Modification method of filter element raw material, modified filter element raw material, mineralized filter material, mineralized filter element and preparation method of mineralized filter element

Abstract

The invention belongs to the technical field of water treatment, particularly provides a modification method of a filter element raw material, a modified filter element raw material, a mineralized filter material, a mineralized filter element and a preparation method of the mineralized filter element, and aims to solve the problem that an existing filter element cannot meet the requirements of a human body on various minerals. Therefore, the modification method of the filter element raw material comprises thermal activation modification treatment and silicon-loaded strengthening treatment, and the thermal activation modification treatment specifically comprises the steps that the filter element raw material is calcined at a first set temperature for a first set time and then calcined at a second set temperature for a second set time, and after calcination, the filter element raw material is subjected to quenching water quenching; the silicon-loaded strengthening treatment specifically comprises the following steps: soaking the filter element raw material in a food-grade rice hull ash water suspension for a third set time, cleaning, drying and crushing to obtain the modified filter element raw material. The modified filter element raw material obtained through the modification method has the high silicon content, and when the modified filter element raw material is used as a mineralized filter material, a mineralized filter element prepared from the mineralized filter material can make filtered water have stable metasilicic acid.

Description

Technical Field

[0001] This application belongs to the technical field of water treatment, and specifically provides a method for modifying filter element raw materials, modified filter element raw materials, mineralized filter media, mineralized filter elements and their preparation methods. Background Art

[0002] In recent years, the shortage of water resources and serious water pollution have become important factors affecting social and economic development and people's living standards. To solve the above problems, various water treatment technologies have developed rapidly. Desalination technologies such as reverse osmosis, electrodialysis, distillation, and ion exchange resins have been rapidly applied in various industries and are widely used in household water treatment equipment such as water purifiers, entering thousands of households. Existing desalination technologies can already treat high-mineralization brackish water and various types of polluted sewage into pure water, greatly solving the safety problem of drinking water. However, with the large-scale popularization of pure water purifiers, the health problems of low-mineralization drinking water have become increasingly prominent. Usually, the pH of the water produced by the reverse osmosis membrane is weakly acidic and does not contain mineral elements beneficial to the human body, which is not conducive to human health.

[0003] To solve the above problems, water quality mineralization technology is used in the prior art to increase the mineral content in water. Currently, there are mainly three mineralization methods: the first is to add mineralization liquid to water, the second is to add mineral additives to water, and the third is to mix soluble calcium salts, magnesium salts, potassium salts, sodium salts and clay to granulate and prepare mineralization balls. Currently, mineralization balls are the main products on the market. However, their initial dissolution is uncontrollable, and the raw materials are chemically synthesized, posing health hazards. Especially under soaking conditions, the precipitation of various minerals is unstable, and it is impossible to provide truly healthy water. Moreover, the existing mineralization balls cannot stably precipitate metasilicic acid.

[0004] Correspondingly, a new technical solution is needed in this field to solve the above technical problems. Summary of the Invention

[0005] This application aims to solve the above technical problems, that is, to solve the problem that the existing filter elements cannot meet the human body's demand for various minerals and cannot provide metasilicic acid.

[0006] In a first aspect, this application provides a method for modifying filter element raw materials. The modification method includes sequentially performing thermal activation modification treatment and silicon loading strengthening treatment on the filter element raw materials. The thermal activation modification treatment specifically includes calcining the filter element raw materials at a first set temperature for a first set time, then calcining at a second set temperature for a second set time, and after calcination, performing rapid water quenching on the filter element raw materials. The second set temperature is higher than the first set temperature. The silicon loading strengthening treatment specifically includes soaking the filter element raw materials in a food-grade rice husk ash water suspension for a third set time, then washing, drying and pulverizing to obtain the modified filter element raw materials.

[0007] In the preferred technical solution of the above-mentioned modification method of filter element raw materials, the first set temperature is 350°C to 400°C; and / or, the first set time is 1.5 h to 2.5 h; and / or, the second set temperature is 600°C to 750°C; and / or, the second set time is 1 h to 3 h; and / or, the rapid water quenching specifically means pouring the hot filter element raw materials into deionized water at 20°C to 25°C for cleaning to rapidly cool the high-temperature filter element raw materials after calcination; and / or, the third set time is 20 h to 28 h; and / or, the solid-liquid mass ratio of the filter element raw materials to the food-grade rice husk ash water suspension is 1:(3 to 6); and / or, the concentration of the food-grade rice husk ash water suspension is 30 to 50 g / L; and / or, the temperature of the food-grade rice husk ash water suspension is 85°C to 95°C, preferably the temperature of the food-grade rice husk ash water suspension is 90°C.

[0008] In the preferred technical solution of the above-mentioned modification method of filter element raw materials, the filter element raw materials are pretreated before the thermal activation modification treatment, and the pretreatment sequentially includes screening treatment, electromagnetic iron removal treatment, ultrasonic treatment, and gradient water washing treatment; wherein, the screening treatment specifically means crushing the filter element raw materials and putting them into a vibrating screen to screen out particles larger than 5 cm, then identifying and removing colored minerals through a color sorter, and then separating quartz using a heavy liquid with a specific gravity of 2.6 g / cm 3 The gradient water washing treatment specifically means that at 55°C to 65°C, the filter element raw materials are reversely washed for 15 min to 25 min respectively under the first water pressure, the second water pressure, and the third water pressure, and then dried and crushed to 35 to 200 mesh, and the first water pressure, the second water pressure, and the third water pressure increase in sequence.

[0009] In the preferred technical solution of the above-mentioned modification method of filter element raw materials, the first water pressure is 0.2 MPa; and / or, the second water pressure is 0.5 MPa; and / or, the third water pressure is 0.8 MPa.

[0010] In the case of adopting the above technical solution, the modification method of the filter element raw material of the present application performs thermal activation modification treatment and silicon loading strengthening treatment on the filter element raw material. Among them, the first-stage calcination in the thermal activation modification treatment can effectively remove organic impurities in the filter element raw material, and the second-stage calcination can open the microporous structure, reconstruct the silicon oxygen tetrahedral structure, form nanoscale microcracks by using thermal stress, and increase the surface area of the filter element raw material; rapid water quenching can ultra-fast cool to fix the metastable silicon oxygen tetrahedral network formed by calcination, inhibit the generation of low-activity crystal phases such as cristobalite / tridymite, solidify silicon active sites and form nanoscale silicon hydroxyl groups, which helps to improve the ability of mineral dissolution in the later stage; in addition, the silicon loading strengthening treatment can further increase the silicon content in the filter element raw material, thereby increasing the total silicon loading amount in the filter element raw material; in addition, the modified filter element raw material prepared by using this modification method can stably precipitate metasilicic acid. The mineralized filter element prepared from the modified filter element raw material has no chemical addition, can simulate the formation process of natural mineral water, provide water rich in minerals of metasilicic acid, and provide safe and healthy water for users.

