US 11,945,728 B2
Process for obtaining vanadium oxide from a gasifier slag field
Sateesh Daggupati, Khamman (IN); Sachchit Majhi, Jamshedpur (IN); Sukumar Mandal, Faridabad (IN); Asit Kumar Das, Jamnagar (IN); Vipulkumar Rameshbhai Panchotia, Morbi (IN); Mehul Bharatbhai Joshi, Bhavnagar (IN); Gopal Ravichandran, Jamnagar (IN); Praveen Kumar Chinthala, Jamnagar (IN); Swapan Kumar Ghosh, Navi Mumbai (IN); and Ajit Vishwanath Sapre, Tampa, FL (US)
Assigned to Reliance Industries Limited, Mumbai (IN)
Appl. No. 17/044,727
Filed by Reliance Industries Limited, Mumbai (IN)
PCT Filed Apr. 3, 2019, PCT No. PCT/IB2019/052718
§ 371(c)(1), (2) Date Oct. 1, 2020,
PCT Pub. No. WO2019/193510, PCT Pub. Date Oct. 10, 2019.
Claims priority of application No. 201821012666 (IN), filed on Apr. 3, 2018.
Prior Publication US 2021/0017038 A1, Jan. 21, 2021
Int. Cl. C01G 31/02 (2006.01); C22B 1/02 (2006.01); C22B 1/14 (2006.01); C22B 3/04 (2006.01); C22B 3/22 (2006.01); C22B 3/44 (2006.01); C22B 7/00 (2006.01)
CPC C01G 31/02 (2013.01) [C22B 1/02 (2013.01); C22B 1/14 (2013.01); C22B 3/04 (2013.01); C22B 3/22 (2013.01); C22B 3/44 (2013.01); C22B 7/007 (2013.01)] 16 Claims
OG exemplary drawing
 
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 %.