CN218155574U - Acidizing calcination flue gas processing system - Google Patents

Acidizing calcination flue gas processing system Download PDF

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CN218155574U
CN218155574U CN202221972619.5U CN202221972619U CN218155574U CN 218155574 U CN218155574 U CN 218155574U CN 202221972619 U CN202221972619 U CN 202221972619U CN 218155574 U CN218155574 U CN 218155574U
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flue gas
absorption device
heat exchanger
liquid
dust remover
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唐建文
杜国山
刘振举
陈贵娥
周文龙
羡鹏飞
徐月和
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China ENFI Engineering Corp
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China ENFI Engineering Corp
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Abstract

The utility model discloses an acidizing calcination flue gas processing system belongs to lithium ore stone and carries lithium tail gas processing technology field. The system comprises a heat exchanger, a dust remover, a primary absorption device and a secondary absorption device which are sequentially connected, wherein an inlet of the heat exchanger is connected with a flue gas outlet of the acidification roasting rotary kiln, and the heat exchanger is connected with a first water pump used for conveying a cooling medium to the heat exchanger; the dust remover is connected with a second water pump used for sending cooling liquid required by dust removal to the dust remover; the primary absorption device is connected with a circulating spray pump for conveying the spray liquid to the primary absorption device and recycling the spray liquid, and the spray liquid is used for absorbing acidic substances in the flue gas; and the secondary absorption device is connected with a fourth water pump for conveying the washing liquid to the secondary absorption device, and the washing liquid is used for washing and absorbing the flue gas to produce tail gas. Adopt the utility model discloses can handle acidic material and particulate matter in the spodumene concentrate acidizing calcination flue gas more high-efficiently, do benefit to serialization production and handle, handle the back tail gas and satisfy emission standard.

Description

Acidizing calcination flue gas processing system
Technical Field
The utility model belongs to the technical field of tail gas treatment, a acidizing calcination flue gas processing system is related to. More specifically a spodumene concentrate acidizing roasting flue gas treatment system.
Background
The sulfuric acid method is a mainstream process for extracting lithium from ores in the world at present, and the process has the advantages of high production efficiency, high lithium recovery rate and the like. In the case of spodumene, in which alpha-Li is predominant 2 O·Al 2 O 3 ·4SiO 2 Exists in a form, is not dissolved in acid and alkali, and is transformed into beta-Li at the high temperature of 1100 DEG C 2 O·Al 2 O 3 ·4SiO 2 And carrying out displacement reaction with sulfuric acid to generate soluble sulfate, and further purifying and converting the soluble sulfate into a lithium salt product. In the acidification roasting process, lithium salt production enterprises at home and abroad usually use an external heating type rotary kiln, and the generated acidification roasting flue gas not only contains excessive sulfuric acid, but also contains a small amount of spodumene dust.
For the acidized roasting flue gas, most of domestic factories adopt alkaline liquid for spraying treatment at present, the mode can reduce the tail gas to a certain extent, the tail gas contains acid and dust, but the flue gas contains dust, the operation load of a washing tower can be increased usually, the inner hole plate of the tower is blocked, the pressure difference is increased, the washing times are increased, the water consumption is increased, the maintenance period is shortened, and the continuous operation of the factories is further influenced. Meanwhile, with the improvement of environmental protection requirements, the emission standards of acid and particulate matters in the roasting tail gas are stricter and stricter, which puts higher requirements on the flue gas treatment process.