[0011] Further, control the first set temperature to 350-400 °C and the first set time to 1.5-2.5 h. Calcining at this temperature for a sufficient long time can effectively remove the organic impurities in the filter element raw material.

[0012] Still further, control the second set temperature to 600-750 °C and the second set time to 1-3 h. Calcining at this temperature for a sufficient long time can effectively increase the surface area of the filter element raw material, creating favorable conditions for the subsequent formation of nanoscale silicon hydroxyl groups.

[0013] Still further, control the temperature of the food-grade rice husk ash water suspension to 85-95 °C and the third set time to 20-28 h. Soaking at this temperature for a sufficient long time can generate a nano-hydroxyapatite composite structure on the filter element raw material, thereby effectively increasing the silicon loading amount of the filter element raw material.

[0014] Still further, control the solid-liquid mass ratio of the filter element raw material to the food-grade rice husk ash water suspension to 1:(3-6), which can increase the silicon loading amount of the modified filter element raw material to a greater extent.

[0015] Still further, control the concentration of the food-grade rice husk ash water suspension to 30-50 g / L, which can increase the silicon loading amount of the modified filter element raw material to a greater extent.

[0016] Still further, before the thermal activation modification treatment, pre-treat the filter element raw material first, which can effectively remove impurities such as heavy metals and pollutants carried in the filter element raw material, thereby effectively ensuring the safety of the filter element raw material.

[0017] In a second aspect, the present application provides a modified filter element raw material, which is obtained by modifying a natural filter element raw material through the above-mentioned modification method of the filter element raw material.

[0018] In a preferred technical solution of the above-mentioned modified filter element raw material, the modified filter element raw material includes one or more of modified medical stone, modified diatomite, modified zeolite, and modified opal.

[0019] In a third aspect, the present application provides a mineralized filter material, which includes modified opal, modified medical stone, and modified zeolite. Among them, the mass ratio of the modified opal, the modified medical stone, and the modified zeolite is modified opal: modified medical stone: modified zeolite = (1-3):(1-3):(1-4); among them, the modified opal is obtained by modifying natural opal as a filter element raw material through the above-mentioned modification method of the filter element raw material; the modified medical stone is obtained by modifying natural medical stone as a filter element raw material through the above-mentioned modification method of the filter element raw material; the modified zeolite is obtained by modifying natural zeolite as a filter element raw material through the above-mentioned modification method of the filter element raw material.

[0020] In a preferred technical solution of the above-mentioned mineralized filter material, the mass ratio of the modified opal, the modified medical stone, and the modified zeolite is modified opal: modified medical stone: modified zeolite = 1:1:1.

[0021] In the case of adopting the above technical solution, the mineralized filter material of the present application includes modified opal, modified medical stone, and modified zeolite. By controlling the mass ratio of the modified opal, the modified medical stone, and the modified zeolite to be (1-3):(1-3):(1-4), the content of silicon in the mineralized filter material is regulated, and further the release concentration and release rate of metasilicic acid of the mineralized filter element prepared from the mineralized filter material are controlled. In addition, the mineralized filter material of the present application is obtained by mixing natural ores after modification, without adding chemical substances, and is safe and hygienic.

[0022] In a fourth aspect, the present application provides a mineralized filter element, which includes the following components by weight: 20-40 parts of mineralized filter material, 60-150 parts of adsorbent, and 30-40 parts of binder; among them, the mineralized filter material is the above-mentioned mineralized filter material, and the adsorbent includes at least activated carbon.

[0023] In a preferred technical solution of the above-mentioned mineralized filter element, the mineralized filter element includes the following components by weight: 30-40 parts of mineralized filter material, 80-120 parts of adsorbent, and 30-40 parts of binder.

[0024] In the preferred technical solution of the above mineralized filter element, the adsorbent includes activated carbon and modified diatomaceous earth. Among them, the mass ratio of the activated carbon to the modified diatomaceous earth is (60-110):(15-40), and the modified diatomaceous earth is prepared by modifying natural diatomaceous earth as the filter element raw material through the above-mentioned modification method of the filter element raw material; and / or, the binder includes one or more of food-grade polyethylene, food-grade polyvinyl chloride, food-grade polyvinyl alcohol, cellulose, and polylactic acid.

[0025] In a fifth aspect, the present application provides a method for preparing a mineralized filter element, and the preparation method includes: (1) uniformly mixing a mineralized filter material, an adsorbent, and a binder to obtain a mixed material; (2) putting the mixed material into a filter element mold and sintering it at 180-200 °C and 14-18 MPa for 60-120 minutes to obtain the mineralized filter element.

[0026] In the case of adopting the above technical solution, the mineralized filter element of the present application uses a mineralized filter material, an adsorbent, and a binder as raw materials. Among them, the weight parts of the mineralized filter material are controlled to be 20-40 parts, the weight parts of the adsorbent are 60-150 parts, and the weight parts of the binder are 30-40 parts; under the combined action of the above raw materials, the water filtered by the mineralized filter element can contain rich metasilicic acid minerals, and the mineralized filter element can ensure the stable release of metasilicic acid, effectively improving the service life of the mineralized filter element. In addition, the mineralized filter elements of the present application are all natural raw materials, no chemical substances are added during the modification and preparation processes, and heavy metals in the ore are effectively removed, which is safe and hygienic. In addition, the release of metasilicic acid is stable and the service life is long.

[0027] Further, the adsorbent includes activated carbon and modified diatomaceous earth. Among them, the mass ratio of the activated carbon to the modified diatomaceous earth is (60-110):(15-40). Replacing part of the activated carbon with modified diatomaceous earth not only ensures the adsorption capacity but also further ensures the stable metasilicic acid substance in the filtered water, thereby improving the water quality and further increasing the service life of the mineralized filter element for releasing metasilicic acid. Description of the Drawings

[0028] The following describes the preferred embodiments of the present application with reference to the drawings. In the drawings:

[0029] Figure 1 is a flowchart of the main steps of the modification method of the filter element raw material of the present application;

[0030] Figure 2 is a flowchart of the specific implementation of the modification method of the filter element raw material of the present application. Detailed Description of the Invention

[0031] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the protection scope of the present application.

[0032] It should be noted that in the description of the present application, terms indicating directions or positional relationships such as "above", "inside", "outside", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0033] In addition, it should also be noted that in the description of the present application, unless otherwise clearly specified and limited, the terms "set" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through other components. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0034] Based on the problems pointed out in the background art that the existing filter elements cannot meet the human body's demand for various minerals and cannot provide metasilicic acid.

[0035] The present application provides a method for modifying a filter element raw material. By performing thermal activation modification treatment and silicon loading strengthening treatment on natural ore, the silicon loading amount in the natural ore can be increased, the effect of silicon dissolution can be improved, and there is no chemical addition. Thus, it can be used as a mineralized filter material that can provide metasilicic acid to prepare a mineralized filter element, so that the filtered water has stable metasilicic acid when the prepared mineralized filter element is used.

