Analysis and Application of Inorganic Carbon and Sulfur Analyzer for Carbon and Sulfur in Ferromanganese

A method for producing medium carbon manganese-iron carbon and sulfur internal standard samples by using carbon ferromanganese in industry. The infrared carbon-sulfur analyzer solves the problem that the non-aqueous titration determines the standard sample and the large consumption of carbon and sulfur. Medium carbon ferromanganese is widely used in the steel industry. It is mainly used as an alloying additive and deoxidizer in the manufacture of welding materials. Carbon and sulfur are the main elements in the acceptance index. The analysis of carbon and sulfur currently uses two methods: high-frequency combustion-infrared absorption and tube furnace combustion-non-aqueous titration. The former has high accuracy, but the analysis cost is also high; the latter is a traditional method that can meet most analytical requirements.

In the non-aqueous titration method, it is necessary to use a standard sample having the same carbon and sulfur content as the sample matrix. However, there are currently few standard samples available on the market, and the sulfur content is generally below 0.005% , which cannot meet the requirements.

In this paper, the medium-carbon ferromolybdenum is used for screening and processing, and the internal standard of carbon-manganese-iron is prepared by using the infrared absorption legal value, which is applied to daily analytical requirements and has achieved satisfactory results. The self-made internal control standard samples are not only moderate in content, easy to calibrate, but also greatly reduce the cost of testing.

Production of internal control standard samples of medium carbon ferromanganese

Test Part 1: major equipment and tools

Standard sample sieve: 80 mesh, 120 mesh

Medium carbon ferromanganese powder: for production

High temperature drying oven: 350 °C

QL-HW2000B infrared carbon and sulfur analyzer: Kirin   QL

1.1 Test Method: production of carbon ferromanganese powder 5kg, first with a standard Sieve particle size selection, and then placed in a drying oven passivation treatment, infrared carbon and sulfur analyzer after setting, packed in wide mouth In the bottle.

2.1 Results and discussion: The choice of the particle sample particles for analysis not too thick, too thin and difficult to guarantee uniformity in the passivation effect. 5 kg of medium-carbon ferromanganese powder was taken and screened by a combination of 80 mesh and 120 mesh standard sieves. The sample was divided into three parts and subjected to passivation treatment. Experiments show that the partial passivation between 80 mesh and 120 mesh has the best effect and good uniformity.

2.2 passivation temperature and time will place a long carbon ferromanganese oxidized from the surface, so that the content of each element is changed. In order to avoid this , the passivated medium carbon ferromanganese should be golden yellow. The amount of sample, passivation temperature and time all affect the passivation effect of the sample. The experiment shows that the sample of 80 mesh to 120 mesh is diluted into 2 mm in a porcelain plate, baked at 300 ° C for 1 hour, and stirred once every 10 minutes to obtain a satisfactory passivation effect. After taking out the cooling, store in a dry jar and set a value.

3. 3 uniformity test and setting

Drawing 3 .3.1 infrared carbon and sulfur analyzer and parameter selection standard curve

Experiments show that, in accordance with the table: Parameters HW2000B infrared carbon and sulfur analyzer set, good melting the sample, the peak shape perfectly. A series of ferromanganese standards (including low-carbon ferromanganese and high-carbon ferromanganese) were selected for the gradient of carbon and sulfur content, and the method was established.

Analysis Parameters of Carbon and Sulfur in Ferromanganese by Infrared Carbon and Sulfur Analyzer

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