CN213895219U - Magnesium recovery device of thermal power factory - Google Patents
Magnesium recovery device of thermal power factory Download PDFInfo
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- CN213895219U CN213895219U CN202023211358.9U CN202023211358U CN213895219U CN 213895219 U CN213895219 U CN 213895219U CN 202023211358 U CN202023211358 U CN 202023211358U CN 213895219 U CN213895219 U CN 213895219U
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- magnesium recovery
- magnesium
- thermal power
- recovery tank
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Abstract
The utility model provides a thermal power factory's magnesium recovery unit, the device includes desulfurizing tower, neutralization pond, magnesium recovery tank and reaction vessel, the neutralization pond is connected to the desulfurizing tower, the inlet of magnesium recovery tank is connected to the neutralization pond, the magnesium recovery tank has liquid ammonia bottle through the pipe connection, the bottom discharge gate of magnesium recovery tank is connected with magnesium recovery pond, reaction vessel is connected to the upper end liquid outlet of magnesium recovery tank, it goes into the liquid mouth to be equipped with alkali lye on the reaction vessel, the sedimentation tank is connected to reaction vessel's bottom discharge gate, the last liquid outlet that is equipped with of reaction vessel. The magnesium is recycled by introducing ammonia gas, so that the pH value of the solution is easier to control, the problem of excessive investment is avoided, and the pH value in the neutralization tank can be better controlled, so that the purity of the magnesium hydroxide is improved.
Description
Technical Field
The utility model relates to a magnesium recovery field, especially a magnesium recovery unit of thermal power factory.
Background
The water discharge of the thermal power plant is large, and most of the water can be discharged only by performing centralized treatment on the wastewater.
Wherein, for the desulfurization waste water, if limestone with higher magnesium content is used in the desulfurization system, the magnesium ion content in the desulfurization waste water is higher. The high content of magnesium ions brings inconvenience to subsequent treatment, and if magnesium is recovered, particularly high-purity recovery is realized, the magnesium can be further utilized.
However, in the prior art, magnesium ions are recovered in the form of magnesium hydroxide precipitate by adding alkali liquor, because the adding is too fast or the solution in the neutralization tank is too much, the alkali liquor cannot be sufficiently mixed with the solution in the neutralization tank, the detected pH value in the neutralization tank is lower, the adding of the alkali liquor is continued, the adding of the alkali liquor is too much, the pH value in the neutralization tank reaches the pH value at which calcium ions begin to precipitate, the recovered magnesium hydroxide is doped with calcium hydroxide, and the purity of the magnesium hydroxide is reduced.
The magnesium is recycled by introducing ammonia gas, so that the pH value of the solution is easier to control, the problem of excessive investment is solved, and the pH value in the neutralization tank can be better controlled.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's not enough, provide a magnesium recovery unit of thermal power factory, change in the pH value of accuse solution, can improve magnesium hydrate's purity.
The purpose of the utility model is realized through the following technical scheme:
the utility model provides a thermal power factory's magnesium recovery unit, the device includes desulfurizing tower, neutralization pond, magnesium recovery tank and reaction vessel, the neutralization pond is connected to the desulfurizing tower, the inlet of magnesium recovery tank is connected to the neutralization pond, the magnesium recovery tank has liquid ammonia bottle through the pipe connection, the bottom discharge gate of magnesium recovery tank is connected with magnesium recovery pond, reaction vessel is connected to the upper end liquid outlet of magnesium recovery tank, it goes into the liquid mouth to be equipped with alkali lye on the reaction vessel, the sedimentation tank is connected to reaction vessel's bottom discharge gate, the last liquid outlet that is equipped with of reaction vessel.
Further, the reaction vessel is a reaction tank, a gas outlet at the top of the reaction tank is connected with an ammonia gas storage device through a pipeline, the ammonia gas storage device is connected with the magnesium recovery tank through a pipeline, and valves are arranged on the pipelines.
Furthermore, a heating device is arranged on the reaction tank.
Further, a pressure reducing valve is arranged between the liquid ammonia bottle and the magnesium recovery tank.
