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Download Advances in molten slags, fluxes, and salts: proceedings of by Ramana G. Reddy, Pinakin Chaubal, P. Chris Pistorius, Uday PDF

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By Ramana G. Reddy, Pinakin Chaubal, P. Chris Pistorius, Uday Pal

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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

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02 U/mol],K C 2 s = (5) ICaO 1si02 Expanding the work of Lee et al. [11] , the theoretical liquidus temperatures for anorthiteand melilite-equilibrated liquids are calculated by Eqs. (6) to (9). Together with dicacliumsilicate equilibrated liquids, the relationship between theoretical liquidus temperatures and critical temperatures is expressed in Fig. 7. 0 software. A1 2 0 3 + 2 CaO + Si0 2 = Ca 2 Al 2 Si0 7 (6) a n AG = - 5 0 3 0 5 . 33T [J/mol , K c = Ca2Al2Si07 2 a-cao a-Al2o3 asio2 i C a O + i A l 2 0 3 + Si0 2 = i C a A l 2 S i 2 0 8 AG = - 4 7 9 9 7 .

45 Fig. 3 shows the effect of A1 2 0 3 on the viscosity and structure of the blast furnace slags. As A1 2 0 3 content increases, viscosity increases continuously. Hence A1 2 0 3 behaves as a network former, and consists of A1044" tetrahedral anions. Such an acid behavior of A1 2 0 3 is also shown in FT-IR spectra of Ca0-Si0 2 -Al 2 0 3 -5mass% MgO-5mass% FeO slags in Fig. 3(b). The major FT-IR bands of aluminosilicate structure are asymmetric stretching vibration of 19 A10 4 -tetrahedra (720-630 cm"1), A10 6 -octahedra (570-520 cm"1) and Si-O-Al bending (500 cm _1).

The ash mixed with CaO and C was reduced in a C^ crucible at \113K. The mixed sample melted completely and separated into slag and metal containing vanadium carbide. V was not almost observed in slag phase, and it meant that most of V in ash was recovered as vanadium carbides into the metal phase. The metal was Fe-Ni alloy. In the present work, Fe-Ni-V-C quo-ternary isothermal section phase diagram was experimentally assembled at Y113K. 1mass%C alloy - VsCy mixture from Orinoco tar combustion ash by the reduction with carbonaceous materials were successfully recovered in the present work.

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