CN213725659U - Process system for treating aldehyde-containing waste acid by using manganese dioxide - Google Patents
Process system for treating aldehyde-containing waste acid by using manganese dioxide Download PDFInfo
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- CN213725659U CN213725659U CN202022429018.7U CN202022429018U CN213725659U CN 213725659 U CN213725659 U CN 213725659U CN 202022429018 U CN202022429018 U CN 202022429018U CN 213725659 U CN213725659 U CN 213725659U
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Abstract
The utility model relates to an utilize manganese dioxide to handle process systems who contains aldehyde spent acid, including the heat transfer unit who connects gradually, the one-level sprays the absorption unit, the feed liquid is mixed and is reacted the unit, the solid-liquid separation unit, the aeration unit, the second grade sprays the absorption unit, acidizing fluid storage unit, the one-level sprays the absorption unit, the second grade sprays the absorption unit and all links there is tail gas processing unit, the aeration unit even has the air purification unit, salt solution storage unit, cool down the mist through the heat transfer process, later spray and absorb, it absorbs to recycle manganese dioxide, carry out the aeration again after solid-liquid separation, the last secondary sprays the absorption, discharge after the exhaust-gas treatment that the in-process produced, the liquid classification who obtains collects. The utility model discloses utilize manganese dioxide to handle the waste acid that contains aldehyde, finally obtain the hydrochloric acid solution of certain concentration and be close or reach the saturated manganese chloride solution to can promote the value of utilization and the economic benefits of the waste acid that contains aldehyde.
Description
Technical Field
The utility model relates to a technical field that industry contained aldehyde waste acid was handled especially relates to an utilize manganese dioxide to handle process systems who contains aldehyde waste acid.
Background
Nowadays, the economy of China is rapidly developing, and the demand of the organic phosphorus scale inhibitor is also increasing. During the production process of the organic phosphorus scale inhibitor, a large amount of waste gas containing formaldehyde and hydrogen chloride is generated, the waste gas is absorbed by water to become waste acid containing aldehyde, and the use and treatment of the waste acid are influenced by the presence of formaldehyde in the solution. The waste acid containing aldehyde becomes a 'hot sweet potato', and the enterprises producing the organic phosphorus scale inhibitor feel very difficult to treat the waste acid.
Disclosure of Invention
The utility model aims to solve the defects of the prior art, and provides a process system for treating aldehyde-containing waste acid by using manganese dioxide in order to improve the economic value and the utilization value of the aldehyde-containing waste acid.
The utility model discloses a realize above-mentioned purpose, adopt following technical scheme:
the process system for treating the aldehyde-containing waste acid by using the manganese dioxide comprises a heat exchange unit, a first-stage spraying absorption unit, a feed liquid mixing reaction unit, a solid-liquid separation unit, an aeration unit, a second-stage spraying absorption unit and an acid liquid storage unit which are sequentially connected, wherein the first-stage spraying absorption unit and the second-stage spraying absorption unit are both connected with a tail gas treatment unit, and the aeration unit is connected with an air purification unit and a salt liquid storage unit.
The heat exchange unit comprises a heat exchanger, a cooling medium inlet, a cooling medium outlet, a gas inlet and a gas outlet are arranged on the heat exchanger, and the gas inlet of the heat exchanger is connected with a mixed gas inlet pipe of hydrogen chloride and formaldehyde;
the primary spray absorption unit comprises a primary spray absorption tower, the lower end of the side wall of the primary spray absorption tower is provided with a gas inlet, the bottom of the side wall of the primary spray absorption tower is provided with a liquid outlet, the top of the side wall of the primary spray absorption tower is provided with a liquid inlet, the upper end of the side wall of the primary spray absorption tower is provided with an exhaust port, the gas inlet of the primary spray absorption tower is connected with the gas outlet of the heat exchanger, and the liquid inlet of the primary spray absorption tower is connected with a water inlet pump of the primary spray absorption tower;
the feed liquid mixing reaction unit comprises a feed liquid mixing reaction kettle, the top of the side wall of the feed liquid mixing reaction kettle is provided with a manganese dioxide feed inlet, the inlet of the feed liquid mixing reaction kettle is connected with the liquid outlet of the primary spray absorption tower through a first acid-resistant pump, the feed liquid mixing reaction kettle is connected with the exhaust port of the primary spray absorption tower through a pipeline, and the pipeline is provided with a pressure reducing valve;
the solid-liquid separation unit comprises a solid-liquid separator, the solid-liquid separator is provided with a mixture inlet, a solid outlet and a liquid outlet, the mixture inlet of the solid-liquid separator is connected with the outlet of the feed liquid mixing reaction kettle through a second acid-resistant pump, and the solid outlet of the solid-liquid separator is connected with the feed liquid mixing reaction kettle through a solid medicament return pump;
