含釩鈦轉(zhuǎn)爐渣氧壓酸浸過程V-Ti-H2O系的電位-pH圖

摘要：為了分析含釩鈦轉(zhuǎn)爐渣氧壓酸浸過程的熱力學(xué)特點(diǎn),根據(jù)高溫水溶液中計算標(biāo)準(zhǔn)摩爾吉布斯自由能和活度系數(shù)的經(jīng)驗(yàn)公式,通過計算得到了氧分壓0.5 MPa、對應(yīng)離子的質(zhì)量濃度0.1 mol/kg、溫度60～200℃條件下V-Ti-H2O系的電位-pH圖.在pH＜2的酸性條件下,可溶性V3+,VO2+,VO2+的穩(wěn)定區(qū)幾乎全部包含在TiO2的穩(wěn)定區(qū)范圍內(nèi),隨著溫度由60℃升高到200℃,釩、鈦穩(wěn)定共存區(qū)對應(yīng)的氧化還原電位逐漸增大,pH逐漸降低.釩、鈦穩(wěn)定區(qū)的共存特點(diǎn)從熱力學(xué)角度為轉(zhuǎn)爐渣采用氧壓酸浸工藝通過一步酸浸將釩浸出的同時使鈦富集在渣中提供了理論依據(jù).含釩鈦轉(zhuǎn)爐渣的氧壓酸浸實(shí)驗(yàn)結(jié)果表明,在浸出溫度140℃、氧分壓0.5 MPa、粒度0.055～0.075mm、液固比15:1、浸出時間120m in、攪拌速度500r/min、初酸濃度200 g/L的條件下,釩的浸出率為96.87％,鈦的.浸出率為8.76％.釩與鈦通過氧壓酸浸工藝能夠得到有效分離,實(shí)驗(yàn)結(jié)果與熱力學(xué)計算結(jié)果一致.Abstract：To analyze the thermodynamic characteristics of leaching process of converter slag,(4)-pH diagram of V-Ti-H2O system at oxygen partial pressure of 0.5 MPa,ionic mass concentration of 0.1 mol/kg and temperatures ranging from 60 to 200 ℃ was obtained by recently published critically assessed standard Gibbs energies and activity coefficients of various species.When pH＜2,stable regions of V3+,VO2+ and VO2+ exist in the stable region of TiO2.The pH values of stable regions of vanadium and titanium decrease and redox potentials become more positive with the temperature increasing.Vanadium and titanium could be separated by one-step leaching based on thermodynamics.The experiment results of pressure acid leaching of converter slag show that leaching rates of vanadium and titanium are 96.87％ and 8.76％ respectively,at 140 ℃ of temperature,0.5 MPa of oxygen partial pressure,0.055-0.075mm of particle size,15:1 of liquid to solid ratio,120 min of leaching time,500 r/min of stirring speed and 200 g/L of initial acid concentration.Vanadium and titanium could be selectively separated in the pressure acid leaching process,and the experiment result is in agreement with thermodynamic calculation result. 作者： 牟望重  張延安  豆志河  呂國志  劉燕 Author： MU Wang-zhong  ZHANG Ting-an  DOU Zhi-he  L(U) Guo-zhi  LIU Yan 作者單位： 東北大學(xué)材料與冶金學(xué)院,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110819 期 刊： 中國有色金屬學(xué)報（英文版）   ISTICEISCI Journal： Transactions of Nonferrous Metals Society of China 年，卷(期)： 2011, 21(9) 分類號： X756 關(guān)鍵詞： 電位-pH圖    V-Ti-H2O系    氧壓酸浸    轉(zhuǎn)爐渣    釩    鈦    Keywords： (4)-pH diagram    V-Ti-H2O system    pressure acid leaching    converter slag    vanadium    titanium    機(jī)標(biāo)分類號： TF8 TD9 機(jī)標(biāo)關(guān)鍵詞： 釩鈦    轉(zhuǎn)爐渣    氧壓酸浸    過程    氧化還原電位    converter slag    acid leaching    oxygen partial pressure    leaching process    thermodynamic calculation    activity coefficients    浸出率    experiment    穩(wěn)定區(qū)    熱力學(xué)    mass concentration    酸浸工藝    實(shí)驗(yàn)結(jié)果    leaching rates    stable region 基金項(xiàng)目： the National Key Basic Research Program of China，the National Natural Science Foundation of China，National Science and Technology Support Plan of China during the 11th Five-Year Plan 含釩鈦轉(zhuǎn)爐渣氧壓酸浸過程V-Ti-H2O系的電位-pH圖[期刊論文]  中國有色金屬學(xué)報（英文版） --2011, 21(9)牟望重  張延安  豆志河  呂國志  劉燕為了分析含釩鈦轉(zhuǎn)爐渣氧壓酸浸過程的熱力學(xué)特點(diǎn),根據(jù)高溫水溶液中計算標(biāo)準(zhǔn)摩爾吉布斯自由能和活度系數(shù)的經(jīng)驗(yàn)公式,通過計算得到了氧分壓0.5 MPa、對應(yīng)離子的質(zhì)量濃度0.1 mol/kg、溫度60～200℃條件下V-Ti-H2O系的電位-pH圖...

【含釩鈦轉(zhuǎn)爐渣氧壓酸浸過程V-Ti-H2O系的電位-pH圖】相關(guān)文章：

赤泥酸浸回收鈦的實(shí)驗(yàn)研究11-01

含鈦高爐渣綜合利用與鈦組分析出技術(shù)的進(jìn)展07-30

釩鈦論文的致謝10-07

含F(xiàn)e鈦酸鋁固溶體粉體的合成06-12

酸的通性 pH值01-21

酸的通性 、pH 習(xí)題精選04-26

淺析攀枝花釩鈦磁鐵礦釩的分布規(guī)律07-14

從沸騰爐渣中浸取有價金屬01-17

鈦酸丁酯與乙酐的反應(yīng)和產(chǎn)物鈦氧有機(jī)化合物結(jié)構(gòu)分析11-03