Selective leaching of vanadium in calcification-roasted vanadium slag by ammonium carbonate

Li, Hong‐Yi; Wang, Kang; Hua, Wei-Hao; Zhao, Yang; Zhou, Wang; Xie, Bing

doi:10.1016/j.hydromet.2015.11.014

Cited by 134 publications

(30 citation statements)

References 9 publications

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“…During ammonia-ammonium carbonate leaching, Ca 3 (PO 4 ) 2 cannot react with NH 3 (CO 3 ) 2 to produce soluble ammonium phosphate. Due to the fact that the solubility product constant (K sp ) of Ca 3 (PO 4 ) 2 (2.07 × 10 −29 , at 25 • C) is much smaller than K sp of CaCO 3 (2.8 × 10 −9 , at 25 • C) [25]. Therefore, the solubility of P is quite low in ammonia-ammonium carbonate solution.…”

Section: Effect Of the Ammonia To Ammonium Carbonate Concentration Ramentioning

confidence: 99%

Removal of Phosphorus from High-Phosphorus Manganese Ores by Ammonia-Ammonium Carbonate Leaching Method

Liang

Wang

et al. 2019

Metals

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High-phosphorus manganese ores provide an important source of manganese, which is regarded as an irreplaceable material in the steel industry. The ammonia-ammonium carbonate leaching method was proposed for the removal of phosphorus and extracting manganese from high-phosphorus manganese ore, both effectively and environmentally. To explore the dissolution behavior of phosphorus and manganese in the ammonia-ammonium carbonate solution, the effect of the ammonia-to-ammonium carbonate concentration ratio, the leaching temperature, and the liquid-to-solid ratio on manganese extraction and dephosphorization rate were investigated. In addition, the composition of precipitated manganiferous sample, which was obtained from high-phosphorus manganese ores by ammonia-ammonium carbonate leaching process, was also studied. The results indicated that more than 99.2% phosphorus was removed and more than 83.5% of manganese was extracted by ammonia-ammonium carbonate leaching under the following conditions: ammonia to ammonium carbonate concentrations: 14:2 mol/L; liquid/solid ratio: 5:1 mL/g; leaching temperature: 25 °C; The precipitated manganiferous sample has little impurities, Mn% is 44.12%, P% is 0.02%, P/Mn = 0.00045.

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Section: Effect Of the Ammonia To Ammonium Carbonate Concentration Ramentioning

confidence: 99%

Removal of Phosphorus from High-Phosphorus Manganese Ores by Ammonia-Ammonium Carbonate Leaching Method

Liang

Wang

et al. 2019

Metals

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“…About 12–15 wt% of V 2 O 5 and 2–5 wt% of Cr 2 O 3 can be contained in the vanadium slags . The conventional industrial practice for extracting vanadium from vanadium slag involves an oxidation roasting of Na 2 CO 3 –Na 2 SO 4 –NaCl‐added vanadium slag powder in air at about 800 °C followed by a hot water leaching .…”

Section: Introductionmentioning

confidence: 99%

“…The high contents of chromium and vanadium left in the leaching residue posed a big environmental problem unsolved so far in China. In addition, some toxic gases, such as chlorine, hydrogen chloride, and sulfur dioxides, are also produced during the roasting . Thus, a new method is required to solve these problems.…”

Section: Introductionmentioning

confidence: 99%

An Innovative Method to Increase Vanadium Extraction from Vanadium Slag by Increasing the Porosity of Roasted Pellet

Fang

Shen

et al. 2020

steel research int.

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Vanadium extraction from vanadium slag is significantly increased using only NaOH‐added pellet roasting to replace the traditional powder roasting previously. To solve some issues relevant to pellet holes, an innovation process to increase vanadium extraction from vanadium slag by increasing the porosity of roasted pellet is proposed presently. For the pellet added only with Na2CO3 and roasted at 800 °C for 2 h, the melting point of Na2CO3, the pellet porosity, and the vanadium extraction are 851 °C, 6.3%, and 74%, respectively. For the roasted pellet with an optimal NaOH–Na2CO3 additive having a mole ratio of NaOH/(NaOH + Na2CO3) of 0.9, the melting point of additive, the pellet porosity, and the vanadium extraction are 300 °C, 29.6%, and 98.7%, respectively. It is confirmed that the vanadium extraction is proportional to the pellet porosity, maximum of which can be attained by optimizing mole ratio of NaOH to Na2CO3. Both the low melting point and the large alkaline of added NaOH–Na2CO3 mixture are the two possible reasons resulting in the formation of pellet holes.

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“…Many hydrometallurgical processes have been proposed to recover vanadium and chromium 4–9 , but the problems associated with the high temperature salt roasting technologies, including the low overall resource utilization efficiency, the high energy consumption, and the environmental pollution, are still remain unsolved.…”

Section: Introductionmentioning

confidence: 99%

A green method to leach vanadium and chromium from residue using NaOH-H2O2

Peng

Liu

Tao

2018

Sci Rep

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Hydrogen peroxide as an oxidant was applied in leaching of vanadium and chromium in concentrated NaOH solution. Under the optimal reaction conditions (the liquid to solid ratio of 4.0 ml/g, residue particle size of <200 mesh, the mass ratio of NaOH-to-residue of 1.0 g/g, the volume ratio of H2O2-to-residue of 1.2 ml/g, reaction temperature of 90 °C and reaction time of 120 min), the leaching efficiency of vanadium and chromium could reach up to 98.60% and 86.49%, respectively. Compared with the current liquid-phase oxidation technologies, the reaction temperature was 90–310 °C lower, and the NaOH concentration of the reaction medium is lower by more than 50 wt% (the mass ratio of NaOH-to-residue of 1.0 g/g equals to concentration of 20 wt%). The kinetics study revealed that leaching process of chromium and vanadium were interpreted with shrinking core model under chemical reaction control. The apparent activation energy of chromium and vanadium dissolution was 22.19 kJ/mol and 6.95 kJ/mol, respectively.

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Selective leaching of vanadium in calcification-roasted vanadium slag by ammonium carbonate

Cited by 134 publications

References 9 publications

Removal of Phosphorus from High-Phosphorus Manganese Ores by Ammonia-Ammonium Carbonate Leaching Method

Removal of Phosphorus from High-Phosphorus Manganese Ores by Ammonia-Ammonium Carbonate Leaching Method

An Innovative Method to Increase Vanadium Extraction from Vanadium Slag by Increasing the Porosity of Roasted Pellet

A green method to leach vanadium and chromium from residue using NaOH-H2O2

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