Coke market report 2012
2013-03-12 17:59:16 【Print】
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1. Attribute, distribution and usage of coke
1.1 Attribute
Coke, which is a solid product after high-temperature retorting of coking coal with carbon as the major ingredient, has flaws and irregular hole structural bodies (porous bodies). The quality of flaws will influence the force and crushing strength of coke, being measured with degree of flaws (the quality of flaws in a unit of coke). The pore rate (the percentage of pore volume accounting for total volume) will be used to measure hole structure, which will affect reactivity and strengthen of coke. Coke for different applications requires different pore rates, and 40-45% of pore rate is required for metallurgical coke, and 35-40% and 30% for foundry coke and export coke. The degree of flaws and pore rate are decided by coal types being coking. Coke being coked by gas coke will be characterized by considerable flaws, high pore rates and low strength, while coke being coked by coking coal has few flaws, low pore rates and high strength. Crushing strength and abrasive resistance are adopted to signify the strength of coke. Crushing strength (M40) indicates that coke can resist external impact but not crush along the structure or flaws, which is affected by the degree of flaw. Abrasive resistance (M10) indicates that the coke can resistance external friction but do not have scrap or powder, which is affected by hole structure. There are many methods to test M40 and M10, and China mainly adopts the method of German Micum.
1.1 Attribute
Coke, which is a solid product after high-temperature retorting of coking coal with carbon as the major ingredient, has flaws and irregular hole structural bodies (porous bodies). The quality of flaws will influence the force and crushing strength of coke, being measured with degree of flaws (the quality of flaws in a unit of coke). The pore rate (the percentage of pore volume accounting for total volume) will be used to measure hole structure, which will affect reactivity and strengthen of coke. Coke for different applications requires different pore rates, and 40-45% of pore rate is required for metallurgical coke, and 35-40% and 30% for foundry coke and export coke. The degree of flaws and pore rate are decided by coal types being coking. Coke being coked by gas coke will be characterized by considerable flaws, high pore rates and low strength, while coke being coked by coking coal has few flaws, low pore rates and high strength. Crushing strength and abrasive resistance are adopted to signify the strength of coke. Crushing strength (M40) indicates that coke can resist external impact but not crush along the structure or flaws, which is affected by the degree of flaw. Abrasive resistance (M10) indicates that the coke can resistance external friction but do not have scrap or powder, which is affected by hole structure. There are many methods to test M40 and M10, and China mainly adopts the method of German Micum.
