Waste acid recovery treatment device

Abstract

The utility model provides a waste acid recovery processing device which comprises a pretreatment unit, a distillation concentration unit, a separation purification unit and a cyclic utilization unit, the pretreatment unit comprises a filter and an adjusting tank, the liquid inlet end of the filter is connected with a waste acid inlet pipe, the filter is communicated with the adjusting tank, and a plurality of layers of stainless steel filter screens are arranged in an inner cavity of the filter. The distillation and concentration unit comprises a distillation tower, a reboiler and a condenser, the liquid outlet end of the adjusting tank is connected with the liquid inlet end in the middle of the distillation tower through a first pipeline, the reboiler is installed at the bottom of the distillation tower, the condenser is installed at the top of the distillation tower, and multiple layers of tower plates are arranged in the distillation tower; the recycling unit is arranged on one side of the separation and purification unit, and the waste acid liquid is effectively treated and recycled, so that the emission of the waste acid liquid is reduced, and the pollution to the environment is reduced. Meanwhile, the recycled acid and water are recycled, resources are saved, and the requirement of sustainable development is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to waste acid treatment technical field especially relates to a waste acid recovery treatment device. BACKGROUND

[0002] In numerous industrial production processes, such as metal surface treatment, chemical synthesis, electronic etching and other industries, a large amount of waste acid liquid will be produced. These waste acid liquids not only contain high concentration of acid, but also may contain various metal ions, organic matter and other impurities. If directly discharged, not only will it cause serious pollution to the environment, destroy the ecological balance of soil and water body, but also will waste a lot of resources.

[0003] At present, the common waste acid treatment methods mainly include neutralization method, extraction method, membrane separation method, evaporation concentration method, etc. Although the neutralization method is simple to operate, it will produce a large amount of salt waste, which needs subsequent treatment and cannot realize the recycling of acid; the extraction method has good treatment effect on some specific waste acid systems, but the selection and regeneration of extractant are relatively complex and the cost is high; the membrane separation method can realize the separation of acid and impurities, but the service life of the membrane is limited and it is easy to be contaminated, which needs frequent replacement and has high operation cost; the evaporation concentration method has large energy consumption and is easy to cause equipment corrosion and scaling problems in the evaporation process.

[0004] In summary, the existing waste acid treatment technology has various deficiencies and cannot meet the efficient, low-cost and environmentally friendly waste acid recovery and treatment requirements. Therefore, it is necessary to design a waste acid recovery and treatment device. SUMMARY

[0005] The utility model provides a kind of waste acid recovery treatment device to solve the problems of low processing efficiency, high cost, resource waste and environmental pollution in the existing waste acid treatment technology, realizes the effective treatment and recycling of waste acid liquid, reduces the discharge of waste acid liquid and reduces the pollution to environment.

[0006] The utility model provides a kind of waste acid recovery treatment device, including pretreatment unit, distillation concentration unit, separation and purification unit and recycling unit;

[0007] The pretreatment unit includes filter and adjusting pool, the filter inlet end is connected with waste acid inlet pipe, the filter is communicated with adjusting pool, and multiple layers of stainless steel filter screen are installed in the filter inner chamber;

[0008] The distillation concentration unit includes distillation column, reboiler and condenser, the liquid outlet of adjusting pool is connected with the liquid inlet in the middle of distillation column by first pipeline, the reboiler is installed at the bottom of distillation column, the condenser is installed at the top of distillation column, and multiple layers of column plate are arranged in the distillation column;

[0009] The separation and purification unit is arranged on one side of the distillation tower, the separation and purification unit comprises an ion exchange resin column and an activated carbon adsorption column, the bottom of the distillation tower is connected with the top liquid inlet end of the ion exchange resin column through a second pipeline, the bottom liquid outlet end of the ion exchange resin column is connected with the liquid inlet end of the activated carbon adsorption column through a third pipeline, and the activated carbon adsorption column is arranged below the ion exchange resin column.

[0010] The recycling unit is arranged on one side of the separation and purification unit, the recycling unit comprises a recovered acid liquid storage tank and a circulating pump, the liquid outlet end of the activated carbon adsorption column is communicated with the recovered acid liquid storage tank through a fourth pipeline, the recovered acid liquid storage tank is connected with an external acid tank or a reaction kettle through a discharge pipe, and the circulating pump is connected with the discharge pipe.

[0011] Preferably, a feeding hopper is arranged at the top of the adjusting tank, a longitudinal stirring shaft is arranged in the adjusting tank, and stirring rods are arranged on the outer wall of the longitudinal stirring shaft in a tilted manner; and the top end of the longitudinal stirring shaft is in transmission connection with the motor shaft of a servo motor arranged on the top of the adjusting tank.