the aeration unit comprises an aeration tank, an inlet of the aeration tank is connected with a liquid outlet of the solid-liquid separator through a third acid-resistant pump, and an aeration head is arranged in the aeration tank;
the air purification unit comprises an air purifier, and the air purifier is connected with an aeration head in the aeration tank through an aeration pump;
the salt solution storage unit comprises a salt solution storage tank, and an outlet at the bottom of the aeration tank is connected with the salt solution storage tank;
the second-stage spraying absorption unit comprises a second-stage spraying absorption tower, a gas inlet is formed in the lower end of the side wall of the second-stage spraying absorption tower, a liquid outlet is formed in the bottom of the side wall of the second-stage spraying absorption tower, a liquid inlet is formed in the top of the second-stage spraying absorption tower, an exhaust port is formed in the upper end of the side wall of the second-stage spraying absorption tower, the gas inlet of the second-stage spraying absorption tower is connected with the gas outlet in the top of the aeration tank through a fourth acid-resistant pump, and the liquid inlet of the second-stage spraying absorption tower is connected with a water inlet pump of the second-stage spraying absorption tower;
the acid liquid storage unit comprises a hydrochloric acid storage tank, and the hydrochloric acid storage tank is connected with a liquid outlet of the secondary spray absorption tower through a fifth acid-resistant pump;
the tail gas treatment unit comprises a first tail gas processor and a second tail gas processor, the first tail gas processor is connected with a pipeline where a pressure reducing valve between the first-stage spray absorption tower and the feed liquid mixing reaction kettle is located, and the second tail gas processor is connected with an exhaust port of the second-stage spray absorption tower.
And a liquid foam filtering plate layer is arranged at the upper part in the aeration tank.
And a circulating liquid port is arranged below the liquid foam filtering plate layer on the aeration tank and is connected with a top liquid inlet of the first-stage spray absorption tower through a sixth acid-resistant pump.
The feed liquid is stirred and is mixed and be equipped with agitating unit in the reation kettle, agitating unit even has agitator motor.
The heat exchanger is internally provided with a snakelike heat exchange tube which is connected with a cooling medium inlet and a cooling medium outlet.
The treatment method of the process system for treating the aldehyde-containing waste acid by using the manganese dioxide comprises the following specific steps:
s1, enabling the mixed gas of hydrogen chloride and formaldehyde to enter a heat exchanger through a hydrogen chloride and formaldehyde mixed gas inlet pipe, and realizing the reduction of the temperature of the mixed gas by exchanging heat with a cooling medium flowing in the heat exchanger;
s2, allowing the cooled mixed gas to enter a primary spray absorption tower, continuously spraying an absorption liquid downwards from a liquid inlet at the top of the primary spray absorption tower, and absorbing the mixed gas of hydrogen chloride and formaldehyde to form aldehyde-containing waste acid liquid L1The tail gas is discharged after being treated by the first tail gas treater;
S3、aldehyde-containing waste acid feed liquid L1Pumping into a material liquid mixing reaction kettle, and adding manganese dioxide and manganese dioxide into the material liquid mixing reaction kettle, wherein the adding amount of the manganese dioxide and the aldehyde-containing waste acid material liquid L1The mass ratio of the formaldehyde in the waste acid liquid is 1.5-5.0, and the waste acid liquid containing the formaldehyde L1The retention time in the material liquid mixing reaction kettle is 10min-300min, the formaldehyde can be completely consumed, and finally the material liquid L for removing the formaldehyde is obtained2；
S4 feed liquid L for removing formaldehyde2Pumping into a solid-liquid separator to realize solid-liquid separation to obtain a solution L3The unreacted manganese dioxide and the unreacted manganese dioxide are returned to the material liquid mixing reaction kettle through a solid medicament return pump to be reused;
s5 solution L3The aeration tank is aerated by clean air, the upper part of the aeration tank is provided with a liquid foam filtering laminate, the separation of gas and liquid foam can be realized, and the solution L3The retention time in the aeration tank is 10min-300min, the aeration volume flow is 0.1-200L/min, and the solution L from which the hydrogen chloride is removed4Pumping to a first-stage spray absorption tower for cyclic utilization, and obtaining solution L4Recycling the solution L when the saturation of manganese chloride is approached or reached4Pumping the salt solution into a salt solution storage tank for storage;
s6, enabling the gas flowing out of the aeration tank to enter a secondary spraying absorption tower, controlling the concentration of hydrochloric acid by controlling the using amount of spraying clear water, storing the finally obtained hydrochloric acid solution into a hydrochloric acid storage tank, and treating the tail gas generated by the secondary spraying absorption tower by a second tail gas processor to achieve the standard and discharge.
