Primary coke standard, secondary coke standard.

The industry standards of primary and secondary cokes are shown in the following table.

Note: Moisture is only used as a control technology in production operation, not as a basis for quality assessment.

note:

1. The three-stage cast coke in the table can be divided into three categories: more than 80mm, 80-60mm and more than 60mm (the strength index is greater than 80mm) according to the size of the block.

2. It is stipulated in the table that the lumpiness (mm), ash content (%) and strength (%) are all quality assessment indicators. If one of the above indicators does not reach the specified level, the level (strength indicator) will not be accepted.

Extended data of coke chemical composition

The reactivity of coke and its ability to react chemically with carbon dioxide, oxygen and steam, CRI = (G0- g1)/G0×100% (Note: G0-weight of test coke sample, g; G 1- weight of coke sample after reaction, g; )。

The strength of coke after reaction refers to the ability of coke after reaction to resist crushing and wear under the action of mechanical force and thermal stress. In the process of blast furnace ironmaking, cast iron smelting and fixed bed gasification, coke will react with carbon dioxide, oxygen and water vapor.

Because the reaction of coke with oxygen and water vapor is similar to that of carbon dioxide, most countries use the reaction characteristics of coke with carbon dioxide to evaluate the reactivity of coke.

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