CN109761409B - Method and device for treating acidic heavy metal wastewater by tower-type vulcanization method - Google Patents
Method and device for treating acidic heavy metal wastewater by tower-type vulcanization method Download PDFInfo
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- CN109761409B CN109761409B CN201910229432.2A CN201910229432A CN109761409B CN 109761409 B CN109761409 B CN 109761409B CN 201910229432 A CN201910229432 A CN 201910229432A CN 109761409 B CN109761409 B CN 109761409B
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- 239000002351 wastewater Substances 0.000 title claims abstract description 43
- 238000004073 vulcanization Methods 0.000 title claims abstract description 42
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 32
- 230000002378 acidificating effect Effects 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000006243 chemical reaction Methods 0.000 claims abstract description 144
- 229910052979 sodium sulfide Inorganic materials 0.000 claims abstract description 31
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000010521 absorption reaction Methods 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 23
- 239000002244 precipitate Substances 0.000 claims description 21
- 229910052976 metal sulfide Inorganic materials 0.000 claims description 19
- 238000010517 secondary reaction Methods 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims 1
- 238000004065 wastewater treatment Methods 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 abstract description 9
- 230000009977 dual effect Effects 0.000 abstract description 3
- 238000003541 multi-stage reaction Methods 0.000 abstract description 3
- 238000005987 sulfurization reaction Methods 0.000 description 5
- 239000010842 industrial wastewater Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- HYHCSLBZRBJJCH-UHFFFAOYSA-M sodium hydrosulfide Chemical compound [Na+].[SH-] HYHCSLBZRBJJCH-UHFFFAOYSA-M 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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Abstract
The invention relates to a device and a method for treating acidic heavy metal wastewater by a tower-type vulcanization method, wherein the device sequentially comprises the following components from bottom to top: the device comprises a first-stage reaction tank, a second-stage reaction tank, a third-stage reaction tank, a fourth-stage reaction tank, a fifth-stage reaction tank and a sixth-stage reaction tank; the upper air outlet pipe of the six-stage reaction tank is connected with a gas absorption device and is provided with a wastewater inlet; and a wastewater outlet and a sodium sulfide feeding port are arranged at the lower part of the primary reaction tank. The device for treating the acidic heavy metal wastewater by the tower-type vulcanization method adopts the dual vulcanizing agent to cooperatively treat the acidic heavy metal wastewater, and treats the H difficult to treat on the basis of the traditional vulcanization method2S gas continuously flows in the tower to be used as a vulcanizing agent for a vulcanization reaction, and only a small amount of H is discharged from the top of the tower or even H is not discharged from the top of the tower after the multi-stage reaction2And (4) S gas.
Description
Technical Field
The invention belongs to the technical field of water pollution control, and particularly relates to a method and a device for treating acidic heavy metal wastewater by a tower-type vulcanization method.
Background
With the advance of the industrialization process, a large amount of industrial wastewater is generated in the industries of mines, metallurgy, electrolysis, leather making and the like, the industrial wastewater has high acidity, contains heavy metal ions such as copper, lead, zinc, mercury and the like, and is recycled or discharged after reaching the standard after being treated. The sulfuration method is used for treating the acidic wastewater, and the acidic wastewater is converted into insoluble or insoluble metal sulfide precipitate through the combination of a vulcanizing agent and metal ions. The vulcanizing agent used in a large amount is Na2S、NaHS、H2S, CaS, etc. But S is S when the vulcanizing agent is used for treating the acidic wastewater2-The heavy metal ions are combined to form precipitate, and simultaneously the precipitate and H are combined+Combine to generate a large amount of highly toxic H2And S gas is not beneficial to the health of operators.
Disclosure of Invention
The invention aims to provide a device for treating acidic heavy metal wastewater by a tower-type vulcanization method.
The invention relates to a device for treating acidic heavy metal wastewater by a tower-type vulcanization method, which sequentially comprises the following components from bottom to top: the device comprises a first-stage reaction tank, a second-stage reaction tank, a third-stage reaction tank, a fourth-stage reaction tank, a fifth-stage reaction tank and a sixth-stage reaction tank; the upper air outlet pipe of the six-stage reaction tank is connected with a gas absorption device and is provided with a wastewater inlet; and a wastewater outlet and a sodium sulfide feeding port are arranged at the lower part of the primary reaction tank.
