CN106731216A - A kind of Multifunctional water purification filter core and preparation method thereof - Google Patents
A kind of Multifunctional water purification filter core and preparation method thereof Download PDFInfo
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- CN106731216A CN106731216A CN201710062606.1A CN201710062606A CN106731216A CN 106731216 A CN106731216 A CN 106731216A CN 201710062606 A CN201710062606 A CN 201710062606A CN 106731216 A CN106731216 A CN 106731216A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/02—Loose filtering material, e.g. loose fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/02—Types of fibres, filaments or particles, self-supporting or supported materials
- B01D2239/0216—Bicomponent or multicomponent fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/04—Additives and treatments of the filtering material
- B01D2239/0407—Additives and treatments of the filtering material comprising particulate additives, e.g. adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/04—Additives and treatments of the filtering material
- B01D2239/0414—Surface modifiers, e.g. comprising ion exchange groups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/12—Special parameters characterising the filtering material
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- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention discloses a kind of Multifunctional water purification filter core, mainly it is prepared from by the raw material of following percentage by weight：The attapulgite of 100 mesh~300 mesh 15% 45%；The NACF 15%~35% of 100 mesh~300 mesh；The novel water filter material 15%~60% of 100 mesh~300 mesh；The fiber binder 5%~40% of 100 mesh~300 mesh；Wherein, the novel water filter material is ion-exchange fibre or montmorillonite.After adopting the above technical scheme, the attapulgite and NACF in the present invention are respectively provided with suction-operated, attapulgite and new filtering material are respectively provided with ion-exchange capacity；Fiber binder contributes to shaping, prevents finished product from deforming shrink etc. in use.Compared with traditional filter core, the present invention has multifunctionality, not only with suction-operated and mechanical interception ability, also have stronger ion exchange hot, adsorption capacity greatly, improves water treatment capacity, and preferably remain the structure of filter core micropore in threadiness after processing.
Description
Technical field
The invention belongs to filtering material technical field, it is related to a kind of new Multifunctional water purification filter core.
Background technology
In water treatment system, water is pre-processed frequently with activated carbon, the common filtering element for treating water kind of in the market compared with
For single, usually active carbon filter core, polypropylene melt blown filter or ceramic element etc..Although traditional active carbon filter core has
Good suction-operated, the chlorine residue that can effectively go in water removal, peculiar smell and color etc., polypropylene melt blown filter and ceramic element are then right
The filter effect of the magazine such as silt or suspension is preferable.Above-mentioned common filtering element for treating water is to heavy-metal ion removal and agricultural chemicals
It is very limited etc. ability, ion-exchange capacity lacks etc..
Attapulgite refers to a kind of clay mineral with attapulgite as key component, and attapulgite is also known as palygorskite or slope
Thread thin white silk used in ancient China stone, is a kind of clay mineral of zeopan containing Shuifu County for having chain layer structure.Because attapulgite has unique crystalline substance
Body structure, is allowed to cation interchangeability, water imbibition, adsorption bleaching, big specific surface area and colloid index and expansion
Physical and chemical performance and the processing performances such as appearance.
Montmorillonite also known as kaolinite, are the layer minerals being made up of the superfine hydrous alumino silicates of particle, and centre is alumina
Octahedron, the clay mineral of the three-layer tablet shape structure being made up of silicon-oxy tetrahedron up and down is aqueous and one in crystal structure interlayer
A little exchange cations, have ion exchange capacity higher, with water swelling ability higher.
Ion-exchange fibre, the ion on its fiber can be made selectively to exchange with the ion in solution, be widely used in
Desalinization etc..Can be used for Adsorption of Heavy Metals and pigment and specific surface is big, ion-exchange speed fast, easily regeneration, have very to waste water
Good decolorizing effect.
Therefore, above-mentioned Novel filtration water material above has great application prospect in the application of water process.
