Device for preparing basic copper chloride and ammonium chloride by utilizing circuit board etching waste liquid

Abstract

The utility model relates to a device for preparing basic copper chloride and ammonium chloride by utilizing circuit board etching waste liquid, which comprises an acidic etching waste liquid storage device and an alkaline etching waste liquid storage device which are respectively connected with a corresponding acidic etching waste liquid filter and an alkaline etching waste liquid filter. The acidic waste etching liquid filter and the alkaline waste etching liquid filter are respectively connected with the reaction kettle, the reaction kettle is connected with the centrifugal machine, the centrifugal machine is respectively connected with the vacuum drying box and the ion exchange resin tank, the ion exchange resin tank is connected with the dilute acid tank, and the ion exchange resin tank and the electrolytic tank form a circulating pipeline. The ion exchange resin tank is also sequentially connected with an evaporation concentration kettle, a crystallization cooling tank and a filter through pipelines, and the filter is respectively connected with an ammonium chloride tank and the reaction kettle. According to the device for preparing the basic copper chloride and the ammonium chloride by utilizing the circuit board etching waste liquid, the effective components of the etching waste liquid are fully recycled, the utilization rate of the waste liquid is high, resource waste is avoided, and secondary pollution is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of electroplating wastewater treatment, and particularly relates to a device for preparing basic cupric chloride and ammonium chloride by using circuit board etching waste liquid. BACKGROUND

[0002] In recent years, the electronic industry in China has developed very rapidly, and printed circuit boards are important electronic components, which are usually used as support bodies of electronic components and carriers of electronic components. The manufacturing process of printed circuit boards generally includes chemical cleaning, coating photoresist, exposure and development, etching, film removal and other steps. In the process of etching printed circuit boards, a large amount of etching wastewater is generated after the etching liquid is used repeatedly. This kind of wastewater is usually divided into acidic and alkaline types. The main component of alkaline etching liquid is copper ammonia complex, and the main component of acidic etching liquid is cupric chloride. The content of metal copper in the copper-containing etching liquid is as high as 70-120 g / L. Since copper is a heavy metal, it is toxic. Direct discharge of acidic and alkaline waste liquids will pollute the environment, affect the survival of microorganisms in water, destroy the soil aggregate structure, and cause resource waste.

[0003] Currently, there are various ways to recover copper from etching waste liquid, such as chemical method, direct electrolysis method, and extraction followed by electrolysis of copper. However, these methods have high energy consumption and produce difficult-to-treat wastewater with copper ion concentration exceeding the standard. Therefore, in order to reduce energy consumption, save resources, and reduce the concentration of copper ions in waste liquid, there are related patents that neutralize acidic etching waste liquid and alkaline etching waste liquid to recover copper.

[0004] Chinese patent CN 203128222U discloses a device for synthesizing basic cupric chloride from circuit board etching wastewater, which includes an acidic etching liquid storage device, an acidic etching liquid purification and impurity removal tank, an alkaline etching liquid storage device, an alkaline etching liquid purification and impurity removal tank, a neutralization and synthesis tank, a suction filtration tank, a centrifuge, and an air flow dryer connected in series. This patent utilizes the acid-base characteristics of etching wastewater for neutralization and synthesis, effectively reducing the recovery cost of copper ions in wastewater. However, the ammonium chloride produced during neutralization and synthesis is not recovered, which not only increases the workload of subsequent waste liquid treatment but also wastes resources. Moreover, the unreacted copper metal in the waste liquid after obtaining basic cupric chloride still needs to be harmless, which is still far from the goal. SUMMARY

[0005] The purpose of this invention is to provide an apparatus for preparing basic copper chloride and ammonium chloride using circuit board etching waste liquid, ensuring the full resource utilization of the effective components of the etching waste liquid, with high waste liquid utilization rate, not only avoiding resource waste, but also preventing secondary pollution, and realizing the resource utilization and harmlessness of etching waste liquid disposal.

[0006] The technical solution adopted by this utility model to solve the above problems is as follows: an apparatus for preparing basic copper chloride and ammonium chloride using circuit board etching waste liquid, characterized in that: it includes an acidic etching waste liquid storage device and an alkaline etching waste liquid storage device, the acidic etching waste liquid storage device and the alkaline etching waste liquid storage device are respectively connected to corresponding acidic etching waste liquid filters and alkaline etching waste liquid filters, the acidic etching waste liquid filters and the alkaline etching waste liquid filters are respectively connected to a reaction vessel, the outlet of the reaction vessel is connected to the inlet of a centrifuge, the centrifuge is respectively connected to a vacuum drying oven and an ion exchange resin tank, the ion exchange resin tank is connected to a dilute acid tank, the ion exchange resin tank and the electrolytic cell form a circulation pipeline, the ion exchange resin tank is also connected in sequence to an evaporation concentration vessel, a crystallization cooling tank and a filter through pipelines, and the filter is respectively connected to an ammonium chloride tank and the reaction vessel.

