CN113058301A - Method and system for filtering molten salt - Google Patents
Method and system for filtering molten salt Download PDFInfo
- Publication number
- CN113058301A CN113058301A CN202110262449.5A CN202110262449A CN113058301A CN 113058301 A CN113058301 A CN 113058301A CN 202110262449 A CN202110262449 A CN 202110262449A CN 113058301 A CN113058301 A CN 113058301A
- Authority
- CN
- China
- Prior art keywords
- molten salt
- asbestos
- shell
- filter body
- heating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/02—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/02—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration
- B01D24/20—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration the filtering material being provided in an open container
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
Abstract
The present disclosure relates to a method and system for filtering molten salts, the method comprising: the molten salt is filtered by passing it through an asbestos filter. The method and the system filter the high-temperature molten salt by adopting the asbestos, solve the problem that small-particle impurities cannot be filtered in the prior art, improve the filtering effect, have low price and greatly reduce the cost of a filtering device; the molten salt filtering system is simple in structure, convenient to operate and wide in application range.
Description
Technical Field
The disclosure relates to the field of high-temperature molten salt treatment, in particular to a method and a system for filtering molten salt.
Background
The theoretical decomposition voltage of the molten salt electrolyte is high, the ionic conductivity is good, and the molten salt electrolyte has good dissolution characteristics on raw materials, so that the molten salt electrolyte is widely applied to preparing metals and alloys by molten salt electrolysis, purifying metals by electrolytic refining, electroplating molten salt, extracting and purifying metals by molten salt, molten salt batteries, dry-process post-treatment of spent fuel and the like.
Before the molten salt is used, the molten salt needs to be purified, soluble substances in the molten salt can be deposited by a molten salt electrolysis method, but the deposits and insoluble impurities in the molten salt also need to be separated from the molten salt, and the filtration is needed; molten salt electrolysis is used for preparing metals and alloys, and if powdery products are obtained, the molten salt is required to be filtered to obtain the products. At present, the devices for filtering the molten salt are fewer, and certain problems exist.
For example, patent CN203829994U discloses a melting and filtering device for high-temperature molten salt, which is designed to discharge only impurities in the molten salt together with the molten salt at the bottom, and to remove impurities with density less than that of the molten salt, the device is complicated, and the waste of the molten salt is large.
Patent CN106283112A discloses an electrochemical purification method of molten salt, which only uses electrochemical method to electrolyze and deposit soluble metal cation and oxoanion impurities in the molten salt, and can not remove insoluble impurity particles existing in the molten salt, and part of the deposition product will drift in the molten salt.
Patent CN209092809U discloses a filter screen is used in processing of high temperature fused salt convenient to change, and it adopts the filter screen to filter the fused salt, nevertheless because the filter effect of filter screen receives the restriction of the technology of metal mesh, to present technology, 2000 meshes can only be accomplished at most to the metal mesh, and common about 600 meshes, and it can not filter the small-size impurity in the fused salt.
Disclosure of Invention
The method and the system for filtering the molten salt are simple and convenient, low in material and energy consumption and good in purification effect, and are used for efficiently treating impurities in the high-temperature molten salt.
In order to achieve the above object, the present disclosure provides a method of filtering molten salt, the method comprising: the molten salt is filtered by passing it through an asbestos filter.
Optionally, the asbestos filter body comprises one or more layers of asbestos; the porosity of the asbestos filter body is 80-90%, and the thickness of the asbestos filter body is 5-20 mm; the asbestos layer comprises one or more of serpentine asbestos, actinolite asbestos, rectus amphibole asbestos, blue asbestos, iron asbestos and tremolite asbestos;
preferably, the asbestos is a asbestos wool.
Optionally, the asbestos layer comprises a plurality of hollow fiber filament layers stacked, the hollow fiber filament layers comprising hollow fiber filaments having an average inner diameter of 8-10nm and an average outer diameter of 60-70nm, the hollow fiber filaments having an average length of 4-7.5mm and a structural water content of 10-15 wt%.
