无烟煤石墨化的研究

STUDY ON GRAHPITIZATION OF ANTHRACITES

以宁夏、山西、贵州、云南和越南鸿基5种不同产地的无烟煤为原料,研究了无烟煤石墨化的机理;同时对5种石墨化煤样进行了工业分析和X射线衍射分析,还对用5种石墨化煤作成的炭砖小样进行了全面的性能分析。结果发现,经高温处理后无烟煤是可以石墨化的,但石墨化煤与人造石墨又有区别;石墨化煤与气煅煤和电煅煤相比,性能质量明显改善,灰分、硫分和电阻率均降低,真密度提高;用石墨化煤作成的炭砖小样,除了抗压强度有所降低之外,其他性能都得到了显著改善,尤其是导热系数和抗碱性的提高,这对于提高高炉炭砖的质量有利的。

The graphitization mechanism of anthracites is addressed by studying the graphitization of 5 coals obtained from Ningxia, Shanxi, Guizhou, Yunnan and Viet Nam. The five graphitized anthracites are characterized by ultimate analysis and X - ray diffraction. The results show that anthracites can be graphtized by heat treatment at high temperatures, but graphtized anthracites are different from the artificial graphite. The properties of the graphitized anthracite are better than those electrically calcined and/or gas calcined anthracites in terms of lower ash content, sulfur content and specific resistance as well as higher real density. The properties of the carbon brick samples fabricated from the graphitized anthracites, especially the coefficient of heat transfer and the alkali resistance of the carbon bricks, have greatly improved except the compressive strength, which is of help to further improve the quality of the carbon bricks for blast furnace.