45results about "Rare earth metal sulfates" patented technology

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.

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 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.