Patent ID: 11945728
Assignee: RELIANCE INDUSTRIES LIMITED
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  Y | IPC C

Claim 0:
1. A process for obtaining vanadium oxide from gasifier slag having vanadium component; the process comprising the following steps:
a) pulverizing the gasifier slag to a particle size less than 100 μm to obtain a pulverized slag;
b) blending the pulverized slag with water and at least one alkali salt to obtain a slurry;
c) drying the slurry to remove water therefrom;
d) roasting the dried slurry in the presence of air and at a temperature in the range of 750° C. to 1000° C. to obtain a roasted slag;
e) leaching the roasted slag with water to obtain a first filtrate comprising the vanadium component;
f) separating a silica component from the first filtrate to obtain a second filtrate;
g) reacting the second filtrate with an ammonium salt to obtain ammonium metavanadate, in the form of a precipitate, and a third filtrate; and
h) separating the precipitate of ammonium metavanadate and calcining the precipitate of ammonium metavanadate at a temperature in the range of 400 to 600° C. to obtain vanadium oxide having purity greater than 95 wt %.