The processing method of traditional filter core is generally using extrusion forming or the processing method of sinter molding.In extrusion forming
In processing, curable type generally is aided in added with glue, this glue easily blocks filter core micropore, can destroy 70% micropore, and filter material is to water
Resistance become big.Water-flowing amount diminishes, and hydrophily is deteriorated, and causes the filter core after extrusion forming is processed, and its water-flowing amount is low, filtering
Efficiency is low.In sinter molding processing, curable type is generally aided in using binding agent, after through high-temperature activation, block filter core micropore, it is right
The resistance of water becomes big.Water-flowing amount diminishes, and hydrophily is deteriorated, and causes that the filter efficiency of filter core is low, and effect is poor.
Therefore, it is necessary to studying one kind can largely keep filter core micropore, the processing method of the preferable filter core of hydrophily.
The content of the invention
In view of this, it is an object of the invention to provide a kind of Multifunctional water purification filter core, not only with suction-operated, machinery
Interdiction capability, also with stronger ion exchange property.
In order to reach above-mentioned purpose, the technical scheme is that：
A kind of Multifunctional water purification filter core, is mainly prepared from by the raw material of following percentage by weight：
The attapulgite 15%-45% of 100 mesh~300 mesh；
The NACF 15%~35% of 100 mesh~300 mesh；
The novel water filter material 15%~60% of 100 mesh~300 mesh；
The fiber binder 5%~40% of 100 mesh~300 mesh；
Wherein, the novel water filter material is ion-exchange fibre and/or montmorillonite.
Mainly it is prepared from by the raw material of following percentage by weight：
Attapulgite 20%-45% described in 100 mesh~300 purposes；
NACF 15%~35% described in 100 mesh~300 purposes；
Ion-exchange fibre 15%~25% described in 100 mesh~300 purposes；
Fiber binder 15%~35% described in 100 mesh~300 purposes.
Mainly it is prepared from by the raw material of following percentage by weight：
Attapulgite 15%-25% described in 100 mesh~300 purposes；
NACF 15%~25% described in 100 mesh~300 purposes；
Montmorillonite 35%~50% described in 100 mesh~300 purposes；
Fiber binder 15%~33% described in 100 mesh~300 purposes.
Mainly it is prepared from by the raw material of following percentage by weight：
The attapulgite 20%-30% of 100 mesh~300 mesh；
The NACF 20%~30% of 100 mesh~300 mesh；
The novel water filter material 20%~55% of 100 mesh~300 mesh；
The fiber binder 5%~15% of 100 mesh~300 mesh；
Wherein, the novel water filter material is the ion-exchange fibre and/or the montmorillonite.
The fiber binder name of an article is BiPUL 50TWG, and spinning Co., Ltd. by Japanese Japan provides.
A kind of preparation method of Multifunctional water purification filter core, comprises the following steps：
(1) attapulgite, the NACF of 100 mesh~300 mesh, 100 mesh~300 purposes of 100 mesh~300 mesh are prepared
The fiber binder of novel water filter material, 100 mesh~300 mesh；
(2) stir：Raw material input temporary storage tank is carried out in mixing and stirring, temporary storage tank added with pure water, it is described
The amount of pure water is 15-22 with raw material otal investment ratio：1, the original slurry material of sticky shape is formed after stirring；
(3) it is molded：By step 2) obtained by original slurry material wet type shaped device be delivered to by pipe-line transportation system enter successively
Row suction and integer, and then be molded, obtain first product；Or, by step 2) obtained by original slurry material by pipe-line transportation system convey
Forming processes are carried out to moulding machine, first product is obtained；
(4) dry：By step 2) obtained by first product be sent to baking oven, at a temperature of 100~130 DEG C, dry 6~10 small
When, obtain finished product.
The wet type shaped device uses suction feeder, during the suction, according to suction amount and vacuum
Control the time of suction.
In the whipping process, the amount of the pure water is 19 with the raw material otal investment ratio：1；In the baking
In dry step, the first product dries 7.5~8.5h in 120~125 DEG C of the baking oven, obtains finished product.
