Polymeric ferric chloride waste acid regeneration electrolytic cell

Abstract

The utility model relates to the technical field of electrolytic cell discloses a kind of polymeric ferric chloride waste acid regeneration electrolytic cell, including tank body, the bottom of tank body is set to V type, the inside one side of tank body is fixed with anode, the inside other side of tank body is slidably equipped with cathode, the top of tank body is fixed with top cover, and sealing structure is equipped at the contact place of top cover and tank body, the top of cathode is fixed with the guide rod of sliding connection with top cover, the top of guide rod is fixed with connecting plate, the top of connecting plate is fixed with transmission gear plate;The utility model is driven cathode vertical lifting by the meshing mechanism of transmission gear and gear plate, when cathode is lifted and leaves liquid surface, the loose scale layer attached to its surface under the triple effect of gravity effect, water evaporation shrinkage and the slight vibration generated by lifting action is automatically cracked, stripped and falls off.

Description

Technical Field

[0001] This utility model relates to the field of electrolytic cell technology, specifically a polyferric chloride waste acid regeneration electrolytic cell. Background Technology

[0002] Polyferric chloride (PFCC), a highly efficient inorganic polymeric flocculant, is widely used in water treatment. Its production process typically involves the reaction of iron-rich raw materials (such as iron filings and iron ore) with hydrochloric acid, a process that generates a large amount of... Acidic waste liquid (waste acid) containing heavy metal impurities. These waste acids are highly corrosive and contain heavy metals. Direct discharge or simple neutralization treatment not only wastes resources (acid and iron) but also causes secondary environmental pollution (such as generating a large amount of sludge containing heavy metals) and high treatment costs. Electrolytic regeneration technology is considered one of the effective ways to treat such waste acids and achieve resource recovery (regenerated acid and recovered iron). However, existing electrolytic cells for the regeneration of polyferric chloride waste acid still have the following defects in actual operation: severe cathode scaling and difficulty in cleaning. During the electrolysis process, iron deposition, hydroxide generation and subsequent polymerization reactions inevitably occur on the cathode surface, forming a loose but firmly attached scale layer. As the operating time increases, this scale layer continues to thicken, resulting in a reduction in the effective cathode area, an increase in resistance, an increase in cell voltage, a significant decrease in current efficiency, and a sharp increase in energy consumption. The traditional fixed or simple suspended cathode design makes it extremely difficult to clean these scales, usually requiring frequent shutdowns to disassemble the cathode for manual scraping or chemical cleaning. Utility Model Content

[0003] The purpose of this invention is to provide a polyferric chloride waste acid regeneration electrolytic cell with the effect of automatic removal and efficient collection of cathode scale.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a polyferric chloride waste acid regeneration electrolytic cell, comprising a cell body, the bottom of the cell body being V-shaped, an anode being fixedly provided on one side of the cell body, a cathode being slidably provided on the other side of the cell body, a top cover being fixedly provided on the top of the cell body, and a sealing structure being provided at the contact point between the top cover and the cell body, a guide rod being fixedly provided on the top of the cathode and slidably connected to the top cover, a connecting plate being fixedly provided on the top of the guide rod, a transmission gear plate being fixedly provided on the top of the connecting plate, a mounting seat being fixedly provided on the top of the top cover, and a transmission gear being rotatably provided on the top of the mounting seat and meshing with the transmission gear plate.

[0005] A further feature of this invention is that: a support leg is fixedly provided at the bottom of the tank, a slag discharge pipe is provided at the bottom of one side of the tank, a sealing cap is threaded at the end of the slag discharge pipe, and a guide seat inclined toward the slag discharge pipe is provided at the bottom inside the tank.

[0006] A further feature of this invention is that an outlet pipe is fixedly provided on the top of one side of the tank, and an inlet pipe is fixedly provided on the top of the other side of the tank, and control valves are provided on the surfaces of the outlet pipe and the inlet pipe.

[0007] A further feature of this invention is that an exhaust pipe is fixedly provided on one side of the top of the top cover, a control valve is provided on the surface of the exhaust pipe, and a guide rib is fixedly provided at the bottom of the top cover.

[0008] A further feature of this invention is that the sealing structure includes a liquid seal groove and a sealing protrusion. The liquid seal groove is disposed at the top of the groove body, and the sealing protrusion is fixedly disposed at the bottom of the top cover, and the sealing protrusion engages with the liquid seal groove.

[0009] A further feature of this invention is that a lower mounting plate is fixedly provided at the top of the groove, and an upper mounting plate is fixedly provided at the bottom of the top cover. The upper mounting plate and the lower mounting plate are connected by fixing bolts, and a sealing ring is embedded on the upper surface of the lower mounting plate and the lower surface of the upper mounting plate.

