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以云南某铜冶炼厂电炉贫化渣为原料,在有氧气氛下加入CaO高温焙烧铜渣,分析了焙烧时间、焙烧温度、铜渣粒度、气相气氛对磁化焙烧效果的影响,利用SEM和XRD等对焙烧样品的微观形貌、物相变化进行分析,并通过热重分析考察了添加CaO及研磨粒度对铜渣焙烧过程的影响.结果表明,加入CaO能有效促进Fe2SiO4分解,磨矿越细越有利于反应进行,随焙烧温度提高、焙烧时间延长,α-Fe2O3增多,而Fe3O4先增加、温度超过850℃后减少;过高温度及过长焙烧时间不利于Fe3O4富集,且过低的氧势不利于富集Fe3O4的气固反应进行,Fe3O4富集的优化条件为空气气氛下850℃焙烧2h.
Taking a copper smelting furnace in Yunnan Province as a raw material, the slag was calcined at high temperature in the presence of oxygen. The effects of roasting time, calcination temperature, copper slag size and gas phase atmosphere on the magnetization roasting were analyzed. SEM and XRD The effects of adding CaO and grinding particle size on the copper roasting process were investigated by TG analysis.The results showed that the addition of CaO can effectively promote the decomposition of Fe2SiO4 and the finer grinding The better the reaction, the longer the calcination time is, the longer the calcination time is, the more α-Fe2O3 is added, while the more the Fe3O4 content is and the more the temperature is lower than 850 ℃. The excessively high temperature and long calcination time are unfavorable for Fe3O4 enrichment, The oxygen potential is not conducive to the gas-solid reaction enrichment of Fe3O4, and the optimal conditions for the enrichment of Fe3O4 are calcined at 850 ℃ for 2h under air atmosphere.