After adopting the above technical scheme, a kind of Multifunctional water purification filter core of the invention, with attapulgite, new filtering material and fibre
Dimension adhesive is made for raw material, and attapulgite and NACF are respectively provided with suction-operated, attapulgite and new drainage material
Material is respectively provided with ion-exchange capacity；Fiber binder contributes to shaping, prevents finished product from deforming shrink etc. in use.And can
The mechanical interception ability of finished product is improved, water treatment capacity is improved, compared with traditional filter core, the present invention has multifunctionality, no
Only there is suction-operated and mechanical interception ability, also hot with stronger ion exchange, adsorption capacity is big.
A kind of preparation method of Multifunctional water purification filter core of the present invention, by mixing, being molded and baking step, technique letter
It is single, the temperature that control is dried when drying so that the colloid of fiber binder can melt and not coking, still in fibre after shaping
Dimension shape, it is ensured that quality of finished.Compared with traditional technology, the present invention is bonded using the preparation method of wet type shaping by fiber
The filter core that agent is made, fiber binder is not easily blocked filter core micropore, the filter of such finished product also in threadiness in the filter core of finished product
Core remains filter core micropore, i.e., do not destroy micropore, not blocking microporous, can reduce the resistance being subject to during filter element filtering, and filtering is logical
Freely, and larger water-flowing amount can be formed, the service life of filter core can also be extended while with excellent hydrophilic.
Specific embodiment
In order to technical scheme is explained further, the present invention is explained in detail below by specific embodiment
State.In the present invention, attapulgite uses concave convex rod fibrous powder.
First, filter core makes
Embodiment one
A kind of new Multifunctional water purification filter core, is mainly prepared from by the raw material of following percentage by weight：
The attapulgite 30% of 100 mesh；
The NACF 20% of 100 mesh；
The ion-exchange fibre 25% of 100 mesh；
The fiber binder 25% of 100 mesh.
The preparation method of the Multifunctional water purification filter core, comprises the following steps：
(1) raw material prepares：Prepare attapulgite, the NACF of 100 mesh, the ion-exchange fibre of 100 mesh of 100 mesh
With the fiber binder of 100 mesh；
(2) mix：By the raw material in step (1) according to the above ratio, in input temporary storage tank, temporary storage tank is equiped with automatically
Agitating device, added with pure water in temporary storage tank, amount and the ratio of input raw material otal investment of pure water are 19:1, shape after stirring
Into the original slurry material of sticky shape；
(3) it is molded：By step 2) obtained by original slurry material the slurry tank of suction feeder is delivered to by pipe-line transportation system,
The filter core cylinder of annular shape is installed on the fixed station of suction feeder, the filter core cylinder offers micropore, is easy to original slurry material to exist
The filter core of cylindrical shape is adsorbed under vacuum action.In order to prevent original slurry material through micropore, coated on the lateral wall of filter core cylinder
There is layer of non-woven fabric, then, filter core base material is adsorbed on filter core cylinder up to certain thickness.The thickness can be carried out according to actual demand
Accommodation.Further, the filter core after suction is carried out into integer, and then is molded, obtain first product；It should be noted that this
In invention, filter core can be made into bar-shaped, block or sheet etc..Suction of the filter core of different shape and specification in suction feeder
Time is different, can carry out applicability adjustment according to actual conditions；
(4) dry：By step 3) obtained by first product be sent to baking oven, at a temperature of 115 DEG C, dry 8 hours, obtain into
Product, the i.e. new filtering element for treating water.
Embodiment two
A kind of new Multifunctional water purification filter core, is mainly prepared from by the raw material of following percentage by weight：
The attapulgite 25% of 300 mesh；
The NACF 20% of 300 mesh；
The ion-exchange fibre 40% of 300 mesh；
The fiber binder 15% of 300 mesh.
