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Strontium ferrite powders prepared from oily cold rolling mill sludge by solid-state reaction method

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Rare Metals 2013年第5期32卷 518-523页

作者： Bo Liu Shen-Gen Zang jian-jun tian De-an Pan Hang-Xin Zhu Advanced Material and Technology Institute University ofScience and Technology Beijing

Oily cold rolling mill （CRM） sludge is one of the pollutants emitted by iron and steel plants. Recycling oily CRM sludge can not only reduce pollution but also bring social and environmental benefits. In this study, using oily CRM sludge as sources of iron oxide, the strontium ferrite powders were synthesized in multiple steps including vacuum distillation, magnetic separation, oxidizing roasting, and solidstate reaction. The optimal technological conditions of vacuum distillation and oxidizing roasting were studied carefully. To consider the effects of Fe203/ SrCO3 tool ratio, calcination temperature, milling time and calcination time on magnetic properties of prepared strontium ferrite powders, the orthogonal experimental method was adopted. The maximum saturation magneti- zation （62.6 mA-m2.g-1） of the synthesized strontium ferrite powders was achieved at the Fe203/SrCO3 mol ratio of 6, 5 h milling time, 1250 ~C calcination temperature, and 1 h calcination time. Strontium ferrite powders syn- thesis method not only provides a cheap, high quality raw material for the production of strontium ferrite powders, but also effectively prevents the environmental pollution.

关键词： Strontium ferrite powders Oily cold rolling mill sludge Solid-state reaction method Recycling

New technology for recycling materials from oily cold rolling mill sludge

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International Journal of Minerals,Metallurgy and Materials 2013年第12期20卷 1141-1147页

作者： Bo Liu Shen-gen Zhang jian-jun tian De-an Pan Ling Meng Yang Liu Institute for Advanced Materials and Technology University of Science and Technology Beijing

Oily cold rolling mill （CRM） sludge is one of metallurgical industry solid wastes. The recycle of these wastes can not only protect the environment but also permit their reutilization. In this research, a new process of ＂hydrometallurgical treatment ＋ hydrothermal synthesis＂ was investigated for the combined recovery of iron and organic materials from oily CRM sludge. Hydrometallurgical treatment, mainly including acid leaching, centrifugal separation, neutralization reaction, oxidizing, and preparation of hydrothermal reaction precursor, was first utilized for processing the sludge. Then, micaceous iron oxide （MIO） pigment powders were prepared through hydrothermal reaction of the obtained precursor in alkaline media. The separated organic materials can be used for fuel or chemical feedstock. The quality of the prepared MIO pigments is in accordance with the standards of MIO pigments for paints （ISO 10601-2007）. This clean, effective, and economical technology offers a new way to recycle oily CRM sludge.

关键词： cold rolling mills sludge disposal hydrometallurgy hydrothermal synthesis recycling, waste utilization

Recycle of valuable products from oily cold rolling mill sludge

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International Journal of Minerals,Metallurgy and Materials 2013年第10期20卷 941-946页

作者： Bo Liu Shen-gen Zhang jian-jun tian De-an Pan Yang Liu Alex A.Volinsky Institute for Advanced Materials and Technology University of Science and Technology Beijing Department of Mechanical Engineering University of South Florida

Oily cold rolling mill （CRM） sludge contains lots of iron and alloying elements along with plenty of hazardous organic components, which makes it as an attractive secondary source and an environmental contaminant at the same time. The compound methods of ＂vacuum distillation ＋ oxidizing roasting＂ and ＂vacuum distillation ＋ hydrogen reduction＂ were employed for the recycle of oily cold rolling mill sludge. First, the sludge was dynamically vacuum distilled in a rotating furnace at 50 r/rain and 600℃ for 3 h, which removed almost hazardous organic components, obtaining 89.2wt% ferrous resultant. Then, high purity ferric oxide powders （99.2wt%） and reduced iron powders （98.9wt%） were obtained when the distillation residues were oxidized and reduced, respectively. The distillation oil can be used for fuel or chemical feedstock, and the distillation gases can be collected and reused as a fuel.

关键词： cold rolling mills sludge recycling distillation oxidation hydrogen reduction

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Rare Metals 2017年第7期36卷 591-595页

作者： Zhi-jun Zuo De-An Pan Li-jun Wang jian-jun tian Shen-Gen Zhang Li-Jie Qiao Alex A.Volinsky School of Materials Science and Engineering University of Science and Technology Beijing Department of Mechanical Engineering University of South Florida

The effect of height on performance of the PZT/Ni cylindrical bilayered magnetoelectric （ME） com- posites was studied in situ in this paper. Multiple resonant peaks appear between 1 and 300 kHz frequency for cyl- inders of different heights. The first resonance frequency does not change with the cylinder height decreasing, but the second and the third resonant frequencies increase. The first three resonant modes radial, first-order height are attributed to the cylinder resonance, and second-order height resonance, respectively. The appropriate size and resonance frequency were chosen to obtain the highest ME voltage coefficient when designing cylindrical bilayered magnetoelectric devices. This article provides reference to design cylindrical magnetoelectric devices.

