Acid recycling system and method

Abstract

The invention relates to the technical field of acid recycling, in particular to an acid recycling system and method. Comprising a first pickling tank, a second pickling tank and a third pickling tank, an acid mist evaporator is arranged on the first pickling tank, an acid preparation barrel and an acid mist condenser are arranged on the third pickling tank, air suction pipes are arranged on the first pickling tank, the second pickling tank and the third pickling tank, and acid washing towers are arranged on the air suction pipes. The method comprises the following steps: collecting acid liquor in an acid washing tower, discharging the acid liquor into an acid mist evaporator, collecting acid mist generated in an operation process of the acid liquor into the acid washing tower, then generating acid-containing wastewater, discharging the acid-containing wastewater into the acid mist evaporator, heating and separating the acid-containing wastewater and waste acid after the acid-containing wastewater and the waste acid enter the acid mist evaporator to generate high-temperature acid mist and wastewater, and discharging the wastewater. And the high-temperature acid mist enters the acid mist condenser to be condensed to form high-concentration recycled acid, and the recycled acid can be added into the third pickling tank again to be recycled.

Description

Technical Field

[0001] The present invention relates to the technical field of acid recycling, and in particular to an acid recycling system and method. Background Art

[0002] Steel wire pickling is a commonly used surface treatment process, which is mainly used to remove rust, scale, oil, dust and other pollutants on the surface of steel wire, making the surface of steel wire cleaner, flatter and smoother, providing a good foundation for subsequent electroplating, spraying and other treatments.

[0003] However, in the conventional pickling process of steel wire, the acid solution is only used for pickling once and then discharged, thereby causing waste of the acid solution and increasing the consumption of the acid solution during pickling. Summary of the invention

[0004] The object of the present invention is to provide an acid recycling system and method, aiming to solve the technical problem that in the existing steel wire pickling treatment, the acid liquid used is only used for pickling once and then discharged, thereby causing waste of acid liquid and increasing the consumption of acid liquid during pickling.

[0005] To achieve the above-mentioned purpose, the present invention adopts an acid recycling system, comprising a first pickling tank, a second pickling tank and a third pickling tank, the first pickling tank is provided with an acid mist evaporator, the third pickling tank is provided with an acid distribution barrel and an acid mist condenser, the first pickling tank, the second pickling tank and the third pickling tank are provided with a suction pipe, the suction pipe is provided with an acid washing tower, the first pickling tank is connected to the second pickling tank, and the second pickling tank is connected to the third pickling tank.

[0006] The first pickling tank is provided with a raw steel wire inlet, the third pickling tank is provided with a clean steel wire outlet, and the acid mist evaporator is provided with a wastewater outlet.

[0007] Wherein, the acid mist evaporator is connected to the acid mist condenser, and the acid washing tower is connected to the acid mist evaporator.

[0008] The present invention also provides an acid recycling method, which is applied to the above-mentioned acid recycling system and comprises the following steps:

[0009] S1: First, the acid solution is adjusted in the acid preparation barrel to make new acid, and then continuously added into the third pickling tank;

[0010] S2: The acid solution overflows from the third pickling tank into the second pickling tank, and then overflows from the second pickling tank into the first pickling tank, so that the raw steel wire fully utilizes the acid solution, and the waste acid generated is discharged into the acid mist evaporator;

[0011] S3: Acid mist is generated during the operation of the acid solution in the first pickling tank, the second pickling tank and the third pickling tank, and the acid mist is collected into the acid washing tower through the suction pipe, and acid-containing wastewater is discharged into the acid mist evaporator;

[0012] S4: After the acid-containing wastewater and waste acid enter the acid mist evaporator, they are heated and separated to generate high-temperature acid mist and wastewater, wherein the wastewater is discharged, and the high-temperature acid mist enters the acid mist condenser to be condensed to form a high-concentration reuse acid.

[0013] Among them, in step S2, the raw steel wire enters the first pickling tank, the second pickling tank and the third pickling tank in sequence through the raw steel wire inlet, and the steel wire is cleaned in the three pickling tanks to become clean steel wire, and the clean steel wire is discharged through the clean steel wire outlet.

[0014] Among them, in step 2, the raw steel wire is cleaned by countercurrent water washing.

[0015] Wherein, in step S4, the recycled acid can be added back into the third pickling tank for recycling.

