How Does ECA's Spec Affect the Quality of Cathode Carbon Block?

1.?Ash content

It can be inferred that the ash content of electrically calcined?anthracite should be ≤ 7% to ensure that the ash content of the cathode carbon block is within the specified range .

The ash content of the four grades of cathode carbon blocks is shown in Table

Ash Content of Cathode Carbon Block and Electrically Calcined Anthracite Coal Content%

2. Resistivity

Resistivity is the main indicator for controlling the production of?electrically calcined anthracite coal . For the same coal type , the?resistivity of finely washed coal after calcination is directly proportional to its strength. The higher the resistivity , the higher its strength , while?the lower the resistivity , the lower its strength. When the resistivity of?electrically calcined anthracite coal is less than 450 μ When Ω · m, its?own strength greatly decreases , affecting the strength and erosion?resistance of graphite carbon blocks , which will shorten the service life???of aluminum electrolysis cells . At the same time , the lower the resistivity , the higher the power consumption of the electric calcination furnace;

When the resistivity of electrically calcined anthracite coal is greater?than 750 μ At Ω · m, the conductivity of the graphite cathode carbon?block will decrease , the voltage drop of the electrolytic cell will increase , and the energy consumption of the electrolytic cell will also increase.

Therefore , only the resistivity of electrically calcined anthracite coal is?between 450 and 750 μ Within the range of Ω · m, both strength and????resistivity are the optimal control points for the use of graphite cathode carbon blocks .

This time , the range of resistivity indicators is set as: ECA1 is 450- 600 μ Ω · m is mainly used for GS -5 and GS - 10; ECA2 ranges from?600 to 750 μ Ω · m is mainly used for GS- 1 and GS-3.

3.Real density

The higher the degree of graphitization of the same coal type , the?greater the real density. The real density can to some extent represent the quality of electrically calcined anthracite coal. In addition , the real?density value is determined by its resource characteristics , and the?difference in real density of raw coal in different regions is relatively?large. The true reflection of different anthracite calcination quality should be the difference in true density after calcination and before calcination ,?but this difference cannot be detected in the process of commodity?trading.

According to the requirements for the real density value in the??cathode carbon block product standard and referring to the current?status of domestic anthracite calcination indicators, the real density value is set to be above 1.80 g/cm3 .

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4.?Sulfur?content

Sulfur exists in three forms in coal , namely organic sulfur, pyrite?sulfur (sulfur in the form of pyrite and pyrite) , and sulfate sulfur . The first two?can be burned , commonly referred to as combustible sulfur . The last type of sulfate sulfur is present in ash.

After high-temperature treatment , the sulfur in clean coal is?basically converted into SO2 and evaporated into the atmosphere . The sulfur content in electric calcined coal is very low , and controlling the???sulfur in electric calcined coal is meaningless . To ensure the?environment of electric calcined coal production enterprises and the occupational health of workers, the sulfur in the raw coal used for?electric calcination should be controlled.

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