Method for treating wastewater in the spherical nickel hydroxide production process

A method for treating wastewater generated during a spherical nickel hydroxide production process having an extraction stage, a filtering stage and an elution stage, the wastewater treatment method characterized by comprising the following steps:

• a. introducing raffinate from an extraction stage in the spherical nickel hydroxide production process into a primary membrane concentration and filtration system (1), which outputs primary concentrate and primary clear liquid after concentrating and filtering the raffinate;
• b. introducing spherical nickel hydroxide mother liquid from a filtering stage in the spherical nickel hydroxide production process into a secondary membrane concentration and filtration system (2), which outputs secondary concentrate and secondary clear liquid after concentrating and filtering the spherical nickel hydroxide mother liquid;
• c. introducing spherical nickel hydroxide eluent from an elution stage in the spherical nickel hydroxide production process into a tertiary membrane concentration and filtration system (3), which outputs tertiary concentrate and tertiary clear liquid after concentrating and filtering the spherical nickel hydroxide eluent;
• d. introducing the primary concentrate output in Step a into an evaporation system (5);
• e. introducing the secondary concentrate output from the secondary membrane concentration and filtration system (2) in Step b and the tertiary concentrate output from the tertiary membrane concentration and filtration system (3) in Step c into an ammonia recovery system (4) for ammonia recovery, said ammonia recovery system to output a residual liquid;
• and
• f. introducing the residual liquid from the ammonia recovery system (4) in Step e into the evaporation system (5).