Method for recycling heavy metal nickel from chemical nickel-plating waste water

Abstract

The invention discloses a method for recycling heavy metal nickel from chemical nickel-plating waste water. The method comprises the following steps: adsorbing the heavy metal nickel which is enrichedin chemical nickel-plating cleaning waste water through ion exchange resin to obtain waste water which contains hypophosphorus; carrying out elution and regeneration on the ion exchange resin to obtain regenerated liquid which contains nickel ions; and carrying out electrochemical catalytic oxidation on the waste water which contains the hypophosphorus, and carrying out electroreduction on the regenerated liquid which contains the nickel ions so as to recycle metallic nickel. Oxidation of the hypophosphorus and synchronous recycling of high-concentration nickel ions can be realized by an electrochemical catalytic oxidation technology, the hypophosphorus in the waste water can be effectively converted into orthophosphorus, and phosphorus is recycled by addition of a precipitator; and the heavy metal nickel can be recycled by electroreduction while the hypophosphorus is oxidized, and the method has the advantages of simplicity, high efficiency, economy and easiness in application in engineering.

Description

Technical field

[0001] The invention relates to the technical field of water treatment, in particular to a method for recovering heavy metal nickel from electroless nickel plating wastewater. Background technique

[0002] Electroless nickel plating is a process in which nickel ions are reduced to metallic nickel using a reducing agent (hypophosphite) and deposited on the surface of the plated article. In recent years, electroless nickel plating technology has been widely used in chemical, military, electronics, aerospace, automotive and other industrial sectors. The electroless nickel plating technology is becoming more and more mature, the application is more and more extensive, the production scale is expanding day by day, and the resulting environmental problems are becoming more and more serious.

[0003] Electroless nickel plating wastewater mainly comes from cleaning wastewater generated when cleaning parts, so it can also be called electroless nickel plating wastewater, whi...

Examples

Embodiment 1

[0031] 1) Take the electroless nickel-plating cleaning wastewater containing hypophosphorous and heavy metal nickel, and use cation exchange resin to adsorb and enrich the heavy metal nickel in the electroless nickel-plating cleaning wastewater to obtain hypophosphorous-containing wastewater;

[0032] 2) Using concentrated hydrochloric acid solution to elute and regenerate the cation exchange resin to obtain a regenerated solution containing nickel ions and chloride ions;

[0033] 3) Such as figure 1 As shown, it is a schematic structural diagram of a dual-chamber electrochemical reactor according to an embodiment of the present invention. Add hypophosphorous waste water to the anode chamber of the double-chamber electrochemical reactor, and add a regenerating solution containing nickel ions and chloride ions to the cathode chamber of the double-chamber electrochemical reactor; The high-performance titanium ruthenium mesh is used as the anode, the titanium sheet is used as the cath...

Embodiment 2

[0040] 1) Take the electroless nickel-plating cleaning wastewater containing hypophosphorous and heavy metal nickel, and use cation exchange resin to adsorb and enrich the heavy metal nickel in the electroless nickel-plating cleaning wastewater to obtain hypophosphorous-containing wastewater;

[0041] 2) Using concentrated hydrochloric acid solution to elute and regenerate the cation exchange resin to obtain a regenerated solution containing nickel ions and chloride ions;

[0042] 3) Such as figure 2 As shown, it is a schematic structural diagram of a three-compartment electrochemical reactor according to an embodiment of the present invention. Add hypophosphorous waste water to the anode chamber of the three-chamber electrochemical reactor, add a regenerating solution containing nickel ions and chloride ions to the cathode chamber of the three-chamber electrochemical reactor, and add to the three-chamber electrochemical reactor Add 0.1mol / L hydrochloric acid solution to the compa...

