CN213506016U - Salt water refining device - Google Patents
Salt water refining device Download PDFInfo
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- CN213506016U CN213506016U CN202022103100.0U CN202022103100U CN213506016U CN 213506016 U CN213506016 U CN 213506016U CN 202022103100 U CN202022103100 U CN 202022103100U CN 213506016 U CN213506016 U CN 213506016U
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Abstract
A brine refining device comprises a salting-out groove, a first settling groove, a coarse filter, an inorganic membrane filter and a second settling groove, wherein the salting-out groove is used for mixing and dissolving dilute brine and magnesium chloride hexahydrate and salting out to obtain a mixed solution and salty mud; the first settling tank is communicated with the salting-out tank and is used for settling the mixed solution to obtain a sodium chloride solid and a first overflow liquid; the coarse filter is communicated with the first settling tank and is used for performing coarse filtration on the first overflow liquid to remove impurities to obtain filtrate; the inorganic membrane filter is communicated with the coarse filter and is used for carrying out membrane filtration on the filtrate to obtain refined magnesium chloride and concentrated solution; the second settling tank communicates with inorganic membrane filter and coarse filter respectively for subside the concentrate, obtain subsiding underflow and second overflow liquid, and emit into coarse filter with the second overflow liquid, will subside underflow recycle, the utility model discloses can carry out the edulcoration to magnesium chloride simultaneously and carry out the sodium chloride to light salt solution and retrieve, simple structure facilitates the use.
Description
Technical Field
The utility model relates to a chemical industry field, more specifically relates to a salt solution refining plant.
Background
Magnesium hydroxide is a new type of filling fire retardant, and through the release of bound water during thermal decomposition and the absorption of a large amount of heat, the surface temperature of the synthetic material filled with the magnesium hydroxide in the flame is reduced, the magnesium hydroxide has the functions of inhibiting the decomposition of polymer and cooling the generated combustible gas, the magnesium oxide generated by decomposition is a good refractory material, and the water vapor released by the magnesium hydroxide can also be used as a smoke suppressant. Magnesium hydroxide as a fire retardant filler has extremely high requirements on the product quality, the magnesium chloride solution used as a raw material for producing the magnesium hydroxide has high purity requirements, the magnesium chloride hexahydrate is used as the raw material for producing the magnesium hydroxide in a production workshop, the raw material contains more impurities due to unsealed sites for storing the raw material, and the magnesium chloride hexahydrate has strong water absorption, so the impurity content in the raw material is high, such as Ca2+、SO42-And solid impurities, and the like, and the magnesium chloride hexahydrate needs to be subjected to impurity removal before use.
A large amount of light salt brine is generated when a caustic soda workshop runs, the light salt brine contains a large amount of sodium chloride (the salt content is 220 +/-5 g/L), and if the light salt brine is not recycled, environmental pollution and resource waste are caused, so that the brine generated in the caustic soda workshop needs to be recycled. The existing device is used for independently removing impurities of magnesium chloride hexahydrate and independently recovering light brine, so that when the impurities of the magnesium chloride hexahydrate are removed and sodium chloride is recovered, a large amount of water resources are wasted, electric energy is consumed, a large amount of fields are occupied, a large amount of workers are increased, and huge economic burden is brought to a factory.
Therefore, in order to save water resources and reduce energy consumption, a brine refining device capable of simultaneously removing impurities from magnesium chloride hexahydrate and recovering sodium chloride brine is needed.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, the present invention provides a brine refining device, comprising a salting-out tank 1, a first settling tank 2, a coarse filter 3, an inorganic membrane filter 4 and a second settling tank 5, wherein the salting-out tank 1 is used for mixing and dissolving dilute brine and magnesium chloride hexahydrate, and salting-out is performed to obtain a mixed solution and salty mud; the first settling tank 2 is communicated with the salting-out tank 1 and is used for precipitating the mixed solution to obtain a sodium chloride solid and a first overflow liquid; the coarse filter 3 is communicated with the first settling tank 2 and is used for performing coarse filtration on the first overflow liquid to remove impurities to obtain a filtrate; the inorganic membrane filter 4 is communicated with the coarse filter 3 and is used for carrying out membrane filtration on the filtrate to obtain refined magnesium chloride and concentrated solution; the second settling tank 5 is respectively communicated with the inorganic membrane filter 4 and the coarse filter 3, and is used for settling the concentrated solution to obtain a settling underflow and a second overflow solution, discharging the second overflow solution into the coarse filter 3, and recycling the settling underflow.