Further, valves are arranged on the liquid inlet, the bottom end discharge port and the upper end liquid outlet of the magnesium recovery tank; and valves are arranged on the alkali liquor inlet, the bottom discharge hole and the liquor outlet of the reaction tank.
Further, an ammonia gas conveying fan is arranged on a pipeline between the ammonia gas storage device and the magnesium recovery tank, and the ammonia gas conveying fan conveys ammonia gas in the ammonia gas storage device into the magnesium recovery tank.
Further, the neutralization pond, the magnesium recovery tank and the reaction tank are all provided with online pH detectors.
Further, the online pH detector is electrically connected to the same controller.
Further, the liquid outlet is connected with a subsequent treatment pool.
The utility model has the advantages that:
the method has the advantages that magnesium is recycled by introducing ammonia gas, the pH value of the solution is easier to control, the method of directly adding alkali liquor is easy to realize that the detected pH value in the neutralization tank is low due to the fact that the solution is added too fast or too much in the neutralization tank, the alkali liquor is not in time to be fully mixed with the solution in the neutralization tank, the alkali liquor is continuously added, the alkali liquor is added too much, the pH value in the neutralization tank reaches the pH value at which calcium ions begin to precipitate, calcium hydroxide is doped in the recycled magnesium hydroxide, and the purity of the magnesium hydroxide is reduced. The ammonia gas is introduced without the problem of excessive investment, and the pH value in the neutralization tank can be better controlled, so that the purity of the magnesium hydroxide is improved.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure, 1-a desulfurizing tower, 2-a neutralizing tank, 3-a magnesium recovery tank, 4-a reaction tank, 5-a liquid ammonia bottle, 6-a magnesium recovery tank, 7-an alkali liquor inlet, 8-a sedimentation tank, 9-an ammonia storage device, 10-a pipeline, 11-an ammonia conveying fan and 12-a subsequent treatment tank.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic concept of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the form, amount and ratio of the components in actual implementation may be changed at will, and the layout of the components may be more complicated.
The first embodiment is as follows:
as shown in figure 1, a magnesium recovery unit of thermal power factory, the device includes desulfurizing tower 1, neutralization pond 2, magnesium recovery tank 3 and reaction vessel, desulfurizing tower 1 connects neutralization pond 2, neutralization pond 2 connects the inlet of magnesium recovery tank 3, magnesium recovery tank 3 is connected with liquid ammonia bottle 5 through pipeline 10, the bottom discharge gate of magnesium recovery tank 3 is connected with magnesium recovery pond 6, the reaction vessel is connected to the upper end liquid outlet of magnesium recovery tank 3, it goes into liquid mouth 7 to be equipped with alkali lye on the reaction vessel, sedimentation tank 8 is connected to reaction vessel's bottom discharge gate, the last liquid outlet that is equipped with of reaction vessel.
The wastewater in the desulfurization tower 1 flows into a neutralization tank 2, and calcium hydroxide [ Ca (OH) ] is charged into the neutralization tank 22]Adjusting the pH value of the wastewater to 8.0-9.0, and carrying out the following reaction:
W2++Ca(OH)2＝W(OH)2↓+Ca2+ (1)
Ca2++SO4 2-＝CaSO4↓ (2)
W2+represents heavy metal ions, the heavy metal ions and sulfate ions are separated from the wastewater in a precipitation form through the chemical reaction, the precipitate at the bottom of the neutralization tank 2 is discharged, and the supernatant of the neutralization tank 2 flows into a magnesium recovery tank 3.
After the supernatant in the neutralization tank 2 flows into a magnesium recovery tank 3, ammonia gas is introduced into the magnesium recovery tank 3 from a liquid ammonia bottle 5, the pH of the solution in the magnesium recovery tank 3 is adjusted to 10-11, and the solution is aged for about 60 minutes to react as follows:
Mg2++2NH3·H20＝Mg(OH)2↓+2NH4 + (3)
this is because the pH at which magnesium ions start to precipitate is 7.7 and the pH at which the final precipitate is 11.2; and calcium ion begins to sinkThe pH value of the precipitate is 11.3, the pH value of the final precipitate is 13.9, ammonia gas is introduced to adjust the pH value to 10-11, and magnesium ions are Mg (OH)2The precipitated form separates from the solution, while the calcium ions remain in solution.
