石墨固废基电热板材电学性能研究

Study on Electrical Properties of Graphite Solid Waste-Based Electric Heating Plates

在水泥砂浆体系中加入石墨可以制得性能较好的发热板材。为探究不同外加电场、不同湿度温度条件下石墨电热板材的发热、体积电阻率的关系,利用石墨固体废弃物、石墨选矿尾矿和球形石墨尾料制备电热板材,采用试验、统计分析等不同方法进行了分析。结果表明,交流电压对石墨电热板升温效果更佳,球形石墨尾料掺量达到渗流阈值(9%石墨掺量)后,电热板材的电阻率、发热性能稳定。在环境温度10~30℃、环境湿度20%~80%范围内,电阻率保持在2.5Ω·m左右,不易受环境温度湿度等因素影响,成本低廉,易于应用。

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 2.5Ω·m,which is not easily affected by factors such as ambient temperature and humidity,and is low in cost and easy to apply.