(1. 東北大學(xué) 多金屬共生礦生態(tài)化冶金教育部重點(diǎn)實驗室，沈陽 110819；
2. 東北大學(xué) 冶金學(xué)院，沈陽 110819)
摘 要: 在提出“非高爐提鐵-鋁酸鈣渣提鋁”生態(tài)化高效利用新工藝的基礎(chǔ)上，系統(tǒng)研究預(yù)還原溫度、時間、鈣鋁比、碳氧比等對鐵鋁共生礦預(yù)還原過程中金屬化率和礦相轉(zhuǎn)變行為的影響。結(jié)果表明：礦石金屬化率隨預(yù)還原溫度提高而明顯增加；隨著還原時間的延長和鈣鋁比的增加，金屬化率均先增加后降低，還原時間和鈣鋁比分別在30 min和0.8時金屬化率達(dá)到最高；提高碳氧比有利于提高金屬化率，但提高幅度不大。預(yù)還原條件對預(yù)還原礦礦相的種類影響不大，在初期Fe、2CaO·Al2O3·SiO2、12CaO·7Al2O3、2CaO·SiO2和3CaO·Al2O3相均能生成，提高鈣鋁比、預(yù)還原溫度和時間有利于促進(jìn)2CaO·Al2O3·SiO2向12CaO·7Al2O3和2CaO·SiO2轉(zhuǎn)化。預(yù)還原過程工藝條件推薦為：預(yù)還原溫度1300 ℃，保溫時間30 min，鈣鋁比0.8，碳氧比1.2，此時預(yù)還原礦金屬化率為63.10%。
關(guān)鍵字: 鐵鋁共生資源；碳熱還原；金屬化率；鋁酸鈣；硅酸二鈣
（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
