Graphite Purity Test

Graphite is an elemental crystalline mineral composed of carbon. It is found naturally in metamorphic rocks and quartz. There are many varieties of graphite, and it can be extracted by various chemical and thermal processes.

Graphite is an important industrial commodity, and has a wide range of applications in various fields. It is an excellent conductor of heat. A variety of graphite products are used in various industries, including vanadium-redox batteries, fuel cells, coatings, roofing, and semiconductors.

Currently, there are four main categories of graphite, based on their carbon content. These are high-carbon graphite, medium-carbon graphite, low-carbon graphite, and amorphous graphite.

The purity of natural flake graphite is an important factor controlling its economic value. In order to prepare graphite for higher purity, the present invention introduces a method. By using alkali acid and complexometry, the impurity can be removed and the graphite can be prepared at high purity.

High-resolution glow discharge mass spectrometry is one method to analyze graphite purity. The process includes applying high temperature to the material, which allows electron energy outside the core to be excited, releasing a spectrum. After the spectrum is analyzed, it can be used to calibrate the elemental content of the graphite.

This technology is particularly useful to test for all elements except for C, H, O, and N. During the test, the graphite sample was placed in a muffle furnace at 900 degC for 5 hours.

Moreover, the ash content of the sample was measured. Although the ash content test is useful as a reference, it is not suitable to calculate the impurity content.

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