SUMMERY OF THE UTILITY MODEL
Based on this, the utility model aims to provide an acidizing calcination flue gas processing system to handle acidic material and particulate matter in spodumene concentrate acidizing calcination flue gas more high-efficiently, do benefit to serialization production, so that handle back tail gas and satisfy emission standard. The above object can be achieved by the following technical solution:
the utility model provides a pair of acidizing calcination flue gas processing system that above-mentioned embodiment provided, include: a heat exchanger, a dust remover, a primary absorption device and a secondary absorption device which are connected in sequence, wherein,
the inlet of the heat exchanger is connected with the flue gas outlet of the acidification roasting rotary kiln, and the heat exchanger is connected with a first water pump and used for conveying a cooling medium into the heat exchanger;
the dust remover is connected with a second water pump and used for sending cooling liquid required by dust removal to the dust remover;
the primary absorption device is connected with a circulating spray pump and is used for conveying spray liquid to the primary absorption device for recycling, and the primary absorption device absorbs acidic substances in the flue gas through the spray liquid;
the second-stage absorption device is connected with a fourth water pump and used for conveying washing liquid to the second-stage absorption device, and the second-stage absorption device washes and absorbs the flue gas through the washing liquid and produces dischargeable tail gas.
Optionally, the method further comprises: and the cooling device is connected between the primary absorption device and the circulating spray pump and is used for cooling the spray liquid.
Optionally, a nozzle is installed at a connection position of the dust remover and the second water pump, and the cooling liquid sent by the second water pump is atomized into liquid drops through the nozzle and then sent into the dust remover for dust removal.
Optionally, the dust separator is a wet dust separator.
Optionally, the dust separator is a venturi dust separator.
Optionally, the heat exchanger comprises a cooling coil.
Optionally, the method further comprises: the tail gas fan is connected with the outlet of the secondary absorption device and used for discharging the dischargeable tail gas in the secondary absorption device through the chimney.
Has the advantages that: the utility model discloses an adopt heat exchanger, dust remover, one-level absorbing device and second grade absorbing device to carry out the heat transfer in proper order to acidizing calcination flue gas, remove dust, the one-level absorbs and the second grade absorbs the processing for acidic material and particulate matter have satisfied emission standard in the processing back tail gas, simple structure, convenient operation and high efficiency are favorable to spodumene concentrate acidizing to carry the serialization production of lithium, carry out acidizing calcination flue gas through this system and handle the problem of having overcome among the prior art.
Drawings
Fig. 1 is a schematic structural diagram of an acidification roasting flue gas treatment system according to an embodiment of the present invention.
In the figure 1, 1 a rotary kiln for acidizing and roasting, 2 a front heat exchanger, 3 a first-stage dust remover, 4 a first-stage absorption device, 5 a second-stage absorption device, 6 a tail gas fan, 7 a chimney, 8 a first water pump, 9 a second water pump, 10 a circulating spray pump and 11 a fourth water pump.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below with reference to embodiments of the present invention, and it should be understood that the described embodiments are only some embodiments of the present invention, rather than all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.
An embodiment of the utility model provides an acidizing calcination flue gas processing system, including heat exchanger, dust remover, one-level absorbing device and second grade absorbing device. The inlet of the heat exchanger is connected with the flue gas outlet of the acidification roasting rotary kiln, and the heat exchanger is connected with a first water pump and used for conveying cooling media into the heat exchanger. And the dust remover is connected with a second water pump and used for sending cooling liquid required by dust removal to the dust remover. The primary absorption device is connected with a circulating spray pump and used for conveying spray liquid to the primary absorption device and recycling the spray liquid, and the primary absorption device absorbs acidic substances in the flue gas through the spray liquid. And the secondary absorption device is connected with a fourth water pump and is used for conveying washing liquid to the secondary absorption device, and the secondary absorption device washes and absorbs the flue gas through the washing liquid and produces tail gas.
The operation steps when the system is adopted for carrying out the treatment of the acidizing roasting flue gas are as follows: carrying out heat exchange treatment on the acidified and roasted flue gas by using a heat exchanger to obtain cooled flue gas; dedusting the cooled flue gas by a deduster through cooling liquid to obtain dedusted flue gas; absorbing acidic substances in the dedusted flue gas by using a primary absorption device through spraying liquid to obtain primary absorbed flue gas, and recycling the spraying liquid after absorption; and (4) washing and secondary absorption are carried out on the flue gas after the primary absorption by adopting a secondary absorption device through cleaning water, so that the tail gas reaching the standard is produced.
