An equipment and method for recycling waste acid from titanium dioxide production lines into acidolysis equipment.

Abstract

This invention relates to the field of titanium dioxide waste acid recycling, and discloses an acidolysis equipment and method for recycling titanium dioxide waste acid in titanium dioxide production lines. This effectively solves the problem of resource waste caused by neutralization treatment of waste acid generated during titanium dioxide production. The concentration device includes a concentration cylinder with an inlet pipe and an inlet valve installed at the top of one side. A drain pipe with a heating coil is installed at the bottom of one side of the concentration cylinder. A heating coil is also installed on the inner bottom wall of the concentration cylinder. This invention uses rotating blades inside the waste acid to stir it, improving heating uniformity. Simultaneously, the rotating shaft and fan blades drive gas from the concentration cylinder into the treatment cylinder, increasing the rate of water vapor discharge from the waste acid and improving waste acid treatment efficiency. After concentration, the concentrated sulfuric acid is recycled to the acidolysis process in the titanium dioxide production line, saving production costs and improving resource utilization.

Description

Technical Field

[0001] This invention belongs to the field of titanium dioxide waste acid recycling, specifically a device and method for recycling titanium dioxide waste acid for acidolysis in titanium dioxide production lines. Background Technology

[0002] In the sulfuric acid process for titanium dioxide production, the hydrolyzed metatitanic acid slurry, after filtration (sheet loading), generates approximately 4 t / t TiO2 of concentrated waste acid with a concentration of about 25%. Half an hour before bleaching and washing, it generates approximately 2.0 t / t TiO2 of dilute waste acid with a concentration of about 18%. The generated waste acid is discharged with the wastewater to the wastewater treatment process, where it is neutralized and aerated using limestone and lime. After treatment and pressing, the wastewater meets discharge standards, and the waste residue (yellow gypsum) is transported to a quarry for landfill. However, the following drawbacks still exist:

[0003] The high content of ferrous sulfate and sulfuric acid in the waste acid greatly increases the amount of neutralizing agent required, as well as the workload of the neutralization and aeration systems. At the same time, the amount of waste residue discharged after wastewater treatment almost doubles, increasing the cost of waste residue treatment and wasting sulfur resources. Summary of the Invention

[0004] In view of the above situation and to overcome the shortcomings of the prior art, the present invention provides an acid hydrolysis equipment and method for recycling waste acid from titanium dioxide production lines, which effectively solves the problem that the waste acid generated during titanium dioxide production is easily wasted due to neutralization treatment.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for recycling waste acid from titanium dioxide production lines for acidolysis, comprising the following steps:

[0006] 1. Put the waste acid into the concentration device, open the liquid inlet valve, and let the waste acid into the concentration cylinder from the liquid inlet pipe. Then, let cold water into the treatment cylinder from the water inlet pipe until the cold water level is below the float.

[0007] 2. The heating coil is energized to heat the waste acid inside the concentration cylinder. The motor is turned on, causing the shaft to rotate, which in turn causes the stirring blades to stir the waste acid, making the waste acid heated evenly.

[0008] 3. After the waste acid is heated, water vapor is generated. When the shaft rotates, the fan blades rotate, which drives the water vapor from the air inlet into the first connecting tank. After flowing through the first pipe, the second pipe, the third pipe and the discharge tank, it enters the treatment cylinder through the connecting pipe and so on, and liquefies upon contact with cold water.

[0009] 4. After the waste acid is concentrated to a sulfuric acid concentration of 50%, shut down the equipment, open the drain valve, and discharge the concentrated sulfuric acid from the drain pipe.

[0010] A device for recycling waste acid from titanium dioxide production line includes a concentration unit. The concentration unit includes a concentration cylinder, an inlet pipe with an inlet valve installed at the top of one side of the concentration cylinder, a drain pipe with a heating coil installed at the drain pipe, a heating coil installed on the inner bottom wall of the concentration cylinder, and a waste liquid stirring assembly installed on the concentration cylinder.