Optionally, the temperature of the molten salt is 400-800 ℃, and the flow rate is 0.05-0.5cm3/(cm2·s)；
The molten salt is selected from one or more of chloride molten salt, nitride molten salt, fluoride molten salt and carbonate molten salt.
Optionally, the method further comprises: placing the asbestos filter body inside a shell of a filter device; enabling the molten salt to enter the shell from a molten salt inlet at the upper part of the shell and flow through the asbestos filter body, and obtaining filtered molten salt from a molten salt outlet at the bottom of the shell;
the shell is made of one or more materials selected from alumina, stainless steel, graphite, boron nitride, nickel and platinum.
Optionally, the method further comprises: a heating and heat-preserving device is arranged outside the shell; the heating and heat-preserving device is selected from a shaft furnace and/or a muffle furnace;
the heating temperature of the heating and heat-preserving device is 5-20 ℃ higher than the temperature of the molten salt inlet.
Optionally, the housing is formed into a cylindrical housing, the axial direction of the cylindrical housing is arranged along the vertical direction, and the ratio of the axial height of the cylindrical housing to the thickness of the asbestos filter body is (10-20): 1; optionally, the cylindrical shell is formed into a frustum-shaped shell with an inner diameter gradually reduced from top to bottom, and the inner diameter of the bottom end of the frustum-shaped shell is 5-20 cm;
preferably, the molten salt outlet of the housing is formed as one or more circular micro-holes having a diameter of 2-10 mm; optionally, the distance between the centers of two adjacent round micropores is 5-15 mm;
optionally, the method further comprises flowing the filtered molten salt into a holding tank; the collecting tank is made of one or more materials selected from alumina, stainless steel, graphite, boron nitride, nickel and platinum.
A second aspect of the present disclosure provides a system for filtering molten salt, the system comprising a housing and an asbestos filter body; the top end of the shell is provided with a molten salt inlet, and the bottom wall of the shell is provided with a molten salt outlet; the asbestos filter body is arranged inside the shell.
Optionally, the material of the shell is selected from one or more of alumina, stainless steel, graphite, boron nitride, nickel and platinum;
the shell is formed into a cylindrical shell, the axial direction of the cylindrical shell is arranged along the vertical direction, and the ratio of the axial height of the cylindrical shell to the thickness of the asbestos filter body is (10-20): 1; optionally, the cylindrical shell is formed into a frustum-shaped shell with an inner diameter gradually reduced from top to bottom, and the inner diameter of the bottom end of the frustum-shaped shell is 5-20 cm;
preferably, the molten salt outlet of the housing is formed as one or more circular micro-holes having a diameter of 2-10 mm; optionally, the distance between centers of two adjacent round micropores is 5-15 mm.
Optionally, the system further comprises a collecting tank and/or a heating and heat-preserving device; the collecting tank is arranged below the shell, and a notch of the collecting tank faces to a molten salt outlet of the shell; the collecting tank is made of one or more materials selected from alumina, stainless steel, graphite, boron nitride, nickel and platinum;
the heating and heat-preserving device is arranged outside the shell and used for heating the molten salt in the shell; the heating and heat preservation device is selected from a shaft furnace and/or a muffle furnace.
The method and the system disclosed by the invention have the advantages that the asbestos is adopted to filter the high-temperature molten salt, the problem that small-particle impurities cannot be filtered in the prior art is solved, the filtering effect is improved, the price of the asbestos is low, and the cost of a filtering device is greatly reduced; the molten salt filtering system is simple in structure, convenient to operate and wide in application range.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a schematic diagram of a system for filtering molten salt in one embodiment of the present disclosure.
Description of the reference numerals
1. A shell, 2, an asbestos filter body, 4 and a collecting tank
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
In the present disclosure, where the contrary is not stated, the use of directional words such as "upper and lower" generally refers to the upper and lower positions of the device in normal use, for example with reference to the orientation of the drawing in fig. 1, "inner and outer" refer to the outline of the device. In the description of the present disclosure, "a number" means two or more unless specifically limited otherwise.
As shown in fig. 1, a first aspect of the present disclosure provides a method of filtering molten salt, the method comprising: molten salt is filtered by passing it through the asbestos filter body 2.
