Method for separating cobalt, nickel and magnesium from nickel oxide ore pickle liquor

Abstract

The invention discloses a method for separating cobalt, nickel and magnesium from nickel oxide ore pickle liquor. The method comprises the following steps that the pickle liquor on which iron removing operation is carried out is arranged in a stirring kettle, the pickle liquor contains cobalt, nickel and magnesium, magnesium oxide water-based slurry is added, the mass concentration of magnesium oxide in the magnesium oxide water-based slurry is controlled to be smaller than or equal to 80%, and the dosage of magnesium oxide is 0.001-0.01 time of the mass of nickel oxide ore pickle liquor; the stirring reaction is carried out till thorough deposition, filtering and separating are carried out to obtain filter residues and filter liquor, and the filter liquor is fed in the pickle liquor treatment procedure to prepare magnesium oxide for repeated utilization; after being dissolved through dilute acid, the filter residues are introduced into an extraction system, extraction separation is carried out through a mixing extraction agent, a solution containing nickel sulfate and cobaltous sulfate is obtained at an outlet of an extraction trough and an outlet of a reverse extraction trough, and after reverse extraction is carried out on the mixing extraction agent through dilute acid, the mixing extraction agent returns to the extraction trough to be circularly utilized. According to the method, complete separation of cobalt, nickel and magnesium is achieved, saponification of the extraction agent is not needed, the cobalt and nickel separation efficiency is high, the consumption of a reagent is low, and the separation cost is low.

Description

Technical field

[0001] The invention relates to a nickel ore smelting method, in particular to a method for separating cobalt, nickel and magnesium in an acid leaching solution of nickel oxide ore. Background technique

[0002] The acid leaching process is a common technique for smelting nickel oxide ore, and the sulfuric acid leaching process is widely used in the wet smelting of nickel oxide ore. In addition to nickel and cobalt, nickel oxide ore also contains metal elements such as iron, magnesium, and aluminum. The sulfuric acid leaching of nickel oxide ore is a leachate containing metal ions such as iron, aluminum, magnesium, nickel, and cobalt, which must be separated to obtain metals such as nickel and cobalt and their compounds. For the separation of metal ions in the acid leaching solution of nickel oxide ore, iron and aluminum ions are usually separated first by precipitation, and then nickel, cobalt, and magnesium ions are further separated.

[0003] Solvent extraction...

Images