多源石墨固废制备电热建筑板材成型试验研究

Experimental Study on Forming of Electrothermal Building Plate Prepared from Multi-source Graphite Solid Waste

为解决石墨矿山固废综合利用问题,通过质量取代法,将萝北云山石墨开采废石和球形石墨尾料替代水泥砂浆中的标准砂制备电热板材。在球形石墨尾料掺量7.41%、石粉掺量7%、开采废石完全替代标准砂的条件下,探讨了电热板材的成型方式和尺寸对其力学性能和电学性能的影响。结果表明,用振实成型方式制备的电热板材具有较高的力学强度,抗折强度为7.48 MPa,抗压强度为26.76 MPa;喷涂方式制备的电热板材具有较好的电学性能,体积电阻率为1.91Ω·m;采用振实成型方式,改变电热板材尺寸,薄板的力学强度和体积电阻率均高于厚板,抗折强度为7.48 MPa,抗压强度为35.78 MPa;最终固废使用比例达到75.6%,可为后续电热板材制作提供理论参考。

In order to solve the problem of comprehensive utilization of solid waste in graphite mines,the Luobei Yunshan graphite mining waste rock and spherical graphite tailings were used to replace standard sand in cement mortar to prepare elec-tric heating boards.Under the conditions of 7.41%content of spherical graphite tailings,7%content of stone powder,and com-plete replacement of standard sand by mining waste rock,the influence of the forming method and size of electric heating boards on their mechanical and electrical properties was explored.The results showed that the electric heating plate prepared by vibra-tion compaction has high mechanical strength,with a flexural strength of 7.48 MPa and a compressive strength of 26.76 MPa.The electric heating plate prepared by spraying method has good electrical properties,with a volume resistivity of 1.91Ω·m.By using vibration compaction forming method and changing the size of the electric heating plate,the mechanical strength and volume resistivity of the thin plate are higher than those of the thick plate,with a flexural strength of 7.48 MPa and a compres-sive strength of 35.78 MPa.The final proportion of solid waste usage reaches 75.6%,which can provide theoretical reference for the subsequent production of electric heating plates.