CN211004942U - Zero discharge system for electrolytic aluminum desulfurization wastewater - Google Patents
Zero discharge system for electrolytic aluminum desulfurization wastewater Download PDFInfo
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- CN211004942U CN211004942U CN201921432149.1U CN201921432149U CN211004942U CN 211004942 U CN211004942 U CN 211004942U CN 201921432149 U CN201921432149 U CN 201921432149U CN 211004942 U CN211004942 U CN 211004942U
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Abstract
The utility model discloses an electrolytic aluminum desulfurization waste water zero discharge system. The device comprises a wet desulphurization tower, a concentration tower, a neutralization tank and a filter press; an electrolytic flue gas flue is communicated with the wet desulphurization tower through a first communicating pipeline; the side wall of the concentration tower is communicated with the electrolysis flue gas flue through a second communicating pipeline, the top end of the concentration tower is communicated with the wet desulphurization tower through a third communicating pipeline, and the bottom end of the concentration tower is communicated with the neutralization tank through a fourth communicating pipeline; an induced draft fan is arranged on the second communicating pipeline; the neutralization tank is communicated with the filter press through a fifth communication pipeline; and the wet desulphurization tower is communicated with the concentration tower through a sixth communication pipeline. The utility model has the advantages of high efficiency, low investment and low cost.
Description
Technical Field
The utility model relates to the technical field of wastewater treatment, in particular to a method and a system for zero discharge of electrolytic aluminum desulfurization wastewater.
Background
Aluminum is a key base metal material of '2025 made in China', and the aluminum industry has been rapidly developed since the construction of China with the strong support of China. China has become the world's largest country for producing electrolytic aluminum at present. However, in the aluminum electrolysis production process, a large amount of harmful substances such as CO2, perfluorocarbon, hydrogen fluoride, sulfur dioxide, dust and asphalt volatile matters are generated, and the wastes are not effectively treated, so that serious environmental and ecological problems are caused.
The environmental protection department promulgates and implements aluminum industry pollutant emission standard (GB25465-2010) modification list at the end of 2013, and the emission standard of pollutants, particularly acid gases such as SO2 and HF, is improved. Therefore, the modification of the flue gas purification system is urgently carried out in a plurality of factories in the electrolytic aluminum industry.
The most effective way to remove hydrogen fluoride and sulfur dioxide is currently wet desulfurization. The limestone-gypsum wet desulphurization system is one of wet desulphurization, is the standard desulphurization process technology which is most widely applied and has the most mature process technology in the world at present, and in the wet desulphurization process, in order to maintain the material balance of a slurry system of a desulphurization device, prevent the soluble part (mainly the concentration of chloride ions) of flue gas from not exceeding a specified value and ensure the quality of gypsum, the limestone/gypsum wet desulphurization system must discharge waste water. The desulfurization waste water belongs to the high salt waste water that contains, because the original waste water of electrolytic aluminum factory mainly is domestic waste water and mechanical cooling water, does not possess high salt waste water treatment ability in the factory, consequently the desulfurization waste water simply handles back also can't be to outer emission, becomes the problem that needs the solution after the electrolytic aluminum desulfurization urgently. The existing methods for treating the desulfurization wastewater, such as membrane concentration, MVR and other equipment, have high investment cost and high operating cost, and undoubtedly increase the operating cost of an electrolytic aluminum plant.
Therefore, the development of an electrolytic aluminum desulfurization wastewater discharge system with low investment and low operation cost is needed.
Disclosure of Invention
The utility model aims at providing an electrolytic aluminum desulfurization waste water zero discharge system, high efficiency, low input, low running cost.
In order to realize the purpose, the technical scheme of the utility model is that: the electrolytic aluminum desulfurization wastewater zero-discharge system comprises a wet desulfurization tower, wherein an electrolytic flue gas flue is communicated with the wet desulfurization tower through a first communication pipeline; the method is characterized in that: the device also comprises a concentration tower, a neutralization tank and a filter press;
the side wall of the concentration tower is communicated with the electrolysis flue gas flue through a second communicating pipeline, the top end of the concentration tower is communicated with the wet desulphurization tower through a third communicating pipeline, and the bottom end of the concentration tower is communicated with the neutralization tank through a fourth communicating pipeline;
an induced draft fan is arranged on the second communicating pipeline;
the neutralization tank is communicated with the filter press through a fifth communication pipeline;
and the wet desulphurization tower is communicated with the concentration tower through a sixth communication pipeline.