[0011] Preferably, the waste liquid stirring assembly includes a rotating trough opened at the top of the concentration cylinder, a rotating shaft is rotatably installed inside the rotating trough, stirring blades are evenly installed on the outside of the rotating shaft, the stirring blades are located inside the waste acid, a limiting bottom plate is installed on the rotating shaft, the limiting bottom plate is in contact with the inner top wall of the concentration cylinder, a limiting top plate is installed at the top of the rotating shaft, and the bottom end of the limiting top plate is in contact with the top wall of the concentration cylinder.

[0012] Preferably, a top cylinder is installed at the top of the limiting top plate, a gear ring is installed on the outer wall of the top cylinder, a motor is meshed with one side of the gear ring, the motor is fixedly connected to the output shaft of the gear, the gear is fixedly installed on the top of the concentrator, and a steam discharge assembly is installed on the rotating shaft.

[0013] Preferably, the steam discharge assembly includes a first connecting groove formed inside the rotating shaft. The first connecting groove is annular, and suction holes are evenly distributed on the outer side of the first connecting groove, penetrating into the interior of the concentration cylinder. The suction holes are located above the waste acid liquid surface. A discharge groove is formed inside the rotating shaft, with the bottom end of the discharge groove below the waste acid liquid surface and the top end of the discharge groove penetrating into the interior of the top cylinder. Fan blades are installed at equal angles on the inner wall of the top cylinder, and the fan blades are inclined. An exhaust pipe is installed at the top of the top cylinder, and a steam treatment assembly is installed at the end of the exhaust pipe away from the top cylinder.

[0014] Preferably, a first through pipe is installed at an equal angle on the outer side of the rotating shaft. One end of the first through pipe is connected to the inside of the first connecting groove. A second through pipe is installed at the end of the first through pipe away from the rotating shaft. The second through pipe is arranged longitudinally. A third through pipe is provided below the first through pipe. One end of the third through pipe is connected to the bottom end of the second through pipe, and the other end of the third through pipe is connected to the discharge groove.

[0015] Preferably, the steam treatment assembly includes a top sleeve installed at the top of the exhaust pipe, a limiting groove is formed on the inner wall of the top sleeve, a connecting pipe is provided above the concentrator, one end of the connecting pipe is located inside the top sleeve, a limiting ring is installed at one end of the connecting pipe, the limiting ring is rotatably installed inside the top sleeve, and a treatment cylinder is installed at the other end of the connecting pipe.

[0016] Preferably, the processing cylinder has an inner tube installed inside, and a through groove is opened inside the inner tube. The top end of the through groove is connected to the connecting pipe, and the bottom end of the through groove extends to the bottom end of the inner tube. An inner groove is opened inside the inner tube. The inner groove is arranged in a ring shape and is not connected to the through groove. A water outlet groove is evenly opened at the bottom of the outer side of the inner groove. A water inlet pipe is installed on one side of the inner tube. One end of the water inlet pipe is connected to the inner groove, and the other end of the water inlet pipe is connected to a cooling water tank. A drain pipe is installed on one side of the processing cylinder. The drain pipe is located above the water outlet groove and below the water inlet pipe.

[0017] Preferably, a support plate is installed on the outer side of the inner tube, the support plate is located above the water outlet trough and above the drain pipe, a float is sleeved on the outer side of the inner tube, the outer wall of the float is in close contact with the inner wall of the concentration cylinder, the float is located above the support plate, a magnetic block is installed at the top of the float, an electromagnet is installed on the inner top wall of the concentration cylinder, and the magnetic block and the electromagnet are magnetically connected.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] (1) In this invention, when heating waste acid, the motor is turned on, the gear rotates, and the shaft rotates, so that the stirring blade rotates inside the waste acid to stir the waste acid, improve the heating uniformity, and facilitate the discharge of water vapor. When the shaft rotates, the fan blades rotate, thereby driving the gas in the concentration cylinder into the treatment cylinder, thereby facilitating the discharge of water vapor, increasing the discharge speed of water vapor in the waste acid, and improving the waste acid treatment efficiency. After the waste acid is concentrated, the concentrated sulfuric acid is reused in the acidolysis process of the titanium dioxide production line, saving production costs and improving resource utilization.