[0016] An acid recycling system and method of the present invention comprises a first pickling tank, a second pickling tank and a third pickling tank, wherein the first pickling tank is provided with an acid mist evaporator, the third pickling tank is provided with an acid distribution barrel and an acid mist condenser, the first pickling tank, the second pickling tank and the third pickling tank are provided with an air suction pipe, the air suction pipe is provided with an acid washing tower, the first pickling tank is connected with the second pickling tank, the second pickling tank is connected with the third pickling tank, the waste acid generated after the use of the acid solution is discharged into the acid mist evaporator, and the acid mist generated during the operation of the acid solution is collected to Acid-containing wastewater is subsequently generated in the acid washing tower, and then the acid-containing wastewater is discharged into the acid mist evaporator. After the acid-containing wastewater and waste acid enter the acid mist evaporator, they are heated and separated to generate high-temperature acid mist and wastewater, wherein the wastewater is discharged, and the high-temperature acid mist enters the acid mist condenser for condensation to form high-concentration recycled acid, and the recycled acid can be re-added to the third pickling tank for recycling, thereby effectively solving the technical problem that the acid solution used in the existing steel wire pickling treatment is only used for pickling once and then discharged, thereby causing waste of acid solution, and at the same time increasing the consumption of acid solution during pickling. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the principle of an acid recycling system and method of the present invention.

[0019] Figure 2 The present invention is a flow chart of the steps of an acid recycling method.

[0020] 1-raw steel wire inlet, 2-first pickling tank, 3-second pickling tank, 4-third pickling tank, 5-clean steel wire outlet, 6-acid mist, 7-suction pipe, 8-acid washing tower, 9-acid-containing wastewater, 10-waste acid, 11-acid mist evaporator, 12-high-temperature acid mist, 13-acid mist condenser, 14-wastewater outlet, 15-recycled acid, 16-acid preparation barrel, 17-acid liquid. DETAILED DESCRIPTION

[0021] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0022] See also Figure 1 to Figure 2 The present invention provides an acid recycling system, comprising a first pickling tank 2, a second pickling tank 3 and a third pickling tank 4, wherein the first pickling tank 2 is provided with an acid mist evaporator 11, the third pickling tank 4 is provided with an acid preparation barrel 16 and an acid mist condenser 13, the first pickling tank 2, the second pickling tank 3 and the third pickling tank 4 are provided with a suction pipe 7, the suction pipe 7 is provided with an acid washing tower 8, the first pickling tank 2 is connected to the second pickling tank 3, and the second pickling tank 3 is connected to the third pickling tank 4.

[0023] In this embodiment, the waste acid 10 generated after the use of the acid solution 17 is discharged into the acid mist evaporator 11, and the acid mist 6 generated during the operation of the acid solution 17 is collected in the acid washing tower 8, and then acid-containing wastewater 9 is generated, and the acid-containing wastewater 9 is discharged into the acid mist evaporator 11. After the acid-containing wastewater 9 and the waste acid 10 enter the acid mist evaporator 11, they are heated and separated to generate high-temperature acid mist 12 and wastewater, wherein the wastewater is discharged, and the high-temperature acid mist 12 enters the acid mist condenser 13 for condensation to form a high-concentration recycled acid 15, and the recycled acid 15 can be re-added to the third pickling tank 4 for recycling, thereby effectively solving the problem that the acid solution 17 used in the existing steel wire pickling treatment is only pickled once and then discharged, resulting in waste of the acid solution 17, and at the same time, the technical problem of increasing the consumption of the acid solution 17 during pickling.

[0024] Furthermore, the first pickling tank 2 is provided with a raw steel wire inlet 1, the third pickling tank 4 is provided with a clean steel wire outlet 5, and the acid mist evaporator 11 is provided with a wastewater outlet 14.

[0025] In this embodiment, the raw steel wire inlet 1 can facilitate the entry of the raw steel wire, the clean steel wire outlet 5 can facilitate the discharge of the clean steel wire after washing, and the wastewater outlet 14 can facilitate the discharge of wastewater.

[0026] Furthermore, the acid mist evaporator 11 is connected to the acid mist condenser 13 , and the acid washing tower 8 is connected to the acid mist evaporator 11 .

[0027] In this embodiment, the acid-containing wastewater 9 and the waste acid 10 are introduced into the acid mist evaporator 11 and then heated and separated to generate high-temperature acid mist 12 and wastewater, wherein the wastewater is discharged and the high-temperature acid mist 12 enters the acid mist condenser 13 for condensation to form a high-concentration recycled acid 15.

[0028] The present invention also provides an acid recycling method, which is applied to the above-mentioned acid recycling system and comprises the following steps:

[0029] S1: First, the acid solution 17 is adjusted in concentration in the acid preparation barrel 16 to make new acid, and then continuously added into the third pickling tank 4;

[0030] S2: The acid solution 17 overflows from the third pickling tank 4 into the second pickling tank 3, and then overflows from the second pickling tank 3 into the first pickling tank 2, so that the raw steel wire fully utilizes the acid solution 17, and the generated waste acid 10 is discharged into the acid mist evaporator 11;

[0031] S3: The acid solution 17 generates acid mist 6 during operation in the first pickling tank 2, the second pickling tank 3 and the third pickling tank 4, and the acid mist 6 is collected into the acid washing tower 8 through the suction pipe 7, and the acid-containing wastewater 9 is generated and discharged into the acid mist evaporator 11;

[0032] S4: After the acid-containing wastewater 9 and waste acid 10 enter the acid mist evaporator 11, they are heated and separated to generate high-temperature acid mist 12 and wastewater, wherein the wastewater is discharged, and the high-temperature acid mist 12 enters the acid mist condenser 13 for condensation to form high-concentration reuse acid 15.