In step S2, during operation in the first-stage spray absorption tower, aldehyde-containing waste acid feed liquid L is controlled1The concentration of the hydrogen chloride is between 1mol/L and 5 mol/L.
In step S3, the manganese dioxide feed inlet is timely replenished with the required manganese dioxide according to the consumption of the manganese dioxide.
The utility model has the advantages that: the utility model discloses utilize manganese dioxide to handle the waste acid that contains aldehyde, finally obtain the hydrochloric acid solution of certain concentration and be close or reach the saturated manganese chloride solution to can promote the value of utilization and the economic benefits of the waste acid that contains aldehyde.
Drawings
FIG. 1 is a schematic view of a treatment system of the present invention;
in the figure: a 1-hydrogen chloride and formaldehyde mixed gas inlet pipe; 2-a heat exchanger; 3-first stage spray absorption tower; 4-a first acid-resistant pump; 5-mixing the feed liquid in a reaction kettle; 6-a second acid-resistant pump; 7-a solid-liquid separator; 8-a third acid-resistant pump; 9-an aeration tank; 10-a fourth acid-resistant pump; 11-a secondary spray absorption tower; 12-a fifth acid resistant pump; 13-a hydrochloric acid storage tank; 14-a water inlet pump of the secondary spray absorption tower; 15-an air purifier; 16-an aeration pump; 17-a salt solution storage tank; 18-a pressure relief valve; 19-a first tail gas processor; 20-a first-stage spray absorption tower water inlet pump; 21-solid dose return pump; 22-a second tail gas processor; 23-manganese dioxide feed inlet; 24-a sixth acid-resistant pump;
the following detailed description will be made in conjunction with embodiments of the present invention with reference to the accompanying drawings.
Detailed Description
The invention will be further explained with reference to the following figures and examples:
as shown in fig. 1, a process system for treating aldehyde-containing waste acid by using manganese dioxide comprises a heat exchange unit, a primary spray absorption unit, a feed liquid mixing reaction unit, a solid-liquid separation unit, an aeration unit, a secondary spray absorption unit and an acid liquid storage unit which are connected in sequence, wherein the primary spray absorption unit and the secondary spray absorption unit are both connected with a tail gas treatment unit, and the aeration unit is connected with an air purification unit and a salt liquid storage unit.
The heat exchange unit comprises a heat exchanger 2, a cooling medium inlet, a cooling medium outlet, a gas inlet and a gas outlet are arranged on the heat exchanger 2, and the gas inlet of the heat exchanger 2 is connected with a mixed gas inlet pipe 1 of hydrogen chloride and formaldehyde;
the primary spray absorption unit comprises a primary spray absorption tower 3, the lower end of the side wall of the primary spray absorption tower 3 is provided with a gas inlet, the bottom of the side wall of the primary spray absorption tower 3 is provided with a liquid outlet, the top of the side wall of the primary spray absorption tower 3 is provided with a liquid inlet, the upper end of the side wall of the primary spray absorption tower is provided with an exhaust port, the gas inlet of the primary spray absorption tower 3 is connected with the gas outlet of the heat exchanger 2, and the liquid inlet of the primary spray absorption tower 3 is connected with a primary spray absorption tower water inlet pump 20;
the feed liquid mixing reaction unit comprises a feed liquid mixing reaction kettle 5, the top of the side wall of the feed liquid mixing reaction kettle 5 is provided with a manganese dioxide feed inlet 23, the inlet of the feed liquid mixing reaction kettle 5 is connected with the liquid outlet of the primary spray absorption tower 3 through a first acid-resistant pump 4, the feed liquid mixing reaction kettle 5 is connected with the exhaust port of the primary spray absorption tower 3 through a pipeline, and the pipeline is provided with a pressure reducing valve 18;
the solid-liquid separation unit comprises a solid-liquid separator 7, the solid-liquid separator 7 is provided with a mixture inlet, a solid outlet and a liquid outlet, the mixture inlet of the solid-liquid separator 7 is connected with the outlet of the feed liquid mixing reaction kettle 5 through a second acid-resistant pump 6, and the solid outlet of the solid-liquid separator 7 is connected with the feed liquid mixing reaction kettle 5 through a solid medicament return pump 21;
the aeration unit comprises an aeration tank 9, the inlet of the aeration tank 9 is connected with the liquid outlet of the solid-liquid separator 7 through a third acid-proof pump 8, and an aeration head is arranged in the aeration tank 9;
the air purification unit comprises an air purifier 15, and the air purifier 15 is connected with an aeration head in the aeration tank 9 through an aeration pump 16;