According to the utility model discloses an embodiment still includes salt mud pond 6, salt mud pond 6 and the groove 1 intercommunication of salting out for hold the salt mud in the groove 1 of salting out.
According to the utility model discloses an embodiment still includes clear liquid jar 7, clear liquid jar 7 respectively with first subsider 2 with coarse filter 3 intercommunication for first overflow liquid of keeping in.
According to the utility model discloses an embodiment still includes centrifuge 8, centrifuge 8 respectively with first settling tank 2 with clear liquid jar 7 intercommunication, be used for the sodium chloride solid carries out solid-liquid separation, obtains sodium chloride filter cake and centrifugate to discharge clear liquid jar 7 with the centrifugate.
According to the utility model discloses an embodiment still includes plate and frame filter press 9, plate and frame filter press 9 respectively with second settling tank 5 with clear liquid jar 7 intercommunication for carry out the filter-pressing with the subside underflow in the second settling tank 5, obtain mixture filter cake and filtrating, and carry filtrating to clear liquid jar 7.
According to the utility model discloses an embodiment still includes backwash tank 10, backwash tank 10 with inorganic membrane filter 4 intercommunication for carry out the back flush to inorganic membrane filter 4.
According to the utility model discloses an embodiment still includes and washs jar 11, wash jar 11 with inorganic membrane filter 4 intercommunication, it is right to be used for inorganic membrane filter 4 washes.
According to the utility model discloses an embodiment still includes heat exchanger 12, heat exchanger 12 communicates with coarse filter 3 and inorganic membrane filter 4 respectively, is used for right the filtrate heats.
According to an embodiment of the present invention, the inorganic membrane filter 4 is provided with two, and the two inorganic membrane filters 4 are connected in parallel.
According to the utility model discloses an embodiment still includes sodium chloride filter cake collecting vat 13, sodium chloride filter cake collecting vat 13 and centrifuge 8 intercommunication are used for with the sodium chloride filter cake is collected and is washed.
The utility model discloses a setting up the groove of salting out and dissolving light salt solution and magnesium chloride hexahydrate, provide chloridion through the magnesium chloride and make the sodium chloride supersaturation and crystallization precipitation, can carry out the edulcoration and carry out recycle to sodium chloride in the light salt solution to magnesium chloride hexahydrate simultaneously, set up the salt mud pond and keep in the salt mud, can prevent that the pipeline mouth that the salt mud will salt out the inslot from blockking up, make the salt mud form solution and return to salting out the groove and continue to filter and retrieve; the clear liquid tank is arranged for temporarily storing the first overflow liquid, so that the reduction of the filtration efficiency or the damage of equipment caused by the unbalance of the solid-liquid ratio in the inorganic membrane filter can be prevented; a centrifugal machine is arranged to carry out solid-liquid separation on the sodium chloride crystals settled in the first settling tank and recover the sodium chloride; a plate-and-frame filter press is arranged to carry out solid-liquid separation on the sedimentation underflow in the second sedimentation tank, so that the magnesium chloride in the filtrate can be continuously recovered; the back flushing tank is arranged, so that the blocking matters in the membrane pores can be flushed away, and the filtering efficiency of the inorganic membrane filter is improved; the cleaning tank is arranged to flush the inorganic membrane filter, so that the filtering capacity of the inorganic membrane filter can be quickly recovered; the two inorganic membrane filters are arranged, one is used for the other, the production line can be prevented from being integrally stopped when the inorganic membrane filter is cleaned or breaks down, and the device is simple in structure, easy to install and convenient to control.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a brine purification plant;
FIG. 2 is a schematic diagram of the general structure of the brine refining device with a clear liquid tank.
In the figure, 1, a salting-out groove, 2, a first settling groove, 3, a coarse filter, 4, an inorganic membrane filter, 5, a second settling groove, 6, a salt mud pool, 7, a clear liquid tank, 8, a centrifuge, 9, a plate-and-frame filter press, 10, a back flushing tank, 11, a cleaning tank, 12, a heat exchanger and 13, a sodium chloride filter cake collecting tank.
