Method of extracting nickel and cobalt from phosphoric acid leaching solution of laterite-nickel ores

Abstract

The invention relates to a method of extracting nickel and cobalt from a phosphoric acid leaching solution of laterite-nickel ores and belongs to the technical field of hydrometallurgy. The method comprises the following steps of (1) leaching the laterite-nickel ores by phosphoric acid, and carrying out solid-liquid separation to obtain a section of leaching solution rich in nickel and cobalt; (2)adding an alkaline agent into the section of leaching solution obtained in the step (1) to adjust the pH of the solution, and carrying out solid-liquid separation to obtain a first impurity removal solution without impurity metal irons such as iron, aluminum and manganese; (3) adding an extraction agent P204 into the first impurity removal solution obtained in the step (2) to further remove impure irons such as iron, aluminum and manganese to obtain a section of raffinate rich in nickel and cobalt; and (4) adding an extraction agent P507 into the section of raffinate rich obtained in the step(3), and separating nickel from cobalt by means of multi-stage extraction, wherein cobalt is reserved in an organic phase and nickel is reserved in a raffinate aqueous phase finally. The method is simple in process, short in flow, few in extraction stage, high in nickel and cobalt recovery rate and 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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