the salt solution storage unit comprises a salt solution storage tank 17, and an outlet at the bottom of the aeration tank 9 is connected with the salt solution storage tank 17;
the secondary spray absorption unit comprises a secondary spray absorption tower 11, a gas inlet is formed in the lower end of the side wall of the secondary spray absorption tower 11, a liquid outlet is formed in the bottom of the side wall of the secondary spray absorption tower, a liquid inlet is formed in the top of the side wall of the secondary spray absorption tower 11, an exhaust port is formed in the upper end of the side wall of the secondary spray absorption tower, the gas inlet of the secondary spray absorption tower 11 is connected with the gas outlet in the top of the aeration tank 9 through a fourth acid-resistant pump 10, and the liquid inlet of the secondary spray absorption tower 11 is connected with a secondary spray absorption tower water inlet pump 14;
the acid liquid storage unit comprises a hydrochloric acid storage tank 13, and the hydrochloric acid storage tank 13 is connected with a liquid outlet of the secondary spray absorption tower 11 through a fifth acid-resistant pump 12;
the tail gas treatment unit comprises a first tail gas processor 19 and a second tail gas processor 22, the first tail gas processor 19 is connected with a pipeline where a pressure reducing valve 18 between the first-stage spray absorption tower 3 and the feed liquid mixing reaction kettle 5 is located, and the second tail gas processor 22 is connected with an exhaust port of the second-stage spray absorption tower 11.
And a liquid foam filtering plate layer is arranged at the upper part in the aeration tank 9.
And a circulating liquid port is arranged below the liquid foam filtering plate layer on the aeration tank 9 and is connected with a top liquid inlet of the first-stage spray absorption tower 3 through a sixth acid-resistant pump 24.
A stirring device is arranged in the feed liquid mixing reaction kettle 5, and the stirring device is connected with a stirring motor.
And a snake-shaped heat exchange tube is arranged in the heat exchanger 2 and is connected with a cooling medium inlet and a cooling medium outlet.
The treatment method of the process system for treating the aldehyde-containing waste acid by using the manganese dioxide comprises the following specific steps:
s1, enabling the mixed gas of hydrogen chloride and formaldehyde to enter a heat exchanger 2 through a hydrogen chloride and formaldehyde mixed gas inlet pipe 1, and achieving self temperature reduction through heat exchange with a cooling medium flowing inside the heat exchanger 2;
s2, allowing the cooled mixed gas to enter a primary spray absorption tower 3, continuously spraying an absorption liquid downwards from a liquid inlet at the top of the primary spray absorption tower 3, and absorbing the mixed gas of hydrogen chloride and formaldehyde to form aldehyde-containing waste acid feed liquid L1The tail gas is discharged after being treated by the first tail gas treater 19;
s3 aldehyde-containing waste acid feed liquid L1Pumping into a feed liquid mixing reaction kettle 5, adding manganese dioxide into the feed liquid mixing reaction kettle 5, adding the manganese dioxide and the aldehyde-containing waste acid feed liquid L1The mass ratio of the formaldehyde in the waste acid liquid is 1.5-5.0, and the waste acid liquid containing the formaldehyde L1The retention time in the feed liquid mixing reaction kettle 5 is 10min-300min, the formaldehyde can be completely consumed, and finally the feed liquid L for removing the formaldehyde is obtained2；
S4 feed liquid L for removing formaldehyde2Pumping into a solid-liquid separator 7 to realize solid-liquid separation to obtain a solution L3With unreacted manganese dioxide, unreacted dioxideManganese returns to the feed liquid mixing reaction kettle 5 through the solid medicament return pump 21 to be reused;
s5 solution L3Aeration is carried out by utilizing clean air after entering the aeration tank 9, a liquid foam filtering laminate is arranged on the upper part of the aeration tank 9, the separation of gas and liquid foam can be realized, and the solution L3The retention time in the aeration tank 9 is 10min-300min, the aeration volume flow is 0.1-200L/min, and the solution L from which the hydrogen chloride is removed4Pumping to a first-stage spray absorption tower 3 for cyclic utilization, and recycling the solution L4Recycling the solution L when the saturation of manganese chloride is approached or reached4Pumping to a salt solution storage tank 17 for storage;
s6, the gas flowing out of the aeration tank 9 enters a secondary spray absorption tower 11, the concentration of hydrochloric acid is controlled by controlling the amount of spray clear water, the finally obtained hydrochloric acid solution is stored in a hydrochloric acid storage tank 13, and the tail gas generated by the secondary spray absorption tower 11 is treated by a second tail gas processor 22 and then is discharged after reaching the standard.