[0010] A further feature of this invention is that limiting seats are fixedly provided on the inner walls of both sides of the tank to support the cathode.

[0011] A further feature of this invention is that: a mounting shaft is rotatably provided on the top of the mounting base, the transmission gear is fixedly installed in the middle of the mounting shaft, and rotating wheels are fixedly provided at both ends of the mounting shaft.

[0012] In summary, this utility model has the following beneficial effects: It achieves highly efficient automatic removal and collection of cathode scale. Through the meshing mechanism of the transmission gear and toothed plate, the cathode is driven to rise and fall vertically. When the cathode is lifted off the liquid surface, the loose scale layer adhering to its surface automatically cracks, peels off, and falls off under the triple effects of gravity, water evaporation and contraction, and the slight vibration generated by the lifting action. Combined with the unique V-shaped structure at the bottom of the tank and the inclined guide seat design, the detached scale can be quickly collected at the bottom slag discharge pipe, achieving automatic cleaning and high efficiency of scale removal. This system effectively collects and completely avoids the downtime losses, high labor intensity, and safety hazards caused by traditional manual cleaning. It adopts a liquid seal structure, where the top cover sealing protrusion engages with the liquid seal groove of the tank. The tank is filled with acid-resistant liquid to form a liquid seal barrier, ensuring that acid mist cannot escape from the joint between the top cover and the tank. The upper and lower mounting plates are tightened with bolts and fitted with sealing rings to further enhance the overall sealing performance. This system curbs the escape of acid mist (especially HCl-containing gas) and hydrogen from the source, ensuring a safe operating environment, reducing acid component loss, and lowering the exhaust gas treatment load. Attached Figure Description

[0013] Figure 1This is one of the three-dimensional structural schematic diagrams of this utility model; Figure 2 This is the second three-dimensional structural schematic diagram of the present invention; Figure 3 This is a cross-sectional structural diagram of the present invention; Figure 4 This is one of the exploded structural diagrams of this utility model; Figure 5 This is the second schematic diagram of the exploded structure of this utility model; Figure 6 This is a schematic diagram of the structure of the cathode of this utility model.

[0014] In the diagram: 1. Tank body; 101. Support leg; 102. Slag discharge pipe; 103. Liquid inlet pipe; 104. Liquid outlet pipe; 105. Liquid seal tank; 106. Lower mounting plate; 2. Top cover; 201. Exhaust pipe; 202. Upper mounting plate; 203. Fixing bolt; 204. Sealing protrusion; 205. Guide rib; 3. Anode; 4. Cathode; 401. Limit seat; 402. Guide rod; 403. Connecting plate; 404. Transmission gear plate; 5. Mounting seat; 501. Mounting shaft; 502. Transmission gear; 503. Rotary wheel. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings of the embodiments thereof.

[0016] Please see Figures 1-6In this embodiment of the present invention, a polyferric chloride waste acid regeneration electrolytic cell includes a tank body 1. The bottom of the tank body 1 is V-shaped to facilitate the collection of dirt. An anode 3 is fixedly installed on one side of the tank body 1, using an inert anode such as titanium-based ruthenium-iridium oxide, platinum, or graphite plate. A cathode 4 is slidably installed on the other side of the tank body 1, using an acid-resistant metal cathode such as Hastelloy, titanium, or surface-treated low-carbon steel. Guide holes are provided on the surfaces of the anode 3 and the cathode 4. A top cover 2 is fixedly installed at the top of the tank body 1, and a sealing structure is provided at the contact point between the top cover 2 and the tank body 1. A guide rod 402 is fixedly installed at the top of the cathode 4 and slidably connected to the top cover 2. A guide tube is provided on the surface of the top cover 2 and slidably connected to the guide rod 402. A sealing O-ring is provided on the inner wall of the tube to prevent acid mist leakage. A connecting plate 403 is fixedly provided at the top of the guide rod 402. A transmission gear plate 404 is fixedly provided at the top of the connecting plate 403. A mounting seat 5 is fixedly provided at the top of the top cover 2. A transmission gear 502 is rotatably provided on the top of the mounting seat 5 and meshes with the transmission gear plate 404. When the transmission gear 502 rotates, it can drive the connecting plate 403 to move upward under its meshing with the transmission gear plate 404, thereby driving the cathode 4 to move upward. When the cathode 4 is lifted away from the liquid surface to a certain height, the loose scale layer attached to the cathode 4 will automatically crack, peel off and fall off due to gravity, water evaporation and shrinkage and slight vibration of the lifting action itself, and fall into the V-shaped groove at the bottom of the tank 1.