[0036] Specifically, please refer to Figure 1 , the present application provides a method for modifying a filter element raw material in the first aspect, including the following steps:

[0037] S2: Perform thermal activation modification treatment on the filter element raw material: Calcinate the filter element raw material at a first set temperature for a first set time, and then calcinate it at a second set temperature for a second set time. After calcination, perform rapid water quenching on the filter element raw material. Among them, the second set temperature is higher than the first set temperature.

[0038] S3: Perform silicon loading strengthening treatment on the filter element raw material: Immerse the filter element raw material in a food-grade rice husk ash water suspension for a third set time, and then wash, dry and crush it to obtain the modified filter element raw material.

[0039] The modification method of the filter element raw material of the present application performs thermal activation modification treatment and silicon loading strengthening treatment on the filter element raw material. Among them, the first-stage calcination in the thermal activation modification treatment can effectively remove organic impurities in the filter element raw material, and the second-stage calcination can open the microporous structure, reconstruct the silicon oxygen tetrahedral structure, form nanoscale microcracks by using thermal stress, and increase the surface area of the filter element raw material; rapid water quenching can ultra-fast cool to fix the metastable silicon oxygen tetrahedral network formed by calcination, inhibit the generation of low-activity crystal phases such as cristobalite / tridymite, solidify silicon active sites and form nanoscale silicon hydroxyl groups, which helps to improve the ability of later mineral dissolution; in addition, the silicon loading strengthening treatment can further increase the silicon content in the filter element raw material, thereby increasing the total silicon loading amount in the filter element raw material; in addition, the modified filter element raw material prepared by using this modification method can stably precipitate metasilicic acid, and there is no chemical addition when preparing a mineralized filter element with the modified filter element raw material, which can simulate the formation process of natural mineral water, provide water rich in minerals of metasilicic acid, and provide safe and healthy water for users.

[0040] Preferably, in step S2, the first set temperature is 350°C to 400°C.

[0041] Specifically, the first set temperature can specifically be 350°C, 360°C, 370°C, 380°C, 390°C, 400°C or a value between any two of the above values.

[0042] Controlling the first set temperature at 350°C to 400°C can effectively remove organic impurities in the filter element raw material.

[0043] Preferably, in step S2, the first set time is 1.5 h to 2.5 h.

[0044] Specifically, the first set time can specifically be 1.5 h, 2 h, 2.5 h or a value between any two of the above values.

[0045] Controlling the first set time between 1.5 h and 2.5 h ensures sufficient calcination time, thereby ensuring the effect of removing organic impurities.

[0046] Preferably, in step S2, the second set temperature is 600°C to 750°C.

[0047] Specifically, the second set temperature can specifically be 600°C, 610°C, 620°C, 630°C, 640°C, 650°C, 660°C, 670°C, 680°C, 690°C, 700°C, 710°C, 720°C, 730°C, 740°C, 750°C or a value between any two of the above values.

[0048] Control the second set temperature at 600°C to 750°C. During the calcination process, the silicon oxygen tetrahedron structure can be reconstructed, effectively increasing the surface area of the filter element raw material and creating favorable conditions for the subsequent formation of nanoscale silicon hydroxyl groups.

[0049] Preferably, in step S2, the second set time is 1 h to 3 h.

[0050] Specifically, the second set time can be 1 h, 1.5 h, 2 h, 2.5 h, 3 h, or a value between any two of the above values.

[0051] Control the second set time between 1 h and 3 h to ensure sufficient calcination time, which can effectively increase the surface area of the filter element raw material.

[0052] Preferably, in step S2, the rapid water quenching is specifically to pour the hot filter element raw material into deionized water at 20°C to 25°C for cleaning to rapidly cool the high-temperature filter element raw material after calcination.

[0053] Rapid water quenching can solidify the silicon active sites and form nanoscale silicon hydroxyl groups. Controlling the temperature of the deionized water at 20 to 25°C can increase the proportion of silicon hydroxyl groups on the filter element raw material, thereby helping to increase the silicon loading amount during the silicon-supported strengthening treatment.

[0054] Preferably, in step S2, the third set time is 20 h to 28 h.

[0055] Specifically, the third set time can be 20 h, 21 h, 22 h, 23 h, 24 h, 25 h, 26 h, 27 h, 28 h, or a value between any two of the above values.

[0056] Preferably, in step S2, the solid-liquid mass ratio of the filter element raw material to the food-grade rice husk ash water suspension is 1:(3 to 6).

[0057] Specifically, the solid-liquid mass ratio of the filter element raw material to the food-grade rice husk ash water suspension can be 1:3, 1:3.5, 1:4, 1:4.5, 1:5, 1:5.5, 1:6, and a value between any two of the above values.

[0058] Preferably, in step S2, the concentration of the food-grade rice husk ash water suspension is 30 to 50 g / L.

[0059] Specifically, the concentration of the food-grade rice husk ash water suspension can be 30 g / L, 35 g / L, 40 g / L, 45 g / L, 50 g / L, or a value between any two of the above values.

[0060] Preferably, in step S2, the temperature of the food-grade rice husk ash water suspension is 85°C to 95°C, and more preferably the temperature of the food-grade rice husk ash water suspension is 90°C.

[0061] Specifically, the temperature of the food-grade rice husk ash aqueous suspension can be 85°C, 86°C, 87°C, 88°C, 89°C, 90°C, 91°C, 92°C, 93°C, 94°C, 95°C or a value between any two of the above values.

[0062] Preferably, refer to Figure 2 , and before the filter element raw material is subjected to thermal activation modification treatment, step S1 is first performed: pretreating the filter element raw material.

[0063] Among them, step S1 specifically includes step S11, step S2, step S13, step S14, and step S15.

[0064] S11: Screen the filter element raw material: After crushing the filter element raw material, put it into a vibrating screen, screen out particles larger than 5 cm, then identify and remove abnormal-colored minerals through a color sorter, and then use a heavy liquid with a specific gravity of 2.6 g / cm 3 to separate quartz.

[0065] S12: Perform electromagnetic iron removal treatment on the filter element raw material: Use an electromagnet to remove iron impurities in the filter element raw material.

[0066] S13: Perform ultrasonic treatment on the filter element raw material: The filter element raw material is subjected to ultrasonic treatment for 20 min, the ultrasonic solvent is deionized water, and the ultrasonic amplitude is 40 - 60 kHz. Ultrasonic treatment is used to peel off the pollutants attached to the surface of the filter element raw material.

[0067] S14: Perform gradient water washing treatment on the filter element raw material: At 55°C - 65°C, the filter element raw material is successively counter-currently washed for 15 min - 25 min under the first water pressure, the second water pressure, and the third water pressure, and then dried and crushed to 35 - 200 mesh. The first water pressure, the second water pressure, and the third water pressure increase in sequence. By gradually increasing the water pressure for gradient water washing and ensuring the water temperature is between 55°C and 65°C, the microcracks on the surface of the minerals in the filter element raw material can be enlarged, releasing the adsorbed heavy metals inside. The high-pressure water can impact the mineral cross-section, releasing the encapsulated heavy metal particles, and can effectively remove the heavy metal impurities carried in the filter element raw material, ensuring the safety of the filter element raw material.

