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含釩鈦轉爐渣氧壓酸浸過程V-Ti-H2O系的電位-pH圖
摘要：為了分析含釩鈦轉爐渣氧壓酸浸過程的熱力學特點,根據高溫水溶液中計算標準摩爾吉布斯自由能和活度系數的經驗公式,通過計算得到了氧分壓0.5 MPa、對應離子的質量濃度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,隨著溫度由60℃升高到200℃,釩、鈦穩(wěn)定共存區(qū)對應的氧化還原電位逐漸增大,pH逐漸降低.釩、鈦穩(wěn)定區(qū)的共存特點從熱力學角度為轉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.含釩鈦轉爐渣的氧壓酸浸實驗結果表明,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,實驗結果與熱力學計算結果一致.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： 東北大學材料與冶金學院,多金屬共生礦生態(tài)化利用教育部重點實驗室,沈陽110819 期 刊： 中國有色金屬學報（英文版） ISTICEISCI Journal： Transactions of Nonferrous Metals Society of China 年，卷(期)： 2011, 21(9) 分類號： X756 關鍵詞： 電位-pH圖 V-Ti-H2O系 氧壓酸浸 轉爐渣 釩 鈦 Keywords： (4)-pH diagram V-Ti-H2O system pressure acid leaching converter slag vanadium titanium 機標分類號： TF8 TD9 機標關鍵詞： 釩鈦 轉爐渣 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 mass concentration 酸浸工藝 實驗結果 leaching rates stable region 基金項目： 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爐渣氧壓酸浸過程的熱力學特點,根據高溫水溶液中計算標準摩爾吉布斯自由能和活度系數的經驗公式,通過計算得到了氧分壓0.5 MPa、對應離子的質量濃度0.1 mol/kg、溫度60～200℃條件下V-Ti-H2O系的電位-pH圖...【含釩鈦轉爐渣氧壓酸浸過程V-Ti-H2O系的電位-pH圖】相關文章：
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