[0020] (2) In the process of steam discharge, the steam needs to pass through the first pipe, the second pipe and the third pipe. Since the first pipe, the second pipe and the third pipe are located outside the stirring blade, the stirring area is increased and the stirring effect is improved. At the same time, the steam re-enters below the surface of the waste liquid. The steam itself has a high temperature, which improves the heating effect on the waste liquid and further improves the waste acid treatment efficiency.

[0021] (3) The invention continuously introduces cold water into the treatment cylinder through the water inlet pipe, so that the cold water inside the treatment cylinder is always at a low temperature level, which facilitates the liquefaction of water vapor. At the same time, the cold water flows through the inner tank, which is located outside the through tank, thus facilitating the condensation of water vapor inside the through tank and improving the water vapor treatment efficiency. A float is provided above the cold water surface to effectively prevent water vapor from escaping and improve the water vapor treatment effect. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0023] In the attached diagram:

[0024] Figure 1 This is a schematic diagram of the titanium dioxide waste acid recycling equipment of the present invention;

[0025] Figure 2 This is a schematic diagram of the internal structure of the concentration cylinder of the present invention;

[0026] Figure 3 This is a schematic diagram of the waste liquid stirring assembly structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the water vapor discharge component structure of the present invention;

[0028] Figure 5 This is a schematic diagram of the water vapor treatment component structure of the present invention;

[0029] Figure 6 This is a schematic diagram of the internal structure of the processing cylinder of the present invention;

[0030] In the diagram: 1. Concentrator; 2. Inlet pipe; 3. Inlet valve; 4. Drain pipe; 5. Drain valve; 6. Heating coil; 7. Waste liquid stirring assembly; 701. Rotary tank; 702. Rotating shaft; 703. Stirring blade; 704. Limiting base plate; 705. Limiting top plate; 706. Top cylinder; 707. Gear ring; 708. Motor; 709. Gear; 8. Steam exhaust assembly; 801. Suction port; 802. First connecting groove; 803. First connecting pipe; 804. Second through pipe; 805, Third through pipe; 806, Discharge trough; 807, Fan blade; 808, Exhaust pipe; 9, Steam treatment assembly; 901, Treatment cylinder; 902, Connecting pipe; 903, Limiting ring; 904, Top sleeve; 905, Limiting groove; 906, Inner pipe; 907, Through groove; 908, Inner groove; 909, Water outlet trough; 910, Water inlet pipe; 911, Support plate; 912, Float; 913, Drain pipe; 914, Magnetic block; 915, Electromagnet. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] Example 1, by Figures 1-6 A method for recycling waste acid from titanium dioxide production lines for acidolysis is provided, comprising the following steps:

[0033] 1. Put the waste acid into the concentration device, open the liquid inlet valve 3, and let the waste acid into the concentration cylinder 1 from the liquid inlet pipe 2. Let cold water into the treatment cylinder 901 from the water inlet pipe 910 until the cold water level is below the float 912.

[0034] 2. The heating coil 6 is energized to heat the waste acid inside the concentration cylinder 1. The motor 708 is turned on, causing the rotating shaft 702 to rotate, thereby causing the stirring blade 703 to stir the waste acid and heat it evenly.

[0035] 3. After the waste acid is heated, water vapor is generated. When the rotating shaft 702 rotates, the fan blade 807 rotates, which drives the water vapor from the suction hole 801 into the first connecting groove 802. After flowing through the first connecting pipe 803, the second connecting pipe 804, the third connecting pipe 805 and the discharge groove 806, it enters the interior of the treatment cylinder 901 through the connecting pipe 902, etc., and liquefies upon contact with cold water.

[0036] 4. After the waste acid is concentrated to a sulfuric acid concentration of 50%, shut down the equipment, open the drain valve 5, and discharge the concentrated sulfuric acid from the drain pipe 4.

