SU134055A1 - Method for determination of manganese metal in slags and sinter - Google Patents

Description

Methods are known for the determination of metallurgical manganese in welding slags.

The described method differs in that it is simple and allows you to COMPLETELY determine metallic manganese in Plenak of any origin, as well as in agglomerate, regardless of the content of other elements in it.

The method for determining metallic manganese is described as follows. In etakan with a capacity of 500 ml, a slag sample of 0.5 g is prevented and 200 ml of a 2.5% aqueous solution of copper sulphate are added thereto. The solution is boiled for 5-10 minutes. At this time, manganese goes into solution, displacing metallic copper into the sediment. The undissolved residue of the slag and copper is filtered and washed on the filter with hot water. To the resulting filtrate was added 5 ml of sulfuric acid (1: 1) and precipitated the remaining copper in the solution with aluminum foil. Copper is deposited by heating the solution to a boil. When the solution becomes colorless, excess aluminum and precipitated copper are filtered off. The precipitate is washed with hot water, the filtrate is cooled and transferred to a 250 ml volumetric flask. Water is poured into the flask up to the mark and the solution is stirred.

To determine the manganese, 25 ml of the solution is withdrawn into a 250 ml conical flask. 25 ml of water, 20 liters of sulfuric acid (1: 1), W ml of phosphoric acid (sp. Number 1.7) and 10 ml of a 1.5% solution of silver nitrate (AgNO) are poured into the flask. The resulting solution is heated. 20-25 ml of a 20% ammonium lersulfate solution (NH4) aS2O8 are poured into the hot solution and the solution is heated to a boil. Boiling is performed for 4-6 minutes until ammonium persulfate is destroyed, after which the solution is cooled in running water and titrated with 0.1N. solution

No. 134055-2 of Mohr's salt to a slightly pink color, 3-4 drops of a 0.2% solution of phenanthranilic acid are poured in and continue to filter until the solution turns from |) yellow-pink to a light green color. The content of manganese is calculated by the formula:

 Mn where

T-titer of Mohr's salt solution, expressed in grams of manganese (1 ml

0.1 n. Mohr's salt solution corresponds to 0.0010988 g of manganese); And - the number of ml of salt solution Mora, spent on titration; H - 1/10 of the slag sample in

Subject invention

The method of determining metallic manganese in slags and agglomerate, characterized in that, in order to accelerate and simplify the process, the analysis for the extraction of manganese is carried out using boiling 2.5% -Hy copper sulfate solution with precipitation of excess copper with aluminum foil and titration of the analyzed element with a solution of Mohr's salt in the presence of phenanthranilic acid.

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