Viscosity and structure of a CaO-SiO2-FeO-MgO system during a modified process from nickel slag by CaO

doi:10.3390/ma12162562

CORC > 兰州理工大学 > 兰州理工大学 > 省部共建有色金属先进加工与再利用国家重点实验室

	Viscosity and structure of a CaO-SiO2-FeO-MgO system during a modified process from nickel slag by CaO
	Shen, Yingying; Chong, Junkai; Huang, Ziniu; Tian, Jianke; Zhang, Wenjuan; Tang, Xingchang; Ding, Wanwu; Du, Xueyan
刊名	Materials
	2019-08-01
卷号	12 期号:16
关键词	Alkalinity Iron oxides Magnesia Nickel Olivine Silica Silicates Structure (composition) Viscosity Comprehensive utilizations Critical viscosity Degree of polymerization Hemispherical temperatures Homogeneous liquids Liquidus temperature Melting characteristics Softening temperature
DOI	10.3390/ma12162562
英文摘要	There is a high iron content in nickel slag that mainly exists in the fayalite phase. Basic oxide can destroy the stable structure of fayalite which is beneficial to the treatment and comprehensive utilization of nickel slag. The research was based on the composition of the raw nickel slag, taking the CaO-SiO2-FeO-MgO system as the object and CaO as a modifier. The effect of basicity on the melting characteristics, viscosity and structure of the CaO-SiO2-FeO-MgO system was studied. The relationship between the viscosity and structure of the CaO-SiO2-FeO-MgO system was also explored. The results show as follows: (1) When the basicity is lower than 0.90, the primary phase of the slag system is olivine phase. When the basicity is greater than 0.90, the primary phase of the slag system transforms into monoxide. When the basicity is 0.90, olivine and monoxide precipitate together as the temperature continues to decrease. At the same time, the liquidus temperature, softening temperature, hemispherical temperature, and flow temperature all reach the lowest value. (2) With the increase of basicity, the critical viscosity temperature of the CaO-SiO2-FeO-MgO system decreases first and then increases. Critical viscosity temperature is the lowest at the basicity of 0.90, which is 1295 °C. (3) When the slag system is heterogeneous, the viscosity of the molten slag increases rapidly because of the quantity of solid phase precipitated from the CaO-SiO2-FeO-MgO system. (4) When the slag system is in a homogeneous liquid phase, the molar fraction of O0 decreases with the increase of basicity and the mole fraction of O-, and O2- increases continuously at the basicity of 0.38~1.50. The silicate network structure is gradually depolymerized into simple monomers, resulting in the degree of polymerization, and the viscosity, being reduced. The mole fraction of different kinds of oxygen atoms is converged to a constant value when the basicity is above 1.20. © 2019 by the authors.
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering ; Physics
语种	英语
出版者	MDPI AG, Postfach, Basel, CH-4005, Switzerland
WOS记录号	WOS:000484464800063
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/113908]
专题	省部共建有色金属先进加工与再利用国家重点实验室材料科学与工程学院研究生院
作者单位	School of Materials and Science, State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Shen, Yingying,Chong, Junkai,Huang, Ziniu,et al. Viscosity and structure of a CaO-SiO2-FeO-MgO system during a modified process from nickel slag by CaO[J]. Materials,2019,12(16).
APA	Shen, Yingying.,Chong, Junkai.,Huang, Ziniu.,Tian, Jianke.,Zhang, Wenjuan.,...&Du, Xueyan.(2019).Viscosity and structure of a CaO-SiO2-FeO-MgO system during a modified process from nickel slag by CaO.Materials,12(16).
MLA	Shen, Yingying,et al."Viscosity and structure of a CaO-SiO2-FeO-MgO system during a modified process from nickel slag by CaO".Materials 12.16(2019).