The method disclosed by the invention has the advantages that the asbestos is adopted to filter the high-temperature molten salt, the problem that small-particle impurities cannot be filtered in the prior art is solved, the filtering effect is improved, the price of the asbestos is low, and the cost of the filtering device is greatly reduced.
In one embodiment according to the present disclosure, in order to efficiently filter impurities in the high-temperature molten salt, an asbestos filter 2 composed of one or more asbestos layers may be used to filter the high-temperature molten salt layer by layer to improve the impurity filtering efficiency.
Further, the asbestos filter body 2 may have a porosity of 80-90%, preferably 85-90%. In one embodiment, one or a plurality of stacked asbestos sheets may be placed in the filter apparatus and subjected to a micropressure to bring the porosity of the asbestos filter body within the above-described preferred range. The asbestos filter body within the preferred porosity range has better filtering effect and filtering efficiency on high-temperature molten salt.
Further, the thickness of the asbestos filter body 2 may be 5-20mm, preferably 10-15mm, the thickness of the asbestos filter body 2 in the present disclosure referring to the distance in the vertical direction through which the molten salt flows in the asbestos filter body. In the embodiment in which the asbestos layer after the micropressure is placed in the filter device to obtain the asbestos filter, the thickness refers to the thickness of the asbestos filter 2 after compression.
In one embodiment according to the present disclosure, the asbestos layer may comprise one or more of serpentine asbestos, actinolite asbestos, rectus amphibole asbestos, chrysotile asbestos, ferroasbestos, and tremolite asbestos; preferably, the asbestos may be a asbestos wool.
In a further embodiment, in order to further enhance the effect of the asbestos layer in filtering small particle impurities, the asbestos layer may include a plurality of hollow fiber filament layers stacked, and the hollow fiber filament layers may include hollow fiber filaments having an average inner diameter of 8 to 10nm and an average outer diameter of 60 to 70nm, and preferably, may include hollow fiber filaments having an average inner diameter of 8 to 9nm and an average outer diameter of 65 to 70 nm; the average length of the hollow fiber filaments may be 4 to 7.5mm, preferably 4 to 7mm, and the structural water content may be 10 to 15%, preferably 10 to 14%. Wherein, the average inner diameter means the average value of the inner diameters of the hollow fiber filaments; the average outer diameter means the average value of the outer diameters of the hollow fiber filaments; average length means the length of the hollow fiber filaments averaged.
In one embodiment according to the present disclosure, the temperature of the molten salt may be 400-3/(cm2S) flow rate, which may preferably be from 0.2 to 0.3cm3/(cm2S) to filter impurities in the high temperature molten salt sufficiently; preferably, the molten salt of the present disclosure may be selected from one or more of chloride molten salt, nitride molten salt, fluoride molten salt, and carbonate molten salt, for example, LiCl-KCl mixed molten salt, Li2CO3-K2CO3Mixed molten salt or LiF-KF mixed molten salt.
In one embodiment according to the present disclosure, as shown in fig. 1, an asbestos filter body 2 may be placed inside a casing 1 of the filtering device; enabling the molten salt to enter the shell 1 from a molten salt inlet at the upper part of the shell 1 and flow through the asbestos filter body 2, and obtaining filtered molten salt from a molten salt outlet at the bottom of the shell 1; the material of the housing 1 is not limited in the present disclosure, and may be, for example, one or more selected from alumina, stainless steel, graphite, boron nitride, nickel, and platinum.
In order to keep the molten salt in a molten state all the time during the filtration process, in one embodiment according to the present disclosure, the exterior of the housing 1 may be provided with a heating and heat-preserving device; the heating and heat preservation device can be selected from a shaft furnace and/or a muffle furnace, and is preferably a shaft furnace; in a preferred embodiment, the heating temperature of the heating and holding device may be 5 to 20 ℃ higher, preferably 5 to 15 ℃ higher, than the temperature of the molten salt inlet.
