Wet cobalt extraction raffinate waste liquid treatment method and prepared solution for ternary precursor preparation

Abstract

The invention provides a wet cobalt extraction raffinate waste liquid treatment method and a prepared solution for ternary precursor preparation, and relates to the technical field of metallurgical waste liquid treatment. The treatment method comprises the following steps: firstly, carrying out sulfuration reaction on the wet-process cobalt extraction raffinate waste liquid and sodium sulfide, and then carrying out solid-liquid separation to obtain sulfuration precipitate enriched with cobalt and nickel; and leaching the sulfurized precipitate and manganese dioxide by using a sulfuric acid solution with the pH value of 0.5-1.0 to finally obtain a solution which contains nickel sulfate, manganese sulfate and cobalt sulfate and is used for preparing the ternary precursor. The treatment method has the advantages that equipment is simple, the treatment process is easy to operate, and the solution prepared from the obtained ternary precursor is high in concentration and can be directly used for preparing the ternary precursor, compared with an existing method for treating the wet cobalt extraction raffinate waste liquid by using an extraction method or an ion exchange method, the method can be completed only by using common equipment of a hydrometallurgy chemical plant, the operation process is simple, and the economical efficiency is higher.

Description

technical field [0001] The invention relates to the technical field of metallurgical waste liquid treatment, in particular to a treatment method for waste liquid of cobalt extraction by wet method and the prepared solution for the preparation of ternary precursor. Background technique [0002] At present, in the hydrometallurgical process of cobalt, most manufacturers choose P507 as the extraction agent of cobalt, but the separation coefficient of P507 for nickel and magnesium is low, so nickel and magnesium can only enter the raffinate, thus forming a large amount of Acid wastewater with low concentration of valuable metals (Ni, Co). Because in cobalt hydrometallurgy, P204 is usually used to remove iron, zinc, aluminum, calcium and other common impurities before P507 extraction, so the main component of the wastewater is sodium sulfate, a small amount of magnesium sulfate, a small amount of nickel sulfate, and a small amount of sulfuric acid Cobalt, in addition, there may ...

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Problems solved by technology

[0003] For the above-mentioned acidic raffinate waste liquid containing low concentration of cobalt and nickel, there are certain shortcomings in the existing recovery and treatment methods.

For example: Disadvantages of high-pressure leaching: high-pressure leaching sulfide precipitation method has high requirements for equipment, and high-pressure equipment has certain dangers

For a small amount of nickel sulfide treatment, the cost of new high-pressure equipment and the high temperature required for the reaction is too large

Disadvantages of ion exchange resin: the acid wastewater containing low concentration of cobalt and nickel can be directly treated by using ion exchange resin, and the nickel and magnesium in it can be separated to obtain magnesium sulfate solution

However, the disposable equipment input cost of this method is relatively high, and the concentration of nickel sulfate solution obtained at the same time is low, which increases the difficulty of subsequent treatment and use.

Disadvantages of C272 extraction method: the use of C272 extractant can directly separate nickel and magnesium, but in the process of separating nickel and magnesium, C272 mainly extracts the magnesium in the nickel and magnesium solution to achieve the purpose of separation, but the nickel and magnesium solution In, nickel ion concentration is low (0.5~10g / L), so even after removing Mg ion, the low nickel sulfate solution that obtains also can't directly prepare nickel sulfate basically; Also cannot be used as nickel sulfate solution

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