[0068] Preferably, the first water pressure is 0.2 MPa.

[0069] Preferably, the second water pressure is 0.5 MPa.

[0070] Preferably, the third water pressure is 0.8 MPa.

[0071] Preferably, the water is deionized water.

[0072] Before the thermal activation modification treatment, the filter element raw material is pretreated first, which can effectively remove impurities such as heavy metals and pollutants carried in the filter element raw material, thus effectively ensuring the safety of the filter element raw material.

[0073] In a second aspect, the present application provides a modified filter element raw material, which is obtained by modifying a natural filter element raw material through the modification method of the filter element raw material provided in the first aspect.

[0074] Preferably, the modified filter element raw material includes one or more of modified medical stone, modified diatomite, modified zeolite, and modified opal.

[0075] Specifically, the modified medical stone is obtained by modifying medical stone through the above modification method, the modified diatomite is obtained by modifying diatomite through the above modification method, the modified zeolite is obtained by modifying zeolite through the above modification method, and the modified opal is obtained by modifying opal through the above modification method.

[0076] The modification method of the filter element raw material in the present application is applicable to the modification treatment of various different natural ores, such as natural ores like opal, medical stone, zeolite, diatomite, etc., to increase the silicon loading amount of the filter element raw material.

[0077] The following describes in detail the modification method of the filter element raw material in the present application through several specific examples.

[0078] Example 1

[0079] The filter element raw material in this example is natural opal, and the modified filter element raw material in this example is modified opal.

[0080] The modified opal in this example is obtained by modification through the following steps:

[0081] (1) Screening treatment: After crushing the natural opal, it is put into a vibrating screen, particles larger than 5 cm are screened out, and then different-colored minerals are identified and removed by a color sorter. Then, quartz is separated using a heavy liquid with a specific gravity of 2.6 g / cm 3 ³.

[0082] (2) Electromagnetic iron removal treatment: Use an electromagnet to remove iron impurities in the natural opal.

[0083] (3) Ultrasonic treatment: The natural opal is ultrasonically treated for 20 min. The ultrasonic solvent is deionized water, and the ultrasonic amplitude is 50 kHz. The ultrasonic treatment is used to strip off the pollutants attached to the surface of the natural opal.

[0084] (4) Gradient water washing treatment: At 60 °C, the natural opal obtained in step (3) is countercurrently washed at 0.2 MPa, 0.5 MPa, and 0.8 MPa for 15 min to 25 min respectively, and then dried and crushed to 100 mesh.

[0085] (5) Thermal activation modification treatment: The opal obtained in step (4) is calcined at the first set temperature (400 °C) for the first set time (2.5 h), and then calcined at the second set temperature (750 °C) for the second set time (2 h). After calcination, it is soaked and washed with water at 25 °C.

[0086] (6) Silicon loading strengthening treatment: The opal obtained in step (5) is soaked in a food-grade rice husk ash water suspension for the third set time (28 h), and then washed, dried, and pulverized to obtain the modified opal, and then crushed to 100 mesh for standby. Among them, the concentration of the food-grade rice husk ash water suspension is 50 g / L, the temperature of the food-grade rice husk ash water suspension is 90 °C, and the mass ratio of opal to food-grade rice husk ash water suspension = 1:6.

[0087] Example 2

[0088] The filter element raw material of this embodiment is natural iolite, and the modified filter element raw material of this embodiment is modified iolite.

[0089] The modified iolite of this embodiment is prepared by modification through the following steps:

[0090] (1) Screening treatment: After crushing the natural iolite, it is put into a vibrating screen to screen out particles larger than 5 cm, and then the colored minerals are identified and removed by a color sorter, and then the quartz is separated using a heavy liquid with a specific gravity of 2.6 g / cm 3 ³.

[0091] (2) Electromagnetic iron removal treatment: Use an electromagnet to remove iron impurities in the natural iolite.

[0092] (3) Ultrasonic treatment: The natural iolite is ultrasonically treated for 20 min, the ultrasonic solvent is deionized water, and the ultrasonic amplitude is 50 kHz. The ultrasonic treatment is used to strip the pollutants attached to the surface of the natural iolite.

[0093] (4) Gradient water washing treatment: At 60 °C, the natural iolite obtained in step (3) is countercurrently washed at 0.2 MPa, 0.5 MPa, and 0.8 MPa for 15 min to 25 min respectively, and then dried and crushed to 100 mesh.

[0094] (5) Thermal activation modification treatment: The medaka stone obtained in step (4) is calcined at the first set temperature (400 °C) for the first set time (2.5 h), and then calcined at the second set temperature (750 °C) for the second set time (h). After calcination, it is soaked and washed with water at 25 °C.

[0095] (6) Silicon-supported strengthening treatment: The medaka stone obtained in step (5) is soaked in a food-grade rice husk ash water suspension for the third set time (28 h), and then washed, dried and crushed to obtain the modified medaka stone, which is then crushed to 100 meshes for standby. Among them, the concentration of the food-grade rice husk ash water suspension is 50 g / L, the temperature of the food-grade rice husk ash water suspension is 90 °C, and the mass ratio of medaka stone to food-grade rice husk ash water suspension is 1:6.

[0096] Example 3

[0097] The filter element raw material of this embodiment is natural zeolite, and the modified filter element raw material of this embodiment is modified zeolite.

[0098] The modified zeolite of this embodiment is prepared by modification through the following steps:

[0099] (1) Screening treatment: After crushing the natural zeolite, it is put into a vibrating screen to screen out particles larger than 5 cm, and then the colored minerals are identified and removed by a color sorter. Then, the quartz is separated using a heavy liquid with a specific gravity of 2.6 g / cm 3 3.

[0100] (2) Electromagnetic iron removal treatment: Use an electromagnet to remove iron impurities in the natural zeolite.

[0101] (3) Ultrasonic treatment: The natural zeolite is ultrasonically treated for 20 min. The ultrasonic solvent is deionized water, and the ultrasonic amplitude is 50 kHz. Ultrasonic treatment is used to strip the pollutants attached to the surface of the natural zeolite.

[0102] (4) Gradient water washing treatment: At 60 °C, the natural zeolite obtained in step (3) is countercurrently washed at 0.2 MPa, 0.5 MPa and 0.8 MPa for 15 min to 25 min respectively, and then dried and crushed to 100 meshes.

[0103] (5) Thermal activation modification treatment: The zeolite obtained in step (4) is calcined at the first set temperature (400 °C) for the first set time (2.5 h), and then calcined at the second set temperature (750 °C) for the second set time (h). After calcination, it is soaked and washed with water at 25 °C.

