Feasibility study of photovoltaic solid waste silicon sludge as reductant for magnesium production by silicothermic process
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.
NETL
NSTL
万方数据
维普
