A system and process for the synergic recovery of acidic copper-containing effluents and aluminum mud

Abstract

The present application relates to a kind of acidic copper-containing waste liquid, aluminium mud collaborative recovery processing system and processing process, processing system includes acidic copper-containing waste liquid collection tank, acidic copper-containing waste liquid collection tank is sequentially connected first filter, preheater, preheater is connected condenser and multiple-effect evaporator respectively, multiple-effect evaporator is sequentially connected transfer tank, scrubber, second filter, and second filter is connected sodium chloride solution storage tank and copper sulfate preparation unit respectively;Processing system further includes the aluminium mud bin connected with acidification reaction kettle, and acidification reaction kettle is connected first filter press and condenser respectively, and first filter press is connected evaporation concentration chamber, and evaporation concentration chamber is connected crystalline aluminium chloride preparation unit and liquid polyaluminium chloride preparation unit respectively.The present application processing system and processing process are generated in the production process of printed circuit board acidic copper-containing waste liquid, aluminium mud generated in surface treatment industry are collaboratively treated, improve recovery processing efficiency, realize resource utilization, with economic benefit.

Description

Technical Field

[0001] This invention belongs to the field of surface treatment waste technology, specifically relating to a co-recycling and treatment system and process for acidic copper-containing waste liquid and aluminum sludge. Background Technology

[0002] Acidic copper-containing waste liquid is generated during the circuit board manufacturing process. This waste liquid is an industrial wastewater with high copper content and high acidity generated during the etching of copper foil in the pattern transfer manufacturing process. It is a typical hazardous liquid waste, but it is also a high-value composite resource with great potential in resource recycling and etching regeneration technologies.

[0003] In existing technologies, acidic copper-containing waste liquid and aluminum sludge are generally recycled and treated separately, and no relevant patents combine acidic copper-containing waste liquid and aluminum sludge together. Summary of the Invention

[0004] The purpose of this invention is to provide a co-processing system for acidic copper-containing waste liquid and aluminum sludge, which has high processing efficiency, strong controllability, low processing cost, no wastewater generation, and simultaneously recovers copper sulfate pentahydrate, sodium chloride and water, thus making rational use of resources and achieving both environmental and economic benefits.

[0005] The technical solution adopted by the present invention to solve the above problems is as follows: an acidic copper-containing waste liquid and aluminum sludge co-recycling and treatment system, the recycling and treatment system includes an acidic copper-containing waste liquid collection tank, the acidic copper-containing waste liquid collection tank is connected in sequence to a first filter and a preheater, one outlet of the preheater is connected to a condenser, and the other outlet of the preheater is connected in sequence to a multi-effect evaporator, a transfer tank, a scrubber and a second filter, the second filter is connected to a sodium chloride solution storage tank and a copper sulfate preparation unit respectively.

[0006] The recycling system also includes an aluminum sludge silo, which is connected to an acidification reactor. The acidification reactor is connected to a first filter press and a condenser. The first filter press is connected to an evaporation and concentration chamber, which is also connected to a crystalline aluminum chloride preparation unit and a liquid polyaluminum chloride preparation unit.

[0007] Preferably, the aluminum mud silo is connected to the acidification reactor via a screw feeder.

[0008] Preferably, the multi-effect evaporator is provided with a steam inlet and a steam outlet, the steam inlet being connected to a steam pipe and the steam outlet being connected to the condenser.

[0009] Preferably, the multi-effect evaporator is a triple-effect evaporator, including a first-effect evaporator, a second-effect evaporator, and a third-effect evaporator; the steam inlet of the first-effect evaporator is connected to a steam pipe, the steam outlet of the first-effect evaporator is connected to the steam inlet of the second-effect evaporator via a pipe, the steam outlet of the second-effect evaporator is connected to the steam inlet of the third-effect evaporator via a pipe, and the steam outlet of the third-effect evaporator is connected to the condenser via a pipe; the material inlet of the third-effect evaporator is connected to the preheater via a pipe, the material outlet of the third-effect evaporator is connected to the material inlet of the second-effect evaporator via a pipe, and the material outlet of the second-effect evaporator is connected to the material inlet of the first-effect evaporator via a pipe.

[0010] Preferably, the sodium chloride solution storage tank is also connected to a sodium chloride solid preparation unit.

[0011] Preferably, the acidification reactor is equipped with a spiral stirring paddle.

[0012] Preferably, the crystalline aluminum chloride preparation unit includes a crystallizer and a centrifuge connected in sequence.

