Silicon Carbide Recovery from Cutting Fluid Waste: Evolution of Recycling Performance for Valorization with Higher Added Value
Source abstract
Abstract
The amount of cutting fluid waste composed of polyethylene glycol, silicon carbide, silicon and metals fragments (e.g. Fe, Zn, Mn and Ni) increase as silicon wafer production raises. In the present work, we propose a low-cost and easy approach to recover SiC particles from slurry waste. The process consists to combine acid leaching, alkaline dissolution and deoxidation. This research focuses too on the impact of native silicon dioxide layer evolution occurring on the surfaces of SiC particles on the recovering efficiency and purity. The effect fluorhydric acid concentration was explored. A double wall cell was used as magnetic reactor in order to achieve the dissolution of metal fragments and silicon dissolution under highly-alkaline conditions (pH ≥ 13) at a temperature above 60 °C. The morphology evolution of SiC grains after several sawing operations of silicon ingot is also discussed. The SiC powder was successfully recycled by converting all the silicon species into sodium silicate solution with a recovery efficiency and purity of 98.8% and 97.69% respectively. The recovered SiC was characterized by XRD, SEM-EDAX and optical microscopy.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced Surface Polishing Techniques · Advanced ceramic materials synthesis · Aluminum Alloys Composites Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (38)
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