In one embodiment according to the present disclosure, as shown in fig. 1, the housing 1 may be formed as a cylindrical housing, an axial direction of the cylindrical housing is disposed in a vertical direction, and a ratio of an axial height of the cylindrical housing to a thickness of the asbestos filter body may be (10-20): 1, preferably may be (10-15): 1; alternatively, the cylindrical shell is formed as a frustum-shaped shell with an inner diameter gradually decreasing from top to bottom to increase the pressure at the molten salt outlet at the bottom of the shell 1 for more efficient filtration of impurities, and the inner diameter at the bottom end of the frustum-shaped shell may be 5-20cm, preferably 10-15 cm.
In a further embodiment, the molten salt outlet of the housing 1 may be formed as one or more micro-holes to allow the filtered high-temperature molten salt to smoothly flow out, and the shape of the micro-holes is not limited by the present disclosure, and preferably, the micro-holes may be circular micro-holes, and the diameter of the circular micro-holes may be 2 to 10mm, and preferably, may be 2 to 5 mm; alternatively, the distance between the centers of two adjacent circular micropores can be 5-15mm, and preferably can be 5-10 mm.
In one embodiment according to the present disclosure, as shown in fig. 1, the method may further comprise flowing the filtered molten salt into a holding tank 4 for collection of the filtered clarified molten salt; the material of the collecting vessel 4 may be selected conventionally in the art, and may be selected from one or more of alumina, stainless steel, graphite, boron nitride, nickel and platinum, for example.
As shown in fig. 1, a second aspect of the present disclosure provides a system for filtering molten salt, the system comprising a housing 1 and an asbestos filter body 2; the top end of the shell 1 is provided with a molten salt inlet, and the bottom wall of the shell 1 is provided with a molten salt outlet; the asbestos filter 2 is disposed inside the casing 1.
The system disclosed by the invention adopts asbestos to filter the high-temperature molten salt, so that the problem that small-particle impurities cannot be filtered in the prior art is solved, the filtering effect is improved, the price of the asbestos is low, and the cost of a filtering device is greatly reduced; the molten salt filtering system is simple in structure, convenient to operate and wide in application range.
In one embodiment according to the present disclosure, the material of the housing 1 may be one or more selected from alumina, stainless steel, graphite, boron nitride, nickel and platinum; as shown in fig. 1, the housing 1 may be formed as a cylindrical housing, an axial direction of the cylindrical housing being disposed in a vertical direction, and a ratio of an axial height of the cylindrical housing to a thickness of the asbestos filter body 2 may be (10-20): 1, preferably may be (10-15): 1; alternatively, the cylindrical shell is formed as a frustum-shaped shell with an inner diameter gradually decreasing from top to bottom to increase the pressure at the molten salt outlet at the bottom of the shell 1 for more efficient filtration of impurities, and the inner diameter at the bottom end of the frustum-shaped shell may be 5-20cm, preferably 10-15 cm.
In a further embodiment, the molten salt outlet of the housing 1 may be formed as one or more micro-holes to allow the filtered high-temperature molten salt to smoothly flow out, and the shape of the micro-holes is not limited by the present disclosure, and preferably, the micro-holes may be circular micro-holes, and the diameter of the circular micro-holes may be 2 to 10mm, and preferably, may be 2 to 5 mm; alternatively, the distance between the centers of two adjacent circular micropores can be 5-15mm, and preferably can be 5-10 mm.
In one embodiment according to the present disclosure, as shown in fig. 1, the system may further include a collecting tank 4 to filter the filtered high-temperature molten salt, and/or a heating and heat-preserving device to keep the molten salt in a molten state during the filtering process; further, the collecting gutter 4 may be disposed below the casing 1, with a notch of the collecting gutter 4 facing the molten salt outlet of the casing 1; the material of the collecting tank 2 can be one or more selected from alumina, stainless steel, graphite, boron nitride, nickel and platinum; the heating and heat-preserving device is arranged outside the shell and used for heating the molten salt in the shell; the heating and heat preservation device is selected from a shaft furnace and/or a muffle furnace.
The present disclosure is further illustrated by the following examples, but is not to be construed as being limited thereby.
