Nonisothermal Crystallization, Growth, and Shape Control of Magnetite Crystals in Molten Nickel Slag During Continuous Cooling

doi:10.1007/s11663-022-02491-9

	Nonisothermal Crystallization, Growth, and Shape Control of Magnetite Crystals in Molten Nickel Slag During Continuous Cooling
	Li, Bin; Du, Xueyan; Shen, Yingying; Zhang, Zhilong; Rong, Taolin
刊名	METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
	2022
卷号	53 期号:3 页码:1816-1826
关键词	Activation energy Cooling Growth rate Magnetite Metal recovery Continuous cooling Cooling rates Crystallization control Crystallization growth Growth control Magnetite crystals Molten Slag Nonisothermal crystallization Recovery of valuable metals Shape control
ISSN号	1073-5615
DOI	10.1007/s11663-022-02491-9
英文摘要	Efficient recovery of valuable metals from metallurgical slag has attracted an increasing amount of attention in recent years. In this paper, iron from nickel slag was recycled efficiently via a molten oxidation method. Nonisothermal crystallization of oxidized molten nickel slag and the growth of magnetite crystals were observed in situ by high-temperature confocal laser scanning microscopy (HT-CLSM). The growth and shape-control mechanism of magnetite crystals were also analyzed. The results show that the initial crystallization temperature of magnetite crystals in the melt was approximately 1450 degrees C, and the stable growth temperature ranged from 1400 degrees C to 1200 degrees C. The average growth rate of the crystals ranged from 0.013 to 0.141 mu m/s at cooling rates of 5 to 50 degrees C/min. The magnetite crystals formed in the molten slag exhibit granular and dendritic morphologies. Stirring in the melt favors the formation of granular crystals with octahedral structures and depresses dendrite growth. The crystallization dynamics of magnetite crystals in molten slag is dominated by diffusion control, and the crystallization changed from three-dimensional growth to low-dimensional growth with the decrease of crystallization temperature. The apparent crystallization activation energy is in the range of - 581.98 +/- 46.86 to - 339.36 +/- 34.01 kJ/mol at a cooling rate of 5 to 50 degrees C/min.
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000773847800003
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/158090]
专题	材料科学与工程学院研究生院
作者单位	Lanzhou Univ Technol, Sch Mat Sci & Engn, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Li, Bin,Du, Xueyan,Shen, Yingying,et al. Nonisothermal Crystallization, Growth, and Shape Control of Magnetite Crystals in Molten Nickel Slag During Continuous Cooling[J]. METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE,2022,53(3):1816-1826.
APA	Li, Bin,Du, Xueyan,Shen, Yingying,Zhang, Zhilong,&Rong, Taolin.(2022).Nonisothermal Crystallization, Growth, and Shape Control of Magnetite Crystals in Molten Nickel Slag During Continuous Cooling.METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE,53(3),1816-1826.
MLA	Li, Bin,et al."Nonisothermal Crystallization, Growth, and Shape Control of Magnetite Crystals in Molten Nickel Slag During Continuous Cooling".METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE 53.3(2022):1816-1826.