Publication

Method for recovering silicon from sawing waste

Patrik Willi Hoffmann
2009
Patents

Abstract

A method for separating and recovering silicon debris from sawing waste is characterized in that it comprises the following steps: - treating the sawing waste so as to deoxidize the silicon debris in a manner that reduces their surface energy, - applying to the sawing waste thus treated a flotation method using a flotation liquid and a nonoxidizing flotation gas, and - recovering the silicon debris at the surface of the flotation liquid.

Official source

https://infoscience.epfl.ch/entities/publication/d28bac56-e7f0-4896-b6e4-870f43daec04

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Patrik Willi Hoffmann
2009
Patents

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/d28bac56-e7f0-4896-b6e4-870f43daec04

About this result

Related concepts (15)

Surface tension

Surface tension is the tendency of liquid surfaces at rest to shrink into the minimum surface area possible. Surface tension is what allows objects with a higher density than water such as razor blades and insects (e.g. water striders) to float on a water surface without becoming even partly submerged. At liquid–air interfaces, surface tension results from the greater attraction of liquid molecules to each other (due to cohesion) than to the molecules in the air (due to adhesion). There are two primary mechanisms in play.

Froth flotation

Froth flotation is a process for selectively separating hydrophobic materials from hydrophilic. This is used in mineral processing, paper recycling and waste-water treatment industries. Historically this was first used in the mining industry, where it was one of the great enabling technologies of the 20th century. It has been described as "the single most important operation used for the recovery and upgrading of sulfide ores". The development of froth flotation has improved the recovery of valuable minerals, such as copper- and lead-bearing minerals.

Surface energy

In surface science, surface free energy (also interfacial free energy or surface energy) quantifies the disruption of intermolecular bonds that occurs when a surface is created. In solid-state physics, surfaces must be intrinsically less energetically favorable than the bulk of the material (the atoms on the surface have more energy compared with the atoms in the bulk), otherwise there would be a driving force for surfaces to be created, removing the bulk of the material (see sublimation).

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