[0012] Preferably, a pH sensor is further arranged on the inner wall of the adjusting tank, and the pH sensor is connected with an external monitoring terminal.

[0013] Preferably, the condenser adopts a tube type heat exchanger structure, the condenser is connected with the top liquid inlet end of the distillation tower through a reflux pipe, and a purified water discharge pipe is further arranged on the condenser.

[0014] Preferably, the ion exchange resin column is filled with strong acid cation exchange resin, and the activated carbon adsorption column is filled with granular activated carbon.

[0015] Preferably, a first adjusting valve is arranged on the outside of the waste acid inlet pipe, a second adjusting valve is arranged on the purified water discharge pipe, and a third adjusting valve is arranged on the discharge pipe.

[0016] Beneficial effects:

[0017] (1) The utility model discloses a waste acid liquid treatment device, which comprises a pretreatment unit, a distillation and concentration unit, a separation and purification unit, a recycling unit and a condenser.

[0018] (2) The utility model discloses a waste acid liquid treatment device, which comprises a pretreatment unit, a distillation and concentration unit, a separation and purification unit, a recycling unit and a condenser.

[0019] The above description is only a summary of the technical scheme of the embodiments of the present application, in order to more clearly understand the technical means of the embodiments of the present application, the embodiments can be implemented according to the content of the specification, and in order to make the above and other purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the specific embodiments of the present application will be described below. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below, and obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating creative labor.

[0021] Fig. 1 It is a structural schematic diagram of the present application;

[0022] Fig. 2 It is a structural schematic diagram of the distillation and concentration unit of the present application;

[0023] Fig. 3 It is a structural schematic diagram of the adjusting tank of the present application;

[0024] The filter 1, the adjusting tank 2, the waste acid inlet pipe 3, the stainless steel filter screen 4, the distillation column 5, the reboiler 6, the condenser 7, the first pipeline 8, the tray 9, the ion exchange resin column 10, the activated carbon adsorption column 11, the second pipeline 12, the third pipeline 13, the recovered acid liquid storage tank 14, the circulating pump 15, the fourth pipeline 16, the discharge pipe 17, the feed hopper 18, the longitudinal stirring shaft 19, the stirring rod 20, the servo motor 21, the pH value sensor 22, the reflux pipe 23, the purified water discharge pipe 24, the first adjusting valve 25, the second adjusting valve 26, and the third adjusting valve 27. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creating creative labor belong to the scope of protection of the present application.

[0026] In addition, the terms "first", "second" and the like in the specification and claims of the present application or the above drawings are used to distinguish different objects, and are not used to describe a specific order, and can explicitly or implicitly include one or more of the features.

[0027] In the description of the utility model, it needs to explain, unless another explicit provision and limitation, the term "installation", "link", "connection" should do the broad sense understanding, for example, the "link" or "connection" of mechanical structure can refer to the physical connection, for example, the physical connection can be fixed connection, for example through the fixed part fixed connection, for example through screw, bolt or other fixed part fixed connection;The physical connection can also be detachable connection, for example, mutual clamping or clamping connection;The physical connection can also be integrally connected, for example, welding, bonding or integrally formed connection is connected to be connected.For the person skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0028] In order to enable the personnel in the technical field to better understand the utility model scheme, the technical scheme in the utility model embodiment will be clearly and completely described below in conjunction with the drawings.

[0029] Please refer to Figs. 1-3 The utility model discloses a kind of waste acid recovery treatment device, including pretreatment unit, distillation concentration unit, separation purification unit and recycling unit;

[0030] The pretreatment unit includes filter 1 and adjusting pool 2, the filter 1 inlet end is connected with waste acid inlet pipe 3, the filter 1 is communicated with adjusting pool 2, multiple layers of stainless steel filter screen 4 are installed in the filter 1 inner chamber, can effectively remove the solid particle impurities in waste acid liquid, prevent its from causing blockage and damage to subsequent equipment.Waste acid liquid after filtering enters adjusting pool;

