Abstract: In order to improve the utilization rate of multisource graphite solid waste and heating efficiency in winter.the experimental study on the preparation of electrothermal building plate was carried out by using graphite mining waste rock as aggregate and adding spherical graphite tailings material with different mass.The effects of spherical graphite tailings content,curing age and humidity on the electrical and mechanical properties of electrothermal building plate were investigated.The heating temperature and plate stability were studied by electric heating test.The results showed that:① the volume resistivity of electrothermal building plate is greatly affected by content of spherical graphite tailings and curing age,and the seepage threshold appears when the content of spherical graphite tailings is 9%.② The increase of curing age is beneficial to improve the mechanical properties of electrothermal building plate,but with the increase of spherical graphite tailings content,the mechanical strength increases first and then decreases,and the optimal content is 0.8%.③ When the content of spherical graphite tailings is 9%~11%,the final heating temperature of electrothermal building plate is 71~109 ℃ at 36 V alternating voltage voltage.After long time heating,the electrical properties are stable,which can provide technical indicators for the winter heating application of electrothermal building plate.

Key words: graphite solid waste,spherical graphite tailings,electrothermal building plate,volume resistivity,mechanical properties