[0033] Furthermore, in step S2, the raw steel wire enters the first pickling tank 2, the second pickling tank 3 and the third pickling tank 4 in sequence through the raw steel wire inlet 1, and the steel wire is cleaned in the three pickling tanks to become clean steel wire, and the clean steel wire is discharged through the clean steel wire outlet 5.

[0034] Furthermore, in step 2, the raw steel wire is cleaned by countercurrent water washing.

[0035] In this embodiment, the raw steel wire is cleaned by countercurrent water washing to ensure that the surface of the steel wire is fully cleaned.

[0036] Furthermore, in step S4, the recycled acid 15 can be added back into the third pickling tank 4 for recycling.

[0037] In this embodiment, the waste acid 10 generated after the use of the acid solution 17 is discharged into the acid mist evaporator 11, and the acid mist 6 generated during the operation of the acid solution 17 is collected in the acid washing tower 8, and then acid-containing wastewater 9 is generated, and the acid-containing wastewater 9 is discharged into the acid mist evaporator 11. After the acid-containing wastewater 9 and the waste acid 10 enter the acid mist evaporator 11, they are heated and separated to generate high-temperature acid mist 12 and wastewater, wherein the wastewater is discharged, and the high-temperature acid mist 12 enters the acid mist condenser 13 for condensation to form a high-concentration recycled acid 15, and the recycled acid 15 can be re-added to the third pickling tank 4 for recycling. The design can significantly reduce the acid consumption of pickling, and can significantly reduce the emission of acid-containing waste gas and acid-containing wastewater 9, thereby effectively solving the existing problem that the acid solution 17 used in the steel wire pickling treatment is only pickled once and then discharged, resulting in waste of the acid solution 17, and at the same time, the technical problem of increasing the consumption of the acid solution 17 during pickling.

[0038] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. An acid recycling system, characterized in that: It includes a first pickling tank, a second pickling tank and a third pickling tank, wherein the first pickling tank is provided with an acid mist evaporator, the third pickling tank is provided with an acid distribution barrel and an acid mist condenser, the first pickling tank, the second pickling tank and the third pickling tank are provided with suction pipes, the suction pipes are provided with an acid washing tower, the first pickling tank is connected to the second pickling tank, and the second pickling tank is connected to the third pickling tank.

2. The acid recycling system according to claim 1, characterized in that: The first pickling tank is also provided with a raw steel wire inlet, the third pickling tank is also provided with a clean steel wire outlet, and the acid mist evaporator is provided with a wastewater outlet.

3. The acid recycling system according to claim 2, characterized in that: The acid mist evaporator is connected to the acid mist condenser, and the acid washing tower is connected to the acid mist evaporator.

4. An acid recycling method, applied to the acid recycling system as claimed in claim 3, characterized in that: The steps include: S1: First, the acid solution is adjusted in the acid preparation barrel to make new acid, and then continuously added into the third pickling tank; S2: The acid solution overflows from the third pickling tank into the second pickling tank, and then overflows from the second pickling tank into the first pickling tank, so that the raw steel wire fully utilizes the acid solution, and the waste acid generated is discharged into the acid mist evaporator; S3: Acid mist is generated during the operation of the acid solution in the first pickling tank, the second pickling tank and the third pickling tank, and the acid mist is collected into the acid washing tower through the suction pipe, and acid-containing wastewater is discharged into the acid mist evaporator; S4: After the acid-containing wastewater and waste acid enter the acid mist evaporator, they are heated and separated to generate high-temperature acid mist and wastewater, wherein the wastewater is discharged, and the high-temperature acid mist enters the acid mist condenser to be condensed to form a high-concentration reuse acid.

5. The acid recycling method according to claim 4, characterized in that: In step S2, the raw steel wire enters the first pickling tank, the second pickling tank and the third pickling tank in sequence through the raw steel wire inlet, and the steel wire is cleaned in the three pickling tanks to become clean steel wire, and the clean steel wire is discharged through the clean steel wire outlet.

6. The acid recycling method according to claim 5, characterized in that: In step 2, the raw steel wire is cleaned by countercurrent water washing.

7. The acid recycling method according to claim 6, characterized in that: In step S4, the recycled acid can be added back into the third pickling tank for recycling.

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