Mg(OH)2The sediment enters a magnesium recovery tank 6 through a bottom discharge port, the solution in the magnesium recovery tank 3 flows into a reaction container through an upper end liquid outlet, alkali liquor is added through an alkali liquor inlet 7, the pH of the solution in the reaction container is adjusted to 12-13, and the following reaction occurs:
Ca2++2OH-＝Ca(OH)2↓ (4)
Mg2++2OH-＝Mg(OH)2↓ (5)
NH4 ++OH-＝NH3·H20 (6)
NH3·H20＝NH3↑+H20 (7)
calcium hydroxide and magnesium hydroxide precipitate enter the sedimentation tank 8 from a discharge hole at the bottom, and the residual solution after reaction flows out from a liquid outlet.
The calcium hydroxide and the magnesium hydroxide precipitate can be put into the neutralization tank 2 again for reuse, and the magnesium ions in the calcium hydroxide and the magnesium hydroxide precipitate are recycled by the magnesium recycling tank 3, so that the recovery rate of magnesium is improved.
The storehouse is thrown in the setting of 2 tops in neutralization pond, throws into the storehouse below and sets up the opening that can close, and 8 belows in the sedimentation tank set up the slide rail, and the slide rail leads to and throws into the storehouse top, sets up on the sedimentation tank 8 and emptys the device, makes sedimentation tank 8 empty, and calcium hydrate and magnesium hydrate in the sedimentation tank 8 deposit and get into through the opening that drops into the storehouse top and throw into the storehouse, when needing to drop into neutralization pond 2, the opening that drops into the storehouse below is opened.
Carry out the recovery of magnesium through the mode of letting in the ammonia, it is easy to control the pH of solution, and the mode of directly throwing into alkali lye, very easily because throw into too fast or solution too much in the neutralization pond 2, alkali lye is too late with the solution intensive mixing in the neutralization pond 2, and lead to detecting pH value in the neutralization pond 2 to be on the low side, and continue to throw into alkali lye, lead to throwing into alkali lye too much, pH value reaches the pH value that calcium ion begins to precipitate in the neutralization pond 2, lead to mixing with calcium hydroxide in the magnesium hydroxide of retrieving, the purity of magnesium hydroxide has been reduced. The ammonia gas is introduced without the problem of excessive investment.
Preferably, the reaction vessel is a reaction tank 4, an air outlet at the top of the reaction tank 4 is connected with an ammonia gas storage device 9 through a pipeline 10, the ammonia gas storage device 9 is connected with the magnesium recovery tank 3 through a pipeline 10, and valves are arranged on the pipelines 10.
The ammonia gas generated by the reaction in the reaction tank 4 is stored by the ammonia gas storage device 9 and then is used in the magnesium recovery tank 3, so that the ammonia gas can be saved, and the cost is reduced.
And a heating device is arranged on the reaction tank 4.
After calcium hydroxide and magnesium hydroxide in the reaction tank 4 are precipitated and enter the sedimentation tank 8, the reaction tank 4 is heated through heating equipment, so that the reaction in the formula (7) can be accelerated, more ammonia gas is collected, and meanwhile, the pH value of the solution in the reaction tank 4 is reduced, and the subsequent treatment is facilitated.
A pressure reducing valve is arranged between the liquid ammonia bottle 5 and the magnesium recovery tank 3. The liquid ammonia can be converted into ammonia gas through a pressure reducing valve.
Valves are arranged on the liquid inlet, the bottom end discharge hole and the upper end liquid outlet of the magnesium recovery tank 3; and valves are arranged on the alkali liquor inlet 7, the bottom discharge hole and the liquor outlet of the reaction tank 4.