[0031] The distillation concentration unit includes distillation column 5, reboiler 6 and condenser 7, the liquid outlet of adjusting pool 2 is connected with the liquid inlet in the middle of distillation column 5 by first pipeline 8, the reboiler 6 is installed at the bottom of distillation column 5, the condenser 7 is installed at the top of distillation column 5, multiple layers of column plate 9 are arranged in the distillation column 5, condenser 7 uses column type heat exchanger structure, the condenser 7 is connected with the liquid inlet at the top of distillation column 5 by reflux pipe 23, and the condenser 7 is also provided with purified water discharge pipe 24;Waste acid liquid after adjustment enters from the middle of distillation column, in distillation column, heat is provided by reboiler, so that the moisture in waste acid liquid and low-boiling-point impurities gradually evaporate and rise, while high-boiling-point acid and other impurities remain at the bottom of the column.The rising steam enters the condenser, and after condensation, it becomes liquid, part of which returns to the top of the distillation column as reflux liquid to maintain the rectification effect in the column, and the other part is discharged as purified water.The concentrated acid liquid obtained at the bottom of the column enters the separation purification unit.

[0032] The separation and purification unit is arranged on one side of the distillation column 5, and the separation and purification unit comprises an ion exchange resin column 10 and an activated carbon adsorption column 11; the bottom of the distillation column 5 is connected with the top liquid inlet end of the ion exchange resin column 10 through a second pipeline 12; the bottom liquid outlet end of the ion exchange resin column 10 is connected with the liquid inlet end of the activated carbon adsorption column 11 through a third pipeline 13; and the activated carbon adsorption column 11 is arranged below the ion exchange resin column 10; the concentrated acid liquid first enters the ion exchange resin column, and metal ions and other impurities in the acid liquid are removed through ion exchange reaction; then, the acid liquid after ion exchange treatment enters the activated carbon adsorption column, and the organic matters and residual small impurities in the acid liquid are further removed by using the adsorption of activated carbon, so that the recovered acid liquid with high purity is obtained.

[0033] The recycling unit is arranged on one side of the separation and purification unit, and the recycling unit comprises a recovered acid liquid storage tank 14 and a circulating pump 15; the liquid outlet end of the activated carbon adsorption column 11 is communicated with the recovered acid liquid storage tank 14 through a fourth pipeline 16; the recovered acid liquid storage tank 14 is connected with an external acid tank or a reaction kettle through a discharge pipeline 17; and the circulating pump 15 is connected with the discharge pipeline 17.

[0034] In the utility model, the adjusting pool 2 upper end installs the feeding hopper 18, the adjusting pool 2 inside installs longitudinal stirring shaft 19, the longitudinal stirring shaft 19 outer wall installs the stirring rod 20 of oblique arrangement, the longitudinal stirring shaft 19 top and the motor shaft transmission connection of servo motor 21 arranged in the adjusting pool 2 outer top, adjusting pool 2 inner wall still installs pH value sensor 22, the pH value sensor 22 is connected with external monitoring terminal.pH value sensor, real-time monitoring waste acid liquid's pH value.Through the feeding hopper to the adjusting pool and add the appropriate amount of sodium hydroxide or sulfuric acid and other acid-base regulator, adjust waste acid liquid's pH value to 3-5 range.In the adjustment process, utilize longitudinal stirring shaft, stirring rod to the stirring of waste acid liquid, make it fully mixed, ensure that pH value is uniform and stable.

[0035] In the utility model, the ion exchange resin column 10 is filled with strong acid cation exchange resin, can occur ion exchange reaction with the metal ion in acid liquid, adsorbs the metal ion on the resin, thereby removing the metal ion impurities in acid liquid; the activated carbon adsorption column 11 is filled with granular activated carbon, and the organic matters and residual small impurities in the acid liquid are adsorbed by using the large specific surface area and the rich microporous structure of activated carbon.

[0036] In addition, the first adjusting valve 25 is arranged outside the waste acid inlet pipe 3, the second adjusting valve 26 is arranged on the purified water discharge pipe 24, and the third adjusting valve 27 is arranged on the discharge pipe 17.

[0037] Working principle: waste acid liquid first flows into the filter, the filter multi-layer filter screen structure will be filtered out in turn according to the pore size size of solid particle impurities with particle size greater than 0.1mm, the filtered waste acid liquid enters the adjusting tank, the pH value sensor in the adjusting tank real-time monitoring the pH value of waste acid liquid, at the same time, the stirrer is opened, make waste acid liquid and adjusting agent fully mixed, the waste acid liquid with adjusted pH value is transported to the middle feeding port of distillation column, the reboiler at the bottom of distillation column provides heat through steam or electric heating mode, after waste acid liquid is heated, water and low boiling point impurities are evaporated and rise, form steam. The steam is in the rising process, with the liquid on the multilayer tray in the tower constantly carries out heat and mass exchange, makes the acid content in the steam gradually reduces, the water content and low boiling point impurities content gradually increases;The steam rising to the top of the distillation column enters the condenser, the condenser utilizes circulating cooling water to cool and condense the steam. The condensed liquid part returns to the top of the distillation column as reflux liquid, another part is discharged as purified water;The acid liquid after distillation and concentration flows into the ion exchange resin column, the strong acid cation exchange resin filled in the column and metal ions in the acid liquid carry out ion exchange reaction, adsorb metal ions on the resin, after ion exchange treatment, the acid liquid enters the activated carbon adsorption column, utilize the huge specific surface area and rich microporous structure of activated carbon, adsorb organic matter and residual small impurities in the acid liquid, high-purity recovered acid liquid flows into the recovered acid liquid storage tank, the circulating pump transports the acid liquid in the recovered acid liquid storage tank to the acid tank or reaction kettle of industrial production system, realize the recycling of acid.

