CN211035260U

CN211035260U - Mirabilite melting equipment with function of separating mirabilite decahydrate crystal slurry

Info

Publication number: CN211035260U
Application number: CN201922157790.5U
Authority: CN
Inventors: 吕子红
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-28
Filing date: 2019-12-05
Publication date: 2020-07-17
Anticipated expiration: 2029-12-05

Abstract

The utility model provides a melt nitre equipment with separation sodium sulfate decahydrate magma function, including thickener and melt nitre ware, thickener includes that the bottom is conical barrel, and the barrel inner chamber constitutes magma storage area, is equipped with glauber's slurry inlet on the barrel, and the clear liquid is from overflow mouth and glauber's slurry export, melts between nitre ware and the thickener and keeps apart through the backup pad in glauber's slurry exit and the sub-assembly that wire mesh constitutes, melts the nitre ware and includes melting zone, melt mixer and melt nitre liquid pipeline, melts the nitre liquid and gets into melting the sodium sulfate decahydrate magma in the melting zone all the way; the other path enters a saltpeter melting device to be mixed and melted with saltpeter slurry from a melting zone. The utility model creatively melts the mirabilite crystal slurry obtained by denitration and freeze separation by membrane method directly to prepare high-nitre solution, thereby saving all links such as mirabilite crystal slurry centrifugal separation, solid mirabilite collection, transportation, lifting and feeding and the like; the difficulty of nitrate melting is reduced, the salting-out process is easier to control, and the aim of directly producing anhydrous sodium sulphate by membrane denitration is really realized.

Description

Mirabilite melting equipment with function of separating mirabilite decahydrate crystal slurry

Technical Field

The utility model belongs to the technical field of the inorganic salt separation, concretely relates to during ionic membrane caustic soda production, the glauber's salt crystal thick liquid of decahydrate that the brine membrance method denitration refrigeration was separated out, the equipment of glauber's salt crystal melting.

Background

SO in desorption system in chlor-alkali production₄ ^2-The denitration is generally carried out by adopting a light salt brine membrane method, and the concentrated solution obtained after the denitration by the light salt brine membrane method contains NaCl to 200 g/L and Na₂SO₄60-80 g/L, and the frozen and denitrated light salt water contains NaCl-200 g/L and Na₂SO₄5 g/L, most of Na₂SO₄The sodium sulfate decahydrate is settled in the form of sodium sulfate decahydrate crystals, the denitrified light brine clear solution is purified and recycled by brine, the sodium sulfate decahydrate crystal slurry is centrifugally separated to obtain solid sodium sulfate decahydrate, and the solid sodium sulfate decahydrate is used for processing anhydrous sodium sulfate or other production processes capable of replacing the application of anhydrous sodium sulfate.

Generally, the dehydration mode of the mirabilite decahydrate basically takes solid mirabilite after centrifugation as a raw material, the melting method of the solid mirabilite decahydrate is basically a kettle type melting method, and the mirabilite is dehydrated by adopting a corresponding dehydration device to produce anhydrous sodium sulphate, and the salt precipitation method, the evaporation concentration method, the circulating melting method and the like are adopted. The anhydrous sodium sulphate is prepared by dehydrating the solid mirabilite decahydrate, so that a plurality of links of collecting, packaging and transporting the solid mirabilite are increased, the risk of pollution by other substances is caused, and other mechanical impurities can be mixed into the solid mirabilite. The wet and fresh solid mirabilite has no fluidity and is easy to be mutually bonded with the packing material, and the wet and fresh solid mirabilite can be caked after being placed for a long time, so that the transport and the use are difficult.

In the method for preparing anhydrous sodium sulphate by dehydrating mirabilite decahydrate in chlor-alkali production and related mirabilite melting equipment (patent number: Z L201611171840. X), dehydration of the mirabilite decahydrate is completed in a salting-out unit, and the existence of sodium chloride has no strict requirement on whether the light salt water and the content of the light salt water exist in the solid mirabilite decahydrate, and the salting-out process is not influenced.

