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Method for recycling and applying discarded rare earth polishing powder into crystal glass

A rare earth polishing powder, crystal glass technology, applied in polishing compositions containing abrasives, chemical instruments and methods, other chemical processes, etc., can solve the problems of inefficiency, consumption, secondary pollution, etc.

Inactive Publication Date: 2012-03-28
JINHUA GUANHUA CRYSTAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods are not suitable for the extraction and regeneration of rare earth polishing powder slag with low rare earth content, which will consume a large amount of chemical substances such as strong acid and strong alkali, bring huge treatment costs, are not economical, and will also produce a large amount of saline wastewater. bring secondary pollution

Method used

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  • Method for recycling and applying discarded rare earth polishing powder into crystal glass
  • Method for recycling and applying discarded rare earth polishing powder into crystal glass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] (1) Gravity separation on a shaking table to remove light components and purify rare earth polishing powder residue

[0061] Take 50Kg of rare earth polishing powder waste and sieve through a 1m long vibrating sieve to remove large particles and foreign matter. The sieve size is 0.5mm. Use the pulping machine to pulp the waste residue of each fraction into a slurry with a concentration of 20%. 2 Gravity separation is carried out on a shaker with the same specifications, and the heavy fraction is collected. After dry weighing measurement and test analysis, the rare earth recovery rate is 70.3%, and the rare earth purity is 80.1%.

[0062] (2) Dilute nitric acid dissolves non-glass impurities

[0063] Take 100g of dried rare earth polishing powder residue after re-selection on a shaker in a 250ml beaker, add 100g of water to make a slurry, stir evenly, heat up to 50°C, and then slowly add dilute nitric acid solution with a concentration of 1.0mol / L, Stop adding dilute ...

Embodiment 2

[0072]The gravity separation process is the same as in Example 1, except that the size of the vibrating sieve is 1 mm. After weighing measurement and test analysis: the rare earth recovery rate is 75.2%, the rare earth purity is 78.6%, and the gravity purification efficiency is slightly low. The amount of subsequent dilute nitric acid and hydrofluoric acid was increased to 30ml and 40ml respectively, the recovery rate of rare earth was 94.6%, the purity of rare earth reached 88%, and the abrasive amount of polishing powder was 52.6%.

Embodiment 3

[0074] The gravitational separation process was the same as in Example 1, except that the concentration of the separated slurry before the gravimetric separation was 25%. After weighing, measurement and test analysis: the rare earth recovery rate is 68.4%, and the rare earth purity is 83.2%. The amount of subsequent dilute nitric acid and hydrofluoric acid remains unchanged, the recovery rate of rare earth is 95.6%, the purity of rare earth reaches 91%, and the abrasive amount of polishing powder is 54.5%.

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Abstract

The invention discloses a method for recycling and applying discarded rare earth polishing powder into crystal glass, which includes the following process flow: (1) screening equipment is utilized to coarsely screen waste rare earth polishing powder residue in order to remove foreign matters and large particles; (2) the waste rare earth polishing powder residue is pulped, gravity concentration equipment is utilized to carry out gravity separation, and the separated heavy component is high-content rare earth polishing powder waste; (3) strong acid is then used for chemical treatment to dissolve soluble substances in the rare earth polishing powder waste; (4) the waste is roasted at high temperature being more than 800 DEG C in order to remove thermosetting resin and organic greasy dirt in the waste and increase the rigidity of the rare earth polishing powder; (5) after the temperature is decreased, the roasted material is levigated to reach such a grain size range that the roasted material can be reused as polishing powder. The separation method for extracting the rare earth component has the following advantages: the dosage of chemical substances is little, so that environment pollution is reduced; the method is easy to operate, and the treatment cost is low; the rare earth recovery rate is high, and the purity of the extracted rare earth is high.

Description

technical field [0001] The invention relates to a regeneration method of waste rare earth polishing powder in the crystal industry. Background technique [0002] The crystal industry is an industry that takes crystal glass as the initial raw material and processes it into various shapes of glass products with natural crystal characteristics through mechanical cutting, grinding, polishing and other means. In the crystal processing process, polishing is a very important link. Through polishing, the surface characteristics and optical properties of the product can be improved, making the crystal glass product more natural crystal performance. In the crystal glass industry, polishing is mainly done by rare earth polishing powder. [0003] However, the rare earth polishing powder is constantly consumed in the polishing process and becomes solid waste. Therefore, there is a large amount of waste slag rich in rare earth polishing powder in the crystal industry. In these waste re...

Claims

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Application Information

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IPC IPC(8): C09K3/14C09G1/02
Inventor 雷华张序虎张甜甜鲁阳
Owner JINHUA GUANHUA CRYSTAL
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