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Enhancing leaching efficiency of ion adsorption rare earths by ameliorating mass transfer effect of rare earth ions by applying an electric field

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Journal of Rare Earths 2024年第1期42卷 172-180,I0006页

作者： Lingbo Zhou Jie Yang Shijie Kang Xiaojun wang Hongdong Yu yinhua wan Rare Earth Institute University of Science and Technology of ChinaHefei230000China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou341000China Jiangxi Institute of Rare Earths Chinese Academy of SciencesGanzhou341000China School of Resources and Environment Engineering Jiangxi University of Science and TechnologyGanzhou341000China

Improving the seepage of leaching solution in the ore body and strengthening the mass transfer process of rare earth ions during in-situ leaching are two critical methods to improve the leaching efficiency of rare *** this study,2 wt%MgSO_(4)solution was used for the indoor simulated column leaching experiment on rare earth samples and an electric field was applied at both ends of the *** the effects of different intensities,initial application time and duration of the electric field on the rare earth leaching system and its mechanism were *** results show that compared with the single MgSO_(4)solution leaching,applying an electric field with a strength of 6 V/cm can save the leaching time of 30 min and increase the flow velocity of the rare earth leachate by 26.98%.Under the optimal conditions of applying an electric field with a strength of 6 V/cm for 20 min to the leaching system after10 min of the rare earth leachate flowing out,the leaching efficiency of sample increases from 81.20% to 86.05% with the increase of 4.85%.The mechanism analysis shows that when a direct current electric field is applied to the rare earth leaching system,rare earth ions rapidly change from disorderly movement with the seepage into faster and directional *** addition,the seepage of the leaching solution is also improved due to the increase of the cross-sectional area of the seepage channel,the polarized water molecules migrate directionally by force from the negative pole,and the movement of the hydrogen is generated by the electrolytic *** impo rtantly,based on the principle of in-situ leaching process,the layout of injection holes and deflector holes in this process provides a natural site for the electrode layout of the electric *** the simple equipme nt and the ope ration,the rare earth leaching process with the applied electric field has high feasibility in industrial application.

关键词： Ion adsorption rare earths Leaching system Electric field Mass transfer process Seepage

Green production of sugar by membrane technology:How far is it from industrialization?

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Green Chemical Engineering 2021年第1期2卷 27-43页

作者： Hao Zhang Jianquan Luo Lulu Liu Xiangrong Chen yinhua wan State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing100049China

Application of membrane filtration in sugar production is attractive because it can reduce the usage of chemicals,produce high-quality clarified juice,and obtain various high value-added ***,some technical problems,such as insufficient membrane performance,high sucrose loss in membrane retentate,severe membrane fouling,and incomplete cleaning protocols,limit its industrial *** order to facilitate the development of membrane technology for sugar production,this review summarizes recent progress on the applications of membrane filtration in different stages of sugar production as well as the integrated membrane processes for various ***,some important issues including membrane fouling,membrane cleaning,economic feasibility and engineering problems of the membrane-based sugar production process are ***,the existing challenges and future research prospects for the industrialization of this green technique are pointed out.

关键词： Sugar production Molasses Membrane fouling Chemical cleaning Industrialization

Recent development of ionic liquid membranes

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Green Energy & Environment 2016年第1期1卷 43-61页

作者： Junfeng wang Jianquan Luo Shicao Feng Haoran Li yinhua wan Xiangping Zhang State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of Sciences

The interest in ionic liquids(IL) is motivated by its unique properties, such as negligible vapor pressure, thermal stability, wide electrochemical stability window, and tunability of properties. ILs have been highlighted as solvents for liquid-liquid extraction and liquid membrane separation. To further expand its application in separation field, the ionic liquid membranes(ILMs) and its separation technology have been proposed and developed rapidly. This paper is to give a comprehensive overview on the recent applications of ILMs for the separation of various compounds, including organic compounds, mixed gases, and metal ions. Firstly, ILMs was classified into supported ionic liquid membranes(SILMs) and quasi-solidified ionic liquid membranes(QSILMs) according to the immobilization method of ILs. Then, preparation methods of ILMs, membrane stability as well as applications of ILMs in the separation of various mixtures were reviewed. Followed this, transport mechanisms of gaseous mixtures and organic compounds were elucidated in order to better understand the separation process of ILMs. This tutorial review intends to not only offer an overview on the development of ILMs but also provide a guide for ILMs preparations and applications.

关键词： Ionic liquid membrane Supported ionic liquid membrane Qusai-solidified ionic liquid membrane Stability Application

Inhibitory effect of vanillin on cellulase activity in hydrolysis of cellulosic biomass

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Inhibitory effect of vanillin on cellulase activity in hydro...

中国生物工程学会2014年学术年会暨全国生物技术大会

作者： Yun Li Benkun Qi yinhua wan State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of Sciences University of Chinese Academy of Sciences

