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Method for recovering rare earth, aluminum and silicon from rare earth-containing aluminum and silicon wastes

A rare earth and aluminum-silicon technology, applied in chemical instruments and methods, preparation/processing of rare earth metal compounds, rare earth metal nitrates, etc., can solve the problems of high recovery cost and low recovery efficiency, and achieve reduction of recovery cost and consumption. , the effect of reducing the amount of

Active Publication Date: 2017-01-11
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for recovering rare earth, aluminum and silicon from rare earth-containing aluminum-silicon waste to solve the technical problems of high recovery cost and low recovery efficiency in existing methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] After slurrying the rare earth-containing aluminum-silicon waste, the liquid-solid ratio is 3:1, add 1mol / L hydrochloric acid to treat the rare-earth-containing aluminum-silicon waste, control the pH value of the reaction process to 2.5, and mechanically stir at 10°C (200rad / min) After leaching for 12 hours, control the pH of the solution at the end of the reaction to 2.0; filter to obtain the acid leaching solution containing rare earth and aluminum and silicon-rich slag. The leaching rates of aluminum, rare earth and silicon (all as oxides) in the acid leaching solution containing rare earth and aluminum were 66.9%, 85.3% and 3.5%, respectively.

Embodiment 2

[0055] Before the acid leaching reaction, the rare earth-containing aluminum-silicon waste is crushed, ground, and slurried. After sizing, the liquid-solid ratio is 4:1. Add 3mol / L hydrochloric acid to treat rare earth-containing aluminum-silicon waste, control the pH value of the reaction process to 2.0, leaching with mechanical stirring (180rad / min) at 20°C for 8h, and control the pH of the solution at the end of the reaction=1.8; filter to obtain rare earth and aluminum-containing pickling solution and silicon-rich slag. The leaching rates of aluminum, rare earth and silicon in the acid leaching solution containing rare earth and aluminum (all calculated as oxides) were 73.6%, 89.2% and 4.2%, respectively.

Embodiment 3

[0057] The liquid-solid ratio is 5:1 after slurrying the rare earth-containing aluminum-silicon waste. Add 5mol / L hydrochloric acid to treat the aluminum-silicon waste containing rare earth, control the pH value of the reaction process to 1.8, leaching with mechanical stirring (220rad / min) at 40°C for 6h, and control the pH of the solution at the end of the reaction=1.5; filter to obtain the rare earth and aluminum-containing pickling solution and silicon-rich slag. The leaching rates of aluminum, rare earth and silicon (calculated as oxides) in the acid leaching solution containing rare earth and aluminum were 77.2%, 91.5% and 4.5%, respectively.

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PUM

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Abstract

The invention provides a method for recovering rare earth, aluminum and silicon from rare earth-containing aluminum and silicon wastes. The method comprises the following steps: 1, carrying out acid dipping on the rare earth-containing aluminum and silicon wastes by using an aqueous inorganic acid solution to obtain silicon-rich residues and an acid dipping solution containing rare earth ions and aluminum ions; 2, adding an alkaline substance to the acid dipping solution containing rare earth ions and aluminum ions to control the pH value of the acid dipping solution to be 3.5-5.2, and carrying out solid-liquid separation to obtain an aluminum hydroxide-containing precipitate and a rare earth-containing filtrate; and 3, reacting the aluminum hydroxide-containing precipitate with sodium hydroxide to obtain a sodium metaaluminate solution and aluminum and silicon residues, and using the rare earth-containing filtrate to prepare a rare earth compound product. Aluminum and rare earth are dissolved in the acid, segmented alkaline transfer is carried out, the aluminum ions are precipitated to obtain aluminum hydroxide and the rare earth ions which are separated from the aluminum hydroxide, and excess sodium hydroxide is added to convert aluminum hydroxide into the sodium metaaluminate solution, so simultaneous and high-efficiency recycling of the rare earth and aluminum is realized, the use amount of sodium hydroxide is greatly reduced, and the recovery cost is reduced.

Description

technical field [0001] The invention relates to the field of rare earth recovery, in particular to a method for recovering rare earth, aluminum and silicon from 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 cracki...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B59/00C22B21/00C01F7/04C01F7/0693C01F17/10C01F17/206
CPCC01F7/04C22B7/00C22B3/44C01F7/0693C01F7/22C01F7/24C01F7/26C22B7/007C22B21/0023C22B59/00C01F17/276C01F17/271C01F17/10C01F17/206Y02P10/20
Inventor 黄小卫王强徐旸王金玉王良士冯宗玉崔大立龙志奇赵娜
Owner GRIREM ADVANCED MATERIALS CO LTD
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