| 摘要 |
FIELD: chemical technology. ^ SUBSTANCE: invention relates to the improved method for preparing nickel oxalate that can be used in preparing catalysts, ceramic materials and in manufacturing electric vacuum devices. Method involves preparing the reaction solution containing nickel (II) and oxalate, crystallization of product, separation of precipitate from solution and its drying. The reaction solution is prepared by mixing reagent as source of oxalate and spent solution from chemical nickel plating taken in the amount providing the mole ratio in the reaction solution nickel (II) : oxalate = 1.0:(0.8-2.8). Spent solution of chemical nickel plating contains as main components nickel (II), ligand for nickel (II), reducing agent and product of its oxidation. As spent solution of chemical nickel plating method involves using solution containing nickel (II), ligand for nickel (II), hypophosphite, phosphite as main components and pH value in the reaction solution is brought about from 2.5 to 7.5. As spent solution of chemical nickel plating method involves using solution containing nickel (II) and ligand for nickel (II) as main components. As a reducing agent method involves using substance taken among the group including hydrazine, borohydride, hydrazine borane, alkylaminoborane, dithionite, hydroxymethyl sulfinate, thiourea dioxide, product of reducing agent oxidation and pH value in the reaction solution is brought about 0.0 to 8.5. Invention provides reducing material consumptions for preparing nickel oxalate, expanded assortment of materials used for preparing nickel oxalate, utilization of manufacture waste, reduced cost of product and simultaneous utilization of the spent solution of chemical nickel plating representing toxic waste of manufacturing. ^ EFFECT: improved method for preparing. ^ 16 cl, 19 ex |