Detailed Description
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like elements and techniques of the present invention so that advantages and features of the present invention may be more readily understood when implemented in a suitable environment. The following description is an embodiment of the present invention, and other embodiments related to the claims that are not explicitly described also fall within the scope of the claims.
Fig. 1 shows a schematic view of the general structure of a brine purification plant.
As shown in FIG. 1, a brine purification apparatus comprises a salting-out tank 1, a first settling tank 2, a coarse filter 3, an inorganic membrane filter 4 and a second settling tank 5, wherein the salting-out tank 1 is used for mixing and dissolving dilute brine and magnesium chloride hexahydrate and salting out to obtain a mixed solution and salty mud; the first settling tank 2 is communicated with the salting-out tank 1 and is used for precipitating the mixed solution to obtain a sodium chloride solid and a first overflow liquid; the coarse filter 3 is communicated with the first settling tank 2 and is used for performing coarse filtration on the first overflow liquid to remove impurities to obtain a filtrate; the inorganic membrane filter 4 is communicated with the coarse filter 3 and is used for carrying out membrane filtration on the filtrate to obtain refined magnesium chloride and concentrated solution; the second settling tank 5 is respectively communicated with the inorganic membrane filter 4 and the coarse filter 3, and is used for settling the concentrated solution to obtain a settling underflow and a second overflow solution, discharging the second overflow solution into the coarse filter 3, and recycling the settling underflow.
The salting-out groove 1 is used for mixing and dissolving light salt water and magnesium chloride hexahydrate, a stirrer is arranged in the salting-out groove 1, the dissolving can be accelerated, after the magnesium chloride hexahydrate is completely dissolved, chloride ions in the solution enable sodium chloride solution to enter a supersaturated state and crystallize and separate out, sodium chloride crystals can be separated out in the salting-out groove 1, the concentration of solid-phase substances is about 7-14%, part of sodium chloride crystals and part of impurities are precipitated in the salting-out groove 1 to form salt mud, and the mixed solution is conveyed into the first settling tank 2 through a salting-out pump to enable the sodium chloride crystals to be settled.
The settling tank is used for settling sodium chloride crystals in the mixed solution to form sodium chloride solids, so that the concentration of solid phase substances in the settling tank reaches more than 40%, the first overflow liquid on the upper part of the settling tank flows out through the overflow hole on the upper part of the settling tank and enters the coarse filter 3 for coarse filtration, the solid phase substances on the bottom of the settling tank are conveyed to the centrifuge 8 for solid-liquid separation, and the sodium chloride solids are recovered.
The coarse filter 3 is used for filtering impurities larger than 1mm in the solution, the filtered liquid after coarse filtration enters the inorganic membrane filter 4 to continue membrane filtration, the coarse filter 3 is arranged to reduce the blockage of the impurities in the solution to the inorganic membrane filter 4, and the filtration efficiency of the inorganic membrane filter 4 is improved.
The inorganic membrane filter 4 adopts a ceramic membrane tube as a filter element, and filters and removes the residual impurities in the magnesium chloride salt water after coarse filtration in a cross-flow filtration mode, so as to ensure that the impurity content in the magnesium chloride salt water reaches the process requirement of less than 10 PPm.
The inorganic membrane filters 4 can be arranged in a plurality, the inorganic membrane filters 4 are arranged in parallel, when one of the inorganic membrane filters 4 is cleaned or breaks down, the other inorganic membrane filter 4 is started to filter, and the whole production line is prevented from stopping when the inorganic membrane filter 4 is cleaned or breaks down.
The secondary settling tank is used for settling the concentrated solution filtered by the inorganic membrane filter 4 to obtain a settling underflow and a secondary overflow solution, the settling underflow mainly contains sodium chloride, impurities in magnesium chloride hexahydrate and the like, the secondary overflow solution contains part of magnesium chloride, the secondary overflow solution returns to the coarse filter 3 to continue to be filtered and circulated, and the settling underflow at the bottom of the secondary settling tank is subjected to other treatment.
