Acidic copper-containing etching waste liquid and waste alkali synergistic recovery treatment system

Abstract

The utility model relates to an acidic copper-containing etching waste liquid and waste alkali synergistic recovery treatment system which comprises an acidic copper-containing etching waste liquid collecting tank and a reaction kettle which are sequentially connected, the reaction kettle is respectively connected with an absorption tower and a first centrifugal machine, and the first centrifugal machine is sequentially connected with a washing machine, a second centrifugal machine and a dryer. The first centrifugal machine is further sequentially connected with a waste liquid transfer tank, a membrane concentrator and an evaporation concentrator through pipelines, and the membrane concentrator is further connected with the reaction kettle; the recovery treatment system further comprises a waste alkali collecting tank, an outlet of the waste alkali collecting tank is connected with an inlet of a neutralizing tank through an oil remover, another inlet of the neutralizing tank is connected with a second centrifugal machine, and an outlet of the neutralizing tank is sequentially connected with an ion exchanger and a membrane concentrator. The acidic copper-containing etching waste liquid and waste alkali collaborative recovery treatment system has the advantages of high treatment efficiency, strong controllability, low cost and no waste water, can recover cuprous chloride, sodium chloride and pure water at the same time, enables resources to be reasonably utilized, and has environmental protection benefits and economic benefits.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of printed circuit board waste liquid treatment, and particularly relates to an acid copper-containing etching waste liquid and waste alkali collaborative recovery treatment system. BACKGROUND

[0002] The acid etching waste liquid is a copper-containing waste liquid produced by etching a circuit board using hydrochloric acid in a circuit board preparation process, and the waste liquid is a typical hazardous liquid waste, but the waste is also a high-value composite resource, and has great potential in resource recovery and etching regeneration related technologies.

[0003] Meanwhile, a large amount of oil-containing waste alkali liquid is produced in the circuit board preparation process, and the waste alkali is generally derived from processes such as removal of an etching resist layer, immersion etching of an oxidation film, and cleaning of a metal surface using alkali, and contains oil, 3-5% sodium hydroxide.

[0004] In the prior art, the acid copper-containing etching waste liquid and the waste alkali are generally recovered and treated separately, and no related patent combines the acid copper-containing etching waste liquid and the waste alkali together. SUMMARY

[0005] The utility model discloses a kind of acid copper-containing etching waste liquid and waste alkali collaborative recovery treatment system, with high processing efficiency, controllability, low processing cost, no waste water is generated, copper chloride, sodium chloride and water are recovered simultaneously, so that resource is reasonably utilized, with environmental protection benefit and economic benefit.

[0006] The utility model discloses the technical scheme that the above problems are solved as follows: a kind of acid copper-containing etching waste liquid and waste alkali collaborative recovery treatment system, the recovery treatment system includes acid copper-containing etching waste liquid collection tank, the acid copper-containing etching waste liquid collection tank is connected with reaction kettle, the reaction kettle is also connected with absorption tower and first centrifugal machine respectively, the first centrifugal machine is sequentially connected with washing machine, second centrifugal machine and dryer by pipeline, the first centrifugal machine is also sequentially connected with waste liquid transfer tank, membrane concentrator and evaporation concentrator by pipeline, and the membrane concentrator is also connected with reaction kettle.

[0007] The recovery treatment system further includes a waste alkali collection tank, an outlet of the waste alkali collection tank is connected to an inlet of a neutralization tank via an oil remover, another inlet of the neutralization tank is connected to the second centrifugal machine, an outlet of the neutralization tank is connected to an ion exchanger, and the ion exchanger is connected to the membrane concentrator.

[0008] Preferably, the reaction kettle is provided with a copper powder feeding port.

[0009] Preferably, the reaction kettle and the neutralization tank are provided with spiral stirring paddles.

[0010] Preferably, the oil remover is provided with an inorganic membrane.

[0011] Preferably, the reactor is provided with a temperature sensor for monitoring the reaction temperature in real time.

[0012] Preferably, the neutralization tank is provided with a pH sensor for monitoring the solution pH in real time.

[0013] Preferably, the reactor is further connected with a steam chamber, and a pipeline communicating the reactor with the steam chamber is provided with a first regulating valve.

[0014] Preferably, a pipeline communicating the second centrifuge with the neutralization tank is provided with a second regulating valve, and a pipeline communicating the oil remover with the neutralization tank is provided with a third regulating valve.

[0015] Preferably, the recovery treatment system further comprises a PLC control system.

[0016] More preferably, the PLC control system is connected with the temperature sensor, the pH sensor, the first regulating valve, the second regulating valve and the third regulating valve respectively.

[0017] Preferably, the membrane concentrator and the evaporation concentrator are both connected with a water storage tank.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] (1) The recovery treatment system of the present application can treat the acidic copper-containing etching waste liquid and waste alkali generated in the production process of printed circuit boards, which can improve the recovery treatment efficiency, realize resource utilization and has economic benefits. In addition, the copper chloride, sodium chloride and water can be recovered by the recovery treatment system, which realizes the recycling of resources and avoids secondary pollution.

