الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 126 |  |  |
| | | from | 126 | | |
Abstract
A study was made on the recovery of nickel from spent catalyst used in steam reforming of methane to produce hydrogen of Abu-Qir Fertilizers Company. Different methods had been suggested in the literature mostly in patent literature for the recovery of nickel from spent catalysts; however the effect of different variables on nickel recovery is not clear.
In this study, several mineral acids such as dulfuric, hydrochloric and nitric acid were investigated; the effect of acid concentration (10 – 35%), temperature (20 - 100C) and period of digestion (15 – 60 min.) on the recovery of nickel were investigated. Results indicated that the best type of inorganic acids used in nitric acid. Nitric acid of moderate concentration proved to be efficient in leaching nickel from a spent reforming catalyst, it gave a complete recovery of nickel about 99%, and the best condition of recovery was attained by using acid concentration 35% at 100C for one hour.
The second best acid or recovery of nickel was found sulfuric acid. It gave a percentage of recovery 80% of nickel at best condition using acid concentration 25% at 100C for hour.
The third acid for recovery of nickel is hydrochloric acid which gave a low recovery of nickel about 73.4% at acid concentration 30% at 100C for one hour.