In the following examples, the method for measuring the porosity of the asbestos filter 2 was an archimedes method, and the instrument used was a bestridi instrument (model BSD-TD1, available from bestridi instruments technologies (beijing) ltd); the method for measuring the average inner diameter and the average outer diameter of the hollow fiber wire is a microscope projection amplification measuring method adopting an electronic ruler to count in groups, the adopted instrument is an optical microscope (model is Ginshi TM-3000 series, purchased from Ginshi (China) Co., Ltd.), the average inner diameter refers to the average value of the inner diameter of the hollow fiber wire, and the average outer diameter refers to the average value of the outer diameter of the hollow fiber wire; the average length of the hollow fiber is measured by a Rolafa method, the instrument is a roller type fiber length analyzer (model Y111, purchased from Beijing Rayleigh analysis instruments Co., Ltd.), and the average length refers to the length of the hollow fiber and is averaged; the method for measuring the structural water content of the hollow fiber yarn is a burning decrement method.
In the following examples and comparative examples, the method for determining the efficiency of removing impurities from a clarified molten salt was a high temperature distillation method, specifically: firstly, high-temperature distillation is carried out on a certain weight of high-temperature molten salt containing small-particle impurities, and the weight of the rest fraction is weighed, so that the weight of the small-particle impurities in the high-temperature molten salt is obtained; secondly, distilling the filtered clarified molten salt at high temperature, and weighing the weight of the rest fraction to obtain the weight of small particle impurities in the clarified molten salt; thirdly, multiplying the value of [ 1- (the weight of the small-particle impurities in the clarified molten salt/the weight of the small-particle impurities in the high-temperature molten salt) ] by 100 percent to obtain the impurity removal efficiency of the clarified molten salt;
the method for determining the minimum particle size of the molten salt impurity particles capable of being filtered comprises the following steps: and (4) taking out the residual fraction of the clarified molten salt obtained in the step (II), and measuring the particle size of small particle impurities in the residual fraction.
Example 1
As shown in fig. 1, is a schematic view of a system for filtering molten salts of the present disclosure, the system comprising: the device comprises a shell 1, an asbestos filter body 2, a collecting tank 4 and a heating and heat-preserving device; wherein the content of the first and second substances,
the top of casing 1 is equipped with the fused salt entry, and this casing 1 is the cylinder casing, and the axial of cylinder casing sets up along vertical direction, and the ratio of the axial height of cylinder casing and the thickness of asbestos filter body 2 is 10: 1; the bottom wall of the shell 1 is provided with a molten salt outlet, the molten salt outlet is formed into one or more circular micropores, the diameter of each circular micropore is 2mm, the distance between the centers of two adjacent circular micropores is 5mm, and the shell 1 is made of alumina;
the asbestos filter body 2 is arranged inside the shell 1, and the asbestos filter body 2 comprises two asbestos layers; the asbestos filter body 2 has the porosity of 90 percent and the thickness of 10mm, and the asbestos layer is made of a blue asbestos material; the asbestos layer comprises a plurality of laminated hollow fiber layers, each hollow fiber layer comprises hollow fibers with the average inner diameter of 8nm and the average outer diameter of 60nm, the average length of each hollow fiber is 5mm, and the structural water content is 14%;
the collecting tank 4 is arranged below the shell 1, the notch of the collecting tank 4 faces the molten salt outlet of the shell, and the collecting tank 2 is made of alumina;
the heating and heat-preserving device is a pit furnace (the heating temperature is 500 ℃), is arranged outside the shell 1 and is used for heating the fused salt in the shell.
LiCl-KCl (40g) is weighed and put into a corundum crucible for melting, a double-electrode system (tungsten wire-graphite) constant current 1A is adopted for electrolysis for 10 minutes, the molten salt becomes turbid due to the existence of a large amount of small particle impurities (such as lithium metal), and the turbid molten salt is poured into a filtering device for filtering (the temperature of the molten salt is 500 ℃, and the flow rate is 0.2 cm)3/(cm2S)). After the filtration is completed, the molten salt collected in the collection tank 4 becomes clarified again. The minimum particle size of the molten salt impurity particles capable of being filtered by the method is 0.1 mu m, and the impurity removal efficiency in the clarified molten salt is 99.9%.
