Abstract
The vanadium (V) and chromium (VI) was hard to separate directly due to the similar nature. In this paper, separation and recovery of vanadium (V) and chromium (VI) from a leaching solution was investigated by adsorption of vanadium (V) with melamine, followed by electro-reduction of chromium (VI) and adsorption of chromium (III) with melamine, respectively. The effects of experimental parameters including dosage of melamine, reaction temperature and reaction time on the adsorption process were investigated. The results showed that melamine was a good sorbent for adsorption of vanadium (V) and chromium (III). 99.89% of vanadium (V) was adsorbed by melamine at the optimal conditions, the adsorption kinetic was followed the pseudo-second-order model and the adsorption isotherm conformed to the Langmuir model. While the adsorption of chromium (III) was followed the pseudo-first-order model and the adsorption isotherm was conformed to the Freundlich model as the adsorption efficiency was 98.63% under optimal conditions.
Highlights
Vanadium, chromium and their compounds are important national strategy resources and widely used in petrochemical, catalyst, iron steel industries, due to their excellent physicochemical properties[1,2,3,4,5,6]
When the relative pressure (P/P0) was less than or equal to 0.2, the adsorption and desorption curves of melamine were overlapped, which indicated that there were small micro pores existed in the surface of melamine and monolayer adsorption existed in the adsorption performance
The following conclusions could be deduced: (1) Melamine was a good absorbent for adsorption of vanadium and chromium (III)
Summary
Chromium and their compounds are important national strategy resources and widely used in petrochemical, catalyst, iron steel industries, due to their excellent physicochemical properties[1,2,3,4,5,6]. A process consisted of acid leaching, selective oxidation hydrolysis precipitation were investigated to separate and recover chromium from vanadium-chromium bearing reducing slag[24]. Hydrolysis precipitation was used to separate vanadium (V) and chromium (III). Hydrolysis and neutralization were used to separate and recover vanadium and chromium from vanadium (V)-containing chromate (VI) solution[25]. In this process, vanadium was hydrolyzed and the retained vanadium was removed with Fe (II) and Fe (III), the chromium was reduced to chromium (III) and it was precipitated as Cr2O3·xH2O. The process was investigated by adsorption of vanadium (V) with melamine, followed by electro-reduction of chromium (VI).
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