When the device is used, the dilute brine and the magnesium chloride hexahydrate are added into a salting-out tank 1 according to a certain proportion, the magnesium chloride hexahydrate is completely dissolved under the stirring action of a stirrer in the salting-out tank 1, the dissolved mixed solution enters a first settling tank 2, sodium chloride crystals separated out through crystallization continuously settle to the bottom of the settling tank, the first settling solution on the upper portion of the settling tank flows into a coarse filter 3 through an overflow hole in the upper portion of the settling tank for coarse filtration, the coarse filter 3 filters impurities with larger particles in the first settling solution, the filtered filtrate enters an inorganic membrane filter 4 for cross-flow filtration, the filtered refined magnesium chloride solution enters the next workshop for use, the remaining concentrated solution enters a second settling tank 5 for settling, the settled mixture solids are transported outwards, and the secondary settling solution on the upper portion of the settling tank returns to the coarse filter 3 for continuous filtration.
Relevant parameters can be set in the PLC control system, so that the PLC control system is electrically connected with valves, switches and the like of each device, and automatic control of the device is realized.
The utility model discloses a setting up the groove of salting out and dissolving weak brine and hexahydrate magnesium chloride, providing the chloride ion through the magnesium chloride and making sodium chloride supersaturation and crystallization in the solution appear, set up first settling tank and second settling tank and carry out crystallization recovery with sodium chloride, set up coarse filter and inorganic membrane filter and can filter the purification with the impurity in the magnesium chloride, the utility model discloses can carry out the edulcoration and carry out recycle to sodium chloride in the weak brine to the magnesium chloride hexahydrate simultaneously, can practice thrift a large amount of water resources, prevent that weak brine from directly discharging polluted environment, can also energy saving, reduce the enterprise investment, the device simple structure, convenient operation.
Fig. 2 shows a general structure schematic diagram of the brine refining device with a clear liquid tank.
As shown in fig. 2, the salt mud tank 6 is further included, and the salt mud tank 6 is communicated with the salting-out groove 1 and is used for containing the salt mud in the salting-out groove 1.
Because magnesium chloride hexahydrate contains more impurities, larger particle impurities can be precipitated in the salting-out groove 1, sodium chloride crystals are precipitated in the salting-out groove 1, part of impurities and part of sodium chloride crystals can be precipitated into salty mud at the bottom of the salting-out groove 1, and if the impurities and part of sodium chloride crystals are not treated in time, a pipeline which is positioned at the bottom of the salting-out groove 1 and used for communicating a first sedimentation tank can be blocked.
The salt mud pool 6 is used for temporarily storing salt mud in the salting-out groove 1, and drain valves are arranged at the bottom of the salting-out groove 1 and on pipelines of the salting-out pool, so that the salt mud in the salting-out groove 1 can be discharged into the salt mud pool 6 at regular time. The salt mud pool 6 is provided with an aeration device for completely forming salt mud in the salt mud pool 6 into solution, and then the salt mud is conveyed back into the salting-out groove 1 by a salt mud pump for continuous circulation and filtration recovery. Set up salt mud pond 6 and can keep in the salt mud of 1 bottoms in the groove of salting out, prevent to salt mud blockage pipeline export 1 bottoms in the groove of salting out to salt mud forms solution and continues to filter and retrieve the sodium chloride in the salt mud with salt mud pond 6.
The utility model discloses set up the salt mud pond, through the salt mud of salt mud pond storage salting out tank bottom to form the whole solution that forms of salt mud and return to salting out the inslot and continue to filter, can prevent to salt the pipe blockage of the inslot salt mud of salting out groove intercommunication first subsider, can also make the salt mud form the solution in the salt mud pond and return to salting out the groove and continue to filter and retrieve.
As shown in fig. 2, the system further comprises a clear liquid tank 7, and the clear liquid tank 7 is respectively communicated with the first settling tank 2 and the coarse filter 3 and is used for temporarily storing the first overflow liquid.
The clear solution tank 7 is used for storing a first settling solution in the first settling tank 2, a second settling solution in the second settling tank 5, a centrifugal solution obtained after solid-liquid separation of the centrifugal machine 8 and a filtrate obtained after filter pressing of the plate-and-frame filter press 9 on the mixture solid, and the solution stored in the clear solution tank 7 is fed and replenished according to the solid-liquid content proportion in the circulating system of the inorganic membrane filter 4, so that the solid-liquid content proportion in the circulating system is kept stable, and the reduction of the filtering efficiency of the inorganic membrane filter 4 or the damage of equipment are prevented.