[0013] Preferably, the liquid polyaluminum chloride preparation unit includes a polymerization reactor and a second filter press connected in sequence.

[0014] Another objective of this invention is to provide a co-process for the recovery and treatment of acidic copper-containing wastewater and aluminum sludge, comprising the following steps:

[0015] Step 1: The acidic copper-containing waste liquid in the acidic copper waste liquid collection tank enters the first filter to remove solid impurities from the waste liquid.

[0016] Step 2: The waste liquid after removing solid impurities enters the preheater for preliminary heating. During this process, the acid mist HCl waste gas generated enters the condenser for condensation.

[0017] Step 3: The pre-heated waste liquid enters the multi-effect evaporator for evaporation and concentration. During this process, the steam in the steam pipe enters the multi-effect evaporator from the steam inlet, and the residual heat in the steam and the generated acid mist HCl waste gas enter the condenser for condensation through the steam outlet.

[0018] Step 4: The concentrated waste liquid enters the transfer tank, and then is washed by a scrubber and filtered by a second filter to obtain purified basic copper chloride and sodium chloride solutions. The two solutions enter the copper sulfate preparation unit and the sodium chloride solution storage tank, respectively.

[0019] Step 5: Both the aluminum mud in the aluminum mud silo and the hydrochloric acid solution in the condenser enter the acidification reactor. The aluminum mud and hydrochloric acid solution react in the acidification reactor to produce aluminum chloride. After the reaction is complete, a heavy metal scavenger is added. The heavy metal scavenger reacts with the Cu in the mixture. 2+ Cd 2+ Hg2+ Pb 2+ Mn 2+ Ni 2+ Zn 2+ Cr 3+ The heavy metal ions react to form a precipitate, which is then removed by the first filter press. The filtrate enters the evaporation and concentration chamber for evaporation and concentration. Part of the evaporated concentrate enters the crystalline aluminum chloride preparation unit, and the other part enters the liquid polyaluminum chloride preparation unit.

[0020] Preferably, in step five, a portion of the evaporated concentrate enters the crystalline aluminum chloride preparation unit, and the other portion of the evaporated concentrate enters the liquid polyaluminum chloride preparation unit. Specifically, the evaporated concentrate entering the crystalline aluminum chloride preparation unit is sequentially crystallized in a crystallizer and centrifuged in a centrifuge to obtain aluminum chloride crystals; the evaporated concentrate entering the liquid polyaluminum chloride preparation unit is sequentially subjected to a polymerization reaction in a polymerization reactor and filtered by a second filter press to obtain liquid polyaluminum chloride.

[0021] Preferably, the mass ratio of the acidic copper-containing waste liquid to the aluminum sludge is 3-4:1.

[0022] Preferably, the heating temperature in step two is 60-70℃; the reaction temperature in step five is 80℃, and the reaction time is 40-50 min.

[0023] Compared with the prior art, the advantages of the present invention are as follows:

[0024] The recycling system of this invention co-processes acidic copper-containing waste liquid generated during the production of printed circuit boards and aluminum sludge generated in the surface treatment industry, which helps to improve recycling efficiency, realize resource utilization, and has economic benefits. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the acidic copper-containing waste liquid and aluminum sludge co-recovery and treatment system in an embodiment of the present invention.

[0026] The components are as follows: 1 is an acidic copper-containing waste liquid collection tank, 2 is the first filter, 3 is a preheater, 4 is a condenser, 5 is a multi-effect evaporator, 5-1 is a steam inlet, 5-2 is a steam outlet, 6 is a transfer tank, 7 is a scrubber, 8 is a second filter, 9 is a sodium chloride solution storage tank, 10 is a copper sulfate preparation unit, 11 is an aluminum mud silo, 12 is an acidification reactor, 13 is a first filter press, 14 is an evaporation and concentration chamber, 15 is a crystalline aluminum chloride preparation unit, 15-1 is a crystallizer, 15-2 is a centrifuge, 16 is a liquid polyaluminum chloride preparation unit, 16-1 is a polymerization reactor, and 16-2 is a second filter press. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0028] like Figure 1 The diagram shown is a schematic representation of the co-processing system for acidic copper-containing wastewater and aluminum sludge in this embodiment.