The device for treating the acidic heavy metal wastewater by the tower-type vulcanization method adopts the dual vulcanizing agent to cooperatively treat the acidic heavy metal wastewater, and treats the H difficult to treat on the basis of the traditional vulcanization method2S gas continuously flows in the tower to be used as a vulcanizing agent for a vulcanization reaction, and only a small amount of H is discharged from the top of the tower or even H is not discharged from the top of the tower after the multi-stage reaction2And (4) S gas. The acidic heavy metal wastewater continuously flowing down from the top of the tower is firstly mixed with H in each stage of 1 reaction tank2S gas undergoes a sulfuration reaction until the S gas flows into the first-stage reaction tank to continue reacting with Na2S is subjected to a vulcanization reaction, so that each stage of reaction tank of the whole tower can be fully subjected to the vulcanization reaction.
In addition, the device for treating the acidic heavy metal wastewater by the tower-type vulcanization method can also have the following additional technical characteristics:
in a preferred embodiment of the invention, the tower-type sulfurization device for treating acidic heavy metal wastewater is characterized in that an exhaust pipe is arranged at the upper part of each stage of reaction tank, and the exhaust pipe of each stage of reaction tank is connected and arranged below the liquid level of the previous stage of reaction tank.
In a preferred embodiment of the invention, the tower-type sulfurization device for treating acidic heavy metal wastewater is characterized in that a drain pipe is arranged at the lower part of each stage of reaction tank, and the drain pipe of each stage of reaction tank is connected to the upper part of the next stage of reaction tank.
The invention also aims to provide a method for treating the acidic heavy metal wastewater by using the tower-type vulcanization method.
The method for treating the acidic heavy metal wastewater by using the device comprises the following steps: s101: acid heavy metal wastewater is introduced from a wastewater inlet at the upper part of the six-stage reaction tank, and sodium sulfide is introduced through a sodium sulfide inlet of the first-stage reaction tank; s102: the acidic heavy metal wastewater flows into a five-stage reaction tank and a four-stage reaction tank from a six-stage reaction tank in sequenceThe reaction tank, the third-stage reaction tank and the second-stage reaction tank flow into the first-stage reaction tank to perform a vulcanization reaction with sodium sulfide to generate metal sulfide precipitate and simultaneously escape H2S gas; s103: the H produced in the first-stage reaction tank2S gas is introduced into the liquid level of the secondary reaction tank through the exhaust pipe and undergoes a vulcanization reaction with sodium sulfide in the secondary reaction tank to generate metal sulfide precipitate and simultaneously escape H2S gas; the H produced in the secondary reaction tank2S gas is introduced below the liquid level of the third-stage reaction tank through the exhaust pipe and undergoes a vulcanization reaction with sodium sulfide in the third-stage reaction tank to generate metal sulfide precipitate and simultaneously escape H2S gas; the H generated in the three-stage reaction tank2S gas is introduced into the liquid level of the four-stage reaction tank through the exhaust pipe and undergoes a vulcanization reaction with sodium sulfide in the four-stage reaction tank to generate metal sulfide precipitate and simultaneously escape H2S gas; the H produced in the four-stage reaction tank2S gas is introduced below the liquid level of the five-stage reaction tank through the exhaust pipe and undergoes a vulcanization reaction with sodium sulfide in the five-stage reaction tank to generate metal sulfide precipitate and simultaneously escape H2S gas; the H generated in the five-stage reaction tank2S gas is introduced below the liquid level of the six-stage reaction tank through the exhaust pipe and undergoes a vulcanization reaction with sodium sulfide in the six-stage reaction tank to generate metal sulfide precipitate and simultaneously escape H2And introducing the S gas into the gas absorption device.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
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FIG. 1 is a device for treating acidic heavy metal wastewater by a tower-type vulcanization method.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In a first aspect, the invention provides a device for treating acidic heavy metal wastewater by a tower-type vulcanization method, which sequentially comprises the following components from bottom to top: the device comprises a first-stage reaction tank, a second-stage reaction tank, a third-stage reaction tank, a fourth-stage reaction tank, a fifth-stage reaction tank and a sixth-stage reaction tank; the upper air outlet pipe of the six-stage reaction tank is connected with a gas absorption device and is provided with a wastewater inlet; and a wastewater outlet and a sodium sulfide feeding port are arranged at the lower part of the primary reaction tank.