Because the inorganic membrane filter 4 is in a cross flow filtration mode, namely, the solution is made to do high-speed circulation motion in the pore channel in the inorganic membrane filter 4 by the circulating pump, the magnesium chloride solution forms a pure refined magnesium chloride solution after passing through the inorganic membrane, sodium chloride, impurity particles and the like are blocked at one side of the circulating liquid, in order to keep the solid content of the solution in the circulating system below a certain concentration, part of concentrated liquid in the circulating system is discharged into the second settling tank 5 for settling, and meanwhile, the solution in the clear liquid tank 7 is continuously supplemented into the circulating system by the liquid supplementing pump, so that the balance of the solid-liquid content ratio in the circulating system is kept.
The utility model discloses set up the clear solution jar to deposit first overflow liquid through the clear solution jar, carry out the feed fluid infusion according to solid-liquid content in the inorganic membrane filter circulation system, make the solid-liquid content of solution remain stable in the inorganic membrane filter circulation system, prevent that the imbalance of solid-liquid content ratio because of solution in the inorganic membrane filter leads to filtration efficiency to reduce or equipment to damage.
As shown in fig. 2, the device further comprises a centrifuge 8, wherein the centrifuge 8 is respectively communicated with the first settling tank 2 and the clear liquid tank 7, and is used for performing solid-liquid separation on the sodium chloride solid to obtain a sodium chloride filter cake and a centrifugate, and discharging the centrifugate into the clear liquid tank 7.
And a centrifugal machine is arranged to carry out solid-liquid separation on the sodium chloride solid settled in the first settling tank to form a sodium chloride filter cake and a centrifugate, the obtained sodium chloride filter cake is recycled, and the centrifugate is discharged into a clear liquid tank to be continuously filtered.
As shown in fig. 2, the system further comprises a plate-and-frame filter press 9, wherein the plate-and-frame filter press 9 is respectively communicated with the second settling tank 5 and the clear liquid tank 7, and is used for performing filter pressing on the precipitate in the second settling tank 5 to obtain a mixture filter cake and a filtrate, and conveying the filtrate to the clear liquid tank 7.
The sedimentation underflow contains a large amount of sodium chloride crystals, partial impurities and the like, a plate-and-frame filter press 9 is arranged, the sedimentation underflow in the second sedimentation tank 5 is subjected to filter pressing through the plate-and-frame filter press 9, solid-liquid separation can be performed on the sedimentation underflow in the second sedimentation tank 5, a mixture filter cake and filtrate are obtained, the mixture filter cake is conveyed to other workshops for treatment and use, the filtrate is conveyed to a clear liquid tank 7 for continuous filtration, the mixture filter cake can be recovered, and magnesium chloride in the filtrate can be continuously recovered.
And arranging a plate-and-frame filter press, carrying out filter pressing on the sedimentation underflow in the second sedimentation tank through the plate-and-frame filter press, carrying out solid-liquid separation on the sedimentation underflow in the second sedimentation tank, recovering a mixture filter cake, and continuously recovering magnesium chloride in the filtrate.
As shown in fig. 2, the membrane filter further comprises a back-washing tank 10, wherein the back-washing tank 10 is communicated with the inorganic membrane filter 4 and is used for back-washing the inorganic membrane filter 4.
After the inorganic membrane filter 4 is filtered for a long time, a plug exists in a membrane hole, the inorganic membrane filter 4 needs to be backwashed regularly, when the inorganic membrane filter is backwashed, a backflushing valve at a membrane component is opened, the backflushing liquid in a backflushing tank is pressed into a backflushing pipeline and finally enters a clear liquid cavity of the membrane component under the action of compressed air, the backflushing liquid rapidly and reversely passes through a filter membrane and takes away the plug in the membrane hole, the backflushing cleaning of the membrane component is realized, and the liquid after the backflushing cleaning enters a second settling tank 5 for settling.
