Selective dissolution of vanadium(V) from spent petroleum catalysts by oxalic acid solution

Abstract

The spent petroleum catalyst contains a significant amount of vanadium and its recovery is essential. Oxalic acid has good metal selectivity due to its complex properties. Leaching experiments with oxalic acid were done to investigate the dissolution behavior of vanadium from spent petroleum catalyst by varying leaching conditions, such as temperature, concentration, pulp density, stirring speed and time. Vanadium and molybdenum were selectively dissolved by oxalic acid from the spent catalysts, while the leaching percentage of other metals was very low. However, the leaching percentage of vanadium by oxalic acid was lower than 45% in most of the leaching conditions. Our results provide some basic information on the dissolution of valuable metals from the spent catalyst by using organic acid.

Thermodynamic behavior of dissolved oxygen and hydrogen in pure vanadium

“…Based on Eqs. (3,(6)(7)(8)(9)(10)(11)(12)(13), the Gibbs energy of formation of the oxide VOy (ΔG3) at various oxygen contents and temperatures is calculated and plotted in Fig. 2, and the oxygen potential of the metallic oxide and V-O solid solution are shown in Fig.…”

“…Vanadium is widely distributed in the crust with a total content of 160 ppm [1] and is generally associated with other metal elements in the ore [2][3][4]. As a valuable metal, vanadium and its compounds are widely used in the steel, chemical, vanadium battery, aerospace, and nuclear power industries because of their excellent material performance [5][6][7][8][9]. At present, metal vanadium or V-bearing alloy was prepared using aluminum with an aluminothermic reduction process at high temperature due to its high melting point, which necessitates a significant amount of energy for the heating and holding process [1,[10][11][12][13][14].…”

Research on Leaching of V and Ni in Spent FCC Catalyst Using Oxalic Acid/H2O2 under Microwave-Assisted Conditions

“…The contents within the dotted line in Figure 1 are the ones that are discussed in the current work. The samples were crushed, screened, and ground to D50 (median diameter) of less than 17.40 µm [22], which not only avoids any impact on the particle diameter of the leaching, but also facilitates the subsequent use of leaching residue.…”

Leaching of Rare Metals from Spent Petroleum Catalysts by Organic Acid Solution

“…To verify this, the chemical composition of these materials was determined by XRF spectrometer. The chemical properties of the spent petroleum catalysts were investigated in our earlier study 15) . The difference in the chemical composition of the spent catalysts before and after calcination can be ascribed to the loss of sulfur content from the spent catalyst.…”

“…In order to find the most suitable kinetic model for the dissolution of vanadium with oxalic acid solution, the above kinetic equations were tested in the present study. The rate equations in Table 3 were tried as a function of time according to our previous experimental data 15) . Among the kinetic equations employed in this work, Eq.…”