Method for determining content of metallic magnesium in briquetting nodulizer through subtraction process

Abstract

The invention discloses a method for determining the content of metallic magnesium in a briquetting nodulizer through a subtraction process. The method comprises the following steps: dissolving metallic magnesium in a sample by dilute acetic acid, filtering, washing, drying a insoluble substance, and weighing; transferring a certain volume of a filtrate, completely reducing ferric iron to divalent iron by titanium trichloride with sodium tungstate as an indicator until tungsten blue is generated, oxidizing the above excess reducing agent by a dilute potassium dichromate solution, tiltrating divalent iron by a potassium dichromate standard solution in a sulfuric acid-phosphoric acid medium with sodium diphenylamine-sulfonate as an indicator, and calculating the mass fraction of iron in the filtrate; and subtracting the mass fraction of iron in the filtrate from the mass fraction reduced to the dissolving by the dilute acetic acid in the sample. The method has the advantages of simplicity, rapidness, high accuracy, high precision and the like, and fully meets the requirements of metallurgical furnace laboratory analysis.

Description

technical field [0001] The invention relates to a method for chemically analyzing metallurgical raw materials, in particular to a method for measuring the content of metal magnesium in a low-silicon briquetting nodulizer. Background technique [0002] The low-silicon briquette spheroidizer is composed of magnesium powder, iron powder and the designed silicon content, and then directly pressed under high pressure to form, which contains 5% ~ 15% Mg, ≤ 5% C, ≤ 20% Si, and can also be Rare earth, carburizer and other components that are beneficial to graphite spheroidization are added as needed. After the metal magnesium in the nodulizer enters the molten iron, it first acts as a desulfurizer and deoxidizer. When the sulfur in the molten iron drops to a certain value, the magnesium starts to nodularize the graphite, making the graphite grow into a spherical shape. Therefore, fully understanding the content of metal magnesium in the low-silicon briquette spheroidizer ensures th...

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Problems solved by technology

If a large number of samples are completely dissolved, a large amount of strong acid is required to dissolve completely, but a large amount of carbon in the sample is difficult to be destroyed, floating in the test solution, and needs to be filtered, and there are a lot of iron ions in the solution, which will affect the metal. The complexometric titration of magnesium results in long analysis time, complex analysis steps, and the general level of repeatability is about 3%. In order to meet the requirements of fast and accurate analysis of samples on site, it is necessary to invent a low-silicon briquette spheroidizer The method of metal magnesium content in

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