Al-Si Alloys Were Prepared From Crystalline Silicon Diamond Wire Cutting Waste

Driven by the photovoltaic industry,the diamond wire cutting process has become the current mainstream silicon wafer cutting method.During the cutting process,about 30%-40% of the crystalline silicon enters the coolant in the powder state to form the diamond wire cutting silicon waste(DWSSP).The waste of resources also leads to an increase in the cost of silicon wafers,causing a certain environmental burden.This topic uses DWSSP as the raw material to prepare aluminum-silicon alloy by electromagnetic fusion,and to recycle it,which has major economic and environmental benefits.First,use X-ray fluorescence spectrometer(XRF)and X-ray diffractometer(XRD)to analyze the elements and phases of DWSSP.The results show that elemental silicon accounts for 88.54%,silicon dioxide accounts for 10.16%,and other impurities and metal oxides account for about 1.5%.During the experiment,DWSSP and aluminum particles were directly mixed and melted to determine the appropriate heating temperature and holding time under a certain mixing ratio;Na2CO3,CaO,and CaO-Na3 AlF6 and DWSSP were selected as additives for alloying experiments,and DWSSP was calculated.The scrap utilization rate and aluminum loss rate in the process of alloying with Al particles;in order to solve the segregation behavior of the silicon phase,it is proposed to conduct directional solidification during the DWSSP alloying process,and discuss the segregation behavior of Ca impurities during the directional solidification process,the pull-down rate,and the initial silicon The influence of the content on the separation effect of the remaining alloy part and the primary silicon;finally,from the perspective of the electromagnetic separation of high silicon aluminum silicon alloy and the alloy quality,the modification behavior of Sb in the electromagnetic separation process of high silicon aluminum silicon alloy is studied,and the high silicon aluminum silicon alloy is studied.During the electromagnetic separation of aluminum-silicon alloy(Al-Si45 wt.%)melt,the effect of Sb addition,pull-down rate,temperature,etc.on the separation effect,and the combination of numerical simulation,grain refinement and aluminum-silicon alloy binary phase Figure analyzes its deterioration mechanism.The results show that: during the direct mixing and melting process of DWSSP(15%)and Al particles,the heating temperature should be kept above 1400?,and the holding time should be 40 minutes.As the proportion of DWSSP in the mixture increases,the waste utilization rate decreases at the same time The aluminum loss rate increases.In the alloying experiment with Na2CO3,CaO,CaO-Na3 AlF6 and DWSSP as additives,CaO-Na3 AlF6 has the best alloying effect as an additive.Its cutting waste utilization rate is 85.37%,and the aluminum loss rate is 3.53%.Aiming at the directional solidification in the DWSSP alloying process,it can effectively solve the segregation behavior of primary crystal silicon in the alloy.While preparing the eutectic Al-Si alloy,the primary crystal silicon can be purified after being refined by Al-Si flux.In the process of electromagnetic separation of high-silicon aluminum-silicon alloy(45wt.%Si)melt,the eutectic temperature of the alloy decreases after the addition of the modifier Sb,and the eutectic silicon phase is refined in the ?-Al matrix,and the primary silicon The enrichment effect has been improved.