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copper removal from Molten Steel by Gasification

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Journal of Iron and Steel Research(International) 1999年第2期6卷 10-13页

作者： Li Liansheng Li Shiqi Xiang Changxiang Cao Jie Liu Keming Li Suqin University of Science and Technology Beijing

A novel method is proposed to enhance the gasification and removal of copper from molten steel by adding ammonium salts or urea into molten steel under normal pressure.The decopperization experiments were conducted in a molybdenum-wire resistance furnace at 1 873 K.The copper content of about 400 g of a mild steel was reduced from 0.49%(mass fraction,the same below) and 0.51% to 0.31% and 0.38% using 0.7 g of NHC1 and 0.5 g of(NH)COrespectively,while the copper content of the molten steel was reduced from 0.61%to 0.56% using 2.00 g of NHCONH.

关键词： molten steel copper removal ammonium salt

Study on the Structures and Properties of copper removal Adsorbent Prepared from Sinter-free Pulverized Oyster Shell Materials

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Chinese Journal of Structural Chemistry 2014年第2期33卷 263-269页

作者：蔡云吴琼符成于岩 College of Materials Science and Engineering New Campus of Fuzhou University

A hollow tubular copper removal adsorbent was prepared with oyster shell and cement as the main raw materials. The effects of different formulas, different initial copper concentrations and different pH values of samples on the copper removal efficiency were investigated to determine the optimal conditions for copper removal. The content of copper in the wastewater is determined by Atomic Absorption Spectrophotometer. The microstructure and elemental composition of the samples were characterized by scanning electron microscopy（SEM） and EDS. As a result, the formula with the content of cement to be 8 wt% and the oyster shell powder of 92 wt% is optimal. Under the condition of 30 ℃, when the pH value was 9.0, the Cu2＋ adsorption capacity of the sample could reach 0.59 mg/g at 48 h. SEM analysis revealed that there are abundant pores in the sample, which is beneficial for Cu2＋ absorption on the adsorbent.

关键词： portland cement oyster shell powder copper removal sinter-tree

removal of copper from molybdenite concentrate by mesophilic and extreme thermophilic microorganisms

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International Journal of Mining Science and Technology 2013年第6期23卷 827-834页

作者： Abdollahi Hadi Manafi Zahra Shafaei Sied Ziaedin Noaparast Mohammad Manafi Moorkani Navid School of Mining College of EngineeringUniversity of Tehran Sarcheshmeh copper Complex Research and Development Centre

Mixed mesophilic and extreme thermophilic bioleaching were evaluated to remove copper from the molybdenite concentrate.Bioleaching tests were carried out in shake flasks and in a 50-L bioreactor.The shake flask tests were performed with different inoculum size,solids density,pH.and temperature in order to identify optimum conditions.The highest amount of copper elimination,75%was obtained with extreme thermophilic microorganisms(at 12%inoculation,10%solids,65℃and a pH of 1.5).The highest copper elimination by mesophilic microorganisms was 55%(at 12%inoculation,5%solids,30℃at pH 2).The optimum conditions in shake flask tests were applied to 7 days batch tests in a50-L bioreactor.Extreme thermophilic experiment gave the best copper elimination of 60%(at 12%inoculation,10%solids,65℃and pH 1.5).Mesophilic test removed 50%of the copper(at 12%inoculation,10%solids,35℃at pH 2).

关键词： Bioleaching Molybdenite concentrate copper removal Mesophilic and extreme thermophilic microorganisms

removal of copper by modified chitosan adsorptive membrane

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Frontiers of Chemical Science and Engineering 2009年第1期3卷 102-106页

作者： Xiaoshuai LIU Zihong CHENG Wei MA Department of Chemistry Dalian University of TechnologyDalian 116024China

In this study,a novel adsorptive membrane was prepared from chitosan as the functional polymer and some additive blend solutions by solution casting method.The modiﬁed chitosan membrane was characterized by FTIR and its Water Swelling Ratio(WSR).The adsorption of copper ions on the adsorptive membrane was investi-gated in batch experiments.The results obtained from the experiments indicated that the membrane had a good adsorption capacity for copper ions,the optimal ionic strength and pH were 0.1 and 5–6,respectively.Compared with the Langmuir isotherm model,the experimental data were found to be following the Freundlich model.

关键词： chitosan adsorptive membrane copper removal environmental engineering heavy metal isotherm model

LABORATORY RESEARCH ON copper removal FROM MOLTEN STEEL UNDER VACUUM

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LABORATORY RESEARCH ON COPPER REMOVAL FROM MOLTEN STEEL UNDE...

Insights into influence of aging processes on zero-valent iron modified biochar in copper(II) immobilization: from batch solution to pilot-scale investigation

International Symposium on Global Environment and Steel Industry(ISES’03)

作者： Pei Limiao Yan Liyi (Northeastern University)

＜正＞In this paper, the thermodynamic analyze is used, based on vacuum metallurgy theory, the orthogonal experimental method is adopted to get the best programmer of copper removal from molten steel in vacuum. This p... 详细信息

关键词： copper removal molten steel refining

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Frontiers of Chemical Science and Engineering 2023年第7期17卷 880-892页

作者： Huabin Wang Dingxiang Chen Yi Wen Ting Cui Ying Liu Yong Zhang Rui Xu School of Energy and Environment Science Yunnan Normal UniversityKunming 650500China Yunnan Key Laboratory of Rural Energy Engineering Kunming 650500China

