Method for recovering cobalt in cobalt chloride wastewater based on two-stage resin separation

Abstract

The invention discloses a method for recovering cobalt in cobalt chloride wastewater based on two-stage resin separation, and belongs to the technical field of water treatment. According to the method, organic matters and metal impurities in the cobalt chloride wastewater are removed through a two-stage resin adsorption process, so that the purpose of deeply purifying the cobalt chloride solution is achieved. The method comprises the following specific steps: (1) filtering wastewater through a filtering device to remove fine particles and colloidal substances; (2) introducing effluent in the step (1) into a first-stage resin adsorption tower, and removing organic matters in the wastewater; (3) introducing primary resin effluent in the step (2) into a secondary resin adsorption tower, and removing metal ions in the wastewater; and (4) after the resin in the steps (2) and (3) is saturated by adsorption, carrying out regeneration treatment. The continuous and recycling treatment of the cobalt chloride solution and the desorption solution is realized, the treatment cost is reduced, and the treatment effect is enhanced by utilizing hydraulic power.

Description

technical field [0001] The invention relates to the technical field of water treatment, more specifically, to a method for recovering cobalt from cobalt chloride wastewater based on two-stage resin separation. Background technique [0002] As an important strategic mineral resource, cobalt is widely used in industries such as aerospace, machinery manufacturing, electrical appliances, magnetic materials, and ceramics because of its high temperature resistance, corrosion resistance, high strength, and high magnetism. Social development is of great significance. As a cobalt-containing compound, cobalt chloride is also widely used in industries such as instrument manufacturing, ceramics, coatings, animal husbandry, brewing, and national defense. Cobalt is mostly produced as an associated metal due to its inherent duality of iron and sulfur. At present, industrial cobalt is mainly obtained from by-products recovered from the processing of copper, nickel, iron and other minerals...

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Problems solved by technology

Among them, the amount of reagent consumed by the precipitation method is too large, and when the concentration of Cd is too low, it cannot be completely removed, and at the same time, the loss of the main metal Co is also large; the reduction replacement needs to consume a large amount of cobalt powder, and the operating cost is too high; the extraction method requires Multi-stage extraction can be used to remove impurities in depth, the operation is complicated, and the organic phase is easy to be mixed in the solution; the ion exchange method has a significant effect on the separation and removal of cobalt and cadmium in the chloride system, because cobalt and cadmium are contained in acidic systems. There are morphological differences in the chloride ion solution, and an anion exchange resin can be used to adsorb and remove CdCl 5 3-

[0004] If the cobalt solution contains substances such as extractant or kerosene, it will have an adverse effect on the subsequent deep purification treatment of the cobalt solution, and at the same time, it will also cause "long dark spots" on the surface of the cobalt-based material

The traditional degreasing method is to use activated carbon adsorption, but the adsorption capacity of activated carbon in the aqueous solution system is limited, and the activated carbon after adsorption saturation is a hazardous solid waste and requires special treatment

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