[0104] (6) Silicon-supported strengthening treatment: Soak the zeolite obtained in step (5) in a food-grade rice husk ash aqueous suspension for a third set time (28 h), then wash, dry, and crush it to obtain modified zeolite, and then crush it to 100 mesh for standby. Among them, the concentration of the food-grade rice husk ash aqueous suspension is 50 g / L, the temperature of the food-grade rice husk ash aqueous suspension is 90 °C, and the ratio of zeolite to food-grade rice husk ash aqueous suspension (mass ratio) = 1:6.

[0105] Example 4

[0106] The filter element raw material of this embodiment is natural diatomite, and the modified filter element raw material of this embodiment is modified diatomite.

[0107] The modified diatomite of this embodiment is prepared by the following steps:

[0108] (1) Screening treatment: After crushing the natural diatomite, put it into a vibrating screen, screen out particles larger than 5 cm, then identify and remove the discolored minerals through a color sorter, and then use a heavy liquid with a specific gravity of 2.6 g / cm 3 to separate quartz.

[0109] (2) Electromagnetic iron removal treatment: Use an electromagnet to remove iron impurities in the natural diatomite.

[0110] (3) Ultrasonic treatment: Ultrasonically treat the natural diatomite for 20 min, the ultrasonic solvent is deionized water, and the ultrasonic amplitude is 50 kHz. Ultrasonic treatment is used to strip the pollutants attached to the surface of the natural diatomite.

[0111] (4) Gradient water washing treatment: At 60 °C, the natural diatomite obtained in step (3) is countercurrently washed at 0.2 MPa, 0.5 MPa, and 0.8 MPa for 15 min to 25 min respectively, and then dried and crushed to 100 mesh.

[0112] (5) Thermal activation modification treatment: Calcinate the diatomite obtained in step (4) at a first set temperature (400 °C) for a first set time (2.5 h), then calcinate it at a second set temperature (750 °C) for a second set time (h), and after calcination, soak and wash it with water at 25 °C.

[0113] (6) Silicon-supported strengthening treatment: Soak the diatomite obtained in step (5) in a food-grade rice husk ash aqueous suspension for a third set time (28 h), then wash, dry, and crush it to obtain modified diatomite, and then crush it to 100 mesh for standby. Among them, the concentration of the food-grade rice husk ash aqueous suspension is 50 g / L, the temperature of the food-grade rice husk ash aqueous suspension is 90 °C, and the ratio of diatomite to food-grade rice husk ash aqueous suspension (mass ratio) = 1:6.

[0114] Example 5

[0115] The filter element raw material of this embodiment is natural opal, and the modified filter element raw material of this embodiment is modified opal.

[0116] The modification method of the modified opal in this embodiment is the same as that in Embodiment 1. The difference between it and Embodiment 1 is only that the screening treatment in step (1), the electromagnetic iron removal treatment in step (2), the ultrasonic treatment in step (3), and the gradient water washing treatment in step (4) are not set. After directly crushing the natural opal to 100 mesh, step (5) heat activation modification treatment and step (6) silicon loading strengthening treatment are carried out.

[0117] Comparative Example 1

[0118] The filter element raw material of this comparative example is the same batch of natural opal as that in Embodiment 1.

[0119] Comparative Example 2

[0120] The filter element raw material of this comparative example is the same batch of natural picrolite as that in Embodiment 2.

[0121] Comparative Example 3

[0122] The filter element raw material of this comparative example is the same batch of natural zeolite as that in Embodiment 3.

[0123] Comparative Example 4

[0124] The filter element raw material of this comparative example is the same batch of natural diatomite as that in Embodiment 4.

[0125] Comparative Example 5

[0126] The filter element raw material of this comparative example is the same batch of natural opal as that in Embodiment 1, and this natural opal is the natural opal after pretreatment such as the screening treatment in step (1), the electromagnetic iron removal treatment in step (2), the ultrasonic treatment in step (3), and the gradient water washing treatment in step (4) of Embodiment 1.

[0127] Test Example 1

[0128] The modified filter element raw materials of the above Embodiments 1 to 5 and the filter element raw materials of Comparative Examples 1 to 5 are detected, and the silicon content (the mass percentage of the silicon-containing component relative to the total filter element raw material, where the silicon-containing component is not limited to SiO2) and the dissolved heavy metal content are detected. The detection results are shown in Table 1.

[0129] Specifically, the test method for the heavy metal content is: closed microwave digestion-ICP-MS (inductively coupled plasma mass spectrometry) method-GBT5750.6-2006; the test method for the silicon content is: XRF (X-ray fluorescence)-GBT31391.

[0130] Table 1 Detection data table of Examples 1 - 5 and Comparative Examples 1 - 5

[0131] It can be seen from the experimental data in Table 1 that:

[0132] 1. Comparing Example 1 with Comparative Example 1, Example 2 with Comparative Example 2, Example 3 with Comparative Example 3, and Example 4 with Comparative Example 4, the heavy metal content of the examples is greatly reduced compared to the comparative examples, and the silicon content is increased. Thus, it can be known that the modification method of the filter element raw material of the present application can effectively remove harmful substances in the filter element raw material and simultaneously increase the silicon loading of the filter element raw material.

[0133] 2. Comparing Example 1 with Example 5, Comparative Example 1 and Comparative Example 5, the heavy metal content of Example 5 is reduced compared to Comparative Example 1, but it is still higher compared to Example 1 and Comparative Example 5. For Comparative Example 5 compared to Comparative Example 1, the heavy metal content is reduced and the reduction amplitude is much greater than that of Example 5. Its silicon content is increased compared to Comparative Example 1, and the increase amplitude is lower than that of Example 5. Thus, it can be known that pretreating the filter element raw material before the thermal activation modification treatment can effectively remove heavy metals in the filter element raw material, thereby improving the safety of the filter element raw material, and it is also of great significance for increasing the silicon loading.

[0134] Test Example 2

[0135] This test example investigated the effects of thermal activation modification treatment parameters and silicon loading strengthening treatment parameters on the silicon content of the prepared modified filter element raw material.

[0136] 1. The first set temperature and the first set time in thermal activation modification

[0137] The natural opal was modified according to the modification method of Example 1 to prepare modified opal, except that the first set temperature and / or the first set time in step (5) were changed, and the effects of the first set temperature and the first set time on the silicon content in the modified opal were investigated.

[0138] The results are shown in Table 2:

[0139] Table 2 Effects of the first set time and the first set temperature on the silicon content of the modified opal The first set temperature The first set time Silicon content (%) 400℃ 2.5h 95.8％ 250℃ 2.5h 92.6％ 350℃ 2.5h 93.4％ 450℃ 2.5h 95.2％ 400℃ 1h 93.6％ 400℃ 1.5h 94.7％ 400℃ 3h 95.7％

[0140] It can be seen from the data in Table 2 that:

[0141] When the first set time remains unchanged, as the first set temperature increases, its silicon content increases. However, when the first set temperature is higher than 400 °C, the silicon content decreases instead. And when the first set temperature is lower than 350 °C, its silicon content decreases significantly. Therefore, it is preferred that the first set temperature be 350 °C to 400 °C.

