By Ramana G. Reddy, Pinakin Chaubal, P. Chris Pistorius, Uday Pal
Read Online or Download Advances in molten slags, fluxes, and salts: proceedings of the 10th international ... conference on molten slags, fluxes, and salts PDF
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Extra info for Advances in molten slags, fluxes, and salts: proceedings of the 10th international ... conference on molten slags, fluxes, and salts
This is possibly due to the fact that some of the carbon and volatile matter in plastic/coke blends had been partially removed during the combustion in the DTF, and thus there was less carbon left in the char to react with liquid slag compared to the case of coke. From this result it could be interpreted that very high and very low rate of gas generation results in a poor foaming behaviour. It can be seen from Figure 4, in the case of 100% coke #3 ( coke in Figure 4), the rate of gas generation was very high which resulted in a fast escaping of gas from the slag droplet and therefore a poor foaming behaviour was observed.
The smaller size of gas bubbles formed in slag #1 could be attributed to its lower surface tension. With increasing the rate of gas generation due to the use of coke-rubber blends as source of carbon in reaction with such slag, the size of generated gas bubbles remained small which 13 implies that the physical property of the slag and its surface tension had a more significant influence on the size of gas bubbles than the rate of gas generation. The higher surface tension of slag #2 resulted in generation of larger gas bubbles which escaped from the slag droplet in a short time after being formed and therefore lead to a poor foaming behavior.
12 In the case of slag #2, when coke-rubber blend was used as carbon resource the rate of gas generation increased compared to slag #1 (Figure 8) and the size of generated gas bubbles were large (Figure 11). However, such large gas bubbles escaped from the slag droplet in a short reaction time which resulted in destabilizing the foamy layer. It can be seen from Figure 10-B the volume of slag droplet soared to a high level in a very short reaction time and then dropped quickly. and (B) slag #2 It is reported in numerous literatures [8,9] that the size of gas bubbles formed during the process of reduction have influence on the stability of foamy layer.