| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a simple wet process for treating ash produced from the combustion of petroleum fuel and containing ammonium sulfate and vanadium, especially an industrially advantageous process when the amount of the ash is relatively small, and capable of facilitating a vanadium recovery. SOLUTION: There is provided a process comprising a step of preparing a slurry of ash formed from the combustion of a petroleum fuel, a metal oxidation step of preparing a slurry containing ammonium metavanadate, a liquid/ solid separation step of removing the solids from the slurry containing ammonium metavanadate, a step of adding a magnesium compound to the ammonium aqueous solution recovered from the solid/liquid separation step to effect the double decomposition of the ammonium sulfate, and a step of recovering ammonia from the solution recovered from the double decomposition step, wherein the metal oxidation step is performed under conditions in which the ammonium sulfate concentration of the aqueous solution is 20-45 wt.%, and the temperature is 50 deg.C or below, and the solid/liquid separation step is performed under conditions in which a specified solid/liquid separator is used, and the temperature of the slurry is 40 deg.C or below.</p> |
