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Preparation of electronic grade manganese sulfate from leaching solution of ferromanganese slag

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Transactions of Nonferrous Metals Society of China 2014年第11期24卷 3716-3721页

作者：闫升邱运仁中南大学化学化工学院长沙410083 湖南省能源与化工新材料研究生培养创新基地长沙410083

Preparation of electronic grade manganese sulfate from ferromanganese slag, including grinding, leaching and purification, was studied. The impurities, such as Fe3+, Al3+, Ca2+, Mg2+, heavy metal ions and Na+, K+, were removed from leaching solution by neutralized-hydrolysis, fluorination precipitation, sulfuration precipitation and re-crystallization. Effects of pH of reaction, temperature and dosage of the different additives on removal rates of the metallic ions in leaching solution were investigated, and the suitable temperature, pH and the added amount of precipitating agent were obtained. The prepared manganese sulfate product, of which the mass fractions of Ca2+, Mg2+, Na+, K+ are all smaller than 0.005%, the mass fractions of Fe3+, Al3+ and heavy metal ions are smaller than 0.001%, and the mass fraction of Mn2+ is greater than 32%, can meet the demand of anode materials of lithium-ion batteries.

关键词： ferromanganese slag leaching purification manganese sulfate utilization of solid waste

Catalytic oxidation effect of MnSO_(4) on As(Ⅲ) by air in alkaline solution

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Journal of Environmental Sciences 2023年第4期126卷 644-655页

作者： Yuhu Li Yudong Yang Ruixiang Wang Zhifeng Xu Guizhong Jin Chengyong Jin Faculty of materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou 341000China Hsikwang Shan Twinkling Star Co.Ltd. Lengshui Jiang 417500China

The catalytic oxidation effect of MnSO_(4)on As(Ⅲ) by air in an alkaline solution was *** to the X-ray diffraction (XRD),scanning electron microscope-energy dispersive spectrometer (SEM-EDS) and X-ray photoelectron spectroscopy (XPS) analysis results of the product,it was shown that the introduction of MnSO_(4)in the form of solution would generate Na_(0.55)Mn_(2)O_(4)·1.5H_(2)O with strong catalytic oxidation ability in the aerobic alkaline solution,whereas the catalytic effect of the other product MnOOH is not *** the optimal reaction conditions of temperature 90℃,As/Mn molar ratio 12.74:1,air flow rate1.0 L/min,and stirring speed 300 r/min,As(Ⅲ) can be completely oxidized after 2 hr *** excellent catalytic oxidation ability of MnSO_(4)on As(Ⅲ) was mainly attributed to the indirect oxidation of As(Ⅲ) by the product Na_(0.55)Mn_(2)O_(4)·1.5H_(2)*** study shows a convenient and efficient process for the oxidation of As(Ⅲ) in alkali solutions,which has potential application value for the pre-oxidation of arsenic-containing solution or the detoxification of As(Ⅲ).

关键词： Arsenic Air oxidation Catalytic oxidation manganese sulfate

A pilot-scale jet bubbling reactor for wet flue gas desulfurization with pyrolusite

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Journal of Environmental Sciences 2005年第5期17卷 827-831页

作者： SU Shi-jun ZHU Xiao-fan LIU Yong-jun JIANG Wen-ju JIN Yan National Engineering Research Center for Flue Gas Desulfurization Department of Environmental Science and Engineering Sichuan University Chengdu 610065 China

MnO2 in pyrolusite can react with SO2 in flue gas and obtain by-product MnSO4· H2O. A pilot scale jet bubbling reactor was applied in this work. Different factors affecting both SO2 absorption efficiency and Mn2^＋ extraction rate have been investigated, these factors include temperature of inlet gas flue, ration of liquid/solid mass flow rate（ L/S）, pyrolusite grade, and SO2 concentration in the inlet flue gas. In the meantime, the procedure of purification of absorption liquid was also discussed. Experiment results indicated that the increase of temperature from 30 to 70 K caused the increase of SO2 absorption efficiency from 81.4% to 91.2%. And when SO2 concentration in the inlet flue gas increased from 500 to 3000 ppm, SO2 absorption efficiency and Mn2^＋ extraction rate decreased from 98.1% to 82.2% and from 82.8% to 61.7%, respectively. The content of MnO2 in pyrolusite had a neglectable effect on SO2, absorption efficiency. Low L/S was good for both removal of SO2 and Mn2^＋ extraction. The absorption liquid was filtrated and purified to remove Si, Mg, Ca, Fe, Al and heavy metals, last product MnSO4· H2O was obtained which quality could reach China GB1622-86, the industry grade standards.

关键词： wet FGD jet bubbling reactor SO2 pyrolusite manganese sulfate

Effects of two transition metal sulfate salts on secondary organic aerosol formation in toluene/NOx photooxidation

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Frontiers of Environmental Science & Engineering 2013年第1期7卷 1-9页

作者： Biwu CHU Jiming HAO Junhua LI Hideto TAKEKAWA Kun WANG Jingkun JIANG State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China Toyota Central Research and Development Laboratory Nagakute Aichi 480-1192 Japan

Aerosol phase reactions play a very important role on secondary organic aerosol (SOA) formation, and metal-containing aerosols are important components in the atmosphere. In this study, we tested the effects of two transition metal sulfate salts, manganese sulfate (MnSO4) and zinc sulfate (ZnSO4), on the photochemical reactions of a toluene/NO x photooxidation system in a 2 m3 smog chamber. By comparing photochemical reaction products of experiments with and without transition metal sulfate seed aerosols, we evaluated the effects of transition metal sulfate seed aerosols on toluene consumption, NO x conversion and the formation of ozone and SOA. MnSO4 and ZnSO4 seed aerosols were found to have similar effects on photochemical reactions, both enhance the SOA production, while showing negligible effects on the gas phase compounds. These observations are consistent when varying metal sulfate aerosol concentrations. This is attributed to the catalytic effects of MnSO4 and ZnSO4 seed aerosols which may enhance the formation of condensable semivolatile compounds. Their subsequent partitioning into the aerosol phase leads to the observed SOA formation enhancement.

关键词： manganese sulfate zinc sulfate seed aerosols toluene photooxidation secondary organic aeroso

Study on Removal of SO2 Using Pyrolusite and Mild manganese in Sintering Process

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Study on Removal of SO2 Using Pyrolusite and Mild Manganese ...