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Process for preparing microcrystalline glass by using waste CRT glass residues and phosphor

A glass-ceramic and phosphor technology, which is applied in the field of waste CRT treatment, can solve the problems of glass slag polluting the environment, etc., and achieve the effects of easy mass production, simple operation and reduction of environmental pollution.

Active Publication Date: 2015-03-18
武汉格林循环电子废弃物处置有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to solve the problem that the glass slag produced by CRT cleaning pollutes the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The process of preparing glass-ceramics by using waste CRT glass slag and fluorescent powder includes the following steps:

[0018] (1) Take cathode ray tube fluorescent powder (CRT fluorescent powder), add dilute sulfuric acid with a mass concentration of 5% to 15% at a solid-to-liquid ratio of 1:20, dissolve at a temperature of 80 to 90°C, and fully stir for 1 to 3 hours. Suction filtration to obtain a filtrate containing rare earth ions;

[0019] (2) get mass concentration 80% hydrofluoric acid solution (the amount of hydrofluoric acid is: the solid-to-liquid ratio of original rare earth (i.e. the fluorescent powder in step (1)) and hydrofluoric acid is 1: 2) add described containing The filtrate of rare earth ions reacts to generate rare earth fluorides, and is suction filtered. The rare earth fluorides remain in the filter cake, and the filter cake is washed 1 to 5 times to obtain a filter cake containing pure rare earth fluorides and a filtrate containing non-rare...

Embodiment 2

[0024] (1) Take CRT fluorescent powder, add dilute sulfuric acid with a mass concentration of 10% according to a solid-liquid ratio of 1:15, dissolve at a temperature of 80° C., fully stir for 3 hours, and suction filter to obtain a filtrate containing rare earth ions;

[0025] (2) get mass concentration 70% hydrofluoric acid solution (the amount of hydrofluoric acid is: the solid-liquid ratio of original rare earth (i.e. the fluorescent powder in step (1)) and hydrofluoric acid is 1: 2) add described containing The filtrate of rare earth ions reacts to generate rare earth fluorides, and is suction filtered. The rare earth fluorides remain in the filter cake, and the filter cake is washed 3 times to obtain a filter cake containing pure rare earth fluorides and a filtrate containing non-rare earth ions. Put the rare earth fluoride into an oven at 55°C and dry it for 6 hours.

[0026] (3) Clean, filter and grind the glass residue from the CRT cleaning line to 0.8mm.

[0027] (4...

Embodiment 3

[0030] (1) Take CRT fluorescent powder, add dilute sulfuric acid with a mass concentration of 5% according to the solid-to-liquid ratio of 1:25, dissolve at a temperature of 90° C., fully stir for 1 hour, and suction filter to obtain a filtrate containing rare earth ions;

[0031] (2) get mass concentration 80% hydrofluoric acid solution (the amount of hydrofluoric acid is: the solid-to-liquid ratio of original rare earth (i.e. the fluorescent powder in step (1)) and hydrofluoric acid is 1: 2) add described containing The filtrate of rare earth ions reacts to generate rare earth fluorides, and is suction filtered. The rare earth fluorides remain in the filter cake, and the filter cake is washed 5 times to obtain a filter cake containing pure rare earth fluorides and a filtrate containing non-rare earth ions. Put the rare earth fluoride into an oven at 45°C, and dry it for 7 hours.

[0032] (3) Clean, filter and grind the glass residue from the CRT cleaning line to 0.5mm.

[0...

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PUM

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Abstract

The invention relates to a process for preparing microcrystalline glass by using waste CRT glass residues and phosphor. The process comprises the following steps: (1) dissolving phosphor in CRT with dilute sulfuric acid, adding HF to convert the dissolved rare earth ions into rare earth fluoride precipitates, filtering and drying the precipitates; (2) cleaning, filtering, and grinding the CRT glass residues, mixing the CRT glass residues with the rare earth fluoride and sodium fluoride in proportion, wherein the mixture comprises the following materials by mass: 62%-68% of glass residues, 28%-32% of sodium fluoride, and 4%-6% of rare earth fluoride, grinding to mix well; (3) roasting the materials at a temperature of 900-1200 DEG C for 20-60 min, pouring glass water into a stainless steel plate, cooling in a high temperature furnace at 380-450 DEG C for 1-2 hours, then naturally cooling to room temperature to obtain the microcrystalline glass. The invention not only recycles glass residues, but also makes use of characteristics of rare earth elements to prepare the material with good performance.

Description

technical field [0001] The invention relates to the treatment of waste CRT, in particular to a process for preparing glass-ceramic by using waste CRT glass slag and fluorescent powder. Background technique [0002] The glass in the cathode ray tube (CRT) is divided into two types: flat glass and conical glass due to the difference in lead content. According to the guidelines for the qualification examination and licensing of waste electrical and electronic product disposal enterprises: , the cone and screen glass should be separated and cleaned. Since June 2009, my country's home appliance product "trade-in" policy was implemented. As of the end of May 2010, the total number of waste electronic and electrical products recycled was 14.79 million units, of which about 12 million monitors were recycled, almost all of which were CRT monitors. The fluorescent powder of the display is rich in rare earth elements. If it is discarded, it will pollute the environment and waste resour...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/16C03C6/02C03C4/12
Inventor 马琳石玉洁陈艳红王勤苏陶贵程文武
Owner 武汉格林循环电子废弃物处置有限公司