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Method for treating copper-nickel alloy electroplating wastewater in pyrophosphate-citric acid system

A technology of pyrophosphate, copper-nickel alloy, applied in the fields of metallurgical wastewater treatment, water/sewage treatment, water treatment parameter control, etc., can solve the problems of unreachable copper and nickel, low efficiency of lemon root, high treatment cost, etc. To achieve the effect of simple process, low processing cost and good market application prospects

Active Publication Date: 2019-08-06
GUANGZHOU ULTRA UNION CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Pyrophosphate-citric acid system copper-nickel alloy electroplating wastewater contains trisodium citrate complexing agent, citrate root has strong oxidation resistance, and the efficiency of destroying lemon root by traditional oxidation method is low. Generally, it is necessary to add a large amount of oxidant to destroy the coordination of citric acid agent, the treatment cost is high, and it is difficult to effectively remove citrate in winter when the temperature is low
Therefore, if the copper-nickel alloy electroplating wastewater containing citric acid is treated by the traditional oxidation-hydroxide precipitation method, the content of copper and nickel after treatment often does not meet the requirements of GB21900-2008 "Electroplating Pollutant Discharge Standard"

Method used

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  • Method for treating copper-nickel alloy electroplating wastewater in pyrophosphate-citric acid system

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Experimental program
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Effect test

Embodiment 1

[0045] Embodiment 1: process the copper-nickel alloy electroplating wastewater containing potassium pyrophosphate 5000 mg / L

[0046] Step 1, add ferrous chloride and calcium chloride

[0047] The copper-nickel alloy electroplating wastewater is transported from the wastewater regulating tank to the feeding tank, the tank liquid is stirred with a mixer, and hydrochloric acid is added to adjust the pH to 6, and 15L of ferrous chloride solution and 35L of calcium chloride solution are added to each ton of wastewater.

[0048] Step 2. Precipitation of complexing agents and heavy metal ions

[0049] The wastewater in the feeding tank flows into the sedimentation tank, the tank liquid is stirred with a mixer, the pH is adjusted to 10-12 by adding lime emulsion, the ferrous ion and the calcium ion cooperate to precipitate citrate, and the calcium ion and pyrophosphate form calcium pyrophosphate precipitation, from the compound Copper ions and nickel ions released from the ions form ...

Embodiment 2

[0058] Embodiment 2: process the copper-nickel alloy electroplating wastewater containing potassium pyrophosphate 2000 mg / L

[0059] Step 1, add ferrous chloride and calcium chloride

[0060] The copper-nickel alloy electroplating wastewater is transported from the wastewater regulating tank to the feeding tank, the tank liquid is stirred with a mixer, the pH is adjusted to 6 by adding hydrochloric acid, and 8L of ferrous chloride solution and 15L of calcium chloride solution are added to each ton of wastewater.

[0061] Step 2. Precipitation of complexing agents and heavy metal ions

[0062] The wastewater in the feeding tank flows into the sedimentation tank, the tank liquid is stirred with a mixer, the pH is adjusted to 10-12 by adding lime emulsion, the ferrous ion and the calcium ion cooperate to precipitate citrate, and the calcium ion and pyrophosphate form calcium pyrophosphate precipitation, from the compound Copper ions and nickel ions released from the ions form pr...

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Abstract

The invention discloses a method for treating copper-nickel alloy electroplating wastewater in a pyrophosphate-citric acid system, and the method comprises the following steps: adding ferrous chlorideand calcium chloride into the wastewater, adjusting the pH value to 10-12 by lime emulsion, using ferrous ions and calcium ions for co-precipitating a citric acid complexing agent by, precipitating pyrophosphate by the calcium ions, precipitating to obtain copper phosphate and nickel phosphate by phosphate ions, and precipitating corresponding hydroxides and the like by copper ions and nickel ions, adding an oxidant to oxidize other organic matters, and adjusting the pH value of the wastewater to 6-9. The treatment results meet the requirements of GB 21900-2008 ''Discharge Standard of Electroplating Pollutants''. A new method for removing a carboxyl-containing organic acid complexing agent in the wastewater by use of the ferrous ions and the calcium ions for precipitation is established,and the new method has simple and easy process, low treatment cost and better market application prospect.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, in particular to a treatment method for pyrophosphate-citric acid system copper-nickel alloy electroplating wastewater. Background technique [0002] Pyrophosphate-citric acid system copper-nickel alloy electroplating wastewater contains trisodium citrate complexing agent, citrate root has strong oxidation resistance, and the efficiency of destroying lemon root by traditional oxidation method is low. Generally, it is necessary to add a large amount of oxidant to destroy the coordination of citric acid agent, the treatment cost is high, and it is difficult to effectively remove citrate in winter when the temperature is low. Therefore, if the copper-nickel alloy electroplating wastewater containing citric acid is treated by the traditional oxidation-hydroxide precipitation method, the content of copper and nickel after treatment often does not meet the requirements of GB2190...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/16C02F101/34C02F101/30C02F101/20C02F101/10
CPCC02F1/56C02F1/58C02F1/62C02F1/66C02F1/722C02F1/76C02F9/00C02F2101/105C02F2101/20C02F2101/30C02F2101/34C02F2103/16C02F2209/04
Inventor 郭崇武赖奂汶
Owner GUANGZHOU ULTRA UNION CHEM LTD
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