Roasting of Nickel Sulfide (2nd Report)

Abstract

Nickel sulfate, oxide and residual sulfide in roastig products of Ni₃S₂ were estimated and soluble nickel in roasted products by dilute sulfuric acid were determined. These results indicate the furnace temperature higher than 900°C and long time are needed to achieve a perfect oxidation of Ni₃S₂. Rate of dissolution of dead roasted products by dilute sulfuric acid is slower than that of oxides prepared at low temperatures. The decrease of NiSO₄ in roasted products at about 700°C is attributed to the mutual reaction between Ni₃S₂ and NiSO₄.