Acid liquid feed make-up device

Abstract

The utility model relates to electrolytic workshop acid liquid supplement technical field, concretely is acid liquid feed supplement device. The acid liquid feed supplement device, including concentrated acid jar, concentrated acid jar is connected with filter through dilution mixer, filter is connected with electrolytic cell through flowmeter, and the filter is connected with the flush liquid storage tank, and the outside of electrolytic cell is equipped with electrolytic cell temperature control cover, and the heat exchanger is connected on electrolytic cell temperature control cover. The device can actively remove the deposited impurities below the filter plate through the setting rotary scraping plate and filter plate cooperation, reduces filter cake formation, and at the same time, the waste heat of dilution mixer is used to heat backwashing liquid, the flowability and impact force of backwashing water are improved, the stubborn impurities removal effect is enhanced, and the filter plugging frequency is reduced.

Description

Technical Field

[0001] This utility model relates to the field of acid replenishment technology in electrolysis workshops, specifically to an acid feeding and replenishment device. Background Technology

[0002] Electrolysis workshops are the core locations for metal refining (electrolytic copper, electrolytic zinc), electroplating, or chemical product production (such as in the chlor-alkali industry) through electrolytic reactions. The production process requires maintaining stable key parameters such as the concentration and pH value of the electrolyte within the electrolytic cells. Therefore, it is necessary to periodically replenish the electrolytic cells with acid (sulfuric acid, hydrochloric acid, etc.). The stable operation of the acid replenishment system directly affects electrolysis efficiency and product quality, with filters and concentrated acid storage being two crucial aspects.

[0003] Existing acid feed replenishment devices have several problems. Impurities in the acid (metal oxides, crystalline particles) easily deposit on the filter surface, forming a filter cake. Especially at low temperatures, the impurities become more viscous and harder to remove through backwashing, leading to decreased filtration efficiency and frequent shutdowns for cleaning. Concentrated acid is also prone to crystallization at low temperatures (concentrated sulfuric acid crystallizes at approximately 10°C), affecting the smoothness of the feed. Although existing technologies utilize the residual heat from acid dilution to keep the concentrated acid tank warm, the dilution process is intermittent (1-2 times per day), which cannot continuously provide heat, and there is still a risk of crystallization at low temperatures. The dilution process of concentrated sulfuric acid releases a large amount of heat, which is not fully recovered and utilized in existing technologies. Backwashing often uses room temperature water, which has limited effect on cleaning stubborn filter cakes and further exacerbates filter clogging. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide an acid feed replenishment device. By setting a rotating scraper plate to cooperate with the filter plate, it can actively remove the deposited impurities under the filter plate and reduce the formation of filter cake. At the same time, it uses the waste heat of the dilution mixer to heat the backwash liquid, improve the fluidity and impact force of the backwash water, enhance the removal effect on stubborn impurities, and reduce the frequency of filter clogging.

[0005] This utility model is achieved using the following technical solution: The acid feed replenishment device includes a concentrated acid tank, which is connected to a filter via a dilution mixer. The filter is connected to an electrolytic cell via a flow meter. A rinsing liquid storage tank is connected to the filter. An electrolytic cell temperature control sleeve is provided on the outside of the electrolytic cell, and a heat exchanger is connected to the electrolytic cell temperature control sleeve.

[0006] The concentrated acid tank has an internal stirring paddle driven by a drive motor, and an external insulation sleeve connected to a heat exchanger. The stirring paddle ensures uniform temperature of the concentrated acid, preventing localized crystallization; the insulation sleeve continuously introduces waste heat from the electrolytic cell through the heat exchanger, achieving 24-hour constant temperature maintenance and completely solving the problem of low-temperature crystallization.

[0007] The concentrated acid tank is equipped with an internal stirring paddle driven by a drive motor, and an external insulation sleeve is provided on the outside of the concentrated acid tank. A magnetic pump and a safety valve are provided between the mixer and the filter.

[0008] The dilution mixer is equipped with a dilution mixer impeller inside, a dilution mixer coil is provided on the outside of the dilution mixer impeller, and a diluent inlet is provided above the dilution mixer.

[0009] The flushing fluid storage tank is equipped with a flushing fluid storage tank coil inside. The dilution mixer coil is connected to the flushing fluid storage tank coil through a pipe. The flushing fluid storage tank is connected to the top of the filter.

[0010] The filter contains a filter plate inside, with a rotating scraper located below the filter plate. The upper edge of the rotating scraper is tangent to the lower edge of the filter plate. The filter has a built-in filter plate, a rotating scraper below it (with its edge tangent to the lower edge of the filter plate), and a flushing fluid storage tank connected to the top. The filter plate intercepts impurities, while the rotating scraper actively removes deposited impurities. Combined with hot water backwashing, this significantly reduces the frequency of clogging. Acid flows in from below the filter plate and out from above, preventing secondary contamination from impurities.

[0011] The dilution mixer is connected to the filter via a pipe located below the filter plate, while the electrolytic cell is connected to the filter via a pipe located above the filter plate.

