Silicon recovery from metallurgical-grade silicon refined slag by flotation using terpenic oil as surfactant

Tan, Na; Han, Shifeng; Wei, Kuixian; Ma, Wenhui; Wu, Dandan

doi:10.1016/j.jclepro.2021.129550

Cited by 8 publications

(4 citation statements)

References 39 publications

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“…5. Following high-temperature slag formation, the upper part of the slag-enriched sample and the lower part of the silicon-enriched sample were observed, due to the different densities of Si and slag [19]. At the end of each experiment, slag in the red area was taken and cut into two parts along the longitudinal direction.…”

Section: Slag Results For Different Ratios Of Dwssp and Caomentioning

confidence: 99%

Composition and structural identification of silicon particles in diamond wire saw silicon powder

Zhang,

Wei,

Yang

et al. 2023

Phosphorus, Sulfur, and Silicon and the Related Elements

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Improving the effective utilization of diamond wire saw silicon powder (DWSSP) waste is bene cial to increasing the production pro t of the photovoltaic (PV) industry. It is also important to reduce the emissions of DWSSP to control environmental pollution. However, the surface oxides of silicon particles in DWSSP hinder its effective utilization. In this study, ve raw DWSSP materials with different oxygen contents were used to reveal the composition and structure of surface oxides. Initially, the presence of amorphous SiO 2 was proved by crystal transformation. Then, the SiO 2 content was determined by SiO 2 -CaO phase diagram analysis, and the SiO x content was determined by using the oxygen conservation rule. The variation trend between the SiO 2 , SiO x , and Si contents in DWSSP and the O content was determined, according to the SiO 2 and SiO x contents. Furthermore, the systematic study of raw DWSSP leads to general formula of the SiO 2 , SiO x , and Si contents with the total O content can be obtained. The three-layer structure of DWSSP was revealed, the DWSSP consisting of a Si core, an intermediate SiO x layer, and a SiO 2 shell. This study can accurately identify the composition and structure of DWSSP and provide a better theoretical basis for the selection and design of the DWSSP recovery process.

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Section: Slag Results For Different Ratios Of Dwssp and Caomentioning

confidence: 99%

Composition and structural identification of silicon particles in diamond wire saw silicon powder

Zhang,

Wei,

Yang

et al. 2023

Phosphorus, Sulfur, and Silicon and the Related Elements

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“…(2) Silicon and slag content analysis of MGSRS The content of silicon and slag in MGSRS and recovered silicon was determined using the hydrochloric acid dissolution method and HNO 3 /HF mixed acid dissolution method [21].…”

Section: Analysis Methods (1) Micromorphology Analysis Of Mgsrsmentioning

confidence: 99%

“…Tan et al [19] researched the recovery of silicon from MGSRS. The slag was crushed and ground to obtain a ne powder suitable for otation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Grinding Liberation on Recovery of Silicon from MG-Si Waste Slag by Flotation

Tan,

Han,

Wei

et al. 2024

Silicon

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Metallurgical-grade silicon-re ned waste slag (MGSRS) was produced during the MG-Si re ning production process, which occupies huge amounts of land resources, caused the loss of nearly 110,000 tons of MG-Si every year. Though, it is of great signi cance to recover the elemental silicon in MGSRS.However, because silicon is tightly wrapped by slag and di cult to separate, resulting in the di culty of silicon recovery. In this study, silicon recovery powders were obtained through the process of grinding liberation and otation separation. The effect of grinding time on the liberation of MGSRS and the otation recovery of silicon was studied. The liberation mechanism of MGSRS was further discussed. The results showed that the liberation degree of silicon particles was 79.45% (grinding for 15 min), which was 7.94% higher than that of silicon particles after 5 min grinding time, and 77.15% of the silicon particles were fully liberated. The otation recovery of silicon can increase from 10.5-78.7% with the appropriate collector. Mechanism study shows that during the grinding process, silicon was separated along the (111) surface, and Ca 2 Al 2 SiO 7 had the largest amount of liberation along the (211) plane. More unsaturated sites of aluminum and calcium ions were observed on the silicate surface, which were favorable for adsorption with the reagent and bene cial to the silicon recovery. These results indicated that the silicon and slag of MGSRS can be su ciently separated through grinding and otation, and the purity of recovered silicon is about 70%. The silicon resources in MGSRS were recovered economically and could be used as the raw materials for the preparation of silicon alloy and high purity silicon.

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“…With the demand of green and sustainable development of resources, it is of great signi cance to recover the elemental silicon in MGSRS. While silicon is tightly wrapped by slag and di cult to separate in MGSRS, which extremely limits the recovery of the silicon [9].Therefore, developing an e cient method for separating silicon and slag, which is the key to realizing silicon e cient recovery, has become the focus of researchers.…”

Section: Introductionmentioning

confidence: 99%

Effect of grinding liberation on recovery of silicon from MG-Si waste slag by flotation

Tan,

Han,

Wei

et al. 2024

Preprint

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Metallurgical-grade silicon-refined waste slag (MGSRS) was produced during the MG-Si refining production process, which occupies huge amounts of land resources, caused the loss of nearly 110,000 tons of MG-Si every year. Though, it is of great significance to recover the elemental silicon in MGSRS. However, because silicon is tightly wrapped by slag and difficult to separate, resulting in the difficulty of silicon recovery. In this study, silicon recovery powders were obtained through the process of grinding liberation and flotation separation. The effect of grinding time on the liberation of MGSRS and the flotation recovery of silicon was studied. The liberation mechanism of MGSRS was further discussed. The results showed that the liberation degree of silicon particles was 79.45% (grinding for 15 min), which was 7.94% higher than that of silicon particles after 5 min grinding time, and 77.15% of the silicon particles were fully liberated. The flotation recovery of silicon can increase from 10.5–78.7% with the appropriate collector. Mechanism study shows that during the grinding process, silicon was separated along the (111) surface, and Ca2Al2SiO7 had the largest amount of liberation along the (211) plane. More unsaturated sites of aluminum and calcium ions were observed on the silicate surface, which were favorable for adsorption with the reagent and beneficial to the silicon recovery. These results indicated that the silicon and slag of MGSRS can be sufficiently separated through grinding and flotation, and the purity of recovered silicon is about 70%. The silicon resources in MGSRS were recovered economically and could be used as the raw materials for the preparation of silicon alloy and high purity silicon.

show abstract

Silicon recovery from metallurgical-grade silicon refined slag by flotation using terpenic oil as surfactant

Cited by 8 publications

References 39 publications

Composition and structural identification of silicon particles in diamond wire saw silicon powder

Composition and structural identification of silicon particles in diamond wire saw silicon powder

Effect of Grinding Liberation on Recovery of Silicon from MG-Si Waste Slag by Flotation

Effect of grinding liberation on recovery of silicon from MG-Si waste slag by flotation

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