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

A laterite nickel ore and leachate technology, applied in the field of hydrometallurgy, can solve the problems of P507 organic reverse extraction, difficulty in separation of high-nickel and low-cobalt solution, high impurity content, etc., to improve extraction selectivity, facilitate industrial application, and simple process Effect

Active Publication Date: 2021-04-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Step (1): Treat lateritic nickel ore by pre-roasting transformation-phosphoric acid atmospheric pressure leaching, pre-roasting temperature 400°C, roasting time 1h, phosphoric acid concentration 3mol / L, leaching temperature 90°C, leaching time 2h, leaching liquid-solid ratio 10: 1. After the leaching is completed, a section of leaching solution is obtained. The leaching rate of nickel is 98.43%, the leaching rate of cobalt is 89.69%, and the leaching rate of iron is 7.08%. The pH of the obtained leachate was 0.7, and the contents of main metal ions in the leachate were shown in Table 2.

[0063] Table 2 Concentration of metal element ions in leachate

[0064]

[0065] Step (2): Using ammonia water as an alkaline agent, adjust the pH of the leach solution obtained in step (1) to 3.0 to obtain the first impurity removal solution. At this time, the removal rates of aluminum, iron and manganese in the leach solution are 57.7% respectively , 91.2%, and 60.0%, and the los...

Embodiment 2

[0071] Compared with Example 1, the only difference is that in step (4), the extraction stages of P507 are three stages, and the cobalt extraction rates after three stages of extraction are 96.6% and 8.7%, respectively.

Embodiment 3

[0073] Compared with Example 1, the only difference is that in step (4), the extraction rates of cobalt and nickel after primary extraction are 54.2% and 2.5%, respectively. After the primary extraction through P507, the extraction rate of cobalt is low.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B23/00C22B3/06C22B3/22C22B3/38C22B1/02
CPCC22B1/02C22B3/06C22B3/22C22B23/00C22B3/3844C22B3/3846Y02P10/20
Inventor 罗骏李光辉姜涛饶明军朱忠平彭志伟张鑫
Owner CENT SOUTH UNIV
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