Method for recycling hydrochloric acid in P204 ferric chloride solution

Abstract

The invention discloses a method for recycling hydrochloric acid in a P204 ferric chloride solution. According to the method, acidic resin SQD-74 with high targeting capability is used and has a goodadsorption effect on Fe, Cu and Zn in a replaced ferric chloride solution and a weak adsorption effect on H+ and other metal such as Co and Mn; an exchanged solution is not large in acidity change, contains less Fe, Zn and the like and is used for preparing cobalt washing acid and returning P204 for extraction and recycling, and Cu and Mn form an open loop at a copper-washing section; for the resin after being subjected to adsorption saturation, pure water can be used for precipitating metal ions, and the resin is recycled after being precipitated by pure water and regenerated; a produced precipitate solution is returned to an iron residue washing system, the consumption of acid and new water for production is reduced, impurities of the resin of the P204 ferric chloride solution are removed, hydrochloric acid of the P204 ferric chloride solution is recycled, the pressure for waste water treatment in a system and the production cost for extraction are reduced, and the iron removal ratecan reach 98% or above. The method is simple in process flow, convenient to operate and suitable for industrial large-scale production.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metallurgy, and in particular relates to a method for recovering hydrochloric acid from a P204 ferric chloride solution for reuse. Background technique [0002] In the cobalt production process, the P204 extractant is used for extraction and removal of impurities. The extraction box generally includes a saponification section, an extraction section, a cobalt washing section, a copper-manganese washing section, and an iron washing section. Among them, 6N hydrochloric acid is mainly used to wash the organically loaded Fe. , When the concentration of the washed hydrochloric acid is reduced to about 5.0N, the acid is changed, and the ferric acid after the acid change is directly returned to the pulping process in the form of cobalt-containing wastewater for treatment. At present, the P204 ferric acid treatment method mainly has the following problems: [0003] 1. The ferric acid for extraction and...

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Problems solved by technology

[0004] 2. From the perspective of production organization process, it is easy to increase the pressure of wastewater treatment in the system

[0005] 3. The on-site environment of the pulping post is poor when the ferric acid is washed and returned to the pulping process

[0006] 4. Wash the solution Cl after ferric acid treatment - If the content is too high, the solution will be highly corrosive, which will easily cause equipment failure and increase the production cost of cobalt products

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