?Mathematical formulae have been encoded as MathML and are displayed in this HTML version using MathJax in order to improve their display. Uncheck the box to turn MathJax off. This feature requires Javascript. Click on a formula to zoom. ABSTRACT In the process of diamond wire cutting silicon wafers in the photovoltaic industry, tens of thousands of tons of high-purity silicon swarf are generated. There is an urgent need for the recycling and utilization of silicon swarf.