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A kind of treatment method of waste TV fluorescent powder

A treatment method and TV technology, applied in the field of waste treatment, can solve the problems of long treatment process, large amount of sewage generation, low recovery rate, etc., and achieve the effect of short process, high recovery rate and short process flow

Active Publication Date: 2020-07-14
王柯娜
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] At present, the conventional treatment method is a wet process, which uses acid dissolution to dissolve valuable metals, and then separates zinc, rare earth and other elements through various separation methods. Due to the high content of zinc, the separation process of zinc and rare earth elements Long, and the recovery rate is not high, but this process has the disadvantages of long treatment process and large amount of sewage

Method used

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  • A kind of treatment method of waste TV fluorescent powder
  • A kind of treatment method of waste TV fluorescent powder
  • A kind of treatment method of waste TV fluorescent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A processing method for waste TV fluorescent powder, which comprises the following steps:

[0045] (1) Add the collected waste TV fluorescent powder to carbon powder, mix evenly, and then put it into a high-temperature furnace for calcination at 950°C for 4.5 hours. At the same time, the flue gas is drawn out and condensed, and dust is collected through a dust collection bag to obtain a dust collection material , and then the dust-collected flue gas is sprayed and absorbed by an alkali solution to obtain an absorption liquid;

[0046] (2) Dissolve the calcined material in a sulfuric acid solution, react at a temperature of 80°C for 2.5h, then filter to obtain the filtrate and filter residue, add phosphate to the filtrate, and react for 1.5h at a pH of 2.3 and a temperature of 70°C. Then filter to obtain yttrium phosphate and mother liquor;

[0047] (3) Add the filter residue obtained in step (2) to sulfuric acid solution, slurry and stir, then add hydrogen peroxide, re...

Embodiment 2

[0065] A processing method for waste TV fluorescent powder, which comprises the following steps:

[0066] (1) Add the collected waste TV fluorescent powder to carbon powder, mix evenly, and then put it into a high-temperature furnace for calcination at 960°C for 4.5 hours. At the same time, the flue gas is drawn out and condensed, and dust is collected through a dust collection bag to obtain a dust collection material , and then spray and absorb the dust-collected flue gas through an alkali solution to obtain an absorption liquid;

[0067] (2) Dissolve the calcined material in a sulfuric acid solution, react at a temperature of 80°C for 2.5 hours, then filter to obtain the filtrate and filter residue, add phosphate to the filtrate, react at a pH of 2.4, and a temperature of 70°C for 2 hours, then Filter to obtain yttrium phosphate and mother liquor;

[0068] (3) Add the filter residue obtained in step (2) to sulfuric acid solution, slurry and stir, then add hydrogen peroxide,...

Embodiment 3

[0086] A processing method for waste TV fluorescent powder, which comprises the following steps:

[0087] (1) Add the collected waste TV fluorescent powder to carbon powder, mix evenly, and then put it into a high-temperature furnace for calcination at 920°C for 4.5 hours. At the same time, the flue gas is drawn out and condensed, and dust is collected through a dust collection bag to obtain a dust collection material , and then spray and absorb the dust-collected flue gas through an alkali solution to obtain an absorption liquid;

[0088] (2) Dissolve the calcined material in a sulfuric acid solution, react at a temperature of 80°C for 2.5h, then filter to obtain the filtrate and filter residue, add phosphate to the filtrate, and react for 1.5h at a pH of 2.4 and a temperature of 70°C. Then filter to obtain yttrium phosphate and mother liquor;

[0089] (3) Add the filter residue obtained in step (2) to sulfuric acid solution, slurry and stir, then add hydrogen peroxide, reac...

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Abstract

The invention discloses a processing method of waste television fluorescent powder. The collected waste television fluorescent powder is added into carbon powder and is uniformly mixed, and then the mixture is put into a high-temperature furnace to be calcined; meanwhile, flue gas is led out and condensed, and dust collecting is carried out through a dust collecting cloth bag to obtain a dust collecting material; the calcined material is added into a sulfuric acid solution for dissolving, then filtering is carried out to obtain a filtrate and a filter residue, and phosphate is added to the filtrate to obtain yttrium phosphate and mother liquor; and a sulfuric acid solution and hydrogen peroxide are added into the obtained filter residue to react, then filtering is carried out to obtain a first filtrate and a first filter residue, the first filter residue is returned to be mixed with the waste television fluorescent powder to be subjected to calcination, and sodium oxalate is added to the obtained first filtrate to obtain europium oxalate and a second filtrate; and the obtained mother liquor and the second filtrate are mixed, then sodium hydroxide is added, a flocculating agent is added, and then filtering is carried out to obtain wastewater slag and outwards-drained water. The processing method is simple in process and short in flow, the separation of rare earth is realized without the means of extraction and the like, the operation is simple, and the recovery rate of each element is high.

Description

technical field [0001] The invention relates to a treatment method for waste TV fluorescent powder, belonging to the technical field of waste treatment. Background technique [0002] Electronic waste, commonly known as "electronic waste", refers to electrical appliances or electronic equipment that have been discarded and no longer used, mainly including household appliances such as refrigerators, air conditioners, washing machines, and televisions, and communication electronic products such as computers. E-waste needs to be handled carefully. In some developing countries, the phenomenon of e-waste is very serious, and the environmental pollution caused threatens the health of local residents. [0003] As a complex of resources, electronic waste contains many precious resources. The reuse and recycling of electronic waste is an important way to solve the problems of resource shortage and environmental pollution. By improving the resource utilization rate, turning waste into...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B59/00C22B19/30C22B19/20
CPCY02P10/20
Inventor 王柯娜
Owner 王柯娜