[0020] (2) The reactor of the present application is provided with a temperature sensor for monitoring the reaction temperature in real time, the neutralization tank is provided with a pH sensor for monitoring the solution pH in real time, the pipeline communicating the reactor with the steam chamber is provided with a first regulating valve, the pipeline communicating the second centrifuge with the neutralization tank is provided with a second regulating valve, the pipeline communicating the oil remover with the neutralization tank is provided with a third regulating valve, and a PLC control system is provided, and the PLC control system is connected with the temperature sensor, the pH sensor, the first regulating valve, the second regulating valve and the third regulating valve respectively. In this way, the treatment process has high controllability and high recovery treatment efficiency.

[0021] (3) The sodium chloride solution obtained by the reaction is concentrated by the membrane concentrator, part of which is returned to the reactor for continuous use, and the other part of the concentrated solution is evaporated and concentrated by the evaporation concentrator to obtain solid sodium chloride. In addition, the water produced by the membrane concentrator and the evaporation concentrator is recovered and stored, which makes the resources be reasonably utilized and has environmental benefits. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The utility model discloses an acidic copper-containing etching waste liquid and waste alkali cooperative recovery treatment system.

[0023] Among them: 1 is acidic copper-containing etching waste liquid collection tank, 2 is reaction kettle, 3 is absorption tower, 4 is first centrifuge, 5 is washing machine, 6 is second centrifuge, 7 is dryer, 8 is waste liquid transfer tank, 9 is membrane concentrator, 10 is evaporation concentrator, 11 is waste alkali collection tank, 12 is oil remover, 13 is neutralization tank, 14 is temperature sensor, 15 is pH sensor, 16 is steam chamber, 17 is first regulating valve, 18 is second regulating valve, 19 is third regulating valve, 20 is water storage tank, 21 is ion exchanger. DETAILED DESCRIPTION

[0024] The utility model will be further described in detail in connection with the drawings embodiment.

[0025] As Figure 1 The utility model discloses an acidic copper-containing etching waste liquid and waste alkali cooperative recovery treatment system.

[0026] An acidic copper-containing etching waste liquid and waste alkali cooperative recovery treatment system, the recovery treatment system includes containing acidic copper-containing etching waste liquid collection tank 1, the acidic copper-containing etching waste liquid collection tank 1 is connected reaction kettle 2, the reaction kettle 2 is provided with copper powder feeding opening, the reaction kettle 2 is equipped with temperature sensor 14 for real-time monitoring reaction temperature, the reaction kettle 2 is also connected steam chamber 16, the pipeline that the reaction kettle 2 is communicated with the steam chamber 16 is provided with first regulating valve 17, the reaction kettle 2 is connected absorption tower 3, first centrifuge 4 respectively, the first centrifuge 4 is sequentially connected washing machine 5, second centrifuge 6, dryer 7 through the pipeline, the first centrifuge 4 is still sequentially connected waste liquid transfer tank 8, membrane concentrator 9, evaporation concentrator 10 through the pipeline, the membrane concentrator 9 is also connected reaction kettle 2, the membrane concentrator 9, the evaporation concentrator 10 are connected with water storage tank 20.

[0027] The recovery treatment system further includes waste alkali collection tank 11, the waste alkali collection tank 11 export is connected neutralization tank 13 one import through oil remover 12, the other import of the neutralization tank 13 is connected the second centrifuge 6, the pipeline that the second centrifuge 6 is communicated with the neutralization tank 13 is provided with second regulating valve 18, the pipeline that the oil remover 12 is communicated with the neutralization tank 13 is provided with third regulating valve 19, the outlet of the neutralization tank 13 is connected ion exchanger 21, the ion exchanger 21 is connected the membrane concentrator 9, the neutralization tank 13 is provided with pH sensor 15 for real-time monitoring solution pH.

[0028] The reaction kettle 2 and the neutralizing tank 13 are provided with spiral stirring paddles.

[0029] The oil removing device 12 is provided with an inorganic membrane.

[0030] The temperature sensor 14, the pH sensor 15, the first adjusting valve 17, the second adjusting valve 18 and the third adjusting valve 19 are connected with the PLC control system and controlled by the PLC.

[0031] The working process of the embodiment will be described in detail below with reference to the drawings:

[0032] The reaction kettle 2 is provided with a heat source through the steam chamber 16. Under stirring, the acidic copper-containing etching waste liquid (containing hydrochloric acid, divalent copper ions, sodium ions, water and the like) in the acidic copper-containing etching waste liquid collecting tank 1 enters the reaction kettle 2 through a pipeline, and the copper powder enters the reaction kettle 2 through the charging port of the reaction kettle 2, and the reaction is carried out under stirring. In the reaction process, the signal of the temperature sensor 14 measuring the internal temperature of the reaction kettle 2 is processed by the PLC control system to control the first adjusting valve 17 between the steam chamber 16 and the pipeline of the reaction kettle 2, so that the reaction temperature in the reaction kettle 2 is 80-90℃. The reaction equation is as follows:

