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Method for separating and extracting rare earth and regenerated rare earth polishing powder from waste rare earth polishing powder

A kind of rare earth polishing powder, rare earth technology, applied in the preparation/treatment of rare earth metal compounds, chemical instruments and methods, rare earth metal compounds, etc., can solve the problem of rare earth polishing powder consumption of rare earth, and achieve good polishing performance

Active Publication Date: 2021-04-30
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production of rare earth polishing powder needs to consume a large amount of rare earth La and Ce

Method used

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  • Method for separating and extracting rare earth and regenerated rare earth polishing powder from waste rare earth polishing powder

Examples

Experimental program
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Effect test

example 1

[0023] Proceed as follows:

[0024] (1) Ball milling pretreatment: ball mill waste rare earth polishing powder with a total mass fraction of rare earth oxides of 30% to 200 mesh to obtain ball milling waste;

[0025] (2) One-time acid leaching: put the ball mill waste obtained in step (1) into a container, add hydrochloric acid solution, carry out one acid leaching reaction under heating and stirring, carry out solid-liquid separation after one acid leaching reaction, filter to obtain leaching Slag and filtrate 1; the molar concentration of the hydrochloric acid solution is 6mol / L, the solid-to-liquid ratio of the ball mill waste and the hydrochloric acid solution is 1:7 kg / liter, the leaching temperature is 80°C, the leaching time is 3 hours, and the stirring speed is 500 rpm minute;

[0026] (3) Alkali roasting: mix the leached slag obtained in step (2) with NaOH and roast to obtain a roasted material; the mass ratio of leached slag to alkali is 1:4, the roasting temperatur...

example 2

[0035] Proceed as follows:

[0036] (1) Ball milling pretreatment: ball mill waste rare earth polishing powder with a total mass fraction of rare earth oxides of 40% to 400 mesh to obtain ball milling waste;

[0037] (2) One-time acid leaching: put the ball mill waste obtained in step (1) into a container, add hydrochloric acid solution, carry out one acid leaching reaction under heating and stirring, carry out solid-liquid separation after one acid leaching reaction, filter to obtain leaching Slag and filtrate 1; the molar concentration of the hydrochloric acid solution is 5mol / L, the solid-to-liquid ratio of the ball mill waste and the hydrochloric acid solution is 1:8 kg / liter, the leaching temperature is 70°C, the leaching time is 3 hours, and the stirring speed is 600 rpm minute;

[0038] (3) Alkali roasting: mix the leached slag obtained in step (2) with KOH and roast to obtain a roasted material; the mass ratio of leached slag to alkali is 1:1, the roasting temperature...

example 3

[0047] Proceed as follows:

[0048] (1) Ball milling pretreatment: ball mill waste cerium-based rare earth polishing powder with a total mass fraction of rare earth oxides of 50% to 400 mesh to obtain ball milling waste;

[0049] (2) One-time acid leaching: put the ball mill waste obtained in step (1) into a container, add hydrochloric acid solution, carry out one acid leaching reaction under heating and stirring, carry out solid-liquid separation after one acid leaching reaction, filter to obtain leaching Slag and filtrate 1; the molar concentration of the hydrochloric acid solution is 8mol / L, the solid-to-liquid ratio of the ball mill waste and the hydrochloric acid solution is 1:4 kg / liter, the leaching temperature is 75°C, the leaching time is 1 hour, and the stirring rate is 600 rpm / minute;

[0050] (3) Alkali roasting: mix the leached slag obtained in step (2) with NaOH and roast to obtain a roasted material; the mass ratio of leached slag to alkali is 1:3, the roastin...

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Abstract

The invention relates to a method for separating and extracting rare earth and regenerated rare earth polishing powder from waste rare earth polishing powder. The method is characterized by comprising the following steps that a primary acid leaching, alkali fusion and secondary acid leaching combined treatment process is firstly used for separating and extracting the rare earth in the waste rare earth polishing powder to obtain rare earth chloride leachate; then ammonia water is used for precipitation and impurity removing, and hydrochloric acid is used for acidolysis to obtain a purified rare earth chloride solution; then, hydrofluoric acid, an ammonium bicarbonate solution and a dispersing agent are used for coprecipitation to obtain a rare earth chloride solution so as to obtain cerium lanthanum fluorocarbonate powder; and finally, the regenerated rare earth polishing powder with good polishing performance is obtained through drying, two-stage high-temperature calcination and ball milling. According to the method, the total leaching rate of the rare earth in the waste rare earth polishing powder reaches 95% or above, the total recycle rate of the rare earth reaches 93% or above, and efficient separation, extraction and recycling of the rare earth in the waste rare earth polishing powder are achieved.

Description

technical field [0001] The invention relates to a recycling method of waste rare earth polishing powder, in particular to a method for separating and extracting rare earth and regenerated rare earth polishing powder from waste rare earth polishing powder. Background technique [0002] In recent years, with the rapid development of electronic and electrical equipment such as touch screens and liquid crystal displays, the requirements for the surface quality and polishing accuracy of glass substrates have become more and more stringent. with Fe 2 o 3 、Al 2 o 3 Compared with traditional surface grinding materials, rare earth polishing powder has the advantages of fine particle size, good chemical activity, strong grinding ability and long service life. Polishing of products such as wave tubes and plexiglass. The extensive application of rare earth polishing powder has led to an increase in the production of waste rare earth polishing powder in my country year by year. Rele...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/00C22B59/00C09G1/02C01F17/10C01F17/30
CPCC22B7/007C22B7/006C22B1/005C22B59/00C09G1/02C01F17/10C01F17/30Y02P10/20C01F17/241C22B3/44C22B1/02C09K3/1454B24B57/04C09K3/1418
Inventor 吴玉锋宋岷洧章启军
Owner BEIJING UNIV OF TECH
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