Disclosure of Invention

The technical task of the utility model is to solve the not enough of prior art, provide one kind and be suitable for industrial production, operation link to simplify, have the saltpeter melting equipment of separation glauber's salt magma function.

The design idea of the utility model is as follows:

analysis Z L201611171840. X shows that the saltpeter melting process is the key for realizing controllable regulation of the melting amount of the sodium sulfate decahydrate, so that the controllability of the saltpeter melting process is the key step for realizing large-scale industrial production.

Through the research of the prior art, the mirabilite crystal slurry from the freezing denitrification settler generally contains about 80 percent of water and about 20 percent of crystal slurry before centrifugal separation, is slurry fluid, has better fluidity compared with solid thenardite, can freely reach a saltpeter melting interface in saltpeter melting equipment in a saltpeter dewatering process by a salting-out method, can quickly update the decahydrate slurry when contacting with saltpeter liquid to melt saltpeter crystals, is easier to control the saltpeter melting, and can solve the defect that the solid thenardite has no fluidity when the decahydrate crystal slurry is used for melting the saltpeter. However, the slurry containing about-20% of the crystal is a general solid-containing fluid and does not have the characteristic of partial solid. Therefore, the applicant considers that the slurry containing 20 percent of solids is thickened to about 80 percent, the slurry can be piled up and formed, the thickened slurry has the characteristic of partial solid state, but has certain fluidity, and the compactness of the slurry can completely isolate liquid permeation and can be retained by a proper screen.

The utility model provides a technical scheme that its technical problem adopted is:

a saltpeter melting equipment with a function of separating mirabilite decahydrate crystal slurry comprises:

the thickener comprises a barrel with a conical bottom, a crystal slurry storage area is formed in the inner cavity of the barrel, a mirabilite slurry feeding port is formed in the top of the barrel, mirabilite slurry from a membrane-method denitration freezing unit is injected into the barrel through the mirabilite slurry feeding port, a clear liquid self-overflow port is formed in the upper part of the barrel, and a mirabilite slurry outlet is formed in the bottom of the barrel;

the saltpeter melting device comprises a melting area, a melt mixer and a saltpeter melting liquid pipeline, wherein the melting area is positioned below a saltpeter slurry outlet at the bottom of the thickener, an assembly part consisting of a supporting plate and a wire mesh is arranged at the saltpeter slurry outlet, an upper crystal slurry storage area is separated from a lower melting area by the assembly part, the melt mixer is communicated with the lower part of the melting area through a saltpeter slurry flowing pipeline, and the saltpeter melting liquid pipeline is divided into two paths:

one path of the molten sodium sulfate enters a melting zone and contacts with the sodium sulfate crystal slurry collected in the crystal slurry storage zone from bottom to top, the melting occurs at the solid-liquid contact surface, and the molten sodium sulfate slurry enters the melting zone from the gap of an assembly consisting of a supporting plate and a wire mesh; the other path enters a mixer to be mixed and melted with the nitrate slurry settled from the melting area, and a solid high nitrate solution is formed in the mixer to enter the next working procedure.

Preferably, the strength and the mesh number of the wire mesh in the assembly are based on the fact that the solid mirabilite crystal can be prevented from permeating through the gap, and the saltpeter slurry with reduced crystal compactness can pass through the partially melted mirabilite crystal.

Preferably, the support plate in the assembly covers the whole mirabilite slurry outlet, the position of the support plate corresponding to the mirabilite melting liquid pipeline is provided with an opening, and a wire mesh is arranged at the opening to retain the solid mirabilite crystal.

Preferably, the end of one path of molten nitrate liquid pipeline entering the melting area is connected with a spray head, and the spray head is positioned below the assembly and at a position where the fluid spraying position of the spray head is opposite to the position where the metal wire mesh is installed.

