Nickel recovery loss reduction method, hydrometallurgical method for nickel oxidized ore, and sulfuration treatment system

摘要

Provided are a nickel recovery loss reduction method capable of reducing nickel recovery loss by lowering the concentration of fine floating solid contents in overflow liquid in precipitation separation treatment to thereby enable further improvement in nickel recovery rate, a hydrometallurgical method for nickel oxidized ore to which the nickel recovery loss reduction method is applied, and a sulfuration treatment system. The present invention is a nickel recovery loss reduction method in a sulfuration step for blowing hydrogen sulfide gas into a nickel-containing sulfuric acid aqueous solution to generate nickel-containing sulfides and a barren solution, and the nickel-containing sulfides with the average particle size adjusted to a predetermined size or larger are added as seed crystals to the sulfuric acid aqueous solution. It is more preferable to adjust the average particle size of the nickel sulfides to be added as seed crystals to 55 μm or more.