Separation Between Silicon and Aluminum Powders Contained Within Pulverized Scraped Silicon-Based Waste Solar Cells by Flotation Method

Sho Harada, Md Azhar Uddin, Yoshiei Kato, Takanori Kawanishi, Yoshiaki Hayashi

Research output: Contribution to journalArticle

Abstract

There are few study examples on the separation of metals by floating method. In this study, separation of silicon and aluminum, which are the main components of silicon-based solar cell module, was carried out by floating method in order to purify silicon from waste solar cell module. The selection of surfactant, control of electric charge, wettability of the solid particles, surface tensions, and bubble surface area are important for separation of solids by floating method. Sodium dodecyl sulfate (SDS) can increase the hydrophobicity of aluminum powder due to the difference of surface potentials between silicon and aluminum. SDS behaves as a collector of aluminum as well as a frothing agent to decrease the bubble size. At a SDS concentration of 2 g/L and sample dipping time of 10 min, 80.1 mass% of aluminum was floated and separated, and the sedimentary silicon reached a purity of 90.7% from a mixture of 50 mass% aluminum and 50 mass% silicon. Finally, at a pH value of 7.0, SDS concentration between 1.0 and 2.5 g/L and air flow rate of 2.5 L/min (STP) were suitable experimental conditions to purify silicon from a mixture of silicon and aluminum by flotation separation method.

Original languageEnglish
JournalJournal of Sustainable Metallurgy
DOIs
Publication statusAccepted/In press - Jan 1 2019

Fingerprint

Silicon
Flotation
Aluminum
Powders
silicon
Solar cells
aluminum
Sodium dodecyl sulfate
Sodium Dodecyl Sulfate
sodium
sulfate
bubble
Electric charge
method
solar cell
flotation
wettability
surface tension
Surface potential
hydrophobicity

Keywords

  • Floating separation
  • Flotation
  • Silicon
  • Sodium dodecyl sulfate
  • Waste solar cell module

ASJC Scopus subject areas

  • Environmental Science (miscellaneous)
  • Mechanics of Materials
  • Metals and Alloys

Cite this

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title = "Separation Between Silicon and Aluminum Powders Contained Within Pulverized Scraped Silicon-Based Waste Solar Cells by Flotation Method",
abstract = "There are few study examples on the separation of metals by floating method. In this study, separation of silicon and aluminum, which are the main components of silicon-based solar cell module, was carried out by floating method in order to purify silicon from waste solar cell module. The selection of surfactant, control of electric charge, wettability of the solid particles, surface tensions, and bubble surface area are important for separation of solids by floating method. Sodium dodecyl sulfate (SDS) can increase the hydrophobicity of aluminum powder due to the difference of surface potentials between silicon and aluminum. SDS behaves as a collector of aluminum as well as a frothing agent to decrease the bubble size. At a SDS concentration of 2 g/L and sample dipping time of 10 min, 80.1 mass{\%} of aluminum was floated and separated, and the sedimentary silicon reached a purity of 90.7{\%} from a mixture of 50 mass{\%} aluminum and 50 mass{\%} silicon. Finally, at a pH value of 7.0, SDS concentration between 1.0 and 2.5 g/L and air flow rate of 2.5 L/min (STP) were suitable experimental conditions to purify silicon from a mixture of silicon and aluminum by flotation separation method.",
keywords = "Floating separation, Flotation, Silicon, Sodium dodecyl sulfate, Waste solar cell module",
author = "Sho Harada and Uddin, {Md Azhar} and Yoshiei Kato and Takanori Kawanishi and Yoshiaki Hayashi",
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AU - Harada, Sho

AU - Uddin, Md Azhar

AU - Kato, Yoshiei

AU - Kawanishi, Takanori

AU - Hayashi, Yoshiaki

PY - 2019/1/1

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AB - There are few study examples on the separation of metals by floating method. In this study, separation of silicon and aluminum, which are the main components of silicon-based solar cell module, was carried out by floating method in order to purify silicon from waste solar cell module. The selection of surfactant, control of electric charge, wettability of the solid particles, surface tensions, and bubble surface area are important for separation of solids by floating method. Sodium dodecyl sulfate (SDS) can increase the hydrophobicity of aluminum powder due to the difference of surface potentials between silicon and aluminum. SDS behaves as a collector of aluminum as well as a frothing agent to decrease the bubble size. At a SDS concentration of 2 g/L and sample dipping time of 10 min, 80.1 mass% of aluminum was floated and separated, and the sedimentary silicon reached a purity of 90.7% from a mixture of 50 mass% aluminum and 50 mass% silicon. Finally, at a pH value of 7.0, SDS concentration between 1.0 and 2.5 g/L and air flow rate of 2.5 L/min (STP) were suitable experimental conditions to purify silicon from a mixture of silicon and aluminum by flotation separation method.

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