光伏固废硅泥用作硅热法炼镁还原剂的可行性研究  

Feasibility study of photovoltaic solid waste silicon sludge as reductant for magnesium production by silicothermic process

作　　者：冯雪楠 方华靖 邓浩 王悦存[1,2,3] 杜超 单智伟 FENG Xuenan;FANG Huajing;DENG Hao;WANG Yuecun;DU Chao;SHAN Zhiwei(State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710000,China;Engineering Research Center for Magnesium-based New Materials,Xi’an Jiaotong University,Xi’an 710000,China;School of Materials Science and Engineering,Xi'an Jiaotong University,Xi’an 710000,China;Manufacturing Business Group Wafer Business Unit,Longi Green Energy Technology Co.,Ltd.,Xi’an 710000,China)

机构地区：[1]西安交通大学金属材料强度国家重点实验室,西安710000 [2]西安交通大学陕西省镁基新材料工程研究中心,西安710000 [3]西安交通大学材料科学与工程学院,西安710000 [4]隆基绿能科技股份有限公司制造事业群硅片事业部,西安710000

出　　处：《中国有色金属学报》2024年第3期899-907,共9页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(52031011)。

摘　　要：目前硅热法炼镁工艺所用的还原剂为硅铁,生产硅铁的能耗占硅热法炼镁工艺总能耗的近四分之一、其成本占总原料成本的60%以上,因此,亟需寻求新的低能耗、低成本还原剂助力炼镁工艺向绿色高效的方向发展。本工作提出利用光伏固废硅泥替代硅铁作还原剂的设想,通过实验验证与成本核算证明了其可行性。将干燥后的硅泥与75#硅铁分别作为硅热法炼镁工艺的还原剂进行测试,结果表明:硅泥中单质硅含量更高,且其粒径远小于75#硅铁,使得硅泥做还原剂的硅热反应还原率提升超过5%,所制备的粗镁中杂质元素含量仅为75#硅铁中的40%~80%。用硅泥替代75#硅铁生产金属镁,每吨粗镁的还原剂成本可降低1000余元,同时伴随其他原料吨镁消耗量的下降和镁品质的提升,为生产企业带来显著经济效益。The reductant used in silicothermic process of magnesium production is ferrosilicon,its production energy consumption account for nearly a quarter of the total energy consumption of the entire process,and its cost accounts for more than 60%of the total raw material cost.So,it is urgent to seek new low-energy and low-cost reductant to help the magnesium production process develop in a green and efficient direction.In this work,the idea of replacing ferrosilicon with photovoltaic solid waste silicon sludge as reductant was proposed,and its feasibility was proved through experimental verification and cost accounting.The dried silicon sludge and 75#ferrosilicon were,respectively,tested as reductant in the silicothermic process of magnesium production.The results show that the silicon sludge has a higher elemental silicon content and particle size much smaller than 75#ferrosilicon,which makes the conversion of silicon sludge as a reductant increase by more than 5%,and the impurity content of crown magnesium are only 40%−80%of 75#ferrosilicon.Using silicon sludge instead of 75#ferrosilicon to produce magnesium,the cost of reductant per ton of crown magnesium can be reduced by more than 1000 yuan,and with the decline of magnesium consumption per ton of other raw materials and the improvement of magnesium quality,it brings significant economic benefits to production enterprises.

关 键 词：硅热法 能耗 光伏 硅泥 还原率 

分 类 号：TF822[冶金工程—有色金属冶金]