Preparation method for regenerating rear-earth polishing powder

A technology of rare earth polishing powder and mass percentage, which is applied in the direction of chemical instruments and methods, polishing compositions containing abrasives, and other chemical processes, and can solve the problems of low solubility of rare earth oxides, reduction of rare earth oxide content, low recovery rate, etc. problems, to achieve the effect of reducing the difficulty of chemical treatment, narrow particle size distribution range, and easy industrial production

Inactive Publication Date: 2014-07-02
UNIV OF JINAN
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  • Application Information

AI Technical Summary

Problems solved by technology

The main reasons for the failure of rare earth polishing powder are: first, a large number of glass particles will be enriched on the surface of rare earth oxides during the polishing process, as well as oil stains and large particles of foreign matter, which reduce the content of rare earth oxides and make During the polishing process, the polishing powder reduces the frictional heat, reduces the plasticity of the glass surface, and affects the process of redistribution of molecules on the glass surface and the formation of a flat surface.
The second is that the polishing process is a strong grinding process, which leads to excessive refinement of the polished grains and reduces the polishing effect
Chinese patent CN1246407C discloses a regeneration method for failed rare earth polishing powder. This method proposes a regeneration technology for the failed rare earth polishing powder. The method proposes to use 0.5~3mol / L water-soluble Alkali and water-soluble fluoride chemical reagents are used for chemical treatment, so a large amount of chemical reagents are consumed, which is uneconomical, and a large amount of waste water is generated, which will bring environmental pollution, and does not involve the output of other components, and then recover solid heat treatment, applicable limited range
Disclosed in the Chinese patent CN1194060C is a regeneration method of regenerated rare earth polishing powder. The method is to add waste rare earth polishing powder to acid to dissolve the trivalent rare earth oxide, CeO 2 Add 30% hydrogen peroxide to the undissolved CeO 2 Dissolve, then add 5~8% light rare earth hydroxide or Ce(OH) 4 The suspension is rare earth re-precipitation. This method of dissolving rare earth and redox realizes the regeneration of rare earth polishing powder. Therefore, it consumes a large amount of chemical reagents, which is uneconomical, and produces a large amount of waste water, which will bring environmental pollution. Moreover, rare earth oxides The solubility is very low and the recovery rate is very low
These methods will consume a large amount of chemical substances such as strong acid and strong alkali, which will bring huge costs, are uneconomical, and will also generate a large amount of waste water, causing pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Gravity selection of rare earth polishing powder: take 30kg of discarded rare earth polishing powder, and use a 60-mesh sieve to remove large particles and foreign matter. Sizing the fine components after sieving, the mass percentage concentration of the slurry is 25% slurry, using 1m 2 Gravity separation was carried out on a shaking table, and heavy fractions were collected. After drying, the re-election rare earth polishing powder can be obtained. Through weighing measurement and analysis test, the results show that the recovery rate of rare earth is 72.6%, and the purity of rare earth is 79.2%.

[0021] (2) Preparation of primary rare earth polishing powder: Take 500g of dried and gravity-selected rare earth polishing powder in a 1000mL beaker, add 500mL of 10% by mass ammonium hexafluorozirconate aqueous solution, stir evenly, heat up to 50°C, Stirring and reacting for 8 h, and then reclaiming the solid after settling, washing and filtering, to obtain primary r...

Embodiment 2

[0024] (1) Gravity selection of rare earth polishing powder: take 30kg of discarded rare earth polishing powder, and use a 60-mesh sieve to remove large particles and foreign matter. Sizing the fine components after sieving, the mass percentage concentration of the slurry is 35% slurry, using 1m 2 Gravity separation was carried out on a shaking table, and heavy fractions were collected. After drying, the re-election rare earth polishing powder can be obtained. Through weighing measurement and analysis test, the results show that the recovery rate of rare earth is 73.6%, and the purity of rare earth is 80.2%.

[0025] (2) Preparation of primary rare earth polishing powder: Take 300g of dried and gravity-selected rare earth polishing powder in a 1000mL beaker, add 500mL of 8% by mass ammonium hexafluorozirconate aqueous solution, stir evenly, heat up to 60°C, Stirring and reacting for 10 h, then reclaiming the solid after settling, washing and filtering, to obtain primary rare ...

Embodiment 3

[0028] (1) Gravity selection of rare earth polishing powder: take 30kg of discarded rare earth polishing powder, and use a 60-mesh sieve to remove large particles and foreign matter. Sizing the fine components after sieving, the mass percentage concentration of the slurry is 30% slurry, using 1m 2 Gravity separation was carried out on a shaking table, and heavy fractions were collected. After drying, the re-election rare earth polishing powder can be obtained. Through weighing measurement and analysis test, the results show that the recovery rate of rare earth is 71.8%, and the purity of rare earth is 81.2%.

[0029] (2) Preparation of primary rare earth polishing powder: Take 500g of dried and gravity-selected rare earth polishing powder in a 1000mL beaker, add 600mL of 5% ammonium hexafluorozirconate aqueous solution, stir evenly, heat up to 70°C, Stirring and reacting for 12 h, then reclaiming the solid after settling, washing and filtering, to obtain primary rare earth po...

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Abstract

The invention discloses a preparation method for regenerating rear-earth polishing powder. The preparation method comprises the following processes: (1) mixing the waste rear-earth polishing powder and adopting a shaker reselecting device for reselecting and separating to obtain heavy constituents; (2) treating the reselected rear-earth polishing powder by 2%-25% (in percentage by weight) of ammonium fluozirconate aqueous solution; heating up to 50 DEG C to 75 DEG C; stirring and reacting for 6-12 hours; and settling, cleaning and filtering to recycle solid; and (3) preparing regenerated rear-earth polishing powder, wherein the primarily generated rear-earth polishing powder is primarily dried, roasted for 3-10 hours at 1000 DEG C to 1100 DEG C, cooled, crushed by gas flow to obtain the regenerated rear-earth polishing powder which can reach a grain size range for being reused as the polishing powder. The preparation method for regenerating rear-earth polishing powder has the advantages of being less in using amount of chemical substances, simple in process, easy to control conditions, low in production cost, easy to realize industrial production, high in recovery rate, good in powder polishing effect and the like.

Description

technical field [0001] The invention relates to a treatment method for reusing waste resources, in particular to a preparation method for regenerating spent rare earth polishing powder. Background technique [0002] Rare earth polishing powder is used for polishing lenses, flat glass, TV glass shells, spectacle lenses, decorative glass products, watch cases, precision optical instrument components, etc. It has the characteristics of fast polishing speed and high precision. It is processed by mechanical cutting, grinding, polishing and other means. Polishing is a very important link in the processing process. Polishing can improve the surface characteristics and optical properties of various products. At present, polishing mainly relies on rare earth polishing powder To be done. The total production of rare earth polishing powder in the world is about 20,000 tons. The production and application of rare earth polishing powder in my country are roughly equal. The annual produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/14C09G1/02
Inventor 李慧芝许崇娟庄海燕
Owner UNIV OF JINAN
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