[0017] In this embodiment, preferably, a support leg 101 is fixedly provided at the bottom of the tank body 1 to provide stable support for the tank body 1. A slag discharge pipe 102 is provided at the bottom of one side of the tank body 1. A sealing cap is threaded at the end of the slag discharge pipe 102. A guide seat inclined towards the slag discharge pipe 102 is provided at the bottom inside the tank body 1 to guide the flow so that the dirt at the bottom of the tank body 1 can be discharged through the slag discharge pipe 102. In this embodiment, preferably, an outlet pipe 104 is fixedly provided on the top of one side of the tank body 1, and an inlet pipe 103 is fixedly provided on the top of the other side of the tank body 1. Furthermore, control valves are provided on the surfaces of the outlet pipe 104 and the inlet pipe 103 to control the opening and closing of the inlet pipe 103 and the outlet pipe 104. In this embodiment, preferably, an exhaust pipe 201 is fixedly provided on one side of the top of the top cover 2. The surface of the exhaust pipe 201 is provided with a control valve. The exhaust pipe 201 leads out the mixed gas collected below the top cover 2, which is mainly H2 generated by the cathode 4 and a small amount of acid mist HCl. It can lead to the absorption tower to treat the acid mist and recover dilute acid or hydrogen for use in the emission system. The bottom end of the top cover 2 is fixedly provided with a guide rib 205, which guides the gas so that it can be discharged into the exhaust pipe 201. In this embodiment, preferably, the sealing structure includes a liquid seal groove 105 and a sealing protrusion 204. The liquid seal groove 105 is disposed at the top of the groove body 1, and the sealing protrusion 204 is fixedly disposed at the bottom of the top cover 2. The sealing protrusion 204 engages with the liquid seal groove 105. A certain height of acid-resistant liquid is filled inside the liquid seal groove 105 to form a liquid seal, and the liquid level always submerges the bottom of the sealing protrusion 204, effectively preventing acid mist from escaping. In this embodiment, preferably, a lower mounting plate 106 is fixedly provided at the top of the groove 1, and an upper mounting plate 202 is fixedly provided at the bottom of the top cover 2. The upper mounting plate 202 and the lower mounting plate 106 are connected by fixing bolts 203. A sealing ring is embedded on the upper surface of the lower mounting plate 106 and the lower surface of the upper mounting plate 202 as an auxiliary seal to further improve the sealing performance. In this embodiment, preferably, the inner walls on both sides of the tank 1 are fixedly provided with limiting seats 401 to support the cathode 4 and to limit the cathode 4 when it moves down to the lowest end, preventing the cathode 4 from moving further downward. In this embodiment, preferably, the top of the mounting base 5 is rotatably provided with a mounting shaft 501, the transmission gear 502 is fixedly installed in the middle of the mounting shaft 501, and both ends of the mounting shaft 501 are fixedly provided with rotating wheels 503. The rotating wheels 503 can drive the mounting shaft 501 to rotate, thereby driving the transmission gear 502 to rotate.

[0018] During use, waste acid is injected into tank 1 through inlet pipe 103, with the liquid level between the lowest and highest positions of cathode 4. After energization, an oxidation reaction occurs on the surface of inert anode 3 (such as titanium-based ruthenium-iridium oxide, platinum, or graphite plate). Oxidized to The reaction occurs on the surface of the acid-resistant metal cathode 4 (such as Hastelloy, titanium, or surface-treated low-carbon steel) where hydrogen evolution occurs. and some During hydrolysis and polymerization, as electrolysis proceeds, a loose layer of iron compound (hydroxide / basic ferric chloride) scale gradually forms on the surface of cathode 4. When the scale on the surface of cathode 4 reaches a certain thickness, the operator rotates the wheel 503 on the mounting base 5, driving the mounting shaft 501 and the transmission gear 502 fixed thereon to rotate. The transmission gear 502 meshes with the transmission gear plate 404 fixed at the top of cathode 4, converting the rotational motion into linear lifting motion. Through the transmission of the connecting plate 403 and the guide rod 402, cathode 4 slides vertically upward along the support surface of the limiting seat 401, eventually lifting off the liquid surface to the predetermined height. During the lifting process and when the cathode 4 is suspended, when cathode 4 is lifted off the liquid surface, the loose scale layer attached to its surface automatically cracks, peels off, and falls off under the triple effects of gravity, water evaporation and shrinkage, and the slight vibration generated by the lifting action. Combined with the unique V-shaped structure at the bottom of the tank 1 and the inclined guide seat design, the scale layer falls off. Scale can quickly collect at the bottom slag discharge pipe 102. The sealing cap at the end of the slag discharge pipe 102 is opened periodically, and the scale is discharged under gravity. The operation is simple and leaves little residue. Hydrogen and acid mist (HCl gas) generated by electrolysis accumulate in the upper part of the tank 1. The guide rib 205 guides the gas flow to the exhaust pipe 201 at the top of the top cover 2. The discharge is regulated by the control valve to the external treatment system (such as an absorption tower or hydrogen utilization device). The liquid seal tank 105 at the top of the tank 1 is filled with acid-resistant liquid. The sealing protrusion 204 at the bottom of the top cover 2 is immersed in it to form an airtight barrier. The upper mounting plate 202 and the lower mounting plate 106 are pressed together by the fixing bolts 203. The embedded sealing ring further enhances the sealing reliability. After descaling is completed, the rotor 503 is rotated in the opposite direction to make the cathode 4 descend and reset to the limit seat 401. Electrolysis continues. The regenerated liquid can be discharged through the liquid outlet pipe 104. At the same time, new waste acid is added to achieve continuous or batch operation.

