Treatment method of gun black tin-nickel alloy electroplating wastewater

A tin-nickel alloy and electroplating wastewater technology, which is applied in metallurgical wastewater treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve problems such as difficult to effectively remove citric acid, high treatment cost, and low efficiency of lemon root , to achieve good market application prospects, low processing costs, and reduce COD

Active Publication Date: 2021-12-17
GUANGZHOU ULTRA UNION CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Gun black tin-nickel alloy electroplating wastewater contains ammonium citrate complexing agent, citrate root has strong oxidation resistance, and the efficiency of destroying lemon root by traditional oxidation method is low. Generally, a large amount of oxidant is needed to destroy citric acid and other complexing agents, and the treatment cost is high. , it is difficult to effectively remove citric acid in winter when the temperature is low
Therefore, if the traditional oxidation-hydroxide precipitation method is used to treat gun black tin-nickel alloy electroplating wastewater containing citric acid, the content of nickel in the treated wastewater often does not meet the requirements of GB 21900-2008 "Electroplating Pollutant Discharge Standard"

Method used

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  • Treatment method of gun black tin-nickel alloy electroplating wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1: process the gun black tin-nickel alloy electroplating wastewater containing nickel 300mg / L and potassium pyrophosphate 6500mg / L

[0052] Step 1. Precipitate ammonium ions

[0053]The gun black tin-nickel alloy electroplating wastewater is transported from the wastewater regulating tank to the ammonium ion precipitation tank, the tank liquid is stirred with a mixer, the pH is adjusted to 6 by adding hydrochloric acid, and 10L magnesium chloride solution is added to each ton of wastewater to obtain magnesium ammonium pyrophosphate precipitation things.

[0054] Step 2. Precipitation and separation

[0055] The wastewater flows from the ammonium ion sedimentation tank into the flocculation tank A, and the tank liquid is stirred with a mixer, and the flocculant is added to flocculate the sediment, and the sediment can be aggregated into large particles. The waste water flows from the flocculation tank A into the inclined tube settling tank A, and the sedimen...

Embodiment 2

[0068] Embodiment 2: process the gun black tin-nickel alloy electroplating wastewater containing nickel 100mg / L and potassium pyrophosphate 2000mg / L

[0069] Step 1. Precipitate ammonium ions

[0070] The gun black tin-nickel alloy electroplating wastewater is transported from the wastewater regulating tank to the ammonium ion precipitation tank, hydrochloric acid is added to adjust the pH to 7, 5L of magnesium chloride solution is added to each ton of wastewater, and the pool solution is stirred to obtain magnesium ammonium pyrophosphate precipitate.

[0071] Step 2. Precipitation and separation

[0072] The wastewater flows from the ammonium ion sedimentation tank into the flocculation tank A, and the flocculant is added to flocculate the sediment, and the sediment can be aggregated into large particles. The waste water flows from the flocculation tank A into the inclined tube settling tank A, and the sediment sinks to the bottom of the settling tank. Use a sludge pump to ...

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Abstract

The invention discloses a method for treating gun black tin-nickel alloy electroplating wastewater. Magnesium chloride is added to the wastewater to generate ammonium magnesium pyrophosphate to precipitate and remove ammonium ions. Add ferrous chloride and calcium chloride, adjust pH to 10.5-11.5 with lime emulsion, ferrous ions and calcium ions co-precipitate carboxyl-containing organic acid complexing agent, calcium ions precipitate pyrophosphate, and nickel ions and divalent Tin ions generate pyrophosphate and hydroxide precipitates. Add sodium hypochlorite solution to oxidize other organic matter and adjust the pH of the wastewater to 6-9. The treatment results meet the requirements of GB21900-2008 "Electroplating Pollutant Discharge Standard". The invention establishes a new method for removing carboxyl-containing organic acid complexing agents in waste water by precipitating ferrous ions and calcium ions. The process is simple and easy, the treatment cost is low, and the method has good market application prospects.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, in particular to a treatment method for gun black tin-nickel alloy electroplating wastewater. Background technique [0002] Gun black tin-nickel alloy electroplating wastewater contains ammonium 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 citric acid and other complexing agents, and the treatment cost is high. , it is difficult to effectively remove citric acid in winter when the temperature is low. Therefore, when using the traditional oxidation-hydroxide precipitation method to treat gun black tin-nickel alloy electroplating wastewater containing citric acid, the nickel content in the treated wastewater often does not meet the requirements of GB 21900-2008 "Electroplating Pollutant Discharge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F103/16
CPCC02F1/5245C02F1/56C02F1/76C02F2103/16
Inventor 郭崇武黎小阳赖奂汶
Owner GUANGZHOU ULTRA UNION CHEM LTD
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