Embodiment 3

[0047] 1) Take the electroless nickel-plating cleaning wastewater containing hypophosphorous and heavy metal nickel, and use cation exchange resin to adsorb and enrich the heavy metal nickel in the electroless nickel-plating cleaning wastewater to obtain hypophosphorous-containing wastewater;

[0048] 2) The cation exchange resin is eluted and regenerated with a concentrated sulfuric acid solution to obtain a regeneration solution containing nickel ions and sulfate ions;

[0049] 3) Such as image 3 As shown, it is a schematic structural diagram of a three-compartment electrochemical reactor according to an embodiment of the present invention. Add hypophosphorous waste water to the anode chamber of the three-chamber electrochemical reactor, add a regenerating solution containing nickel ions and sulfate ions to the cathode chamber of the three-chamber electrochemical reactor, Add 0.02mol / L sulfuric acid solution to the middle compartment; use the highly efficient and stable rutheni...

Technical field

[0001] The invention relates to the technical field of water treatment, in particular to a method for recovering heavy metal nickel from electroless nickel plating wastewater. Background technique

[0002] Electroless nickel plating is a process in which nickel ions are reduced to metallic nickel using a reducing agent (hypophosphite) and deposited on the surface of the plated article. In recent years, electroless nickel plating technology has been widely used in chemical, military, electronics, aerospace, automotive and other industrial sectors. The electroless nickel plating technology is becoming more and more mature, the application is more and more extensive, the production scale is expanding day by day, and the resulting environmental problems are becoming more and more serious.

[0003] Electroless nickel plating wastewater mainly comes from cleaning wastewater generated when cleaning parts, so it can also be called electroless nickel plating wastewater, whi...

Examples

Embodiment 1

[0031] 1) Take the electroless nickel-plating cleaning wastewater containing hypophosphorous and heavy metal nickel, and use cation exchange resin to adsorb and enrich the heavy metal nickel in the electroless nickel-plating cleaning wastewater to obtain hypophosphorous-containing wastewater;

[0032] 2) Using concentrated hydrochloric acid solution to elute and regenerate the cation exchange resin to obtain a regenerated solution containing nickel ions and chloride ions;

[0033] 3) Such as figure 1 As shown, it is a schematic structural diagram of a dual-chamber electrochemical reactor according to an embodiment of the present invention. Add hypophosphorous waste water to the anode chamber of the double-chamber electrochemical reactor, and add a regenerating solution containing nickel ions and chloride ions to the cathode chamber of the double-chamber electrochemical reactor; The high-performance titanium ruthenium mesh is used as the anode, the titanium sheet is used as the cath...

Embodiment 2

[0040] 1) Take the electroless nickel-plating cleaning wastewater containing hypophosphorous and heavy metal nickel, and use cation exchange resin to adsorb and enrich the heavy metal nickel in the electroless nickel-plating cleaning wastewater to obtain hypophosphorous-containing wastewater;

[0041] 2) Using concentrated hydrochloric acid solution to elute and regenerate the cation exchange resin to obtain a regenerated solution containing nickel ions and chloride ions;

[0042] 3) Such as figure 2 As shown, it is a schematic structural diagram of a three-compartment electrochemical reactor according to an embodiment of the present invention. Add hypophosphorous waste water to the anode chamber of the three-chamber electrochemical reactor, add a regenerating solution containing nickel ions and chloride ions to the cathode chamber of the three-chamber electrochemical reactor, and add to the three-chamber electrochemical reactor Add 0.1mol / L hydrochloric acid solution to the compa...

Embodiment 3

[0047] 1) Take the electroless nickel-plating cleaning wastewater containing hypophosphorous and heavy metal nickel, and use cation exchange resin to adsorb and enrich the heavy metal nickel in the electroless nickel-plating cleaning wastewater to obtain hypophosphorous-containing wastewater;

[0048] 2) The cation exchange resin is eluted and regenerated with a concentrated sulfuric acid solution to obtain a regeneration solution containing nickel ions and sulfate ions;

[0049] 3) Such as image 3 As shown, it is a schematic structural diagram of a three-compartment electrochemical reactor according to an embodiment of the present invention. Add hypophosphorous waste water to the anode chamber of the three-chamber electrochemical reactor, add a regenerating solution containing nickel ions and sulfate ions to the cathode chamber of the three-chamber electrochemical reactor, Add 0.02mol / L sulfuric acid solution to the middle compartment; use the highly efficient and stable rutheni...

Images