[0029] A system for the co-recovery and treatment of acidic copper-containing waste liquid and aluminum sludge, the system comprising an acidic copper-containing waste liquid collection tank 1, the collection tank 1 being sequentially connected to a first filter 2 and a preheater 3, one outlet of the preheater 3 being connected to a condenser 4, and the other outlet of the preheater 3 being sequentially connected to a multi-effect evaporator 5, a transfer tank 6, a scrubber 7, and a second filter 8, the second filter 8 being connected to a sodium chloride solution storage tank 9 and a copper sulfate preparation unit 10.

[0030] The recycling system also includes an aluminum mud silo 11, which is connected to an acidification reactor 12. The acidification reactor 12 is equipped with a spiral agitator and is connected to a first filter press 13 and a condenser 4. The first filter press 13 is connected to an evaporation and concentration chamber 14, which is also connected to a crystalline aluminum chloride preparation unit 15 and a liquid polyaluminum chloride preparation unit 16. The crystalline aluminum chloride preparation unit 15 includes a crystallizer 15-1 and a centrifuge 15-2 connected in sequence. The liquid polyaluminum chloride preparation unit 16 includes a polymerization reactor 16-1 and a second filter press 16-2 connected in sequence.

[0031] The multi-effect evaporator 5 is provided with a steam inlet 5-1 and a steam outlet 5-2. The steam inlet 5-1 is connected to a steam pipe, and the steam outlet 5-2 is connected to the condenser 4. The multi-effect evaporator 5 is a three-effect evaporator, including a first-effect evaporator, a second-effect evaporator, and a third-effect evaporator. The steam inlet of the first-effect evaporator (i.e., the steam inlet 5-1 of the multi-effect evaporator 5) is connected to a steam pipe. The steam outlet of the first-effect evaporator is connected to the steam inlet of the second-effect evaporator through a pipe. The steam outlet of the second-effect evaporator is connected to the steam inlet of the third-effect evaporator through a pipe. The steam outlet of the third-effect evaporator (i.e., the steam outlet 5-2 of the multi-effect evaporator 5) is connected to the condenser 4 through a pipe. The material inlet of the third-effect evaporator is connected to the preheater 3 through a pipe. The material outlet of the third-effect evaporator is connected to the material inlet of the second-effect evaporator through a pipe. The material outlet of the second-effect evaporator is connected to the material inlet of the first-effect evaporator through a pipeline.

[0032] A process for the co-recovery and treatment of acidic copper-containing wastewater and aluminum sludge includes the following steps:

[0033] Step 1: The acidic copper-containing waste liquid in the acidic copper-containing waste liquid collection tank 1 enters the first filter 2 to remove solid impurities from the waste liquid.

[0034] Step 2: The waste liquid after removing solid impurities enters the preheater 3 for preliminary heating at a temperature of 70°C. During this process, the acid mist HCl waste gas generated enters the condenser 4 for condensation.

[0035] Step 3: The pre-heated waste liquid enters the multi-effect evaporator 5 for evaporation and concentration. During this process, the steam in the steam pipe enters the multi-effect evaporator 5 from the steam inlet 5-1. The residual heat in the steam and the generated acid mist HCl waste gas enter the condenser 4 for condensation through the steam outlet 5-2.

[0036] Step 4: The concentrated waste liquid after evaporation enters the transfer tank 6, and then is washed by the scrubber 7 and filtered by the second filter 8 to obtain purified basic copper chloride and sodium chloride solutions, which are then sent to the copper sulfate preparation unit 10 and the sodium chloride solution storage tank 9, respectively.

[0037] Step 5: The aluminum mud in aluminum mud silo 11 and the hydrochloric acid solution in condenser 4 both enter the acidification reactor 12. The aluminum mud and hydrochloric acid solution react in the acidification reactor 12 to produce aluminum chloride. The reaction temperature is 80℃ and the reaction time is 50 minutes. After the reaction is completed, a heavy metal scavenger is added. The heavy metal scavenger reacts with the Cu in the mixture. 2+ Cd 2+ Hg 2+ Pb 2+ Mn 2+ Ni 2+ Zn 2+ Cr 3+ The heavy metal ions react to form a precipitate, which is removed by the first filter press 13. The filtrate enters the evaporation and concentration chamber 14 for evaporation and concentration. The 83.2% (mass fraction) evaporation concentrate enters the crystalline aluminum chloride preparation unit 15, and is successively crystallized by the crystallizer 15-1 and centrifuged by the centrifuge 15-2 to obtain the crystalline aluminum chloride product. The remaining evaporation concentrate enters the liquid polyaluminum chloride preparation unit 16, and is successively subjected to polymerization reaction by the polymerization reactor 16-1 and filtered by the second filter press 16-2 to obtain the liquid polyaluminum chloride.