The solution is preferably characterized in that a rotating scraper is arranged in the thickener cylinder.

The scheme is preferred, rotatory scraper blade includes side scraper blade and end scraper blade, and the end scraper blade sets up in the barrel bottom, and end scraper blade sets up with the barrel is coaxial, and the side scraper blade sets up in the barrel lateral wall, is equipped with the scraper rake teeth on the rotatory scraper blade.

Preferably, the upper part of the thickener cylinder is provided with an upper group of mirabilite crystal slurry observation ports and a lower group of mirabilite crystal slurry observation ports for controlling the height of slurry.

Preferably, the upper and lower two sets of mirabilite crystal slurry observation ports are provided with four transparent glass sight glasses, and each set of mirabilite crystal slurry observation port is divided into two transparent glass sight glasses.

Preferably, the molten nitrate in the molten nitrate pipeline is a nitrate co-saturated solution.

Preferably, a temperature difference controller is connected between the melting zone and the melting mixer, and a flow regulator for realizing two-way flow diversion of the molten nitrate liquid pipeline is connected beside the molten nitrate liquid pipeline.

The utility model discloses a melt nitre equipment with separation sodium sulfate decahydrate magma function compares produced beneficial effect with prior art and is:

1. the utility model creatively melts the mirabilite crystal slurry obtained by denitration and freeze separation by membrane method directly to prepare high-nitre solution, thereby saving all links such as mirabilite crystal slurry centrifugal separation, solid mirabilite collection, transportation, lifting, feeding and the like; the difficulty of nitrate melting is reduced, the salting-out process is easier to control, and the aim of directly producing anhydrous sodium sulphate by membrane denitration is really realized;

2. the process for preparing anhydrous sodium sulphate by membrane denitration is simplified, the centrifugal separation of mirabilite crystal slurry into solid sodium sulfate decahydrate is omitted, and all links of centrifugal separation, collection, transportation, lifting and feeding and the like of the solid sodium sulfate are solved by one crystal slurry pump;

3. the mirabilite crystal slurry has fluidity, and can reach a melting interface at any time, so that the difficulty in melting the mirabilite of the solid mirabilite is reduced.

4. Saves one centrifuge, and has low power consumption.

5. When the mirabilite crystal is melted, the precipitation rate of anhydrous sodium sulfate is low, the sodium sulfate dissolved in the light brine is concentrated and precipitated during the salting-out reaction, and the product particles are easier to control.

Drawings

FIG. 1 is a schematic structural diagram of a mirabilite melting device with a function of separating mirabilite decahydrate crystal slurry according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of an assembly according to an embodiment;

fig. 3 is a schematic structural diagram of a mirabilite melting device with a function of separating mirabilite decahydrate crystal slurry according to the second embodiment of the present invention;

fig. 4 is an enlarged schematic view of a portion a in fig. 1 and 3.

The reference numerals in the figures denote:

1. a thickener, 100, a magma storage area, 101, a rotary scraper,

102. a mirabilite slurry feeding port, 103, a clear liquid overflow port, 104, a mirabilite slurry outlet,

2. a viewing port for mirabilite crystal slurry,

3. assembly 300, support plate 301, wire mesh.

4. A melting zone, 5, a spray head, 6, a melt mixer, 7, a saltpeter slurry flowing pipeline, 8, a saltpeter melting liquid pipeline,

9. scraping rake teeth.

Detailed Description

The nitrate melting equipment with the function of separating the mirabilite decahydrate crystal slurry of the present invention is described in detail below with reference to the attached drawings 1-2.

