Method for preparing high-purity copper oxide superfine powder from waste printed circuit boards

A technology of waste printed circuit and printed circuit board, which is applied in the field of electronic waste recycling, can solve the problems of strong acid corrosion equipment, harmful gas secondary pollution, etc., and achieve the effect of small average particle size and narrow particle size distribution range

Inactive Publication Date: 2011-04-13
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process can achieve the purpose of resource utilization of electronic waste, but because the strong acid used can dissolve almost all metals, other impurities will be introduced into the prepared copper oxide powder; at the same time, strong acid will also seriously corrode equipment and react with metals Produce harmful gas and cause secondary pollution

Method used

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  • Method for preparing high-purity copper oxide superfine powder from waste printed circuit boards
  • Method for preparing high-purity copper oxide superfine powder from waste printed circuit boards
  • Method for preparing high-purity copper oxide superfine powder from waste printed circuit boards

Examples

Experimental program
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Effect test

Embodiment 1

[0021] 1) Preparation of crushed waste printed circuit boards: manually crush waste printed circuit boards into fragments smaller than 10cm×10cm, and then crush them with a strong plastic crusher and a sealed sample preparation grinder to obtain crushed waste printed circuit boards material, the particle size of the waste printed circuit board pulverized material is 10 mesh;

[0022] 2) Preparation of copper-containing leaching solution: take 10 g of the waste printed circuit board pulverized material obtained in step 1) and immerse in ammonia water, add hydrogen peroxide dropwise to the leaching solution at room temperature and under stirring with an electromagnetic stirrer, control the reaction time to 10 hours, wait After the reaction is over, take out the waste material and carry out solid-liquid separation, and the obtained filtrate is the copper-containing leaching solution, wherein the mass ratio of the waste printed circuit board pulverized material, hydrogen peroxide a...

Embodiment 2

[0026] 1) Preparation of crushed waste printed circuit boards: manually crush waste printed circuit boards into fragments smaller than 10cm×10cm, and then crush them with a strong plastic crusher and a sealed sample preparation grinder to obtain crushed waste printed circuit boards Material, the particle diameter of described scrap printed circuit board pulverized material is 30 orders;

[0027] 2) Preparation of copper-containing leaching solution: take 10 g of the waste printed circuit board pulverized material obtained in step 1) and immerse in ammonia water, add hydrogen peroxide dropwise to the leaching solution at room temperature and under stirring with an electromagnetic stirrer, control the reaction time to 8 hours, wait After the reaction finishes, take out the waste material, carry out solid-liquid separation, and the obtained filtrate is the copper-containing leaching solution, wherein the mass ratio of waste printed circuit board pulverized material, hydrogen perox...

Embodiment 3

[0031] 1) Preparation of crushed waste printed circuit boards: manually crush waste printed circuit boards into fragments smaller than 10cm×10cm, and then crush them with a strong plastic crusher and a sealed sample preparation grinder to obtain crushed waste printed circuit boards material, the particle size of the waste printed circuit board pulverized material is 60 mesh;

[0032] 2) Preparation of copper-containing leaching solution: take 10 g of the waste printed circuit board pulverized material obtained in step 1) and immerse in ammonia water, add hydrogen peroxide dropwise to the leaching solution at room temperature and under the condition of stirring with an electromagnetic stirrer, control the reaction time to 9 hours, wait After the reaction is over, take out the waste material and carry out solid-liquid separation, and the obtained filtrate is the copper-containing leaching solution, wherein the mass ratio of waste printed circuit board pulverized material, hydroge...

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Abstract

The invention belongs to the technical field of electronic waste recycling, and relates to a method for preparing high-purity copper oxide superfine powder from waste printed circuit boards. The method is mainly characterized in that: mechanical pretreatment-wet-process metallurgy-spray drying joint treatment technology is adopted, and comprises the following main steps of: performing mechanical crushing treatment on the waste printed circuit boards, selectively leaching metal copper from the waste printed circuit board crushed material by using ammonia water and hydrogen peroxide, and filtering to obtain copper-containing leachate; putting the copper-containing leachate into a reaction container of a spray drier, and preparing precursor powder by adopting a spray drying method; and calcining the precursor powder into a muffle furnace to obtain the high-purity copper oxide superfine powder. In the method, the ammonia water is adopted to replace strong acid or strong base solution to selectively leach the metal copper from the waste printed circuit board crushed material, so that the high purity of the copper oxide superfine powder is ensured; and the method is simple in process without pollution; and the aim of recycling electronic wastes can be fulfilled.

Description

technical field [0001] The invention belongs to the technical field of recycling electronic waste, in particular to a method for preparing high-purity copper oxide superfine powder from waste printed circuit boards. Background technique [0002] As a versatile functional inorganic material, copper oxide ultrafine powder has unique electrical, magnetic, and catalytic properties, and is widely used in important fields such as catalysts, sensors, and electrode active materials. Waste printed circuit boards are rich in a large number of chemical elements, such as copper, silver, gold, mercury and other metals. If they are not properly treated, they will cause great harm to human health and the safety of the living environment. At the same time, waste printed circuit boards contain a lot of metals, especially copper. Therefore, developing a cost-effective and environmentally friendly recycling process to prepare copper oxide from waste printed circuit boards can create economic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/14C22B15/00C01G3/02
CPCY02P10/20
Inventor 章启军吴玉锋王维张永志程会强左铁镛
Owner BEIJING UNIV OF TECH
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