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A new method for direct synthesis of Li2CO3 powders by membrane electrolysis

Rare Metals 2018年第8期37卷 716-722页

作者： Xi-Juan Pan Ting-An Zhang Zhi-He Dou Guo-Zhi Lyu Xiu-Xiu Han Jun-Jie Zhang School of Metallurgy Northeastern University Shenyang 110819 China Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Education Ministry Shenyang 110819China

A new method for the direct synthesis of Li2CO3 powders by membrane electrolysis from LiC1 solution is demonstrated in this paper, where a novel electrolysis system combining ventilation, agitation and loop filtration functions was reported. The aim of this work is to explore the effect of the starting concentration of LiC1 on the phase and micromorphology of Li2CO3 crystals and thereafter to explore the mechanism of crystallization and grain growth law. Scanning electron microscopy （SEM） images indicate that the particles become irregular polycrystalline from well-defined flower-like and the micro-crystals change from lamellar to needle-like and subsequently to smaller globular granules, and the surface of the crystals becomes smooth with LiC1 concentration increasing from 50 to 400 g.L^-3. The crystalline phases of the different samples were characterized using powder X-ray diffraction （XRD） and the results prove that pure LiaCO3 crystals can be obtained in a single step by the electrolysis method. The particle size distributions show that both volume mean crystal sizes and the full width at half maximum （FWHM） decrease when the starting LiC1 concentration increases from 50 to 300 g.L 3 and also decreases from 400 to 300 g-L^-3.

关键词： Lithium carbonate Lithium chloride membrane electrolysis Carbon dioxide

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Cleaner production of ammonium paratungstate by membrane electrolysis-precipitation of sodium tungstate solution

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Tungsten 2023年第1期5卷 145-159页

作者： Afolabi Uthmon Olayiwola Hao Du Shao-Na Wang Biao Liu Ye-Qing Lv Bo Pan University of Chinese Academy of Sciences Beijing 100049China CAS Key Laboratory of Green Process and Engineering National Engineering Research Center of Green Recycling for Strategic Metal ResourcesInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China

The production of ammonium paratungstate(APT) is riddled with the generation of wastewater,which causes environmental *** solve the problem of wastewater generation at source,a membrane electrolysis-NH3·H2O precipitation method,which prevents wastewater generation and recycles the reagents used in the process,was proposed and investigated in this *** electrolysis process was investigated based on parameters such as initial cathodic and anodic NaOH concentrations,and current *** results showed that an increase in current density and initial cathodic NaOH concentration and a decrease in the initial anodic NaOH concentration would enhance the separation of tungsten and *** optimum condition was found at a current density of 666 A·m^(-2),initial anodic and cathodic NaOH concentrations of 69 g·L^(-1) and 40 g·L^(-1),with a current efficiency of 75.40%,and energy consumption for producing 1 ton of NaOH was 2184 kW·*** precipitation process was investigated based on the acidic high W/Na molar ratio solution obtained by the electrolysis process with NH3·H2O as the *** such as excessive coefficient,temperature,and W/Na molar ratio were *** result showed that the variation of excessive coefficient and solution temperature had an opposite effect on the purity of the APT,while an increase in the W/Na molar ratio would increase the product *** precipitation product obtained had a purity of 99.6% and was characterized using X-ray diffraction,inductively coupled plasma,and scanning electron *** methods proposed in this study could provide fundamental information for the design of a cleaner APT production process.

关键词： membrane electrolysis Ammonium paratungstate Separation of sodium and tungsten ions Ion states of tungsten Cleaner production

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Electrolytic Regeneration of Decarbonising Potassium Carbonate Solution

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Chinese Journal of Chemical Engineering 2010年第4期18卷 538-543页

作者：刘娜赵兴雷王运东费维扬 State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

In this work,the regeneration mechanism of potassium carbonate solution after absorption of CO2 using ion-exchange membrane electrolysis was *** solutions of potassium carbonate(K2CO3) and potassium bicarbonate(KHCO3) were used to simulate the solution after absorbing *** were carried out at various electrodes,temperatures and current *** results indicate that the membrane electrolysis can in-crease concentration ratio of K2CO3 and KHCO3,and achieve 100%*** this process,not only CO2 is desorbed from carbonate solution,but also hydrogen,as a byproduct,is generated at the cathode,which is the main contributor to reduce energy ***,the membrane electrolysis is valuable in the regeneration of the K2CO3 absorbent.

关键词： membrane electrolysis Benfield regeneration carbon dioxide

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