A Study On The New Technology Of Comprehensive Extraction Of Nickel And Molybdenum From Ni-Mo Ore

A new process used to recover molybdenum and nickel from Ni-Mo ore by oxidation roasting with CaO addition, sulphation roasting, water leaching, extraction of molybdenum using anion exchange resin and extraction of nickel using cation exchange resin is proposed, which overcomes the flaw that molybdenum and nickel need to be extracted from Ni-Mo ore respectively in view of existing technique. The process has the advantages of short flow, high recovery of Ni and Mo as well as friendly environment.Mineral decomposition experimental results showed that 97.33% Mo and 93.16% Ni were extracted from the Ni-Mo ore by mixing 100g the raw Ni-Mo ore with 35g CaO, then oxidation roasting at 700℃for 2 h, sulphation roasting with 70 ml 98% sulphuric acid at 250℃for 2 h and water leaching at 98℃for 2 h with a liquid/solid ratio of 2:1.The experimental results showed that oxidation roasting with CaO could not only desulfurize effectively, reduce the pollution of the environment, but also decompose iron silicates and NiFe2O4,which can observably increase the extraction ratio of nickel. When the addition of CaO was 35g per 100g raw Ni-Mo ore, the adsorption of SO2 was 96.01%.The experimental results showed that molybdenum in leach solution in the pH range of 0.28-0.67 can be directly absorbed by anion exchange resin. The loading of Mo on the resin was found to be as high as 104.2 mg/mL wet resin when the breakthrough point of molybdenum was chosen as 0.2 g/L, and Mo adsorption ratio was 99.12%. The loaded resin with molybdenum was desorbed with 6mol/L NH3·H2O under the contact time for 60min at room temperature, and the desorption ratio of Mo was 98.21%.The results of neutralization process for deferrization of effluent showed that iron removal ratio exceeded 91% and the loss of nickel was less than 3% with one-off addition of CaCO3 powder till the pH increased to about 4. Adjust pH value in two steps can make iron removal ratio exceed 97% and the less ratio of nickel was less than 2%. The results of adsorption of nickel from deferrization solution using cation ion exchange resin showed that the adsorption capacity was 31.01mg/mL wet resin. Loaded resin with nickel was desorbed with 1mol/L H2SO4 under the contact time for 60min at room temperature, and the desorption ratio of Ni was 98%.