Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for recycling copper from alkaline etching waste liquid

A technology of etching waste liquid and recovery method, which is applied in the direction of chemical instruments and methods, improvement of process efficiency, photography process, etc., can solve the problems of large consumption of reagents, product purity cannot be guaranteed, etc., to save costs, save resources, and facilitate Achieved effect

Inactive Publication Date: 2015-03-18
龚伶
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above three methods all adopt the precipitation method to separate copper, which needs to consume a large amount of reagents, which will not only generate a large amount of washing wastewater, but also the purity of the product cannot be guaranteed

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for recycling copper from alkaline etching waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Such as figure 1 As shown, the recovery method of copper in the alkaline etching waste liquid comprises the following steps: using an extractant to extract the alkaline etching waste liquid to obtain an extractant containing copper ions; adding the obtained copper ion-containing extractant to a sulfuric acid solution to obtain copper sulfate solution; the obtained copper sulfate solution is electrolyzed to obtain elemental copper. The specific process of using the extractant to extract the alkaline etching waste liquid to obtain the extractant containing copper ions is: add the alkaline etching waste liquid into the first stirring tank, then add the extracting agent into the first stirring tank and stir evenly, after stirring The solution in the first stirring tank is left to stand for a period of time to automatically stratify the solution in the tank, wherein, after stratification, the upper layer solution is an extractant containing copper ions, and the lower layer s...

Embodiment 2

[0021] The main difference between this embodiment and embodiment one is: the amount of alkaline etching waste liquid added in the first stirring tank in this embodiment is 300ml, and the concentration of copper ions in this alkaline etching waste liquid is 200g / L, because The concentration of copper ions in the alkaline etching waste liquid is relatively high. Add 450ml of Lix54-100 extractant with a mass percentage concentration of 40%. The extractant containing copper ions in the first stirred tank is taken out and added to the second stirred tank. The extraction agent containing copper ions and the sulfuric acid solution with a concentration of 35% by mass in the second stirring tank are added in a volume ratio of 1:4.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for recycling copper from an alkaline etching waste liquid. The method comprises the following steps: adding the alkaline etching waste liquid into a first stirring tank, adding an extracting agent into the first stirring tank, standing a liquid in the first stirring tank for a period of time to automatically layer the liquid in the first stirring tank, wherein an upper-layer liquid is an extracting agent containing copper ions and a lower-layer liquid is an alkaline etching recycling liquid; adding the extracting agent containing copper ions in the upper layer in the first stirring tank into a second stirring tank, adding a sulfuric acid liquid into the second stirring tank to carry out back extraction, standing the liquid in the second stirring tank for a period of time to automatically layer the liquid in the second stirring tank, wherein an upper-layer liquid is an extracting agent containing few copper ions and a lower-layer liquid is a copper sulfate liquid; and adding the lower-layer liquid in the second stirring tank into an electrolytic cell for direct current electrolysis to obtain elemental copper. The method for recycling copper from the alkaline etching waste liquid is simple to operate and convenient to implement; the recycled copper is high in purity; and the washing waste liquid is not produced.

Description

technical field [0001] The invention relates to the technical field of recovery and utilization of printed circuit board waste liquid, in particular to a method for recovering copper in alkaline etching waste liquid. Background technique [0002] Printed circuit board (PCB board) is a basic component of electronic products. It mainly provides mechanical support for fixing and assembling various electronic components such as integrated circuits in electronic equipment, and realizes wiring between various electronic components such as integrated circuits. And functions such as electrical connection or electrical insulation. With the rapid development of modern information industry and electronics industry, the PCB board industry is developing rapidly. The PCB board needs a large amount of etching solution in the production process. During the alkaline etching process of the circuit board, the copper concentration of alkaline etching can be adjusted according to the situati...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C23F1/46C22B7/00C22B3/26C25C1/12C02F1/26C02F1/62C22B15/00
CPCY02P10/20
Inventor 龚伶
Owner 龚伶