(1. 東北大學(xué) 冶金學(xué)院，沈陽(yáng) 110819； 2. 東北大學(xué) 多金屬共生礦生態(tài)化利用教育部重點(diǎn)實(shí)驗(yàn)室，沈陽(yáng) 110819； 3. 攀鋼集團(tuán) 西昌鋼釩有限公司，西昌 615012)
摘 要: 采用X射線衍射、掃描電鏡及能譜分析對(duì)釩渣鈣化焙燒相變機(jī)理進(jìn)行研究。結(jié)果表明：釩渣主要物相為不規(guī)則多邊形鐵釩尖晶石和鐵橄欖石，660 ℃時(shí)均已開始氧化分解，前者產(chǎn)物為固溶體R2O3和部分鐵板鈦礦微晶聚體及晶間少量釩酸錳，鐵橄欖石740 ℃時(shí)已顯著分解、結(jié)構(gòu)破壞。隨著溫度的提高(660~900 ℃)，氧化產(chǎn)物逐漸增多，微晶粒長(zhǎng)大聚合，釩酸鹽形態(tài)由少量浸染狀逐漸向微質(zhì)點(diǎn)、無定形熔態(tài)帶狀變化，并向渣粒外側(cè)遷移。低于900 ℃時(shí)，釩酸鹽中Mn含量較高，Ca含量偏低，實(shí)際生成的為釩酸錳鹽；900 ℃以上時(shí)，Mn和Ca含量則逆向變化，形成焦釩酸鈣；940 ℃時(shí)，渣粒出現(xiàn)液相，使部分焦釩酸鈣與R2O3和玻璃相混雜，阻礙氧化反應(yīng)。
關(guān)鍵字: 釩渣；鈣化焙燒；相變；釩酸錳；釩酸鈣
（1. School of Metallurgy, Northeastern University, Shenyang 110819, China; 2. Key Laboratory for Ecological Utilization of Multimetallic Mineral, Ministry of Education, Northeastern University, Shenyang 110819, China; 3. Xichang Iron and Steel Co., Ltd., Pangang Group, Xichan 615012, China）
Abstract:The mechanism of phase transformations in calcified roasting vanadium slag was studied by XRD, SEM and EDS analyses. The results indicate that the major phases in the vanadium slag are irregular and polygonal iron-vanadium spinel and fayalite, both of which have been the beginning of oxidation decomposition at 660 ℃. The decomposition products of the former are the micro crystalline aggregate of solid solution R2O3 and partial pseudobrookite with small amount of manganese vanadium distributing on the micro crystalline boundary. Fayalite is evidently decomposed at 740 ℃, resulting in its structure failure. With the temperature (660-900 ℃) raising, the oxidation products gradually increase, and the micro crystallines grow and aggregate. Also, the vanadate transforms in morphology from a small amount of dissemination to micro particles and to amorphous and molten zone, which migrates to the outside of the slag particles in the meantime. Below 900 ℃, Mn content in the vanadate is higher and Ca content is lower, indicating that it is manganese vanadate. Above 900 ℃, the contents of Mn and Ca in the vanadate vary reversely, indicating that the calcium pyrovanadate forms. The liquid phase occurs in slag particles at 940 ℃, which results in mixing the partial calcium pyrovanadate with R2O3 and glass phase to hinder the oxidation reaction.
Key words: vanadium slag; calcified roasting; phase transformation; manganese vanadate; calcium pyrovanadate
