Process for synthesizing nano-lead from waste cathode-ray tube (CRT) lead-containing glass by one-step method

A cathode ray tube and cathode ray technology, applied in the field of waste resource recycling, can solve the problems of high technical equipment requirements, long processing time, high energy consumption, etc., and achieve the effect of broad application value

Inactive Publication Date: 2011-04-06
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common CRT glass deleading technologies mainly include strong acid immersion, chemical reagent extraction after ball milling, acid leaching after supercritical pretreatment, etc., b

Method used

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  • Process for synthesizing nano-lead from waste cathode-ray tube (CRT) lead-containing glass by one-step method
  • Process for synthesizing nano-lead from waste cathode-ray tube (CRT) lead-containing glass by one-step method
  • Process for synthesizing nano-lead from waste cathode-ray tube (CRT) lead-containing glass by one-step method

Examples

Experimental program
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Effect test

Embodiment 1

[0017] A process for synthesizing nano-lead in one step from leaded glass in waste cathode ray tubes, specifically comprising the following steps:

[0018] Such as figure 1 As shown, after removing the iron oxide layer and graphite layer on the inner and outer layers of the lead-containing cone glass, use a planetary ball mill to grind the cone glass to 200 mesh, and then put the cone glass powder and 200-mesh carbon powder in the ball mill according to the mass ratio of 9:1 Ball mill to mix evenly. Weigh 5 grams of uniformly mixed powder in the quartz boat, then put the quartz boat into the vacuum furnace, and pass an appropriate amount of argon to remove the oxygen in the furnace. After the oxygen is removed, close the argon valve and open the vacuum furnace temperature riser to The furnace body is heated at a rate of 15°C / min. After the temperature in the furnace reaches 1000°C, open the vacuum device, the argon gas valve and the cooling water, control the temperature in ...

Embodiment 2

[0020] A process for synthesizing nano-lead in one step from leaded glass in waste cathode ray tubes, specifically comprising the following steps:

[0021] Such as figure 1 As shown, after removing the iron oxide layer and graphite layer on the inner and outer layers of the cone glass, use a planetary ball mill to grind to 200 mesh, and then mix the glass powder and 200 mesh carbon powder in the ball mill according to the mass ratio of 10:1. Weigh 500 grams of uniformly mixed powder in a high-temperature-resistant stainless steel container, then put it into a vacuum furnace, pass an appropriate amount of argon to remove the oxygen in the furnace, close the argon valve after the oxygen is removed, and open the vacuum furnace temperature riser to 15 The furnace body is heated at a rate of ℃ / min. After the furnace temperature reaches 1000°C, open the vacuum device, argon gas valve and cooling water, control the furnace temperature at 1000°C, vacuum degree of 1000Pa, distillation...

Embodiment 3

[0023] A process for synthesizing nano-lead in one step from leaded glass in waste cathode ray tubes, specifically comprising the following steps:

[0024] (1) Pre-treatment process: Use negative pressure suction and desorption technology to remove the iron oxide layer and graphite layer on the inner and outer layers with high lead content, and then use a jaw crusher to crush the cone glass into less than 2 mm granular, and then use a planetary ball mill to grind the glass particles to about 200 mesh.

[0025] (2) Batching process: add carbon powder into the ball mill, the mass ratio of glass powder and carbon powder is 8:1, continue ball milling, so that the fineness of the mixture reaches about 200 mesh.

[0026] (3) Heat treatment process: Take 2 kg of the prepared mixture and put it into a vacuum furnace, pass argon gas to remove the oxygen in the furnace, close the argon valve and open the vacuum furnace heating device after the oxygen is removed, at a rate of 10 °C / min ...

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Abstract

Aiming at the current situations that in the electronic waste treatment process, high lead-containing cathode-ray tube (CRT) cone-glass is short of recycling technologies, is optionally discarded and stacked and severely pollutes the environment, the invention provides a process for removing lead in the lead-containing cone-glass, enabling the lead-containing cone-glass to be harmless and simultaneously preparing nano-lead particles with high added values. The invention is characterized by comprising the following steps: properly pre-treating the lead-containing glass, and then, adding a reducing agent; removing the lead in the cone-glass under certain atmospheric conditions; and condensing and collecting the removed lead on a special collector to form nano-lead, thereby realizing the purposes of removing the lead and synthesizing the nano-lead in one step. The process has the characteristics of controllable particle diameter of nano-particles and low cost and is simple and convenientin operation, and the lead removing rate can reach more than 95%, the purity of the prepared nano-lead is more than 95%, and the particle diameter is 5nm-15nm. The product has wide application prospects in production of high radiation protection materials, superconducting materials and special industrial catalysts.

Description

technical field [0001] The invention relates to recycling of waste resources, belongs to the new technology of resource utilization of solid waste in the field of environmental protection and resource comprehensive utilization, and is especially suitable for pollution control and high value-added resource utilization of waste lead-containing glass. The products produced have broad application value in the production of high radiation protection materials, superconducting materials and special industrial catalysts. Background technique [0002] Nano-lead (Pb) is one of the important raw materials in high-energy radiation protection, industrial catalysts, lubricating materials, superconducting materials and other fields. Lead is often used as an anti-high-energy radiation material at home and abroad, but because the density of lead is too high (11.3g / cm 3 ), causing the prepared lead-containing radiation protection materials to appear very bulky and inconvenient to operate, s...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B13/00
CPCY02P10/20
Inventor 张付申邢明飞
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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