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leaching　mechanism　of　the　Spodumene　Sulphuric　Acid　Process

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Rare Metals 1997年第1期16卷 37-45页

作者：肖明顺王世亨张琴芳张锦文

leaching mechanism of acid roasted ore in the spodumene sulphuric acid process was investigated. Experimental results of leaching rates along with variations of leaching temperature in the acidized and neutral leaching processes were reported. Applying ion exchange mechanism in acidized roasting and absorption entrainment mechanism at high temperature, leaching mechanism was discussed. A better explanation of experimental results was given.

关键词： Spodumene Sulphuric acid process leaching mechanism leaching of lithium

mechanism of Chalcopyrite leaching in Oxidative Sulphuric Acid Solution

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Journal of Chemistry and Chemical Engineering 2011年第1期5卷 37-41页

作者： Miroslav D. Sokic Branislav R. Markovic Vladislav Lj. Matkovic Nada D. Strbac Dragana T. Zivkovic Institute for Technology of Nuclear and Other Mineral Raw Materials 86 Franchet d ＇Esperey Street Belgrade 11000 Serbia Technical Faculty at Bor University of Belgrade Bor 19210 Serbia

The mechanism of the leaching process of chalcopyrite concentrate with sodium nitrate in sulphuric acid solution were studied and discussed. Chemical reactions of leaching and their thermodynamic probabilities are predicted based on the calculated Gibbs energies and analysis of E-pH diagrams. Experimental data, thermodynamic analysis, chemical, XRD, and SEM/EDX analyses of concentrate and the leach residues, were performed to develop a better understanding of the chemical reactions that took place in the system. Elemental sulphur was formed as the main leaching product, precipitated at the particle surfaces and tended to inhibit the leaching rate.

关键词： Chalcopyrite leaching mechanism sulpruric acid sodium nitrate.

Kinetic study of high-pressure acid leaching of Mg and Ni from serpentine

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Journal of Central South University 2022年第2期29卷 410-419页

作者： WU Ling-long YANG Xi-yun XU Hui ZHONG Zhi-jie WANG Xiao-di School of Metallurgy and Environment Central South UniversityChangsha 410083China

Inner Mongolian serpentine ore was subjected to sulfuric acid leaching tests,and the effects of the leaching process parameters on the leaching efficiency of different metals were *** leaching efficiency of Mg,Fe,Al,Ni,and Co reaches 93.98%,60.09%,82.08%,90.58%,and 94.06%,respectively,under the leaching conditions of 5 mol/L H_(2)SO_(4),liquid/solid ratio of 4 mL/g,and leaching temperature 100℃.Hence,the valuable metals in serpentine were effectively recovered by sulfuric acid *** leaching behaviors of Mg,Fe,and a small amount of Al were analyzed using X-ray *** results show that the unreacted Mg and Fe remained as MgFe_(2)O_(4),and Al formed Al_(2)Si_(2)O_(5)(OH)_(4) in the leaching *** kinetics of Mg and Ni in the leaching process was studied *** leaching kinetics of Mg conformed to the shrinking core model with an activation energy of 16.95 kJ/mol,which was controlled by the combination of the diffusion and chemical *** leaching kinetics of Ni accorded with the Avrami equation with an activation energy of 11.57 kJ/mol,which was controlled by *** the study,the valuable metal elements were extracted from serpentine minerals with high efficiency and low cost,which possessed important practical values.

关键词： serpentine sulfuric acid leaching mechanism thermodynamics leaching kinetics

Reductive acid leaching of valuable metals from spent lithium-ion batteries using hydrazine sulfate as reductant

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Transactions of Nonferrous Metals Society of China 2020年第8期30卷 2256-2264页

作者： Jian YANG Liang-xing JIANG Fang-yang LIU Ming JIA Yan-qing LAI School of Metallurgy and Environment Central South UniversityChangsha 410083China

Hydrazine sulfate was used as a reducing agent for the leaching of Li,Ni,Co and Mn from spent lithium-ion *** effects of the reaction conditions on the leaching mechanism and kinetics were characterized and examined.97%of the available Li,96%of the available Ni,95%of the available Co,and 86%of the available Mn are extracted under the following optimized conditions:sulfuric acid concentration of 2.0 mol/L,hydrazine sulfate dosage of 30 g/L,solid-to-liquid ratio of 50 g/L,temperature of 80℃,and leaching time of 60 *** activation energies of the leaching are determined to be 44.32,59.37 and 55.62 k J/mol for Li,Ni and Co,*** performing X-ray diffraction and scanning electron microscopy in conjunction with energy dispersive X-ray spectroscopy,it is confirmed that the main phase in the leaching residue is *** results show that hydrazine sulfate is an effective reducing agent in the acid leaching process for spent lithium-ion batteries.

关键词： spent lithium-ion batteries reductive acid leaching hydrazine sulfate leaching mechanism kinetics

Optimization of Ex-Situ Washing Removal of Polycyclic Aromatic Hydrocarbons from a Contaminated Soil Using Nano-Sulfonated Graphene

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Pedosphere 2017年第3期27卷 527-536页

作者： GAN Xinhong TENG Ying REN Wenjie MA Jun Peter CHRISTIE LUO Yongming Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Science Chinese Academy of Sciences University of Chinese Academy of Sciences College of Materials and Chemistry Tongren University

Ex-situ soil washing technology offers advantages such as speed and efficiency of remediation and range of application and has been developed to conform with legal requirements and best management practices in USA and some European countries. In this study, nano-sulfonated graphene （SGE） was used as a washing agent to evaluate different processing （washing） parameters for the ectopic leaching removal of polycyclic aromatic hydrocarbons （PAHs） from a coking plant soil. X-ray photoelectron spectroscopy （XPS） and fourier transform infrared spectroscopy （FTIR） were used to analyze the characteristics of the SGE tested. The results showed that SGE had a strong adsorption capacity for PAHs through the role of π-π, H-π, and anion-π interactions. The washing parameters, an SGE concentration of 2000 mg L-1, a liquid/soil （L/S） ratio of 10：1, and 4 cycles of successive washing, were set to arrive to the optimum condition for achieving more than 80% of PAH removal. Under the optimum condition, the PAH removal rate decreased with increasing ring numbers. After one washing cycle at SGE concentration of 2000 mg L-1 and L/S ratio of 10：1, the PAH removal rate of the SCE tested was much higher than that of Tween 80 （TW80） or methyl-β-cyclodextrin （MCD）（P 〈 0.01）. Therefore, SGE is a promising material for the nanoremediation of PAH-contaminated soils.

关键词： adsorption capacity leaching mechanism nanoremediation optimum condition washing agent washing parameter