Example 2
The method of example 1 was used to perform filtration of high temperature molten salts, with the only difference that: the asbestos filter body 2 has the porosity of 85 percent and the thickness of 15mm, and the asbestos layer is made of a blue asbestos material; the asbestos layer comprises a plurality of laminated hollow fiber layers, wherein each hollow fiber layer comprises hollow fibers with the average inner diameter of 9nm and the average outer diameter of 70nm, the average length of the hollow fibers is 4mm, and the structural water content is 13%.
The method of the embodiment can filter the impurity particles of the molten salt with the minimum particle size of 0.15 mu m, and the impurity removal efficiency in the clarified molten salt is 99.99%.
Example 3
The method of example 1 was used to perform filtration of high temperature molten salts, with the only difference that: the asbestos filter body 2 has the porosity of 80 percent and the thickness of 2mm, and the asbestos layer is made of serpentine asbestos; the asbestos layer comprises a plurality of laminated hollow fiber layers, wherein each hollow fiber layer comprises hollow fibers with the average inner diameter of 20nm and the average outer diameter of 40nm, the average length of the hollow fibers is 2mm, and the structural water content is 20%.
The minimum particle size of the molten salt impurity particles capable of being filtered by the method is 0.5 mu m, and the impurity removal efficiency in the clarified molten salt is 98%.
Comparative example 1
The method of example 1 was used to perform filtration of high temperature molten salts, with the only difference that: adopt the high temperature fused salt processing that is convenient for change that patent CN209092809U disclosed to filter the high temperature fused salt in embodiment 1, wherein the material of filter screen is the stainless steel, and the aperture is 600 meshes.
The method of the embodiment can filter the impurity particles of the molten salt with the minimum particle size of 20 mu m, and the impurity removal efficiency in the clarified molten salt is 95%.
Comparative example 2
The method of example 1 was used to perform filtration of high temperature molten salts, with the only difference that: the asbestos filter body 2 consisting of hollow fiber filaments was replaced with a filter body consisting of 018 glass fiber cloth (thickness 0.4mm, average length of glass fibers 50mm, average fineness 20 μm).
The minimum particle size of the molten salt impurity particles capable of being filtered by the method is 0.3 mu m, and the impurity removal efficiency in the clarified molten salt is 97 percent.
As can be seen from the above embodiments and comparative examples, the method and system of the present disclosure can solve the problem that the prior art cannot filter small particle impurities by filtering the high temperature molten salt with asbestos, and improve the filtering effect by filtering the high temperature molten salt layer by layer, and the cost of the filtering apparatus is greatly reduced because the asbestos is cheap; the molten salt filtering system is simple in structure, convenient to operate and wide in application range.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A method of filtering molten salt, the method comprising: molten salt is filtered by passing through the asbestos filter body (2).
2. The method according to claim 1, wherein the asbestos filter body (2) comprises one or more layers of asbestos; the asbestos filter body (2) has the porosity of 80-90% and the thickness of 5-20 mm; the asbestos layer comprises one or more of serpentine asbestos, actinolite asbestos, rectus amphibole asbestos, blue asbestos, iron asbestos and tremolite asbestos;
preferably, the asbestos is a asbestos wool.
3. The method according to claim 2, wherein the asbestos layer comprises a plurality of hollow fiber filament layers stacked, the hollow fiber filament layers comprising hollow fiber filaments having an average inner diameter of 8 to 10nm and an average outer diameter of 60 to 70nm, the hollow fiber filaments having an average length of 4 to 7.5mm and a structural water content of 10 to 15 wt%.
4. The method as claimed in claim 1, wherein the molten salt has a temperature of 400-800 ℃ and a flow rate of 0.05-0.5cm3/(cm2·s)；
The molten salt is selected from one or more of chloride molten salt, nitride molten salt, fluoride molten salt and carbonate molten salt.
5. The method of claim 1, wherein the method further comprises: placing the asbestos filter body (2) inside a shell (1) of a filter device; the molten salt enters the shell (1) from a molten salt inlet at the upper part of the shell (1) and flows through the asbestos filter body (2), and filtered molten salt is obtained from a molten salt outlet at the bottom of the shell (1);
the shell (1) is made of one or more materials selected from alumina, stainless steel, graphite, boron nitride, nickel and platinum.