[0037] An acidolysis device for recycling waste acid from titanium dioxide production lines includes a concentration unit. The concentration unit includes a concentration cylinder 1. An inlet pipe 2 is installed at the top of one side of the concentration cylinder 1, and an inlet valve 3 is installed on the inlet pipe 2. A drain pipe 4 is installed at the bottom of one side of the concentration cylinder 1, and a heating coil 6 is installed on the drain pipe 4. A heating coil 6 is installed on the inner bottom wall of the concentration cylinder 1. A waste liquid stirring assembly 7 is installed on the concentration cylinder 1. The inlet pipe 2 is used for the inlet of waste acid, and the drain pipe 4 is used for the discharge of concentrated sulfuric acid. The heating coil 6 is used to heat and concentrate the waste acid inside the concentration cylinder 1. All surfaces of the equipment that come into contact with waste acid are coated with Solvay heavy-duty anti-corrosion coating to prevent the equipment from being corroded by sulfuric acid.

[0038] The waste liquid stirring assembly 7 includes a rotating trough 701 located at the top of the concentration cylinder 1. A rotating shaft 702 is rotatably mounted inside the rotating trough 701. Stirring blades 703 are evenly mounted on the outer side of the rotating shaft 702, located inside the waste acid. A limiting base plate 704 is mounted on the rotating shaft 702, contacting the inner top wall of the concentration cylinder 1. A limiting top plate 705 is mounted at the top of the rotating shaft 702, with its bottom end contacting the top wall of the concentration cylinder 1. A top cylinder 706 is mounted at the top of the limiting top plate 705. A gear ring 707 is mounted on the outer wall of the top cylinder 706. A motor 708 is meshed with one side of the gear ring 707. The motor 708 is fixedly connected to the output shaft of a gear 709. Wheel 709 is fixedly installed on the top of the concentration cylinder 1. A steam discharge assembly 8 is installed on the rotating shaft 702. When heating waste acid, the motor 708 is turned on, causing the gear 709 to rotate. This drives the rotating shaft 702 to rotate, causing the stirring blade 703 to rotate inside the waste acid, stirring the waste acid and improving the heating uniformity. At the same time, it facilitates the discharge of steam. When the rotating shaft 702 rotates, the fan blade 807 rotates, thereby driving the gas in the concentration cylinder 1 into the treatment cylinder 901, which facilitates the discharge of steam, increases the steam discharge speed in the waste acid, and improves the waste acid treatment efficiency. After the waste acid is concentrated, the concentrated sulfuric acid is recycled to the acidolysis process of the titanium dioxide production line, saving production costs and improving resource utilization.

[0039] The steam discharge assembly 8 includes a first connecting groove 802 formed inside the rotating shaft 702. The first connecting groove 802 is annular, and suction holes 801 are evenly distributed on the outer side of the first connecting groove 802, penetrating into the interior of the concentration cylinder 1. The suction holes 801 are located above the waste acid liquid surface. A discharge groove 806 is formed inside the rotating shaft 702. The bottom end of the discharge groove 806 is below the waste acid liquid surface, and the top end of the discharge groove 806 penetrates into the interior of the top cylinder 706. Fan blades 807 are installed at equal angles on the inner wall of the top cylinder 706. The fan blades 807 are inclined. An exhaust pipe 808 is installed at the top of the top cylinder 706. A steam treatment assembly 9 is installed at the end of the exhaust pipe 808 away from the top cylinder 706. A first through pipe 803 is installed at equal angles on the outer side of the rotating shaft 702. One end of the first through pipe 803... The first connecting pipe 803 is connected to the interior of the first connecting groove 802. A second connecting pipe 804 is installed at the end of the first connecting pipe 803 away from the rotating shaft 702. The second connecting pipe 804 is arranged longitudinally. A third connecting pipe 805 is provided below the first connecting pipe 803. One end of the third connecting pipe 805 is connected to the bottom end of the second connecting pipe 804, and the other end of the third connecting pipe 805 is connected to the discharge groove 806. During the steam discharge process, the steam needs to pass through the first connecting pipe 803, the second connecting pipe 804, and the third connecting pipe 805. Since the first connecting pipe 803, the second connecting pipe 804, and the third connecting pipe 805 are located outside the stirring blade 703, the stirring area is increased and the stirring effect is improved. At the same time, the steam re-enters below the surface of the waste liquid. Since the steam itself is at a high temperature, it improves the heating effect on the waste liquid and further improves the waste acid treatment efficiency.