[0019] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A polyferric chloride waste acid regeneration electrolytic cell, comprising a cell body (1), characterized in that, The bottom of the tank (1) is V-shaped. An anode (3) is fixedly provided on one side of the tank (1), and a cathode (4) is slidably provided on the other side of the tank (1). A top cover (2) is fixedly provided at the top of the tank (1), and a sealing structure is provided at the contact point between the top cover (2) and the tank (1). A guide rod (402) is fixedly provided at the top of the cathode (4) and slidably connected to the top cover (2). A connecting plate (403) is fixedly provided at the top of the guide rod (402). A transmission gear plate (404) is fixedly provided at the top of the connecting plate (403). A mounting seat (5) is fixedly provided at the top of the top cover (2). A transmission gear (502) is rotatably provided on the top of the mounting seat (5) and meshes with the transmission gear plate (404).

2. The polyferric chloride waste acid regeneration electrolytic cell according to claim 1, characterized in that: The bottom of the tank (1) is fixedly provided with a support leg (101), and a slag discharge pipe (102) is provided at the bottom of one side of the tank (1). The end of the slag discharge pipe (102) is threaded with a sealing cap, and a guide seat inclined towards the slag discharge pipe (102) is provided at the bottom inside the tank (1).

3. The polyferric chloride waste acid regeneration electrolytic cell according to claim 1, characterized in that: A liquid outlet pipe (104) is fixedly provided on the top of one side of the tank (1), and a liquid inlet pipe (103) is fixedly provided on the top of the other side of the tank (1). Control valves are provided on the surfaces of the liquid outlet pipe (104) and the liquid inlet pipe (103).

4. The polyferric chloride waste acid regeneration electrolytic cell according to claim 1, characterized in that: An exhaust pipe (201) is fixedly provided on one side of the top of the top cover (2), and a control valve is provided on the surface of the exhaust pipe (201). A guide rib (205) is fixedly provided at the bottom of the top cover (2).

5. The polyferric chloride waste acid regeneration electrolytic cell according to claim 1, characterized in that: The sealing structure includes a liquid seal groove (105) and a sealing protrusion (204). The liquid seal groove (105) is located at the top of the groove body (1), and the sealing protrusion (204) is fixedly located at the bottom of the top cover (2). The sealing protrusion (204) engages with the liquid seal groove (105).

6. The polyferric chloride waste acid regeneration electrolytic cell according to claim 5, characterized in that: The top of the groove (1) is fixedly provided with a lower mounting plate (106), and the bottom of the top cover (2) is fixedly provided with an upper mounting plate (202). The upper mounting plate (202) and the lower mounting plate (106) are connected by fixing bolts (203). The upper surface of the lower mounting plate (106) and the lower surface of the upper mounting plate (202) are both provided with sealing rings.

7. The polyferric chloride waste acid regeneration electrolytic cell according to claim 1, characterized in that: The inner walls on both sides of the tank (1) are fixed with limiting seats (401) to support the cathode (4).

8. The polyferric chloride waste acid regeneration electrolytic cell according to claim 1, characterized in that: The top of the mounting base (5) is rotatably provided with a mounting shaft (501), the transmission gear (502) is fixedly installed in the middle of the mounting shaft (501), and both ends of the mounting shaft (501) are fixedly provided with rotating wheels (503).

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