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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  • Application Information

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Problems solved by technology

This patent requires harsh reaction conditions such as vacuum and the supporting extraction process is complicated, the equip

Method used

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Example Embodiment

[0018] Example 1:

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

[0020] 1) The inner and outer surface coatings of the cone glass separated by the CRT cone screen are removed, dried, and coarsely crushed into particles with a particle size of less than 1mm. Take 200g of the coarsely crushed glass and put it into the ball mill tank of the planetary high-energy ball mill;

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

[0022] Table 1

[0023] chemical componentsSiO 2 PbOK 2 O Na 2 O Fe 2 O 3 MgOAl 2 O 3 CaO content% 48.925.88.75.90.292.13.73.9

[0024] 2) Add 8g of silicon carbide, 3.2g of sodium carbonate and 0.8g of sodium nitrate to the ball mill, and mechanically activate the ball mill for 4 hours to obtain the mixture and put it in a vacuum drying oven at 110°C for drying for use;

[0025] 3) Put the above mixture into a furnace for 1 hour at 1000°C and a flow rate o...

Example Embodiment

[0027] Example 2:

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

[0029] 1) The inner and outer surface coatings of the cone glass separated by the CRT cone screen are removed, dried, coarsely broken into particles with a particle size of less than 1mm, and placed in the ball mill tank of the planetary high-energy ball mill;

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

[0031] Table 2

[0032] chemical componentsSiO 2 PbOK 2 O Na 2 O Fe 2 O 3 MgOAl 2 O 3 CaO content% 41.934.38.46.10.142.52.93.4

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

[0034] 3) Put the above-mentioned mixture into a furnace for 1 hour at 1000°C and a nitrogen gas flow rate of 150ml / m...

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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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