In the technical scheme, a demister, a spraying layer and a magnetic separator are arranged in the concentration tower;
the demister is arranged at the top end of the concentration tower;
the spraying layer is arranged at the upper part of the concentration tower;
the magnetic separator is arranged at the lower part of the concentration tower.
In the technical scheme, one end of the sixth communication pipeline is communicated with the lower part of the side wall of the wet desulphurization tower, and the other end of the sixth communication pipeline is communicated with the spraying layer;
a waste water pump is arranged on the sixth communicating pipeline;
the spraying layer is at least provided with one layer.
In the technical scheme, one end of a circulating pipeline is communicated with the lower part of the side wall of the concentration tower, and the other end of the circulating pipeline is communicated with the spraying layer;
and the circulating pump is arranged on the circulating pipeline.
In the technical scheme, the upper end of the filter press is communicated with the spraying layer through a seventh communication pipeline;
and the filtrate pump is arranged on the seventh communicating pipeline.
In the technical scheme, a thick slurry pump is arranged on the fourth communicating pipeline;
and the filter press feed pump is arranged on the fifth communicating pipeline.
The utility model has the advantages that;
(1) the utility model has the characteristics of high efficiency, low investment and low operation cost, does not need to add an auxiliary heat source, and can realize zero emission of the desulfurization wastewater; the problems of difficult treatment of high-salt wastewater, high investment cost and high operation cost in factories in the conventional electrolytic aluminum industry are solved;
(2) the water content of the high-temperature flue gas of the electrolytic aluminum is very small, so that the electrolytic aluminum has very strong water vapor carrying capacity; the utility model utilizes the high-temperature flue gas before wet desulphurization to carry out evaporation concentration decrement on the desulphurization waste water, and can realize the heat utilization of the waste high-temperature flue gas; in addition, the water content of the flue gas is increased in the process of evaporating the desulfurization wastewater, so that the water consumption of the wet desulfurization tower is reduced (namely, the water in the concentration tower is evaporated into the original flue gas, so that the water consumption of the wet desulfurization tower is reduced; the utility model utilizes the waste heat of high-temperature flue gas, and has lower investment and operation cost;
(3) the utility model discloses utilize in the high temperature flue gas of concentrated desulfurization waste water and fill in the concentrated tower and contact, can realize the washing to the flue gas to a certain extent, and the absorption to the acid material, get into wet flue gas desulfurization tower system after mixing with former electrolysis flue gas, can reduce the deacidification load of wet flue gas desulfurization tower to a certain extent, and then reduce the emission of desulfurization waste water, and can not cause adverse effect to wet flue gas desulfurization tower system;
(4) the utility model discloses a concentration tower bottom adopts magnetic separation to divide into two upper and lower districts (concentrated district and crystallization district) with the thick liquid layer, the thick liquid in concentrated district disperses into a lot of fog drops through slurry circulating pump and spray set, with the abundant contact of the hot flue gas that gets into the concentrated tower, rapid evaporation concentration, thick liquid density after the concentration is great, more tend to deposit toward the crystallization district through the magnetic separator, because the evaporation of moisture, some salinity in the desulfurization waste water reaches saturated concentration, appear in the crystallization district, the magnetic separation device can also avoid the salt that has crystallized to mix back to the concentrated district, reduce the wearing and tearing of solid to pump and pipeline etc.;
(5) according to the analysis to electrolytic aluminum wet flue gas desulfurization waste water, the utility model discloses the salt that precipitates in the concentrated tower is mainly magnesium sulfate and calcium sulfate, and adds lime neutralizing agent, enables waste water and generates the magnesium hydrate that is more difficult to hold, and the calcium ion that adds can further precipitate the sulfate radical to improve the treatment effeciency of pressure filter, accelerated the circulation of salt in processing system, and then improve the efficiency of waste water zero release.
The utility model utilizes the high-temperature waste flue gas of the electrolytic aluminum to carry out evaporation concentration treatment on the waste water so as to realize the heat utilization of the waste high-temperature flue gas, and simultaneously, because the process make-up water of a desulphurization device is replaced by other waste water, the water consumption of a wet desulphurization tower is reduced, and the purpose of waste treatment by waste is realized; because the moisture of the wastewater is evaporated in the concentration tower, the zero discharge of the desulfurization wastewater is realized; in addition, the device does not consume an additional heat source, and has lower investment and operation cost; the utility model discloses a use of magnetic separator can promote the crystallization of salt, accelerates the discharge of salt from the system, improves the efficiency of waste water zero release.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In fig. 1, a represents a neutralizing agent added to a neutralization tank; and B represents outward transport.