Fig. 1 schematically shows the structure of the acidification roasting flue gas treatment system of an embodiment of the present invention. The acidified roasting flue gas treatment system and the acidified roasting flue gas treatment process of this embodiment are further described below with reference to fig. 1.
As shown in fig. 1, the system for treating the acidified burned flue gas in the embodiment includes a pre-heat exchanger 2, a primary dust remover 3, a primary absorption device 4, and a secondary absorption device 5, which are connected in sequence. Further, the device also comprises a tail gas fan 6 and a chimney 7 connected with the tail gas fan, wherein the tail gas fan 6 is connected with the secondary absorption device 5. Wherein, the devices can be connected by pipelines to convey the smoke. The acidified roasting flue gas discharged from the acidified roasting rotary kiln 1 is subjected to heat exchange, dust removal, primary absorption and secondary absorption in sequence to obtain standard-reaching tail gas, and the standard-reaching tail gas is discharged into the atmosphere through a chimney 7 by a tail gas fan 6.
The front heat exchanger 2 comprises an inlet, an outlet and a cooling medium inlet. The inlet is connected with a flue gas outlet of the acidification roasting rotary kiln 1, the outlet is connected with the primary dust remover 3, the cooling medium inlet is connected with a first water pump 8, and the first water pump 8 is a cooling liquid pump and used for conveying cooling medium to the front heat exchanger 2 to exchange heat with flue gas. Wherein, the cooling medium can select industrial fresh water or washing water of other processes according to the actual production situation so as to reduce the unit consumption of production water. The heat exchange means of the pre-heat exchanger 2 is not specifically limited, and for example, an acid-resistant cooling coil may be preferred, or the temperature may be directly lowered.
The flue gas generated in the spodumene acidification roasting process has the temperature of about 260-300 ℃, and the flue gas contains sulfuric acid, dust, water vapor and a small amount of SO 2 . The temperature is high, and is not beneficial to the absorption treatment of subsequent acid substances, and the flue gas at the temperature is subjected to heat exchange through the front heat exchanger 2 so as to reduce the temperature of the flue gas.
Flue gas that comes out from the exhanst gas outlet of acidizing calcination rotary kiln 1 passes through preceding heat exchanger 2, and after contacting with cooling medium, on the one hand flue gas temperature reduces, is favorable to improving follow-up absorbing device to the absorptivity of acid material, and on the other hand can reduce partial dust content, reduces the pressure of follow-up dust remover, and then very big limit has reduced particulate matter content in the tail gas.
The primary dust remover 3 comprises an inlet, an outlet and a cooling liquid inlet. The inlet is connected with the outlet of the front heat exchanger 2, the outlet is connected with the primary absorption device 4, the cooling liquid inlet is connected with the second water pump 9, and the second water pump 9 is a washing water pump and used for conveying cooling liquid to the primary dust remover 3 so as to remove dust in a cooling liquid mode. Of course, the present invention is not limited thereto, and a multi-stage dust collector may be connected after the first-stage dust collector 3 for further dust collection. The primary dust remover 3 removes dust by adopting cooling liquid so as to control the temperature of smoke dust within a proper range.
In a preferred embodiment, a nozzle is further installed at the cooling liquid inlet of the primary dust remover 3, the cooling liquid discharged from the second water pump 9 is atomized into small droplets through the nozzle, and the small droplets enter the primary dust remover 3 to soak the particles and carry and remove most of the particles along with the dehydration process of the dust remover, so that the dust removal effect is further improved.
The dust remover is preferably a wet dust remover, and the cooling liquid is fully contacted with the dust-containing gas to wash dust particles down so as to purify the gas; for example, part of the dust can be adsorbed by the water bath, and other particles in the ascending gas can be collected by the sprayed small droplets, so that the dust removal effect is improved. Most preferably, the venturi scrubber is adopted, the flow rate of the flue gas is increased after the flue gas enters a contraction pipe of the venturi scrubber, and meanwhile, the cooling liquid from the second water pump 9 is atomized into small liquid drops through the nozzle, so that the sulfuric acid gas in the flue gas is contacted and dissolved with the small liquid drops, the particulate matters are soaked by the small liquid drops, and most of the particulate matters are removed along with the dehydration process of the scrubber.
