Scholarly record
PRELIMINARY RESULTS OF METAL EXTRACTION FROM SPENT SULFURIC ACID CATALYST BY ACID LEACHING
Abstract
Extraction of vanadium, nickel and iron contained in spent catalyst coming from the manufacture of sulfuric acid (main elemental composition: 3.5\% V; 0.63\% Ni and 7.9\% Fe) was studied. The effects of roasting and leaching temperature, concentration of the leaching reagent, reaction time and pulp density on the extraction of vanadium, nickel and iron were determined. Sulfuric acid was used as leaching reagent. ANOVA was used to find out the optimal leaching conditions and to analyze the results. The results obtained show that nickel extraction yield of 96\% is achieved using 20\% pulp density after roasting at 600ЛљC, followed by leaching at 80ЛљC with 1M sulfuric acid for 30 min reaction time. The highest vanadium extraction yield was 59\% after roasting at 400ЛљC; leaching at 80ЛљC with 0.3M sulfuric acid for 6h and 10\% pulp density. In the same conditions the highest iron extraction yield was 84\%. This percentage of iron extraction yield was also obtained at different condition: roasting at 200ЛљC; again leaching for 6h at 80ЛљC but in this case the concentration of sulfuric acid was 0.6M.
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References16
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