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Microscale spherical TiO_(2)powder prepared by hydrolysis of TiCl_(4)solution:Synthesis and kinetics

Particuology 2024年第1期84卷 60-71页

作者： Peiyi Yan Ying Zhang shili zheng School of Rare Earths University of Science and Technology of ChinaHefei230026China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou341119China Key Laboratory of Green Process and Engineering National Engineering Research Center of Green Recycling for Strategic Metal ResourcesInstitute of Process EngineeringChinese Academy of SciencesBeijing100190China State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Panzhihua617000China

Hydrolysis of TiCl_(4)solution is capable of preparing microscale TiO_(2)*** research studied the synthesis of microscale spherical TiO_(2)powders and the hydrolysis *** effects of the flow field generated by different agitators and baffles in the crystallizer,the initial free acid concentration,the initial equivalent TiO_(2)concentration,and the temperature on the hydrolysis progress and powder morphology were systematically *** results show that the flow field in a crystallizer can significantly affect the morphology and particle size of the powders,and the axial flow can improve the sphericity of the *** increased free HCl and equivalent TiO_(2)concentrations in the pregnant solution inhibit the forward hydrolysis reaction,prolong the time to reach equilibrium,and reduce the *** appropriate temperature matching the compositions of the pregnant solution is crucial for the powder morphology and *** with sizes ranging from around 5 um-40μm can be tuned under controlled flow field,solution compositions,and temperature *** addition,the Cheng and Wunderlich modified Avrami equation was used for the crystallization kinetic *** effects of the free HCl concentration,equivalent TiO_(2)concentration,and hydrolysis temperature are reflected in the reaction rate constant and active nuclei reduction *** the free HCl and equivalent TiO_(2)concentrations will reduce the reaction rate constant and accelerate the deactivation of the active nuclei,thus increasing the final powder size,while increasing the temperature will lead to the opposite results.

关键词： TiCl_(4) Hydrolysis Microscale TiO_(2) Spherical Kinetics

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Lithium adsorption from brine by iron-doped titanium lithium ion sieves

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Particuology 2018年第6期16卷 40-47页

作者： Shulei Wang Xin Chen Ying Zhang Yang Zhang shili zheng National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process EngineeringChinese Academy of SdencesBeijing 100190China University of ChineseAcademy of Sciences No.19A Yuquan RoadBeijing 100049China School of Chemical Engineering Tianjin UniversityTianjin 300350China

Iron-doped lithium titanium oxides were prepared via a solid-state reaction and transformed into lithium ion sieves by acid *** electron microscopy,X-ray photoelectron spectroscopy,and transmission electron microscopy showed that Fe^3+was doped into the Ti-O lattice and Ti-Fe-O bonds were ***-doping improved lithium ion adsorption from *** saturated adsorption capacity of the iron-doped ion sieves in brine (Li+1.56g/L,pH =8.8)was 34.8mg/*** ion adsorption fitted pseudo-second-order kinetic and Langmuir equations,indicating that lithium ion adsorption on irondoped lithium ion sieves was chemical and predominantly *** addition,the iron-doped ion sieves showed excellent selectivity for lithium ion and good *** iron-doped ion sieves therefore provide effective lithium adsorbents for practical applications.

关键词： Iron-doped Lithium ion sieves Brine Adsorption

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Thermal Hydrolysis Synthesis and Characterization of Monoclinic Metahewettite CaV_6O_(16)·3H_2O

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Journal of Wuhan University of Technology(Materials Science) 2014年第3期29卷 433-440页

作者：李兰杰 zheng shili WANG Shaona 杜浩 ZHANG Yi National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Key Laboratory of Green Process and EngineeringInstitute of Process Engineering Chinese Academy of Sciences School of Materials and Metallurgy Northeastern University Research Center of Vanadium and Titanium Technology Chengde Iron and Steel Group Co. LTD Hebei Iron and Steel Group Co. LTD

Monoclinic metabewettite CaV6O16·3H2O has been fabricated via thermal hydrolysis of calcium vanadate （Ca10V6O25）. High purity calcium vanadate precipitate, featuring colnmn structure with surface area of 8.61 m2/g, can be obtained by reacting sodium 0rthovanadate （Na3VO4） with calcium oxide at 90 ℃ for 2 h. By acidification of calcium vanadate in hot water at pH of 1.0-3.0, the monoclinic metabewettite crystals with uniform particle distribution, layered structure and nonporous structure can be fabricated. With the well crystallized layered structure, CaV6O16·3H2O may be a potential cathode material for secondary batteries as well as super capacitor materials.