[0040] The steam treatment assembly 9 includes a top sleeve 904 installed at the top of the exhaust pipe 808. A limiting groove 905 is formed on the inner wall of the top sleeve 904. A connecting pipe 902 is provided above the concentrator 1. One end of the connecting pipe 902 is located inside the top sleeve 904, and a limiting ring 903 is installed at one end of the connecting pipe 902. The limiting ring 903 is rotatably installed inside the top sleeve 904. A treatment cylinder 901 is installed at the other end of the connecting pipe 902. An inner tube 906 is installed inside the treatment cylinder 901, and a passage is formed inside the inner tube 906. The top of the through groove 907 is connected to the connecting pipe 902, and the bottom of the through groove 907 extends to the bottom of the inner pipe 906. An inner groove 908 is formed inside the inner pipe 906, and the inner groove 908 is not connected to the through groove 907. Water outlet grooves 909 are evenly distributed at the bottom outer side of the inner groove 908. A water inlet pipe 910 is installed on one side of the inner pipe 906, with one end connected to the inner groove 908 and the other end connected to a cooling water tank. One side of the treatment cylinder 901... A drain pipe 913 is installed above the outlet tank 909 and below the inlet pipe 910. A support plate 911 is installed on the outside of the inner pipe 906, above the outlet tank 909 and above the drain pipe 913. A float 912 is sleeved on the outside of the inner pipe 906, with its outer wall in close contact with the inner wall of the concentration cylinder 1. The float 912 is located above the support plate 911, and a magnetic block 914 is installed at the top of the float 912. An electromagnet 915 is installed on the top wall, and a magnetic block 914 is magnetically connected to the electromagnet 915. The water inlet pipe 910 continuously supplies cold water to the treatment cylinder 901, keeping the cold water inside the treatment cylinder 901 at a low temperature, which facilitates the liquefaction of water vapor. At the same time, the cold water flows through the inner tank 908, which is located outside the through groove 907, thus facilitating the condensation of water vapor inside the through groove 907 and improving the water vapor treatment efficiency. A float 912 is installed above the cold water surface to effectively prevent water vapor from escaping and improve the water vapor treatment effect.

[0041] Working principle: When in use, open the liquid inlet valve 3 and let the waste acid to be treated enter the inside of the concentration cylinder 1 through the liquid inlet pipe 2. Close the liquid inlet valve 3, energize the heating coil 6 to heat the waste acid inside the concentration cylinder 1, turn on the motor 708 to make the gear 709 rotate. Since the motor 708 and the gear ring 707 mesh with each other, they drive the rotating shaft 702 to rotate, which makes the stirring blade 703 stir the waste acid, thereby making the waste acid heat evenly and improving the concentration efficiency.

[0042] After heating, the water in the waste acid is heated into water vapor and enters above the liquid surface. As the rotating shaft 702 rotates, it drives the fan blades 807 inside the top cylinder 706 to rotate. The fan blades 807 are set at an angle, thereby continuously driving gas from the discharge tank 806 into the exhaust pipe 808. This causes the water vapor in the concentration cylinder 1 to enter the first connecting tank 802 through the air intake hole 801, and then enter the discharge tank 806 through the first connecting pipe 803, the second connecting pipe 804, and the third connecting pipe 805, and finally exit from the exhaust pipe 808. Since the first connecting pipe 803, the second connecting pipe 804, and the third connecting pipe 805 are located outside the stirring blade 703, the stirring area is increased, and the stirring effect is improved. At the same time, the high-temperature water vapor passes through the first connecting pipe 803, the second connecting pipe 804, and the third connecting pipe 805, and the first connecting pipe 803, the second connecting pipe 804, and the third connecting pipe 805 are in contact with the waste liquid, thereby improving the heating effect on the waste liquid and improving the concentration efficiency.

