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Testing process of carbon and sulfur analysis instruments (1)
Release time: 2019-12-04 11:44:51 Click: 1190
Carbon and sulfur are elements that many manufacturers need to analyze and test. Its content is closely related to the characteristics of steel. There are many ways to detect carbon and iron in steel. Two of them are introduced below. There are about three articles to take inventory. All carbon and sulfur detection methods.
To measure the amount of carbon and sulfur in steel, first of all, the sample is burned in a high-temperature furnace (such as resistance furnace, high-frequency furnace, electric arc furnace) to generate and produce sulfur dioxide and carbon dioxide gas. Carbon and sulfur content. The following introduces several different conversion methods and principles of carbon and sulfur measurement and analysis instruments. Some have been eliminated, and high-frequency infrared carbon and sulfur analyzers are currently used.
Commonly used high-frequency infrared carbon and sulfur analyzer
Gravimetric determination of carbon and sulfur
In the above principle, the sample and the object to be tested are combusted, the carbon is oxidized to carbon dioxide, the mixed gas is desulfurized, the carbon dioxide is absorbed with alkali asbestos, and the carbon content is determined from the increment.
，生成硫酸钡 ，经过，沉淀，过滤洗涤，称量，最后计算得出硫的含量。 After the sulfur is absorbed by the alkali asbestos, it can also be measured. It is decomposed and oxidized with acid to transform into sulfate. Then, barium chloride is added to the hydrochloric acid medium to generate barium sulfate . The content.
It can be seen from the above operation that the two elements have to be measured separately. There are many steps, which results in a slow analysis speed. The advantage is that it has higher accuracy.
Gas volume method
The isobaric gas volume method for measuring carbon (the absolute value can be measured) has been recommended as a standard method at home and abroad. The sample is placed in a tube furnace, heated with oxygen to burn, oxidize carbon to carbon dioxide, remove the sulfur dioxide, collect the mixed gas in the measuring gas tube, and measure its volume. 溶液吸收二氧化碳，再测量剩余气体的体积。 Then use potassium hydroxide solution to absorb carbon dioxide, and then measure the volume of the remaining gas. The difference between the volume of gas before and after absorption is the volume of carbon dioxide, and the carbon content is calculated from this method. The measurement range of this method is 0.05% to 4.0% .
Carbon and sulfur analyzer steps
This method is accurate, but it is slow, manual, and cumbersome and time-consuming. “差压”气体法定碳，研究了压差定碳的理论，建立了压差定碳的方程，研制了差压定碳的仪器，制定了压差定碳的工艺，能在60s 内完成碳量分析，准确度高，全面提升气体容量法碳的测定。 In order to improve the above problems, the analysts in our country put forward the legal carbon of the "differential pressure" gas, studied the theory of differential pressure carbon determination, established the differential pressure carbon determination equation, developed the differential pressure carbon determination instrument, and formulated the differential pressure The carbon determination process can complete the analysis of carbon content within 60s , with high accuracy, and comprehensively improve the measurement of carbon by the gas volume method.
The above are the two detection methods for carbon and sulfur. In addition, there are many methods, including chromatography and spectroscopy, to detect carbon and sulfur. The following two articles will mention it.