关键词： vanadium hewettite synthesis and characterization electrochemical application

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Neodymium naphthenate-loaded organic phase stripping using sodium oxalate

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Journal of Rare Earths 2022年第6期40卷 965-973,I0005页

作者： Jieying Zhou Dongying Chen Fei Niu Jikai Zhang Xiaomi Hu Ying Wu Youming Yang shili zheng Key Laboratory of Development and Application of Ionic Rare Earth Resources(Jiangxi University of Science and Technology) Ministry of EducationGanzhou 341000China Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou 341000China Ganzhou Nonferrous Metallurgy Research Institute Ganzhou 341000China Innovation Academy for Green Manufacture Chinese Academy of SciencesBeijing 100190China

Neodymium naphthenate-loaded organic phase stripping using sodium oxalate solution was studied to explore the feasibility of synchronous rare earth-loaded organic phase stripping,rare earth precipitation,and blank organic phase *** results show that loaded organic phase stripping,rare earth precipitation,and blank organic phase saponification can be realized *** using 20% excess of sodium oxalate over the stoichiometry with the volume ratio of organic phase to aqueous phase of 1:1 at 25℃ for 40 min,the single stage stripping rate and saponification value are about 40% and 0.29 mol/L,*** 16 stages of countercurrent continuous stripping,the stripping rate of neodymium can reach 99%,the saponification value is 0.42 mol/L,the Nd^(3+) concentration in saponified organic phase is less than 0.0020 mol/L,and the main phase in precipitation isNd_(2)(C2 O_(4))3·10 H_(2) ***,this saponified organic phase can be used in the extraction of NdCl_(3) solution,and then the loaded organic phases(neodymium naphthenate) with 0.16 mol/L Nd^(3+) can be *** morphology,particle size distribution,and composition of theNd_(2)(C2 O_(4))3·10 H_(2) O products are similar to those of the current direct precipitation *** neodymium oxide prepared by continuous calcination of neodymium oxalate meets the national standard of China(GB/T 5240-2015).These results prove the feasibility of stripping neodymium naphthenate-loaded organic phase by using sodium oxalate *** oxalate can serve as a stripping agent,a saponifier,and a precipitator,thereby simplifying rare earth extraction and *** study provides theoretical and technical support for the development of a novel method for rare earth extraction and separation.

关键词： Neodymium naphthenate Precipitation Saponification Sodium oxalate Stripping Rare earths

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Additives effects on crystallization and morphology in a novel caustic aluminate solution decomposition process

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Frontiers of Chemical Science and Engineering 2009年第1期3卷 88-92页

作者： Ying ZHANG shili zheng Yifei ZHANG Hongbin XU Yi ZHANG Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Graduate University of Chinese Academy of Sciences Beijing 100049China

A novel process of caustic aluminate solution decomposition by alcohol medium was developed by the Institute of Process Engineering,Chinese Academy of Sciences in order to solve the problem of low decomposi-tion ratio in the traditional Bayer seeded hydrolysis *** this research,effects of additives on the crystallization ratio,secondary particle size and morphol-ogy of aluminum hydroxide in the new process were studied to obtain high-quality *** the basis of primary selection of additives,an orthogonal design L9(3^(4))was used as a chemometric method to investigate the effects of *** studied parameters include the reaction style,quantity of additives,caustic soda concen-tration,as well as the combination *** crystal-lization ratios of sodium aluminate solution and crystal size of aluminum hydroxide,determined by ICP-OES,SEM and MLPSA(Malvern Laser Particle Size Analyzer),were used to evaluate the effects of the *** results showed that different combination manners could promote agglomeration or *** additive composed by Tween 80 and PEG 200 could promote agglomeration,while a spot of PEG species had a relatively strong dispersion ***,the additives had little effects on the crystallization *** to the Raman spectra result,the added alcohol medium might serve as a kind of solvent.

