Method for recovering copper from waste circuit board

A technology for waste circuit boards and ore pulp, applied in the field of hydrometallurgy, can solve the problems of complicated extraction process of metal copper, difficult to achieve large-scale application, increase of processing cost, etc. The effect of reducing recovery costs

Inactive Publication Date: 2015-07-01
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The leaching agent commonly used in wet copper leaching research is mineral acid, such as sulfuric acid, nitric acid, hydrochloric acid, etc., but the use of mineral acid leaching can easily cause other metals other than copper to be transferred to the liquid phase together with copper, making the subsequent copper extraction process difficult. Complicated, increased processing costs
The biotechnology method is still in the experimental research stage, and the corresponding leaching takes a long time, the leaching rate is low, and it is difficult to achieve large-scale application

Method used

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  • Method for recovering copper from waste circuit board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take 10 grams of a copper-clad circuit board with a copper content of 20.38%, and mechanically crush it to below 200 mesh; at a solid-to-liquid ratio of 1:3, a stirrer speed of 200r / min, a reaction temperature of 25°C, and an air volume of 12m 3 / h, ammonium chloride concentration 1mol / L, ammonia water 1 mol / L, turn on the ultrasonic wave, power 60W, add 1L / t hydrogen peroxide every 20min, ultrasonic enhanced oxidation leaching for 1 hour, the leaching of metal copper in waste copper circuit boards The rate is 98.19%.

Embodiment 2

[0033] Take 10 grams of a copper-clad circuit board with a copper content of 20.98%, and mechanically crush it to below 200 mesh; at a solid-liquid ratio of 1:8, a stirrer speed of 800r / min, and a reaction temperature of 25°C, the amount of air introduced is 12m 3 / h, ammonium chloride concentration 5mol / L, ammonia water 4 mol / L, turn on the ultrasonic wave, power 120W, add 3L / t hydrogen peroxide every 20min, ultrasonic enhanced oxidation leaching for 4 hours; leaching of metal copper in waste copper circuit boards The rate is 99.53%.

Embodiment 3

[0035] Take 10 grams of a copper-clad circuit board with a copper content of 19.58%, and mechanically crush it to below 200 mesh; at a solid-liquid ratio of 1:5, a stirrer speed of 600r / min, a reaction temperature of 25°C, and an air volume of 10m 3 / h, ammonium chloride concentration 3mol / L, ammonia water 2 mol / L, turn on the ultrasonic wave, power 180 W, add 2L / t hydrogen peroxide every 20min, ultrasonic enhanced oxidation leaching for 2 hours; The leaching rate is 98.62%.

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Abstract

The invention discloses a method for recovering copper from a waste circuit board and belongs to the technical field of hydrometallurgy. The method comprises the following steps: firstly crushing the waste circuit board into powder, fully mixing the powder, an ammonia water solution, an ammonium chloride solution and water to obtain ore pulp, introducing air into the ore pulp, and carrying out ultrasonic wave intensified leaching under a stirring condition; and periodically adding hydrogen peroxide in the intensified leaching process so as to leach copper from the waste circuit board, wherein the leaching rate of copper from the waste circuit board leached in 1 hour reaches over 98%. The method disclosed by the invention realizes resource utilization of effective components of the waste circuit board and moreover, the method has the advantages of being environment-friendly, mild in reaction and short in technological process, the production cost can be lowered and the metal copper recovery rate is high, and the method is suitable for recovering valuable metals in the waste circuit board.

Description

technical field [0001] The invention relates to a method for recovering copper in waste circuit boards, belonging to the technical field of hydrometallurgy. Background technique [0002] With the development and progress of human civilization and science and technology, the consumption of mineral resources is increasing day by day. However, due to the increasing depletion of high-grade mineral resources, there will be a shortage of resources in the metal production process, which requires people to extract metals from various ores and industrial waste. [0003] In today's world, the electronics and electrical appliances industry is developing rapidly, with endless technological innovations and continuously growing markets [0004] Demand has increased the production of electronic and electrical equipment, and also accelerated the replacement of electronic and electrical equipment. [0005] generation, resulting in a large amount of waste electronic and electrical equ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B15/00
CPCY02P10/20
Inventor 王仕兴崔维彭金辉张利波甯利平张耕玮
Owner KUNMING UNIV OF SCI & TECH
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