CAJ | 학술논문

为探索提高石煤中钒的浸出效率,以湖北通山某石煤矿石为研究对象,进行了石煤焙烧—加压酸浸提钒工艺研究. 结果表明:在焙烧温度为850 ℃、焙烧时间为60 min、釜内压力为1. 0 MPa、硫酸初始浓度为15%、液固比为1. 5 mL/g、浸出温度为150 ℃、浸出时间为120 min条件下,钒浸出率可达80. 51%. 采用红外光谱法分析了加压浸出前后云母矿物的晶体结构,并从动力学的角度揭示了浸出温度对钒浸出的影响机理. 结果表明:加压浸出可以破坏云母晶格,进而有利于释放云母晶格中的钒,提高钒浸出效果. 浸出过程动力学分析结果表明:浸出温度对浸出过程影响显著,浸出温度为60~120 ℃时,表观活化能为41. 603 kJ/mol,浸出过程受化学反应控制;150~210 ℃时,表观活化能为4. 319 kJ/mol,浸出过程受内扩散控制;加压浸出能够将浸出温度提高至100 ℃以上,有效提高了硫酸破坏云母晶格的速率,是提高钒浸出效率的关键.
위탐색제고석매중범적침출효솔,이호북통산모석매광석위연구대상,진행료석매배소—가압산침제범공예연구. 결과표명:재배소온도위850 ℃、배소시간위60 min、부내압력위1. 0 MPa、류산초시농도위15%、액고비위1. 5 mL/g、침출온도위150 ℃、침출시간위120 min조건하,범침출솔가체80. 51%. 채용홍외광보법분석료가압침출전후운모광물적정체결구,병종동역학적각도게시료침출온도대범침출적영향궤리. 결과표명:가압침출가이파배운모정격,진이유리우석방운모정격중적범,제고범침출효과. 침출과정동역학분석결과표명:침출온도대침출과정영향현저,침출온도위60~120 ℃시,표관활화능위41. 603 kJ/mol,침출과정수화학반응공제;150~210 ℃시,표관활화능위4. 319 kJ/mol,침출과정수내확산공제;가압침출능구장침출온도제고지100 ℃이상,유효제고료류산파배운모정격적속솔,시제고범침출효솔적관건.
In order to find a process which could increase the leaching velocity of vanadium,roasting-pressure acid leac-hing of vanadium on stone coal from Tongshan in Hubei was investigated. Results showed that,the optimal operation conditions are as followed:the roasting temperature was 850 ℃,the roasting time was 60 min,the kettle pressure was 1. 0 MPa,initial concentration of sulfuric acid was 15%,ratio of liquid to solid was 1. 5 mL/g,leaching temperature was 150 ℃ and leaching time was 120 min,with these conditions the vanadium leaching rate could reach 80. 51%. The changes of mica mineral struc-ture during leaching process were analyzed by Infrared Spectrometry analysis and the effect of temperature on vanadium effi-ciency was studied from the aspect of leaching kinetics. The results indicated that pressure acid leaching could destruct the crystal lattice of mica that was helpful for the release of vanadium and the increase of vanadium leaching efficiency. The leac-hing kinetics analysis results indicated that:effect of leaching temperature on vanadium efficiency was conspicuous,when the leaching temperature ranged from 60 to 120 ℃,the apparent activation energy was 41. 603 kJ/mol and the leaching was con-trolled by surface chemical reaction. When the temperature ranged from 150 to 210 ℃, the apparent activation energy was 4. 319 kJ/mol and the leaching was controlled by inner diffusion of reactants. As pressure acid leaching could raise the leac-hing temperature over 100 ℃,the destruction velocity of mica crystal lattice could be raised effectively and the vanadium leac-hing time could be shorten effectively.