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Method for recovering and reutilizing copper etching agent containing amino-soda by metal aluminum

A metal aluminum and copper etching technology, applied in the direction of metallurgical wastewater treatment, chemical instruments and methods, process efficiency improvement, etc., can solve the problems of large heat release, difficult to control, and large copper changes, and achieve fast copper removal, Easy to control, good response control effect

Inactive Publication Date: 2007-06-20
DAREN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is very effective, the reaction is fast and the efficiency is high, but the amount of copper recovered per unit of aluminum varies greatly and is difficult to control because the reaction process is very exothermic (US Patent No. 5,524,780 A )

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] This is the original design used in the aforementioned patent, which is associated with copper recovery and ammoniacal etchant recovery in the present process.

[0027] In this test, a single tank was used as the reaction vessel. This is a polypropylene slanted bottom tank. The tank contained a fluorocarbon-coated stainless steel heater and a monofluorocarbon coil water cooler. Fourteen pieces of aluminum measuring approximately 24 x 24 x 0.32 cm and weighing 2874 grams were placed on the grid in the tank. The tank contained 66 liters of nearly pure ammoniacal etchant containing 0.1 g / L copper. The solution was heated to 70°C to bring it to an initial reaction temperature.

[0028] Spent ammoniated copper etchant containing 130 g / L copper at room temperature was slowly pumped into the tank at a rate of 2.4 L / min, increasing the copper concentration at a rate of 4.7 g / min. While monitoring the temperature, the rate of copper addition was controlled by turning the pum...

example 2

[0033] This is an example of an improved design. Unlike the previous examples, two types of tanks were used for increased control over the course of the reaction.

[0034] Two types of tanks are used in this example, one of which is a control tank. There is no metal aluminum in the control tank, it is only used to dilute the concentrated etchant and heat it to the working temperature. If necessary, it is allowed to adjust the corresponding process parameters, including temperature, copper concentration, pH value, specific gravity, ammonia water capacity, chlorine Compound content and circulation speed, etc. The second category is the reaction tank. Once the relevant process parameters are set in the control tank, the adjusted waste etchant is output from the control tank and enters the reaction tank to remove copper. The reaction tank contains aluminum metal to react with the copper ions dissolved in the spent etchant. Alternatively, the aluminum metal can be placed in a f...

example 3

[0038] This example is an example of an improved design proposed on the basis of Example 2, which is suitable for large-scale continuous copper removal. In this example, the reactor tanks are arranged in series for increased control and efficiency.

[0039] Same as the previous example, there is no metal aluminum in the control tank, it is only used to dilute the concentrated etchant and heat it to the working temperature, allowing adjustment of the corresponding process parameters, including temperature, copper concentration, pH value, specific gravity, if necessary , ammonia water capacity, chloride content and circulation speed, etc.

[0040] Once the relevant process parameters are set in the control tank, the adjusted waste etchant is output from the control tank and pumped to the first row of multiple parallel reaction tanks through the first manifold, for example, 5 in parallel reaction tanks. Each reaction tank in this row therefore has substantially the same amount ...

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PUM

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Abstract

Method for recovering and re-utilizing refused copper etching agent containing ammonia-soda from metal aluminum is carried out by controlling process parameter by control channel and removing copper by one or multiple independent reactive kettle with aluminum. The process parameter consists of temperature, copper concentration, pH value, specific weight, ammonia capacity, chloride content and circulating speed. The reactive kettles could be series, paralleled or mixed arranged and have independent filter with solid reactant selectively.

Description

technical field [0001] The present invention relates to a method for recovering and reusing waste ammoniacal alkaline copper etchant using metallic aluminum without substantially adding unwanted soluble by-products. Background technique [0002] The printed circuit board industry typically uses ammoniacal alkaline copper etchants to remove unwanted copper from printed circuit boards as part of the manufacturing process. Ammonia-based alkaline copper etchant is a mixture of copper ammonium chloride, ammonium chloride, ammonium hydroxide, ammonium carbonate, and small amounts of other substances. Copper ammonium chloride itself is active when copper is in the divalent (+2) copper state. Copper ammonium chloride corrodes and dissolves metallic copper to form ammonium chloride of monovalent (+1) copper. As a corrosive material, monovalent copper salts are inactive. The cupric salt is reoxidized by atmospheric oxygen to the active etchant or cupric form. [0003] This etchant...

Claims

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Application Information

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IPC IPC(8): C23F1/46
CPCC22B3/46C23F1/46C22B7/006C22B15/0078C02F2209/06C02F2209/01C22B15/0091C02F2209/40C02F2103/16C02F1/705C02F1/001C02F2209/02Y02P10/20
Inventor 吉罗德·A·克鲁力
Owner DAREN TECH
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