关键词： additive crystallization morphology caustic aluminate solution aluminium hydroxide

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Kinetic Investigations on the Leaching of Niobium from a Low-Grade Niobium-Tantalum Ore by Concentrated KOH Solution

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Chinese Journal of Chemical Engineering 2004年第2期12卷 202-207页

作者：周宏明郑诗礼张懿 Institute of Process Engineering Chinese Academy of Sciences Beijing 100080 China

The leaching kinetics of niobium from a low-grade niobium-tantalum ore by concentrated KOH solu-tion under atmospheric pressure has been studied. Significant effects of reaction temperature, KOH concentration, stirring speed, particle size and inass ratio of alkali-to-ore on the dissolution rate of niobium were examined. The experimental data of the leaching rates and the observed effects of the relevant operating variables were well in-terpreted with a shrinking core model under diffusion control. By using the Arrhenius expression, the apparent activation energy for the dissolution of niobium was evaluated. Finally, on the base of the shrinking core model, the rate equation was established.

关键词： clean process leaching kinetics KOH niobium-tantalum ore diffusion control

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K_2O-Nb_2O_5-H_2O三元水盐体系相图

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化工学报 2005年第3期56卷 387-391页

作者：周宏明张懿郑诗礼中国科学院过程工程研究所北京100080

采用等温溶解度法研究了30 ℃和80 ℃时K2O -Nb2O5 -H2O三元水盐体系的平衡溶解度, 并绘成了相应的相图. 为氢氧化钾亚熔盐法处理低品位难分解铌钽矿的清洁冶金新工艺中涉及的氢氧化钾 -水合六铌酸钾结晶分离提供了依据.

关键词：水合六铌酸钾溶解度氢氧化钾相图

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碱性介质活性氧调控技术在湿法冶金中的研究进展

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过程工程学报 2019年第S01期19卷 58-64页

作者：郑诗礼薛玉冬杜浩张懿中国科学院过程工程研究所湿法冶金清洁生产技术国家工程实验室绿色过程与工程重点实验室北京100190

化工冶金制造业的绿色化升级需从清洁生产技术创新入手,研发重大特色资源的高效绿色合理利用技术是实现资源环境可持续发展的关键。张懿院士开创建立的亚熔盐介质清洁化工冶金共性技术,实现了多种具有化学共性的难处理两性金属矿物的高... 详细信息

化工冶金制造业的绿色化升级需从清洁生产技术创新入手,研发重大特色资源的高效绿色合理利用技术是实现资源环境可持续发展的关键。张懿院士开创建立的亚熔盐介质清洁化工冶金共性技术,实现了多种具有化学共性的难处理两性金属矿物的高效清洁转化与分离,并建立了以活性氧调控技术为核心的亚熔盐介质化学理论体系。基于活性氧的电化学基础研究,本工作进一步提出了以电化学活性氧调控技术为核心的碱性介质电化学高级氧化新体系,为活性氧调控技术在冶金、资源和环境等领域的应用提供理论和技术支持。要点:(1)综述了亚熔盐介质清洁化工冶金共性技术的研究进展。(2)讨论了活性氧调控技术在亚熔盐介质强化两性金属分解中的应用研究进展。(3)提出以电化学活性氧调控技术为核心的碱性介质电化学高级氧化新体系。

关键词：活性氧亚熔盐湿法冶金电化学清洁生产

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含钽铌废渣中钽铌资源的综合回收工艺研究

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稀有金属 2015年第3期39卷 251-261页

作者：汪加军王晓辉张盈郑诗礼中国矿业大学(北京)化学与环境工程学院北京100083 中国科学院过程工程研究所湿法冶金清洁生产技术国家工程实验室绿色过程与工程重点实验室北京100190

对从含钽铌废渣中综合回收钽、铌的新工艺进行了研究。开发了低碱分解-水浸、稀酸预处理、氢氟酸转型浸出的湿法冶金工艺路线,通过实验确定了最佳工艺条件。其中低碱分解-水浸工艺条件为:碱渣质量比0.6∶1.0、反应温度800℃、反应时间1... 详细信息