The preparation method of the Multifunctional water purification filter core, comprises the following steps：
(1) raw material prepares：Prepare attapulgite, the NACF of 300 mesh, the ion-exchange fibre of 300 mesh of 300 mesh
With the fiber binder of 300 mesh；
(2) mix：By the raw material in step (1) according to the above ratio, in input temporary storage tank, temporary storage tank is equiped with automatically
Agitating device, added with pure water in temporary storage tank, amount and the ratio of input raw material otal investment of pure water are 20:1, shape after stirring
Into the original slurry material of sticky shape；
(3) it is molded：By step 2) obtained by original slurry material the slurry tank of suction feeder is delivered to by pipe-line transportation system,
The filter core cylinder of annular shape is installed on the fixed station of suction feeder, the filter core cylinder offers micropore, is easy to original slurry material to exist
The filter core of cylindrical shape is adsorbed under vacuum action.In order to prevent original slurry material through micropore, coated on the lateral wall of filter core cylinder
There is layer of non-woven fabric, then, filter core base material is adsorbed on filter core cylinder up to certain thickness.The thickness can be carried out according to actual demand
Accommodation.Further, the filter core after suction is carried out into integer, and then is molded, obtain first product；It should be noted that this
In invention, filter core can be made into bar-shaped, block or sheet etc..Suction of the filter core of different shape and specification in suction feeder
Time is different, can carry out applicability adjustment according to actual conditions；
(4) dry：By step 3) obtained by first product be sent to baking oven, at a temperature of 115 DEG C, dry 8 hours, obtain into
Product, the i.e. new filtering element for treating water.
Embodiment three
A kind of new Multifunctional water purification filter core, is mainly prepared from by the raw material of following percentage by weight：
The attapulgite 15% of 250 mesh；
The NACF 15% of 250 mesh；
The montmorillonite 40% of 250 mesh；
The fiber binder 30% of 250 mesh.
The preparation method of the Multifunctional water purification filter core, comprises the following steps：
(1) raw material prepares：Prepare the attapulgite of 250 mesh, the NACF of 250 mesh, the fiber binder of 250 mesh and
The montmorillonite of 250 mesh；
(2) mix：By the raw material in step (1) according to the above ratio, in input temporary storage tank, temporary storage tank is equiped with automatically
Agitating device, added with pure water in temporary storage tank, amount and the ratio of input raw material otal investment of pure water are 18:1, shape after stirring
Into the original slurry material of sticky shape；
(3) it is molded：By step 2) obtained by original slurry material the slurry tank of suction feeder is delivered to by pipe-line transportation system,
The filter core cylinder of annular shape is installed on the fixed station of suction feeder, the filter core cylinder offers micropore, is easy to original slurry material to exist
The filter core of cylindrical shape is adsorbed under vacuum action.In order to prevent original slurry material through micropore, coated on the lateral wall of filter core cylinder
There is layer of non-woven fabric, then, filter core base material is adsorbed on filter core cylinder up to certain thickness.The thickness can be carried out according to actual demand
Accommodation.Further, the filter core after suction is carried out into integer, and then is molded, obtain first product；It should be noted that this
In invention, filter core can be made into bar-shaped, block or sheet etc..Suction of the filter core of different shape and specification in suction feeder
Time is different, can carry out applicability adjustment according to actual conditions；
(4) dry：By step 3) obtained by first product be sent to baking oven, at a temperature of 120 DEG C, dry 7.5 hours, obtain into
Product, the i.e. new filtering element for treating water.
Example IV
A kind of new Multifunctional water purification filter core, is mainly prepared from by the raw material of following percentage by weight：
The attapulgite 20% of 100 mesh；
The NACF 20% of 100 mesh；
The montmorillonite 45% of 100 mesh；
The fiber binder 15% of 100 mesh.
