Kinetic mechanism of aluminum removal from diamond wire saw powder in HCl solution

Yang, Shicong; Wei, Kuixian; Ma, Wenhui; Xie, Ke; Wu, Jijun; Lei, Yun

doi:10.1016/j.jhazmat.2019.01.020

Cited by 65 publications

(18 citation statements)

References 37 publications

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“…The first viewpoint holds that the removal of Fe from DWSSP with H 2 SO 4 leaching during the silicon purification process can be divided into two stages. In both stages, the leaching process is controlled by the second-order rate of a homogeneous reaction model . This assertion is consistent with the homogeneous reaction kinetic model previously published by the authors .…”

Section: Introductionsupporting

confidence: 88%

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Occurrence State and Dissolution Mechanism of Metallic Impurities in Diamond Wire Saw Silicon Powder

Yang

Wan

Wei

et al. 2020

ACS Sustainable Chem. Eng.

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The facilitation of metallic impurities removal via acid leaching pretreatment plays a key role in silicon recovery from diamond wire saw silicon powder (DWSSP) waste. Disappointingly, the occurrence state and dissolution mechanism of the metallic impurities present in DWSSP have not yet been revealed. For this reason, in this study, three different kinds of raw DWSSP were used for acid leaching tests and leaching behavior verification to investigate the dissolution mechanism. After two-stage acid leaching with 4 M HCl and 2 M HCl + 2.5 M HF, the results indicate that the removal efficiency was superior to that of other previously reported leaching processes. Furthermore, two occurrence states of metallic impurities present in DWSSP were defined based on their different dissolution behaviors, and the intrinsic relationship between dissolution behavior and the thinning process of the amorphous SiO2 shell was derived. The findings indicate that the first type of impurity was more easily dissolved in HCl solution; however, the second type of retained metallic impurity was restricted by the SiO2 shell barrier and was removed by the added HF solution. For this reason, the disintegration dissolution of the amorphous SiO2 shell was found to have a significant impact on the facilitation of the removal of impurities retained in DWSSP. The findings of this study are significant for the recovery of silicon from DWSSP with an effective acid leaching flow design.

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Section: Introductionsupporting

confidence: 88%

“…However, no individual impurity fragments were observed. This mapping result is consistent with a former kinetic mechanism revealed by a homogeneous model …”

Section: Experimental Methodsmentioning

confidence: 99%

Occurrence State and Dissolution Mechanism of Metallic Impurities in Diamond Wire Saw Silicon Powder

Yang

Wan

Wei

et al. 2020

ACS Sustainable Chem. Eng.

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“…After carbonization, four SiNPs-TC4NPs@C (Si@C/TiO 2 @C/Al 2 O 3 @C) composites with different ratios were prepared. Furthermore, Al 2 O 3 of Si@C/TiO 2 @C/Al 2 O 3 @C composites was removed by HCl leaching (HCl concentration: 4 mol•L −1 ; leaching temperature: 60 °C; reaction time: 3 h; and liquid−solid ratio: 10:1 38 ) to obtain Si@C/TiO 2 @C/Hollow-C composites. The disadvantage of the synthetic route is that the process of the ball milling and sand milling takes a long time and the preparation process of this special structure is a bit cumbersome.…”

Section: Preparation Of Si Nanoparticles and Tc4 Nanoparticlesmentioning

confidence: 99%

Si@C/TiO₂@C/Hollow-C Nanocomposite as a Lithium-Ion Battery Anode Produced by Refining Silicon and Ti–6Al–4V Residuals

Chen

Lin

et al. 2021

ACS Appl. Energy Mater.

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TC4 (Ti–6Al–4V) nanoparticles (TC4NPs) and silicon nanoparticles (SiNPs) with a median size of 146 and 51 nm were prepared by sand milling from scrap produced by refining silicon and TC4. The SiNPs and TC4NPs are mixed, carbonized, and leached in different proportions to obtain Si@C/TiO2@C/Hollow-C anode materials. The special structure of the anode materials provided more space for the volume expansion of silicon. The anatase TiO2 in TC4NPs relieves the volume expansion and reduces the transfer impedance, and the lithiated TiO2 can promote the electrical conductivity of the Si@C/TiO2@C/Hollow-C anode during the charge/discharge process. Furthermore, the Si@C/TiO2@C/Hollow-C (SiNPs/TC4NPs = 2:1) electrode delivers excellent rate performance; after cycling at a series of higher current densities, 92% of the original level of the reversible capacity can be maintained. The Si@C/TiO2@C/Hollow-C (SiNPs/TC4NPs = 2:1) anode retains 558 mA h·g–1 after 400 cycles with a large current density of 1000 mA·g–1. The synthesis method of the Si@C/TiO2@C/Hollow-C anode is a low-cost, facile, and nontoxic process, endowing it with the potential for application as energy materials for mass production.

