| 韩雪,秦伟,王钧伟,张建利,翁雅青.废FCC催化剂中稀土元素的浸出及动力学分析[J].井冈山大学自然版,2023,44(1):32-39 |
| 废FCC催化剂中稀土元素的浸出及动力学分析 |
| LEACHING AND KINETIC STUDY OF RARE EARTH ELEMENTS FROM WASTE FCC CATALYSTS |
| 投稿时间：2022-05-17 修订日期：2022-08-16 |
| DOI：10.3969/j.issn.1674-8085.2023.01.006 |
| 中文关键词: 废FCC催化剂 稀土 浸出 动力学分析 资源回收 |
| 英文关键词: waste FCC catalyst rare earth leaching kinetic analysis resource recovery |
| 基金项目:国家自然科学基金项目（51404014）；安徽省高校自然科学研究重点项目（KJ2020A0494）；省部共建煤炭高校利用与绿色化工国家重点实验室开放课题（2019-KF-31，2020-KF-28） |
| 作者 | 单位 | E-mail | | 韩雪 | 安庆师范大学化学化工学院, 安徽, 安庆 246133 | | | 秦伟 | 安庆师范大学化学化工学院, 安徽, 安庆 246133 | laviniaqin@163.com | | 王钧伟 | 安庆师范大学化学化工学院, 安徽, 安庆 246133 | | | 张建利 | 宁夏大学省部共建煤炭高校利用与绿色化工国家重点实验室, 宁夏, 银川 750021 | | | 翁雅青 | 江西省科学院, 江西, 南昌 330029 | |
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| 中文摘要: |
| 针对FCC废催化剂中所含的稀土元素，本研究以废FCC催化剂为原料，与无水碳酸钠混合焙烧活化，以盐酸为浸出剂，探究了盐酸浓度、浸出温度、浸出时间、浸出固液比以及焙烧时间等因素对FCC废催化剂中稀土元素镧(La)、铈(Ce)的浸出率的影响，并进行了浸出过程动力学分析和表观活化能计算。实验结果表明：废FCC催化剂在750℃条件下和碳酸钠以质量比为1:1混合焙烧300 min后，在70℃的条件下，用6 mol/L的盐酸溶液且固液比为1:25浸出120 min时，La、Ce最佳浸出率可达到88.06%、90.07%；FCC废催化剂浸出前后SEM和XRD测试分析表明废FCC在酸浸后衍射特征峰基本消失，晶格结构被破坏，浸出渣主要为SiO2；缩芯模型浸出过程动力学分析和Avrami表观活化能计算结果均表明：La和Ce的浸出活化能的测定值分别为27.1、21.2 KJ/mol，该浸出过程受扩散控制。该研究对固废资源中稀土元素的高效回收具有一定的指导意义。 |
| 英文摘要: |
| In this paper, we investigated the effects of hydrochloric acid concentration, leaching temperature, leaching time, leaching solid-liquid ratio and roasting time on the leaching rates of lanthanum (La) and cerium (Ce) of rare earth elements in FCC waste catalysts by using waste FCC catalysts as raw materials, mixed with anhydrous sodium carbonate for roasting activation and hydrochloric acid as leaching agent, and carried out kinetic analysis of leaching process and apparent activation energy calculation. The results showed that the optimum leaching rates of lanthanum and cerium could reach 88.06% and 90.07%, respectively, when the waste FCC was roasted with sodium carbonate at a mass ratio of 1:1 for 300 min at 750 ℃, and then leached with 6 mol/L hydrochloric acid solution at a solid-liquid ratio of 1:25 for 120 min at 70 ℃; The SEM and XRD tests before and after the leaching of waste FCC catalysts showed that the characteristic peaks of FCC diffraction basically disappeared after acid leaching, the lattice structure was destroyed, and the leaching residue was mainly SiO2. Both the kinetic analysis of the leaching process with the shrinking core model and the calculation of the apparent activation energy of Avrami showed that the leaching activation energies of La and Ce were 27.1 and 21.2 KJ/mol, respectively, and the leaching process was controlled by diffusion. This study has some guiding significance for the efficient recovery of rare earth elements from solid waste resources. |
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