In the figure, 1-an electrolytic flue gas flue, 2-an induced draft fan, 3-a demister, 4-a concentration tower, 5-a magnetic separator, 6-a spray layer, 7-a circulating pump, 8-a underflow pump, 9-a neutralization tank, 10-a filter press feed pump, 11-a filter press, 12-a filtrate pump, 13-a wastewater pump, 14-a wet desulfurization tower, 15-a chimney, 16-a first communicating pipeline, 17-a second communicating pipeline, 18-a third communicating pipeline, 19-a fourth communicating pipeline, 20-a fifth communicating pipeline, 21-a sixth communicating pipeline, 22-a circulating pipeline and 23-a seventh communicating pipeline.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings, which are not intended to limit the present invention, but are merely exemplary. While the advantages of the invention will be clear and readily appreciated by the description.
Referring to FIG. 1: the electrolytic aluminum desulfurization wastewater zero-discharge system comprises a wet desulfurization tower 14, wherein an electrolytic flue gas flue 1 is communicated with the wet desulfurization tower 14 through a first communication pipeline 16; also comprises a concentration tower 4, a neutralization tank 9 and a filter press 11;
the side wall of the concentration tower 4 is communicated with the electrolytic flue gas flue 1 through a second communicating pipeline 17, the top end of the concentration tower is communicated with the wet desulphurization tower 14 through a third communicating pipeline 18, and the bottom end of the concentration tower is communicated with the neutralization tank 9 through a fourth communicating pipeline 19; the high-temperature flue gas before wet desulphurization is used for evaporating, concentrating and reducing the desulphurization waste water, so that the heat utilization of the waste high-temperature flue gas can be realized, and in addition, the water content of the flue gas is increased in the evaporation process of the desulphurization waste water, so that the water consumption of a wet desulphurization tower is reduced; the utility model utilizes the waste heat of high-temperature flue gas, and has lower investment and operation cost;
an induced draft fan 2 is arranged on the second communicating pipeline 17; part of the electrolysis flue gas enters a concentration tower after being pressurized by an induced draft fan, the flue gas is contacted with the slurry continuously and circularly sprayed in the concentration tower to take away a large amount of moisture, and the saturated flue gas at the outlet of the concentration tower is led back to the front flue of the wet desulphurization tower;
the neutralization tank 9 is communicated with the filter press 11 through a fifth communication pipeline 20; according to the analysis of the electrolytic aluminum wet desulphurization wastewater, the salt separated out in the concentration tower is mainly magnesium sulfate and calcium sulfate, and lime neutralizing agent is added into the neutralization tank 9, so that the wastewater can generate magnesium hydroxide which is difficult to dissolve, and the added calcium ions can further precipitate sulfate radicals; thereby improving the treatment efficiency of the filter press, accelerating the circulation of salts in a treatment system and further improving the efficiency of zero discharge of wastewater;
the wet desulphurization tower 14 is communicated with the concentration tower 4 through a sixth communication pipeline 21; the outlet end of the wet desulphurization tower 14 is communicated with a chimney 15;
furthermore, a demister 3, a spraying layer 6 and a magnetic separator 5 are arranged in the concentration tower 4;
the demister 3 is arranged at the top end of the concentration tower 4;
the spraying layer 6 is arranged at the upper part of the concentration tower 4 and is positioned below the demister 3; the spraying layer 6 is used for fully contacting the high-temperature flue gas of the concentrated desulfurization wastewater with the desulfurization wastewater in the concentration tower, can realize the washing of the flue gas and the absorption of acidic substances to a certain extent, and enters the wet desulfurization tower system after being mixed with the original electrolysis flue gas, so that the deacidification load of the wet desulfurization tower can be reduced to a certain extent, the emission of the desulfurization wastewater is further reduced, and the adverse effect on the wet desulfurization tower system is avoided;
the magnetic separator 5 is arranged at the lower part of the concentration tower 4 and is positioned below the concentration tower; the bottom of the concentration tower adopts magnetic separation to divide a slurry layer into an upper area and a lower area, a concentration area and a crystallization area, slurry in the concentration area is dispersed into a plurality of small fog drops through a slurry circulating pump and a spraying device, the small fog drops are fully contacted with hot flue gas entering the concentration tower, the evaporation and the concentration are rapid, the density of the concentrated slurry is higher, and the concentrated slurry is more prone to depositing to the crystallization area through a magnetic separator; due to the evaporation of water, part of salt in the desulfurization wastewater reaches saturated concentration and is separated out in a crystallization area, and the magnetic separation device can also prevent the crystallized salt from being back-mixed to a concentration area, so that the abrasion of solid matters on pumps, pipelines and the like is reduced; the use of the magnetic separator and the addition of the neutralizing agent promote the crystallization of salts, accelerate the discharge of the salts from the system and improve the working efficiency of zero discharge of wastewater.
