Method for extracting high-purity scandium oxide from scandium-containing nickel-cobalt hydroxide through short process

Abstract

The invention discloses a method for extracting high-purity scandium oxide from scandium-containing nickel-cobalt hydroxide through a short process. The method comprises the following steps: curing and leaching scandium-containing nickel-cobalt hydroxide by using concentrated sulfuric acid to obtain scandium-containing nickel-cobalt leachate; performing scandium extraction treatment on the scandium-containing nickel cobalt leaching solution by using an organic extraction agent to obtain a nickel cobalt sulfate solution and a scandium-containing organic phase; performing countercurrent washing on the scandium-containing organic phase by using a detergent to obtain a washing solution and a purified scandium-containing organic phase; subjecting the purified scandium-containing organic phase to first countercurrent reverse extraction treatment through a first reverse extraction agent, so as to obtain first scandium-containing reverse extraction liquid and a first reverse extraction organic phase; performing second countercurrent reverse extraction treatment on the first reverse extraction organic phase by using a second reverse extraction agent to obtain second scandium-containing reverse extraction liquid and a second reverse extraction organic phase; respectively carrying out scandium precipitation treatment on the first scandium-containing reverse extraction liquid and the second scandium-containing reverse extraction liquid by using oxalic acid to obtain scandium oxalate precipitate; and calcining the scandium oxalate precipitate to obtain scandium oxide. By adopting the method, scandium oxide with the purity of 99.99% can be extracted.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a short-flow method for extracting high-purity scandium oxide from scandium-containing nickel-cobalt hydroxide. Background technique [0002] The raw materials of nickel-cobalt hydroxide used in the production of ternary cathode material precursors are rich in scandium oxide, which can be used as a raw material to effectively prepare scandium oxide, so that the rare and valuable element resources can be comprehensively recovered, which is beneficial to scandium extraction and The application has very great practical significance. When using this nickel-cobalt hydroxide to prepare the ternary precursor material, the P204 extractant is generally used to extract and enrich the scandium element in the waste liquid, and then separate and purify it. However, the P204 extractant is easy to emulsify and difficult to back-extract. The associated thorium, titanium, zirconium, rare ear...

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Problems solved by technology

When using this nickel-cobalt hydroxide to prepare the ternary precursor material, the P204 extractant is generally used to extract and enrich the scandium element in the waste liquid, and then separate and purify it. However, the P204 extractant is easy to emulsify and difficult to back-extract. The associated thorium, titanium, zirconium, rare earth and other elements are difficult to separate, the process is long, the recovery rate of scandium is low, and the production cost is high; and the purity of scandium oxide obtained is difficult to reach 99.99%, only 99.9%. and other elements are relatively high, which cannot meet the requirements of high-end fields such as solid oxide fuel cells (SOFC), high-purity metal scandium, laser materials, etc., and further improvement of the purification process is required, and the purification process is increased, the operation is complicated, the process is long, and the cost higher

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