[0043] Water vapor enters the processing cylinder 901 through the connecting pipe 902 from the exhaust pipe 808. Before processing, cold water is introduced from the water inlet pipe 910. The cold water enters the inner tank 908 and enters the concentrator 1 from the water outlet tank 909 until the liquid level reaches above the water outlet tank 909. Water vapor enters the cold water from the bottom of the through tank 907 and liquefies. At the same time, cold water continuously enters the concentrator 1 from the water inlet pipe 910 through the inner tank 908, keeping the cold water temperature at a low level to facilitate the treatment of water vapor. In addition, the inner tank 908 is located outside the through tank 907, which facilitates the condensation of water vapor entering the through tank 907 and improves the water vapor treatment efficiency.

[0044] As the amount of cold water in the concentration tank 1 increases, the rising liquid level pushes the float 912 upward. When the liquid level reaches the same height as the drain pipe 913, the cold water is discharged from the drain pipe 913. Meanwhile, the magnetic block 914 moves with the liquid level in the treatment tank 901, thus preventing water vapor from escaping, facilitating the liquefaction of water vapor, and making it convenient to use. When it is necessary to extract the cold water, the electromagnet 915 is turned on, which attracts the magnetic block 914, causing the float 912 to move upward away from the liquid level, and the water pump enters the concentration tank 1 from the drain pipe 913 to extract the water.

[0045] When the concentration of waste acid in the concentration tank 1 reaches 50%, the equipment is shut down, the drain valve 5 is opened, the condensed sulfuric acid in the concentration tank 1 is discharged and reused in the acidolysis process of the titanium dioxide production line.