[0012] A flow meter is installed between the filter and the electrolytic cell, and the heat exchanger is connected to the insulation jacket of the concentrated acid tank through a pipe.

[0013] The working principle of this utility model is as follows: Concentrated acid storage and insulation: Concentrated acid (98% concentrated sulfuric acid) is stored in a concentrated acid tank. The outer insulation jacket of the concentrated acid tank is connected to a heat exchanger via pipes. The heat exchanger absorbs the waste heat from the electrolytic cell (temperature 50-80℃) to continuously heat the concentrated acid tank, maintaining the internal temperature at 15-30℃ to prevent crystallization. Start the agitator in the concentrated acid tank and stir at a speed of 100-200 rpm to ensure uniform temperature of the concentrated acid.

[0014] Acid dilution and waste heat recovery: Concentrated acid enters the dilution mixer through a pipeline, while diluent (such as water) is added from the diluent inlet. The dilution ratio is adjusted according to process requirements (e.g., diluting 98% concentrated sulfuric acid to 50% dilute sulfuric acid). The dilution mixer agitator is started and stirred at a speed of 300-500 r / min to ensure thorough mixing of the acid and diluent. The heat released during the dilution process is transferred to the backwash water storage tank coil through the dilution mixer coil, heating the backwash water in the tank to 40-60℃.

[0015] Filtration and Impurity Removal: The diluted acid solution is pressurized by a magnetic pump (pressure 0.3-0.5MPa) and enters the filter through a safety valve (pressure limit set at 0.6MPa). The acid solution flows in from below the filter plate, is filtered, and flows out from above, while impurities are trapped below the filter plate. The rotating scraper is activated at a speed of 50-100 r / min, with its edge tangent to the lower edge of the filter plate, to scrape away deposited impurities in real time.

[0016] Backwashing operation: When the pressure difference between the filter inlet and outlet exceeds 0.1MPa, backwashing is started: hot water (40-60℃) in the flushing fluid storage tank is injected from the top of the filter through the pipeline, and combined with the mechanical cleaning of the rotating scraper, impurities are discharged from the bottom of the filter.

[0017] Acid replenishment to the electrolytic cell: The filtered acid is metered by a flow meter (flow control 100-500L / h) and enters the electrolytic cell; the temperature control jacket of the electrolytic cell maintains the electrolyte temperature at 40-60℃ through a heat exchanger to ensure stable electrolytic reaction.

[0018] Compared with the prior art, the beneficial effects of this utility model are: (1) By setting a rotating scraper to work with the filter plate, the deposited impurities under the filter plate can be actively removed, reducing the formation of filter cake; at the same time, the waste heat of the dilution mixer is used to heat the backwash liquid, which improves the fluidity and impact of the backwash water, enhances the removal effect on stubborn impurities, and reduces the frequency of filter clogging. (2) The waste heat continuously generated by the electrolytic cell is introduced into the insulation jacket of the concentrated acid tank through the heat exchanger, which replaces the traditional method of dilution waste heat insulation, so as to achieve continuous insulation of the concentrated acid tank and completely solve the problem of concentrated acid crystallization in low temperature environment. (3) The waste heat of the dilution mixer is transferred to the backwash liquid storage tank through the coil to heat the backwash liquid, which not only recovers the waste heat of the dilution process, but also improves the backwash efficiency and reduces energy consumption. (4) Through the synergistic effect of components such as magnetic pumps, safety valves, and flow meters, the acid delivery can be precisely controlled and protected, reducing downtime caused by equipment failure and improving the continuous production capacity of the electrolysis workshop. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the acid feed replenishment device of this utility model; In the diagram: 1. Concentrated acid tank; 2. Diluent mixer; 3. Filter; 4. Electrolytic cell; 5. Rinse solution storage tank; 6. Heat exchanger; 7. Magnetic pump; 8. Safety valve; 9. Flow meter; 10. Concentrated acid tank agitator; 11. Concentrated acid tank insulation jacket; 12. Diluent inlet; 13. Diluent mixer agitator; 14. Diluent mixer coil; 15. Rinse solution storage tank coil; 16. Filter plate; 17. Rotary scraper; 18. Electrolytic cell temperature control jacket. Detailed Implementation