[0142] When the first set temperature remains unchanged, as the first set time extends, its silicon content gradually increases. But when the first set time is longer than 2.5 h, its silicon content hardly increases anymore. Therefore, it is preferred that the first set time be 1.5 h to 2.5 h to save time and ensure the silicon content of the final product.

[0143] In summary, in the thermal activation modification treatment, setting the first set temperature to 350 - 400 °C and the first set time to 1.5 - 2.5 h can effectively ensure the silicon loading of the modified filter element raw material.

[0144] 2. The second set temperature and the second set time in thermal activation modification

[0145] The natural opal is modified according to the modification method of Example 1 to prepare the modified opal, except that the second set temperature and / or the second set time in step (5) are changed, and the effects of the second set temperature and the second set time on the silicon content in the modified opal are investigated.

[0146] The results are shown in Table 3:

[0147] Table 3 Effects of the second set time and the second set temperature on the silicon content of the modified opal The second set temperature The second set time Silicon content (%) 750℃ 2h 95.8％ 500℃ 2h 91.2％ 600℃ 2h 91.8％ 800℃ 2h 95.3％ 750℃ 1h 94.9％ 750℃ 3h 95.8％ 750℃ 4h 95.5％

[0148] From the data in Table 3, it can be seen that:

[0149] When the second set time remains unchanged, as the second set temperature increases, its silicon content increases. However, when the second set temperature is higher than 750 °C, the silicon content decreases instead. And when the second set temperature is lower than 600 °C, its silicon content decreases. Therefore, it is preferred that the first set temperature be 600 °C to 750 °C, and most preferably the first set temperature be 750 °C.

[0150] When the second set temperature remains unchanged, as the second set time extends, its silicon content gradually increases. But when the second set time is longer than 3 h, its silicon content hardly increases anymore. Therefore, it is preferred that the second set time be 1 h to 3 h to save time and ensure the silicon content of the final product.

[0151] In summary, in the thermal activation modification treatment, setting the second set temperature to 600 - 750 °C and the second set time to 1 - 3 h can effectively ensure the silicon loading of the modified filter element raw material.

[0152] 3. Quenching with rapid cooling water in thermal activation modification

[0153] The natural opal was modified according to the modification method of Example 1 to prepare a modified opal, except that the rapid water quenching in step (5) was changed, and the effect of rapid water quenching on the silicon content in the modified opal was investigated.

[0154] The results are shown in Table 4:

[0155] Table 4 Effect of rapid water quenching on the silicon content of modified opal

[0156] It can be seen from the experimental data in Table 4 that:

[0157] When the calcined filter element raw material is naturally cooled without rapid water quenching, its final silicon content will be significantly reduced. Thus, it can be known that during the thermal activation modification process, rapid cooling of the hot filter element raw material with deionized water at a lower temperature after calcination can effectively increase the silicon content of the filter element raw material; in addition, the temperature of the deionized water during the rapid water quenching process will also affect the silicon content of the finally modified filter element raw material. It is preferred that the temperature of the deionized water is 20 - 25 °C. Too high a temperature is not conducive to the rapid cooling of the filter element raw material, thus affecting the proportion of silicon hydroxyl groups on its surface, and further affecting the silicon loading amount of the modified filter element raw material.

[0158] 4. Concentration of food-grade rice husk ash aqueous suspension in silicon-supported strengthening treatment

[0159] The natural opal was modified according to the modification method of Example 1 to prepare a modified opal, except that the concentration of the food-grade rice husk ash water suspension in step (6) was changed, and the effect of the concentration of the food-grade rice husk ash water suspension on the silicon content in the modified opal was investigated.

[0160] The results are shown in Table 5:

[0161] Table 5 Effect of the concentration of food-grade rice husk ash water suspension on the silicon content of modified opal Concentration of rice husk ash aqueous suspension (g / L) Silicon content (%) 50 g / L 95.8％ 20 g / L 94.7％ 30 g / L 94.9％ 40 g / L 95.3％ 60 g / L 95.5％

[0162] It can be seen from the data in Table 5 that:

[0163] As the concentration of the rice husk ash water suspension increases, the silicon content of the modified filter element raw material also increases. Therefore, it is preferred to control the concentration of the food-grade rice husk ash water suspension to be 30 - 50 g / L.

[0164] 5. Solid-liquid of filter element raw material and food-grade rice husk ash aqueous suspension in silicon-supported strengthening treatment Mass ratio

[0165] The natural opal was modified according to the modification method of Example 1 to prepare a modified opal, except that the solid-liquid mass ratio of the filter element raw material to the food-grade rice husk ash aqueous suspension in step (6) was changed, and the effect of the solid-liquid mass ratio of the filter element raw material to the food-grade rice husk ash aqueous suspension on the silicon content in the modified opal was investigated.

[0166] The results are shown in Table 6:

[0167] Table 6 Effect of the solid-liquid mass ratio of the filter element raw material to the food-grade rice husk ash aqueous suspension on the silicon content in the modified opal

[0168] It can be seen from the data in Table 6 that:

[0169] Whether the proportion of the filter element raw material relative to the rice husk ash aqueous suspension is too much or too little will affect the silicon content of the modified filter element raw material. Therefore, the preferred solid-liquid mass ratio of the filter element raw material to the food-grade rice husk ash aqueous suspension is 1:(3-6).

[0170] 6. Temperature of food-grade rice husk ash aqueous suspension in silicon-supported strengthening treatment

[0171] The natural opal was modified according to the modification method of Example 1 to prepare a modified opal, except that the temperature of the food-grade rice husk ash aqueous suspension in step (6) was changed, and the effect of the temperature of the food-grade rice husk ash aqueous suspension on the silicon content in the modified opal was investigated.

[0172] The results are shown in Table 7:

[0173] Table 7 Effect of the temperature of the food-grade rice husk ash aqueous suspension on the silicon content in the modified opal

[0174] It can be seen from the data in Table 7 that:

[0175] Too low temperature of the food-grade rice husk ash aqueous suspension affects the silicon content of the modified filter element raw material. Therefore, the preferred temperature of the food-grade rice husk ash aqueous suspension is 85%-95%, and the most preferred is 90 °C.

[0176] The present application provides a mineralized filter medium in the third aspect. The mineralized filter medium includes the following components by weight: 5-15 parts of modified opal, 5-15 parts of modified medallion stone, and 5-20 parts of modified zeolite.

[0177] Preferably, the mineralized filter medium includes the following components by weight: 8-12 parts of modified opal, 8-12 parts of modified medallion stone, and 8-15 parts of modified zeolite.

