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What Is The Difference Between Semi-coke And Coke?
- Oct 15, 2018 -

In the process of coal dry distillation, when the temperature of coal is higher than 100, the water in coal evaporates; when the temperature is higher than 200, the bound water in coal is released; when the temperature is higher than 350, the cohesive coal begins to soften, and further forms a viscous colloid (peat, lignite, etc. do not occur this phenomenon); to 400 ~ 500 (?) Gas and tar are separated and weighed as primary pyrolysis products. The pyrolysis proceeds at 450 ~ 550 C, and the residue thickens and solidifies to form semi-coke!!!


When the temperature is higher than 550 C, the semi-coke continues to decompose, and the remaining volatiles (mainly hydrogen) are precipitated. The semi-coke shrinks at the same time to form cracks. When the temperature is higher than 800 C, the volume of semi-coke shrinks and hardens to form porous coke!!!


When the dry distillation is carried out in a chamber retorting furnace, the primary thermal decomposition product contacts the red hot coke and the wall of the high temperature furnace, and the secondary thermal decomposition occurs, forming the secondary thermal decomposition product (coke oven gas and other coking chemicals).


The solid product of low temperature carbonization is a loose black semi coke with low gas yield and high tar yield.


High temperature dry distillation solid products are compact silver gray coke with high gas yield and low tar yield.