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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第10期    总第290期    2018年10月

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文章编号:1672-7207(2018)10-2373-08
大洋锰结核与药渣共浸出氧化还原过程研究
仇云飞1,冯雅丽1,李浩然2,杜竹玮2,康金星1,王昌1

(1. 北京科技大学 土木与资源工程学院,北京,100083;
2. 中国科学院 过程工程研究所,生化工程国家重点实验室,北京,100190
)

摘 要: 以药渣为大洋锰结核还原剂,研究药渣湿法还原锰结核浸出特性。考察搅拌速率、液固比、硫酸浓度、药渣用量和反应温度对锰浸出的影响,利用稳态极化曲线测定浸出反应动力学参数。研究结果表明:在搅拌速率为400 r/min、液固比为10:1、硫酸浓度为0.94 mol/L、药渣用量为5 g、浸出温度为363 K的条件下浸出300 min,锰浸出率达95.78%。在343~368 K间,浸出过程受化学反应控制,表观活化能为40.74 kJ/mol。在酸性环境下,锰结核与药渣有机物聚团接触碰撞,大分子聚团被锰氧化物氧化为水溶性小分子后,小分子水溶性有机物经腐蚀凹孔进入结核内层,进而氧化成NH4+,H2O和CO2,锰结核由外向内逐层腐蚀;反应过程中锰氧化物晶格破坏,释放Cu,Co和Ni等有价金属元素。

 

关键字: 药渣;大洋锰结核;动力学分析;塔菲尔曲线

Oxidation-reduction process of oceanic manganese nodules and pharmaceutical residue
QIU Yunfei1, FENG Yali1, LI Haoran2, DU Zhuwei2, KANG Jinxing1, WANG Chang1

1. School of Civil and Resources Engineering, University of Science & Technology Beijing, Beijing 100083, China;
2. State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

Abstract:The reductive leaching of manganese from oceanic manganese nodules was investigated by using pharmaceutical residue as reducing agent. The effects of stirring speed, liquid/solid ratio, sulfuric acid concentration, dosage of pharmaceutical residue and reaction temperature on the manganese extraction were examined. The results show that the leaching efficiency of manganese peaks at 95.78% under the optimal conditions: stirring speed of 400 r/min, liquid/solid ratio of 10:1, sulfuric acid concentration of 0.94 mol/L, pharmaceutical residue dosage of 5 g, and temperature of 363 K for 300 min. At 343-368 K, the kinetic analysis is carried out based on the shrinking core model, which shows that the reductive leaching process is controlled by the chemical reaction, and the apparent activation energy is 40.74 kJ/mol. In acidic solution, with contacting and collision between oceanic manganese nodules and pharmaceutical residue, macromolecular organics is decomposed into water-soluble small molecules and finally into NH4+, H2O and CO2. Manganese nodules are reduced and dissolved by small organic molecules that contact with manganese nodules inner layer through groove by layer. Moreover, Cu, Co and Ni are released with the lattice of manganese oxides being destroyed.

 

Key words: pharmaceutical residue; oceanic manganese nodules; kinetic study; Tafel curve

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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