Further, one end of the sixth communicating pipe 21 is communicated with the lower part of the side wall of the wet desulphurization tower 14, and the other end is communicated with the spray layer 6; the sixth communicating pipeline 21 leads the desulfurization wastewater in the wet desulfurization tower 14 into the spray layer 6 for concentration;
a waste water pump 13 is arranged on the sixth communicating pipeline 21; the waste water pump 13 pumps the desulfurization waste water at the lower part of the wet desulfurization tower 14 into the spray layer 6, and the waste water pump pumps the desulfurization waste water into the concentration tower in a spray mode; concentrating the desulfurization wastewater in a concentration tower 4, evaporating the moisture of the desulfurization wastewater into the original flue gas, concentrating and crystallizing the slurry, and transporting the slurry; the device does not consume an extra heat source, and has lower investment and operation cost;
at least one layer of spraying layer 6 is arranged; the spraying layer 6 can be set according to the requirement.
Furthermore, one end of a circulating pipeline 22 is communicated with the lower part of the side wall of the concentration tower 4, and the other end is communicated with the spraying layer 6;
a circulating pump 7 is arranged on the circulating pipeline 22; the suction inlet of the circulating pump is arranged in the concentration area at the upper part of the tank separator, which is beneficial to absorbing the serous fluid in the concentration area and leading the serous fluid to be evaporated and concentrated quickly.
Further, the upper end of the filter press 11 is communicated with the spraying layer 6 through a seventh communication pipeline 23;
the filtrate pump 12 is arranged on the seventh communicating pipe 23; and collecting the filtrate formed by filter pressing through a filter pressing water tank, and pumping the filtrate back into the concentration tower through a filtrate pump for further concentration.
Further, a slurry pump 8 is provided on the fourth communicating pipe 19; part of crystallized thick slurry generated by the concentration tower is pumped to a neutralization box through the thick slurry; further separating out salt;
the filter press feeding pump 10 is arranged on the fifth communicating pipeline 20; and the filter press feeding pump sends the thick slurry in the neutralization tank to a filter press for filter pressing.
The desulfurization wastewater treatment principle of the utility model is as follows:
leading out a smoke (about 1/3 of original smoke) from the electrolysis smoke, passing through a draught fan, and then entering a wastewater concentration tower, wherein the wastewater in the concentration tower is continuously circulated and evaporated by the smoke to take away a large amount of water; mixing the flue gas at the outlet of the evaporation tower with the original electrolytic flue gas, and allowing the mixed flue gas to enter a wet desulphurization system to complete the desulphurization and deacidification processes; and (3) after the concentrated solution at the bottom of the evaporation tower reaches a certain salt concentration, the concentrated solution enters a neutralization box, slaked lime is added to neutralize the PH to about 7, the pH is conveyed to a plate-and-frame filter press through a conveying pump to be subjected to filter pressing, a filter cake is transported outwards, and the filtrate returns to a concentration tower to be continuously concentrated, so that zero emission of the desulfurization wastewater is realized.
