(中國科學(xué)院過程工程研究所 綠色過程與工程重點(diǎn)實(shí)驗(yàn)室，
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: 以釩渣亞熔鹽法釩鉻共提工藝所得到的中間產(chǎn)品釩酸鈣為研究對象，針對釩酸鈣后續(xù)產(chǎn)品轉(zhuǎn)化問題，提出釩酸鈣碳化銨化生產(chǎn)釩氧化物的工藝路線；研究NH4HCO3轉(zhuǎn)化溶出釩的工藝條件，考察是否通入CO2、NH4HCO3的添加量、反應(yīng)溫度、不同液固比以及反應(yīng)時(shí)間等對釩酸鈣轉(zhuǎn)化溶出效果的影響。結(jié)果表明：釩酸鈣碳化銨化反應(yīng)的最佳條件為反應(yīng)溫度75 ℃，液固比20:1，通入CO2，且流速1.5 L/min，銨釩摩爾比1.0，反應(yīng)時(shí)間1 h，此條件下釩酸鈣中釩轉(zhuǎn)化率為97.35%。
關(guān)鍵字: 釩渣；亞熔鹽；釩酸鈣；碳化銨化；碳酸氫銨
（National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Key Laboratory for Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China）
Abstract:A new process which transforms calcium vanadate, the intermediate product during the previous vanadium-chromium co-extraction by vanadium slag sub-molten salt roasting process, to vanadium oxide using carbonization-ammonium method was proposed. The subsequent transformation of calcium vanadate and the vanadium extraction using NH4HCO3 as reactant was studied. The effects of CO2, NH4+-V mole ratio, liquid-solid ratio and reaction time were investigated. By controlling the reaction temperature at 75 ℃, liquid-solid ratio of 20, CO2 flow rate of 1.5 L/min, NH4+-V mole ratio of 1 and reaction time of 1 h, the optimal process conditions are obtained, which make the vanadium conversion from calcium vanadate reach 97.35%.
Key words: vanadium slug; sub-molten salt; calcium vanadate; carbonization-ammonium process; ammonium bicarbonate
