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Carbon and sulfur analysis instrument testing process (1)
Release time: 2019-12-04 11:44:51 Click: 830
Carbon and sulfur are the elements that many manufacturers need to analyze and detect. Its content is closely related to the characteristics of steel. There are many methods for detecting carbon and sulfur in steel. Here are two of them. There are about three articles for inventory. All carbon and sulfur detection methods.
To measure the amount of carbon and sulfur in steel, the first step is to burn the sample in a high temperature furnace (such as a resistance furnace, high frequency furnace, electric arc furnace) to generate and produce sulfur dioxide and carbon dioxide gas. Determine the gas content and convert it into steel. Carbon and sulfur content. The following introduces several carbon and sulfur measurement and analysis instruments with different conversion methods and principles. Some have been phased out and currently use high frequency infrared carbon and sulfur analyzers.
Commonly used high-frequency infrared carbon and sulfur analyzer
Gravimetric determination of carbon and sulfur
In the above-mentioned principle, the sample and the test object are burned, the carbon is oxidized to carbon dioxide, the mixed gas is desulfurized, and the carbon dioxide is absorbed with alkali asbestos, and the carbon content is obtained from the increase.
，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 sulfur is absorbed by alkaline asbestos, it can also be measured. It can be decomposed and oxidized with acid to transform into sulfate. Then, barium chloride is added to the hydrochloric acid medium to generate barium sulfate . After passing through precipitation, filtering, washing, weighing, and finally calculating Content.
It can be seen from the above operations that the two elements need to be measured separately, and the steps are very many. This results in a slow analysis speed, which has the advantage of higher accuracy.
Gas volume method
The isobaric gas volume method for carbon determination (absolute value can be measured) has been recommended as a standard method at home and abroad. The sample was placed in a tube furnace, heated and burned with oxygen, and carbon was oxidized to carbon dioxide. After removing sulfur dioxide, the mixed gas was collected in a gas measuring tube, and its volume was measured. 溶液吸收二氧化碳，再测量剩余气体的体积。 Carbon dioxide was then absorbed with a potassium hydroxide solution, and the volume of the remaining gas was measured. The difference between the volume of the gas before and after absorption is the volume of carbon dioxide, from which the carbon content is calculated .
Carbon and sulfur analyzer steps
This method is accurate, but it is slow, manual operation, and tedious 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, Chinese analysts have proposed "differential pressure" gas legal carbon, studied the theory of differential pressure and fixed carbon, established the differential pressure and fixed carbon equation, developed the differential pressure and fixed carbon instrument, and formulated the differential pressure. The process of carbon determination can complete the carbon content analysis within 60s , with high accuracy, and comprehensively improve the carbon measurement by gas capacity 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, which will be mentioned in the next two articles.