Method for preparing high-purity nickel salt from ferro-nickel alloy

• Main Authors: LIU CHENG, WANG KUITING, DING JIAN, LI YONG, SUN NINGLEI, LIU GUO, YIN SHUYAN
• Format: Patent
• Language: Chinese; English
• Published: 25.07.2023
• Subjects: CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; INORGANIC CHEMISTRY; METALLURGY

The invention discloses a method for preparing high-purity nickel salt by using a nickel-iron alloy, which comprises the following steps: adding a sulfur-containing reagent and an oxidizing agent into nickel-iron alloy powder slurry for catalytic oxygen leaching treatment to obtain ore pulp containing nickel sulfate and iron oxide; oxidizing the ore pulp, then neutralizing, precipitating and removing iron, and carrying out solid-liquid separation to obtain a nickel sulfate-containing solution and leaching residues; carrying out deep impurity removal on the nickel sulfate-containing solution, and then extracting and purifying; and carrying out evaporative crystallization on the extraction raffinate to obtain nickel sulfate. According to the method, the leaching selectivity can be improved from the source, and the nickel-containing solution completely meeting the extraction requirement is prepared under the condition that the consumption of a neutralizing agent in the whole process is reduced by separating the