(1. 东北大学 多金属共生矿生态化冶金教育部重点实验室，沈阳 110819；
2. 东北大学 冶金学院，沈阳 110819)
摘 要: 在提出“非高炉提铁-铝酸钙渣提铝”生态化高效利用新工艺的基础上，系统研究预还原温度、时间、钙铝比、碳氧比等对铁铝共生矿预还原过程中金属化率和矿相转变行为的影响。结果表明：矿石金属化率随预还原温度提高而明显增加；随着还原时间的延长和钙铝比的增加，金属化率均先增加后降低，还原时间和钙铝比分别在30 min和0.8时金属化率达到最高；提高碳氧比有利于提高金属化率，但提高幅度不大。预还原条件对预还原矿矿相的种类影响不大，在初期Fe、2CaO·Al2O3·SiO2、12CaO·7Al2O3、2CaO·SiO2和3CaO·Al2O3相均能生成，提高钙铝比、预还原温度和时间有利于促进2CaO·Al2O3·SiO2向12CaO·7Al2O3和2CaO·SiO2转化。预还原过程工艺条件推荐为：预还原温度1300 ℃，保温时间30 min，钙铝比0.8，碳氧比1.2，此时预还原矿金属化率为63.10%。
关键字: 铁铝共生资源；碳热还原；金属化率；铝酸钙；硅酸二钙
（1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral, Ministry of Education, Northeastern University, Shenyang 110819, China;
2. School of Metallurgy, Northeastern University, Shenyang 110819, China）
Abstract:The efficient utilization of iron-aluminum symbiotic resources is great significance to the healthy development of aluminum industry and iron and steel industry in China. Based on the new technology of “non-blast furnace to extract iron-calcium aluminate slag to extract aluminum”, the effects of pre-reduction temperature, time, C/A ratio, C/O ratio on the metallization rate and phase transformation behavior of iron-aluminum symbiotic ore in the pre-reduction process were systematically studied. The metallization rate of ore increases obviously with the increase of pre-reduction temperature; with the extension of reduction time and the increase of C/A ratio, the metallization rate first increases and then decreases, which reaches the maximum for 30 min and 0.8, respectively. The increase of C/O ratio is conducive to the increase of metallization rate, but the increase range is not obvious. The pre-reduction conditions have little effect on the phase types of pre-reduced ore. In the early stage, the phases of Fe, 2CaO·Al2O3·SiO2, 12CaO·7Al2O3, 2CaO·SiO2 and 3CaO·Al2O3 can be formed. Increasing the C/A ratio, the pre-reduction temperature and time can promote the transformation of 2CaO·Al2O3·SiO2 to 12CaO·7Al2O3 and 2CaO·SiO2. The recommended conditions of pre-reduction process are that the pre-reduction temperature is 1300 ℃, the holding time is 30 min, the C/A ratio is 0.8, the C/O ratio 1.2, and the metallization rate of pre-reduction ore is 63.10%.
Key words: iron-aluminum symbiotic resource; carbothermic reduction; metallization rate; calcium aluminate; dicalcium silicate