Example one

As shown in fig. 1, 2 and 4, the utility model discloses a melt nitre equipment with separate glauber's salt magma function, include:

the device comprises a thickener 1, wherein the thickener 1 comprises a barrel with a conical bottom, a crystal slurry storage area 100 is formed in an inner cavity of the barrel, a mirabilite slurry feeding port 102 is formed in the top of the barrel, mirabilite slurry from a membrane denitration freezing unit is injected into the barrel through the mirabilite slurry feeding port 102, a clear liquid overflow port 103 is formed in the upper part of the barrel, a mirabilite slurry outlet 104 is formed in the bottom of the barrel, a rotary scraper 101 is arranged in the barrel of the thickener 1, the rotary scraper 101 comprises a side scraper and a bottom scraper, the bottom scraper is arranged at the bottom of the barrel and is coaxial with the barrel, the side scraper is arranged on the side wall of the barrel, scraping rake teeth 9 are arranged on the rotary scraper 101, and the rotary scraper;

the saltpeter melting device comprises a melting zone 4, a mixing melting device 6 and a saltpeter melting liquid pipeline 8, wherein the melting zone 4 is positioned below a saltpeter slurry outlet 104 at the bottom of the thickener 1, an assembly 3 consisting of a support plate 300 and a wire mesh 301 is arranged at the saltpeter slurry outlet 104, the assembly 3 separates an upper crystal slurry storage zone 100 from a lower melting zone 4, the mixing melting device 6 is communicated with the lower part of the melting zone 4 through a saltpeter slurry flow pipeline 7, and the saltpeter melting liquid pipeline 8 is divided into two paths:

one path of the molten salt enters the melting zone 4 and contacts with the mirabilite magma gathered in the magma storage zone 100 from bottom to top, the solid-liquid contact surface is melted, and the molten mirabilite magma penetrates into the melting zone 4 from the gap of an assembly 3 consisting of a support plate 300 and a wire mesh 301; the other path enters a mixer 6 to be mixed and melted with the nitrate slurry settled from the melting zone 4, and a solution containing solid high nitrate is formed in the mixer 6 to enter the next working procedure.

The support plate 300 in the assembly 3 covers the whole mirabilite slurry outlet 104, the position of the support plate 300 corresponding to the mirabilite melting liquid pipeline 8 is opened, and a wire mesh 301 is arranged at the opening. The number of openings is not limited to the one illustrated in fig. 1, and a plurality of openings may be provided according to the amount of the anhydrous sodium sulfate to be produced. The strength and mesh of the metal wire mesh 301 in the assembly 3 are determined by the capability of preventing the solid mirabilite crystal from dripping from the gap, and the saltpeter slurry after melting the mirabilite crystal can pass through. Therefore, not only are a plurality of difficulties in melting the solid mirabilite solved, but also a centrifugal machine is saved, and the aim of directly producing the anhydrous sodium sulphate by membrane denitration is fulfilled.

The liquid in the nitrate melting liquid pipeline 8 is nitrate salt co-saturated solution.

One path of molten nitrate liquid pipeline 8 entering the melting area 4 is connected with a spray head 5, and the spray head 5 is positioned below the assembly 3 and opposite to the position where the wire mesh 301 is installed. The position of the supporting plate 300 corresponding to the fluid jet position of the spray head 5 on the molten mirabilite pipeline is opened, and a wire mesh 301 is arranged at the opening position to retain the solid mirabilite crystals.

The upper part of the barrel of the thickener 1 is provided with an upper group of mirabilite crystal slurry observation ports 2 and a lower group of mirabilite crystal slurry observation ports 2, and the thickness of slurry is controlled by controlling the height of the decahydrate crystal slurry. The upper and lower two groups of mirabilite crystal slurry observation ports 2 are provided with four transparent glass sight glasses in total, and two transparent glass sight glasses are oppositely opened at each group of mirabilite crystal slurry observation ports 2.

In order to facilitate the control of Na in the solid-containing high-nitrate solution₂SO₄The temperature difference controller is connected between the melting zone 4 and the melting mixer 6, and a flow regulator for realizing the flow diversion of two paths of the molten saltpeter liquid pipeline 8 is connected beside the molten saltpeter liquid pipeline 8.