Advantageously, in the device for treating acidic heavy metal wastewater by using the tower-type vulcanization method, the upper part of each stage of reaction tank is provided with an exhaust pipe, and the exhaust pipe of each stage of reaction tank is connected and arranged below the liquid level of the upper stage of reaction tank.
Advantageously, in the device for treating acidic heavy metal wastewater by using the tower-type vulcanization method, the lower part of each stage of reaction tank is provided with a liquid discharge pipe, and the liquid discharge pipe of each stage of reaction tank is connected to the upper part of the next stage of reaction tank.
In a second aspect, the invention provides a method for treating acidic heavy metal wastewater by using the device, which comprises the following steps:
(1) acid heavy metal wastewater is introduced from a wastewater inlet at the upper part of the six-stage reaction tank, and sodium sulfide is introduced through a sodium sulfide inlet of the first-stage reaction tank.
(2) The acidic heavy metal wastewater flows into a five-stage reaction tank, a four-stage reaction tank, a three-stage reaction tank and a two-stage reaction tank from a six-stage reaction tank in sequence, and finally flows into the first-stage reaction tank to perform a vulcanization reaction with sodium sulfide to generate metal sulfide precipitate and simultaneously escape H2And (4) S gas.
(3) The H produced in the first-stage reaction tank2S gas is introduced into the liquid level of the secondary reaction tank through the exhaust pipe and undergoes a vulcanization reaction with sodium sulfide in the secondary reaction tank to generate metal sulfide precipitate and simultaneously escape H2S gas; the H produced in the secondary reaction tank2S gas is introduced below the liquid level of the third-stage reaction tank through the exhaust pipe and undergoes a vulcanization reaction with sodium sulfide in the third-stage reaction tank to generate metal sulfide precipitate and simultaneously escape H2S gas; the H generated in the three-stage reaction tank2S gas is introduced into the liquid level of the four-stage reaction tank through the exhaust pipe and undergoes a vulcanization reaction with sodium sulfide in the four-stage reaction tank to generate metal sulfide precipitate and simultaneously escape H2S gas; the H produced in the four-stage reaction tank2S gas is introduced below the liquid level of the five-stage reaction tank through the exhaust pipe and undergoes a vulcanization reaction with sodium sulfide in the five-stage reaction tank to generate metal sulfide precipitate and simultaneously escape H2S gas; the H generated in the five-stage reaction tank2S gas is introduced below the liquid level of the six-stage reaction tank through the exhaust pipe and undergoes a vulcanization reaction with sodium sulfide in the six-stage reaction tank to generate metal sulfide precipitate and simultaneously escape H2And introducing the S gas into the gas absorption device.
In conclusion, the method for treating the acidic heavy metal wastewater by adopting the dual vulcanizing agent in a synergistic manner disclosed by the invention is used for treating the H difficult to treat on the basis of the traditional vulcanizing method2S gas continuously flows in the tower to be used as a vulcanizing agent for a vulcanization reaction, and only a small amount of H is discharged from the top of the tower or even H is not discharged from the top of the tower after the multi-stage reaction2And (4) S gas. The acidic heavy metal wastewater continuously flowing down from the top of the tower is firstly mixed with H in each stage of 1 reaction tank2S gas undergoes a sulfuration reaction until the S gas flows into the first-stage reaction tank to continue reacting with Na2S is subjected to a vulcanization reaction, so that each stage of reaction tank of the whole tower can be fully subjected to the vulcanization reaction.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (1)
1. A wastewater treatment method of a device for treating acidic heavy metal wastewater based on a tower-type vulcanization method is characterized in that the device sequentially comprises the following components from bottom to top: the device comprises a first-stage reaction tank, a second-stage reaction tank, a third-stage reaction tank, a fourth-stage reaction tank, a fifth-stage reaction tank and a sixth-stage reaction tank; the upper gas outlet pipe of the six-stage reaction tank is connected with a gas absorption device and is provided with a waste liquid inlet; a wastewater outlet and a sodium sulfide feed inlet are formed in the lower part of the primary reaction tank;
