Method for measuring lanthanum content in lanthanum-iron alloy

Abstract

The invention discloses a method for measuring the lanthanum content in a lanthanum-iron alloy. The method comprises the following steps: dissolving a lanthanum-iron alloy by nitric acid; diluting the solution by water, boiling the diluted solution; then adding hot oxalic acid, dropwise adding 5 drops of cresol red indicator at the same time, adjusting the pH value by ammonia liquor until the color turns from red to yellow, heating the solution to a temperature of 100 DEG C, maintaining the temperature for 10 minutes; allowing the solution to stand still for two hours, filtering the solution by a quantitative filter paper, fully washing the precipitate by a mixed water solution of oxalic acid and ammonium oxalate, transferring the precipitate to a filter paper, washing the precipitate by a mixed solution of oxalic acid and ammonium oxalate, placing the precipitate into a ceramic crucible, burning the precipitate into ashes; finally burning the ashes in a muffle furnace for 30 to 40 minutes, cooling, and weighing. The lanthanum content can be calculated according to a formula: WLa2O3=m1*100% / m, wherein the m1 represents the mass of rare earth oxides, the measurement unit of m1 is g, m represents the mass of a sample, and the measurement unit is g. The cresol red indicator is a ethanol solution of cresol red. The provided method has the advantages of short course, low cost, rapidness, efficiency, accuracy, and good stability, and can be easily mastered.

Description

technical field [0001] The invention relates to the technical field of rare earth iron alloys, in particular to a method for measuring lanthanum content in lanthanum iron alloys by volumetric method. Background technique [0002] Rare earth is known as the "gold" of industry. Because of its excellent optical, electromagnetic and other physical properties, it can be combined with other materials to form a variety of new materials with different properties. Its most notable function is to greatly improve the quality and performance of other products. For example, the tactical performance of steel, aluminum alloy, magnesium alloy, and titanium alloy used to manufacture tanks, aircraft, and missiles has been greatly improved. Moreover, rare earths are also lubricants for many high-tech industries such as electronics, lasers, nuclear industry, and superconductivity. Once the rare earth technology is used in the military, it will inevitably bring about a leap in military technolo...

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Problems solved by technology

Its new use is to produce hydrogen storage alloys, to manufacture new types of rare-earth nickel-hydride batteries with no pollution and large capacity, and is often used to manufacture expensive camera lenses; Lanthanum 138 is radioactive, with a half-life of 1.1×10 11 In 2010, it was tried to treat cancer, and there is currently a lack of determination methods for the content of lanthanum in lanthanum-iron alloys

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