Method for recovering metal materials in waste ternary power batteries

Abstract

The invention relates to a method for recovering metal materials in waste ternary power batteries, and belongs to the technical field of battery material recovery and cyclic utilization. The method comprises the steps that positive and negative electrode mixed powder, phosphoric acid solution and the like react with each other, filtering is conducted to obtain a first solution; a potassium permanganate solution is added into the first solution for recovering manganese dioxide, a second solution is obtained, a butanone oxime solution is added into the second solution, butanone oxime nickel precipitation and a third solution are obtained, butanone oxime nickel is dissolved in hydrochloric acid, separating is conducted to obtain a fourth solution, and the fourth solution is subjected to electrodeposition to recover metal nickel; then mixed extractant is used for extracting cobalt ions in the third solution, separating is conducted to obtain an organic phase and a fifth solution, cobalt inthe organic phase is extracted by using sulfuric acid, a sixth solution is obtained, and the sixth solution is subjected to electrodeposition to recover metal cobalt; and a sodium carbonate solutionis added to the fifth solution, and lithium carbonate is recovered. The method for recovering the metal materials in the waste ternary power batteries adopts a mild and stable phosphoric acid-sodium bisulfite system; the multiple purification methods of precipitation, extraction and electrodeposition are used without interference to each other, and the separation effect is good; and the recoveredproducts have many types, and application is wide.

Description

technical field [0001] The invention relates to a method for recovering metal materials in waste ternary power batteries, and belongs to the technical field of battery material recovery and recycling. Background technique [0002] my country began to vigorously promote new energy vehicles in 2008, and the market scale expanded rapidly in 2014. By the end of 2016, the number of new energy vehicles had exceeded 1 million, and continued to show a rapid growth trend. The current vehicle power batteries are basically lithium-ion batteries, including lithium iron phosphate batteries, ternary batteries, lithium manganate batteries, etc. Among them, ternary material batteries have obvious advantages in improving the cruising range of new energy vehicles due to their high voltage platform, high energy density, and high tap density. They also have high discharge voltage, relatively large output power, and good low-temperature performance. Therefore, the proportion of ternary batteries...

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Problems solved by technology

In the process of using carbonate to precipitate lithium in this patent, the nickel-cobalt-manganese ternary precursor is not filtered in advance, which affects the precipitation effect of lithium; at the same time, the solubility of lithium carbonate decreases with the increase of temperature, and the reaction at room temperature Will cause a certain amount of lithium to fail to precipitate out

[0007] In addition, although the above process realizes the recovery of ternary batteries, nickel, cobalt, and manganese are all recovered in the form of ternary material precursors or ternary materials, and the product has a single function

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