the upper part of each stage of reaction tank is provided with an exhaust pipe, and the exhaust pipe of each stage of reaction tank is connected and arranged below the liquid level of the previous stage of reaction tank;
the lower part of each stage of reaction tank is provided with a liquid discharge pipe, and the liquid discharge pipe of each stage of reaction tank is connected to the upper part of the next stage of reaction tank;
the method comprises the following steps:
s101: acid heavy metal wastewater is introduced from a wastewater inlet at the upper part of the six-stage reaction tank, and sodium sulfide is introduced through a sodium sulfide inlet of the first-stage reaction tank;
s102: the acidic heavy metal wastewater flows into a five-stage reaction tank, a four-stage reaction tank, a three-stage reaction tank and a two-stage reaction tank from a six-stage reaction tank in sequence, and finally flows into the first-stage reaction tank to perform a vulcanization reaction with sodium sulfide to generate metal sulfide precipitate and simultaneously escape H2S gas;
s103: the H produced in the first-stage reaction tank2S gas is introduced into the liquid level of the secondary reaction tank through the exhaust pipe and undergoes a vulcanization reaction with sodium sulfide in the secondary reaction tank to generate metal sulfide precipitate and simultaneously escape H2S gas; the H produced in the secondary reaction tank2S gas channelThe gas passing through the exhaust pipe is introduced below the liquid level of the third-stage reaction tank and undergoes a vulcanization reaction with sodium sulfide in the third-stage reaction tank to generate metal sulfide precipitate and simultaneously escape H2S gas; the H generated in the three-stage reaction tank2S gas is introduced into the liquid level of the four-stage reaction tank through the exhaust pipe and undergoes a vulcanization reaction with sodium sulfide in the four-stage reaction tank to generate metal sulfide precipitate and simultaneously escape H2S gas; the H produced in the four-stage reaction tank2S gas is introduced below the liquid level of the five-stage reaction tank through the exhaust pipe and undergoes a vulcanization reaction with sodium sulfide in the five-stage reaction tank to generate metal sulfide precipitate and simultaneously escape H2S gas; the H generated in the five-stage reaction tank2S gas is introduced below the liquid level of the six-stage reaction tank through the exhaust pipe and undergoes a vulcanization reaction with sodium sulfide in the six-stage reaction tank to generate metal sulfide precipitate and simultaneously escape H2And introducing the S gas into the gas absorption device.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101381074A (en) * | 2007-09-06 | 2009-03-11 | 株式会社东芝 | Heavy metal collection system and heavy metal collection method |
| CN101928083A (en) * | 2010-09-28 | 2010-12-29 | 同济大学 | Method for treatment of wastewater containing heavy metal molybdenum |
| CN102502993A (en) * | 2011-11-08 | 2012-06-20 | 株洲圣达资源循环科技有限公司 | Method for treating acidic heavy metal wastewater and recycling treated wastewater |
| CN107417008A (en) * | 2017-08-08 | 2017-12-01 | 云锡文山锌铟冶炼有限公司 | Smelt SO2The method that spent acid is handled during flue gas acid preparing |
| CN207210142U (en) * | 2017-08-25 | 2018-04-10 | 金川集团股份有限公司 | A kind of system for handling metallurgical off-gas acid-making acid waste water |
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2019
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101381074A (en) * | 2007-09-06 | 2009-03-11 | 株式会社东芝 | Heavy metal collection system and heavy metal collection method |
| CN101928083A (en) * | 2010-09-28 | 2010-12-29 | 同济大学 | Method for treatment of wastewater containing heavy metal molybdenum |
| CN102502993A (en) * | 2011-11-08 | 2012-06-20 | 株洲圣达资源循环科技有限公司 | Method for treating acidic heavy metal wastewater and recycling treated wastewater |
| CN107417008A (en) * | 2017-08-08 | 2017-12-01 | 云锡文山锌铟冶炼有限公司 | Smelt SO2The method that spent acid is handled during flue gas acid preparing |
| CN207210142U (en) * | 2017-08-25 | 2018-04-10 | 金川集团股份有限公司 | A kind of system for handling metallurgical off-gas acid-making acid waste water |
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