Unlock instant, AI-driven research and patent intelligence for your innovation.

Combination treatment method of electroless nickel plating wastewater

A technology of electroless nickel plating and treatment methods, which is applied in the fields of metallurgical wastewater treatment, chemical instruments and methods, oxidized water/sewage treatment, etc., and can solve the problems of unreachable nickel treatment results, high treatment costs, and large power consumption. Achieve good market application prospects, overcome low efficiency and low processing cost

Active Publication Date: 2021-08-31
GUANGZHOU ULTRA UNION CHEM LTD
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method is lengthy, the equipment occupies a large area, and the treatment cost is high, especially the waste water needs to be heated to 80 ｏ C, it is difficult to implement in electroplating enterprises
[0005] Literature [1] reported the combined treatment method of electroless nickel plating wastewater, using Fenton method oxidation and zeolite adsorption to jointly treat electroless nickel plating wastewater, the nickel treatment results did not meet the requirements in Table 3 of GB 21900-2008, and the treatment cost was high
[0006] Literature [2] reported a UV / H 2 o 2 The method for treating electroless nickel-plating wastewater by technology, the mass concentration of nickel in the wastewater after treatment is 0.43 mg / L, the treatment cost of this method is high, and it can only meet the requirements in Table 2 of GB 21900-2008
[0007] Literature [3] reported a method of electrocatalytic oxidation-chemical precipitation coupling process to treat electroless nickel plating wastewater, which consumes a lot of power and severely corrodes the wastewater treatment equipment, so it is not suitable for large-scale electroless nickel plating wastewater treatment

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048]The current electroless nickel plating solution generally contains nickel sulfate, sodium hypophosphite, sodium citrate, sodium lactate, and sodium phosphate, etc., and these components can be treated.

[0049] Step 1. Precipitate nickel ions

[0050] The electroless nickel plating wastewater contains nickel 100 mg / L, citric acid 167 mg / L, lactic acid 167 mg / L, and total phosphorus 175 mg / L. The wastewater flows from the electroless nickel plating wastewater regulating tank into the precipitation reaction tank A. Under stirring conditions, dilute hydrochloric acid is added to adjust and maintain the pH of the electroless nickel plating wastewater to 4.5-5.5, and 8 L of precipitant is added to each ton of wastewater; Pool A flows into flocculation pool A, adding flocculant, the amount of flocculant added can make the sediment aggregate into large particles; wastewater flows from flocculation pool A into inclined tube settling pool A, and the sediment sinks to the bottom o...

Embodiment 2

[0070] Step 1. Precipitate nickel ions

[0071] The electroless nickel plating wastewater contains 200 mg / L nickel, 333 mg / L citric acid, 333 mg / L lactic acid and 350 mg / L total phosphorus. The wastewater flows from the electroless nickel plating wastewater adjustment tank into the precipitation reaction tank A. Under stirring conditions, dilute hydrochloric acid is added to adjust and maintain the pH of the wastewater to 4.5-5.5, and 14 L of precipitant is added to each ton of wastewater; the wastewater flows from the precipitation reaction tank A into Flocculation tank A, add flocculant, the amount of flocculant added can make the sediment aggregate into large particles; wastewater flows from flocculation tank A into inclined tube settlement tank A, and the sediment sinks to the bottom of the settlement tank.

[0072] Step 2. Nickel recovery

[0073] Use a sludge pump to pump the sediment at the bottom of the inclined tube settling tank A into the plate and frame filter pre...

Embodiment 3

[0091] Step 1. Precipitate nickel ions

[0092] The electroless nickel plating wastewater contains 300 mg / L nickel, 500 mg / L citric acid, 500 mg / L lactic acid and 525 mg / L total phosphorus. The waste water flows into the precipitation reaction tank A from the electroless nickel plating waste water regulating tank. Under the condition of stirring, dilute hydrochloric acid is added to adjust and maintain the pH of the waste water to 4.5-5.5, and 20 L of precipitant is added to each ton of waste water; the waste water flows from the precipitation reaction tank A into Flocculation tank A, add flocculant, the amount of flocculant added can make the sediment aggregate into large particles; wastewater flows from flocculation tank A into inclined tube settlement tank A, and the sediment sinks to the bottom of the settlement tank.

[0093] Step 2. Nickel recovery

[0094] Use a sludge pump to pump the sediment at the bottom of the inclined tube settling tank A into the plate and frame...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a combined treatment method for electroless nickel-plating wastewater. The pH of the electroless nickel-plating wastewater is adjusted to 4-6, sodium dimethyldithiocarbamate is added to precipitate nickel, a flocculant is added to aggregate precipitated particles, and the precipitate is filtered and separated. Use lime emulsion to adjust and maintain the pH of the wastewater to 11-12, add sodium hypochlorite solution to oxidize hypophosphite and other organic matter, add calcium chloride to precipitate phosphate, and then add ferrous chloride to precipitate organic acids containing carboxyl groups in the wastewater; Separation and filtration after adding flocculant, that is. The combined treatment method of electroless nickel plating waste water of the present invention, the treatment result meets the requirements of Table 3 and Table 2 of GB 21900-2008 "Electroplating Pollutant Discharge Standard", and overcomes the technical defect that the traditional one-step precipitation method is difficult to recycle nickel, and the obtained Nickel deposits can be recycled, the cost of wastewater treatment is low, and it has a good market application prospect.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, in particular to a treatment method for electroless nickel plating wastewater. Background technique [0002] The electroless nickel plating solution contains nickel sulfate, sodium citrate, sodium lactate, sodium hypophosphite and other components. Due to the strong oxidation resistance of citrate, the efficiency of oxidizing citrate with conventional oxidation methods is very low, and it is often necessary to add a large amount of hydrogen peroxide to effectively destroy citrate, resulting in a sharp rise in wastewater treatment costs. [0003] The Chinese invention patent "A Method for Treating Chemical Nickel Wastewater" with the application announcement number "CN 105884078 A" discloses a traditional technical solution: use sodium hypochlorite solution to oxidize the nickel in the chemical nickel plating wastewater under the condition of pH 10-12. As a complexing agent, nickel i...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/20C02F101/34C02F103/16
CPCC02F1/001C02F1/5236C02F1/54C02F1/56C02F1/66C02F1/76C02F9/00C02F2101/20C02F2101/34C02F2103/16C02F2209/04C02F2301/08
Inventor 郭崇武赖奂汶
Owner GUANGZHOU ULTRA UNION CHEM LTD