[0033] Cu + Cu 2+ +2Cl - + H2O= 2CuCl ↓+ H2O

[0034] The copper powder acts as a reducing agent to reduce the divalent copper ions in the acidic copper-containing etching waste liquid into monovalent copper ions to obtain CuCl precipitate. The acid mist waste gas generated in the reaction process enters the absorption tower 3. The mixed solution after the reaction is sequentially centrifuged by the first centrifuge 4 to obtain CuCl and the centrifugal mother liquor sodium chloride solution. The CuCl is sequentially washed by the washing machine 5, centrifuged by the second centrifuge 6, and dried by the dryer 7 to obtain CuCl. The centrifugal mother liquor sodium chloride solution enters the membrane concentrator 9 through the waste liquid transfer tank 8.

[0035] The waste alkali in the waste alkali collecting tank 11 enters the neutralizing tank 13 after being deoiled by the oil removing device 12, and is neutralized with the washing liquid obtained after being centrifuged by the second centrifuge 6 (in this process, the pH sensor 15 tests the pH of the solution in the neutralizing tank 13, and the second adjusting valve 18 and the third adjusting valve 19 are controlled by the PLC control system to make the pH of the neutralizing tank 13 meet the set value: pH 7). The neutralized reaction liquid enters the ion exchanger 21 to remove copper, and the neutralized reaction liquid after removing copper enters the membrane concentrator 9 and is combined with the sodium chloride solution to obtain concentrated sodium chloride and water. The water is stored in the water storage tank 20. Part of the concentrated sodium chloride is transported to the reaction kettle 2 (to increase the CuCl conversion rate by adding sodium chloride), and the other part is transported to the evaporation concentrator 10 to evaporate to a saturated state to crystallize solid sodium chloride. The water generated in this process is stored in the water storage tank 20.

[0036] In addition to the above-mentioned embodiments, the utility model also includes other implementation manners, and the technical scheme formed by using equivalent transformation or equivalent replacement should fall within the protection scope of the utility model claims.

Claims

1. A system for the co-recovery and treatment of acidic copper-containing etching waste liquid and waste alkali, characterized in that: The recovery treatment system comprises an acid copper-containing etching waste liquid collecting tank (1) connected with a reaction kettle (2), the reaction kettle (2) is connected with an absorption tower (3) and a first centrifugal machine (4) respectively, the first centrifugal machine (4) is connected with a washing machine (5), a second centrifugal machine (6) and a dryer (7) in sequence through pipelines, the first centrifugal machine (4) is also connected with a waste liquid transfer tank (8), a membrane concentrator (9) and an evaporation concentrator (10) in sequence through pipelines, and the membrane concentrator (9) is also connected with the reaction kettle (2). The recovery treatment system further comprises a waste alkali collecting tank (11), an oil remover (12) is connected with an inlet of a neutralization tank (13) at an outlet of the waste alkali collecting tank (11), another inlet of the neutralization tank (13) is connected with the second centrifugal machine (6), an outlet of the neutralization tank (13) is connected with an ion exchanger (21), and the ion exchanger (21) is connected with the membrane concentrator (9).

2. The system for cooperative recovery treatment of acidic copper-containing etching waste liquid and waste alkali according to claim 1, characterized in that: The reaction kettle (2) is provided with a copper powder feeding port.

3. The system for cooperative recovery treatment of acidic copper-containing etching waste liquid and waste alkali according to claim 1, characterized in that: The reaction kettle (2) and the neutralization tank (13) are provided with spiral stirring paddles.

4. The system for cooperative recovery treatment of acidic copper-containing etching waste liquid and waste alkali according to claim 1, characterized in that: The reaction kettle (2) is provided with a temperature sensor (14) for monitoring the reaction temperature in real time.

5. The system for cooperative recovery treatment of acidic copper-containing etching waste liquid and waste alkali according to claim 1, characterized in that: The neutralization tank (13) is provided with a pH sensor (15) for monitoring the pH of the solution in real time.

6. The system for cooperative recovery treatment of acidic copper-containing etching waste liquid and waste alkali according to claim 1, characterized in that: The reaction kettle (2) is further connected with a steam chamber (16), and a pipeline, through which the reaction kettle (2) and the steam chamber (16) communicate, is provided with a first regulating valve (17).

7. The system for cooperative recovery treatment of acidic copper-containing etching waste liquid and waste alkali according to claim 1, characterized in that: A pipeline, through which the second centrifugal machine (6) and the neutralization tank (13) communicate, is provided with a second regulating valve (18), and a pipeline, through which the oil remover (12) and the neutralization tank (13) communicate, is provided with a third regulating valve (19).

8. The system for cooperative recovery treatment of acidic copper-containing etching waste liquid and waste alkali according to claim 1, characterized in that: The recovery treatment system further comprises a PLC control system.

9. The system for cooperative recovery treatment of acidic copper-containing etching waste liquid and waste alkali according to claim 1, characterized in that: The membrane concentrator (9) and the evaporation concentrator (10) are connected with a water storage tank (20).

Images