多源石墨固废制备电热板材配方试验研究

为了提高石墨固废利用率，本文以石墨开采废石为细骨料，添加球形石墨尾料以及不同质量分数的废石石粉进行电热板材配方试验，探究了石墨开采废石取代量、石粉掺量对电热板材性能的影响。结果表明：在100%(质量分数)使用石墨开采废石作为细骨料时，养护28 d的水泥板材抗折强度及抗压强度分别达到11.09 MPa和50.90 MPa,虽然略低于使用标准砂的水泥板材的强度指标，但是仍可满足相关要求，说明石墨开采废石可以作为细骨料使用；在废石石粉掺量为7%(质量分数)时，电热板材的抗折强度和抗压强度最高分别达到6.21 MPa和33.00 MPa,虽然强度有所降低，但是仍可满足低强度板材的要求；在球形石墨尾料掺量为9%(质量分数)时，电热板材体积电阻率为1.94Ω·m,发热温度为71℃,具有良好的电热效果。

Experimental Study on Formula of Electrothermal Plate Prepared from Multi-Source Graphite Solid Waste

In order to improve the utilization rate of graphite solid waste, this paper used graphite mining waste stone as fine aggregate, added spherical graphite tailing and waste stone stone powder with different mass fraction to carry out an experimental study on the formula of electrothermal plate. The influences of graphite mining waste stone replacement and stone powder content on the performance of electrothermal plate were explored. The results show that using 100% (mass fraction) graphite mining waste stone as fine aggregate, the bending strength and compressive strength of cement plate maintained for 28 d are 11.09 MPa and 50.90 MPa, respectively. Although they are slightly lower than the strength index of cement plate using standard sand, but they meet the relevant requirements. This shows that graphite mining waste stone can be used as fine aggregate. When waste stone stone powder content is 7% (mass fraction), the bending strength and compressive strength of electrothermal plate reach up to 6.21 MPa and 33.00 MPa. Although the strength is reduced, it can still meet the requirements of low-strength plate. When spherical graphite tailing content is 9% (mass fraction), the volume resistivity of electrothermal plate is 1.94 Ω·m, and the heating temperature is 71 ℃, which has a good electrothermal effect.