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Recycling method of rare earth-containing aluminum silicon waste material

A recovery method, aluminum-silicon technology, applied in the direction of improvement of process efficiency, preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the problem of high recovery cost of rare earth, reduce the amount of alkali and reduce the cost of recovery Effect

Active Publication Date: 2015-09-23
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a recovery method of rare earth-containing aluminum silicon waste to solve the problem of high recovery cost of rare earth in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Use hydrochloric acid to treat rare earth-containing aluminum-silicon waste, hydrogen ions in hydrochloric acid [H + ] at a concentration of 1mol / L, leached with mechanical stirring (200rad / min) at room temperature (25°C) for 6h, controlled pH=4.5 in the solution during the reaction, and pH=4.2 in the solution at the end of the reaction; Silica-alumina slag. The leaching rates of rare earth and aluminum in the acid leaching solution (both calculated as oxides) were 45.6% and 12.7%, respectively.

Embodiment 2

[0035] Use hydrochloric acid to treat rare earth-containing aluminum-silicon waste, hydrogen ions in hydrochloric acid [H + ] at a concentration of 0.5mol / L, leached with mechanical stirring (200rad / min) at room temperature (25°C) for 6h, controlled pH=3.8 in the solution during the reaction, and pH=3.5 in the solution at the end of the reaction; filtered to obtain the pickling solution and Silicon-rich aluminum slag. The leaching rates of rare earth and aluminum in the acid leaching solution (both calculated as oxides) were 75.6% and 21.2%, respectively.

Embodiment 3

[0037] Use hydrochloric acid to treat rare earth-containing aluminum-silicon waste, hydrogen ions in hydrochloric acid [H + ] at a concentration of 1mol / L, leaching with mechanical stirring (200rad / min) at 45°C for 8h, controlling the pH in the solution during the reaction to 3.6, and the pH in the solution at the end of the reaction to 3.5; filter to obtain acid leaching solution and silicon-rich aluminum slag . The leaching rates of rare earth and aluminum in the acid leaching solution (both calculated as oxides) were 90.4% and 38.7%, respectively.

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Abstract

The invention discloses a recycling method of a rare earth-containing aluminum silicon waste material, wherein the recycling method comprises the following steps: S1, carrying out a reaction of the rare earth-containing aluminum silicon waste material with an inorganic strong acid aqueous solution, and after the reaction, filtering to obtain an acid leaching liquid and a silicon-enriched aluminum slag; S2, adding an inorganic alkali to the acid leaching liquid, and after the reaction, filtering to obtain a precipitated enriched product; and S3, carrying out a reaction of the precipitated enriched product with a sodium hydroxide aqueous solution, and after the reaction, filtering to obtain a sodium metaaluminate solution and a rare earth enriched product. After rare earth ions and aluminum ions firstly form the precipitated enriched product, because a large number of aqueous-phase solvent in the acid leaching liquid is removed by filtration and the sodium hydroxide aqueous solution is added into the precipitated enriched product, the concentration of the sodium hydroxide solution in the reaction process can be improved, production of sodium metaaluminate is promoted, the sodium hydroxide amount is reduced, and thus the recovery cost is reduced.

Description

technical field [0001] The invention relates to the field of rare earth recycling, in particular to a method for recycling rare earth-containing aluminum and silicon waste. Background technique [0002] Rare earth is a general term for 17 elements including lanthanides, scandium and yttrium. The application fields of rare earth elements are very wide, and can be used to prepare fluorescent materials, rare earth metal hydroxide battery materials, electric light source materials, permanent magnet materials and catalytic materials. With the increasing application of rare earth elements in various fields, the consumption of rare earth elements is also increasing. [0003] Rare earth is an indispensable strategic resource for the development of high-tech industries and the transformation of traditional industries. It is recovered from the waste residue generated in the production process of rare earth molecular sieves, waste petroleum cracking catalysts (waste FCC catalysts) and...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B59/00C01F7/04
CPCY02P10/20
Inventor 黄小卫徐旸王强龙志奇王良士王金玉冯宗玉崔大立王春梅
Owner GRIREM ADVANCED MATERIALS CO LTD