Evolution Behaviors Of Pore Structures For Steel Slag Based High Reactive Cokes In Solution Loss Reaction

In this work,The pore structure of BC and BC+1%SS coke high reactive coke was prepared by adding steel slag into industrial blend coal were analyzed by low temperature nitrogen adsorption method after dissolving different proportion of carbon?5%⁵0%?at different temperatures?900¹200??to study the evolution characteristics of pore structure in the process of coke loss reaction.The results show that with the increase of carbon loss ratio,the adsorption capacity of BC and BC+1%SS increases gradually at first and then decreases gradually.The adsorption isotherm changes from I to II,and there is obvious hysteresis loop.The inflection point of the change of adsorption amount appears between 10%²0%of carbon loss ratio,Moreover,The change range of adsorption-desorption isotherm of the latter is larger than that of the former.The specific surface area of BC and BC+1%SS increases first and then decreases with the loss of carbon.The total pore volume of coke increases gradually,while the micropore volume increases first and then decreases.The maximum value appears when x=20%,which is similar to the change trend of specific surface area.The specific surface area increment rate(?S_BET/?x)of highly reactive coke is larger than that of BC,and the pore size distribution is narrower than that of BC;With the loss of carbon,the pore size distribution of BC and BC+1%SS is mainly 2⁴ nm,and the micropore size distribution is mainly less than 1 nm.With the increase of the loss of carbon,the pore size distribution of mesoporous first decreases and then increases,while the pore size distribution of micropore first widens and then narrows.The loss of carbon results in micropore size enlargement,aperture enlargement.From high temperature to low temperature,The specific surface area of the two kinds of cokes showed an increasing trend,which indicated that the internal diffusion degree was small,and the reaction was concentrated on the coke surface,and the specific surface area was small.When the reaction was carried out at low temperature,the internal diffusion degree was large,and the loss reaction could develop to the maximum extent,leading to the specific surface area after the reaction Bigger.However,steel slag increases the active point of loss reaction on coke surface,which changes the loss degradation mode of coke strength,and then affects the evolution behavior of pore structure in the process of coke solution.Figure 29;Table 5;Reference 48...