Abstract: Adding graphite to the cement mortar system can make a heating plate with better performance. In order to explore the relationship between heating and volume resistivity of graphite electric heating plates under different external electric fields,different humidity and temperature conditions,graphite solid waste,graphite beneficiation tailings and spherical graphite tailings were used to prepare electric heating plates,and different methods such as experiments and statistical analysis were used. The results showed that the AC voltage has a better heating effect on the graphite electric heating plate,and the resistivity and heating performance of the electric heating plate are stable after the addition of spherical graphite tailings reaching the percolation threshold (9% graphite content). In the range of ambient temperature 10~ 30 ℃ and ambient humidity 20% ~ 80%, the resistivity is maintained at about 2. 5 Ω· m,which is not easily affected by factors such as ambient temperature and humidity,and is low in cost and easy to apply.

Key words: graphite solid waste,electric heating plate,electric heating effect,indoor heating