Integration method for electroplating acid pickle recycling and advanced waste treatment

An advanced treatment and integrated method technology, applied in the direction of water/sewage multi-stage treatment, adsorption water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problems of complex advanced treatment of electroplating wastewater components, achieve resource utilization, reduce Amount of pickling acid, effect of reducing salt content

Inactive Publication Date: 2010-06-09
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the current problem that the components of electroplating wastewater are complicated and difficult to be treated in depth, the purpose of the present invention is to provide an integrated method for the recycling of electroplating pickling solution and advanced treatment of wastewater, and realize the recycling of pickling wastewater and advanced treatment of electroplating wastewater through a combined process. It can be applied to the advanced treatment of various types of electroplating wastewater containing cationic pollutants such as heavy metals and anionic pollutants such as phosphate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Filter 500mL of waste hydrochloric acid pickling liquid from iron castings discharged from the copper-nickel plating workshop. The filtrate is a brownish-yellow transparent liquid with an HCl concentration of about 6mol / L and an iron ion content of about 23000mg / L. Add 8 mL of 25% H dropwise 2 o 2 Aqueous solution, stirred at 25°C for 2 hours; at 25±5°C, pass 500mL of oxidized waste hydrochloric pickling liquid through a glass column (Φ100× 360mm), the flow rate is 2BV / h, the treated effluent is a colorless to light yellow transparent liquid, the HCl concentration is about 6mol / L, and the iron ion concentration is about 2000mg / L. Industrial hydrochloric acid can be added in a ratio of 1:1-1:2 (volume ratio) to enrich the waste acid and return it to the production process for acid washing. The use of the method can reduce the salt (NaCl) content in the electroplating wastewater from about 6% to less than 1%.

[0019] After conventional process treatment, the salt cont...

Embodiment 2

[0021] Filter the 2L iron casting waste hydrochloric pickling solution discharged from the copper-nickel plating workshop. The filtrate is a brownish-yellow transparent liquid, the HCl concentration is about 7mol / L, and the iron ion content is about 28000mg / L. Add 30 mL of 28% H dropwise 2 o 2 Aqueous solution, stirred at 25°C for 2 hours; at 25±5°C, pass 2L of the oxidized waste hydrochloric acid washing liquid through a glass column (Φ200× 500mm), the flow rate is 2BV / h, the treated effluent is a colorless to light yellow transparent liquid, the HCl concentration is about 6.8mol / L, and the iron ion concentration is about 1800mg / L. Industrial hydrochloric acid can be added in a ratio of 1:1-1:2 (volume ratio) to enrich the waste acid and return it to the production process for acid washing. The use of the method can reduce the salt (NaCl) content in the electroplating wastewater from about 6% to less than 1%.

[0022] After conventional processing, the salt content in elec...

Embodiment 3

[0024] Filter 1L of waste hydrochloric pickling liquid from iron castings discharged from the copper plating workshop, the filtrate is a brownish-yellow transparent liquid, the HCl concentration is about 6.8mol / L, and the iron ion content is about 22000mg / L. Add 20 mL of 22% H dropwise 2 o 2 Aqueous solution, stirred at 25°C for 2 hours; at 20±5°C, pass 1L of the oxidized waste hydrochloric acid washing liquid through a glass column (Φ100× 350mm), the flow rate is 1.8BV / h, the treated effluent is a colorless to light yellow transparent liquid, the HCl concentration is about 6.6mol / L, and the iron ion concentration is about 2300mg / L. Industrial hydrochloric acid can be added in a ratio of 1:1-1:3 (volume ratio) to enrich the waste acid and return it to the production process for acid washing. The use of the method can reduce the salt (NaCl) content in the electroplating wastewater from about 7% to less than 1%.

[0025]After conventional processing, the salt content in elect...

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Abstract

The invention provides an integration method for electroplating acid pickle recycling and advanced waste treatment, which comprises the following steps: filtering the acid pickle of plating products in a plating process, then adding an oxidizer to ensure that bivalent iron ions in the acid pickle are completely converted into trivalent iron ions; then removing the trivalent iron ions in the acid pickle through an adsorption plant which is filled with anion exchange resins of which the surfaces are bound with quaternary ammonium cation bound, adding appropriate amount of industrial concentrated hydrochloric acid into the processed acid pickle of the plating products to increase the concentration to over 20 percent, then, returning the acid pickle to the production processes for recycling; and carrying out conventional fabrication processing on the processed electroplating wastewater, allowing the electroplating wastewater to pass through a combination filter bed, stopping adsorption when the adsorption reaches a leak point, and carrying out desorption and regeneration on a compound adsorbent by a desorption agent. The integration method realizes the resource utilization of the electroplating acid pickle, remarkably reduces the using amount of acid pickle in the electroplating process, realizes the advanced removal of the cationic contaminants such as heavy metal and the like and the anionic contaminants such as phosphate radical and the like which is difficult to realize in the conventional treatment process.

Description

technical field [0001] The invention relates to a method for comprehensive treatment and resource utilization of electroplating wastewater, specifically, an integrated method for realizing resource utilization of electroplating pickling solution and advanced treatment of electroplating wastewater through multiple process combinations. Background technique [0002] Electroplating is a process that uses chemical or electrochemical methods to decorate, protect and obtain certain new properties on the surface of metal or other material parts. During the electroplating process, a large amount of electroplating wastewater with complex components will be produced. When electroplating iron castings, it is often necessary to use concentrated hydrochloric acid for dipping and rinsing to remove surface rust. When the iron content in the concentrated hydrochloric acid washing solution reaches a certain level, it will lose the effect of removing rust and be discarded. At present, the wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/42C02F1/72C02F1/28
Inventor 潘丙才张炜铭潘丙军吕路杨磊谷辉宁林振伟张全兴陈金龙
Owner NANJING UNIV
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