The utility model discloses a melt nitre equipment with separation sodium sulfate decahydrate magma function, its work flow is as follows:

thickening: mirabilite slurry from the membrane-process denitration freezing unit is injected into the inner cavity of the barrel of the thickener 1 from a mirabilite slurry feeding port 102 by a mirabilite pump, mirabilite crystals are gradually concentrated in the central area of the bottom of the crystal slurry storage area 100 under the action of a low-speed rotating scraper 101, and the mirabilite slurry is further thickened to be thick and uniform. About 2-3 hours, the crystal slurry containing about 10 percent of crystal slurry can be thickened to about 80 percent. As the magma containing about 80% of solids can be formed and accumulated, a centrifuge is omitted, and the thickened magma has the characteristic of partial solid state and has certain fluidity. The compactness of the magma is already fully capable of isolating the liquid penetration, so that the weak brine supernatant is concentrated upwards in the upper region of the thickener 1.

Nitrate melting: and after thickening is finished, nitrate melting is started. One path of the molten mirabilite liquid enters the melting zone 4 and contacts the sodium sulfate decahydrate crystal slurry stored in the crystal slurry storage zone 100 from bottom to top, the crystal slurry is melted at the contact surface of the crystal slurry and the molten mirabilite liquid, the molten mirabilite slurry enters the melting zone 4 through the holes of the metal wire mesh 301, and the sodium sulfate decahydrate crystal slurry in the crystal slurry storage zone 100 moves downwards by gravity to continue to be molten; the other path of molten saltpeter liquid enters a mixer 6 to be mixed and molten with saltpeter slurry settled from the melting zone 4, and the mirabilite decahydrate is completely melted in the mixer 6 to form a solution containing solid high saltpeter, so as to enter the next working procedure.

With the continuous addition of mirabilite slurry, under the rotary stirring of a rotary scraper 2 of a thickener 1, solid mirabilite in the mirabilite magma gradually thickens and moves downwards, clear solution light salt water moves upwards and is concentrated in the upper area of the thickener 1, clear solution overflows from an overflow port 103 and is recycled, and the flow of the slurry entering the mirabilite thickener 1 is adjusted to control the interface of the clear solution and a solid phase area between an upper mirabilite magma observation port and a lower mirabilite magma observation port 2 so as to stabilize the thickness of the mirabilite slurry and the sodium sulfate content in molten mirabilite magma.

Example two

Second embodiment on the basis of the first embodiment, three openings are formed on the support plate 300 of the assembly 3 at positions corresponding to the molten saltpeter pipeline 8, and a wire mesh 301 is installed at the openings.

It should be noted that the number of the openings of the supporting plate 300 of the present invention is not limited to one illustrated in fig. 1 or three illustrated in fig. 3, and a plurality of openings may be provided according to the output of the glauber salt, and the wire mesh 301 is installed at the openings to retain the solid glauber's salt crystals.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

In addition to the technical features described in the specification, the technology is known to those skilled in the art.

Claims

1. The utility model provides a melt nitre equipment with separation sodium sulfate decahydrate magma function which characterized in that includes:

the thickener (1) comprises a barrel body with a conical bottom, a crystal slurry storage area (100) is formed in the inner cavity of the barrel body, a mirabilite slurry feeding port (102) is formed in the top of the barrel body, mirabilite slurry from a membrane-method denitration freezing unit is injected into the barrel body through the mirabilite slurry feeding port (102), a clear liquid self-overflow port (103) is formed in the upper part of the barrel body, and a mirabilite slurry outlet (104) is formed in the bottom of the barrel body;

