Effective Chromium Extraction from Chromium-containing Vanadium Slag by Sodium Roasting and Water Leaching
スポンサーリンク
概要
- 論文の詳細を見る
Chromium (Cr) was concentrated as chromium spinel in the vanadium slag produced by pre-oxidizing vanadium-containing hot metal in Pan-steel in China. Due to the chromium-rich Hongge ores used, chromium concentration in this slag was much higher than that in common vanadium slags. To propose a process for effective Cr extraction from the slag, mechanisms of Cr oxidation in Pan-steel vanadium slag under sodium roasting conditions were studied experimentally and with thermodynamic simulations. Chromium slags without vanadium were synthesized in the laboratory to mimick mineralogical characteristics of Pan-steel vanadium slag and characterized by XRD, SEM/EDS and TG-DSC techniques. Conditions for Cr extraction from the chromium slag after sodium roasting by leaching with water were studied and optimized. Results showed that Cr spinel was encapsulated in the silicate phase. During sodium roasting, Cr spinel was oxidized and decomposed after oxidation and decomposition of the olivine phase. Sodium carbonate began to react with chromium oxide, which was produced by decomposition of Cr spinel, at 537°C and large amount of sodium chromate appeared after 800°C. However, multi-component liquid phase (mixture of Na2Cr2O4, Na2CrO4 and Na2CO3) was produced after 1000°C, which suppressed the conversion of Cr(III) to Cr(VI) by inhibiting oxygen supply. A conversion about 90% was obtained when the chromium slag was roasted at 1000°C for 2 h with Na2CO3 addition in stoichiometric ratio to total amount of Cr2O3 and SiO2. 96% of Cr in the leaching liquid was recovered as chromium sesquioxide in fine powder form and high purity by reducing and precipitating.
著者
-
XIE Bing
College of Life Science, Northeast Agricultural University, Haerbin 150030, China
-
Li Hong-Yi
College of Materials Science and Engineering, Chongqing University
-
Fang Hai-Xing
College of Materials Science and Engineering, Chongqing University
関連論文
- Effect of Transition Metal Oxides on Radiative Heat Transfer through Mold Flux Film in Continuous Casting of Steel
- Effect of Fluorine on the Minerals Phase and Citric Acid Solubility of CaO-SiO_2-Fe_tO-P_2O_5-CaF_2 System
- Effective Chromium Extraction from Chromium-containing Vanadium Slag by Sodium Roasting and Water Leaching
- Treating Cloned Embryos, but Not Donor Cells, with 5-aza-2-deoxycytidine Enhances the Developmental Competence of Porcine Cloned Embryos
- Recovery of Phosphorus from Dephosphorization Slag Produced by Duplex High Phosphorus Hot Metal Refining
- Effective Chromium Extraction from Chromium-containing Vanadium Slag by Sodium Roasting and Water Leaching
- Theoretical Characterizations of Spinels Containing Iron and Vanadium via ab initio Calculations