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Method for recycling and reutilizing rare-earth polishing powder waste residue and waste liquor

A rare earth polishing powder and rare earth polishing technology, which is applied in grinding/polishing equipment, machine tools suitable for grinding workpiece planes, grinding machines, etc., can solve the pollution of the environment after fluoride post-processing, has not been popularized and applied, and wastes valuable rare earth resources and other issues, to achieve the effect of high recycling rate, low recycling cost and high recycling rate

Active Publication Date: 2013-03-27
LENS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The treatment of the above rare earth polishing powder is to use fluoride to dissolve glass components to remove impurities. Not only is the process complicated, but it will also bring about the problems of post-treatment of fluoride and environmental pollution, so it has not been widely used so far.
Most enterprises still treat rare earth polishing powder waste slag and waste liquid as ordinary waste slag and wastewater, which not only causes waste of precious rare earth resources, but also causes certain environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 1000 grams of rare earth polishing powder waste residue, put it in a high-speed disperser, add 1000 grams of water, and disperse at a high speed for 1 hour at a speed of 3000 revolutions per minute. Take out and pass through 20 mesh, 150 mesh and 320 mesh vibrating sieves respectively. The rare earth polishing powder waste liquid obtained after sieving is poured into a centrifuge, and centrifuged at a speed of 1000 revolutions per minute. After removing the suspension in the upper layer, the sediment was taken out and subjected to pressure filtration under a pressure of 1 MPa to obtain recovered rare earth polishing powder mud. Put the mud into a high-speed disperser, add water with the same weight as the mud, disperse at a high speed of 1500 rpm for 30 minutes, pass through a 400-mesh vibrating sieve, and then add water to adjust the weight percentage of the rare earth oxide to 15 %, that is, the rare earth polishing agent that can be used for precision polishing...

Embodiment 2

[0024] Take 3000 milliliters of rare earth polishing powder waste liquid, pass through 60 mesh and 300 mesh vibrating sieves respectively, pour the rare earth polishing powder waste liquid obtained after sieving into a centrifuge, and carry out centrifugation at a speed of 1500 rpm. After removing the suspension in the upper layer, the sediment was taken out and subjected to pressure filtration under a pressure of 1.2 MPa to obtain recovered rare earth polishing powder mud. Put the mud block into a high-speed disperser, add water with the same weight as the mud block, and disperse at a high speed of 2000 rpm for 15 minutes, pass through a 300-mesh vibrating sieve, and then add water to adjust the weight percentage of the rare earth oxide to 20%, that is, the rare earth polishing agent that can be used for precision polishing of glass is prepared.

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Abstract

The invention relates to the technical field of material preparation, particularly provides a method for recycling and reutilizing rare-earth polishing powder waste residue and waste liquor, which is realized in a way that: removing various impurities by carrying out high-speed dispersion, screening, centrifugal settling, pressure filtration, high-speed dispersion and other physical methods on the recycled rare-earth polishing powder waste residue and waste liquor, thereby finally obtaining the rare-earth polishing compound which can be directly used for glass precision polishing, and implementing the reutilization of the rare-earth polishing powder waste residue and waste liquor. By using the method, the recycling rate of rare-earth oxides in the rare-earth polishing powder waste residue and waste liquor is 80-85%, hydrogen fluoride and other fluorides are not need, and high-temperature roasting treatment is also not needed; and thus, the invention has the characteristics of energy saving, environmental protection, less investment, low recycling cost, simple technical process, high reutilization rate and the like.

Description

technical field [0001] The invention relates to material preparation technology, and further refers to a method for recovering and reusing rare earth polishing powder waste slag and waste liquid. Background technique [0002] With its unique physical and chemical properties and excellent polishing performance, rare earth polishing powder is widely used in the precision polishing of electronic glass, optical glass, jewelry and precision instruments and other glass devices. With the increase in the amount of rare earth polishing powder and the country's protective mining of rare earth mineral resources, on the one hand, the supply of rare earth polishing powder is becoming increasingly tight; on the other hand, the waste slag and waste liquid of rare earth polishing powder formed during use are also increasing. [0003] The rare earth polishing powder waste residue is mainly the massive waste that is gradually condensed on various parts of the polishing equipment and the overs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09G1/04B24B7/24
Inventor 肖汉宁张海峰叶昌
Owner LENS TECH