melt the nitre ware, melt the nitre ware and include melting zone (4), melt-mixing ware (6) and melt nitre liquid pipeline (8), melting zone (4) are located the below of thickener (1) bottom mirabilite ground paste export (104), and mirabilite ground paste export (104) department is equipped with sub-assembly (3) that backup pad (300) and wire mesh (301) constitute, and sub-assembly (3) are separated upper magma storage area (100) and lower part melting zone (4) mutually, and melt-mixing ware (6) are linked together through the lower part of nitre thick liquid flow pipeline (7) and melting zone (4), and melt nitre liquid pipeline (8) divide two tunnel:

one path of the molten sodium sulfate enters a melting zone (4) and contacts with sodium sulfate crystal slurry gathered in a crystal slurry storage zone (100) from bottom to top, the solid-liquid contact surface is melted, and the molten sodium sulfate slurry penetrates into the melting zone (4) from a gap of an assembly (3) consisting of a support plate (300) and a wire mesh (301); the other path enters a mixer (6) to be mixed and melted with the nitrate slurry settled from the melting zone (4) to form a solution containing solid high nitrate in the mixer (6) for entering the next working procedure.

2. The saltpeter melting equipment with the function of separating the mirabilite decahydrate crystal slurry is characterized in that the strength and the mesh number of the metal wire mesh (301) in the assembly (3) are the same as the strength and the mesh number of the solid mirabilite crystal which can be prevented from penetrating through the gap, and the saltpeter slurry with the reduced crystal compactness after the mirabilite crystal is partially melted can pass through the gap.

3. The mirabilite melting equipment with the function of separating the mirabilite decahydrate crystal slurry is characterized in that the support plate (300) in the assembly (3) covers the whole mirabilite slurry outlet (104), the position of the support plate (300) corresponding to the mirabilite melting liquid pipeline (8) is opened, and a wire mesh (301) is arranged at the opening to retain solid mirabilite crystals.

4. The mirabilite melting equipment with the function of separating the mirabilite decahydrate crystal slurry according to claim 3, wherein one path of the end of the mirabilite melting liquid pipeline (8) entering the melting zone (4) is connected with a spray head (5), the spray head (5) is positioned below the assembly (3), and the fluid spraying position of the spray head (5) is opposite to the position where the wire mesh (301) is installed.

5. The saltpeter melting equipment with the function of separating the mirabilite decahydrate crystal slurry is characterized in that a rotary scraper (101) is arranged in a cylinder body of the thickener (1) according to the claim 1, the claim 2 or the claim 4.

6. The mirabilite melting equipment with the function of separating the mirabilite decahydrate crystal slurry is characterized in that the rotary scraper (101) comprises a side scraper and a bottom scraper, the bottom scraper is arranged at the bottom of the barrel and is coaxial with the barrel, the side scraper is arranged on the side wall of the barrel, and the rotary scraper (101) is provided with scraper rake teeth (9).

7. The mirabilite melting equipment with the function of separating the mirabilite decahydrate crystal slurry is characterized in that the upper part of the barrel of the thickener (1) is provided with an upper mirabilite crystal slurry observation port and a lower mirabilite crystal slurry observation port (2) for controlling the height of slurry.

8. The mirabilite melting equipment with the function of separating the sodium sulfate decahydrate crystal mush according to claim 7, wherein the upper and lower two sets of mirabilite crystal mush observation ports (2) are provided with four transparent glass sight glasses in total, and two transparent glass sight glasses are split from each set of mirabilite crystal mush observation ports (2).

9. The saltpeter melting equipment with the function of separating the mirabilite decahydrate crystal slurry as claimed in claim 1, 2, 4, 6 or 8, wherein the saltpeter melting liquid in the saltpeter melting liquid pipeline (8) is a nitrate salt co-saturated solution.

10. The saltpeter melting equipment with the function of separating the mirabilite decahydrate crystal slurry as claimed in claim 1, 2, 4, 6 or 8, wherein a temperature difference controller is connected between the melting zone (4) and the mixer (6), and a flow regulator for realizing two-way flow diversion of the saltpeter melting pipeline (8) is connected beside the saltpeter melting pipeline (8).