Synthetic Diamond Pickling Catalyst Waste Nickel, Cobalt, Manganese Recovery Study

A process is adopted to recover the metal values in the typical nickel and cobalt containing waste with high manganese content, named a kind of acid waste solution originated from the artificial diamond industry. The valuable metals in the waste are reclaimed through the course of primary purification-purification through solvent extraction by P204-separation of nickel and cobalt through solvent extraction by P507-manufacturing of nickel and cobalt products.An approach is developed to evaluate the separation efficiency of manganese in the aqueous system of Ni(ⅡⅢ)-Co(Ⅱ)-Mn(Ⅱ)-NH₃-CO₃^2--H₂O. Based on the new approach, a mathematical model is established, followed by the visual simulation with the matlab software. Tdfectively by the addition of the mixture of (NH₄)₂SO₄, NH₄HCO₃ and ammonia. Experiments are carried out to confirm the analysis results from the mathematical modeling and to optimize the process parameters.The treatment of the waste solution after separation of manganese is studied. The theoretical analysis and experimental research determine the process of evaporating the ammonia with the addition of NaOH, removing manganese through three-stage counter current solvent extraction by P204, separating nickel and cobalt through three-stage counter current solvent extraction by P507 to prepare high-quality NiSO₄ and CoCl₂. The analysis result of the systematic experiments concludes the appropriate parameters to produce performance-stable oxalate salts and high-quality metallic powders.