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Resource utilization method suitable for PCB deplating waste liquor

A technology for stripping waste liquid and recycling it, applied in the directions of nitrogen oxides/oxyacids, copper sulfate, nitric acid, etc., which can solve the anti-corrosion requirements of nitrogen oxide overflow equipment in the evaporation process, the high requirements for equipment anti-corrosion, and the cost of electrolysis equipment. Expensive and other issues, to achieve the effect of facilitating sales, increasing product added value, and high utilization of resources

Active Publication Date: 2019-04-16
深圳星河环境股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the presence of nitric acid in the system, nitrogen oxides will be produced in the electrolysis process, and the anti-corrosion requirements for equipment are high, and the cost of electrolysis equipment is expensive
There are also studies on the preliminary recovery of nitric acid in the copper nitrate system through diffusion dialysis or vacuum distillation, but the research and development focus is on the copper recovery at the end, and the evaporation process also has the overflow problem of nitrogen oxides and equipment problems. Anti-corrosion requirements

Method used

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  • Resource utilization method suitable for PCB deplating waste liquor
  • Resource utilization method suitable for PCB deplating waste liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Take 1000ml nitric acid waste liquid, analyze copper ion and acid content, slowly add concentrated sulfuric acid equal molar to copper ion, after cooling, analyze acid content to be 5.59mol / L.

[0037] 2. Take 1000ml of the above-prepared solution, and prepare 1000ml of TBP extractant at the same time, pour the two solutions from the upper mouth of the separating funnel, and cover the lid; shake the separating funnel to make the two phases fully contact; after shaking, spin Turn the knob to release the gas in the separatory funnel; continue to oscillate to deflate several times, and the total time of oscillating is 5 minutes.

[0038]3. Put the separatory funnel on the iron ring and wait for the liquid to separate into two clear phases; after the phase separation is complete, the lower liquid is released through the bottom opening, and the upper liquid is released from the upper port.

[0039] 4. The separated upper liquid is extracted multiple times according to the...

Embodiment 2

[0043] 1. Take 1000ml of nitric acid waste liquid, analyze the copper ion and acid content, slowly add concentrated sulfuric acid with twice the molar concentration of copper ion, and analyze the acid content to be 6.6mol / L after cooling.

[0044] 2. Take 1000ml of the above prepared solution. At the same time, prepare 1000ml of TBP extractant, pour the two solutions from the upper mouth of the separatory funnel, and cover the lid; shake the separatory funnel to make the two phases fully contact; after shaking, turn the knob to release the gas in the separatory funnel ;Continue to oscillate and deflate several times, the total time of oscillating is 5min.

[0045] 3. Put the separatory funnel on the iron ring and wait for the liquid to separate into two clear phases; after the phase separation is complete, the lower liquid is released through the bottom opening, and the upper liquid is released from the upper port.

[0046] 4. The separated upper liquid is extracted multiple ...

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Abstract

The invention discloses a resource utilization method suitable for PCB deplating waste liquor. The deplating waste liquor is copper nitrate waste liquor. The method comprises the following steps of pretreatment, wherein the copper nitrate waste liquor is filtered to remove impurities, a sulfuric acid solution is added into the filtered copper nitrate waste liquor, and the acid concentration of thesystem is adjusted to obtain an inorganic phase for use; extraction, wherein the inorganic phase is put into an extraction device, an extraction agent TBP is added, and the extraction condition is controlled for extracting nitric acid to obtain an extract phase and a raffinate phase; back extraction, wherein the extract phase is put into the extraction device, water is added, and the back extraction condition is controlled for back-extracting nitric acid to obtain a nitric acid solution; crystallization, wherein a copper oxide or copper hydroxide solid is added into the raffinate phase to neutralize redundant acid, the pH of the system is adjusted to 2-3, filtering is conducted, a filtrate is crystallized, and then a copper sulfate crystal is obtained. According to the resource utilization method, copper and waste liquor are recycled under normal temperature and normal pressure, the energy consumption is lowered, the waste of resources is avoided, the environmental pollution is prevented, and the production cost is lowered.

Description

technical field [0001] The invention relates to the technical field of deplating waste liquid treatment, in particular to a resource utilization method suitable for PCB deplating waste liquid. Background technique [0002] Electroplating is an important production process in the printed circuit board (PCB) industry and the electroplating industry. Deplating waste liquid is mainly copper nitrate waste liquid. For copper nitrate waste liquid, the existing production process mainly focuses on the resource utilization of copper, and only low-grade copper sludge or copper products are obtained, such as acid-base neutralization Both the method and the replacement method do not consider the resource utilization of nitric acid, which not only wastes resources, but also increases costs. According to the difference in solubility product, some studies use the form of copper oxalate and copper acetate to recycle copper ions. By reducing the form of copper ions in the system, the scrap ...

Claims

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Application Information

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IPC IPC(8): C01B21/42C01G3/10
CPCC01B21/42C01G3/10
Inventor 邹毅芳宋传京陆严宏叶自洁田浩杨林城国吴玉章
Owner 深圳星河环境股份有限公司
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