Using of industrial wastes as secondary resources for metals recovery

The increasing demand for metals in the world has required intensive studies for the extraction of metals from low-grade ores and/or secondary resources. The recovery of base metals from industrial wastes by acidic and alkaline leaching yields solutions rich in metals, such as Molybdenum, Cobalt, Nickel and Vanadium in addition to Alumina or Silica, up to the studied material. Extraction of these metals was performed from secondary resources like: spent catalyst from manufacture of sulfuric acid (SSAC), as well as some petrochemical industrial waste matters: spent hydrodesulphurization (HDS) catalyst, LC finer and boiler ash. In the current work are presented in details results regarding Vanadium recovery from SSAC by means of alkaline leaching. Statistical design of experiments and analysis of variance (ANOVA) were performed in order to determine the main effects and interactions of the factors under research, which were temperature of roasting, pulp concentration and concentration of the leaching reagent (NaOH). For optimizing the extraction yield of V, further leaching tests were performed using one-factor at a time method, considering the factors with significant effect.

The increasing demand for metals in the world has required intensive studies for the extraction of metals from low-grade ores and/or secondary resources. The recovery of base metals from industrial wastes by acidic and alkaline leaching yields solutions rich in metals, such as Molybdenum, Cobalt, Nickel and Vanadium in addition to Alumina or Silica, up to the studied material. Extraction of these metals was performed from secondary resources like: spent catalyst from manufacture of sulfuric acid (SSAC), as well as some petrochemical industrial waste matters: spent hydrodesulphurization (HDS) catalyst, LC finer and boiler ash. In the current work are presented in details results regarding Vanadium recovery from SSAC by means of alkaline leaching. Statistical design of experiments and analysis of variance (ANOVA) were performed in order to determine the main effects and interactions of the factors under research, which were temperature of roasting, pulp concentration and concentration of the leaching reagent (NaOH). For optimizing the extraction yield of V, further leaching tests were performed using one-factor at a time method, considering the factors with significant effect. Copyright © 2009, AIDIC Servizi S.r.l.