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Method for measuring cerium content in cerium-iron alloy

A determination method and ferroalloy technology, which are applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc. The effect of short operation process

Inactive Publication Date: 2015-07-15
INNER MONGOLIA BAOTOU STEEL UNION
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Problems solved by technology

Cerium is a modifier in steel, and its modification effect is very strong. Therefore, it is meaningful to increase the content of cerium in the alloy to improve the modification effect of the alloy. However, there is currently no standard method for the determination of cerium content in cerium-iron alloys.

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Embodiment Construction

[0024] The above-mentioned and other technical features and advantages of the present invention will be described in more detail below in conjunction with the embodiments.

[0025] 1. Method summary:

[0026] The sample was decomposed with phosphoric acid, and perchloric acid was added to oxidize trivalent cerium to tetravalent cerium. At 5% acidity, use o-phenanthroline and phenylated anthranilic acid as indicators, and titrate with ferrous iron. Get the content of cerium.

[0027] 2: Reagents:

[0028] 2.1: Phosphoric acid (85.11%)

[0029] 2.2: Perchloric acid (70%)

[0030] 2.3: Sulfuric acid (5%)

[0031] 2.4: Urea (20%)

[0032] 2.5: Nitric Acid (50%)

[0033] 2.6: O-phenanthroline indicator (0.5%): Weigh 0.5 g of o-phenanthroline and dissolve it in 100 mL of ferrous ammonium sulfate standard solution with a concentration of 0.00581 mol / L.

[0034] 2.7: sodium arsenite sodium nitrite C (1 / 2Na 3 AsO 3 )+C(1 / 2NaNO3)=0.02mol / L

[0035] 2.8: Ferrous ammonium sulfa...

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Abstract

The invention discloses a method for measuring the cerium content in cerium-iron alloy, and aims to provide a method, which has the advantages of short procedure, low cost, quickness, efficiency, accuracy, and good stability and is easy to master, for measuring the cerium content in the cerium-iron alloy. The method comprises the following steps: dissolving a sample with a mass (m) into phosphoric acid; adding perchloric acid to oxidize the sample, keeping on heating until the perchloric acid is totally evaporated; stopping heating, cooling to a temperature of 40 to 50 DEG C, adding diluted sulfuric acid, water-cooling to the room temperature; adding a urea water solution, adding a sodium arsenite-sodium nitrite standard solution at the same time; adding a drop of phenanthroline indicator and a drop of N-phenylanthranilic acid indicator, titrating by using a ammonium ferrous sulfate standard solution until the solution turns from purple to orange-red; and calculating the cerium content according to a formula WCe=C*MCe*V*100% / m*1000, wherein the C represents the concentration of the ammonium ferrous sulfate standard solution, the measurement unit is mol / L; V represents the volume of ammonium ferrous sulfate standard solution consumed in titration, the measurement unit is mL; MCe represents the mole weight of cerium, the measurement unit is g / mol; and m represents the mass of the sample, and the measurement unit is g.

Description

technical field [0001] The invention relates to the technical field of rare earth iron alloys, in particular to a method for measuring cerium content in ferrocerium 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 technology, an...

Claims

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Application Information

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IPC IPC(8): G01N21/79
Inventor 李虹刘建华周春玲陈英李秀芳
Owner INNER MONGOLIA BAOTOU STEEL UNION
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