The flue gas cooled by the front heat exchanger 2 enters the primary dust remover 3, most dust is removed in the equipment, meanwhile, the temperature of the flue gas is further reduced, and most of the physical state of acidic substances in the flue gas is converted from gas state into liquid drops with smaller particle size.
The primary absorption device 4 comprises an inlet, an outlet and a spraying liquid access port. The inlet is connected with the outlet of the primary dust remover, the outlet is connected with the secondary absorption device 5, and the spraying liquid inlet is connected with the circulating spraying pump 10, so that the spraying liquid can be recycled. The shape and the structure of the primary absorption device 4 are not limited, preferably, the inlet can be positioned at the bottom of the primary absorption device 4, the outlet is positioned at the top, the spraying liquid access port is positioned at the upper part, the gas enters the inner part from the bottom and moves upwards in the mode, and the liquid drops sprayed by the spraying liquid move downwards to make the gas fully contact with the spraying liquid, so that the absorption and purification effect is further improved. The spray liquid can be alkaline solution or industrial fresh water. For example, in combination with the main process flow of the lithium carbonate plant, the mother liquor containing sodium carbonate or the lithium bicarbonate solution generated in the carbonization and thermal precipitation process can be preferably used to make full use of the mother liquor.
In the preferred embodiment, in order to avoid the temperature rise of the spray liquid caused by the heat release in the primary absorption process, the external cooling device is used for cooling the spray liquid, so that the temperature of the flue gas entering the secondary absorption device 5 is not too high, and the operation of the secondary absorption device 5 is facilitated. The cooling device may be externally connected, for example, may be installed between the circulating spray pump 10 and the primary absorption device 4, but is not limited thereto.
The flue gas after the preposed heat exchange and the primary dust removal continuously enters the primary absorption device 4, and the circulating spray pump 10 sends the spray liquid to the primary absorption device 4, so that the flue gas reacts with the spray liquid, the acidic substances in the flue gas are further reduced, and the temperature of the flue gas is controlled within a proper range. Meanwhile, most of dust in the flue gas reaches the emission standard. In addition, a part of small liquid drops in the flue gas continue to become large liquid drops, so that conditions are created for further absorption in the secondary absorption device 5.
The secondary absorption device 5 comprises an inlet, an outlet and a washing water inlet. Wherein, the inlet is connected with the outlet of the primary absorption device 4, the outlet is connected with the inlet of the tail gas fan 6, and the outlet of the tail gas fan 6 is connected to the chimney 7. The cleaning water inlet is connected with a fourth water pump 11, the fourth water pump 11 is a cleaning pump and used for conveying cleaning water to the secondary absorption device 5, the cleaning water is used for cleaning and absorbing smoke, standard-reaching tail gas is obtained after treatment, and the tail gas is conveyed to the chimney 7 through the tail gas fan 6 and is exhausted to the atmosphere. The specific structure of the secondary absorption device 5 is not limited, and preferably, the inlet is located at the lower part of the secondary absorption device 5, the outlet is located at the top, and the washing water inlet is located at the upper part, in this way, gas enters the inside from the lower part and moves upwards, and washing water is sprayed from the upper part and moves downwards, so that the gas is fully contacted with the washing water, and the washing and absorption effects are further improved.
The dust in the flue gas after the absorption treatment by the primary absorption device 4 mostly reaches the emission standard, and the flue gas is further washed and absorbed by the secondary absorption device 5, so that the flue gas reaches the environmental emission standard (sulfuric acid is less than or equal to 50 mg/Nm) 3 The particle is less than or equal to 10mg/Nm 3 ) And finally discharged to the atmosphere through a chimney 7 by a tail gas fan 6.