[0038] The mass ratio of acidic copper-containing waste liquid to aluminum sludge is 4:1.

[0039] In addition to the above embodiments, the present invention also includes other embodiments. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.

Claims

1. A system for the co-recovery and treatment of acidic copper-containing wastewater and aluminum sludge, characterized in that: The recycling system includes an acidic copper-containing waste liquid collection tank (1), which is connected in sequence to a first filter (2) and a preheater (3). One outlet of the preheater (3) is connected to a condenser (4), and the other outlet of the preheater (3) is connected in sequence to a multi-effect evaporator (5), a transfer tank (6), a scrubber (7), and a second filter (8). The second filter (8) is connected to a sodium chloride solution storage tank (9) and a copper sulfate preparation unit (10). The recycling system also includes an aluminum mud silo (11), which is connected to an acidification reactor (12). The acidification reactor (12) is connected to a first filter press (13) and a condenser (4). The first filter press (13) is connected to an evaporation and concentration chamber (14). The evaporation and concentration chamber (14) is also connected to a crystalline aluminum chloride preparation unit (15) and a liquid polyaluminum chloride preparation unit (16).

2. The acidic copper-containing wastewater and aluminum sludge co-recovery and treatment system according to claim 1, characterized in that: The multi-effect evaporator (5) is provided with a steam inlet (5-1) and a steam outlet (5-2). The steam inlet (5-1) is connected to a steam pipe, and the steam outlet (5-2) is connected to the condenser (4).

3. The acidic copper-containing wastewater and aluminum sludge co-recovery and treatment system according to claim 1, characterized in that: The multi-effect evaporator (5) is a three-effect evaporator, including a first-effect evaporator, a second-effect evaporator and a third-effect evaporator.

4. The acidic copper-containing wastewater and aluminum sludge co-recovery and treatment system according to claim 1, characterized in that: The sodium chloride solution storage tank (9) is also connected to a sodium chloride solid preparation unit.

5. The acidic copper-containing wastewater and aluminum sludge co-recovery and treatment system according to claim 1, characterized in that: The acidification reactor (12) is equipped with a spiral stirring paddle.

6. The co-processing system for acidic copper-containing wastewater and aluminum sludge according to claim 1, characterized in that: The crystalline aluminum chloride preparation unit (15) includes a crystallizer (15-1) and a centrifuge (15-2) connected in sequence.

7. The acidic copper-containing wastewater and aluminum sludge co-recovery and treatment system according to claim 1, characterized in that: The liquid polyaluminum chloride preparation unit (16) includes a polymerization reactor (16-1) and a filter press (16-2) connected in sequence.

8. A process for the co-recovery and treatment of acidic copper-containing wastewater and aluminum sludge, characterized in that: Includes the following steps: Step 1: The acidic copper-containing waste liquid in the acidic copper-containing waste liquid collection tank (1) enters the first filter (2) to remove solid impurities in the waste liquid; Step 2: The waste liquid after removing solid impurities enters the preheater (3) to preheat the waste liquid. The acid mist HCl waste gas generated in this process enters the condenser (4) for condensation. Step 3: The pre-heated waste liquid enters the multi-effect evaporator (5) for evaporation and concentration. During this process, the steam in the steam pipe enters the multi-effect evaporator (5) from the steam inlet (5-1). The residual heat in the steam and the generated acid mist HCl waste gas enter the condenser (4) for condensation through the steam outlet (5-2). Step 4: The concentrated waste liquid after evaporation enters the transfer tank (6), and then is washed by the scrubber (7) and filtered by the second filter (8) to obtain purified basic copper chloride and sodium chloride solution. The two are respectively sent to the copper sulfate preparation unit (10) and the sodium chloride solution storage tank (9). Step 5: The aluminum mud in the aluminum mud silo (11) and the hydrochloric acid solution in the condenser (4) both enter the acidification reactor (12). The aluminum mud and hydrochloric acid solution react in the acidification reactor (12) to obtain aluminum chloride. Then, a heavy metal scavenger is added. The heavy metal scavenger reacts with the heavy metal ions in the mixture to form a precipitate, which is removed by the first filter press (13). The filtrate enters the evaporation and concentration chamber (14) for evaporation and concentration. Part of the evaporation concentrate enters the crystalline aluminum chloride preparation unit (15) to obtain crystalline aluminum chloride product, and the other part of the evaporation concentrate enters the liquid polyaluminum chloride preparation unit (16) to obtain liquid aluminum chloride.

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