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Study of the Agglomeration Behaviour of Surface-Modified Molybdenum Powder
Xiaokai Lu,Qingkui Li,Mangmang Guo,Jinpeng Zhu,Kaijun Yang,Yongchun Shu,Jilin He 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.11
The agglomeration behaviour of Mo powder, especially fine Mo powder, has been a major concern. The degree of powderagglomeration is directly related to the uniformity of Mo and its alloy powder mixtures and related target materials. Thisstudy mainly focuses on how to efficiently reduce the soft agglomerates behaviour of Mo powder. Analysis of the micromorphologyand median particle size (D50) of modified Mo powder showed that the soft agglomerates behaviour of Mo powdercan be divided into three stages: drawing, gathering, and sticking. Modification of the Mo powder surface by the polymersurfactant PVP-K30 can effectively prevent the agglomeration of the Mo powder. Additionally, the surface hydroxyl groupsof the Mo powder disappeared, the agglomerate factor decreased from 13.02 to 5.04, and the flowability of the Mo powderwas significantly improved. This is important for improving the grain uniformity and application performance of Mo targetmaterials synthesized from Mo powder.
Yanxin Wei,Jinpeng Lu,Xiongzi Dong,Jianwen Hao,Chengli Yao 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.10
The process of coagulation-flocculation is increasingly applied in wastewater treatment. And the polymerized inorganic coagulants are widely used among these coagulation-flocculation processes. However, conventional coagulants using sulfates or chlorides as counter anion may give rise to corrosion. The purpose of this study was to synthesize PFC coagulants in which acetate is used as counter anion. The influences on the preparation of PFC were optimized. The synthesis was done at the optimum conditions, such as temperature of 60 oC, the Fe/CH3COOH molar ratio of 1 : 4.0 and reaction time of 6 h, respectively. The prepared PFC coagulants were characterized by Fourier transform infrared (FTIR) spectrophotometry and scanning electron microscopy (SEM). PFC was found to mainly form complexation polymeric species and present more cluster and lamellar structure. A series of jar tests were carried out to study the coagulation performance of PFC and PFS in phosphate-kaolin synthetic water treatment. Results showed that the coagulation performance of PFC was more efficient than PFS’s in terms of the phosphorus removal efficiency and the residual turbidity. Due to using acetate as counter anion to iron, PFC is less harmful to the processes of water treatment and equipment than that of the conventional coagulants applied chlorides or sulfates. Therefore, PFC is a promising coagulant in the process of corrosion sensitive applications and the process of wastewater containing phosphorus treatment.