CAJ | 학술논문

为了分析含钒钛转炉渣氧压酸浸过程的热力学特点,根据高温水溶液中计算标准摩尔吉布斯自由能和活度系数的经验公式,通过计算得到了氧分压0.5 MPa、对应离子的质量浓度0.1 mol/kg、温度60～200℃条件下V-Ti-H2O系的电位-pH图.在pH＜2的酸性条件下,可溶性V3+,VO2+,VO2+的稳定区几乎全部包含在TiO2的稳定区范围内,随着温度由60℃升高到200℃,钒、钛稳定共存区对应的氧化还原电位逐渐增大,pH逐渐降低.钒、钛稳定区的共存特点从热力学角度为转炉渣采用氧压酸浸工艺通过一步酸浸将钒浸出的同时使钛富集在渣中提供了理论依据.含钒钛转炉渣的氧压酸浸实验结果表明,在浸出温度140℃、氧分压0.5 MPa、粒度0.055～0.075mm、液固比15:1、浸出时间120m in、搅拌速度500r/min、初酸浓度200 g/L的条件下,钒的浸出率为96.87％,钛的浸出率为8.76％.钒与钛通过氧压酸浸工艺能够得到有效分离,实验结果与热力学计算结果一致.
위료분석함범태전로사양압산침과정적열역학특점,근거고온수용액중계산표준마이길포사자유능화활도계수적경험공식,통과계산득도료양분압0.5 MPa、대응리자적질량농도0.1 mol/kg、온도60～200℃조건하V-Ti-H2O계적전위-pH도.재pH＜2적산성조건하,가용성V3+,VO2+,VO2+적은정구궤호전부포함재TiO2적은정구범위내,수착온도유60℃승고도200℃,범、태은정공존구대응적양화환원전위축점증대,pH축점강저.범、태은정구적공존특점종열역학각도위전로사채용양압산침공예통과일보산침장범침출적동시사태부집재사중제공료이론의거.함범태전로사적양압산침실험결과표명,재침출온도140℃、양분압0.5 MPa、립도0.055～0.075mm、액고비15:1、침출시간120m in、교반속도500r/min、초산농도200 g/L적조건하,범적침출솔위96.87％,태적침출솔위8.76％.범여태통과양압산침공예능구득도유효분리,실험결과여열역학계산결과일치.
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.