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

Method for recovering cuprous chloride from alkaline waste etching solution

A technology for etching waste liquid and cuprous chloride, applied in the direction of cupric chloride, cupric halide, etc., to achieve the effect of protecting the environment, saving comprehensive utilization, and saving resources

Inactive Publication Date: 2013-08-21
WENZHOU UNIVERSITY
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods have their own advantages and disadvantages, and the treatment of alkaline etching waste liquid should be developed in the direction of resource recycling and turning waste into treasure

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 recovering cuprous chloride from alkaline waste etching solution
  • Method for recovering cuprous chloride from alkaline waste etching solution
  • Method for recovering cuprous chloride from alkaline waste etching solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 1 liter of waste liquid, add dilute hydrochloric acid dropwise while stirring until the pH=7 of the waste liquid, and filter the waste liquid. At this time, the precipitate contains monovalent copper ammonium ions, and the filtrate can be reused to prepare a new etching solution. The precipitate was heated at 100° C. until no gas was generated to obtain a gray-green precipitate weighing 98 g, which was verified as cuprous chloride by X-ray powder diffraction. The recovered ammonia water can be used to configure new etching solution.

Embodiment 2

[0027] Take 1 liter of waste liquid, add dilute hydrochloric acid dropwise while stirring until the pH of the waste liquid=7.5, and filter the waste liquid. At this time, the precipitate contains monovalent copper ammonium ions, and the filtrate can be reused to prepare a new etching solution. The precipitate was heated at 110° C. until no gas was generated to obtain a gray-green precipitate weighing 85 g, which was verified as cuprous chloride by X-ray powder diffraction. The recovered ammonia water can be used to configure new etching solution.

Embodiment 3

[0029] Take 1 liter of waste liquid, add dilute hydrochloric acid dropwise while stirring until the pH=6 of the waste liquid, and filter the waste liquid. At this time, the precipitate contains monovalent copper ammonium ions, and the filtrate can be reused to prepare a new etching solution. The precipitate was heated at 120° C. until no gas was generated to obtain a gray-green precipitate weighing 89 g, which was verified as cuprous chloride by X-ray powder diffraction. The recovered ammonia water can be used to configure new etching solution.

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 recovering cuprous chloride from an alkaline waste etching solution. The method comprises the steps of placing the waste etching solution in a sealed reactor, slowly dropping a diluted hydrochloric acid solution with mass percentage lower than 37% at normal temperature and stirring simultaneously, stopping dropping when the waste solution is converted to be neutral and slightly acidic from being alkaline, standing by for a moment and cooling to room temperature, so that the solution is layered, wherein the upper layer is a solution layer and the lower layer is a precipitate; filtering and drying the precipitate on the lower layer, wherein filtrate which is separated simultaneously is a clear solution; and heating the separated precipitate in a sealed container with ammonia gas absorption equipment at about 100 DEG C for 2-3 hours to obtain grey-green powder which is cuprous chloride. The method has the advantages of being simple and stable in process, convenient to operate, low in cost, and free from new pollutant in the treatment process; and the residual waste solution treated by the method, which can be reused for preparing an alkaline etching solution, can be returned to a production line for continuous use.

Description

technical field [0001] The invention belongs to a method for recovering cuprous chloride from alkaline etching waste liquid. Background technique [0002] Alkaline etching solution is a chemical used in large quantities in the production process of printed circuit boards (PCB). 4 C1, NH 3 Etching waste liquid of other substances. Since the waste water produced by circuit board manufacturers contains a large amount of metal copper with recycling value, and the excess is serious (such as copper ions in the etching waste liquid exceed the standard by 140,000-160,000 times), these waste liquids and waste water containing a large amount of metal copper If it is discharged arbitrarily without treatment, it will not only waste a lot of resources (1m 3 Copper corrosion waste liquid loses about 100 kilograms of copper), which increases the cost and difficulty of subsequent sewage treatment, and also causes corrosion of underground pipelines, and more seriously, serious pollution o...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C01G3/05
Inventor 李新华赵华毅肖洪平
Owner WENZHOU UNIVERSITY