(1. 昆明理工大學(xué) 國土資源工程學(xué)院，昆明 650093；
2. 中國科學(xué)院 過程工程研究所 濕法冶金清潔生產(chǎn)技術(shù)國家工程實(shí)驗(yàn)室，北京100190)
摘 要: 針對(duì)鉻鹽無鈣焙燒工藝浸出液除釩現(xiàn)行鈣鹽沉釩法鈣鹽加入量大、需反復(fù)調(diào)節(jié)pH值、脫釩渣含鉻酸鈣等問題，提出采用鐵鹽作為沉釩劑進(jìn)行除釩。考察鐵鹽加入量、pH值和溫度等主要因素對(duì)釩脫除的影響，得到了最佳工藝條件，且終液釩濃度低于0.08 g/L，滿足后續(xù)工藝要求。鐵鹽除釩可在較寬的pH值范圍內(nèi)操作，不需反復(fù)調(diào)節(jié)溶液pH值。渣相分析表明：脫釩渣為吸附釩酸根的氫氧化鐵，其中不含鉻，進(jìn)一步探討氫氧化鐵對(duì)釩的吸附機(jī)理，確定釩酸根通過內(nèi)層絡(luò)合方式吸附在氫氧化鐵表面。
關(guān)鍵字: 鉻酸鈉；除釩；無鈣焙燒；氫氧化鐵；吸附
（1. Faculty of Land and Resource, Kunming University of Science and Technology, Kunming 650093, China;
2. Key Laboratory of Green Process and Engineering, Institute of Process Engineering,
Chinese Academy of Science, Beijing 100190, China）
Abstract:According to the current existing problem in the vanadium precipitating process in calcium salt by non-calcium roasting technology with chromium salt, such problems as large amount of calcium salt, repeatedly adjusting the pH value, slag containing calcium chromate and other issues, iron salts were used as precipitating agent to remove vanadium. The amount of iron salt added, pH value, temperature and other major factors on the impact of vanadium removal were investigated, the optimum conditions are that the vanadium concentration in final liquid is less than 0.08 g/L, which satisfies the follow-up process requirements. Utilizing iron salt to remove vanadium can be operated in wide pH range, without repeatedly adjusting the pH value. By analyzing, the slag phase is ferric hydroxide, which adsorbs vanadium, containing no chromium. And by further exploring against adsorption mechanism, vanadium is adsorbed on the surface of the iron hydroxide by inner layer complexation.
Key words: sodium chromate; vanadium removal; non-calcium roasting; ferric hydroxide; adsorption