[0038] In summary, the utility model discloses through the effective treatment and recycling of waste acid liquid, reduce the discharge of waste acid liquid, reduce the pollution to the environment. Meanwhile, the recovered acid and water are recycled, save resources, meet the requirement of sustainable development.

[0039] The above-described and the above-described embodiments are only used to illustrate the technical solutions of the utility model, and not to limit them;Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it still can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features;And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A waste acid recovery treatment device characterized by comprising: The application relates to a waste acid treatment device, which comprises a pretreatment unit, a distillation and concentration unit, a separation and purification unit and a recycling unit. The pretreatment unit comprises a filter (1) and a regulating tank (2), the filter (1) is connected with a waste acid inlet pipe (3), the filter (1) is communicated with the regulating tank (2), and a plurality of stainless steel filter screens (4) are arranged in the filter (1). The distillation and concentration unit comprises a distillation tower (5), a reboiler (6) and a condenser (7), the liquid outlet end of the regulating tank (2) is connected with the liquid inlet end of the middle part of the distillation tower (5) through a first pipeline (8), the reboiler (6) is arranged at the bottom of the distillation tower (5), the condenser (7) is arranged at the top of the distillation tower (5), and a plurality of tower plates (9) are arranged in the distillation tower (5). The separation and purification unit is arranged on one side of the distillation tower (5), the separation and purification unit comprises an ion exchange resin column (10) and an activated carbon adsorption column (11), the bottom of the distillation tower (5) is connected with the liquid inlet end of the top of the ion exchange resin column (10) through a second pipeline (12), the liquid outlet end of the bottom of the ion exchange resin column (10) is connected with the liquid inlet end of the activated carbon adsorption column (11) through a third pipeline (13), and the activated carbon adsorption column (11) is arranged below the ion exchange resin column (10). The recycling unit is arranged on one side of the separation and purification unit, the recycling unit comprises a recovered acid liquid storage tank (14) and a circulating pump (15), the liquid outlet end of the activated carbon adsorption column (11) is communicated with the recovered acid liquid storage tank (14) through a fourth pipeline (16), the recovered acid liquid storage tank (14) is connected with an external acid tank or a reaction kettle through a discharge pipe (17), and the circulating pump (15) is connected with the discharge pipe (17).

2. The waste acid recovery treatment device according to claim 1, characterized by A feeding hopper (18) is arranged on the upper end of the regulating tank (2), a longitudinal stirring shaft (19) is arranged in the regulating tank (2), inclined stirring rods (20) are arranged on the outer wall of the longitudinal stirring shaft (19), and the top end of the longitudinal stirring shaft (19) is in transmission connection with the motor shaft of a servo motor (21) arranged on the top of the regulating tank (2).

3. The waste acid recovery treatment apparatus according to claim 1, characterized by A PH value sensor (22) is further arranged on the inner wall of the regulating tank (2), and the PH value sensor (22) is connected with an external monitoring terminal.

4. The waste acid recovery treatment apparatus according to claim 1, characterized by The condenser (7) adopts a shell-and-tube heat exchanger structure, the condenser (7) is connected with the liquid inlet end of the top of the distillation tower (5) through a reflux pipe (23), a purified water discharge pipe (24) is further arranged on the condenser (7), and a second regulating valve (26) is arranged on the purified water discharge pipe (24).

5. The waste acid recovery treatment apparatus according to claim 1, characterized by Strong acid cation exchange resin is filled in the ion exchange resin column (10), and granular activated carbon is filled in the activated carbon adsorption column (11).

6. The waste acid recovery treatment apparatus according to claim 1, characterized by A first regulating valve (25) is arranged on the outside of the waste acid inlet pipe (3), and a third regulating valve (27) is arranged on the discharge pipe (17).

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