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Method for extracting lead and silicon from CRT (Cathode Ray Tube) cone glass with strong alkali by adopting mechanical activation process

A technology of mechanical activation and conical glass, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problems of high back-end processing costs, high energy consumption, complex equipment, etc., and achieve easy large-scale industrial production, process The effect of simple process and mild reaction conditions

Inactive Publication Date: 2013-07-24
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are some technical bottlenecks and environmental problems in the extraction method of lead, and it is difficult to realize industrialization
For example, the subcritical method has high costs and lacks market promotion prospects; the pyrometallurgy has problems such as large amount of waste residue, high energy consumption, and high back-end treatment costs; the high-temperature reduction method has problems such as high energy consumption and complicated equipment; The requirements for experimental equipment are relatively high, and metallic lead is volatilized in gaseous form, which is highly toxic and consumes high energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Step (1). Add the CRT cone glass to the jaw crusher for coarse crushing to obtain a coarsely crushed CRT cone glass with a diameter of 1 mm; then add the coarsely crushed CRT cone glass to a planetary ball mill for grinding, with a ball-to-material ratio of 3 : 1, ball mill rotating speed 600 r / min, ball milling time 60min, obtain 100 order grinding CRT cone glass;

[0015] Step (2). Add 1 kg of ground CRT cone glass to 5 L of sodium hydroxide solution with a concentration of 9 mol / L, react at 70° C. for 300 min, filter and separate to obtain leaching residue and leaching solution containing lead and silicon. .

[0016] In Example 1, the leaching rate of lead was 80%, and the leaching rate of silicon was 75%.

Embodiment 2

[0018] Step (1). The CRT cone glass is added to the jaw crusher for coarse crushing to obtain a coarsely broken CRT cone glass with a diameter of 1.2mm; then the coarsely broken CRT cone glass is added to a planetary ball mill for grinding, and the ball-to-material ratio is 10:1, ball mill speed 500 r / min, ball milling time 150 min, to obtain 110-mesh ground CRT cone glass;

[0019] Step (2). Add 1 kg of ground CRT cone glass to 8 L of potassium hydroxide solution with a concentration of 8 mol / L, react at 80° C. for 280 min, filter and separate to obtain leaching residue and leaching solution containing lead and silicon.

[0020] In Example 2, the leaching rate of lead is 95%, and the leaching rate of silicon is 90%.

Embodiment 3

[0022] Step (1). The CRT cone glass is added to the jaw crusher for coarse crushing to obtain a coarsely crushed CRT cone glass with a diameter of 1.4mm; then the coarsely crushed CRT cone glass is added to a planetary ball mill for grinding, and the ball-to-material ratio is 15:1, ball mill speed 400 r / min, ball milling time 200 min, to obtain 120 mesh ground CRT cone glass;

[0023] Step (2). Add 1 kg of ground CRT cone glass to 10 L of lithium hydroxide solution with a concentration of 7.5 mol / L, react at 100 ° C for 260 min, and filter and separate to obtain leaching residue and leaching solution containing lead and silicon.

[0024] In Example 3, the leaching rate of lead was 87%, and the leaching rate of silicon was 82%.

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Abstract

The invention discloses a method for extracting lead and silicon from CRT (Cathode Ray Tube) cone glass with strong alkali by adopting a mechanical activation process. The existing CRT cone glass lead extraction technology is complicated in equipment, high in energy consumption and easily produces secondary pollution. The method comprises the steps of: coarsely grinding CRT cone glass to obtain ground CRT cone glass with 100-200 meshes; adding the ground CRT cone glass into alkali liquor with concentration of 2-9mol / L, reacting for 60-300 minutes at 70-250 DEG C, and then filtering and separating to obtain leached residues and lead- and silicon-containing leachate. The leaching rate of lead achieves 80-95%, and the leaching rate of silicon achieves 75-95%. The CRT cone glass is subjected to activation pretreatment and then alkali liquor leaching by adopting the mechanical activation technology, thereby achieving the effects of mild reaction conditions, simple process flow and high lead and silicon leaching rates; and large-scale industrialized production is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of hazardous waste treatment and resource utilization, and particularly relates to a method for strengthening alkali leaching of lead and silicon in CRT cone glass by a mechanical activation method. Background technique [0002] Cathode ray tube (CRT) is the earliest and most widely used display technology to achieve industrial production. It has the advantages of mature technology, high reliability, and long service life. Therefore, it is often used as the core display component of electronic and electrical equipment such as televisions and computer monitors. At present, there are about 550 million TV sets in my country, the vast majority of which are CRT TV sets, and the number of computer CRT monitors has exceeded 40 million sets, and a large number of electronic and electrical products have entered the peak period of elimination and scrapping. [0003] The CRT glass bulb is an important part of the displ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B13/00C01B33/021
CPCY02P10/20
Inventor 姚志通张春晓张素玲席永清
Owner HANGZHOU DIANZI UNIV
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