Correct use of carbon* analyzers

At present, the commonly used high-speed carbon and sulfur analyzers in China are roughly divided into three series: simple type, common type, and improved type. Simple type uses the one-chip computer control analysis procedure to carry on the automatic carbon measurement, the sulfur manual titration control, the carbon-sulfur content separately passes through the volume rule cylinder according to the consumption carbon dioxide and the sulfur titration fluid volume computation reads out. Ordinary type On the basis of simple type, the carbon and sulfur content is directly read out through the nixie tube display, and the printer can also print out the test results; it can also automatically complete the titration of sulfur.

Hot metal may not be uniform in the pouring production process. The necessary measures should be taken to adapt the sampling method to the needs of a particular production process. For example, the molten iron in the mixing furnace has delamination, and the sampling must ensure that the analysis can represent the entire melt. For this batch production, two or more samples should be taken from the smelting. It is best to sample nearly one-third and two-thirds of the smelters, measure them, and average them. For continuous production, sampling should be maintained at regular intervals. Sampling method Generally, after the molten iron in the sampling spoon is rapidly poured, the sample is cooled as quickly as possible to obtain white-iron structure and prevent graphitization. The white-iron structure obtained by quench casting from infrared carbon-sulfur analyzers is generally used for physical analysis methods. Non-rapidly cooled samples can also be used. In this case, the sample is taken from a special as-cast state in the sampling spoon or from a sample bar or sample ingot for mechanical performance tests. The sample bar or sample ingot is used to produce the casting or The castings were cast in the same metal.

Since the combustion oxidant for combustion is oxygen, the oxygen quality must be guaranteed. In particular, it cannot contain CO2, and it cannot have more moisture, otherwise the combustion may not be complete, which will affect the test results. Oxygen purification is usually required. Generally use sodium lime and anhydrous calcium chloride, can also be mixed with quicklime and sodium hydroxide and put into the purification tube.

There are more ashes after burning, and they need to be cleaned regularly. The place to clean up is mainly furnaces and dust removal bins. Furnace cleaning: After opening the sill, brush carefully around the quartz tube with a fine brush, taking care not to damage the quartz tube, resulting in poor combustion. Clean the dust bin: Unscrew the bin, brush the dust core with a soft brush wheel, brush the dust, and be careful not to brush the dust paper so as not to affect the dust removal. Flowmeters that cause excessive dust into the furnace affect the analysis.

The analysis principle of high-speed carbon-sulfur analyzer is statutory carbon and iodine titration statutory sulfur for gas capacity. It is generally used in conjunction with electric arc furnaces. It is divided into various models according to the additional functions and degree of automation of the products. The products are converted from manual operation and data conversion to data. Automatic transmission and computer terminal display have been serialized. The advantage is that the price is moderate, convenient and economic, and the disadvantage is that the analysis accuracy is lower. Various types of SMEs can choose different models according to their own needs.