| 摘要 |
TWO-STAGE IRON REMOVING METHOD FOR SOLUTIONS OBTAINED FROM ACID LEACHING OF NICKEL OXIDE ORES A two-stage iron removing method for a solution obtained from acid leaching of a nickel oxide ore, the method including: adding a garnierite slurry to a leach solution of a nickel oxide ore, stirring until the garnierite is completely dissolved and a pH value of a resulting solution reaches >1.6, conducting liquid-solid separation; heating an obtained liquid to a temperature of 130-170 0C, stirring for 1-3 hours, conducting liquid-solid separation and drying a resulting solid whereby yielding a hematite product; adding the garnierite slurry for a second time to a collected liquid, stirring for a certain time until the garnierite is completely dissolved and the pH value of a resulting solution is approximately 2, conducting liquid-solid separation; and adding magnesium oxide and an oxidant or only adding an oxidant to a resulting liquid, stirring for 0.5-4 hours, conducting liquid-solid separation, and drying the solid whereby yielding a goethite product. Solutions obtained from acid leaching of nickel oxide ores Stirred tank Liquid-solid Solid A separation Garierite slurry Liquid A The first iron Preparing silica removal [ product Liquid-solid Solid B separation Drying Liquid B Hematite 10 Stirred tank Liquid-solid Solid C Storage of product separation Liquid C Magnesium _0 Magnesium The second iron Oxidant sulfate oxide removal Separating nickel, Liquid D Liquid-solid Solid D cobalt, aluminum separating and magnesium sprto Nickel product, cobalt product Goethite and magnesium product |
