Method for preparing basic bluestone by utilizing PCB ammonium persulfate-H2SO4 micro-etched waste liquid

A technology of -H2SO4 and ammonium persulfate, which is applied in the field of production of basic copper sulfate, can solve the problems of reducing the ornamental value of water bodies, large energy loss, and large power consumption, and achieve the effects of reducing burden, realizing recycling, and reducing harm

Active Publication Date: 2010-07-21
GUANGZHOU KECHENG ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Ammonium persulfate-H in circuit board factory 2 SO 4 Microetching waste liquid contains Cu 2+ , NH 4 + and H 2 SO 4 , usually discharged to wastewater plants after physical and chemical treatment, and a large amount of copper enters the sludge. Although sludge incineration will convert copper into renewable resources, this method has low recovery efficiency and large energy consumption
In addition, there is a large amount of NH in the wastewater 4 + Ions, discharged into the water body will lead to eutrophication o

Method used

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  • Method for preparing basic bluestone by utilizing PCB ammonium persulfate-H2SO4 micro-etched waste liquid
  • Method for preparing basic bluestone by utilizing PCB ammonium persulfate-H2SO4 micro-etched waste liquid

Examples

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Effect test

Embodiment 1

[0027] at 8M 3 Add ammonium persulfate-H with a copper content of 25g / L to the enamel reaction kettle 2 SO 4 Micro-etching waste liquid 6M 3 , stirring while passing steam to make ammonium persulfate-H 2 SO 4 Microetching waste liquid was preheated to 75°C. In addition, a 30% (mass fraction) sodium hydroxide solution was preheated to 70° C. in a raw material storage tank. Start the reactor stirring paddle, open the raw material pump of sodium hydroxide and adjust the flow rate of the flowmeter at the same time, so that the sodium hydroxide solution is added in the reactor at a rate of 20L / Min, and the pH value of the reactant in the control reactor is 9.5; filter Add 1000g of sodium dodecylbenzenesulfonate to the precipitate, transfer it to the ammonia distillation reactor, and carry out reflux ammonia distillation under stirring conditions, control the ammonia distillation temperature at 70°C until the pH value drops to 7.5, stop ammonia distillation, and filter It was ...

Embodiment 2

[0029] at 8M 3 Add ammonium persulfate-H with a copper content of 50g / L to the enamel reaction kettle 2 SO 4 Micro-etching waste liquid 6M 3 , stirring while passing steam to make ammonium persulfate-H 2 SO 4 Microetching waste liquid was preheated to 75°C. In addition, a 30% (mass fraction) sodium hydroxide solution was preheated to 70° C. in a raw material storage tank. Start the reactor stirring paddle, open the raw material pump of sodium hydroxide and adjust the flow rate of the flowmeter at the same time, so that the sodium hydroxide solution is added in the reactor at a rate of 20L / Min, and the pH value of the reactant in the control reactor is 9.5; filter Add 1000g of sodium dodecylbenzenesulfonate to the precipitate, transfer it to the ammonia distillation reactor, and carry out reflux ammonia distillation under stirring conditions, control the ammonia distillation temperature at 70°C until the pH value drops to 8, stop ammonia distillation, and filter It was wa...

Embodiment 3

[0031] at 8M 3 Add ammonium persulfate-H with a copper content of 35g / L to the enamel reaction kettle 2 SO 4 Micro-etching waste liquid 6M 3 , stirring while passing steam to make ammonium persulfate-H 2 SO 4 Microetching waste liquid was preheated to 50°C. In addition, a 30% (mass fraction) sodium hydroxide solution was preheated to 50° C. in a raw material storage tank. Start the reactor stirring paddle, open the raw material pump of sodium hydroxide and adjust the flow rate of the flow meter at the same time, so that the sodium hydroxide solution is added in the reactor at a rate of 20L / Min, and the pH value of the reactant in the control reactor is 10; filter Add 2500g of sodium lignosulfonate to the precipitate, transfer it to the ammonia distillation reactor, and carry out reflux ammonia distillation under stirring conditions, control the temperature of ammonia distillation at 75°C until the pH value drops to 7.5, finish ammonia distillation, filter and wash with wa...

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Abstract

The invention discloses a method for preparing basic bluestone by utilizing PCB ammonium persulfate-H2SO4 micro-etched waste liquid. The method comprises the following steps of: (1) preheating ammonium persulfate-H2SO4 micro-etched waste liquid and basic solution to the temperature of between 50 and 100 DEG C respectively, and adding the preheated micro-etched waste liquid into a neutralizing reaction kettle with a stirring device; (2) gradually adding the basic solution into the micro-etched waste liquid with the stirring for neutralization reaction, and controlling the pH value in the neutralizing reaction kettle to be between 8.0 and 13.0; (3) after filtering precipitate, adding dispersant into filtrate; (4) transferring the filtrate of which the pH value is regulated to an ammonia evaporation reaction kettle for atmospheric distillation to ensure that ammonia escapes from the reaction kettle till the pH value is reduced to be between 7.5 and 8.5, and completing ammonia evaporation; and (5) filtering, washing, drying and sifting basic bluestone precipitate in the material to obtain a crystal-type basic bluestone product. The method has the advantages of efficiently recycling copper resource and contributing to generating high-purity basic bluestone, along with simple whole process equipment, easily controlled operating conditions, and less equipment investment.

Description

Technical field: [0001] The present invention relates to a kind of using PCB ammonium persulfate-H 2 SO 4 The invention relates to a method for producing basic copper sulfate from micro-etching waste liquid, which belongs to the fine chemical industry field. Background technique: [0002] In the production of printed circuit boards, microetching is required in the pretreatment of many processes, such as porosity (PTH), pattern plating (PP), hot air leveling (HASL) and before coating organic solderability protectant (OSP). Both need to use microetching solution to remove the oxide layer on the copper surface and the microcosmic roughening formed to enhance the bonding force of the subsequent process. At present, there are two general microetching solutions: one is persulfate-H 2 SO 4 system, the other is H 2 o 2 -H 2 SO 4 system. The first system often uses ammonium persulfate-H 2 SO 4 solution. [0003] Ammonium persulfate-H in circuit board factory 2 SO 4 Micro...

Claims

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Application Information

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IPC IPC(8): C01G3/10C02F9/04
Inventor 王永成陈伟华方健才张素娟
Owner GUANGZHOU KECHENG ENVIRONMENTAL PROTECTION TECH
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