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Innocent treatment method for leaded glass of abandoned cathode ray tube

A technology of harmless treatment and cathode ray tube, which is applied in the field of solid waste resource utilization, can solve the problems of difficult application and promotion, complicated extraction process, strict equipment conditions, etc., and achieves easy implementation, mature process technology, unique The effect of secondary pollution

Active Publication Date: 2013-09-04
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent requires harsh reaction conditions such as vacuum and the supporting extraction process is complicated, the equipment conditions are strict, and the extraction cost is high, so this technology is difficult to apply and promote in industry

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for harmless treatment of waste cathode ray tube lead-containing glass, comprising the following steps:

[0020] 1) Remove the coating on the inner and outer surfaces of the cone glass separated by the CRT cone screen, dry it, and coarsely crush it into particles with a particle size of less than 1mm. Take 200g of the coarsely crushed glass and put it into a ball milling tank of a planetary high-energy ball mill;

[0021] Through XRF analysis, its chemical composition is as shown in Table 1:

[0022] Table 1

[0023] chemical components SiO 2 PbO K 2 o Na 2 o Fe 2 o 3 MgO al 2 o 3 CaO content% 48.9 25.8 8.7 5.9 0.29 2.1 3.7 3.9

[0024] 2) As mentioned above, add 8g of silicon carbide, 3.2g of sodium carbonate and 0.8g of sodium nitrate into the ball mill, and activate the ball mill for 4 hours to obtain the mixed material and put it in a vacuum drying oven for drying at 110°C for later use;

[0025] 3) Put t...

Embodiment 2

[0028] A method for harmless treatment of waste cathode ray tube lead-containing glass, comprising the following steps:

[0029] 1) Remove the coating on the inner and outer surfaces of the cone glass separated by the CRT cone screen, dry it, and roughly crush it into particles with a particle size of less than 1mm, and put it into the ball mill tank of a planetary high-energy ball mill;

[0030] Through XRF analysis, its chemical composition is as shown in Table 2:

[0031] Table 2

[0032] chemical components SiO 2 PbO K 2 o Na 2 o Fe 2 o 3 MgO Al 2 o 3 CaO content% 41.9 34.3 8.4 6.1 0.14 2.5 2.9 3.4

[0033] 2) Add 8g of silicon carbide, 3.2g of sodium carbonate, and 0.8g of sodium nitrate into the ball mill as above, and activate the ball mill for 6 hours to obtain the mixed material and put it in a vacuum drying oven for drying at 110°C for later use;

[0034] 3) Put the above mixed material into the furnace for 1 h...

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Abstract

An innocent treatment method for leaded glass of a abandoned cathode ray tube comprises the following steps: 1) washing and drying CRT cone glass, carrying out coarse crushing on the CRT cone glass to form particles, and placing the particles into a ball mill; 2) adding reducing agents and alkaline additives, carrying out activation on ball mill machinery for 4-6h to obtain mixed materials; 3) placing the mixed materials in a smelter to be roasted for 1h under the condition of the temperature of 900 DEG C to 1000 DEG C and nitrogen gas to obtain glass with lead content smaller than 2% on the upper layer of the ball mill and highly purified metallic lead on the bottom portion of the ball mill, and carrying out breaking and separation after the glass and the metallic lead are cooled. The innocent treatment method for the leaded glass of the abandoned cathode ray tube has the advantages that the high-energy ball mill is adopted as mechanical activation equipment, is high in activation efficiency, and can effectively reduce the reduction temperature of the CRT cone glass; the lead in the cone glass can be effectively recovered, and environmental pollution is reduced; the separated metallic metal and lead-free glass can be reused; the method is simple in process, convenient to operate, free of secondary pollution, easy to apply, and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a new technology for resource utilization of solid waste, in particular to a harmless treatment method for waste cathode ray tube lead-containing glass. Background technique [0002] A CRT display is a display using a cathode ray tube (Cathode Ray Tube), which has been widely used in analog display devices such as televisions, computers, and oscilloscopes. With the continuous innovation of display technology, a large number of new displays such as liquid crystal displays, flat panel displays, etc. continue to replace traditional CRT displays, resulting in a sharp decline in their output. At present, most of the domestic CRT display production lines have been discontinued. The traditional closed-loop recycling method—waste CRT After dismantling, cleaning and other pretreatments, it is reused to manufacture CRT glass bulbs, which can no longer meet the needs of the new era, resulting in the accumulation of a large number of CRT ...

Claims

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Application Information

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IPC IPC(8): H01J9/52C22B7/00C22B13/00C03C3/04
CPCY02P10/20Y02W30/60Y02W30/82
Inventor 于宏兵杨磊邱明英王庆
Owner NANKAI UNIV
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