Recovery and Separation of Vanadium, Nickel, and Molybdenum from the Industrial Waste of a Petroleum Refinery by a Complexation Method

Abstract

Based on the characteristics of complexation reactions, a novel method for the recovery and separation of vanadium (V), molybdenum (Mo), and nickel (Ni) is proposed. This approach mainly utilizes oxalic acid and hexamethylenetetramine (HMT) as complexing agents to recover and separate V, Mo, and Ni from the roasting slag of the byproduct carbon black from petroleum refineries, which includes the above elements plus iron and calcium. According to the differences in the solubilities of the metallic oxalic acid complexes, V and Mo were selectively leached with efficiencies of 95.49% and 97.74%, respectively, while Ni, iron, and calcium remained in the residue. After decomplexing the V and Mo complexes in the leachate by adding sulfuric acid, the oxalic acid was recycled. Then, the solution containing V and Mo was treated with HMT, and 93.19% of the Mo was complexed and precipitated. Finally, the precipitated Mo complex was dissociated by the addition of calcium oxide to separate and recover Mo and HMT with a Mo recovery efficiency of 95.72%, and HMT was regenerated and used in the following cycles. As a result, the method proposed in this study is an efficient and sustainable way to recover and separate V, Mo, and Ni from the industrial waste of petroleum refineries.

Highly Selective Separation of Cs+ from Brines Using an Electroactive Layered Composite of Vanadosilicate

“…This value is also obviously lower than the vanadium concentration (0.923 mg L –1 ) in some natural brines . In addition, trace amounts of vanadium ions in the desorption solution can be removed by ion-exchange resins or selective extractants, thereby avoiding pollution of water sources. − Additionally, there is no obvious change in the CV curves after 100 electrochemical redox processes, as shown in Figure c. These results can provide evidence that the vanadosilicate electrode has good stability during the electrochemical process.…”

Transforming Mining Waste to Wealth: A Novel Process for the Sustainable Recovery and Utilization of Iron Tailings through HCl Leaching and MOFs Absorption

“…In the acid-leaching stage, iron tailings are subjected to a controlled acidic environment to selectively dissolve and extract valuable elements. This step is crucial for enhancing the efficiency of subsequent recovery processes [26]. Following acid leaching, chemical precipitation is employed to isolate specific elements and promote the formation of targeted compounds.…”

Tuning the Nucleation Rates for High-Efficiency Hydrolysis of Sodium Vanadate Solution

“…To date, many methods have been worldwide researched on vanadium enrichment and separation in leaching solutions, such as chemical precipitation, ion exchange, solvent extraction, and electrolysis. − However, the methods that can be used for large-scale industrial production involve mainly chemical precipitation, which can be further divided into hydrolysis precipitation, ammonium salt precipitation, calcium salt precipitation, and iron salt precipitation. − The advantages and disadvantages of the vanadium precipitation methods are presented in Table .…”