A METHOD FOR PREPARATION OF HIGH PURITY NICKEL SULFATE CRYSTAL

摘要

The method relates to a method for producing high purity nickel sulfate crystals using waste nickel anode, and after processing the nickel nickel anode to produce nickel chips, sulfuric acid is added in 4 equivalent ratio or more, and water is added and stirred in the same volume as sulfuric acid. After reacting at a temperature of 100 ° C. or higher to form nickel sulfite powder, it is filtered and the filtered nickel sulfite powder is washed with water and slurried. Thereafter slurried the sulfur nickel powder impurities to form a nickel sulfate by oxidation by introducing the hydrogen peroxide solution in the same equivalent ratio more than the amount to inject NiCO ₃ or Ni (OH) ₂ to nickel sulfate to adjust the pH of the solution to a hydroxide After precipitation and crystallization, the nickel sulfate solution from which impurities are removed is crystallized to prepare nickel sulfate crystals of high purity using a waste nickel anode.;By the above method, high-purity nickel sulfate is produced using waste nickel without generating nox gas, which is usable as an electroplating solution.