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“…Several studies have investigated hydrometallurgy processes by using strong mineral acids (HCl, HNO 3 , and H 2 SO 4 ) for leaching of heavy metals from various solids such as soil, sludge, electronic waste, fly ash, etc. [18][19][20][21]. Low pH obtained with the strong mineral acids resulted in high metal removal efficiencies.…”

Section: Introductionmentioning

confidence: 99%

“…The leaching of metals such as aluminum, chromium, copper, iron, and zinc increased at very low or high pH values. Yang et al [20] studied the removal of aluminum from the diamond wire saw powder by HCl leaching method. These authors also studied the effect of operating conditions such as the concentration of HCl, the leaching temperature, the reaction time, and the liquid-solid ratio in the extraction efficiency.…”

Section: Introductionmentioning

confidence: 99%

Column Leaching Tests to Valorize a Solid Waste from the Decommissioning of Coal-Fired Power Plants

et al. 2019

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Solid waste from the decommissioning of coal-fired power plants collected from a power plant in Spain (Puertollano, Ciudad Real) was subjected to acid leaching tests in columns to evaluate the leachability of several valuable and toxic metals (Al, Ca, Fe, K, Mg, Na, Ti, V, Cr, Mn, Ni, and Zn). First, the contaminated waste, delivered by a national company, was chemically characterized. Second, column-leaching tests were conducted using two different acid solutions (nitric and sulfuric acid). The effect of the leaching agent concentration and time of leaching were examined. The results of column leaching tests showed that different concentrations of the acid solutions leached different proportions of Al, Fe, Mg, Mn, Ni, V, and Zn, which were leached by acid solutions from the solid waste sample. In general, use of sulfuric acid at pH 0.5 resulted in better leaching. Next, a comparison between three different configurations (one single stage without recirculation, one single stage with total recirculation of leachate and leaching in two consecutive stages: one with total recirculation of leachate and another one with acid set to a pH value of 0.5 and without recirculation) was performed. At the end of the experiments, all leaching methods resulted in comparable yields for Al (0.36–0.48%), Fe (5.99–6.40%), Mg (4.43–5.11%), Mn (2.71–2.83%), Ni (12.08–12.75%), V (0.08–0.34%), and Zn (23.62–25.28%). However, better results were obtained when two consecutive stages were carried out. Additionally, the effect of forced aeration on leachability was studied. Finally, this investigation showed that hydrometallurgical treatment of contaminated solid by means of acid leaching followed by basic leaching and a water wash between these stages was a potentially feasible method for reducing hazardous levels of the residue.

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Kinetic mechanism of aluminum removal from diamond wire saw powder in HCl solution

Cited by 65 publications

References 37 publications

Occurrence State and Dissolution Mechanism of Metallic Impurities in Diamond Wire Saw Silicon Powder

Occurrence State and Dissolution Mechanism of Metallic Impurities in Diamond Wire Saw Silicon Powder

Si@C/TiO₂@C/Hollow-C Nanocomposite as a Lithium-Ion Battery Anode Produced by Refining Silicon and Ti–6Al–4V Residuals

Column Leaching Tests to Valorize a Solid Waste from the Decommissioning of Coal-Fired Power Plants

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Kinetic mechanism of aluminum removal from diamond wire saw powder in HCl solution

Cited by 65 publications

References 37 publications

Occurrence State and Dissolution Mechanism of Metallic Impurities in Diamond Wire Saw Silicon Powder

Occurrence State and Dissolution Mechanism of Metallic Impurities in Diamond Wire Saw Silicon Powder

Si@C/TiO2@C/Hollow-C Nanocomposite as a Lithium-Ion Battery Anode Produced by Refining Silicon and Ti–6Al–4V Residuals

Column Leaching Tests to Valorize a Solid Waste from the Decommissioning of Coal-Fired Power Plants

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Product

Resources

About

Si@C/TiO₂@C/Hollow-C Nanocomposite as a Lithium-Ion Battery Anode Produced by Refining Silicon and Ti–6Al–4V Residuals