Recovery of vanadium from spent catalysts of sulfuric acid plant by using inorganic and organic acids: Laboratory and semi-pilot tests

•Recovery of metals from deactivated catalysts has gained importance.•Reuse of some of the waste would decrease the consumption of primary resources.•Spent catalysts cause environmental risks due to their hazardous content.•Recovering metals from waste would benefit a recycling culture.•Comparison o...

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Bibliographic Details
Published in:Waste management (Elmsford) 2016-03, Vol.49, p.455-461
Main Authors: Erust, Ceren, Akcil, Ata, Bedelova, Zyuldyz, Anarbekov, Kuanysh, Baikonurova, Aliya, Tuncuk, Aysenur
Format: Article
Language:English
Subjects:
Catalysis
Catalysts
Citric acid
Citric Acid - chemistry
Hydrogen peroxide
Industrial Waste - analysis
Leaching
Metal recovery
Oxalic acid
Oxalic Acid - chemistry
Recycling - methods
Spent catalyst
Sulfuric acid
Sulfuric Acids - chemistry
Vanadium
Vanadium - analysis
Waste management
Waste Management - instrumentation
Waste Management - methods
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Summary:•Recovery of metals from deactivated catalysts has gained importance.•Reuse of some of the waste would decrease the consumption of primary resources.•Spent catalysts cause environmental risks due to their hazardous content.•Recovering metals from waste would benefit a recycling culture.•Comparison of different reagents for V recovery with conventional hydroprocesses. Catalysts are used extensively in industry to purify and upgrade various feeds and to improve process efficiency. These catalysts lose their activity with time. Spent catalysts from a sulfuric acid plant (main elemental composition: 5.71% V2O5, 1.89% Al2O3, 1.17% Fe2O3 and 61.04% SiO2; and the rest constituting several other oxides in traces/minute quantities) were used as a secondary source for vanadium recovery. Experimental studies were conducted by using three different leaching systems (citric acid with hydrogen peroxide, oxalic acid with hydrogen peroxide and sulfuric acid with hydrogen peroxide). The effects of leaching time, temperature, concentration of reagents and solid/liquid (S/L) ratio were investigated. Under optimum conditions (1:25 S/L ratio, 0.1M citric acid, 0.1M hydrogen peroxide, 50°C and 120min), 95% V was recovered in the presence of hydrogen peroxide in citric acid leaching.
ISSN:0956-053X
1879-2456
DOI:10.1016/j.wasman.2015.12.002