[0007] Preferably, the reactor is also connected to a steam chamber.

[0008] Preferably, the reaction vessel is equipped with a stirring device.

[0009] Preferably, the pipe connecting the centrifuge and the ion exchange resin tank is equipped with a flow meter.

[0010] Preferably, the pipe connecting the dilute acid tank and the ion exchange resin tank is equipped with a flow meter.

[0011] Preferably, the electrolytic cell includes a cathode chamber and an anode chamber, which are arranged at intervals via a separating membrane.

[0012] Compared with the prior art, the advantages of this utility model are:

[0013] (1) The device of this utility model can not only recover the basic copper chloride generated by the neutralization of acidic etching solution and alkaline etching solution, but also adsorb copper ions through an ion exchange resin tank after neutralization and centrifugation, and then pass through an evaporation and concentration kettle, a crystallization cooling tank and a filter to obtain ammonium chloride. Furthermore, a dilute acid tank and an electrolytic cell are set up to analyze and electrolyze the copper adsorbed in the ion exchange resin tank to obtain copper. This effectively recovers ammonium chloride and copper, not only avoiding secondary waste liquid pollution generated by the neutralization reaction, but also realizing resource utilization and achieving resource utilization and harmlessness of the etching waste liquid.

[0014] (2) The device of this utility model first neutralizes and recovers basic copper chloride from acidic etching solution and alkaline etching solution, effectively reducing the copper content in the etching solution. Then, it recovers copper through ion exchange resin tank and electrolytic cell, which greatly reduces the copper content in the etching solution, reduces pollution, and recovers copper resources in different forms, thereby improving resource utilization.

[0015] (3) In this utility model device, one outlet of the filter is connected to the ammonium chloride tank, and the other outlet of the filter is connected to the reaction vessel through a pipeline. With this configuration, solid ammonium chloride is obtained by filtration, and the filtrate is returned to the reaction vessel to continue participating in the neutralization reaction. The ion exchange resin tank is connected to the dilute acid tank, and the ion exchange resin tank also forms a circulation pipeline with the electrolytic cell. With this configuration, the acid solution in the dilute acid tank is transported to the ion exchange resin tank to obtain a copper-containing acid solution, and the copper-containing acid solution is transported to the electrolytic cell for electrolysis to obtain metallic copper. The electrolyzed solution can be circulated as an acid solution to the ion resin adsorption tank for continued use. The utility model device has two circulation structures, which can not only save costs, but also maximize the utilization of resources. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the apparatus for preparing basic copper chloride and ammonium chloride using circuit board etching waste liquid in an embodiment of this utility model.

[0017] Among them: 1 is an acidic etching waste liquid storage device, 2 is an alkaline etching waste liquid storage device, 3 is an acidic etching waste liquid filter, 4 is an alkaline etching waste liquid filter, 5 is a reaction vessel, 6 is a centrifuge, 7 is a vacuum drying oven, 8 is an ion exchange resin tank, 9 is a dilute acid tank, 10 is an electrolytic cell, 11 is an evaporation and concentration vessel, 12 is a crystallization cooling tank, 13 is a filter, and 14 is an ammonium chloride storage tank. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0019] like Figure 1 The diagram shown is a schematic representation of the apparatus for preparing basic copper chloride and ammonium chloride using circuit board etching waste liquid in this embodiment.

[0020] An apparatus for preparing basic copper chloride and ammonium chloride using circuit board etching waste liquid includes an acidic etching waste liquid storage device 1 and an alkaline etching waste liquid storage device 2. The acidic etching waste liquid storage device 1 and the alkaline etching waste liquid storage device 2 are respectively connected to corresponding acidic etching waste liquid filters 3 and alkaline etching waste liquid filters 4. The acidic etching waste liquid filters 3 and alkaline etching waste liquid filters 4 are respectively connected to a reaction vessel 5. The outlet of the reaction vessel 5 is connected to the inlet of a centrifuge 6. The centrifuge 6 is respectively connected to a vacuum drying oven 7 and an ion exchange resin tank 8. The ion exchange resin tank 8 is connected to a dilute acid tank 9. The ion exchange resin tank 8 and an electrolytic cell 10 form a circulation pipeline. The ion exchange resin tank 8 is also connected in sequence to an evaporation and concentration vessel 11, a crystallization and cooling tank 12, and a filter 13 through pipelines. The filter 13 is respectively connected to an ammonium chloride storage tank 14 and the reaction vessel 5.

