Remediation of the vanadium slag processing residue and recovery of the valuable elements
Autor: | Zhuangzhuang Liu, Chengjun Liu, Bo Zhang, Zhanqi Li, Maofa Jiang |
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Rok vydání: | 2019 |
Předmět: |
021110 strategic
defence & security studies Environmental Engineering Materials science General Chemical Engineering Inorganic chemistry 0211 other engineering and technologies Iron oxide Vanadium chemistry.chemical_element Sulfuric acid 02 engineering and technology 010501 environmental sciences 01 natural sciences Chromium chemistry.chemical_compound chemistry Environmental Chemistry Perchloric acid Leaching (metallurgy) Hexavalent chromium Safety Risk Reliability and Quality 0105 earth and related environmental sciences Titanium |
Zdroj: | Process Safety and Environmental Protection. 128:362-371 |
ISSN: | 0957-5820 |
Popis: | The vanadium slag processing residue (VSPR), which is a metallurgical waste produced during the vanadium extraction process from the vanadium titano-magnetite, exhibits potential environmental risk due to the toxicity of chromium in this residue. To remediate the VSPR and recover the valuable elements including iron, chromium, vanadium and titanium, a novel process, i.e., “carbothermic reduction”-“magnetic separation”-“sulfuric acid leaching”-“solvent extraction”, is proposed in this work. The transfer of iron, chromium, vanadium and titanium in the novel process was theoretically and experimentally analyzed. The results demonstrate that the iron oxide can be selectively reduced via the carbothermic reduction. To minimize the loss of chromium, vanadium, and titanium in the magnetic separation, the reduction temperature is suggested to be below 1100 °C to inhibit the reduction of the chromium, vanadium, and titanium oxides in the spinel of (Fe,Mn)x(V,Cr,Ti)3-xO4. Iron was concentrated in the magnetic phase while chromium, vanadium and titanium were concentrated in the non-magnetic phase after carbothermic reduction and magnetic separation. With perchloric acid as oxidizer, the spinel of (Fe,Mn)x(V,Cr,Ti)3-xO4 in the non-magnetic phase was decomposed through sulfuric acid leaching at 160 °C without the generation of hexavalent chromium, and the metal elements were effectively leached. The toxicity test shows that the leaching residue is harmless. Finally, iron, titanium, vanadium, chromium could be preliminarily separated via the solvent extraction by employing D2EHPA as the extraction agent. |
Databáze: | OpenAIRE |
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