对从含钽铌废渣中综合回收钽、铌的新工艺进行了研究。开发了低碱分解-水浸、稀酸预处理、氢氟酸转型浸出的湿法冶金工艺路线,通过实验确定了最佳工艺条件。其中低碱分解-水浸工艺条件为:碱渣质量比0.6∶1.0、反应温度800℃、反应时间1 h,添加剂Na Cl添加量为渣量的12%,水浸温度90℃,液固比6∶1,时间0.5 h。低碱分解过程中钽和铌的转化率分别为92.3%和98.2%。稀酸预处理后大部分杂质被脱除,钽、铌相对于原渣富集近5倍。转型浸出工艺条件为:硫酸用量为渣量的0.8倍,氢氟酸用量为渣量的0.6倍,反应温度为90℃,液固比为5∶1,反应时间为4 h,钽和铌的浸出率分别为99.80%和99.86%,终渣中钽和铌含量分别降至0.03%和0.01%。在最优条件下可得到含Ta2O59.50 g·L-1和Nb2O52.86 g·L-1的酸浸出液,可直接与现行工业生产中的钽铌萃取分离工艺衔接。全流程钽和铌回收率分别可达98.37%和99.15%。该工艺流程简单,操作条件温和,生产成本较低,具有显著的社会和经济效益。

关键词：钽铌废渣富集转型浸出回收

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涡轮自吸桨强化气液混合及氧化反应速率

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化工进展 2021年第12期40卷 6620-6628页

作者：刘银领范兵强张喆郑诗礼张洋天津大学化工学院天津300354 中国科学院过程工程研究所绿色过程与工程重点实验室北京100190 中国科学院过程工程研究所湿法冶金清洁生产技术国家工程实验室北京100190

自吸式搅拌桨具有强化多相及均相体系混合的特性,被广泛应用于化工冶金等领域。本文提出了一种新型涡轮自吸桨,并对其在混合及氧化还原过程中的强化作用进行了研究。以电导率法作为测定方法,以混合均匀时间作为表征参数,对搅拌转速、搅... 详细信息

自吸式搅拌桨具有强化多相及均相体系混合的特性,被广泛应用于化工冶金等领域。本文提出了一种新型涡轮自吸桨,并对其在混合及氧化还原过程中的强化作用进行了研究。以电导率法作为测定方法,以混合均匀时间作为表征参数,对搅拌转速、搅拌输入功率、示踪剂添加位置、吸气和吸液混合等影响因素进行了系统研究。研究结果表明,混合均匀时间随搅拌转速增加而降低,且存在临界转速,即为200r/min,当搅拌转速大于临界转速200r/min后,混合均匀时间基本维持稳定;当搅拌桨以吸气形式运转时,其他条件相同的情况下,自吸桨200r/min转速的混合效果与常规搅拌桨350r/min的混合效果相当;当搅拌桨以吸液形式运转时,自吸桨在0.27kW/m^(3)输入功率下可达到常规搅拌桨1kW/m^(3)以上输入功率的搅拌混合效果。同时,本文以水杨酸为活性氧捕集剂,初步探究了自吸式搅拌桨在强化氧化还原过程的机理,研究结果表明自吸式搅拌桨在吸气运转过程中,混合搅拌体系产生了羟基自由基,对应羟基化产物在120min后积累浓度为73.47μmol/L。此外,以二价铁为氧化剂受体,以二价铁的氧化效率为表征参数,对自吸式搅拌桨实际应用效果进行了系统研究,研究结果表明,在氧化二价铁的过程中,当pH为5.0时,自吸桨氧化优于曝气氧化效果;在pH=4.0、常温条件下,相较于普通搅拌桨,自吸式搅拌桨对应体系的氧化效率达到30%,是常规搅拌桨的10倍;当转速大于300r/min时,转速增加对氧化平衡终点影响较小,对氧化速率影响较大,即转速为400r/min的氧化效率比300r/min的氧化效率高30%。

关键词：涡轮自吸桨混合时间羟基自由基氧化反应

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