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Method for selectively extracting scandium from laterite-nickel ore

A lateritic nickel ore and selective technology, applied in the field of metallurgical engineering, can solve the problems of high impurities, and achieve the effects of simple operating conditions, clean and efficient extraction, high-value preparation, and easy control

Pending Publication Date: 2022-05-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As the grade of laterite nickel ore decreases year by year, the atmospheric acid leaching process will definitely become the trend of future development, but it is urgent to solve the problem of selective extraction of trace scandium in high-impurity and high-acid systems

Method used

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  • Method for selectively extracting scandium from laterite-nickel ore
  • Method for selectively extracting scandium from laterite-nickel ore

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The composition of laterite nickel ore to be treated in this embodiment is: Ni 0.75wt.%, Co 0.061wt.%, Mn0.57wt.%, Sc 0.0055wt.%, Fe 47.8wt.%, Mg 0.43wt.%, Al 3.98wt.% and Cr1.23wt.%.

[0033] The method for selectively extracting scandium from laterite nickel ore of the present embodiment, the technological process is as follows figure 1 shown, including the following steps:

[0034] (1) Crushing and grinding the laterite nickel ore to obtain a laterite nickel ore with a particle size of -0.074mm;

[0035] (2) Put the finely ground laterite nickel ore in step (1) in 3.0mol / L sulfuric acid solution for atmospheric pressure acid leaching, the leaching time is 3.0h, the leaching temperature is 80°C, the leaching liquid-solid ratio is 5, and the ratio range mL / g, filter after leaching to obtain leaching solution and leaching residue. During this process, the leaching rates of Ni, Co, Mn, Sc, Fe, Mg, Al and Cr were 76.76%, 71.7%, 86.87%, 84.27% , 72.14%, 67.19%, 71.72% a...

Embodiment 2

[0041] The composition of laterite nickel ore to be treated in this embodiment is: Ni 0.75wt.%, Co 0.061wt.%, Mn0.57wt.%, Sc 0.0055wt.%, Fe 47.8wt.%, Mg 0.43wt.%, Al 3.98wt.% and Cr1.23wt.%.

[0042] The method for selectively extracting scandium from laterite nickel ore of the present embodiment, the technological process is as follows figure 1 shown, including the following steps:

[0043] (1) Crushing and grinding the laterite nickel ore to obtain a laterite nickel ore with a particle size of -0.074mm;

[0044] (2) Place the laterite nickel ore obtained in step (1) in 2.0mol / L sulfuric acid solution for atmospheric pressure acid leaching, the leaching time is 5.0h, the leaching temperature is 90°C, the leaching liquid-solid ratio is 7, and the ratio unit is mL / g, to obtain leachate and leach residue after filtration, the leaching rates of Ni, Co, Mn, Sc, Fe, Mg, Al and Cr in this process were 68.34%, 62.45%, 78.64%, 80.62%, 60.74%, 55.93% respectively %, 64.49% and 34.7...

Embodiment 3

[0050] The lateritic nickel ore to be treated in the present embodiment consists of: Ni 0.75wt.%, Co 0.061wt.%, Mn0.57wt.%, Sc0.0055wt.%, Fe 47.8wt.%, Mg 0.43wt.%, Al 3.98wt.%, Cr 1.23wt.%.

[0051] The method for selectively extracting scandium from laterite nickel ore of the present embodiment, the technological process is as follows figure 1 shown, including the following steps:

[0052] (1) Crushing and grinding the laterite nickel ore to be processed to obtain laterite nickel ore with a particle size of -0.074mm.

[0053] (2) Place the laterite nickel ore obtained in step (1) in 3.0mol / L sulfuric acid solution for atmospheric pressure acid leaching, the leaching time is 2.0h, the leaching temperature is 80°C, the leaching liquid-solid ratio is 3, and the ratio unit is mL / g, filtered after the leaching is completed, to obtain the leaching solution and leaching residue, the leaching rates of Ni, Co, Mn, Sc, Fe, Mg, Al and Cr in this process were 70.43%, 70.08%, 81.17%, 8...

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Abstract

The invention discloses a method for selectively extracting scandium from laterite-nickel ore. The method comprises the following steps: (1) carrying out normal-pressure acid leaching on the laterite-nickel ore with the particle size of-0.074 mm to obtain a leaching solution and leaching residues; (2) extracting the leachate obtained in the step (1) by adopting a composite extracting agent consisting of P204 and N1923 to obtain a scandium-containing organic phase and raffinate; (3) the scandium-containing organic phase obtained in the step (2) is subjected to reverse extraction, and a scandium-rich solution and an organic phase are obtained; and (4) adding an oxalic acid solution into the scandium-rich solution obtained in the step (3) for reaction to obtain scandium oxalate. According to the method, P204 and N1923 are adopted as extracting agents and cooperate with each other to extract scandium in the laterite-nickel ore normal-pressure leachate, selective extraction and separation of scandium in high-acid, high-iron and low-scandium normal-pressure leachate can be achieved, and the technical effect which cannot be achieved by adopting a conventional extracting agent in the prior art is achieved.

Description

technical field [0001] The invention belongs to the field of metallurgical engineering, in particular to a method for selectively extracting scandium from laterite nickel ore. Background technique [0002] Scandium (Sc) is a kind of rare earth element, highly dispersed in the crust, and its average crustal abundance is 22g / t. Scandium has the characteristics of high activity, light weight, softness, and high melting point. It is widely used in the fields of national defense and military industry, metallurgy and chemical industry, lightweight high-temperature resistant alloys, and new energy materials. At present, scandium is mainly used in aluminum-scandium alloys and zirconium-based solid oxide fuel cells. The global consumption of scandium is about 15 tons per year. Ores with a scandium content of 0.002-0.005% can be used as scandium extraction resources and are worth developing and utilizing. Black rare gold ore, scandium yttrium stone and silicon beryllium yttrium ore...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B3/40C22B3/22C22B3/08C01F17/212
CPCC22B59/00C22B3/22C22B3/08C01F17/212C01P2006/80Y02P10/20
Inventor 田庆华董波郭学益许志鹏王青骜
Owner CENT SOUTH UNIV
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