The utility model provides an above-mentioned embodiment, through carrying out leading heat transfer, one-level dust removal, one-level absorption and second grade absorption in proper order to acidizing calcination flue gas and make acidic material and particulate matter reach environmental protection emission standard in handling the back flue gas, whole processing procedure is simple and high-efficient moreover, more is favorable to spodumene concentrate acidizing to carry out the serialization production of lithium, has overcome the problem that prior art exists simultaneously.
The utility model provides an in some embodiments still have following advantage:
after the acidified roasting flue gas is contacted with a cooling medium through the front heat exchanger 2, on one hand, the temperature of the flue gas is reduced, and the absorption rate of a subsequent absorption device on acidic substances is favorably improved; on the other hand, the dust content is reduced, the pressure of a subsequent dust remover is reduced, and the content of particulate matters in the tail gas is further reduced to the maximum extent.
The flue gas cooled by the front heat exchanger 2 enters a first-stage dust remover 3, most dust in the equipment is removed, simultaneously the temperature of the flue gas is further reduced, and most of the physical state of acidic substances in the flue gas is changed from gas state to liquid drops with smaller particle size.
The flue gas after heat exchange by the front heat exchanger 2 and dust removal by the primary dust remover 3 continuously enters the primary absorption device 4 to react with the spray liquid fed into the primary absorption device 4, so that acidic substances in the flue gas are further reduced, the temperature of the flue gas can be controlled within a proper range, and most of dust in the flue gas after absorption treatment by the primary absorption device 4 reaches the emission standard.
After the absorption treatment of the primary absorption device 4, part of small droplets in the flue gas continue to become large droplets, and the large droplets enter the secondary absorption device 5 to create conditions for the further absorption of the secondary absorption device 5; the secondary absorption device 5 adopts washing water to carry out absorption and absorption treatment, and the output reaches the environmental-friendly emission standard.
The description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims (7)

1. An acidizing roasting flue gas treatment system is characterized by comprising: a heat exchanger, a dust remover, a primary absorption device and a secondary absorption device which are connected in sequence, wherein,
the inlet of the heat exchanger is connected with the flue gas outlet of the acidification roasting rotary kiln, and the heat exchanger is connected with a first water pump and used for conveying a cooling medium into the heat exchanger;
the dust remover is connected with a second water pump and used for sending cooling liquid required by dust removal to the dust remover;
the primary absorption device is connected with a circulating spray pump and is used for conveying spray liquid to the primary absorption device for recycling, and the primary absorption device absorbs acidic substances in the flue gas through the spray liquid;
the second-stage absorption device is connected with a fourth water pump and used for conveying washing liquid to the second-stage absorption device, and the second-stage absorption device washes and absorbs the flue gas through the washing liquid and produces dischargeable tail gas.
2. The acidized roasting flue gas treatment system of claim 1, further comprising: and the cooling device is connected between the primary absorption device and the circulating spray pump and is used for cooling the spray liquid.
3. The acidizing roasting flue gas treatment system according to claim 1, wherein a nozzle is installed at a connection of the dust remover and the second water pump, and the nozzle is used for atomizing the cooling liquid sent out by the second water pump into liquid drops and then sending the liquid drops into the dust remover.
4. The acidizing roasting flue gas treatment system of claim 1, wherein the dust collector is a wet dust collector.
5. The acidizing roasting flue gas treatment system of claim 4, wherein the dust remover is a venturi dust remover.
6. The acidizing roasting flue gas treatment system of claim 1, wherein the heat exchanger comprises a cooling coil.
7. The acidized roasting flue gas treatment system of claim 1, further comprising: the tail gas fan is connected with the outlet of the secondary absorption device and used for discharging the dischargeable tail gas in the secondary absorption device through the chimney.
CN202221972619.5U 2022-07-28 2022-07-28 Acidizing calcination flue gas processing system Active CN218155574U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115282759A (en) * 2022-07-28 2022-11-04 中国恩菲工程技术有限公司 Method and system for treating acidified roasting flue gas

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115282759A (en) * 2022-07-28 2022-11-04 中国恩菲工程技术有限公司 Method and system for treating acidified roasting flue gas

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