Claims

1. An acidolysis device for recycling waste acid from titanium dioxide production lines, comprising a concentration unit, characterized in that: The concentration device includes a concentration cylinder (1), an inlet pipe (2) installed at the top of one side of the concentration cylinder (1), an inlet valve (3) installed on the inlet pipe (2), a drain pipe (4) installed at the bottom of one side of the concentration cylinder (1), a heating coil (6) installed on the drain pipe (4), a heating coil (6) installed on the inner bottom wall of the concentration cylinder (1), and a waste liquid stirring assembly (7) installed on the concentration cylinder (1). The waste liquid stirring assembly (7) includes a rotating trough (701) opened at the top of the concentration cylinder (1), a rotating shaft (702) is rotatably installed inside the rotating trough (701), stirring blades (703) are evenly installed on the outside of the rotating shaft (702), the stirring blades (703) are located inside the waste acid, a limiting base plate (704) is installed on the rotating shaft (702), the limiting base plate (704) is in contact with the inner top wall of the concentration cylinder (1), and a limiting top plate (705) is installed at the top of the rotating shaft (702). The bottom end of the limiting top plate (705) contacts the top wall of the concentrator (1). A top cylinder (706) is installed on the top of the limiting top plate (705). A gear ring (707) is installed on the outer wall of the top cylinder (706). A motor (708) is meshed with one side of the gear ring (707). The output shaft of the motor (708) is fixedly connected to the output shaft of the gear (709). The gear (709) is fixedly installed on the top of the concentrator (1). A steam discharge assembly (8) is installed on the rotating shaft (702). The steam discharge assembly (8) includes a first connecting groove (802) opened inside the rotating shaft (702). The first connecting groove (802) is arranged in a ring shape. Suction holes (801) are evenly opened on the outer side of the first connecting groove (802). The suction holes (801) penetrate into the interior of the concentration cylinder (1). The suction holes (801) are located above the waste acid liquid surface. A discharge groove (806) is opened inside the rotating shaft (702). The bottom end of the discharge groove (806) is located below the waste acid liquid surface. The top end of the discharge groove (806) penetrates into the interior of the top cylinder (706). Fan blades (807) are installed at equal angles on the inner wall of the top cylinder (706). The fan blades (807) are inclined. An exhaust pipe (808) is installed at the top. A steam treatment component (9) is installed at the end of the exhaust pipe (808) away from the top cylinder (706). A first through pipe (803) is installed at an equal angle on the outside of the rotating shaft (702). One end of the first through pipe (803) is connected to the inside of the first connecting groove (802). A second through pipe (804) is installed at the end of the first through pipe (803) away from the rotating shaft (702). The second through pipe (804) is arranged longitudinally. A third through pipe (805) is provided below the first through pipe (803). One end of the third through pipe (805) is connected to the bottom end of the second through pipe (804). The other end of the third through pipe (805) is connected to the discharge groove (806). The steam treatment assembly (9) includes a top sleeve (904) installed at the top of the exhaust pipe (808). A limiting groove (905) is formed on the inner wall of the top sleeve (904). A connecting pipe (902) is provided above the concentrator (1). One end of the connecting pipe (902) is located inside the top sleeve (904). A limiting ring (903) is installed at one end of the connecting pipe (902). The limiting ring (903) is rotatably installed inside the top sleeve (904). A treatment cylinder is installed at the other end of the connecting pipe (902). (901) An inner tube (906) is installed inside the processing cylinder (901). A through groove (907) is opened inside the inner tube (906). The top end of the through groove (907) is connected to the connecting pipe (902). The bottom end of the through groove (907) extends to the bottom end of the inner tube (906). An inner groove (908) is opened inside the inner tube (906). The inner groove (908) is arranged in a ring shape. The inner groove (908) is not connected to the through groove (907). An outlet is evenly opened on the bottom outer side of the inner groove (908). A water tank (909) has an inlet pipe (910) installed on one side of the inner tube (906). One end of the inlet pipe (910) is connected to the inner tank (908), and the other end of the inlet pipe (910) is connected to a cooling water tank. A drain pipe (913) is installed on one side of the treatment cylinder (901). The drain pipe (913) is located above the outlet tank (909) and below the inlet pipe (910). A support plate (911) is installed on the outer side of the inner tube (906). 11) Located above the outlet tank (909), the tray (911) is located above the drain pipe (913). A float (912) is sleeved on the outside of the inner pipe (906). The outer wall of the float (912) is in close contact with the inner wall of the concentration cylinder (1). The float (912) is located above the tray (911). A magnet (914) is installed on the top of the float (912). An electromagnet (915) is installed on the inner top wall of the concentration cylinder (1). The magnet (914) and the electromagnet (915) are magnetically connected.

2. A method for recycling waste acid from titanium dioxide production lines for acidolysis, using the equipment described in claim 1, comprising the following steps:

1. Put the waste acid into the concentration device, open the liquid inlet valve (3), and let the waste acid into the concentration cylinder (1) from the liquid inlet pipe (2). Let cold water into the treatment cylinder (901) from the water inlet pipe (910) until the cold water level is below the float (912).

2. The heating coil (6) is energized to heat the waste acid inside the concentration cylinder (1), and the motor (708) is turned on to make the rotating shaft (702) rotate, thereby making the stirring blade (703) stir the waste acid and heat the waste acid evenly.

3. After the waste acid is heated, water vapor is generated. When the shaft (702) rotates, the fan blades (807) rotate, which drives the water vapor to enter the first connecting groove (802) through the suction hole (801). After flowing through the first connecting pipe (803), the second connecting pipe (804), the third connecting pipe (805) and the discharge groove (806), the water vapor enters the interior of the treatment cylinder (901) through the connecting pipe (902) and liquefies upon contact with cold water.

4. After the waste acid is concentrated to a sulfuric acid concentration of 50%, shut down the equipment, open the drain valve (5), and discharge the concentrated sulfuric acid from the drain pipe (4).

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