| Abstract Scope |
The crude nickel sulfate solution contains a high concentration of iron, which needs to be removed. This paper employs an oxidative precipitation method to achieve the preliminary removal of iron from crude nickel sulfate solution. The research includes constructing the φ-pH diagrams for Fe-H2O and Cl-H2O under theoretical conditions; using chlorine gas and hydrogen peroxide as oxidants to oxidize ferrous ions in the nickel sulfate solution for precipitation; and analyzing the crystal form of the iron slag under hydrogen peroxide treatment conditions. The study specifically examines the effects of different oxidation times, aging times, amounts of hydrogen peroxide, and the removal efficiency of iron from nickel sulfate solutions with varying iron content. Experimental results indicate that under optimized conditions, using chlorine as the oxidant with an oxidation time of 60 minutes and an aging time of 90 minutes, the iron removal rate reached 98.65%; using hydrogen peroxide as the oxidant with an oxidation time of 30 minutes and an aging time of 30 minutes, the iron removal rate reached 98.08%. This study demonstrates an effective method for the preliminary removal of iron from crude nickel sulfate solutions, significantly reducing iron content and providing a raw material for the subsequent purification and enhancement of nickel sulfate solution. |