[0021] The reactor 5 is also connected to a steam chamber and is equipped with a stirring device. The centrifuge 6 is connected to the ion exchange resin tank 8 by a flow meter to control the flow rate of copper-containing etching waste liquid entering the ion exchange resin tank. The dilute acid tank 9 is connected to the ion exchange resin tank 8 by a flow meter to control the flow rate of dilute hydrochloric acid entering the ion exchange resin tank 8. The electrolytic cell 10 includes a cathode chamber and an anode chamber, which are arranged alternately by a separating membrane.

[0022] The working process of this embodiment will be described in detail below with reference to the accompanying drawings:

[0023] The acidic etching waste liquid in acidic etching waste liquid storage device 1 is filtered by acidic etching waste liquid filter 3 to remove solid particulate impurities. The alkaline etching waste liquid in alkaline etching waste liquid storage device 2 is filtered by alkaline etching waste liquid filter 4 to remove solid particulate impurities. The filtered acidic and alkaline etching waste liquids enter reaction vessel 5 for neutralization reaction. After the reaction is complete, the reaction mixture is centrifuged and washed by centrifuge 6 and dried by vacuum dryer 7 to obtain basic copper chloride. The upper waste liquid generated after centrifugation is adsorbed by ion exchange resin tank 8 to remove the remaining unreacted substances. The copper ions are removed, and the waste liquid after removing copper is successively evaporated and concentrated in the evaporation and concentration kettle 11, cooled and crystallized in the crystallization cooling tank 12, and filtered by the filter 13 to obtain solid ammonium chloride, which is stored in the ammonium chloride storage tank 14. After the copper ions are adsorbed in the ion exchange resin tank 8, dilute hydrochloric acid in the dilute acid tank 9 is transported to the ion exchange resin tank 8 to obtain a copper-containing acid solution. The copper-containing acid solution is then transported to the electrolytic cell 10 for electrolysis to obtain high-purity metallic copper. On the other hand, the solution after the electrolysis operation does not contain copper ions and is returned to the ion exchange resin tank 8 as backwash liquid for continued use.

[0024] In addition to the above embodiments, this utility model also includes other implementation methods. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of this utility model.

Claims

1. An apparatus for preparing basic copper chloride and ammonium chloride using waste liquid from circuit board etching, characterized in that: The system includes an acid etching waste liquid storage device (1) and an alkaline etching waste liquid storage device (2). The acid etching waste liquid storage device (1) and the alkaline etching waste liquid storage device (2) are respectively connected to the corresponding acid etching waste liquid filter (3) and alkaline etching waste liquid filter (4). The acid etching waste liquid filter (3) and the alkaline etching waste liquid filter (4) are respectively connected to the reactor (5). The outlet of the reactor (5) is connected to the inlet of the centrifuge (6). The centrifuge (6) is respectively connected to the vacuum drying oven (7) and the ion exchange resin tank (8). The ion exchange resin tank (8) is connected to the dilute acid tank (9). The ion exchange resin tank (8) and the electrolytic cell (10) form a circulation pipeline. The ion exchange resin tank (8) is also connected to the evaporation and concentration kettle (11), the crystallization cooling tank (12), and the filter (13) in sequence through pipelines. The filter (13) is respectively connected to the ammonium chloride storage tank (14) and the reactor (5).

2. The apparatus for preparing basic copper chloride and ammonium chloride using circuit board etching waste liquid according to claim 1, characterized in that: The reactor (5) is also connected to a steam chamber.

3. The apparatus for preparing basic copper chloride and ammonium chloride using circuit board etching waste liquid according to claim 1, characterized in that: The reactor (5) is equipped with a stirring device.

4. The apparatus for preparing basic copper chloride and ammonium chloride using circuit board etching waste liquid according to claim 1, characterized in that: A flow meter is installed in the pipe connecting the centrifuge (6) and the ion exchange resin tank (8).

5. The apparatus for preparing basic copper chloride and ammonium chloride using circuit board etching waste liquid according to claim 1, characterized in that: A flow meter is installed in the pipe connecting the dilute acid tank (9) and the ion exchange resin tank (8).

6. The apparatus for preparing basic copper chloride and ammonium chloride using circuit board etching waste liquid according to claim 1, characterized in that: The electrolytic cell (10) includes a cathode chamber and an anode chamber, which are arranged at intervals through a separating membrane.

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