The preparation method of the Multifunctional water purification filter core, comprises the following steps：
(1) raw material prepares：Prepare the attapulgite of 100 mesh, the NACF of 100 mesh, the fiber binder of 100 mesh and
The montmorillonite of 100 mesh；
(2) mix：By the raw material in step (1) according to the above ratio, in input temporary storage tank, temporary storage tank is equiped with automatically
Agitating device, added with pure water in temporary storage tank, amount and the ratio of input raw material otal investment of pure water are 20:1, shape after stirring
Into the original slurry material of sticky shape；
(3) it is molded：By step 2) obtained by original slurry material the slurry tank of suction feeder is delivered to by pipe-line transportation system,
The filter core cylinder of annular shape is installed on the fixed station of suction feeder, the filter core cylinder offers micropore, is easy to original slurry material to exist
The filter core of cylindrical shape is adsorbed under vacuum action.In order to prevent original slurry material through micropore, coated on the lateral wall of filter core cylinder
There is layer of non-woven fabric, then, filter core base material is adsorbed on filter core cylinder up to certain thickness.The thickness can be carried out according to actual demand
Accommodation.Further, the filter core after suction is carried out into integer, and then is molded, obtain first product；It should be noted that this
In invention, filter core can be made into bar-shaped, block or sheet etc..Suction of the filter core of different shape and specification in suction feeder
Time is different, can carry out applicability adjustment according to actual conditions；
(4) dry：By step 3) obtained by first product be sent to baking oven, at a temperature of 120 DEG C, dry 8 hours, obtain into
Product, the i.e. new filtering element for treating water.
Embodiment five
The present embodiment and the percentage by weight that the difference of embodiment one is raw material.
In the present embodiment, a kind of new Multifunctional water purification filter core, mainly by the raw material preparation of following percentage by weight
Into：
The attapulgite 20% of 100 mesh；
The NACF 20% of 100 mesh；
The ion-exchange fibre 55% of 100 mesh；
The fiber binder 5% of 100 mesh.
Embodiment six
The present embodiment and the percentage by weight that the difference of embodiment three is raw material.
In the present embodiment, a kind of new Multifunctional water purification filter core, mainly by the raw material preparation of following percentage by weight
Into：
The attapulgite 20% of 250 mesh；
The NACF 20% of 250 mesh；
The montmorillonite 50% of 250 mesh；
The fiber binder 10% of 250 mesh.
Embodiment seven
The present embodiment and the percentage by weight that the difference of embodiment one is raw material, and the granularity of raw material are different.
In the present embodiment, a kind of new Multifunctional water purification filter core, mainly by the raw material preparation of following percentage by weight
Into：
The attapulgite 40% of 200 mesh；
The NACF 30% of 200 mesh；
The ion-exchange fibre 20% of 200 mesh；
The fiber binder 10% of 200 mesh.
Embodiment eight
The present embodiment is with the difference of any embodiment of one~embodiment of embodiment seven：The making of Multifunctional water purification filter core
Step (3) in method, in the present embodiment, step (3) shaping in by moulding machine by original slurry material cause spherical, column or
The first products such as grain shape.
It should be noted that 100 mesh~300 mesh attapulgites in the present invention can be commercially available gained, also can be by passing through
Purchase attapulgite carries out cutting and grinding and then reaches corresponding granular size requirement.The NACF of 100 mesh~300 mesh, from
Sub- exchange fiber and montmorillonite can be commercially available gained, also by buying montmorillonite can carry out cutting and grinding and then reach corresponding particle
Size requirements.In the present invention, fiber binder, and novel water filter material is commercially available gained, wherein, the fiber binder name of an article
It is BiPUL 50TWG, spinning Co., Ltd. by Japanese Japan provides.
2nd, performance test
By above-described embodiment one to the made filter core for obtaining of embodiment seven, Drinking Water is sampled at water-filling respectively
Reason test.Table 1 is that a kind of made Multifunctional water purification filter core for obtaining of embodiment seven carries out water process to the Drinking Water sampled
The test result report that filtering test is obtained, as a result shows：A kind of Multifunctional water purification filter core of the present invention has preferable energy of adsorption
Power, ion-exchange capacity and mechanical interception ability.
It should be noted that embodiment seven is preferred scheme of the invention, the filter in the present invention obtained by other embodiment
The corresponding test result of projects that core is tested meets technical requirements, and its test result is same or like with following table.
The test result of table 1 is reported
Above-described embodiment and non-limiting product form of the invention and style, the ordinary skill people of any art
Appropriate change or modification that member is done to it, all should be regarded as not departing from patent category of the invention.
