CN101070206A - Chemical copper-plating rinsing waste-water treatment process - Google Patents

Abstract

The invention provides a chemical copper plating rinsing waste water treatment process, the basic steps of which are: chemical copper plating rinsing waste water→adjusting pH value→ion exchange→ultrafiltration→reverse osmosis→clean water reuse/concentrated water circulation treatment. Wherein, the specific process is, after adjusting the pH value of the electroless copper plating rinsing wastewater to 3-10, and then passing the ion exchange resin to exchange the heavy metal ions in the wastewater with the same type of ions in the ion exchange resin to recover The heavy metal resources in the wastewater go through an ultrafiltration step to remove the macromolecular impurities contained in the wastewater, and then undergo reverse osmosis treatment to separate the unpurified wastewater and transport it back to the initial rinsing wastewater For recycling, the purified water is recycled. Therefore, the electroless copper plating rinsing wastewater treatment process of the present invention can basically realize zero discharge of rinsing wastewater while recovering heavy metals, and avoid environmental pollution caused by it.

Description

A kind of electroless copper plating rinsing wastewater treatment process

technical field

The invention relates to an electroless copper plating treatment process, in particular to an electroless copper plating wastewater treatment process.

Background technique

As the electroless copper plating technology matures, the electroless copper plating process has begun to be widely used in industrial fields such as anti-EMI treatment of plastic surfaces and surface plating of PCB boards. However, in the electroless copper plating process, the waste water generated during rinsing the workpiece contains heavy metal Cu ²⁺ , so it must be treated before it can be recycled or discharged. Although the traditional chemical precipitation method can effectively remove metal Cu ²⁺ ions in wastewater, it still produces heavy metal sludge that needs professional treatment, which is not good for the environment.

Contents of the invention

The purpose of the present invention is to provide a chemical copper plating rinsing wastewater treatment process to basically realize zero discharge of rinsing wastewater.

The invention adopts the combined process of ion exchange method and reverse osmosis, not only can recover most metal copper resources, but also produces no waste residue and sludge, which is beneficial to the environment.

Its flow process of electroless copper plating rinsing wastewater treatment process of the present invention is:

a. Adjust the pH value, and adjust the pH value of the electroless copper plating rinse wastewater to 3-10;

B. ion exchange, the above-mentioned electroless copper plating rinsing wastewater is passed through an ion exchange resin, so that the heavy metal ions in the wastewater are exchanged with the same type of ions in the ion exchange resin, so as to reclaim the heavy metals in the wastewater;

c. Ultrafiltration, through a semi-permeable membrane to remove macromolecular impurities contained in wastewater;

d. Reverse osmosis, which separates purified and unpurified wastewater through a reverse osmosis membrane;

e. Clean water reuse/concentrated water circulation treatment, recycle the above-mentioned clean water separated by the reverse osmosis membrane, and for the unpurified waste water, send it back to the initial electroless copper plating rinse waste water for retreatment.

Using the electroless copper plating rinsing wastewater treatment process of the present invention, the process itself can become a closed circuit, and can basically realize zero discharge of rinsing wastewater while recovering heavy metals, and avoid environmental pollution caused by it.

Description of drawings

Fig. 1 is a schematic flow chart of the present invention.

Detailed ways

As shown in Figure 1, it is a flow chart of the present invention, can obviously find out by this figure, the present invention begins to adjust pH value 101 steps to electroless copper plating rinsing wastewater, to adjust its pH value to 3～ 10. Then perform the ion exchange 102 step, using the characteristics of the ion exchange resin to exchange the heavy metal ions in the wastewater with the same type of ions in the ion exchange resin to recover the heavy metals in the wastewater, and then go through an ultrafiltration 103 step to pass through the semi-permeable membrane to remove the macromolecular impurities contained in its wastewater, and finally pass a reverse osmosis 104 step to separate the purified and unpurified wastewater, and recycle the purified water, in which copper is hardly detected The presence of ions, and the unpurified wastewater is sent back to the original untreated wastewater through a concentrated water circulation treatment step 105, and re-treated. In this way, the wastewater can be purified by circulation, and zero discharge can be basically achieved.

Claims (1)

1. A kind of chemical copper plating rinse waste water treatment process, the step of this process comprises: a. Adjust the pH value, and adjust the pH value of the electroless copper plating rinse wastewater to 3-10; B. ion exchange, it is characterized in that, utilize ion exchange resin characteristic, make the heavy metal ion in the waste water exchange with ion exchange resin of the same type ion, to reclaim the heavy metal in the waste water; c. Ultrafiltration, through a semi-permeable membrane to remove macromolecular impurities contained in wastewater; d. Reverse osmosis, this step is to separate purified and unpurified wastewater through a reverse osmosis membrane; e. Clean water reuse/concentrated water circulation treatment, recycle the above-mentioned clean water separated by the reverse osmosis membrane, and for the unpurified waste water, send it back to the initial electroless copper plating rinse waste water for retreatment.