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Acid etching wastewater treatment and recycling system

An acid etching waste liquid, etching technology, applied in photography process, instrument, photography auxiliary process and other directions, can solve the problems of decreased ammonia nitrogen content, low etching rate, crystallization and so on

Active Publication Date: 2018-11-27
深圳市祺鑫环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the existing methods are to reuse the anolyte. However, the chlorine gas generated by the anode during the electrolysis process is often partially dissolved in water to form hypochlorous acid. The hypochlorous acid will oxidize the ammonium ions in the etching waste liquid. It is nitrogen, so that the ammonia nitrogen content in the solution decreases. When the anolyte is used as reuse, ammonium chloride often needs to be compensated, and ammonium chloride will crystallize due to its solubility saturation, so that the chlorine in the regenerated etching solution The concentration of ammonium chloride cannot reach the concentration of ammonium chloride in the newly prepared etching solution, so that when the regenerated etching solution is reused in the etching process, its etching rate is low

Method used

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  • Acid etching wastewater treatment and recycling system

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Effect test

Embodiment 1

[0045] The concentration of copper ions in the acidic etching waste liquid of a circuit board factory is 100g / L, the concentration of ammonia nitrogen is 12000ppm, the acid equivalent is 0.7N, the concentration of chloride ions is 211g / L, and the etching rate of the etching machine cylinder after the cylinder is newly opened is 48um / min; Then use 50L waste liquid, add 12000ppm copper-free sub-liquid to dilute, and then conduct electrolysis. The current is in the range of 10-20A and electrolyzes in four steps for 16 hours. At this time, the copper ion concentration of the catholyte is less than 1g / L, and ammonia nitrogen is 10800ppm, acid equivalent 1.5N, chloride ion concentration 186g / L, take 20L catholyte, add 100g ammonium chloride, 10mL etching additive to make regenerated sub-liquid, test in small etching machine tank, when regenerated sub-liquid replaces etching machine In the process of 50% of the etching solution in the tank, the etching rate fluctuates in the range of...

Embodiment 2

[0047] The concentration of copper ions in the acidic etching waste liquid of a circuit board factory in Jiangxi is 110g / L, the concentration of ammonia nitrogen is 6000ppm, the acid equivalent is 1.0N, and the concentration of chloride ions is 200g / L, measured after the etching machine cylinder is newly opened The etching rate is 36um / min; then use 20L waste liquid, dilute it with 6000ppm copper-free sub-solution, and then conduct electrolysis. The current is in the range of 10-20A and electrolyzes in four steps for 16h. At this time, the copper ion concentration of the catholyte is less than 1g / L. The concentration of ammonia nitrogen is 5400ppm, the acid equivalent is 1.9N, and the concentration of chloride ions is 177g / L. Take 20L of catholyte, add 45g of ammonium chloride, and 10mL of etching additives to make a regeneration daughter liquid. Test it in a small etching machine tank. When regeneration In the process of replacing 50% of the etching solution in the etching mac...

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Abstract

The invention discloses an acid etching wastewater treatment and recycling system, comprising: an etching station, wherein the etching station is provided with an etching machine cylinder and a wastewater transfer cylinder, and the wastewater transfer cylinder is communicated with the etching machine cylinder; an electrolytic station provided with an electrolytic device that includes an anodic chamber and a cathodic chamber divided by a diaphragm, wherein both the cathodic chamber and the anodic chamber are communicated with the wastewater transfer cylinder; a regeneration station provided with a regenerated liquid collection device and a regenerated sub-liquid blending cylinder communicated with each other, wherein the regenerated liquid collection device is communicated with the anodic chamber, and the regenerated sub-liquid blending cylinder is communicated with the etching machine cylinder. The acid etching wastewater treatment and recycling system can impart higher etching rate inan etching procedure to an etching liquid from regenerated and recycled acid etching wastewater.

Description

technical field [0001] The invention relates to the technical field of etching liquid treatment for printed circuit boards, in particular to a treatment and recycling system for acidic etching waste liquid. Background technique [0002] In the manufacturing process of printed circuit board (PCB), it is necessary to use etching solution to remove copper other than lines on the PCB. This process will produce etching waste solution. The etching solution mainly includes acid etching solution and alkaline etching solution, wherein, Acidic etching solution is widely used because of its characteristics of small side erosion, easy control of rate and easy regeneration. At present, the etching waste liquid generated in the etching process is usually regenerated and reused in the etching process, so as to realize the rational utilization of resource recycling. Most of the existing methods are to reuse the anolyte. However, the chlorine gas generated by the anode during the electrolys...

Claims

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Application Information

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IPC IPC(8): C23F1/46C25C1/12
CPCC23F1/46C25C1/12Y02P10/20
Inventor 黄文涛李再强尹雄威张伟奇梁民
Owner 深圳市祺鑫环保科技有限公司
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