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Method for preparing nano lead oxide powder by using waste lead-containing soldering tins

A lead oxide and nanotechnology, applied in the field of solid waste recycling, can solve the problems of environmental pollution, insufficient technology, low added value of recycled products, etc., and achieve the effects of simple process, low cost and remarkable treatment effect.

Active Publication Date: 2017-04-26
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a simple and effective method for recovering lead-containing solder and preparing nano-lead oxide powder at the same time for the current situation that heavy metal pollution is common, the existing recycling soldering process is backward, the technology is insufficient, and the added value of recycled products is low. Using the vacuum oxygen control method, the waste lead-containing solder in electronic waste was used as raw material to prepare high-purity and high-dispersion flake and rod-shaped nano-lead oxide powder, which achieved high lead-tin content while avoiding heavy metal lead pollution. Value added recovery

Method used

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  • Method for preparing nano lead oxide powder by using waste lead-containing soldering tins

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Embodiment 1

[0029] A kind of method utilizing waste and old leaded solder to prepare nano lead oxide powder, comprises the following steps:

[0030] Weigh 20 g of waste lead-containing solder separated from waste circuit boards into a corundum crucible, and then put the crucible into the heating chamber of a tube-type vacuum furnace. A quartz plate is placed in the condensation chamber at a distance of 60cm from the heating chamber as the condensation base; the heating chamber and the condensation chamber are separated by an insulating pipe plug, and there is a hole in the middle of the pipe plug so that the air can carry the lead oxide vapor through; the closed system is powered by a mechanical pump Evacuate the system pressure to 1Pa, and then adjust the inlet valve to let air in so that the dynamic pressure in the vacuum furnace is maintained at 1000Pa. Heat the evaporation chamber to 1000°C at a heating rate of 10°C / min and maintain it for 60 minutes; adjust the temperature of the con...

Embodiment 2

[0032] A kind of method utilizing waste and old leaded solder to prepare nano lead oxide powder, comprises the following steps:

[0033]Weigh 20 g of waste lead-containing solder separated from waste circuit boards into a corundum crucible, and then put the crucible into the heating chamber of a tube-type vacuum furnace. Place a quartz plate at 60 cm in the condensation chamber as the condensation base. The middle of the heating chamber and the condensing chamber is separated by an insulating pipe plug, and there is a hole in the middle of the pipe plug so that the air carrying lead oxide vapor can pass through. After sealing the system, the mechanical pump pumps the system pressure to 1Pa, and then adjusts the inlet valve to let air in so that the dynamic pressure of 1000Pa is maintained in the vacuum furnace. Heat the evaporation chamber to 1000°C at a heating rate of 10°C / min and keep it for 100min. Adjust the temperature of the condensation chamber to 100°C and maintain ...

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Abstract

The invention discloses a method for preparing nano lead oxide powder by using waste lead-containing soldering tins. According to the method, the waste lead-containing soldering tins separated from waste circuit boards are put into a vacuum furnace, and air is introduced into the vacuum furnace to oxidize the waste soldering tins into lead oxide and tin dioxide by adopting a vacuum oxygen control method. Meanwhile, the vacuum furnace is heated to evaporate out the lead oxide according to different boiling points of the lead oxide and the tin dioxide, and then the lead oxide is carried into a condensation chamber by unreacted nitrogen and is condensed into nano powder. By controlling a system pressure, heating and condensing temperatures, and a condensation distance, two forms of nano lead oxide powder are prepared. Meanwhile, the residues in a crucible are tin dioxide powder. The nano lead oxide product prepared by the method disclosed by the invention has a broad application prospect in the fields of lead glass manufacturing, ceramic materials, pigment, light-emitting diodes, and lead acid storage batteries; and the prepared byproduct namely tin dioxide is a transparent conductive material is widely applied in the fields of electrode preparation, sensors, batteries, liquid crystal display and the like.

Description

technical field [0001] The invention belongs to the high-value recycling of electronic waste resources in the field of solid waste recycling, and relates to the high-value recycling of heavy metal lead and tin in electronic waste and the preparation of nanometer powder. In particular, it relates to a method for preparing sheet-like and rod-like nano-lead oxide powders by utilizing waste and old lead-containing solder. Background technique [0002] As the connection material between electronic components and circuit boards in electronic equipment, solder is widely used in home appliance manufacturing, electronics industry, automobile manufacturing, maintenance and daily life, and its consumption is huge. Lead-tin eutectic solder has advantages that cannot be replaced by other lead-free solders due to its low melting point, good tinning ability, and good diffusivity. However, the content of lead in lead-tin solder is very large, the content of lead in common eutectic solder r...

Claims

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Application Information

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IPC IPC(8): C01G21/06C01G21/10C01G19/02B82Y40/00
CPCB82Y40/00C01G19/02C01G21/06C01G21/10C01P2002/72C01P2004/03C01P2004/04C01P2004/16C01P2004/22C01P2006/80
Inventor 詹路向希蜀
Owner EAST CHINA NORMAL UNIV
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