论文部分内容阅读
在综合国内外研究成果的基础上 ,分析了现代工艺条件下预焙铝电解槽的破损原因 ,并提出了延长槽寿命的对策。现行电解槽由于采用低分子比电解质 ,电流效率显著提高 ,但同时由于在电解槽内容易形成界面冰晶石薄膜及氧化铝沉淀 ,使得钠的析出显著增加 ,增强了钠对阴极碳块的渗透 ,从而导致阴极碳块膨胀破损的机率增加 ,为此 ,必须改善电解槽阴极内衬材料以延长电解槽寿命。采用半石墨化或石墨 (化 )阴极内衬 ,或在普通碳块上增加TiB2 涂层 ,可以实现上述目的。半石墨化或石墨化阴极内衬具有较好的抗钠膨胀性能 ,但由于石墨质软 ,机械磨损大且成本高 ,而TiB2 涂层碳块阴极内衬既具有优良的抗钠膨胀和对铝润湿性能 ,又有良好的耐磨性 ,有很好的发展前景
On the basis of the domestic and foreign research results, the reasons for the damage of the prebaked aluminum reduction cell under the condition of modern technology are analyzed, and the countermeasures for extending the life of the cell are put forward. The current electrolyzer uses low molecular weight electrolytes, the current efficiency is significantly improved, but at the same time due to the formation of the interface in the cell easy to form an interface cryolite film and alumina precipitation, making the precipitation of sodium increased significantly increased sodium penetration of the cathode carbon block, Resulting in an increase in the probability of damage to the cathode carbon block. Therefore, it is necessary to improve the cell cathode lining material to prolong the life of the cell. This can be achieved by using semi-graphitized or graphitized cathode liners, or by adding TiB2 coatings on common carbon blocks. Semi-graphitized or graphitized cathode liners have better sodium swell resistance, but due to the soft graphite, large mechanical wear and high cost, TiB2-coated carbon block cathode liners have both excellent resistance to sodium swelling and to aluminum Wetting properties, but also a good wear resistance, have good prospects for development