Abstract:To obtain the appropriate conditions for eliminating Fe³⁺ from NiSO₄ solution, the digestion solution of the clinker was used as raw material, which was obtained from roasting the nickel oxide ore with (NH₄)₂SO₄. The ammonium jarosite was successfully synthesized from the solution with analytic grade NH₄HCO₃. The effects of reaction temperature, reaction time, end pH value of reaction on the removal rate of iron were investigated, and the effect of the initial concentration of Fe³⁺ was also discussed. All of those factors had significant effects on the removal rate of Fe³⁺, among which the reaction temperature was the most prominent. The appropriate reaction conditions were concluded as follows: reaction temperature 95 °C, reaction time 3.5 h, end pH value of reaction 2.5 at initial concentration of Fe³⁺ 19.36 g/L. The physical aspect of (NH₄)₂Fe₆(SO₄)₄(OH)₁₂ was cluster figure composed of sheet or prismatic particles with smooth surface.

Key words: nickel oxide ore; ammonium jarosite; influence factor; digestion solution