[0020] To make the objectives and technical solutions of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0021] Example 1 like Figure 1 As shown, the acid feed replenishment device includes a concentrated acid tank 1, which is connected to a filter 3 via a dilution mixer 2. The filter 3 is connected to an electrolytic cell 4 via a flow meter 9. A flushing liquid storage tank 5 is connected to the filter 3. An electrolytic cell temperature control sleeve 18 is provided on the outside of the electrolytic cell 4, and a heat exchanger 6 is connected to the temperature control sleeve 18. The flushing liquid storage tank 5 has a built-in flushing liquid storage coil 15, which is connected to the dilution mixer coil 14 via a pipe, and its bottom is connected to the top of the filter. The coil absorbs the residual heat of the dilution mixer 2, heating the backwash liquid to 40-60℃, improving the flushing effect on stubborn filter cake and reducing backwashing time. The concentrated acid tank 1 is equipped with a concentrated acid tank agitator 10 driven by a drive motor, and the concentrated acid tank 1 is equipped with a concentrated acid tank insulation sleeve 11 on its outside. A magnetic pump 7 and a safety valve 8 are provided between the dilution mixer 2 and the filter 3. The dilution mixer 2 has an internal dilution mixer impeller 13, and an external dilution mixer coil 14. A diluent inlet 12 is located above the dilution mixer 2. The rinsing liquid storage tank 5 has an internal rinsing liquid storage tank coil 15, and the dilution mixer coil 14 is connected to the rinsing liquid storage tank coil 15 via a pipe. The rinsing liquid storage tank 5 is connected to the top of the filter 3. The filter 3 has an internal filter plate 16, and a rotating scraper 17 is located below the filter plate 16, with the upper edge of the rotating scraper 17 tangent to the lower edge of the filter plate 16. The connection point between the dilution mixer 2 and the filter 3 is located below the filter plate 16, and the connection point between the electrolytic cell 4 and the filter 3 is located above the filter plate 16. A flow meter 9 is located between the filter 3 and the electrolytic cell 4. The heat exchanger 6 is connected to the concentrated acid tank insulation jacket 11 via a pipe.

[0022] The above-mentioned acid feed replenishment device includes the following steps during operation: (1) Start the agitator 10 of the concentrated acid tank and stir at a speed of 100-200 r / min to ensure uniform temperature of the concentrated acid. The concentrated acid enters the dilution mixer 2 through the pipeline, and the diluent is added from the diluent inlet 12 at the same time. The dilution ratio is adjusted according to the process requirements. Start the agitator 13 of the dilution mixer and stir at a speed of 300-500 r / min to ensure that the acid and diluent are fully mixed. The heat released during the dilution process is transferred to the backwash water storage tank coil 15 through the dilution mixer coil 14 to heat the backwash water in the backwash water storage tank 5 to 40-60℃. (2) The diluted acid is pressurized by the magnetic pump 7 (pressure 0.3-0.5MPa) and enters the filter 3 through the safety valve 8. The acid flows in from below the filter plate 16, is filtered by the filter plate and flows out from above. Impurities are trapped below the filter plate. Start the rotating scraper 17 and rotate at a speed of 50-100 r / min. Its edge is tangent to the lower edge of the filter plate to scrape off the deposited impurities in real time. (3) When the pressure difference between the inlet and outlet of the filter exceeds 0.1 MPa, backwashing is started: hot water in the backwashing liquid storage tank 5 is injected from the top of the filter through the pipeline, and the impurities are discharged from the bottom of the filter by mechanical cleaning with the rotating scraper. The filtered acid solution is metered by the flow meter 9 and enters the electrolytic cell 4; the temperature control jacket 18 of the electrolytic cell maintains the electrolyte temperature at 40-60℃ through the heat exchanger 6 to ensure the stability of the electrolytic reaction.

Claims

1. An acid feed replenishment device, characterized in that, It includes a concentrated acid tank (1), which is connected to a filter (3) via a dilution mixer (2). The filter (3) is connected to an electrolytic cell (4) via a flow meter (9). A rinsing liquid storage tank (5) is connected to the filter (3). An electrolytic cell temperature control sleeve (18) is provided on the outside of the electrolytic cell (4), and a heat exchanger (6) is connected to the electrolytic cell temperature control sleeve (18).

2. The acid feed replenishment device according to claim 1, characterized in that, The concentrated acid tank (1) is equipped with a concentrated acid tank stirring paddle (10) driven by a drive motor inside, and a concentrated acid tank insulation sleeve (11) is provided on the outside of the concentrated acid tank (1). A magnetic pump (7) and a safety valve (8) are provided between the dilution mixer (2) and the filter (3).

3. The acid feed replenishment device according to claim 1, characterized in that, The dilution mixer (2) is equipped with a dilution mixer impeller (13) inside, a dilution mixer coil (14) is provided on the outside of the dilution mixer impeller (13), and a dilution liquid inlet (12) is provided above the dilution mixer (2).

4. The acid feed replenishment device according to claim 3, characterized in that, The flushing fluid storage tank (5) is equipped with a flushing fluid storage tank coil (15) inside. The dilution mixer coil (14) is connected to the flushing fluid storage tank coil (15) through a pipe. The flushing fluid storage tank (5) is connected to the top of the filter (3).

5. The acid feed replenishment device according to claim 1, characterized in that, The filter (3) is provided with a filter plate (16) inside, and a rotating scraper (17) is provided below the filter plate (16). The upper edge of the rotating scraper (17) is tangent to the lower edge of the filter plate (16).

6. The acid feed replenishment device according to claim 5, characterized in that, The dilution mixer (2) is connected to the filter (3) via a pipe located below the filter plate (16), and the electrolytic cell (4) is connected to the filter (3) via a pipe located above the filter plate (16).

7. The acid feed replenishment device according to claim 2, characterized in that, The heat exchanger (6) is connected to the insulation jacket (11) of the concentrated acid tank via a pipe.

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