CAJ | 학술논문

采用“核收缩”模型研究了湖北某地含钒石煤硫酸浸出过程中钒、铝的浸出动力学。结果表明，钒的浸出动力学过程与钒的转价有密切关系：在25～45℃条件下，浸出初期，钒的浸出以五价钒及颗粒表面四价钒为主，受化学反应控制，表观反应活化能为36 kJ／mol；浸出后期，反应界面向颗粒内部推移，钒的浸出转化为内扩散控制，以四价钒为主，表观反应活化能升高为64 kJ／mol。在55～95℃条件下，三价钒亦被活化，钒的浸出过程受内扩散控制，表观反应活化能最高，为91 kJ／mol。铝由于赋存状态单一，始终受晶格束缚，其浸出动力学过程受内扩散控制，表观反应活化能较高，为68 kJ／mol。钒、铝浸出均为二级反应，对硫酸浓度依赖性较大。
채용“핵수축”모형연구료호북모지함범석매류산침출과정중범、려적침출동역학。결과표명，범적침출동역학과정여범적전개유밀절관계：재25～45℃조건하，침출초기，범적침출이오개범급과립표면사개범위주，수화학반응공제，표관반응활화능위36 kJ／mol；침출후기，반응계면향과립내부추이，범적침출전화위내확산공제，이사개범위주，표관반응활화능승고위64 kJ／mol。재55～95℃조건하，삼개범역피활화，범적침출과정수내확산공제，표관반응활화능최고，위91 kJ／mol。려유우부존상태단일，시종수정격속박，기침출동역학과정수내확산공제，표관반응활화능교고，위68 kJ／mol。범、려침출균위이급반응，대류산농도의뢰성교대。
The kinetics on leaching of vanadium and aluminum using sulfuric acid from the vanadium‐bearing stone coal was investigated by shrinking core model .The results indicate that the leaching kinetics of vanadium interrelate with the valence of vanadium .At 25 -45 ℃ ,the leaching process of vanadium is controlled by chemical reaction with the apparent activation energy of 36 kJ/mol ,and the vanadium leached mainly consist of V (Ⅴ ) and V (Ⅳ ) on the particle surface at the initial leaching stage .At the late leaching stage ,the reaction boundary moves into the inside of particles ,and the leaching process of vanadium which is mainly V (Ⅳ ) is controlled by internal diffusion with the apparent activation energy of 63 kJ/mol .At 55-95 ℃ ,V(Ⅲ) is activated and the leaching process of vanadium is controlled by the internal diffusion with the apparent activation energy of 91 kJ/mol .The leaching process of aluminum is controlled by the internal diffusion because it only occurs in lattice bound ,with the apparent reaction activation energy of 68 kJ/mol .The leaching rate of vanadium and aluminum rely on greatly the sulfuric acid concentration and their leaching processes both are second‐order reaction .