Multistage utilization process for the gradient-recovery of V, Fe, and Ti from vanadium-bearing converter slag

Xiang, Junyi; Huang, Qiao; Lv, Xuewei; Bai, Chenguang

doi:10.1016/j.jhazmat.2017.04.060

Cited by 84 publications

(13 citation statements)

References 22 publications

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“…It suggests that gold remains in cyanide tailings can be captured and enriched in metallic iron if a high-temperature reduction process is conducted. The direct reduction-magnetic separation can effectively recover iron from converter slag [28], vanadium tailings [29], copper slag [30,31], and lead smelting slag [32] to produce iron powders. In this work, direct reduction roasting is applied to produce gold containing iron powders, namely Fe-rich Au-Fe alloy (Fe x Au 1−x ), from cyanide tailings.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Gold and Iron from Cyanide Tailings with a Combined Direct Reduction Roasting and Leaching Process

Feng

et al. 2018

Metals

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Cyanide tailings are the hazardous waste discharged after gold cyanidation leaching. The recovery of gold and iron from cyanide tailings was investigated with a combined direct reduction roasting and leaching process. The effects of reduction temperature, coal dosage and CaO dosage on gold enrichment into Au-Fe alloy (FexAu1−x) were studied in direct reduction roasting. Gold containing iron powders, i.e., Au-Fe alloy, had the gold grade of 8.23 g/t with a recovery of 97.46%. After separating gold and iron in iron powders with sulfuric acid leaching, ferrous sulfate in the leachate was crystallized to prepare FeSO4·7H2O with a yield of 222.42% to cyanide tailings. Gold enriched in acid-leaching residue with gold grade of 216.58 g/t was extracted into pregnant solution. The total gold recovery of the whole process reached as high as 94.23%. The tailings generated in the magnetic separation of roasted products, with a yield of 51.33% to cyanide tailings, had no toxic cyanide any more. The gold enrichment behaviors indicated that higher reduction temperature and larger dosage of coal and CaO could promote the allocation of more gold in iron phase rather than in slag phase. The mechanism for enriching gold from cyanide tailings into iron phase was proposed. This work provided a novel route to simultaneously recover gold and iron from cyanide tailings.

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Section: Introductionmentioning

confidence: 99%

Recovery of Gold and Iron from Cyanide Tailings with a Combined Direct Reduction Roasting and Leaching Process

Feng

et al. 2018

Metals

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“…Iron carbide which can be magnetized in magnetic field [17] is similar to the magnetite and iron power. The magnetic separation was demonstrated to be effective for magnetite and iron power recovery from iron ore and solid wastes [30,31]. For example, magnetite or iron power can be produced from pyrite cinder or low-grade iron ore using magnetizing roasting or direct reduction followed by magnetic separation [1,32].…”

Section: J Min Metall Sect B-metall 54 (2) B (2018) 271 -281mentioning

confidence: 99%

Preparation and recovery of iron carbide from pyrite cinder using carburization-magnetic separation technology

Chen

Gou

et al. 2018

J min metall B Metall

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A new technique with carburization followed by magnetic separation is presented for the preparation of high-grade iron carbide from pyrite cinder to promote the high value-added utilization of pyrite cinder. The effects of carburizing temperature, carburizing time and Na 2 SO 4 dosage on carburized pellets were investigated, and the effects of Na 2 SO 4 dosage and grinding fineness on magnetic concentrate were carried out. The optimized process parameters were proposed as follows: carburizing at 650 °C for 180 minutes in CO-CO 2-H 2 gas mixtures, Na 2 SO 4 dosage of 9%, magnetic field intensity of 130 mT, and grinding fineness of 92.25% powder passing 0.025mm. The iron content, total carbon content, total iron and carbon content of magnetic concentrate were 82.62%, 5.60%, and 88.22%, respectively. The recovery rate of iron reached 88.67%. The behaviors and mechanisms of carburization, separation, and Na 2 SO 4 , were ascertained with optical microscopy, X-ray powder diffraction (XRD), and scanning electron microscope (SEM).

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“…As a result, its consumption and production are increasing rapidly in recent years . Relating to the preparation of some vanadium compounds and the pyrometallurgical extraction process of vanadium, CaO–SiO 2 –VO x is one of the most basic important systems . Hence, the phase equilibria and thermodynamic properties of this system are desirable in controlling the processes …”

Section: Introductionmentioning

confidence: 99%

“…9,10 Relating to the preparation of some vanadium compounds and the pyrometallurgical extraction process of vanadium, CaO-SiO 2 -VO x is one of the most basic important systems. [11][12][13][14] Hence, the phase equilibria and thermodynamic properties of this system are desirable in controlling the processes. 15,16 Since vanadium is a transition element, vanadium oxide has different oxidation states.…”

Section: Introductionmentioning

confidence: 99%

Effects of oxygen partial pressure on the thermodynamics of CaO–SiO₂–VO_x system at 1873 K

et al. 2019

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In this study, two aspects concerning with the thermodynamics of CaO–SiO2–VOx system were investigated. One aspect is about the effects of oxygen partial pressure on the phase relationships in CaO–SiO2–VOx system at 1873 K, and the other is the measurement of the standard Gibbs energy of formation of the vanadium compounds. In the first aspect, the phase relationships in CaO–SiO2–VOx system at 1873 K under oxygen partial pressure of 1.7 × 10−9 atm were determined, and the isothermal section diagram was constructed. Furthermore, by comparing this diagram with that under 6.9 × 10−11 atm, the effects caused by oxygen partial pressure on this system were elucidated. With the increase in oxygen partial pressure, the compound CaV2O4 that exists stably under 6.9 × 10−11 atm is oxidized to V2O3 and CaVO3. The solubility limit of V2O3 in liquid phase also increases remarkably, which results in the enlargement of the single liquid area. In the second aspect, the standard Gibbs energy of formation of CaV2O4, CaVO3, V2O3, and Ca2Si1−δVδO4 (0 < δ < 0.1) at 1873 K were measured. The determined values for CaV2O4 and CaVO3 are −1 259 468.9 ± 5090.5 J/mol and −963 479.8 ± 3298.6 J/mol, respectively. Then, the limit of oxygen partial pressure for CaV2O4 existing stably at 1873 K is determined to be 4.4 × 10−10 atm.

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Multistage utilization process for the gradient-recovery of V, Fe, and Ti from vanadium-bearing converter slag

Cited by 84 publications

References 22 publications

Recovery of Gold and Iron from Cyanide Tailings with a Combined Direct Reduction Roasting and Leaching Process

Recovery of Gold and Iron from Cyanide Tailings with a Combined Direct Reduction Roasting and Leaching Process

Preparation and recovery of iron carbide from pyrite cinder using carburization-magnetic separation technology

Effects of oxygen partial pressure on the thermodynamics of CaO–SiO₂–VO_x system at 1873 K

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Multistage utilization process for the gradient-recovery of V, Fe, and Ti from vanadium-bearing converter slag

Cited by 84 publications

References 22 publications

Recovery of Gold and Iron from Cyanide Tailings with a Combined Direct Reduction Roasting and Leaching Process

Recovery of Gold and Iron from Cyanide Tailings with a Combined Direct Reduction Roasting and Leaching Process

Preparation and recovery of iron carbide from pyrite cinder using carburization-magnetic separation technology

Effects of oxygen partial pressure on the thermodynamics of CaO–SiO2–VOx system at 1873 K

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Effects of oxygen partial pressure on the thermodynamics of CaO–SiO₂–VO_x system at 1873 K