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Method for detecting manganese in carbon manganese alloy

A detection method and alloy technology, applied in the preparation of test samples, chemical analysis by titration, etc., can solve the problem that the sample weight cannot guarantee the representativeness of the analysis sample, affect the analysis observation and operation, and the reproducibility of the analysis sample is poor, etc. problem, to achieve the effect of good sample uniformity, easy observation, and accurate judgment of the end point

Active Publication Date: 2013-02-13
TIANJIN IRON & STEEL GRP
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AI Technical Summary

Problems solved by technology

[0003] The analysis of manganese in carbon-manganese alloys generally refers to the analysis method of manganese in ferromanganese, that is, the ammonium nitrate oxidation capacity method for analysis. The general sample size is 0.2 grams. The representativeness of the analyzed samples cannot be guaranteed; at the same time, the presence of free carbon in the samples seriously affects the observation and operation in the analysis
Therefore, this method has poor reproducibility and low accuracy in analyzing samples, which cannot meet the actual needs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Analysis process of manganese in carbon-manganese alloy balls:

[0037] 1. Weigh 3.1106g of the sample in a gray dish with constant weight, burn it at 700--900°C for 2 hours, take it out and cool it to room temperature and weigh it. The weight of the sample after burning is 2.0711g. The percentage A of the sample mass is 66.58%.

[0038] 2. Mix the sample thoroughly after burning, weigh 0.2000g into a 250ml Erlenmeyer flask, add 15ml of phosphoric acid, 5ml of nitric acid (5-10 drops of hydrofluoric acid can be added for insoluble samples), and heat until the sample is completely Dissolve (the solution in the bottle is calm at this time, without bubbles).

[0039] Continue to keep emitting phosphoric acid fumes for 20 seconds, take it off, and place it for 40 seconds, then immediately add 2g of ammonium nitrate, and shake the conical flask fully to completely oxidize the divalent manganese and drive away the yellow nitrogen oxide gas.

[0040] 3. Titration: Let the s...

Embodiment 2

[0046] Analysis process of manganese in carbon-manganese alloy:

[0047] 1. Weigh 5.0919g of the sample in a gray dish with constant weight, burn it at 700--900°C for 2 hours, take it out and cool it to room temperature and weigh it. The weight of the sample after burning is 4.0033g. The percentage A of the sample mass is 78.62%.

[0048] 2. Mix the sample thoroughly after burning, weigh 0.2000g into a 250ml Erlenmeyer flask, add 15ml of phosphoric acid, 5ml of nitric acid (5-10 drops of hydrofluoric acid can be added for insoluble samples), and heat until the sample is completely Dissolve (the solution in the bottle is calm at this time, without bubbles).

[0049] Continue to keep emitting phosphoric acid fumes for 20 seconds, take it off, and place it for 40 seconds, then immediately add 2g of ammonium nitrate, and shake the conical flask fully to completely oxidize the divalent manganese and drive away the yellow nitrogen oxide gas.

[0050] 3. Titration: Let the sample ...

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Abstract

The invention relates to a method for detecting manganese in carbon manganese alloy and belongs to the technical field of elementary analysis. The method for detecting manganese in carbon manganese alloy comprises the following steps: 1) firing a sample: weighting a sample, firing the sample and measuring the mass of the fired sample; 2) dissolving the sample: weighting a right amount of the fired sample, adding in phosphoric acid and hydrogen nitrate, heating till the fired sample completely is dissolved, and then adding ammonium nitrate for fully oxidizing divalent manganese; 3) titration: titrating with ferrous ammonium sulphate solution till the solution becomes light pink, dropping in N-phenylanthranilic acid indicator, and continuing to titrate till the solution becomes bright green; 4) confirming the titer: weighting ferromanganese standard matter, operating according to the same method, and solving the titer of ferrous ammonium sulphate solution to manganese; and 5) calculating the content: the content (%) of manganese = (the titer of ferrous ammonium sulphate solution to manganese) * (the volume of consumed ferrous ammonium sulphate solution) * (the mass percent of the fired sample to the sample) / (sample weight. The method provided by the invention is simple and is convenient to operate and has the advantages of accurate terminal point judgment, good repeatability and the like, and the data is accurate.

Description

technical field [0001] The invention belongs to the technical field of element analysis, in particular to a method for detecting manganese in carbon-manganese alloys. Background technique [0002] At present, carbon-manganese alloy is a new type of composite material, which is generally made into a spherical shape and used in the smelting and alloying process of medium and high carbon steel. The manganese in the carbon-manganese alloy ball plays the role of deoxidation, desulfurization and alloy additive in the steelmaking process. Therefore, the accurate determination of the manganese content in carbon-manganese alloy balls is of great significance to improve the analysis and detection technology, improve product quality, and increase economic benefits. [0003] The analysis of manganese in carbon-manganese alloys generally refers to the analysis method of manganese in ferromanganese, that is, the ammonium nitrate oxidation volumetric method. The representativeness of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N31/16G01N1/28
Inventor 边立槐闫学会孙颖王璐杨觎
Owner TIANJIN IRON & STEEL GRP
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