CN103521500A - Method for recovering europium hydroxide from discarded displays - Google Patents
Method for recovering europium hydroxide from discarded displays Download PDFInfo
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- CN103521500A CN103521500A CN201310495136.XA CN201310495136A CN103521500A CN 103521500 A CN103521500 A CN 103521500A CN 201310495136 A CN201310495136 A CN 201310495136A CN 103521500 A CN103521500 A CN 103521500A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/82—Recycling of waste of electrical or electronic equipment [WEEE]
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The ownership of color televisions in China increases rapidly. In 1980, 9.02 million televisions are owned by Chinese people and the ownership progressively increases by 10-20 million annually. The number of color televisions owned by Chinese people is 185 million at the end of 1990, and is 400 million in 2009. Generally, a television is used for 6-8 years, and then 200 million televisions fall into disuse annually. After metal devices in the televisions are removed and metals are recovered, a large number of displays are thrown away. The displays not only occupy large spaces, but also can release toxic substances and seriously pollute the environment if the displays are broken by accident. According to a method for recovering europium hydroxide from discarded displays, europium hydroxide is recovered by process steps of dedusting, smashing, alkaline hydrolysis, separation, evaporation, neutralization and the like, thereby alleviating pollution and achieving comprehensive utilization of wastes. The method is a good project worthy of popularization.
Description
Technical field
What the present invention proposed is the method for europium hydroxide that reclaims from useless display.
Background technology
The colour television set owning amount rapid development of China, within 1980, owning amount is 9,020,000, and with ten thousand of 1000-2000, increase progressively every year, at the bottom of nineteen ninety, 1.85 hundred million of colour television set owning amounts, within 2009, colour television set owning amount is 400,000,000, general television applications 6-8 calculates, just there are every year 200000000 television sets to be eliminated, metal device in television set reclaims metal after removing, and a large amount of displays is thrown away, and it not only takes up room, after smashing because of carelessness, understand some noxious material and emit, it can serious environment pollution.
The method that reclaims europium hydroxide from useless display is to adopt dedusting, pulverizing, and the operations such as alkaline hydrolysis, separation, evaporation, neutralization reclaim and obtain europium hydroxide, have reduced pollution, and refuse has obtained comprehensive utilization.It is the good project being worthy to be popularized.
Summary of the invention
It is the method for europium hydroxide that reclaims from useless display that the present invention proposes.The concrete scheme adopting is:
Dedusting, pulverizing and screening operation
With alcohol, wipe the dust of display, then display is broken into pieces to (preventing its blast), add in ball mill, pulverize 20-30 minute, powder is sieved with 200 object sub-sieves.
Alkaline hydrolysis and separation circuit
Above-mentioned powder and 40% NaOH are added in reactor, and reinforced mass ratio is 1:1.By heat-conducting oil heating, heating-up temperature is 140-180 ℃, and the heat time is 50-100 minute.
Filter progress
Above-mentioned alkali solution liquid is added in the hot water of 8 times of volumes; Cooling filter with Buchner funnel afterwards stirs.
Washing and filter progress
The dissolving with hydrochloric acid that above-mentioned filter cake is added to 1:1, discards filter cake (filter cake can return), contains Europium chloride in filtrate.
Evaporization process
The volume of liquid is evaporated to 1/10 of original volume, removes unnecessary hydrochloric acid.
Neutralization, filter progress
With ammonia neutralization, filter to pH=6.8, continue to be neutralized to pH=7.8 and filter and obtain europium hydroxide.
Accompanying drawing explanation
Fig. 1 for reclaiming the method process flow chart of europium hydroxide from useless display.
The specific embodiment
Dedusting, pulverizing and screening operation
With alcohol, wipe the dust of display, then display is broken into pieces to (preventing its blast), add in ball mill, pulverize 20-30 minute, powder is sieved with 200 object sub-sieves.
Alkaline hydrolysis and separation circuit
200 grams, 200 grams, above-mentioned powder and 40% NaOH is added in the white steel reactor of 1 liter, by heat-conducting oil heating, heating-up temperature is 160 ℃, and the heat time is 70 minutes.
