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Chemical Evolution of LiCoO2 and NaHSO4·H2O Mixtures with Different Mixing Ratios During roasting Process

Chemical Research in Chinese Universities 2016年第4期32卷 674-677页

作者： WANG Dahui WEN Hao CHEN Huaijing YANG Yujiao LIANG Hongyan State Key Laboratory of Advance Processing and Recycling of Nonferrous Metals College of Science Lanzhou University of Technology Lanzhou 730050 P R. China

Mixtures of NaHSO4·H2O and LiCoO2 extracted from spent lithium-ion batteries were prepared with molar ratios of 1：1, 1：2 and 1：3. The chemical evolution of the LiCoO2 and NaHSO4-H20 mixtures during the roasting process was investigated by means of thermogravimetric analysis and differential scanning calorimetry （TG-DSC）, X-ray diffraction（XRD）, scanning electron （XPS）. The results show that the chemical reactions in microscopy（SEM）, and X-ray photoelectron spectroscopy the LiCoO2 and NaHSO4·H2O mixtures proceed during the roasting process. The Li element in the product of the roasting process is in the form of LiNa（SO4）. With the increase of the proportion of NaHSO4·H2O in the mixtures, the Co element evolves as follows： LiCoO2→Co3O4→Na6Co（SOa）4→Na2Co（SO4）2. The roasting products exhibit dense structures and irregular shapes, and the bonding energy of Co increases.

关键词： Spent lithium-ion battery LiCo02 sulfating roasting Chemical evolution

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Separation of halogens and recovery of heavy metals from secondary copper smelting dust

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Transactions of Nonferrous Metals Society of China 2024年第8期34卷 2686-2701页

作者： Zhi-lou LIU Zhi-kang CHEN Fu-ze SUN Zhi-heng ZHANG Kang YAN Shui-ping ZHONG Hui LIU Rui-xiang WANG Jia-yuan LI Zhi-feng XU School of Metallurgy Engineering Jiangxi University of Science and TechnologyGanzhou 341000China School of Chemistry and Environmental Science Xiangnan UniversityChenzhou 423000China Ganzhou Engineering Technology Research Centre of Green Metallurgy and Process Intensification Ganzhou 341000China Key Laboratory of Ionic Rare Earth Resources and Environment Ministry of Natural ResourcesGanzhou 341000China

The separation of halogens and recovery of heavy metals from secondary copper smelting(SCS)dust using a sulfating roasting−water leaching process were *** thermodynamic analysis results confirm the feasibility of the phase transformation to metal sulfates and to gaseous HF and *** the sulfating roasting conditions of the roasting temperature of 250℃ and the sulfuric acid excess coefficient of 1.8,over 74 wt.%of F and 98 wt.%of Cl were volatilized into flue *** 98.6 wt.%of Zn and 96.5 wt.%of Cu in the roasting product were dissolved into the leaching solution after the water leaching process,while the leaching efficiencies of Pb and Sn were only 0.12%and 0.22%,*** mechanism studies indicate the pivotal effect of roasting temperature on the sulphation reactions from various metal species to metal sulfates and the salting out reactions from various metal halides to gaseous hydrogen halides.

关键词： secondary copper smelting dust sulfating roasting water leaching halogen volatilization heavy metal separation

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