Experimental Study for Copper Removal from Anode Solution of Nickel Electrolysis (I)

1、 Determination of copper nickel separation coefficient of extractant

Using chloroform as the diluent, prepare the extractant of Example 1 into a 10g/L solution as the organic phase. Weigh a certain amount of copper chloride and nickel chloride respectively, add a certain amount of sodium chloride, adjust the pH value of the solution with hydrochloric acid or sodium hydroxide, and prepare copper chloride and nickel chloride solutions with metal ion concentration of 1.0g/L, chloride ion concentration of 75g/L, and pH value of 4-4.5 as the extracted water phase. Under extraction conditions of 25 ℃ and 1:1 ratio (O/A), the organic and aqueous phases were poured into a 100ml conical flask, stirred in a constant temperature magnetic stirrer for 30 minutes, and then placed in a separating funnel for layering to obtain the residual solution and the loaded organic phase. Measure the concentration of metal ions in the extracted aqueous phase and residual solution using ICP-AES method. Calculate the distribution ratios of copper chloride and nickel chloride using the subtraction method.

Using chloroform as the diluent, prepare the extractant of Example 1 into a 10g/L solution as the organic phase. Weigh a certain amount of nickel sulfate, add a certain amount of sodium sulfate and sodium chloride, adjust the pH of the solution with sulfuric acid or sodium hydroxide, and prepare a nickel sulfate solution with a nickel ion concentration of 1.0g/L, sulfate ion concentration of 100g/L, chloride ion concentration of 75g/L, and pH value of 4-4.5 as the extracted water phase. Under extraction conditions of 25 ℃ and 1:1 ratio (O/A), the organic and aqueous phases were poured into a 100ml conical flask, stirred in a constant temperature magnetic stirrer for 30 minutes, and then placed in a separating funnel for layering to obtain the residual solution and the loaded organic phase. Measure the concentration of metal ions in the extracted aqueous phase and residual solution using ICP-AES method. Calculate the distribution ratio of nickel sulfate using the subtraction method.

The concentrations of metal ions in the extracted water phase were measured by ICP-AES method as Cu2+1080mg/L, Ni2+1120mg/L, and Ni2+987mg/L. Similarly, the concentrations of metal ions in the raffinate were measured to be Cu2+21.7mg/L, Ni2+1092.8mg/L, and Ni2+924.2mg/L, respectively. The distribution ratios of copper chloride, nickel chloride, and nickel sulfate were calculated to be 48.67, 0.024, and 0.068, respectively; The separation coefficients of copper and nickel for copper chloride and nickel chloride, copper chloride and nickel sulfate are 2027 and 716, respectively.

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