6. The method of claim 5, wherein the method further comprises: a heating and heat-preserving device is arranged outside the shell (1); the heating and heat-preserving device is selected from a shaft furnace and/or a muffle furnace;
the heating temperature of the heating and heat-preserving device is 5-20 ℃ higher than the temperature of the molten salt inlet.
7. The method according to claim 5, wherein the casing (1) is formed as a cylindrical casing, the axial direction of which is arranged in a vertical direction, the ratio of the axial height of the cylindrical casing to the thickness of the asbestos filter body being (10-20): 1; optionally, the cylindrical shell is formed into a frustum-shaped shell with an inner diameter gradually reduced from top to bottom, and the inner diameter of the bottom end of the frustum-shaped shell is 5-20 cm;
preferably, the molten salt outlet of the housing (1) is formed as one or more circular micro-holes having a diameter of 2-10 mm; optionally, the distance between the centers of two adjacent round micropores is 5-15 mm;
optionally, the method further comprises flowing the filtered molten salt into a collection tank (4); the collecting tank (4) is made of one or more materials selected from alumina, stainless steel, graphite, boron nitride, nickel and platinum.
8. A system for filtering molten salts, characterized in that it comprises a casing (1) and an asbestos filter body (2); a molten salt inlet is formed in the top end of the shell (1), and a molten salt outlet is formed in the bottom wall of the shell (1); the asbestos filter body (2) is arranged inside the shell (1).
9. The system according to claim 8, wherein the material of the shell (1) is selected from one or more of alumina, stainless steel, graphite, boron nitride, nickel and platinum;
the shell (1) is formed into a cylindrical shell, the axial direction of the cylindrical shell is arranged along the vertical direction, and the ratio of the axial height of the cylindrical shell to the thickness of the asbestos filter body (2) is (10-20): 1; optionally, the cylindrical shell is formed into a frustum-shaped shell with an inner diameter gradually reduced from top to bottom, and the inner diameter of the bottom end of the frustum-shaped shell is 5-20 cm;
preferably, the molten salt outlet of the housing (1) is formed as one or more circular micro-holes having a diameter of 2-10 mm; optionally, the distance between centers of two adjacent round micropores is 5-15 mm.
10. System according to claim 8, wherein the system further comprises a collection tank (4) and/or a heating and incubation device; the collecting tank (4) is arranged below the shell (1), and the notch of the collecting tank (4) faces to the molten salt outlet of the shell (1); the collecting tank (2) is made of one or more materials selected from alumina, stainless steel, graphite, boron nitride, nickel and platinum;
the heating and heat-preserving device is arranged outside the shell (1) and is used for heating the molten salt in the shell (1); the heating and heat preservation device is selected from a shaft furnace and/or a muffle furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110262449.5A CN113058301A (en) | 2021-03-10 | 2021-03-10 | Method and system for filtering molten salt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110262449.5A CN113058301A (en) | 2021-03-10 | 2021-03-10 | Method and system for filtering molten salt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113058301A true CN113058301A (en) | 2021-07-02 |
Family
ID=76560290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110262449.5A Pending CN113058301A (en) | 2021-03-10 | 2021-03-10 | Method and system for filtering molten salt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113058301A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113336255A (en) * | 2021-08-05 | 2021-09-03 | 天津包钢稀土研究院有限责任公司 | Purification method of rare earth halide molten salt |
| CN114984634A (en) * | 2022-05-20 | 2022-09-02 | 中国原子能科学研究院 | Molten salt filtering system and filtering method |