The zero-valent iron modified biochar materials are widely employed for heavy metals immobilization.However,these materials would be inevitably aged by natural forces after entering into the environment,while there are seldom studies reported the aging effects of zero-valent iron modified biochar.In this work,the hydrogen peroxide and hydrochloric acid solution were applied to simulate aging conditions of zero-valent iron modified biochar.According to the results,the adsorption capacity of copper(II)contaminants on biochar,zero-valent iron modified biochar-1,and zero-valent iron modified biochar-2 after aging was decreased by 15.36%,22.65%and 23.26%,respectively.The surface interactions were assigned with chemisorption occurred on multi-molecular layers,which were proved by the pseudo-second-order and Langmuir models.After aging,the decreasing of capacity could be mainly attributed to the inhibition of ion-exchange and zero-valent iron oxidation.Moreover,the plant growth and soil leaching experiments also proved the effects of aging treatment,the zero-valent iron modified biochar reduced the inhibition of copper(II)bioavailability and increased the mobility of copper(II)after aging.All these results bridged the gaps between bio-adsorbents customization and their environmental behaviors during practical agro-industrial application.

关键词： zero-valent iron modified biochar aging processes copper removal adsorption pilot-scale experiments

Recovery of Cu(Ⅱ) from aqueous solution by induced crystallization in a long-term operation

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Journal of Environmental Sciences 2018年第7期30卷 183-191页

作者： Zhimou Wei Ya Xiong Jian Chen Jing Bai Jing Wu Jiane Zuo Kaijun Wang School of Environment Tsinghua University Beijing 100084 China Department of Environmental Science and Engineering China University of Geosciences Beijing 100083 China Chinese Academy for Environmental Planning Beijing 100012 China

The feasibility of copper recovery by induced crystallization in a long period（174 days） was investigated in a seeded fluidized bed reactor（FBR）. The process was divided into 3 periods according to different influent conditions, and the period Ⅲ was separated into Ⅲ-a and Ⅲb due to the adjustment of the molar ratio of CO3^2- concentration to copper concentration（[CT]/[Cu^2＋]）. The removal efficiency could exceed 95% and the average effluent copper concentration decreased to 3.0 mg/L. The mean particle size of seed grains with copper crystals coating on, raised to 0.36 mm from initial 0.18 mm. During period Ⅲ-a, the supersaturation exceeded 2.88 × 104, the removal efficiency decreased to 60%–80% and the particle size dropped to 0.30 mm, due to the generation of fines by homogeneous crystallization and seeds breaking. And the morphology of the crystals on the seed grains changed from rod-like to spherical which lead to the particle size decreasing. In period Ⅲ-b,the supersaturation was modified by adjusting the molar ratio of [CT]/[Cu^2＋] to 1.2 from 2.The efficiency was back to 95% and the mean particle size grew to 0.36 mm at the end of Ⅲb, the crystals coating on the seeds turned back to rod-like products of good stability. This study illustrated that the copper salt crystal could keep on growing on the seed grains for over 150 days, the feasibility and controllability of copper recovery by induced crystallization process in FBR were satisfactory, even under the dramatic changes in influent conditions.

关键词： copper removal Induced crystallization Fluidized bed reactor Supersaturation Long-term operation

copper Elimination from the Molten Steel by Addition of Hydronitrogens

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International Journal of Minerals,Metallurgy and Materials 1998年第2期12卷 93-96页

作者： Liansheng Li~(1)) Changxiang Xiang~(1)) Jie Cao~(1)) Shiqi Ii~(1)) Eiji Ichise~(2)) 1)Applied Science School, UST Beijing, Beijing 100083, China 2) The Kyoto University, Kyoto, Japan Applied Science School UST Beijing Beijing 100083 China Kyoto University Kyoto Japan

A novel method has been proposed to remove copper from molten steel by adding the compounds of hydrogen and nitrogen into the melt at normal pressure. Feasibility experiments were carried out in Mo-wire resistance furnace at 1600℃. The copper content of about 400 g 45 steel were reduced from 0.60% and 0.57% to 0.41% and 0.51% with 3.25g and 1.20 g NH_4Cl respectively, while the copper contents of about 300 g steel melt were reduced from 1.15% and 0.61% to 0.90% and 0.56% with 4.10 g and 2.00 g NH_2CONH_2. These results indicate that the proposed method is very promising to be put into practical and worthwhile of further study.

关键词： molten steel copper removal hydronitrogens

油页岩灰渣合成Na-A沸石用于去除水溶液中Cu2+(英文)

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Chinese Journal of Chemical Engineering 2013年第9期21卷 974-982页

作者：包维维刘璐邹海峰甘树才徐学纯季桂娟高桂梅郑克岩 College of Chemistry Jilin University College of Earth Science Jilin University

Na-A zeolite was synthesized using oil shale ash(OSA),which is a solid by-product of oil shale processing.The samples were characterized by various techniques,such as scanning electron microscopy,X-ray diffraction and Brunauer Emmet Teller method.The batch isothermal equilibrium adsorption experiments were performed to evaluate the ability of Na-A zeolite for removal of Cu(II) from aqueous solutions.The effects of operating parameters,such as concentration of copper solutions,adsorbent dosages,pH value of solutions and temperature,on the adsorption efficiency were investigated.The equilibrium adsorption data were fitted with Langmuir and Freundlich models.The maximum adsorption capacity of Na-A zeolite obtained from the Langmuir adsorption isotherm is 156.7 mg·g 1of Cu(II).The increase of pH level in the adsorption process suggests that the uptake of heavy metals on the zeolite follows an ion exchange mechanism.The batch kinetic data fit the pseudo-second order equation well.The thermodynamic parameters,such as changes in Gibbs free energy( G),enthalpy( H) and entropy( S),are used to predict the nature of the adsorption process.The negative G values at different temperatures confirm that the adsorption processes are spontaneous.

关键词： oil shale ash zeolite copper removal adsorption isotherm