Quality indicators of blending coal

The G, x, and y values of blended coal indicate its caking property; in China, the caking index G value and the maximum thickness of the gum layer y value are commonly used to assess the caking property of blended coal. Expansive pressure is a characteristic of coking coal with adhesiveness; non-coking coal does not have expansive pressure. Expansive pressure can cause colloids to be evenly distributed among coal particles, thereby aiding in the bonding of the coal material. In China, the Y value of the blended coal used in top-mounted coke ovens is generally between 16 and 20 mm, while the bonding index G value ranges from 58 to 72. The y-value and G-value of the blending coal can be calculated based on additivity or determined directly. The expansion pressure of the blended coal cannot be calculated by adding the expansion pressures of the individual coals; it can only be determined through experiments.

Using the G, X, and Y values of the blending coal, it is also possible to predict coke strength, providing guidance for coal blending in coke production.

The y-value of the blend coal used in rammed coke ovens is generally between 14 and 16 mm, while the bonding index G-value is around 70. The y-value and G-value of the blending coal can be calculated based on additivity or determined directly. However, it still depends on the quality of the coke actually produced; it’s not possible to make generalizations.

The y-value of the blend coal used in rammed coke ovens is generally between 9 and 14 mm, while the bonding index G-value is around 52% or higher. The volatile matter content is greater than 22%; the Y value, G value, and volatile matter of the blended coal can be calculated using additive principles or can be determined directly.

How to predict it? Is there any way?