The working process of the electrolytic aluminum desulfurization wastewater zero-discharge system is as follows:
1) the desulfurization wastewater generated by the wet desulfurization tower 14 is introduced into the spray layer 6 through the wastewater pump 13 and enters the concentration tower 4 in a spray mode;
2) part of the electrolysis flue gas enters a concentration tower 4 after being pressurized by a draught fan 2, the electrolysis flue gas is contacted with the slurry continuously and circularly sprayed in the concentration tower 4 to take away a large amount of moisture, and the saturated flue gas at the outlet of the concentration tower 4 is led back to a front flue of a wet desulphurization tower 14;
3) a spray layer 6 is arranged in the concentration tower 4 (the spray layer 6 can be provided with a plurality of layers according to requirements), and a demister 3 is arranged at the top of the concentration tower 4; the magnetic separator 5 is arranged at the bottom of the concentration tower 4, so that the slurry at the bottom can be prevented from back mixing; a suction inlet of the circulating pump 7 is arranged in a slurry concentration area at the upper part of the magnetic separator 5 in the concentration tower 4;
4) part of the crystallized thick slurry generated by the concentration tower 4 is sent to a neutralization box 9 through a thick slurry pump 8, the PH is adjusted to about 7 through adding hydrated lime, and salt is further separated out;
5) the thick slurry in the neutralization tank 9 is sent to a filter press 11 by a filter press feed pump 10 for filter pressing, and filter cakes after filter pressing fall into a mud bucket and are sent out by an automobile; the filter pressing formed filtrate is collected by a filter pressing water tank, and the filtrate is sent back to the concentration tower 4 by a filtrate pump 12 for further concentration.
In order to more clearly illustrate the advantages of the zero discharge system of the desulfurization waste water of the electrolytic aluminum of the utility model compared with the desulfurization waste water treatment structure of the prior art, the staff compares the two technical schemes, and the comparison result is as follows:
according to the upper table, the zero discharge system of electrolytic aluminum desulfurization waste water compare with the desulfurization waste water treatment structure of prior art, the input cost is lower, and the running cost is lower.
Other parts not described belong to the prior art.
Claims (6)
1. The electrolytic aluminum desulfurization wastewater zero-discharge system comprises a wet desulfurization tower (14), wherein an electrolytic flue gas flue (1) is communicated with the wet desulfurization tower (14) through a first communication pipeline (16); the method is characterized in that: the device also comprises a concentration tower (4), a neutralization tank (9) and a filter press (11);
the side wall of the concentration tower (4) is communicated with the electrolysis flue gas flue (1) through a second communicating pipeline (17), the top end of the concentration tower is communicated with the wet desulphurization tower (14) through a third communicating pipeline (18), and the bottom end of the concentration tower is communicated with the neutralization tank (9) through a fourth communicating pipeline (19);
an induced draft fan (2) is arranged on the second communicating pipeline (17);
the neutralization tank (9) is communicated with the filter press (11) through a fifth communication pipeline (20);
the wet desulphurization tower (14) is communicated with the concentration tower (4) through a sixth communication pipeline (21).
2. The electrolytic aluminum desulfurization wastewater zero-discharge system according to claim 1, characterized in that: a demister (3), a spraying layer (6) and a magnetic separator (5) are arranged in the concentration tower (4);
the demister (3) is arranged at the top end of the concentration tower (4);
the spraying layer (6) is arranged at the upper part of the concentration tower (4);
the magnetic separator (5) is arranged at the lower part of the concentration tower (4).
3. The electrolytic aluminum desulfurization wastewater zero-discharge system according to claim 2, characterized in that: one end of the sixth communication pipeline (21) is communicated with the lower part of the side wall of the wet desulphurization tower (14), and the other end of the sixth communication pipeline is communicated with the spraying layer (6);
a waste water pump (13) is arranged on the sixth communication pipeline (21);
the spraying layer (6) is at least provided with one layer.
4. The electrolytic aluminum desulfurization wastewater zero-discharge system according to claim 3, characterized in that: one end of a circulating pipeline (22) is communicated with the lower part of the side wall of the concentration tower (4), and the other end of the circulating pipeline is communicated with the spraying layer (6);
a circulating pump (7) is arranged on the circulating pipeline (22).
5. The electrolytic aluminum desulfurization wastewater zero-discharge system according to claim 4, characterized in that: the upper end of the filter press (11) is communicated with the spraying layer (6) through a seventh communication pipeline (23);
a filtrate pump (12) is arranged on the seventh communication pipeline (23).
6. The electrolytic aluminum desulfurization wastewater zero-discharge system according to claim 5, characterized in that: a thick slurry pump (8) is arranged on the fourth communicating pipeline (19);
the filter press feeding pump (10) is arranged on the fifth communicating pipeline (20).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921432149.1U CN211004942U (en) | 2019-08-30 | 2019-08-30 | Zero discharge system for electrolytic aluminum desulfurization wastewater |
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| CN201921432149.1U CN211004942U (en) | 2019-08-30 | 2019-08-30 | Zero discharge system for electrolytic aluminum desulfurization wastewater |
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