| CN116119702A (en) * | 2022-12-27 | 2023-05-16 | 奕瑞新材料科技（太仓）有限公司 | Preparation method of high-purity anhydrous strontium iodide |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008068192A (en) * | 2006-09-13 | 2008-03-27 | Nippon Steel Engineering Co Ltd | Asbestos waste treatment apparatus and method |
| CN109011696A (en) * | 2018-07-25 | 2018-12-18 | 中国科学院上海应用物理研究所 | The purification method of insoluble impurities in a kind of fused salt |
| CN109758779A (en) * | 2019-03-18 | 2019-05-17 | 中国原子能科学研究院 | A kind of purification method of radioactivity electrolysis abraum salt |
-
2021
- 2021-03-10 CN CN202110262449.5A patent/CN113058301A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008068192A (en) * | 2006-09-13 | 2008-03-27 | Nippon Steel Engineering Co Ltd | Asbestos waste treatment apparatus and method |
| CN109011696A (en) * | 2018-07-25 | 2018-12-18 | 中国科学院上海应用物理研究所 | The purification method of insoluble impurities in a kind of fused salt |
| CN109758779A (en) * | 2019-03-18 | 2019-05-17 | 中国原子能科学研究院 | A kind of purification method of radioactivity electrolysis abraum salt |
Non-Patent Citations (2)
| Title |
|---|
| 《化学工程手册》编辑委员会: "《化学工程手册 第22篇 液固分离》", 30 October 1989 * |
| 冯春宇等: "《固液分离原理与工业水处理装置》", 31 January 2017 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113336255A (en) * | 2021-08-05 | 2021-09-03 | 天津包钢稀土研究院有限责任公司 | Purification method of rare earth halide molten salt |
| CN113336255B (en) * | 2021-08-05 | 2021-10-29 | 天津包钢稀土研究院有限责任公司 | Purification method of rare earth halide molten salt |
| CN114984634A (en) * | 2022-05-20 | 2022-09-02 | 中国原子能科学研究院 | Molten salt filtering system and filtering method |
| CN114984634B (en) * | 2022-05-20 | 2023-05-23 | 中国原子能科学研究院 | Molten salt filtering system and filtering method |
| CN116119702A (en) * | 2022-12-27 | 2023-05-16 | 奕瑞新材料科技（太仓）有限公司 | Preparation method of high-purity anhydrous strontium iodide |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113058301A (en) | Method and system for filtering molten salt | |
| CN101928964B (en) | Method for directly preparing Ti5Si3 high-temperature alloy from titaniferous blast furnace slag and electrolytic bath device thereof | |
| CN209612365U (en) | The filtering and purifying of solid inclusions in a kind of removal fused salt | |
| CN209778546U (en) | novel three-dimensional electrode water treatment system | |
| CN106098130B (en) | A kind of method that electroreduction processing low concentration uranium-bearing wastewater produces uranium oxide | |
| CN113165916A (en) | Device for purifying a fluid, in particular waste water | |
| CN103225102B (en) | Remove the equipment of harmful impurities from chromeplating solution | |
| WO2019240472A1 (en) | Composite oxide-coated electroconductive separation membrane for water treatment and manufacturing method therefor | |
| KR20150005913A (en) | Process for manufacturing porous carbon material | |
| KR101553739B1 (en) | Electrochemical Device for Recovering Uranium | |
| CN113332787B (en) | Filtration purification device of tombarthite chloride fused salt | |
| CN208594339U (en) | A kind of copper recovery system of sulfuric acid copper etchant solution | |
| CN106053175A (en) | Simple method for extracting carbides in tool steel | |
| US20080308413A1 (en) | Electrochemical Deposition of Compounds in a Continuous Flow of Liquid | |
| CN101514057A (en) | Method for recycling textile, printing and dyeing wastewater | |
| CN209646149U (en) | A kind of electricity bag compound dust-collection device | |
| CH686626A5 (en) | Process for the direct electrochemical refining of copper scrap. | |
| JP6532051B2 (en) | Separation and recovery method of platinum group material and separation and recovery apparatus therefor | |
| CN209507838U (en) | A kind of sewage disposal system | |
| CN209968011U (en) | Waste gas treatment device for refractory material kiln | |
| CN209243235U (en) | The offline care device of plating solution | |
| CN209138283U (en) | A kind of emission-control equipment of graphitizing furnace | |
| CN214361747U (en) | High-purity copper electrolyte purifier | |
| CN212998773U (en) | Sewage depth filtering device | |
| CN216855927U (en) | Waste glaze recovery system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210702 |