[0178] The present application provides a mineralized filter element in a fourth aspect. The mineralized filter element comprises the following components by weight parts: 20 to 40 parts of mineralized filter material, 75 to 150 parts of adsorbent, and 30 to 40 parts of binder; wherein, the adsorbent comprises at least activated carbon.

[0179] Preferably, the mineralized filter element comprises the following components by weight parts: 30 to 40 parts of mineralized filter material, 80 to 120 parts of adsorbent, and 30 to 40 parts of binder.

[0180] Preferably, the adsorbent comprises activated carbon and modified diatomite, wherein the mass ratio of the activated carbon to the modified diatomite is (60 to 110):(15 to 40).

[0181] Preferably, the binder comprises one or more of food-grade polyethylene, food-grade polyvinyl chloride, food-grade polyvinyl alcohol, cellulose, and polylactic acid.

[0182] The mineralized filter material of the present application comprises modified opal, modified medical stone, and modified zeolite. By controlling the mass ratio of the modified opal, modified medical stone, and modified zeolite to be (1 to 3):(1 to 3):(1 to 4), the content of silicon in the mineralized filter material is regulated, and further the release concentration and release rate of metasilicic acid of the mineralized filter element prepared from the mineralized filter material are controlled. In addition, the mineralized filter materials of the present application are all obtained by mixing natural ores after modification, and no chemical substances are added, which is safe and hygienic.

[0183] The present application provides a preparation method of a mineralized filter element in a fourth aspect. The preparation method comprises:

[0184] (1) Mix the mineralized filter material, the adsorbent, and the binder evenly to obtain a mixed material.

[0185] (2) Put the mixed material into a filter element mold and sinter it at 180 to 200 °C and 14 to 18 MPa for 60 to 120 min to obtain the mineralized filter element.

[0186] The effects of the mineralized filter element of the present application are illustrated below by several specific examples of the mineralized filter element.

[0187] Example A

[0188] The mineralized filter element of this example is prepared through the following steps:

[0189] S1: Mix 35 parts of mineralized filter material, 100 parts of adsorbent, and 35 parts of binder (food-grade polyethylene) evenly to obtain a mixed material.

[0190] S2: Put the mixed material into a filter element mold (outer diameter 53 mm, inner diameter 35 mm) and sinter it at 200 °C and 18 MPa for 120 min to obtain the mineralized filter element.

[0191] Among them, the mineralized filter media includes the modified opal of Example 1, the modified medical stone of Example 2, and the modified zeolite of Example 3, and the ratio of modified opal:modified medical stone:modified zeolite = 1:1:1, and the adsorbent is activated carbon.

[0192] Example B

[0193] The mineralized filter element of this embodiment is prepared through the following steps:

[0194] S1: Mix 35 parts of mineralized filter media, 100 parts of adsorbent, and 35 parts of binder (food-grade polyethylene) evenly to obtain a mixed material.

[0195] S2: Put the mixed material into a filter element mold (outer diameter 53 mm, inner diameter 35 mm), and sinter at 200 °C and 18 MPa for 120 min to obtain a mineralized filter element.

[0196] Among them, the mineralized filter media includes the modified opal of Example 1, the modified medical stone of Example 2, and the modified zeolite of Example 3, and the ratio of modified opal:modified medical stone:modified zeolite = 1:1:1, and the adsorbent is activated carbon and modified diatomite, and the mass ratio of activated carbon to modified diatomite is 60:15, and the modified diatomite is the modified diatomite of Example 4.

[0197] The preparation process and raw materials of the mineralized filter elements of Examples C to R are the same as those of Example B, and the difference from Example B is that the addition amounts of each raw material are different, and the specific components of the mineralized filter elements are shown in Table 8.

[0198] Table 8 Component table of mineralized filter elements of Examples A to R

[0199] Comparative Example B

[0200] The mineralized filter element of this comparative example is prepared through the following steps:

[0201] S1: Mix 35 parts of mineralized filter media, 100 parts of adsorbent, and 35 parts of binder (food-grade polyethylene) evenly to obtain a mixed material.

[0202] S2: Put the mixed material into a filter element mold, and sinter at 200 °C and 18 MPa for 120 min to obtain a mineralized filter element.

[0203] Among them, the mineralized filter media include natural opal of Comparative Example 1, natural medical stone of Comparative Example 2, and natural zeolite of Comparative Example 3, with natural opal : natural medical stone : natural zeolite = 1:1:1. The adsorbing substances are activated carbon and natural diatomite of Comparative Example 4, and the mass ratio of activated carbon to natural diatomite is 60:15.

[0204] Test Example A

[0205] The mineralized filter elements prepared in Examples A to R and Comparative Example B were cut into filter rods with a length of 68 mm, assembled with end caps and O-rings into filter elements, and then installed at the water outlet end of the water purifier for experiments to detect the content of metasilicic acid in the water outlet of the water purifier. The detection data are shown in Table 9.

[0206] Among them, the specific detection method is as follows: The test water is pure water / RO water. According to the total mineralized water volume calculation, the mineralization process is divided into 4 segments. Samples are taken for testing after flowing through the mineralized filter element. A total of 5 batches of water samples are collected, and the sampling nodes are at the beginning of the formal water sample introduction (the first sampling, i.e., the water throughput is 0 L), the end of the 1 / 4 segment (the second sampling, i.e., the water throughput is 1000 L), the end of the 2 / 4 segment (the third sampling, i.e., the water throughput is 2000 L), the end of the 3 / 4 segment (the fourth sampling, i.e., the water throughput is 3000 L), and the end of the 4 / 4 segment (the fifth sampling, i.e., the water throughput is 4000 L). Before each sampling, the mineralization device is left standing for 1.5 hours, 700 ml is taken for testing, and the water samples are detected according to the method corresponding to GB / T5838.

[0207] Table 9 Application data table of mineralized filter elements in Examples A to R and Comparative Example B

[0208] It can be seen from the data in Table 9 that:

[0209] 1. Comparing Examples A to R with Comparative Example B, the metasilicic acid values detected at each node of the examples are much higher than those detected at the corresponding nodes of Comparative Example B. From this, it can be known that the mineralized filter element of the present application can stably release metasilicic acid, so that the filtered water contains a stable content of metasilicic acid. In addition, the mineralized filter elements of the present application are all natural raw materials, no chemical substances are added during the modification and preparation processes, and heavy metals in the ore are effectively removed, which is safe and hygienic.

[0210] 2. Compare Example A with Example B and Examples N - R. The metasilicate values of 1000L, 2000L, 3000L, and 4000L in Example B and Examples N - R are all higher than those of the corresponding 1000L, 2000L, 3000L, and 4000L in Example A. It can be seen from this that replacing part of the activated carbon in the adsorbent with modified diatomaceous earth not only ensures the adsorption capacity but also further ensures the stable presence of metasilicate substances in the filtered water, thereby improving the water quality and further increasing the service life of the mineralization filter element for releasing metasilicate. Therefore, the preferred adsorbent is activated carbon and modified diatomaceous earth, and the mass ratio of the activated carbon to the modified diatomaceous earth is (60 - 110):(15 - 40).