The utility model discloses set up the recoil jar, carry out the backwash through the recoil jar to inorganic membrane filter, can take away the downthehole plug of membrane, improve inorganic membrane filter's filtration efficiency.
As shown in fig. 2, the device further comprises a cleaning tank 11, wherein the cleaning tank 11 is communicated with the inorganic membrane filter 4 and is used for cleaning the inorganic membrane filter 4.
After the inorganic membrane filter 4 operates for a period of time, the filtration pressure of the membrane element is increased and the filtration flux is reduced due to membrane pollution, the filtration capacity of the membrane element is recovered by cleaning the whole filtration system, and the system cleaning needs primary water washing, primary acid washing and secondary water washing.
When the filter is used, firstly, washing is carried out for one time, namely, the filter is washed by the light salt water for 5-10 minutes, and the salt mud in the system is discharged as far as possible; then acid cleaning is carried out, firstly desalted water is supplemented into the cleaning tank 11, the concentration of the added hydrochloric acid is controlled to be about 15%, then an inorganic membrane filtration system needing cleaning is disconnected, cleaning acid liquid enters the inorganic membrane filter 4, a membrane filtration circulating pump is started for acid cleaning, and the acid cleaning time is not less than 1 hour; and finally, carrying out secondary washing, namely washing the system by using light saline, and finishing the secondary washing when the pH value in the system is consistent with that in normal production.
The cleaning tank is arranged, and the inorganic membrane filter is washed by the cleaning tank, so that the filtering capacity of the inorganic membrane filter can be quickly recovered.
As shown in fig. 2, the system further comprises a heat exchanger 12, wherein the heat exchanger 12 is respectively communicated with the coarse filter 3 and the inorganic membrane filter 4 and is used for heating the filtrate.
The heat exchanger 12 is used for heating the filtered liquid after coarse filtration, so that the temperature of the coarse filtered liquid is kept at 45 +/-5 ℃ before the coarse filtered liquid enters the inorganic membrane filter, the heat exchanger 12 is heated by steam, the heating speed is high, the effect is good, the temperature is controllable, and the inorganic membrane filter 4 can be in the optimal filtering state.
The heat exchanger is arranged to heat the crude filtrate, so that the inorganic membrane filter can be in the optimal filtering state.
As shown in fig. 2, two inorganic membrane filters 4 are provided, and two inorganic membrane filters 4 are provided in parallel.
The two inorganic membrane filters 4 are arranged in parallel, one inorganic membrane filter 4 is used for standby, when one inorganic membrane filter 4 is cleaned or breaks down, the other inorganic membrane filter 4 is started to filter, and the whole production line is prevented from stopping when the inorganic membrane filter 4 is cleaned or breaks down.
Two inorganic membrane filters are arranged, one is used for the next, and the whole stop of the production line can be prevented when the inorganic membrane filter is cleaned or fails.
As shown in fig. 2, a sodium chloride cake holding tank 13 is also included, the sodium chloride cake holding tank 13 being in communication with the centrifuge 8 for collecting and flushing the sodium chloride cake.
And a sodium chloride filter cake collecting tank is arranged, so that a sodium chloride filter cake can be collected and washed to obtain a clean sodium chloride filter cake.
The utility model discloses a setting up the groove of salting out and dissolving light salt solution and magnesium chloride hexahydrate, provide chloridion through the magnesium chloride and make the sodium chloride supersaturation and crystallization precipitation, can carry out the edulcoration and carry out recycle to sodium chloride in the light salt solution to magnesium chloride hexahydrate simultaneously, set up the salt mud pond and keep in the salt mud, can prevent that the pipeline mouth that the salt mud will salt out the inslot from blockking up, make the salt mud form solution and return to salting out the groove and continue to filter and retrieve; the clear liquid tank is arranged for temporarily storing the first overflow liquid, so that the reduction of the filtration efficiency or the damage of equipment caused by the unbalance of the solid-liquid ratio in the inorganic membrane filter can be prevented; a centrifugal machine is arranged to carry out solid-liquid separation on the sodium chloride crystals settled in the first settling tank and recover the sodium chloride; a plate-and-frame filter press is arranged to carry out solid-liquid separation on the sedimentation underflow in the second sedimentation tank, so that the magnesium chloride in the filtrate can be continuously recovered; the back flushing tank is arranged, so that the blocking matters in the membrane pores can be flushed away, and the filtering efficiency of the inorganic membrane filter is improved; the cleaning tank is arranged to flush the inorganic membrane filter, so that the filtering capacity of the inorganic membrane filter can be quickly recovered; the two inorganic membrane filters are arranged, one is used for the other, the production line can be prevented from being integrally stopped when the inorganic membrane filter is cleaned or breaks down, and the device is simple in structure, easy to install and convenient to control.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.
