Analysis methods of various carbon and sulfur anal

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Talking about the analysis methods of various carbon and sulfur analyzers

there are many kinds of carbon and sulfur analyzers, and the test and analysis principles are different. The scope of application is also different, and the price difference is also great. Now the common analysis and test methods of carbon and sulfur analyzers are summarized as follows:

1. Infrared absorption method (infrared appliance switches the carbon and sulfur analyzer back and forth): the carbon and sulfur in the sample are heated at high temperature under the condition of oxygen enrichment, and oxidized to carbon dioxide Sulfur dioxide gas. After treatment, the gas enters the corresponding absorption pool to absorb the corresponding infrared radiation, which is transmitted by the detector as a signal, and the computer processes and outputs the results. This method has the characteristics of accuracy, speed and high sensitivity. Both high and low carbon and sulfur contents are used. The infrared carbon and sulfur analyzer and the self single arm electronic universal experimental machine using this method are mainly suitable for materials below 5000n to do coherent experiments. The degree of automation is high and the price is relatively high. It is suitable for occasions requiring high analysis accuracy

2. Conductivity method (conductivity carbon sulfur meter): This is a method to measure and analyze the content of carbon and sulfur according to the change of conductivity. The mixed gas produced by the measured sample after high-temperature combustion will change the resistivity (reciprocal of conductivity) after being absorbed by the conductivity cell, so as to measure the content of carbon and sulfur. Its characteristics are accurate, fast and sensitive. It is mostly used for the determination of low carbon and low sulfur

3. Volumetric method (gas capacity carbon sulfur meter): commonly used methods include gas volumetric method for measuring carbon, iodometric method for measuring sulfur, and alkali titration method for 29000 tons of lithium salt output (converted into lithium carbonate equivalent) of Ganfeng lithium industry in 2016. In particular, the gas volumetric method for measuring carbon and iodine is fast and accurate. It is the most commonly used method for the joint determination of carbon and sulfur in China. The accuracy of the carbon sulfur analyzer using this method, with the lower limit of carbon content of 0.050% and the lower limit of sulfur content of 0.005%, can meet the needs of most occasions

4. Titration (titrator): the non-aqueous titrator is used to determine carbon and sulfur elements in steel by acid-base titration. Matching with electric arc combustion furnace, it is suitable for general laboratory, pre furnace test, etc

5. Gravimetric method (carbon sulfur joint tester): commonly used alkali asbestos absorbs carbon dioxide, and the carbon content is calculated from the "increment". Sulfur is usually measured by wet method. The sample is decomposed and oxidized by acid and converted into sulfate. Then barium chloride is added to hydrochloric acid medium to generate barium sulfate. After precipitation, filtration, washing, burning, weighing, the sulfur content is finally calculated. The disadvantage of gravimetric method is that the analysis speed is slow, so it can not be used for on-site carbon and sulfur analysis of enterprises. The advantage is that it has high accuracy. It is still recommended as a standard method at home and abroad, and is suitable for standard laboratories and research institutions

6. Measuring the content of carbon and sulfur in metals, as well as ICP, direct reading spectroscopy, X-ray fluorescence, mass spectrometry, chromatography, activation analysis, etc., each has its own advantages and scope of application

in China, the most widely used are: carbon and sulfur joint tester, infrared carbon and sulfur analyzer, carbon and sulfur analyzer with the best technology of gas introduction, and conductivity carbon and sulfur analyzer

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