[0211] 3. Comparing Example B with Examples G and H, it can be seen that as the proportion of modified opal in the mineralization filter material increases, the initial metasilicate value increases, while the metasilicate values of 1000L, 2000L, 3000L, and 4000L show a decreasing trend. It can be seen from this that too high a proportion of modified opal in the mineralization filter material will affect the service life of the mineralization filter element for releasing metasilicate. Therefore, it is preferred that the mass ratio of modified opal, modified medical stone, and modified zeolite in the mineralization filter material is modified opal:modified medical stone:modified zeolite = (1 - 3):(1 - 3):(1 - 4).

[0212] 4. Comparing Example B with Examples I and J, it can be seen that as the proportion of modified medical stone in the mineralization filter material increases, the initial metasilicate value slightly decreases, and the metasilicate values of 1000L, 2000L, 3000L, and 4000L change little. It can be seen from this that appropriately adjusting the proportion of medical stone in the mineralization filter material helps the mineralization filter element maintain good performance in releasing metasilicate. Therefore, it is preferred that the mass ratio of modified opal, modified medical stone, and modified zeolite in the mineralization filter material is modified opal:modified medical stone:modified zeolite = (1 - 3):(1 - 3):(1 - 4).

[0213] 5. Comparing Example B with Examples K, L, and M, it can be seen that as the proportion of modified zeolite in the mineralization filter material increases, the initial metasilicate value changes little, while the metasilicate values of 1000L, 2000L, 3000L, and 4000L show an increasing trend. It can be seen from this that appropriately increasing the proportion of modified zeolite in the mineralization filter material can, to a certain extent, increase the service life of the mineralization filter element for releasing metasilicate. Therefore, it is preferred that the mass ratio of modified opal, modified medical stone, and modified zeolite in the mineralization filter material is modified opal:modified medical stone:modified zeolite = (1 - 3):(1 - 3):(1 - 4).

[0214] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principle of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A method for modifying filter element raw materials, characterized in that: The modification method comprises sequentially subjecting the filter element raw material to thermal activation modification treatment and silicon loading strengthening treatment, The thermal activation modification treatment specifically comprises calcining the filter element raw material at a first set temperature for a first set time, and then calcining at a second set temperature for a second set time, and after calcination, quenching the filter element raw material with water, wherein the second set temperature is higher than the first set temperature; The silicon-loaded strengthening treatment is specifically as follows: soaking the filter element raw material in a food-grade rice husk ash water suspension for a third set time, and then washing, drying and crushing to obtain a modified filter element raw material.

2. The method for modifying filter element raw materials according to claim 1, characterized in that: The first set temperature is 350°C to 400°C; And / or, the first set time is 1.5h to 2.5h; And / or, the second set temperature is 600° C. to 750° C.; And / or, the second set time is 1h to 3h; And / or, the rapid cooling water quenching is specifically to pour the hot filter element raw material into deionized water at 20°C to 25°C for cleaning, so as to quickly cool down the high-temperature filter element raw material after calcination; And / or, the third set time is 20h to 28h; and / or, the solid-to-liquid mass ratio of the filter element raw material to the food-grade rice husk ash water suspension is 1:(3-6); and / or, the concentration of the food-grade rice husk ash water suspension is 30-50 g / L; And / or, the temperature of the food-grade rice husk ash water suspension is 85°C to 95°C, preferably the temperature of the food-grade rice husk ash water suspension is 90°C.

3. The method for modifying filter element raw materials according to claim 1 or 2, characterized in that: The filter element raw material is pretreated before the thermal activation modification treatment, and the pretreatment includes screening treatment, electromagnetic iron removal treatment, ultrasonic treatment and gradient water washing treatment in sequence; The screening process is to crush the filter element raw material and put it into a vibrating screening machine to screen out particles larger than 5 cm, then use a color sorter to identify and remove foreign colored minerals, and then use a color sorter with a specific gravity of 2.6 g / cm 3 The heavy liquid separation quartz; The gradient water washing treatment is specifically as follows: at 55°C to 65°C, the filter element raw material is countercurrently washed for 15min to 25min under the first water pressure, the second water pressure and the third water pressure respectively, and then dried and crushed to 35 to 200 meshes, and the first water pressure, the second water pressure and the third water pressure are increased in sequence.

4. The method for modifying filter element raw materials according to claim 3, characterized in that: The first water pressure is 0.2 MPa; And / or, the second water pressure is 0.5 MPa; And / or, the third water pressure is 0.8 MPa.

5. A modified filter element raw material, characterized in that: The modified filter element raw material is a natural filter element raw material modified by the filter element raw material modification method described in any one of claims 1 to 4.

6. The modified filter element raw material according to claim 5, characterized in that: The modified filter element raw material includes one or more of modified medical stone, modified diatomaceous earth, modified zeolite and modified opal.

7. A mineralized filter material, characterized in that: The mineralized filter material comprises modified opal, modified medical stone and modified zeolite, wherein the mass ratio of the modified opal, the modified medical stone and the modified zeolite is modified opal: modified medical stone: modified zeolite = (1-3): (1-3): (1-4); Among them, the modified opal is obtained by modifying natural opal as the filter element raw material through the filter element raw material modification method described in any one of claims 1 to 4; the modified medical stone is obtained by modifying natural medical stone as the filter element raw material through the filter element raw material modification method described in any one of claims 1 to 4; the modified zeolite is obtained by modifying natural zeolite as the filter element raw material through the filter element raw material modification method described in any one of claims 1 to 4.

8. A mineralized filter element, characterized in that: The mineralized filter element comprises the following components by weight: 20 to 40 parts of mineralized filter material, 60 to 150 parts of adsorbent, and 30 to 40 parts of binder; Wherein, the mineralized filter material is the mineralized filter material according to claim 7, and the adsorbent material at least includes activated carbon.

9. The mineralized filter element according to claim 8, characterized in that: The adsorbent comprises activated carbon and modified diatomaceous earth, wherein the mass ratio of the activated carbon to the modified diatomaceous earth is (60-110):(15-40), and the modified diatomaceous earth is prepared by using natural diatomaceous earth as a filter element raw material and modifying it by the filter element raw material modification method according to any one of claims 1 to 4; And / or, the binder includes one or more of food grade polyethylene, food grade polyvinyl chloride, food grade polyvinyl alcohol, cellulose, and polylactic acid.

10. A method for preparing a mineralized filter element, used for preparing the mineralized filter element according to claim 8 or 9, characterized in that: The preparation method comprises: (1) uniformly mixing the mineralized filter material, the adsorbent, and the binder to obtain a mixture; (2) placing the mixture into a filter element mold, and sintering at 180-200° C. and 14-18 MPa for 60-120 min to obtain the mineralized filter element.

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