关键词： Cylindrical layered composites Height Resonant mode Demagnetization factor

Electromagnetic and microwave absorbing properties of FeCoB powder composites

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Rare Metals 2013年第4期32卷 402-407页

作者： Shen-Gen Zhang Hang-Xin Zhu jian-jun tian De-An Pan Bo Liu Yan-Tao Kang Advanced Material and Technology Institute University of Science and Technology Beijing

The electromagnetic and microwave absorbing properties of FeCoB powder composites prepared by sin- gle-roller melt-spinning and mechanical milling processes were investigated in this paper. The result indicates that the flake-like powders are obtained. As milling time increases, the flake-like powder particles tend to agglomerate, causing the flake-like powders decrease gradually. The milling time plays an important role in the electromagnetic parameters which relates to the shape and size of the powder particles. The calculation shows that the sample milled for 6 h could achieve an optimal reflection loss of -11.5 dB at 5.8 GHz, with mass fraction of 83 % and a matching thickness of 1.8 mm. The result also indicates that the microwave absorbing properties of the FeCoB powder composites are adjustable by changing their thickness, and can be applied as a thinner microwave absorbing material in the range of 2-8 GHz.

关键词： Fe48Co48B4 powder composites Mechanical milling Electromagnetic parameters Microwave absorbing properties

Recovery of copper and tin from stripping tin solution by electrodeposition

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Rare Metals 2014年第3期33卷 353-357页

作者： Bin Li De-An Pan Yu-Hui jiang jian-jun tian Shen-Gen Zhang Kun Zhang Institute for Advanced Materials and Technology School of Materials Science and Engineering University of Science and Technology Beijing Beijing Nonferrous Metals and Rare Earth Research Institute

In this paper, the method of recycling copper and tin by constant-current and constant-voltage electrolysis from the stripping tin solution of tinned copper wastes was studied. The experimental results show that the elements could be deposited on the cathode in turn by different deposition potentials, therefore, the copper and tin were separated by constant-voltage electrolysis but not constant-current electrolysis. In this study, the influence of anode materials was also investigated. Graphite anode is stable without impurities dissolved into the stripping tin solution, while 316 stainless steel anode is dissolved into Fe2？and Fe3？as anodic corrosion, which could decrease the deposition efficiency of tin. The copper and tin in the stripping tin solution are separated orderly by electrodeposition at different voltages using the graphite anode. The recovery rate of copper is up to 100 % at 2.00 V, while that of tin is 80 % at 3.00 V.

关键词： Electrodeposition Copper Tin Stripping tinsolution

Preparation of pure SnO_2 powders from tin slag of printed circuit boards waste

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Rare Metals 2014年第6期33卷 749-753页

作者： Bin Li Shen-Gen Zhang Kun Zhang De-An Pan jian-jun tian Duan-Ting Zhang Institute for Advanced Materials and Technology School of Materials Science and Engineering University of Science and Technology Beijing Beijing Nonferrous Metals and Rare Earth Research Institute

The recycling method and principle of SnO2 from the tin slag of printed circuit boards（PCB） waste were investigated. In this study, pure SnO2 powders were obtained through a multi-step process including ball-milling, roasting, dissolving, precipitating, and pickling. The total recovery rate of tin can be up to 91 %. The SnO2 powders obtained is the single phase, and the content of SnO2 is up to 99.9 %. However, the SnO2 particles are easier to agglomerate during the precipitation process. The agglomerate SnO2 particles are about 7.778 lm in mean particle size（D50）. This preparation method presents a viable alternative for the tin slag recycling. The tin is not only recycled, but also reused directly to prepare pure SnO2 powders.

关键词： SnO2 Tin slag Printed circuit boards(PCB) waste

Preparation of BaPbO_3 functional ceramics from leaded waste

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Rare Metals 2014年第5期33卷 598-603页

作者： Bin Li Shen-Gen Zhang Kun Zhang De-An Pan jian-jun tian Hu Liu Alex A.Volinsky Institute for Advanced Materials and Technology School of Materials Science and Engineering University of Science and Technology Beijing Beijing Nonferrous Metals and Rare Earth Research Institute Department of Mechanical Engineering University of South Florida

In this study, Pb was separated and used to prepare BaPbO3 conductive ceramics from leaded *** experimental results show that BaPbO3 powder synthesized at 700 °C has particle size of 2–5 lm. The powders were densified by sintering at 1,000 °C for 2 h in the *** BaPbO3 ceramics have high Curie temperature and high-temperature positive temperature coefficient（PTC） resistivity characteristics. Electrical resistivity of BaPbO3 compact increases from 5 × 10^-6Ω·m at room temperature to 4 × 10^-4Ω·m at 750 °C. Compared with the one prepared by pure chemical reagents, the BaPbO3 prepared from leaded waste has the similar characteristics of high Curie temperature and PTC resistivity.

关键词： BaPbO3 Leaded waste Positive temperature coefficient(PTC)

Antimony recovery from SbCl_5 acid solution by hydrolysis and aging

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Rare Metals 2015年第6期34卷 436-439页

作者： Ling Meng Shen-Gen Zhang De-An Pan Bin Li jian-jun tian Alex.-A.Volinsky Institute of Advanced Materials and Technology University of Science and Technology Beijing Department of Mechanical Engineering University of South Florida

This study aimed to find an efficient way to recover Sb from the SbC15 acid solution obtained by the chloride leaching process of the tin-depleted residue. Sb was recovered in the form of hydrated antimony pentoxide through the hydrolysis process. The effects of hydrolysis ratio and aging time on the Sb recovery process were studied, and the corresponding trends were established. The experimental results show that the amount of the antimony free ions increases with the hydrolysis ratio and aging time. This decreases the concentration quotient of the hydrolysis reaction and thus facilitates the reaction. Product crystallinity is affected by the solution supersaturation, which varies at different stages with aging time. As a result, the optimal conditions of recovering Sb correspond to the hydrolysis ratio of 1.5 and aging time of 7 days with the recovery rate of 97 %.

关键词： Antimony pentoxide Hydrolysis Aging Recovery Crystallinity