The limiting effect of manganese phase of oceanic cobalt-rich crust reduction by sawdust in acid leaching

Ju, Jinrong; Feng, Yali; Li, Haoran; Yu, Hao; Wu, Hao; Liu, Shunliang

doi:10.1016/j.scp.2020.100346

Cited by 11 publications

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“…Nevertheless, this method is not suitable for recovering manganese from low‐grade pyrolusite because of its disadvantages such as high energy consumption, poor operating conditions, and serious environmental pollution. The reduction of pyrolusite by some organic materials such as sawdust, cellulose, sugarcane, banyan‐leaves, and tealeaves as reducing agents has been proved to be feasible by some researchers 23–27 . Due to the characteristics of low energy consumption and environmental friendliness, hydrometallurgical reduction leaching is expected to become the mainstream process for manganese extraction from pyrolusite in the future 28,29 .…”

Section: Introductionmentioning

confidence: 99%

“…The reduction of pyrolusite by some organic materials such as sawdust, cellulose, sugarcane, banyan-leaves, and tealeaves as reducing agents has been proved to be feasible by some researchers. [23][24][25][26][27] Due to the characteristics of low energy consumption and environmental friendliness, hydrometallurgical reduction leaching is expected to become the mainstream process for manganese extraction from pyrolusite in the future. 28,29 Titanium white waste acid is rich in a lot of FeSO 4 , which are in a low chemical valence state, and both have excellent electron donor capacity.…”

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confidence: 99%

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Recovery of Ti from titanium white waste acid with N1923 extraction and leaching of low‐grade pyrolusite using raffinate

Feng

2022

Asia-Pacific J Chem Eng

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Titanium dioxide industry produces a large amount of titanium white waste acid every year. In this work, to make full use of and recover valuable components in titanium white waste acid, a processing for recovery of Ti from titanium white waste acid with N1923 extraction and leaching of low-grade pyrolusite using raffinate was proposed. After a two-stage countercurrent extraction, 99.93% Ti was extracted, while 6.51% Fe, .11% Mg, .06% Mn, and .08% Al were co-extracted under N1923 concentration of 25% and phase ratio (O/A) of 2/1. The scrubbing efficiency of iron reached 98.53%, while the loss efficiency of titanium was only .94% with 1.5 mol/L sulfuric acid solution under the phase ratio of 1/1. Then, the Ti-loaded organic phase could be effectively stripped by .8 mol/L ammonia water; the single-stage stripping efficiency of titanium was 99.23%. Subsequently, the raffinate could be used for the extraction of manganese from low-grade pyrolusite. The leaching efficiency of manganese was 99.39% at the S/L ratio of 48.00 g/L, leaching temperature of 50 C, and leaching time of 40 min. In addition, thermodynamic calculations revealed that the titanium extraction process by N1923 from titanium white waste acid was an exothermic reaction. The proposed approach is suitable for co-recovery of titanium from titanium white waste acid and manganese from low-grade pyrolusite.

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Section: Introductionmentioning

confidence: 99%

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Recovery of Ti from titanium white waste acid with N1923 extraction and leaching of low‐grade pyrolusite using raffinate

Feng

2022

Asia-Pacific J Chem Eng

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“…At present, many reductive methods and agents have been reported for their feasibility and potential, such as the application of pyrite, sulfur dioxide, hydrogen sulphide, ferrous ion, organic wastewater, and glucose as reducing solvents for polymetallic nodules in the sulphuric acid system. [17][18][19][20] From these methods, the efficient extraction of multiple metals from manganese nodules is largely depended on the reducing leaching of Mn-Fe oxides, that is to say, Mn-Fe oxides of manganese nodule dissolution in the solution is a precondition for the metal extraction from manganese nodule in sulphuric acid solution.…”

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confidence: 99%

The effect of Fe³⁺ ions on the electrochemical behaviour of ocean manganese nodule reduction leaching in sulphuric acid solution

2022

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“…Although many methods for extracting metal resources in cobalt-rich crust such as fire reduction leaching [10][11][12], wet reduction leaching [13], or microbial leaching [14] have been studied, wet reduction leaching and microbial leaching have a series of shortcomings such as low efficiency, high cost, and large waste water output limiting application range [15]. Reductive roasting has long been regarded by researchers as a technically and economically viable technique due to its high efficiency and simple operation [16,17], which is to reduce the high-valence manganese oxide to a low valence by adding various reducing agents (pyrite, anthracite, sulfur dioxide, sulfur, biomass, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Fig 15. The mechanism of recovery of valuable metals and NaCl from cobalt-rich crust and industrial waste salt via roasting coupling technology…”

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Recovery of Valuable Metals and NaCl from Cobalt-Rich Crust and Industrial Waste Salt via Roasting Coupling Technology

Feng

et al. 2021

J. Sustain. Metall.

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Ocean cobalt crust has attracted much attention due to the high economic potential of various metals. A large amount of industrial waste salt is usually filled or deposited without treatment, causing severe environmental pollution and waste of salt resources. In this work, to recover valuable metals (Cu, Co, Ni, and Mn) and NaCl from cobalt-rich crust and industrial waste salt and diminish energy consumption, a roasting coupling technology has been proposed and process and mechanism were investigated. In the reduction roasting process, the organic matter in industrial waste salt was continuously pyrolyzed, producing a large amount of reducing gases such as CO, CH 4 , and H 2 , which could react with the MnO 2 and Fe 2 O 3 in the cobalt-rich crust to destroy its original crystal structure. The results revealed that the reduction process of cobalt-rich crust was gradually completed from the surface layer of particles to the core. The NaCl and Cu, Co, Ni, and Mn in the roasting residues can be recovered by water leaching and acid leaching, respectively. Under the mass ratio of industrial waste salt to ocean cobalt-rich crust of 7:5, the roasting temperature of 973.15 K, and the roasting time of 25 min, the leaching efficiency of Cu, Co, Ni, and Mn reached 96.03%, 97.98%, 98.52%, and 99.74%, respectively, and the 98.49% recovery rate of NaCl could be achieved. The present process may simultaneously realize the extraction of metals from the cobalt-rich crust and the resource utilization of waste salt.The contributing editor for this article was Zhi Sun.

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The limiting effect of manganese phase of oceanic cobalt-rich crust reduction by sawdust in acid leaching

Cited by 11 publications

References 21 publications

Recovery of Ti from titanium white waste acid with N1923 extraction and leaching of low‐grade pyrolusite using raffinate

Recovery of Ti from titanium white waste acid with N1923 extraction and leaching of low‐grade pyrolusite using raffinate

The effect of Fe³⁺ ions on the electrochemical behaviour of ocean manganese nodule reduction leaching in sulphuric acid solution

Recovery of Valuable Metals and NaCl from Cobalt-Rich Crust and Industrial Waste Salt via Roasting Coupling Technology

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The limiting effect of manganese phase of oceanic cobalt-rich crust reduction by sawdust in acid leaching

Cited by 11 publications

References 21 publications

Recovery of Ti from titanium white waste acid with N1923 extraction and leaching of low‐grade pyrolusite using raffinate

Recovery of Ti from titanium white waste acid with N1923 extraction and leaching of low‐grade pyrolusite using raffinate

The effect of Fe3+ ions on the electrochemical behaviour of ocean manganese nodule reduction leaching in sulphuric acid solution

Recovery of Valuable Metals and NaCl from Cobalt-Rich Crust and Industrial Waste Salt via Roasting Coupling Technology

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The effect of Fe³⁺ ions on the electrochemical behaviour of ocean manganese nodule reduction leaching in sulphuric acid solution