《Table 2.Elemental composition of the Ni converter slag》

  提示：宽带有限、当前游客访问压缩模式

本系列图表出处文件名：随高清版一同展现

《Enhancement of the nickel converter slag-cleaning operation with the addition of spent potlining》

1. 获取 高清版本忘记账户？点击这里登录

1. 下载图表忘记账户？点击这里登录

wt%

Fig.3 illustrates the XRD pattern of the Ni converter slag.It is composed of mainly fayalite（Fe2Si O4）and spinel/magnetite（Fe3O4）phases.Micrographs of the converter slag are shown in Fig.4（a），which demonstrates that fayalite is present as the matrix，where discrete particles of spinel and matte/alloy are dispersed.An alkaline-bearing ferro-aluminosilicate phase（designated as Ns in Fig.4 （a）） is also identified.This silicate phase，which contains，on average，1.3wt%Na and 8.3wt%K，is likely attributable to the presence of alkaline-bearing gangue in the nickel sulfide ore/concentrate used in the smelting operations.The spinel particles，which have a melting point of 1863 K[20]，remained solid during converting and the subsequent slag-cleaning process，increasing the slag viscosity.On the basis of EDS analysis，the fayalite phase contains，on average，0.61wt%Ni and the spinel phase contains 0.98wt%Ni，both representing losses of Ni in oxide form.The matte phase has an average composition of 29.9wt%Ni，2.4wt%Co，0.4wt%Cu，33.3wt%Fe，and 34.0wt%S，representing metal loss in the entrained matte form.An interesting feature revealed in Fig.4（a）is that the majority of the matte/alloy particles are in close proximity to the spinel particles，indicating that the main mechanism of matte entrainment in the converter slag is by attachment of the matte or metal droplets to the solid spinel particles.Similarly，Cu matte droplets attaching to solid spinel particles slag has been reported to be one of the mechanisms for the physical entrainment of matte/metal in the molten slag[21–22].Figs.4（b）and 4（c）illustrate two matte/alloy particles surrounded by the spinel phase rather than by the fayalite matrix.The composition of the matte phase is highly dependent on the degree of sulfur removal.As evident in Fig.5，the content of Ni+Cu+Co increased from approximately 0wt%to approximately55wt%when the sulfur content decreased from 38wt%to30wt%.The compositions of the alloy phase are also plotted in Fig.5 for comparison.The elemental composition of the converter slag is shown in Table 2.