Claims (10)
1. A brine refining device is characterized by comprising a salting-out groove (1), a first settling groove (2), a coarse filter (3), an inorganic membrane filter (4) and a second settling groove (5),
the salting-out groove (1) is used for mixing and dissolving light salt water and magnesium chloride hexahydrate and salting out to obtain a mixed solution and salt mud;
the first settling tank (2) is communicated with the salting-out tank (1) and is used for settling the mixed solution to obtain a sodium chloride solid and a first overflow liquid;
the coarse filter (3) is communicated with the first settling tank (2) and is used for performing coarse filtration on the first overflow liquid to remove impurities to obtain a filtrate;
the inorganic membrane filter (4) is communicated with the coarse filter (3) and is used for carrying out membrane filtration on the filtrate to obtain refined magnesium chloride and concentrated solution;
the second settling tank (5) is respectively communicated with the inorganic membrane filter (4) and the coarse filter (3) and is used for settling the concentrated solution to obtain a settling underflow and a second overflow solution, the second overflow solution is discharged into the coarse filter (3), and the settling underflow is recycled.
2. The brine refining apparatus according to claim 1, further comprising a salt mud basin (6),
the salt mud pool (6) is communicated with the salting-out groove (1) and is used for containing salt mud in the salting-out groove (1).
3. Saline refining device according to claim 1, characterized by further comprising a clear liquid tank (7),
the clear liquid tank (7) is respectively communicated with the first settling tank (2) and the coarse filter (3) and is used for temporarily storing a first overflow liquid.
4. Saline refining device according to claim 3, characterized by further comprising a centrifuge (8),
the centrifugal machine (8) is respectively communicated with the first settling tank (2) and the clear liquid tank (7) and is used for carrying out solid-liquid separation on the sodium chloride solid to obtain a sodium chloride filter cake and a centrifugal liquid, and discharging the centrifugal liquid into the clear liquid tank (7).
5. The brine purification apparatus according to claim 3, further comprising a plate and frame filter press (9),
and the plate-and-frame filter press (9) is respectively communicated with the second settling tank (5) and the clear liquid tank (7) and is used for carrying out filter pressing on the settling underflow in the second settling tank (5) to obtain a mixture filter cake and filtrate and conveying the filtrate to the clear liquid tank (7).
6. The brine refining apparatus according to claim 1, further comprising a backwash tank (10),
the backwashing tank (10) is communicated with the inorganic membrane filter (4) and is used for backwashing the inorganic membrane filter (4).
7. Saline refining device according to claim 1, characterized by further comprising a washing tank (11),
the cleaning tank (11) is communicated with the inorganic membrane filter (4) and is used for washing the inorganic membrane filter (4).
8. The brine refining apparatus according to claim 1, further comprising a heat exchanger (12),
the heat exchanger (12) is respectively communicated with the coarse filter (3) and the inorganic membrane filter (4) and is used for heating the filtrate.
9. Saline refining device according to claim 1, characterized in that said inorganic membrane filter (4) is provided in two,
the two inorganic membrane filters (4) are arranged in parallel.
10. The brine refining apparatus according to claim 1, further comprising a sodium chloride cake holding tank (13),
the sodium chloride filter cake collecting tank (13) is communicated with a centrifuge (8) and is used for collecting and flushing the sodium chloride filter cake.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022103100.0U CN213506016U (en) | 2020-09-23 | 2020-09-23 | Salt water refining device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022103100.0U CN213506016U (en) | 2020-09-23 | 2020-09-23 | Salt water refining device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213506016U true CN213506016U (en) | 2021-06-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022103100.0U Active CN213506016U (en) | 2020-09-23 | 2020-09-23 | Salt water refining device |
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| CN (1) | CN213506016U (en) |
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