45results about "Rare earth metal sulfates" patented technology

There is provided an oxygen storage / release material using a rare earth oxysulfate or oxysulfide, which has a high oxygen storage / release capacity even at lower temperatures. The oxygen storage / release material of the present invention comprises a compound consisting of Pr2O2SO4 and / or Pr2O2S in which at least a part of Pr is replaced with Ce.

The invention discloses a reaction device and a method for preparing a superfine rare earth compound through the same. The reaction device comprises an end cover (1), at least two feeding pipes (2), a cylinder (3), a discharging port (4) and nozzles (5); the feeding pipes stretch into the cylinder (3), and the nozzles (5) are installed at the tail ends of outlets of all the feeding pipes (2); one end of the cylinder (3) is connected with the end cover (1), the other end of the cylinder (3) is connected with the discharging port (4), and the cylinder (3) is in sealed connection with the end cover (1) and the discharging port (4). According to the method, rare earth feed liquid and a precipitator are pumped into the reaction device through the different feeding pipes (2) respectively to react quickly, and the superfine rare earth compound is obtained. The reaction device is small and simple in structure, convenient to make and use, quite suitable for fluid mixing, dispersion, precipitation reactions and other tests or production and easy to clean, and can be used independently or in a combined mode.

The invention discloses an oxygen-containing lanthanum sulfate thin film and a preparation method thereof by layer-by-layer self assembly of nanosheets, and belongs to the technical field of materialscience. The oxygen-containing lanthanum sulfate thin film is made of (La, Eu)2O2SO4, and is 5-50nm in thickness. The preparation method of the thin film by layer-by-layer self assembly of the nanosheets comprises the following steps: mixing lanthanum nitrate solution and europium nitrate solution, adding and dissolving ammonium sulfate particles, then adding ammonia water, regulating pH to 6-10,reacting the obtained uniform suspension for 1-48 hours at the temperature of minus 4 to 4 DEG C, thus obtaining a product, separating and drying, and then adding absolute ethyl alcohol, thus obtaining nanosheet sol; adopting a spin-coating technology to spin-coat the nanosheet sol on a sapphire substrate subjected to infiltrating pretreatment, and by layer-by-layer spin-coating self assembly, obtaining a (La, Eu)2(OH)4SO4.nH2O precursor thin film; drying and calcining to obtain the (La, Eu)2O2SO4 thin film. The oxygen-containing lanthanum sulfate thin film and the preparation method disclosedby the invention have the advantages that the thickness of the oxygen-containing lanthanum sulfate thin film can be controlled by controlling the thickness of the precursor thin film; the film formation is convenient, and the film formation quality is high.

The invention relates to a method for treating rare-earth-containing low-grade fluorite minerals, and belongs to the field of hydrometallurgy. The rare-earth-containing low-grade fluorite minerals areused as a target, and provides a method for performing program temperature control segmented slurry decomposition treatment by adopting an absolute excess sulfuric acid solution, a low-temperature section is controlled to preferentially decompose the fluorite minerals, then raising the temperature to decompose the rare earth minerals. The hydrofluoric acid is recycled from tail gas, the reacted acid leaching slag is leached with water to obtain the rare earth, neutralization and thorium removal are carried out to recover the rare earth and the gypsum which is reach the radioactive standard, and the acid leaching solution is used for circularly decomposing the new fluorite minerals after supplementing sulfuric acid. According to the method for treating rare-earth-containing low-grade fluorite minerals, CaF2 and fluorine-carbon cerium ore in the rare-earth-containing low-grade fluorite minerals reach a relatively high decomposition rate through the program temperature control slurryingreaction, the consumption of sulfuric acid is low, the purity of the hydrofluoric acid recovered from the tail gas is high, hydrofluoric acid, gypsum and a sulfuric acid rare-earth solution are obtained, the comprehensively utilize of fluorine, calcium and rare earth resources in the rare-earth-containing low-grade fluorite minerals is realized, The whole process has no three-waste pollution and is clean and environment-friendly.

Provided is a method for obtaining high-purity scandium oxide efficiently from a solution containing scandium. The method for producing high-purity scandium oxide of the present invention has a first firing step S12 for subjecting a solution containing scandium to oxalation treatment using oxalic acid and firing the obtained crystals of scandium oxalate at a temperature of 400 to 600° C., inclusive, a dissolution step S13 for dissolving the scandium compound obtained by firing in one or more solutions selected from hydrochloric acid and nitric acid to obtain a solution, a reprecipitation step S14 for subjecting the solution to oxalation treatment using oxalic acid and generating a reprecipitate of scandium oxalate, and a second firing step S15 for firing the reprecipitate of obtained scandium oxalate to obtain scandium oxide.

The invention provides a method for recovering scandium from an acidic solution containing scandium. The method having [a] a precipitation step wherein sodium sulfate is added into the acidic solution containing scandium to obtain a precipitate of a scandium double sulfate; [b] a neutralization step wherein pure water is added to the precipitate of a scandium double sulfate to dissolve the precipitate of a scandium double sulfate therein, and scandium hydroxide is obtained by adding a neutralizing agent into the dissolution liquid; and [c] a re-dissolution step wherein an acid is added to the scandium hydroxide obtained in the neutralization step, so that a scandium dissolution after purification, in which the scandium hydroxide is dissolved, is obtained.

The disclosure discloses cerium sulfate chelated sulfur dioxide, a preparation method and a use thereof. The cerium sulfate chelated sulfur dioxide has a molecular formula of Ce[SO4][SO2].2H2O. It is a white crystal and the preparation method thereof may comprise the following steps: adding anhydrous cerium sulfate to dilute sulfuric acid with stirring for dissolvation; adding a solvent followed by refluxing at 45-50° C. for 2.0-2.5 h; heating the reaction product to remove the solvent, cooling to 20° C. or lower, and adding dilute sulfuric acid to allow precipitation of all crystals; cooling down the product followed by suction filtration, washing the obtained crystals by the solvent, so that crude cerium sulfate chelated sulfur dioxide can be obtained. The solubility of the cerium sulfate chelated sulfur dioxide of the disclosure has been significantly improved compared to the anhydrous cerium sulfate. The obtained solution is colorless and transparent, so that the cerium sulfate chelated sulfur dioxide can be used as a better titrant with wide application and supreme performance.

The invention discloses a rear-earth salt sulfate with good water solubility prepared through rear-earth salt sulfate. The rear-earth salt sulfate is characterized in that the rear-earth salt sulfate is powder-like odorless crystals in appearance, the chemical formula is RE2(SO4)3.nH2O, the rear-earth salt sulfate is dissolved in water and acid, the solution is clear, the solubility in water is decreased along with the increase of temperature, and the solubility in a sulfuric acid solution is decreased along with the increase of temperature. The preparation method comprises the following steps: adding rear-earth salt sulfate to the sulfuric acid solution for acid solubility, filtering and removing impurities, crystallization, rinsing and dehydration, and baking. The rear-earth salt sulfate is simple in technological process, low in acid soluble acidity, less in spent acid, less in equipment corrosion, free of environmental pollution, high in product yield and low in cost; the prepared rear-earth salt sulfate is good in water solubility.