Advanced treatment and recovery method of residual extraction waste water for nickel-cobalt manufacturing enterprises

Abstract

The invention provides an advanced treatment and recovery method of residual extraction waste water for nickel-cobalt manufacturing enterprises. The residual nickel-cobalt concentration of the residual extraction waste water after primary precipitation is 1.0-5.0mg / l, and the concentration of organic compounds OiL is smaller than or equal to 20mg / l; after primary precipitation, the temperature of the residual extraction waste water is 25-50 DEG C, the pH value of the residual extraction waste water is below 6.0-8.5, an adsorption reaction is performed through an adsorption column filled with active manganese oxide, or in a single-groove quantitative intermittent type stirring manner, or in a multiple-groove parallel continuous stirring manner, the liquid to solid ratio of the residual extraction waste water to active manganese oxide powder is 500:(1-5), the adsorption time is 20-40 minutes, after adsorption, filtration is performed, and filtered water is industrial waste water which can reach a drainage standard; an ammonia solution of 8.0-12.0% is used for washing manganese oxide powder residues which are obtained through filteration in the step (2) and are loaded with nickel and cobalt, backwash liquor of nickel and cobalt is eluted so that the nickel and the cobalt are recovered, and the eluted manganese oxide is rinsed and regenerated.

Description

technical field [0001] The invention relates to a chemical wastewater treatment technology, in particular to a method for advanced treatment and recovery of raffinate sewage in the nickel-cobalt hydrometallurgy industry by using an adsorption material, and belongs to the technical field of environmental governance and resource regeneration projects. Background technique [0002] In the nickel and cobalt hydrometallurgical production process, P 507 After extraction and separation of nickel and cobalt by the extractant, the raffinate water still contains a small amount of nickel and cobalt ions. If this is not effectively recovered, it will not only waste limited resources but also inevitably pollute the surrounding environment after discharge; for this reason, related companies usually The best treatment and recovery method is to precipitate nickel and cobalt ions into hydroxides or sulfides with liquid caustic soda, lime or soda sulfide and then filter. Although this process...

AI Technical Summary

Problems solved by technology

[0002] In nickel and cobalt hydrometallurgical production process, with P 507 After extraction and separation of nickel and cobalt by the extractant, the raffinate water still contains a small amount of nickel and cobalt ions. If this is not effectively recovered, it will not only waste limited resources but also inevitably pollute the surrounding environment after discharge; for this reason, related companies usually The best treatment and recovery method is to precipitate nickel and cobalt ions into hydroxides or sulfides with liquid caustic soda, lime or soda sulfide and then filter. Although this process is simple, reliable and easy to implement, the filtered sewage still contains 1.0 to 5.0 Nickel and cobalt of about mg / l are difficult to completely precipitate and recover. In order to meet the national sewage standards, most enterprises have to add other fresh water for dilution, resulting in the waste of fresh water and the expansion of industrial sewage water.