Method for selectively extracting scandium from laterite-nickel ore by adopting sulfuric acid roasting-water leaching method

A technology of laterite nickel ore and sulfuric acid roasting, applied in the field of metallurgical engineering, to achieve the effects of easy control, clean and efficient extraction, scandium recovery rate and high product quality

Pending Publication Date: 2022-05-13
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Sulfation roasting-water leaching, as a traditional smelting process, has been confirmed by researchers to selectively extract nickel and cobalt from laterite nickel ore, but there is no relevant report on the use of this process to extract scandium from laterite nickel ore

Method used

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  • Method for selectively extracting scandium from laterite-nickel ore by adopting sulfuric acid roasting-water leaching method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The composition of laterite nickel ore treated in the present embodiment is: Ni 0.75wt.%, Co 0.061wt.%, Mn0.57wt.%, Sc0.0055wt.%, Fe 47.8wt.%, Mg 0.43wt.%, Al 3.98wt.%, Cr 1.23wt.%.

[0035] The present embodiment adopts sulfuric acid roasting - water immersion method to selectively extract scandium from laterite nickel ore, the process flow such as Figure 1 shown, including the following steps:

[0036] (1) Grinding: the laterite nickel ore is crushed and finely ground to obtain laterite nickel ore with a particle size of -0.074mm;

[0037] (2) Sulfation roasting: the laterite nickel ore obtained in step (1) is fully mixed with concentrated sulfuric acid, wherein the ratio of concentrated sulfuric acid to laterite nickel ore is 0.5mL / g, and then the mixture is placed in a tubular atmosphere furnace at 600 °C for roasting, roasting for 2.0h, to obtain the roasting product;

[0038](3) Water immersion: the calcination product obtained in step (2) is placed in water for lea...

Embodiment 2

[0044] The composition of laterite nickel ore treated in the present embodiment is: Ni 0.75wt.%, Co 0.061wt.%, Mn0.57wt.%, Sc0.0055wt.%, Fe 47.8wt.%, Mg 0.43wt.%, Al 3.98wt.%, Cr 1.23wt.%.

[0045] The present embodiment adopts sulfuric acid roasting - water immersion method to selectively extract scandium from laterite nickel ore, the process flow such as Figure 1 shown, including the following steps:

[0046] (1) Grinding: the laterite nickel ore is crushed and finely ground to obtain laterite nickel ore with a particle size of -0.074mm;

[0047](2) Sulfation roasting: the laterite nickel ore obtained in step (1) is fully mixed with concentrated sulfuric acid, wherein the ratio of concentrated sulfuric acid to laterite nickel ore is 0.3mL / g, and then the mixture is placed in a tubular atmosphere furnace for roasting, the roasting temperature is 800 °C, the roasting time is 2.0h, and the roasting product is obtained;

[0048] (3) Water leaching: the calcined product obtained in...

Embodiment 3

[0054] The composition of laterite nickel ore treated in the present embodiment is: Ni 0.75wt.%, Co 0.061wt.%, Mn0.57wt.%, Sc0.0055wt.%, Fe 47.8wt.%, Mg 0.43wt.%, Al 3.98wt.%, Cr 1.23wt.%.

[0055] The present embodiment adopts sulfuric acid roasting - water immersion method to selectively extract scandium from laterite nickel ore, the process flow such as Figure 1 shown, including the following steps:

[0056] (1) Grinding: the laterite nickel ore is crushed and finely ground to obtain laterite nickel ore with a particle size of -0.074mm;

[0057] (2) Sulfation roasting: the laterite nickel ore obtained in step (1) is fully mixed with concentrated sulfuric acid, and the ratio of concentrated sulfuric acid to laterite nickel ore is 1.0mL / g, and then the mixture is placed in a tubular atmosphere furnace for roasting, the roasting temperature is 500 °C, the roasting time is 3.0h, and the roasting product is obtained;

[0058] (3) Water leaching: the calcination product obtained in st...

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Abstract

The invention discloses a method for selectively extracting scandium from laterite-nickel ore by adopting a sulfuric acid roasting-water leaching method, which comprises the following steps: (1) crushing and finely grinding the laterite-nickel ore, and then mixing and roasting with concentrated sulfuric acid; (2) the roasted product obtained in the step (1) is subjected to water leaching, and leaching liquid and leaching residues are obtained; (3) extracting the leachate to obtain a scandium-containing organic phase and raffinate; (4) the scandium-containing organic phase is subjected to reverse extraction, and a scandium-rich solution and an organic phase are obtained; and (5) adding an oxalic acid solution into the scandium-rich solution for precipitation to obtain scandium oxalate. According to the method, the laterite-nickel ore is treated through a sulfating roasting-water leaching method, scandium can be selectively leached out, the problem that follow-up iron removal is difficult is effectively avoided, Cyanex572 is selected as the extracting agent, the extracting agent is good in scandium selective extraction effect and extraction and enrichment effect, the impurity content in the obtained scandium-rich solution is extremely low, and the method is suitable for industrial production. And the scandium oxide product obtained by subsequent oxalic acid scandium precipitation and calcination is relatively high in quality.

Description

Technical field [0001] The present invention belongs to the field of metallurgical engineering, in particular to a method of selectively extracting scandium from laterite nickel ore by sulfuric acid roasting - water immersion method. Background [0002] Scandium is a rare and expensive strategic metal, with high activity, high melting point, light weight, soft and other characteristics, widely used in national defense, military and other high-tech fields, the demand is increasing. It is a typical rare dispersed lithophilic element whose independent minerals are very rare in nature but widely distributed among other minerals. The content of scandium in laterite nickel ore ranges from 50g / t to 600g / t, which is considered to be the most promising scandium resource in the future. Laterite nickel ore can be simply divided into humus type and limonite type, the former can be effectively treated by pyrometallurgical process, but can not recover the high value scandium. Limonite-type la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B1/06C22B3/04C22B3/38
CPCC22B59/00C22B1/06C22B3/04
Inventor 田庆华董波郭学益许志鹏王青骜
Owner CENT SOUTH UNIV
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