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Method and device for selective leaching of valuable elements from slag

A valuable element and selective technology, applied in the direction of improving process efficiency, can solve the problem of low leaching rate of valuable elements

Pending Publication Date: 2019-05-17
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 valuable elements from slag, so as to solve the problem that the leaching rate of valuable elements is low when the slag is leached by the existing direct acid leaching method

Method used

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  • Method and device for selective leaching of valuable elements from slag
  • Method and device for selective leaching of valuable elements from slag
  • Method and device for selective leaching of valuable elements from slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] use as figure 1 The process shown in the process recovers scandium, and mixes the dry laterite ore with the first mineral phase reconstruction agent (sulfuric acid) and water in a ratio of 1g:0.6g:0.5mL to obtain a reconstructed mineral salt.

[0071] With reconstituted mineral acid salt and the second ore phase reconstituted agent (0.1mol / L Na 2 SO 4 solution) at a ratio of 1g:1mL, mix the reconstituted mineral acid salt with the second mineral phase reconstituter, then raise it from room temperature to 500°C at 10°C / min, and keep the temperature constant for 0.5h to carry out the second refactoring process. Then the low-temperature calcined product was raised from 550°C to 730°C, and calcined at 730°C for 2 hours to perform the third reconstruction to obtain a medium-temperature calcined product. After the calcination is completed, it is cooled to below 300°C with the furnace to obtain a medium-temperature calcination product.

[0072] According to the solid-to-li...

Embodiment 2

[0074] use as figure 2 The shown technological process recovers scandium element, mixes laterite ore with the second ore phase reconstruction agent in a ratio of 1g:0.4mL to obtain an intermediate product, wherein the second ore phase reconstruction agent is Na 2 SO 4 and KCl in a weight ratio of 1:1, and the concentration is 2mol / L. Add the first mineral phase reconstruction agent to the above intermediate product, and add 0.5mL of the first mineral phase reconstruction agent per gram of laterite to obtain the mineral phase reconstruction product, wherein the first mineral phase reconstruction agent is 18mol / L of sulfuric acid.

[0075] At a heating rate of 5°C / min, it was aged from room temperature to 150°C for 30 minutes, then continued to heat up to 500°C, and fired at 500°C for 1 hour to obtain a low-temperature calcined product. The heating process is mainly to reconstruct the ore phase of laterite ore for the second time.

[0076] The low-temperature roasted produc...

Embodiment 3

[0079] The difference from Example 1 is that the temperature of the medium-temperature roasting process is 400°C.

[0080] The leaching rate of rare earth scandium element is 84wt%, the leaching rate of iron element is 2.20wt%, 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 35wt%.

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Abstract

The invention provides a method and a device for selective leaching of valuable elements from slag. The method comprises the following steps: mixing the slag with the aqueous solution of a first ore phase reconstruction agent to obtain reconstructed mineral acid salt; carrying out low-temperature roasting on the reconstructed mineral acid salt and a second ore phase reconstruction agent to obtaina low-temperature roasting product; carrying out medium-temperature roasting on the low-temperature roasting product to obtain a medium-temperature roasting product; and washing the medium-temperatureroasting product to obtain leaching solution containing valuable elements. Under the action of the first ore phase reconstruction agent, first-time reconstruction of the slag is realized; under the action of the second ore phase reconstruction agent, low-temperature roasting is carried out to realize second-time reconstruction of the reconstructed mineral acid salt; through the medium-temperatureroasting process, the third-time reconstruction of the low-temperature roasting product is realized; and the leaching solution containing valuable elements is obtained through washing. Through three-time ore phase reconstruction process, the pyrolysis process of the valuable elements can be restrained during the roasting process to realize the purpose of selective leaching of valuable elements.

Description

technical field [0001] The invention relates to the field of recovery of valuable elements in hydrometallurgy, in particular to a method and device for selectively leaching valuable elements from slag. Background technique [0002] There are few invention patents related to the recovery of valuable elements in slag. The existing methods mainly use the direct acid leaching method to extract valuable elements, which is usually not strong enough for the selective leaching of target elements. The acid-soluble elements in the slag can be more or less soluble in the leaching solution, among which, the 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 extracting and separating valuable elements. [0003] The acid consumption of the direct mineral acid leaching method is relati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B1/02C22B59/00C22B23/00C22B61/00
CPCY02P10/20
Inventor 刘召波王玮玮李诺杜尚超付国燕孙宁磊
Owner CHINA ENFI ENGINEERING CORPORATION
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