual anhydrous nitrate salts in a sealed container.

An apparatus and process for removing acidic gases and NOx from flue gases produced by utility and industrial plants. The process and apparatus convert NOx, and particularly nitric oxide, to nitrogen dioxide, which is then reacted to form a valuable byproduct. The process generally entails contacting a flue gas with a scrubbing medium to absorb acidic gases from flue gas and produce an intermediate flue gas. The intermediate flue gas is then cooled to cause nitric oxide present therein to be oxidized to form nitrogen dioxide, which is then absorbed from the flue gases to produce a nitrogen dioxide-containing solution and a scrubbed flue gas. The nitrogen dioxide in the nitrogen dioxide-containing solution is then reacted with ammonium hydroxide to form ammonium nitrate as a valuable byproduct.