Claims (8)
1. a kind of Multifunctional water purification filter core, it is characterised in that be mainly prepared from by the raw material of following percentage by weight：
The attapulgite 15%-45% of 100 mesh~300 mesh；
The NACF 15%~35% of 100 mesh~300 mesh；
The novel water filter material 15%~60% of 100 mesh~300 mesh；
The fiber binder 5%~40% of 100 mesh~300 mesh；
Wherein, the novel water filter material is ion-exchange fibre and/or montmorillonite.
2. a kind of Multifunctional water purification filter core according to claim 1, it is characterised in that main by following percentage by weight
Raw material is prepared from：
Attapulgite 20%-45% described in 100 mesh~300 purposes；
NACF 15%~35% described in 100 mesh~300 purposes；
Ion-exchange fibre 15%~25% described in 100 mesh~300 purposes；
Fiber binder 15%~35% described in 100 mesh~300 purposes.
3. a kind of Multifunctional water purification filter core according to claim 1, it is characterised in that main by following percentage by weight
Raw material is prepared from：
Attapulgite 15%-25% described in 100 mesh~300 purposes；
NACF 15%~25% described in 100 mesh~300 purposes；
Montmorillonite 35%~50% described in 100 mesh~300 purposes；
Fiber binder 15%~33% described in 100 mesh~300 purposes.
4. a kind of Multifunctional water purification filter core according to claim 1, it is characterised in that main by following percentage by weight
Raw material is prepared from：
The attapulgite 20%-30% of 100 mesh~300 mesh；
The NACF 20%~30% of 100 mesh~300 mesh；
The novel water filter material 20%~55% of 100 mesh~300 mesh；
The fiber binder 5%~15% of 100 mesh~300 mesh；
Wherein, the novel water filter material is the ion-exchange fibre and/or the montmorillonite.
5. a kind of Multifunctional water purification filter core according to any one of claim 1-4, it is characterised in that：The fiber glues
The mixture name of an article is BiPUL 50TWG, and spinning Co., Ltd. by Japanese Japan provides.
6. the preparation method of Multifunctional water purification filter core according to claim 1, it is characterised in that comprise the following steps：
(1) attapulgite of 100 mesh~300 mesh of preparation, the NACF of 100 mesh~300 mesh, 100 mesh~300 purposes are new
The fiber binder of filtering material, 100 mesh~300 mesh；
(2) stir：Raw material input temporary storage tank is carried out in mixing and stirring, temporary storage tank added with pure water, it is described pure
The amount of water is 15-22 with raw material otal investment ratio：1, the original slurry material of sticky shape is formed after stirring；
(3) it is molded：By step 2) obtained by original slurry material wet type shaped device be delivered to by pipe-line transportation system inhaled successively
Material and integer, and then be molded, obtain first product；Or, by step 2) obtained by original slurry material be delivered to by pipe-line transportation system and make
Type machine carries out forming processes, obtains first product；
(4) dry：By step 2) obtained by first product be sent to baking oven, at a temperature of 100~130 DEG C, dry 6~10 hours, obtain
To finished product.
7. the preparation method of Multifunctional water purification filter core according to claim 5, it is characterised in that：The wet type shaped device
Using suction feeder, during the suction, according to suction amount and the time of vacuum degree control suction.
8. the preparation method of Multifunctional water purification filter core according to claim 5, it is characterised in that：In the whipping process
In, the amount of the pure water is 19 with the raw material otal investment ratio：1；In the baking step, the first product is in 120
In~125 DEG C of the baking oven, 7.5~8.5h is dried, obtain finished product.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108424038A (en) * | 2018-05-21 | 2018-08-21 | 泉州万利得节能科技有限公司 | A kind of hollow nano active carbon rod and preparation method thereof |
| CN112933740A (en) * | 2021-02-07 | 2021-06-11 | 全硒时代(深圳)生物科技发展有限公司 | Method for oil purification decoloration selenium-rich sintered filter element |
| CN112933742A (en) * | 2021-03-02 | 2021-06-11 | 全硒时代(深圳)生物科技发展有限公司 | Method for manufacturing filter element with organic selenium |
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