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Method and device for selectively leaching scandium from laterite nickel ore smelting slag

A technology for laterite nickel ore and smelting slag, applied in the field of selective leaching of scandium, which can solve the problem of low leaching rate of rare earth elements

Pending Publication Date: 2019-05-21
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a method and device for selectively leaching scandium from laterite nickel ore smelting slag, so as to solve the low leaching rate of rare earth elements when the existing direct acid leaching method is used to leach laterite nickel ore The problem

Method used

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  • Method and device for selectively leaching scandium from laterite nickel ore smelting slag
  • Method and device for selectively leaching scandium from laterite nickel ore smelting slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] The laterite nickel ore smelting slag or the first ore phase restructuring agent (9mol / L H 2 SO 4 ) in a ratio of 1g:1mL to obtain the reconstituted mineral acid salt. Complete the first reconstruction of ore phases in laterite nickel ore smelting slag.

[0070] Use laterite nickel ore smelting slag and the second ore phase reconstruction agent (0.1mol Na 2 SO 4 solution) at a dosage ratio of 1g:1mL, mix the reconstituted mineral acid salt with the second mineral phase reconstituter, then raise it from room temperature to 450°C at 10°C / min, and keep the temperature constant for 2h to carry out the second Refactoring process. Then the low-temperature roasted product was raised from 450°C to 650°C, and roasted at 650°C for 4 hours to reconstruct the ore phase of the lateritic nickel ore smelting slag for the third time to obtain a medium-temperature roasted product. After the calcination is completed, it is cooled to below 300°C with the furnace.

[0071] Under stir...

Embodiment 2

[0073] The laterite nickel ore smelting slag is mixed with the first mineral phase restructuring agent in a ratio of 1g:0.8mL to obtain the reconstructed mineral salt. The first mineral phase restructuring agent is analytically pure H 2 SO 4 Mixed solution with analytical pure HCl solution, the weight ratio is 5:1.

[0074] Raise the reconstituted mineral acid salt from room temperature to 450°C at 10°C / min, and roast at 450°C for 2 hours to perform a second reconstruction of the laterite nickel ore smelting slag phase to obtain a low-temperature roasted product.

[0075] The low-temperature roasted product was raised from 450°C to 680°C, and roasted at 680°C for 1 hour to reconstruct the ore phase of lateritic nickel ore smelting slag for the third time to obtain a high-temperature roasted product. After the roasting was completed, the high-temperature roasted product was The furnace is cooled to below 300°C.

[0076] Under stirring, wash the high-temperature roasted produc...

Embodiment 3

[0078] The difference from Example 1 is that the temperature of the medium-temperature roasting process is 400°C.

[0079] The leaching rate of rare earth scandium element is 85wt%, the leaching rate of iron element is 1.90wt%, the leaching rate of chromium element is less than 1wt%, the leaching rate of silicon element is less than 0.5wt%, and the leaching rate of aluminum element is less than 50wt%.

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Abstract

The invention provides a method and device for selectively leaching scandium from laterite nickel ore smelting slag. The method comprises the steps of mixing the laterite nickel ore smelting slag andan aqueous solution of a first ore phase refactoring agent to obtain refactoring mineral acid, wherein the first ore phase refactoring agent includes acid; carrying out intermediate-temperature roasting on the refactoring mineral acid to obtain an intermediate-temperature roasted product, wherein the temperature of the intermediate-temperature roasting process ranges from 500 DEG C to 800 DEG C; and washing the intermediate-temperature roasted product to obtain leaching liquid with scandium. With the treatment method, the pyrogenic decomposition process of the scandium element can be restrained through the ore phase refactoring process, and then the purpose of selectively leaching the scandium element from the laterite nickel ore smelting slag can be achieved.

Description

technical field [0001] The invention relates to the field of recovery of rare earth elements, in particular to a method and device for selectively leaching scandium from laterite nickel ore smelting slag. Background technique [0002] There are very few invention patents related to the recovery of valuable elements in laterite nickel ore smelting slag. In the existing technical solutions, scandium is mainly extracted by direct mineral acid leaching, which is usually not strong enough for the selective leaching of target elements. All acid-soluble elements in the smelting slag of lateritic nickel ore can be more or less dissolved in the leach solution, among which silicon element will cause great difficulty in solid-liquid separation. In subsequent steps such as extraction, washing, stripping, and purification, impurity elements such as silicon, iron, titanium, and chromium will undoubtedly increase the difficulty of scandium extraction and separation. [0003] The acid con...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B3/06C22B1/02
CPCY02P10/20
Inventor 刘召波付国燕王玮玮杜尚超李诺孙宁磊
Owner CHINA ENFI ENGINEERING CORPORATION
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