K. Murase et al., RECOVERY OF VANADIUM, NICKEL AND MAGNESIUM FROM A FLY-ASH OF BITUMEN-IN-WATER EMULSION BY CHLORINATION AND CHEMICAL-TRANSPORT, Journal of alloys and compounds, 264(1-2), 1998, pp. 151-156
Vapor phase extraction of vanadium, nickel and magnesium from a fly as
h of Orimulsion(R), a new fuel, has been investigated using high-tempe
rature chlorination with N-2-Cl-2 or air-Cl-2 mixture. The use of N-2-
Cl-2 gas was suited for a selective chlorination of metal components.
Vanadium and iron were extracted at 400 and 500 degrees C, respectivel
y, as oxychloride or chloride vapors. Mutual separation of nickel and
magnesium components was achieved by (i) a selective chlorination foll
owed by vaporization of NiCl2 in the temperature range 650-700 degrees
C or (ii) a chemical transport reaction mediated by vapor complexes w
ith Al2Cl6(g) along a modified temperature gradient. During the chlori
nation, NOx, NH3, SO3 and H2O gases were generated and chlorination sc
hemes were discussed based on the composition of the exhaust gas. (C)
1998 Elsevier Science S.A.