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

Method for extracting copper and preparing polymerization ferric chloride by replacement of acidic etching liquid of PCB (printed circuit board) factory

A technology of acid etching solution and polyferric chloride, which is applied in the direction of ferric halide, etc., can solve the problems of large loss of ion membrane and titanium sheet, high equipment operation cost, and large one-time investment of electrolysis device, so as to reduce environmental pollution , reduce waste of resources, and promote sustainable development

Inactive Publication Date: 2014-06-18
江西红板科技股份有限公司
View PDF6 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technology realizes the replacement of copper and the preparation of modified polyiron, it has the following disadvantages: a. The replacement reaction time is long; b. Chemical raw materials such as iron salts need to be added to adjust the total iron concentration of the final product, and the process operation is relatively complicated; c. The complex anions in the components of the product affect the use of polyferric chloride and the complexation stability of the solution. The use of catalyst aluminum nitrate may cause the total nitrogen of wastewater to exceed the standard; d, oxidation, hydrolysis, and polymerization at 1.0~4.0 atm and 110°C ~150°C range, process conditions require equipment, energy consumption and operation management, and the cost of process promotion is relatively high
However, the one-time investment of the electrolysis device is large, the maintenance cost of the equipment is also high, the loss of the ion membrane, titanium sheet, etc. is large, the operation cost of the equipment is high, the chlorine gas generated during the electrolysis process is difficult to control, and the secondary pollution is serious.

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 extracting copper and preparing polymerization ferric chloride by replacement of acidic etching liquid of PCB (printed circuit board) factory

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Pump 2000L hydrochloric acid / sodium chlorate system acidic etching solution from the etching solution collection tank, density 1.280g / cm 3 , containing copper 118g / L, [H + ] 1.7mol / L acidic etching waste liquid into the primary displacement reaction tank (1); fill 1000kg of iron filings and steel belt scraps on the supporting layer in the primary displacement reaction tank (1) for the displacement reaction; After the pump cycle is replaced for 1 hour, open the valve to make the upper liquid overflow to the intermediate liquid storage tank I (3);

[0041] (2) When the copper content in the etching solution is lower than 1.0 g / L, stop the first-stage replacement cycle, wash the replaced sponge copper powder to the copper powder collection tank (2), and pack it into bags after cleaning and draining;

[0042] (3) After the first-stage replacement reaction, collect the copper deposited in the intermediate liquid storage tank I (2) into the copper powder storage tank (3); th...

Embodiment 2

[0049] Pump 500L HCl / FeCl from the etchant collection tank 3 System acidic etchant, density 1.383g / cm 3 , containing 12.5% ​​iron, 58g / L copper, [H + ] 1.4mol / L acidic etching waste liquid into the primary displacement reaction tank (1); fill 500kg of iron filings and steel strip scraps on the support layer in the primary displacement reaction tank (1) for the displacement reaction; After 3 hours of pump cycle replacement, open the valve to allow the upper liquid to overflow to the middle liquid storage tank I (3);

[0050] (2) When the copper content in the etching solution is lower than 1.0 g / L, stop the first-stage replacement cycle, wash the replaced sponge copper powder to the copper powder collection tank (2), and pack it into bags after cleaning and draining;

[0051] (3) After the first-stage replacement reaction, collect the copper precipitated by the replacement in the intermediate liquid storage tank I (2) to the copper powder storage tank (3); the porous supporti...

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

PropertyMeasurementUnit
Densityaaaaaaaaaa
Densityaaaaaaaaaa
Densityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for extracting copper and preparing polymerization ferric chloride by replacement of acidic etching liquid of a PCB (printed circuit board) factory. The method comprises the following steps: by combination with an existing process for cooperatively preparing polymerization ferric chloride by replacement of acidic etching liquid, extracting copper by adopting primary waste iron replacement of, iron powder reduction or secondary aluminum sheet replacement, oxidizing waste liquid by sodium chlorate, and polymerizing to prepare a polymerization ferric chloride solution. According to the method, the equipment investment cost is low, the operation is easy, the copper recovery rate is high, prepared polymerization ferric chloride has the advantages of being stable, having a good water treatment effect and the like, the acidic etching liquid is provided and recycled, the zero discharge is really realized, and the promotion prospect is very wide.

Description

technical field [0001] The invention relates to a method for recovering and treating acid etching liquid in a PCB factory, in particular to a method for replacing and extracting copper with acid etching liquid in a PCB factory and preparing polyferric chloride, which belongs to the field of resource utilization of industrial waste and wastewater treatment. Background technique [0002] In recent years, with the steady growth of the world's demand for electronic products, my country's printed circuit board (PCB) manufacturing industry has also developed rapidly. At the same time, the country has paid more and more attention to environmental protection, and the discharge standards of industrial wastewater have become more stringent. For the PCB manufacturing industry that produces a large amount of toxic and harmful industrial wastewater and waste, it is necessary to implement efficient and reasonable governance. Recycling PCB acid etching solution can not only save resources...

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): C01G49/10
Inventor 查红平张昭君徐福林
Owner 江西红板科技股份有限公司