摘 要: | As a part of the fundamental study related to the reduction smelting of spent lithium-ion batteries and ocean polymetallic nodules based on MnO–SiO2slags,this work investigated the activity coefficient of NiO in SiO2-saturated Mn O–Si O2slag and Al2O3-saturated Mn O–SiO2–Al2O3slag at 1623 K with controlled oxygen partial pressure levels of 10-7,10-6,and 10-5Pa.Results showed that the solubility of nickel oxide in the slags increased with increasing oxygen partial pressure.The nickel in the Mn O–Si O2slag and Mn O–Si O2–Al2O3slag existed as Ni O under experimental conditions.The addition of Al2O3in the Mn O–Si O2slag decreased the dissolution of nickel in the slag and increased the activity coefficient of Ni O.Furthermore,the activity coefficient of Ni O(γN_(i O)),which is solid Ni O,in the Si O2saturated Mn O–Si O2slag and Al2O3saturated Mn O–Si O2–Al2O3slag at 1623 K can be respectively calculated asγN_(i O)=8.58w(Ni O)+3.18 andγN_(i O)=11.06w(Ni O)+4.07,respectively,where w(Ni O)is the Ni O mass fraction in the slag.
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