Preparation of High Temperature Sensible Heat Storage Material from Vanadium Extraction Tailings and Graphite

The high temperature sensible heat storage material was prepared via powder metallurgy method,using the iron extraction tailing obtained by carbothermal reduction of the vanadium extraction tailing as the raw material and graphite as the modifier respectively.XRD results show that the main phases of the thermal storage material include Na_6.65Al_6.24Si_9.76O₃₂,aluminosilicate,ilmenite and graphite.With increase of the graphite content,both of the density and hardness of the thermal storage material decrease,while the thermal conductivity increases.The DSC results show that the specific heat capacity is higher in the medium and high temperature region above 500℃.It is shown that the heat storage density of the sensible heat storage material is 223 k J/kg at 500～750℃,with the heat storage capacity of 0.062 k Wh/kg and the mass required for 1 000 k Wh heat storage of 16 000 kg.The thermal storage material prepared in this study has good thermal storage capacity at temperatures above 500℃,which can be used in high temperature thermal storage system.