The magnesium recovery tank 3 and the reaction tank 4 are controlled by the valve, so that the magnesium recovery tank 3 is isolated from the outside when ammonia is introduced, the reaction tank 4 is only communicated with the ammonia storage device 9 when ammonia is generated, and the reaction tank 4 and the ammonia storage device 9 are isolated from the outside.
And an ammonia gas conveying fan 11 is arranged on a pipeline 10 between the ammonia gas storage device 9 and the magnesium recovery tank 3, and the ammonia gas conveying fan 11 conveys the ammonia gas in the ammonia gas storage device 9 into the magnesium recovery tank 3.
And the neutralization tank 2, the magnesium recovery tank 3 and the reaction tank 4 are all provided with an online pH detector. The online pH detector is electrically connected with the same controller. The valve is an electromagnetic valve which is electrically connected with the controller.
The controller receives the data of the online pH detector and controls the on-off of each electromagnetic valve according to the data.
The liquid outlet is connected with the subsequent treatment tank 12. The subsequent treatment tank 12 treats the solution therein, and adjusts the pH value in the period to make the solution meet the national discharge standard.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (9)
1. The utility model provides a magnesium recovery unit of thermal power factory which characterized in that: the device includes desulfurizing tower, neutralization pond, magnesium recovery tank and reaction vessel, the desulfurizing tower is connected the neutralization pond, the inlet of magnesium recovery tank is connected to the neutralization pond, the magnesium recovery tank has liquid ammonia bottle through pipe connection, the bottom discharge gate of magnesium recovery tank is connected with the magnesium recovery pond, the reaction vessel is connected to the upper end liquid outlet of magnesium recovery tank, it goes into the liquid mouth to be equipped with alkali lye on the reaction vessel, the sedimentation tank is connected to reaction vessel's bottom discharge gate, the last liquid outlet that is equipped with of reaction vessel.
2. The magnesium recovery apparatus of a thermal power plant according to claim 1, wherein: the reaction vessel is a reaction tank, a gas outlet at the top of the reaction tank is connected with an ammonia gas storage device through a pipeline, the ammonia gas storage device is connected with a magnesium recovery tank through a pipeline, and valves are arranged on the pipelines.
3. The magnesium recovery apparatus of a thermal power plant according to claim 2, wherein: and a heating device is arranged on the reaction tank.
4. The magnesium recovery apparatus of a thermal power plant according to claim 2 or 3, wherein: and a pressure reducing valve is arranged between the liquid ammonia bottle and the magnesium recovery tank.
5. The magnesium recovery apparatus of a thermal power plant according to claim 2, wherein: valves are arranged on the liquid inlet, the bottom end discharge port and the upper end liquid outlet of the magnesium recovery tank; and valves are arranged on the alkali liquor inlet, the bottom discharge hole and the liquor outlet of the reaction tank.
6. The magnesium recovery apparatus of a thermal power plant according to claim 2 or 3, wherein: and an ammonia gas conveying fan is arranged on a pipeline between the ammonia gas storage device and the magnesium recovery tank and conveys ammonia gas in the ammonia gas storage device to the magnesium recovery tank.
7. The magnesium recovery apparatus of a thermal power plant according to claim 2, wherein: and the neutralization tank, the magnesium recovery tank and the reaction tank are all provided with online pH detectors.
8. The magnesium recovery apparatus of a thermal power plant according to claim 7, wherein: the online pH detector is electrically connected with the same controller.
9. The magnesium recovery apparatus of a thermal power plant according to claim 1, wherein: the liquid outlet is connected with the subsequent treatment pool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023211358.9U CN213895219U (en) | 2020-12-28 | 2020-12-28 | Magnesium recovery device of thermal power factory |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023211358.9U CN213895219U (en) | 2020-12-28 | 2020-12-28 | Magnesium recovery device of thermal power factory |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213895219U true CN213895219U (en) | 2021-08-06 |
Family
ID=77106427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023211358.9U Expired - Fee Related CN213895219U (en) | 2020-12-28 | 2020-12-28 | Magnesium recovery device of thermal power factory |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213895219U (en) |
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2020
- 2020-12-28 CN CN202023211358.9U patent/CN213895219U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210806 Termination date: 20211228 |