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Comprehensive recycling method of waste and old compact discs

A recycling method and CD-ROM technology, applied in the direction of plastic recycling, recycling technology, process efficiency improvement, etc., can solve problems such as not suitable for subsequent processing and production of high-end products, affecting polycarbonate content, difficult to remove reflective layer, etc., to achieve saving Energy consumption and cost, ease of operation, effect of reducing environmental pressure

Inactive Publication Date: 2012-07-04
北京泰合源通生物科技有限公司
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  • Abstract
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  • Claims
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Problems solved by technology

The above method crushes the waste discs, cleans them, and re-granulates them for use. However, the fragments have lost the shape of discs, and it is difficult to remove non-polycarbonate layers such as reflective layers. The color of the obtained polycarbonate will be much worse, thereby affecting the content of polycarbonate. , not suitable for subsequent processing and production of high-end products, and the discharge of various metals in the waste liquid will also pollute the environment and waste resources

Method used

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  • Comprehensive recycling method of waste and old compact discs
  • Comprehensive recycling method of waste and old compact discs

Examples

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Effect test

Embodiment 1

[0038] (1), the waste DVD disc is polished with a mechanical grinding roller in a closed environment to wear off the printed layer, protective layer and reflective layer on the surface, collect the dust and solid residues that have been worn away, and use a 5% nitric acid solution with a mass fraction After soaking for 12 hours, the mass of the nitric acid solution is 2.5 times the mass of the dust and solid residue. During the soaking process, it is heated to about 50°C, and the residue is filtered. The acid soaking solution containing precious metals is directly sold as a commodity or the precious metals in it are obtained through conventional refining methods.

[0039] (2), the optical disc base after the surface layer is worn away is placed in a sodium hydroxide solution with a mass percentage content of 20% for soaking, the quality of the sodium hydroxide solution is 3 times that of the optical disc base, and the soaking solution is heated to about 50 ℃, the soaking time i...

Embodiment 2

[0044] (1), the waste CD-R disc is polished with a mechanical grinding roller in a closed environment to wear off the printed layer, protective layer and reflective layer on the surface, collect the dust and solid residues that have been worn away, and use a mass fraction of 8% Soak in sulfuric acid solution for 10 hours, the mass of sulfuric acid solution is 1.5 times the mass of dust and solid residue, heated to about 60°C during the soaking process, the residue is filtered, and the acid soaking solution containing precious metals is directly sold as a commodity or obtained through conventional refining methods precious metals.

[0045] (2), the disc base after the surface layer has been worn off is placed in a potassium hydroxide solution with a mass percentage of 25% for soaking, the quality of the potassium hydroxide solution is twice that of the disc base, and the soaking solution is heated to about 40 ℃, the soaking time is controlled at 15 minutes, then take out the di...

Embodiment 3

[0050] (1), the waste DVD disc is polished with a mechanical grinding roller in a closed environment to grind off the printed layer, protective layer and reflective layer on the surface, collect the dust and solid residues that have been worn away, and use a 10% hydrochloric acid solution with a mass fraction After soaking for 12 hours, the mass of the hydrochloric acid solution is twice the mass of the dust and solid residue. During the soaking process, it is heated to about 60°C, and the residue is filtered. The acid soaking solution containing precious metals is directly sold as a commodity or the precious metals in it are obtained through conventional refining methods.

[0051] (2), the optical disc base after the surface layer has been worn off is placed in a sodium hydroxide solution with a mass percentage of 25% for soaking, the quality of the sodium hydroxide solution is 1.5 times that of the optical disc base, and the soaking solution is heated to about 35 ℃, the soaki...

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Abstract

The invention relates to a comprehensive recycling method of waste and old compact discs. By carrying out the steps of polishing, acid and alkali solution soaking, alcohol solvent soaking, smashing, washing, chloroform or toluene soaking, solid precipitation and the like to the waste and old compact discs, precious metal, dye and polycarbonate in the waste and old compact discs are recycled. By means of the technical scheme, the waste and old compact discs are comprehensively utilized, useful materials in the waste and old compact discs are recycled, the recycling rate is high, and recycled products are good in purity. Besides, the comprehensive recycling method is simple in process and simple and convenient to operate, reduces energy consumption, saves cost, and is ideal.

Description

technical field [0001] The invention relates to the field of recycling waste optical discs, in particular to a comprehensive recovery method for recovering precious metals, dyes and polycarbonate from waste optical discs. Background technique [0002] It is reported that the world consumes millions of CDs every year for listening to music, watching movies, and storing information. CD not only enriches people's spiritual and cultural life, but also brings a lot of convenience to people. But how to dispose of these waste discs has become a problem that makes people scratch their heads. In the past, these used CDs were sent to waste incinerators for destruction, and some were buried in the ground. However, optical discs are very different from other garbage. 90% of them are polycarbonate, which is a good thermoplastic material, and the outer packaging of optical discs can be 100% recycled. How to comprehensively recycle waste optical discs research has become a very valuable...

Claims

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Application Information

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IPC IPC(8): C08J11/06C08L69/00C09B67/10C09B67/12C22B7/00C22B3/06C22B11/00
CPCY02W30/62Y02P10/20
Inventor 高源
Owner 北京泰合源通生物科技有限公司
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