T. Yoshimori et al., Metal recovery system from soots produced by the gasification process for heavy oil residue, SEKIYU GAKK, 43(6), 2000, pp. 403-408
Citations number
15
Categorie Soggetti
Geological Petroleum & Minig Engineering
Journal title
SEKIYU GAKKAISHI-JOURNAL OF THE JAPAN PETROLEUM INSTITUTE
Noncatalytic partially combustive gasification to carbon monoxide is one of
an attractive process for the utilization of a heavy petroleum residue. Th
e gasification operates in a reducing atmosphere, so a carbonaceous deposit
(soot) containing iron, vanadium and nickel is produced. The extractive re
covery of vanadium and nickel by nitric acid, sulfuric acid and a mixture o
f sulfuric acid/ammonium sulfate aqueous solution from the soot obtained fr
om a commercial process was carried out to elucidate the effects of extract
ion conditions on the recovery rate of metals. Although 80% of vanadium was
recovered from the soot collected from the gasification plant without pret
reatment, the extraction ratio of nickel was below 20%. The dissolution rat
e of nickel sulfide, which is the main component in soots, is slower than t
hat of nickel oxide. To improve the recovery rate of nickel, the soot was p
artially oxidized in air. The extraction ratio of nickel from the 90% oxidi
zed soot rose to about 80%.
A basic flow sheet for the metal recovery was proposed for a commercial pla
nt based on the extraction results obtained.