Researches on bioconversion of lignocellulosic materials for biofuel production have attracted great attention all over the world due to both the abundance of cheap and renewable cellulosic biomass and the consumption of nonrenewable fossil fuels. However, the current bioconversion process is still not commercially viable and cost-competitive in great part due to the recalcitrance of cellulosic biomass. It has been believed that the presence of lignin in lignocelluloses contributes greatly to the recalcitrance. On one hand, with tight association with cellulose and hemicellulose, lignin acts as a barrier to prevent the access of cellulolytic enzymes to the substrate;on the other hand, lignin unproductively absorbs cellulase, decreasing the amount of available cellulase for hydrolyzing. In order to reduce the recalcitrance of lignocellulosic biomass, biomass-disrupting pretreatment is required prior to enzymatic hydrolysis. Most of the prevalent pretreatments, however, are performed under severe conditions, resulting in formation of phenolic compounds from degradation of lignin. These phenolic compounds identified in lignocellulosic hydrolyzates include simple phenolics(vanillin, ferulic acid, syringaldehyde and conifer alcohol, etc.) and oligomeric phenolics(ellagia acid, epicatechin and tannic acid, etc.). The amount and type of phenolic compounds depend on the biomass source, pretreatment methods and conditions. The inhibition of lignin-derived phenols on fermentative strains has been widely investigated, whereas few reports are available on their inhibition on cellulose hydrolysis. Kim et al.(2013) investigated the effect of soluble inhibitors on cellulase and found that phenolic compounds and xylo-oligosaccharides were the most important causes leading to the decrease in cellulase activity. Ximenes et al.(2011;2010) confirmed that vanillin, syringaldehyde, trans-cinnamic acid and hydroxybenzoic acid inhibited cellulose hydrolysis in wet cake. What’s more, their

关键词： vanillin cellulase inhibition kinetics HCH-1 model inhibitory group

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丙酮、乙醇对丁醇渗透汽化性能的影响

化工学报 2010年第5期61卷 1143-1149页

作者：周浩力苏仪伊守亮万印华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 中国科学院研究生院北京100049

考察了全硅沸石silicalite-1对丁醇-水、丙酮-水、乙醇-水、丙酮-丁醇-水、乙醇-丁醇-水5种体系中各溶剂的吸附作用。采用自制的silicalite-1/硅橡胶杂化渗透汽化透醇膜,研究了温度对丙酮、丁醇、乙醇分离性能的影响以及不同分离温度下... 详细信息

考察了全硅沸石silicalite-1对丁醇-水、丙酮-水、乙醇-水、丙酮-丁醇-水、乙醇-丁醇-水5种体系中各溶剂的吸附作用。采用自制的silicalite-1/硅橡胶杂化渗透汽化透醇膜,研究了温度对丙酮、丁醇、乙醇分离性能的影响以及不同分离温度下丙酮、乙醇的浓度对丁醇、水渗透汽化性能的影响,结果表明丙酮和乙醇的存在会促进丁醇的透膜性。

关键词：渗透汽化丙酮-丁醇-乙醇膜 silicalite-1

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轻工业纤维素生物质过程残渣能源化技术

化学进展 2007年第7期19卷 1164-1176页

作者：许光文纪文峰万印华刘春朝中国科学院过程工程研究所北京100080

以农产品为原料的轻工业大都是典型的流程工业,在通过转化过程将原料转化为食品、饮料、添加剂、调味料、纸和中成药等产品的同时产生被称为过程残渣的固体废物与废料,如白酒糟、酒精糟、醋糟、甘蔗渣、中药渣、油粕、酱渣、菌渣和造纸... 详细信息

以农产品为原料的轻工业大都是典型的流程工业,在通过转化过程将原料转化为食品、饮料、添加剂、调味料、纸和中成药等产品的同时产生被称为过程残渣的固体废物与废料,如白酒糟、酒精糟、醋糟、甘蔗渣、中药渣、油粕、酱渣、菌渣和造纸黑液可熔渣等。这些残渣产生于特定的生产过程,富含纤维素、蛋白质或木质素,因此代表一种已经被集中的生物质资源。它们同时含水50%—80%、易腐烂变质、甚至呈弱酸碱性,因此是重要的环境污染源。本文着眼于轻工生物质过程残渣的高值化利用,分析指出富含纤维素的白酒糟、醋糟、甘蔗渣、中药渣、茶渣和造纸边角料等适合作为生物质能源而被转化利用,并根据资源特征提出了可能的技术路线。通过分别对热化学路线涉及的脱水干燥、燃烧发电与气化发电技术和集成乙醇发酵、沼气发酵的复合转化技术进行技术综述,最后针对不同规模的富含纤维素轻工生物质过程残渣能源化提供了技术选择建议。

关键词：过程残渣轻工业生物质燃烧生物质气化纤维素乙醇沼气

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混凝-纳滤组合工艺处理印染整理废水

水处理技术 2018年第11期44卷 84-87,92页

作者：刘威杭晓风万印华中国科学院过程工程研究所生化工程国家重点实验室100190 中国科学院大学北京100840

以聚丙烯酰胺(PAM)为助凝剂,比较了4种絮凝剂对印染整理废水中的COD和浊度的去除效果,通过正交实验确定了优化混凝条件;并进一步采用纳滤膜NF270对混凝上清液进行处理,纳滤浓缩液再经混凝-纳滤在处理。结果表明,混凝优化条件,pH为7,聚... 详细信息

以聚丙烯酰胺(PAM)为助凝剂,比较了4种絮凝剂对印染整理废水中的COD和浊度的去除效果,通过正交实验确定了优化混凝条件;并进一步采用纳滤膜NF270对混凝上清液进行处理,纳滤浓缩液再经混凝-纳滤在处理。结果表明,混凝优化条件,pH为7,聚合氯化铝(PAC)、PAM投加量分别为400、1.6 mg/L,在此条件下,废水中COD去除效果最好,去除率达88%以上。混凝后的上清液经纳滤膜处理,出水COD为33 mg/L;纳滤浓缩液再经混凝-纳滤再处理后,出水COD可降至30 mg/L,出水水质均满足GB/T 19923-2005的工业用水回用要求。实际应用中可将纳滤浓缩液与原废水混合进行处理,实现废水零排放。

关键词：印染整理废水混凝纳滤水回用