Filter progress
Above-mentioned alkali solution liquid is poured in the hot water of 1600 milliliters; Cooling filter with Buchner funnel afterwards stirs.
Washing and filter progress
The dissolving with hydrochloric acid that above-mentioned filter cake is added to 100 milliliters of 1:1, discards filter cake (filter cake can return), contains Europium chloride in filtrate.
Evaporization process
By liquid evaporation to volume, be 10 milliliters, remove unnecessary hydrochloric acid.
Neutralization, filter progress
With ammonia neutralization, filter to pH=6.8, continue to be neutralized to pH=7.8 and filter and obtain europium hydroxide.
Claims (6)
- Dedusting, pulverizing and screening operationWith alcohol, wipe the dust of display, then display is broken into pieces to (preventing its blast), add in ball mill, pulverize 20-30 minute, powder is sieved with 200 object sub-sieves.
- Alkaline hydrolysis and separation circuitAbove-mentioned powder and 40% NaOH are added in reactor, and reinforced mass ratio is 1:1, and by heat-conducting oil heating, heating-up temperature is 140-180 ℃, and the heat time is 50-100 minute.
- Filter progressAbove-mentioned alkali solution liquid is added in the hot water of 8 times of volumes; Cooling filter with Buchner funnel afterwards stirs.
- Washing and filter progressThe dissolving with hydrochloric acid that above-mentioned filter cake is added to 1:1, discards filter cake (filter cake can return), contains Europium chloride in filtrate.
- Evaporization processThe volume of liquid is evaporated to 1/10 of original volume, removes unnecessary hydrochloric acid.
- Neutralization, filter progressWith ammonia neutralization, filter to pH=6.8, continue to be neutralized to pH=7.8 and filter and obtain europium hydroxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310495136.XA CN103521500A (en) | 2013-10-22 | 2013-10-22 | Method for recovering europium hydroxide from discarded displays |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310495136.XA CN103521500A (en) | 2013-10-22 | 2013-10-22 | Method for recovering europium hydroxide from discarded displays |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103521500A true CN103521500A (en) | 2014-01-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310495136.XA Pending CN103521500A (en) | 2013-10-22 | 2013-10-22 | Method for recovering europium hydroxide from discarded displays |
Country Status (1)
| Country | Link |
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| CN (1) | CN103521500A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101307391A (en) * | 2008-07-11 | 2008-11-19 | 广州有色金属研究院 | Process for recovering rare earth element in waste florescent lamps |
| CN102115822A (en) * | 2010-11-18 | 2011-07-06 | 吴泉锦 | Method for recovering rare earth oxide from fluorescent powder and polishing powder waste |
| TWI352730B (en) * | 2007-10-03 | 2011-11-21 | Univ Da Yeh | A method for the recycling of fluorescent powder o |
| CN102745735A (en) * | 2012-05-02 | 2012-10-24 | 江西华科稀土新材料有限公司 | Method for recovering rare earth elements from waste red phosphor |
| JP5120963B2 (en) * | 2008-06-04 | 2013-01-16 | 独立行政法人産業技術総合研究所 | Recycling method of waste phosphor |
-
2013
- 2013-10-22 CN CN201310495136.XA patent/CN103521500A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI352730B (en) * | 2007-10-03 | 2011-11-21 | Univ Da Yeh | A method for the recycling of fluorescent powder o |
| JP5120963B2 (en) * | 2008-06-04 | 2013-01-16 | 独立行政法人産業技術総合研究所 | Recycling method of waste phosphor |
| CN101307391A (en) * | 2008-07-11 | 2008-11-19 | 广州有色金属研究院 | Process for recovering rare earth element in waste florescent lamps |
| CN102115822A (en) * | 2010-11-18 | 2011-07-06 | 吴泉锦 | Method for recovering rare earth oxide from fluorescent powder and polishing powder waste |
| CN102745735A (en) * | 2012-05-02 | 2012-10-24 | 江西华科稀土新材料有限公司 | Method for recovering rare earth elements from waste red phosphor |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140122 |