Experimental Study On The Preparation Of Aluminum-silicon Alloy Using Single Crystal Silicon Cutting Wast

According to data,China will have 305.99 GW of installed solar power generation capacity by 2021,and each GW will require roughly 25 tons of monocrystalline silicon.When monocrystalline silicon wafers are cut,about 30%to 35%of the monocrystalline silicon rods are lost,creating diamond wire cutting silicon waste（DWSSP）.It will squander resources if it is not used,and it will badly contaminate the environment if it is not used.Al-Si alloy was created in this study using DWSSP and high temperature melting of aluminum atoms.During the creation of hypoeutectic and high silicon Al-Si alloy,the impacts of various process variables and additive ratios on the utilization rate of silicon and the loss rate of aluminum in cutting waste as well as the effect on grain refinement were explored.The findings indicate that:（1）The DWSSP’s components and phases were identified.According to the findings,monocrystalline silicon made up 88.48%of the sample,while other metal impurities made up roughly 0.18%.Particles between 1.24 and 3.28μm in size make up 99.48%of the entire product.Cutting waste is discovered to have an uneven flake shape at the microscopic level.（2）While too much or too little heating power can reduce the utilization of silicon,the right amount of heating power will benefit DWSSP utilization and alloy quality.Lack of holding time will result in an alloy with too many impurities,which will negatively impact the alloy’s quality.Longer holding periods will result in higher energy use and more aluminum loss.Si can be more efficiently utilized in DWSSP.The alloy’s silicon consumption rate and aluminum loss rate will be impacted by the addition of Na₂CO₃ and CaO,respectively.The findings indicate that silicon is utilized at a rate of 62.45%and aluminum is lost at a rate of 45.10%under the conditions of heating power of 10 k W,holding period of 45 min,and addition of 10%CaO+10%Na₂CO₃.（3）The prolongation of holding time aids in the refinement of grains in the melt when creating high-silicon Al-Si alloy from pure silicon pure aluminum.Energy use will be excessive if the holding period is too long.The average grain size may be increased to 2.432 mm with the addition of 1%Na₂HPO₄,and the degree of grain refining is 56.993%.Even while excessive Na₂HPO₄ addition causes grain coarsening,it can nevertheless contribute to grain refining.（4）In the process of preparing high silicon alloy by DWSSP and aluminum particles,the co-addition of CaO and Na₂CO₃ will lead to the pelletization of the alloy and the block alloy cannot be formed.Na₂HPO₄ can still play a role in refining the alloy in the waste.After measurement,the average grain size is 1.11 mm and the degree of refinement is 45.05%.CaO and Na₂CO₃ can bring some Al and Si elements into the slag phase,so that the grain has a tendency to refine.