Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第31卷    第2期    总第263期    2021年2月

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文章编号:1004-0609(2021)-02-0453-08
氧分压对有价金属在镍造锍熔炼渣-锍间分配的影响
陈 雷1,崔雅茹1,王国华1,李旭腾1,范皓月1, 2,汤宏亮1, 2,李小明1,杨树峰3

(1. 西安建筑科技大学 冶金工程学院,西安 710055;
2. 重庆赛迪热工环保工程技术有限公司,重庆 401122;
3. 北京科技大学 冶金与生态工程学院,北京 100083
)

摘 要: 硫化镍造锍熔炼中,炉渣成分和体系氧分压对渣性能、渣中Fe3O4含量、渣?低镍锍分离特性及有价金属损失影响显著。利用Factsage软件绘制不同氧分压下NiO-FeO-CaO-SiO2-MgO系液相区和Fe-Ni-Cu-S-O系优势区,探讨pO2和pS2对低镍锍和炉渣成分的影响;通过渣?锍平衡实验并结合X射线衍射、原子吸收和X射线光电子能谱等,分析体系氧分压对于镍造锍熔炼过程中渣中有价金属镍、铜、钴损失以及m(Fe2+)/m(Fe3+)的影响规律。结果表明:适当降低体系pO2,有利于降低体系完全熔化温度和增大渣中m(Fe2+)/m(Fe3+)比。当pO2=1.01 mPa,含11% CaO和9% MgO(质量分数)熔渣与低镍锍平衡后渣中m(Fe2+)/m(Fe3+)可达12.93;合成渣和工业渣对比实验显示,降低氧分压至1.01 mPa,含7%~15% CaO(质量分数)的合成渣中Cu、Ni和Co在锍?渣中的分配比较工业渣高,有价金属损失更小。因而,调控后渣组分能满足工业生产渣?锍分离的要求。

 

关键字: 镍渣;渣-锍平衡;氧分压;有价金属;Fe3O4含量

Effect of oxygen partial pressure on distribution of valuable metals between slag and matte in nickel matte smelting process
CHEN Lei1, CUI Ya-ru1, WANG Guo-hua1, LI Xu-teng1, FAN Hao-yue1, 2, TANG Hong-liang1, 2, LI Xiao-ming1, YANG Shu-feng3

1. School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;
2. CISDI Thermal Environmental Engineering Co., Ltd., Chongqing 401122, China;
3. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China

Abstract:During the matte smelting of nickel sulphide, the composition of slag and the oxygen partial pressure has a significant effect on the properties of nickel smelting, Fe3O4 content and valuable metals loss in slag, as well as separation characteristics of slag-matte. The effect of oxygen partial pressure on the liquidus region of the NiO-FeO-CaO-SiO2-MgO slag and predominant diagram of Fe-Ni-Cu-S-O system under different oxygen partial pressure was analyzed using Factsage software. And the influence of pO2 and pS2 on the composition of low-nickel matte and slag was also investigated. Based on the equilibrium experiment between slag and matte, combined with analysis of X-ray diffractometry, atomic absorption spectrometry and X-ray photon spectroscopy, the distribution rate of m(Fe2+)/m(Fe3+) in the slag, especially the nickel, copper and cobalt between the matte and slag under different oxygen partial pressure were deeply studied. The results show that it is conducive to reduce the melting temperature and enhence the mass ratio of Fe2+ to Fe3+ in the nickel smelting slag through proper lowering pO2 of the system. It can be explored that the maximum mass ratio of Fe2+ to Fe3+ reaches up to 12.93, in the slag containing 11% CaO and 9% MgO (mass fraction) after equilibrium with nickel matte under pO2 of 1.01 mPa. Further, the contrast of equilibrium experiment for synthetic slag and industrial slag testified that the distribution coefficient of copper, nickel and cobalt of matte to slag for synthetic slag containing 7%-15% CaO (mass fraction) are higher than that of industrial slag under oxygen partial pressure of 1.01 mPa. Thus, it can be deduced that the modified tested slag can meet the requirements of slag-matte separation in industrial production.

 

Key words: nickel slag; slag-matte balance; oxygen partial pressure; valuable metal; Fe3O4 content

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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