In step S2, during operation in the first-stage spray absorption tower 3, the aldehyde-containing waste acid feed liquid L is controlled1The concentration of the hydrogen chloride is between 1mol/L and 5 mol/L.
In step S3, the manganese dioxide supply port 23 is replenished with the required manganese dioxide in time in accordance with the consumption of the manganese dioxide.
The specific embodiment is as follows:
containing a mixed gas of hydrogen chloride and formaldehyde, wherein the concentration of formaldehyde is 0.1-0.2mol/m3The concentration of hydrogen chloride is 20-30mol/m3The volume of the mixed gas is 100-150m3The temperature is 70-90 ℃, the temperature of the mixed gas is changed into 20-40 ℃ after passing through the heat exchanger 2, and the mixed gas is pumped into the first-stage spray absorption tower 3 and then is used for 1-2m3Absorbing with water to obtain aldehyde-containing waste acid L1Adding aldehyde-containing waste acid L1Pumping the mixture to a material liquid mixing reaction kettle 5, adding 50-200mol of manganese dioxide, mixing and stirring for 40-300min, and adding a material liquid L2Pumping to a solid-liquid separator 7 for solid-liquid separation to obtain a solution L3Is 0.8-0.98m3And a mass of unreacted manganese dioxide, wherein the solution L3Pumping the mixture to an aeration tank 9 for aeration, wherein the aeration flow is 0.2-1.5m3Min, solution L3Staying in the aeration tank for 10-200min, and after aeration, remaining solution L4Pumping into a first-stage spray absorption tower 3 for absorbing the hydrogen chloride formaldehyde mixed gas in the next round, enabling the gas to enter a second-stage spray absorption tower 11, adjusting the volume of clean water used by the second-stage spray absorption tower 11 to realize the regulation and control of the final hydrochloric acid concentration, pumping into a hydrochloric acid storage tank 13 after the absorption is finished, treating the tail gas by a second tail gas processor 22 to reach the standard and discharge, and enabling the solution L to reach the standard4And circulating for 10-20 times, pumping into a salt solution storage tank 17, and performing evaporation crystallization according to conditions to obtain manganese chloride solid and a manganese chloride solution with a certain concentration, so that the treatment of the aldehyde-containing waste acid is realized, and a hydrochloric acid solution with a certain concentration and a manganese chloride solution close to or reaching saturation are finally obtained, so that the utilization value and the economic benefit of the aldehyde-containing waste acid can be improved.
The present invention has been described above with reference to the accompanying drawings, and it is obvious that the present invention is not limited by the above embodiments, and various improvements made by the method concept and technical solution of the present invention or directly applied to other occasions without improvement are all within the protection scope of the present invention.
Claims (6)
1. The process system for treating the aldehyde-containing waste acid by using the manganese dioxide is characterized by comprising a heat exchange unit, a primary spraying absorption unit, a feed liquid mixing reaction unit, a solid-liquid separation unit, an aeration unit, a secondary spraying absorption unit and an acid liquid storage unit which are sequentially connected, wherein the primary spraying absorption unit and the secondary spraying absorption unit are both connected with a tail gas treatment unit, and the aeration unit is connected with an air purification unit and a salt liquid storage unit.
