关键词: 石墨固废, 电热建筑板材, 成型方式, 板材尺寸

Abstract: 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 electric heating boards. Under the conditions of 7. 41% content of spherical graphite tailings,7% content of stone powder,and complete 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 vibration 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. 91 Ω· 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 compressive 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.

Key words: graphite solid waste,electric heating building plate,forming method,plate size