A method for extracting nickel and cobalt from the phosphoric acid leaching solution of laterite nickel ore

Abstract

The invention relates to a method for extracting nickel and cobalt from phosphoric acid leaching solution of laterite nickel ore, belonging to the technical field of hydrometallurgy. The present invention comprises the following steps: (1): the laterite nickel ore is leached by phosphoric acid, and after solid-liquid separation, a stage of leachate enriched in nickel and cobalt is obtained; (2): an alkaline agent is added to the stage of leachate obtained in step (1) to adjust the solution pH, after solid-liquid separation, obtain the first impurity-removing liquid that has removed part of iron, aluminum, manganese and other impurity metal ions; (3): add extraction agent P204 to the first impurity-removing liquid obtained in step (2), Further separation and removal of impurity ions such as iron, aluminum, manganese, etc., to obtain a first-stage raffinate enriched in nickel and cobalt; (4): adding extraction agent P507 to the first-stage raffinate obtained in step (3), and separating nickel through multi-stage extraction and cobalt, eventually the cobalt remains in the organic phase and the nickel remains in the aqueous raffinate phase. The invention has the advantages of simple process, short process, few extraction stages, high recovery rate of nickel and cobalt, and is convenient for industrial application.

Description

technical field [0001] The invention discloses a method for extracting nickel and cobalt from phosphoric acid leaching solution of laterite nickel ore, belonging to the technical field of hydrometallurgy. Background technique [0002] Nickel is an important strategic metal resource, because of its excellent physical and chemical properties, it is widely used in steel, military industry, aerospace and battery and other fields. In recent years, with the country's strong support for the new energy industry and the rise of new energy vehicles, nickel, as one of the basic materials for new energy batteries, plays an important role in promoting the development of the national economy. [0003] Limonite-type lateritic nickel ore is suitable for wet treatment due to its high iron and low magnesium characteristics. The relative content of cobalt in this type of lateritic nickel ore is high. The wet process not only extracts nickel, but also recovers cobalt, which can meet the needs o...

AI Technical Summary

Problems solved by technology

P507 is stronger than P204 for Ni / Co separation, but it is difficult to separate high nickel and low cobalt solutions. P507 will co-extract Ca and produce CaSO during back extraction 4 Precipitation affects the operation, and the organic phase extraction of iron-containing P507 is difficult, which needs to be carried out in high-concentration HCl

Relatively speaking, Cyanex272 has the best extraction effect, but it is expensive, and part of Mg and Mn are co-extracted into the organic phase when extracting Co, and the impurity content in the cobalt-containing strip solution after back extraction is high

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