摘要
为提高废加氢催化剂钠化焙烧-水浸分离工艺回收有价金属的效率,采用响应面法优化了废加氢催化剂钠化焙烧-水浸工艺条件,探讨了焙烧温度、焙烧时间、碳酸钠添加量、浸出温度和液固比对Mo、Al浸出率的影响,并确定了最优工艺条件;同时,采用热重-差示扫描量热法(TG-DSC)和X射线衍射法(XRD)分析了废催化剂预处理与钠化焙烧过程的物相变化。结果表明:适宜的预处理温度为400~500℃。随着预处理温度的升高,钼与铝结合生成Al_(2)(MoO_(4))_(3);Al_(2)(MoO_(4))_(3)可参与钠化反应。在钠化焙烧温度为950℃、焙烧时间为2 h、碳酸钠与废加氢催化剂质量比为1.1∶1、浸出液固比为6:1、浸出温度为70℃的条件下,Mo的浸出率可达98%以上、Al的浸出率可达94%以上。当碳酸钠添加量较少时,未参与钠化反应的Mo和Al会结合生成Al_(2)(MoO_(4))_(3),从而造成Mo、Al浸出率降低。Mo、Al发生钠化反应的温度在700~1000℃之间;当焙烧温度为700℃时,钠化反应未大量发生;随着反应温度的提高,钠化反应大量发生,至950℃时钠化反应最充分。本研究结果可为废加氢催化剂钠化焙烧-水浸分离回收有价金属提供参考。
The process conditions of sodium roasting and water extraction were optimized by response surface method during the recovery of valuable metals from spent hydrogenation catalyst.The effects of roasting temperature,roasting time,sodium carbonate adding amount,leaching temperature and liquid-solid ratio on the extraction rate of Mo and Al were examined,and the optimal process conditions were determined.TG-DSC and X-ray diffraction were used to analyze the phase transformation during pretreatment and sodium roasting of spent catalyst.The results showed that the suitable pretreatment temperature was located in the range of 400 and 500℃.With the increase of pretreatment temperature,Al_(2)(MoO_(4))_(3)can be formed by the combination of Mo and Al,while Al_(2)(MoO_(4))_(3)can still participate in the sodium reaction.The maxmium extraction ratios of Mo and Al of over 98%and 94%could be obtained when the mixture of sodium carbonate and spent hydrogenation catalyst with mass ratio of 1.1:1 was roasted at 950℃for 2 h,and was further extracted by water with the liquid-solid ratio of 6:1 at 70℃.Mo and Al combine and form Al_(2)(MoO_(4))_(3)with the introduction of slight sodium carbonate.The sodium reaction did not occur substantially at 700℃,while finish completely with the temperature rising to 950℃.This study provides technical and theoretical supporting for the sodium roasting and water extraction process of spent hydrogenation catalyst.
作者
安浩
曾曼
余浩然
张文艺
彭明国
毛林强
AN Hao;ZENG Man;YU Haoran;ZHANG Wenyi;PENG Mingguo;MAO Linqiang(China MCC5 Group Corp.LTD.,Chengdu 610000,China;School of Environmental&Safety Engineering,Changzhou University,Changzhou 213164,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2023年第1期259-267,共9页
Chinese Journal of Environmental Engineering
基金
中石化总公司科技计划资助项目(319005-7)。
关键词
废加氢催化剂
钠化焙烧-水浸
有价金属回收
响应面优化法
危险废物资源化
钼
spent hydrogenation catalyst
sodium roasting-water leaching
recovery of valuable metals
response surface optimization
hazardous waste recycling
molybdenum
