What does the characteristics of coker residue mean?

I really don’t know; could some expert share it?

Cinder characteristics: Cinder refers to the residue remaining in the crucible after the determination of the ash content; the cinder characteristics (CRC) describe the shape of the material that remains after the thermal decomposition of coal. It is divided into 8 numbers according to different shapes, and these numbers serve as the characteristic codes for the cinder. Coke residue characteristics are obtained simultaneously with the measurement of volatile matter, and they serve as qualitative indicators to determine the degree of coal caking strength; there is generally a direct proportional relationship between them and various caking strength indicators. Features: It is generally believed that types 1 and 2 lack adhesiveness; 1. Powder form. It’s all powder; there are no particles that stick to each other ； 2. Adhesion. With a light touch of the finger, it turns into a powder or is essentially in a powdered state; even larger clumps become powder with just a gentle touch ； 3. Low viscosity. Gently press with your finger to form small pieces ； 4. No melting bonding. It can only be broken into small pieces by applying firm pressure with the fingers; the upper surface of the slag has no luster, while the lower surface has a slight silver-white sheen ； 5. Non-expanding molten bonding. The cinder forms flat lumps, and the boundaries between coal particles are not easily discernible. The upper surface of the cinder has a distinct silver-white metallic luster, while this luster is even more pronounced on the lower surface ； 6. Slightly expanded molten bonding. It cannot be crushed with fingers, and both the upper and lower surfaces of the slag have a silver-white metallic luster. However, the surface of the cinder has smaller expansion bubbles ； 7. Expansion melting bonding. Both the upper and lower surfaces of the cinder have a silvery-white metallic luster; it is significantly expanded, but its height does not exceed 15 mm ； 8. Strongly expanded molten bonding. The upper and lower surfaces of the cinder have a silver-white metallic luster, and the height of the cinder exceeds 15 mm. Features: 1. It is generally believed that grades 1–2 have no adhesiveness, grades 3–4 have weak adhesiveness, while grades 5–8 have strong adhesiveness. However, this method has significant errors, and human factors may affect the results. 2. A coking residue characteristic of not less than 3 is probably the most basic requirement for coking coal, as grades 1 and 2 lack cohesion. The characteristics of coking slag have a certain linear or nonlinear relationship with other parameters such as the cohesion index, but this varies depending on the type of coal. The linear or nonlinear relationship between them can be determined through experiments, allowing for conversion between the two using appropriate formulas. 3. Cokemass characteristics can be applied to coals of various coal grades, but cokemass characteristics are rarely mentioned for anthracites that lack cohesion.

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