Abstract
This paper was to develop an efficient process for efficient recovery and separation of vanadium and chromium. The vanadium-chromium reducing residue was conducted by oxidation acidic leaching with MnO2, followed by selective adsorption of vanadium and precipitation of chromium, respectively. The results showed that 97.93% vanadium was leached out and then adsorbed by melamine at pH 1.8 at 90 °C for 60 min. Almost all chromium was leached out and efficiently recovered as Cr2O3. The leaching process was mainly controlled by surface chemical reaction, and its kinetic behaviors fitted well with the shrink core model. The apparent activation energy for vanadium and chromium leaching out wascalculated as 19.93 kJ·mol−1 and 21.26 kJ·mol−1, respectively.
Highlights
Vanadium(V) and chromium (Cr) are key resources that have been widely used during the manufacturing of petrochemicals, catalysts, ferrous and non-ferrous alloys, and stainless steel [1,2,3,4].Due to the similar chemical and physical properties, vanadium and chromium commonly co-exist in minerals
To satisfy the discharge standard, Na2 SO3 or iron scurf is added to reduce and precipitate Cr(III), V(IV), and V(III), with the solid named as vanadium–chromium reducing residue (VCRR)
For simultaneous vanadium and chromium recovery, a new process of using sodium carbon-aided oxidation roasting, followed by sulfuric acid leaching was proposed by Yang et al [11]
Summary
Vanadium(V) and chromium (Cr) are key resources that have been widely used during the manufacturing of petrochemicals, catalysts, ferrous and non-ferrous alloys, and stainless steel [1,2,3,4]. For simultaneous vanadium and chromium recovery, a new process of using sodium carbon-aided oxidation roasting, followed by sulfuric acid leaching was proposed by Yang et al [11]. The overall vanadium recovery efficiency was 86.5%, which was lower than most industrial practices, Appl. Wang [18,19,20] introduced MnO2 to oxidize and liquid-to-solid ratio on vanadium and chromium leaching efficiency were investigated. Liquid-to-solid ratio on vanadium and chromium leaching efficiency were investigated. The leaching kinetics, as well as the optimal conditions for vanadium and chromium recovery, were iron and steel mill from Pan Gang Group Co., Ltd., Panzhihua, Sichuan Province, China [8,21,22]. The VCRR was precipitated from wastewater containing vanadium and chromium(III) from an iron and steel mill from.
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