過酸化水素による使用済み脱硫触媒からのレアメタルの抽出

抄録

The extraction of rare metals from spent desulfurization catalyst was carried out by using aqueous hydrogen peroxide solution. The leaching test was done under the following conditions; the range of hydrogen peroxide concentration from 0.5 to 6%, pulp density range 20 to 200g/l, leaching temperature range 20 to 80°C and the range of leaching time from 5 to 60 minutes.
In the leaching with hydrogen peroxide, extraction of molybdenum, vanadium, nickel and cobalt increased with increasing hydrogen peroxide concentration, but, extraction of aluminium was not affected by hydrogen peroxide. For instance, the extraction rates of the components on leaching at pulp density of 20g/l for 60 minutes in the solution of 6% hydrogen peroxide were 98.5% for Mo, 85.3% for V, 95.3% for Ni, 96.7% for Co and 6.7% for Al respectively. Concequently, molybdenum, vanadium, nickel and cobalt were effectively extracted from the spent desulfurization catalyst with aqueous hydrogen peroxide solution.