2. The process system for treating waste acid containing aldehyde by using manganese dioxide as claimed in claim 1,
the heat exchange unit comprises a heat exchanger (2), a cooling medium inlet, a cooling medium outlet, a gas inlet and a gas outlet are arranged on the heat exchanger (2), and the gas inlet of the heat exchanger (2) is connected with a mixed gas inlet pipe (1) of hydrogen chloride and formaldehyde;
the primary spray absorption unit comprises a primary spray absorption tower (3), a gas inlet is formed in the lower end of the side wall of the primary spray absorption tower (3), a liquid outlet is formed in the bottom of the side wall of the primary spray absorption tower, a liquid inlet is formed in the top of the side wall of the primary spray absorption tower, an exhaust port is formed in the upper end of the side wall of the primary spray absorption tower (3), the gas inlet of the primary spray absorption tower (3) is connected with the gas outlet of the heat exchanger (2), and the liquid inlet of the primary spray absorption tower (3) is connected with a primary spray absorption tower water inlet pump (20);
the feed liquid mixing reaction unit comprises a feed liquid mixing reaction kettle (5), a manganese dioxide feed inlet (23) is formed in the top of the side wall of the feed liquid mixing reaction kettle (5), an inlet of the feed liquid mixing reaction kettle (5) is connected with a liquid outlet of the primary spray absorption tower (3) through a first acid-resistant pump (4), the feed liquid mixing reaction kettle (5) is connected with an exhaust port of the primary spray absorption tower (3) through a pipeline, and a pressure reducing valve (18) is arranged on the pipeline;
the solid-liquid separation unit comprises a solid-liquid separator (7), a mixture inlet, a solid outlet and a liquid outlet are formed in the solid-liquid separator (7), the mixture inlet of the solid-liquid separator (7) is connected with the outlet of the feed liquid mixing reaction kettle (5) through a second acid-resistant pump (6), and the solid outlet of the solid-liquid separator (7) is connected with the feed liquid mixing reaction kettle (5) through a solid medicament return pump (21);
the aeration unit comprises an aeration tank (9), the inlet of the aeration tank (9) is connected with the liquid outlet of the solid-liquid separator (7) through a third acid-resistant pump (8), and an aeration head is arranged in the aeration tank (9);
the air purification unit comprises an air purifier (15), and the air purifier (15) is connected with an aeration head in the aeration tank (9) through an aeration pump (16);
the salt solution storage unit comprises a salt solution storage tank (17), and an outlet at the bottom of the aeration tank (9) is connected with the salt solution storage tank (17);
the secondary spray absorption unit comprises a secondary spray absorption tower (11), a gas inlet is formed in the lower end of the side wall of the secondary spray absorption tower (11), a liquid outlet is formed in the bottom of the side wall of the secondary spray absorption tower, a liquid inlet is formed in the top of the side wall of the secondary spray absorption tower, an exhaust port is formed in the upper end of the side wall of the secondary spray absorption tower, the gas inlet of the secondary spray absorption tower (11) is connected with a gas outlet in the top of the aeration tank (9) through a fourth acid-resistant pump (10), and the liquid inlet of the secondary spray absorption tower (11) is connected with a secondary spray absorption tower water inlet pump (14);
the acid liquid storage unit comprises a hydrochloric acid storage tank (13), and the hydrochloric acid storage tank (13) is connected with a liquid outlet of the secondary spray absorption tower (11) through a fifth acid-resistant pump (12);
the tail gas treatment unit comprises a first tail gas processor (19) and a second tail gas processor (22), the first tail gas processor (19) is connected with a pipeline where a pressure reducing valve (18) between the primary spray absorption tower (3) and the feed liquid mixing reaction kettle (5) is located, and the second tail gas processor (22) is connected with an exhaust port of the secondary spray absorption tower (11).
3. The process system for treating waste acid containing aldehyde by using manganese dioxide as claimed in claim 2, wherein the aeration tank (9) is provided with a liquid foam filter plate layer at the upper part inside.
4. The process system for treating aldehyde-containing waste acid by using manganese dioxide as claimed in claim 3, wherein a circulating liquid port is arranged below the liquid foam filtering plate layer on the aeration tank (9), and the circulating liquid port is connected with a top liquid inlet of the primary spray absorption tower (3) through a sixth acid-proof pump (24).
5. The process system for treating waste acid containing aldehyde by using manganese dioxide as claimed in claim 4, wherein a stirring device is arranged in the feed liquid mixing reaction kettle (5), and the stirring device is connected with a stirring motor.
6. The process system for treating waste acid containing aldehyde by using manganese dioxide as claimed in claim 5, wherein a serpentine heat exchange tube is arranged in the heat exchanger (2), and the serpentine heat exchange tube is connected with a cooling medium inlet and a cooling medium outlet.
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