Method for efficiently separating valuable metal from mixed solution containing nickel, cobalt, manganese and lithium

Abstract

The invention discloses a method for efficiently separating valuable metal from a mixed solution containing nickel, cobalt, manganese and lithium. The method comprises the steps: (1) the mixed solution containing the nickel, the cobalt, the manganese and the lithium, and an alkaline solution are simultaneously added into a reaction still loaded with underflow to be subjected to a precipitation reaction, heating and stirring are kept, and the adding speed of the mixed solution containing the nickel, the cobalt, the manganese and the lithium, and the alkaline solution is controlled to control the pH value of a solution to be 8-14; (2) after the mixed solution containing the nickel, the cobalt, the manganese and the lithium is added completely, the alkaline solution is added continuously to control the pH value of slurry to be stabilized to be 10-12, the alkaline solution stops being added, and heat preservation and stirring are carried out for an aging reaction; and (3) the aged slurry in the step (2) is subjected to solid-solution separating to obtain precipitated residues and a precipitated mother solution, the obtained precipitated residues are mixtures of nickel-cobalt-manganesehydroxides and oxides, and the obtained precipitated mother solution is a lithium-enriching solution. According to the method, the recovering rates of the nickel, the cobalt, the manganese and the lithium in the mixed solution containing the nickel, the cobalt, the manganese and the lithium are all larger than 99%.

Description

technical field [0001] The invention belongs to the field of separation of nonferrous metals, in particular to a method for separating valuable metals from a mixed solution containing nickel, cobalt, manganese and lithium. Background technique [0002] Waste lithium-ion batteries are rich in valuable metal resources such as nickel, cobalt, manganese and lithium, and the clean recycling of waste lithium-ion batteries has become a research hotspot in the lithium battery industry. At present, regardless of the fire method or the wet method, the separation of nickel, cobalt, manganese and lithium will be faced. [0003] At present, there are three main technical routes for the separation of nickel, cobalt, manganese and lithium: one is the separation of manganese and lithium into slag during pyroprocessing, and the reduction of nickel and cobalt into metal and alloy. In the process of leaching, extraction and recovery, the treatment process is long, and there are problems of lo...

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Problems solved by technology

[0003] At present, there are three main technical routes for the separation of nickel, cobalt, manganese and lithium: one is the separation of manganese and lithium into slag during pyroprocessing, and the reduction of nickel and cobalt into metal and alloy. In the process of leaching, extraction and recovery, the treatment process is long, and there are problems of low yield of valuable metals and high energy consumption in the process; second, in the process of wet treatment, lithium is preferentially deposited chemically, and lithium is usually separated preferentially in the form of lithium fluoride. The method often introduces a large amount of fluoride ions, and the precipitation rate of lithium is lower than 80%, which causes the recovery rate of lithium to be too low; the third is to preferentially extract and separate nickel, cobalt and manganese from the mixed solution, and the conventional step-by-step extraction and separation method often produces a large amount of high sodium Wastewater, with progressive dispersion loss of lithium during the separation process

The above three methods can achieve effective separation of nickel, cobalt, manganese and lithium to a certain extent, but there are problems such as low element separation rate and low recovery rate of valuable metals. The above problems have become the key to restricting the clean recycling of waste lithium-ion batteries technical problem

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