Recovery system and recovery method of nickel-cobalt hydroxide

Abstract

The invention discloses a nickel-cobalt hydroxide recovery system and method, the recovery system comprises a reaction kettle washing water recovery system, a centrifugal dewatering mother liquor recovery system, a recovery tank, a supernatant recovery system and a solid recovery system, a feed inlet of the recovery tank is respectively communicated with the reaction kettle washing water recovery system and the centrifugal dewatering mother liquor recovery system; the supernate outlet is communicated with the supernate recovery system, and the discharge port of the recovery tank is communicated with the solid recovery system. According to the recycling method disclosed by the invention, the reaction kettle washing water and the dewatering mother liquor are independently recycled into the recycling tank, the nickel-cobalt hydroxide is recycled, the recycled nickel-cobalt hydroxide is low in impurity content, and the recycled nickel-cobalt hydroxide is returned to the processes of filter pressing, washing, centrifugal dewatering, flash drying, screening for iron removal and packaging of the product, so that the product quality is improved. The method not only can improve the final yield of the nickel-cobalt hydroxide, but also can save energy consumption, shorten the recovery process and improve economic benefits.

Description

Technical field [0001] The present invention relates to the field of hydroxide recovery in nickel-cobalt hydroxide production, specifically to a nickel-cobalt hydroxide recovery system and recovery method. Background [0002] The production process of nickel-cobalt hydroxide is: (1) nickel sulfate solution and cobalt sulfate solution preparation binary liquid; (2) binary liquid, ammonia water, liquid alkali co-precipitation reaction; (3) filtration, washing; (4) centrifugal dehydration, flash drying; (5) screening, iron removal, packaging. After the end of the reaction, after the discharge of the reaction liquid, the reactor wall and the stirring paddle will remain a good reaction of nickel cobalt hydroxide, cleaning the washing water of the reaction kettle will eventually be transferred to the mother liquor collection tank, the current recovery process is to collect all the waste liquid in the entire production process into the mother liquor collection tank, and then through the...

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Problems solved by technology

[0003] The recovery method of the waste liquid in the prior art is simple to operate, but because there are many other substances in the recovery liquid except nickel-cobalt hydroxide, it is impossible to filter the solid obtained from the recovery liquid as the nickel-cobalt hydroxide products, so it can only be treated by acid-dissolving method, and acid-dissolving needs to consume a large amount of sulfuric acid, and the solution after acid-dissolving returns to the first step of the process, and needs to participate in the co-precipitation reaction again, consuming liquid alkali, ammonia water, and steam And other reaction materials, the whole recycling process consumes a lot of auxiliary materials and high energy consumption

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