Strontium mineralized slow-release filter element and preparation method thereof, and water purifier

Abstract

The application provides a strontium mineralization slow-release filter element and a preparation method and a water purifier. The strontium mineralization slow-release filter element comprises the following components in parts by weight: 4-10 parts of celestite powder, 80-250 parts of activated carbon and 40-125 parts of glue powder. The particle size of the celestite powder is 120-200 meshes. The particle size of the activated carbon is 80-120 meshes. The molecular weight of the glue powder is 300,000-5,000,000. The strontium mineralization slow-release filter element can ensure that the strontium element concentration in mineral water is not too high, and can control the slow and stable release of the strontium element, which is beneficial to promoting the health of human bodies.

Description

Technical Field

[0001] This invention belongs to the field of water purifier technology, specifically relating to a strontium mineralized slow-release filter element and its preparation method, as well as a water purifier. Background Technology

[0002] The molding process of mineralized filter elements generally involves mixing activated carbon, adhesive powder, and mineral powder, sintering or extruding them at high temperature, cooling them, cutting them into the required size, and then assembling them into a shell to obtain the finished product.

[0003] Strontium is a vital trace element for the human body. It primarily promotes bone and teeth growth and development, and is an essential trace element found in all human tissues. Excessive sodium in the body can easily lead to high blood pressure, high cholesterol, high blood sugar, and cardiovascular diseases, while strontium can reduce the body's absorption of sodium, thus helping to prevent these conditions. Strontium-containing mineral water can strengthen bones, improve intelligence, delay aging, and has supplementary beauty benefits.

[0004] Currently, the main source of strontium for the human body is mineral water. This is achieved by using mineralization filters, where mineral raw materials release trace elements like strontium into the water, which the body then absorbs through drinking. Specifically, this involves using a mineralization filter as a post-filter in a reverse osmosis water purifier. When purified water filtered through the reverse osmosis membrane passes through the mineralization filter, the mineral raw materials in the filter release trace elements into the water, mineralizing it and promoting human health.

[0005] Although pure water can be used directly as drinking water, it is generally produced using tap water as the raw material and undergoes a combination of water treatment processes such as reverse osmosis, distillation, electrodialysis, and ion exchange resins to meet drinking water standards, including distilled water and space water. Therefore, in the production process of pure water, while removing harmful organic matter and bacteria, beneficial and essential minerals and trace elements are also removed, resulting in a loss of nutritional value for drinking water. Thus, providing mineral water containing trace elements such as strontium is of great significance for promoting human health.

[0006] The molding process of mineralized filter elements generally involves mixing activated carbon, adhesive powder, and mineral powder, sintering or extruding them at high temperature, cooling them, cutting them into the required size, and then assembling them into a shell to obtain the finished product.

[0007] While strontium has certain health benefits, the strontium content in water should not be too high. Moderate consumption is beneficial, but excessive intake may irritate the gastrointestinal mucosa, causing adverse reactions such as nausea, vomiting, and abdominal pain. Furthermore, excessively high strontium levels in mineral water may interfere with calcium absorption and metabolism, or lead to excessively rapid bone growth and development, causing pain. Therefore, it is necessary to control the strontium content in mineral water within a certain range.

[0008] Meanwhile, the lifespan of most mineralized filter cartridges in water purifiers is over 4000L. Currently, the strontium mineralization concentration of mineralized filter cartridges has a problem of excessive decay rate, that is, the concentration is very high at the beginning and very low in the later stage. It cannot be released stably throughout the entire lifespan, which will also bring health risks to users.

[0009] In view of this, a strontium mineralization slow-release filter cartridge is provided, which can prevent the concentration of strontium in mineral water from being too high, and at the same time control the slow and stable release of strontium, which is of great significance to human health. Summary of the Invention

[0010] To address the problems and shortcomings of existing technologies, this invention provides a strontium mineralization slow-release filter element, its preparation method, and a water purifier. This strontium mineralization slow-release filter element can ensure that the concentration of strontium in mineral water is not too high, while also controlling the slow and stable release of strontium, which is beneficial to promoting human health.

[0011] According to a first aspect of the present invention, a strontium mineralized filter element is provided, comprising, by weight, the following components: 4-10 parts of celestite powder, 80-250 parts of activated carbon, and 40-125 parts of adhesive powder; the particle size of the celestite powder is 120-200 mesh; the particle size of the activated carbon is 80-120 mesh; and the molecular weight of the adhesive powder is 300,000-5,000,000.

[0012] The main chemical component of celestite is (Sr,Ba)SO4, with Sr content greater than Ba ​​content. It may also contain elements such as Pb, Ca, and Fe. It is mainly found in sedimentary rocks such as dolomite, limestone, marl, and gypsum-bearing clay, and occurs in hydrothermal and sedimentary deposits. Therefore, using celestite as one of the main raw materials for mineralized filter cartridges can provide strontium to drinking mineral water, allowing the human body to obtain a certain amount of strontium and promoting health. Furthermore, strontium mineralized filter cartridges prepared by mixing celestite, activated carbon, and adhesive powder in a certain mass ratio can: firstly, control the concentration of strontium in the output drinking mineral water to prevent it from becoming too high; and secondly, achieve a slow release of strontium, ensuring that the concentration of strontium released by the filter cartridge remains stable within a low range throughout its lifespan. This is beneficial to human health while avoiding the health risks posed by excessively high strontium concentrations in the water in the early stages.

[0013] Furthermore, controlling the particle size of celestite and activated carbon within a certain range, with the activated carbon particle size being slightly larger than that of celestite, allows these two types of particles to work together, resulting in a strontium mineralization filter element with a suitable pore size. This controls the slow release of strontium and ensures that the strontium concentration in the effluent from the filter element is not too high. This guarantees an appropriate amount of strontium ingested by the human body without excessive strontium entering the body and harming health. Moreover, controlling the molecular weight of the adhesive powder within a certain range ensures sufficient bonding strength, tightly binding the celestite and activated carbon together. This improves the stability of the strontium mineralization filter element, extends its service life, and further ensures the slow release of strontium. Conversely, if the molecular weight of the adhesive powder is too small, the bonding strength is too weak, failing to tightly bind the celestite and activated carbon together, reducing the structural stability of the strontium mineralization filter element and shortening its service life. If the molecular weight of the adhesive powder is too large, it will be difficult to melt because the adhesive powder needs to be calcined at high temperature when mixed with celestite and activated carbon. This will also result in insufficient adhesion between celestite and activated carbon, thereby reducing the structural stability and service life of the strontium mineralized filter element.

[0014] Preferably, the adhesive powder is polyethylene adhesive powder. Polyethylene adhesive powder can cure rapidly in a short time and provides strong adhesion. Polyethylene adhesive powder has excellent impact resistance and deformation ability, which can further improve the structural stability of the strontium mineralization filter element, so that it can still have good strength and hardness after long-term water filtration, which is conducive to improving the service life of the strontium mineralization filter element.

[0015] Preferably, the iodine value of the activated carbon is between 800 and 1600. Iodine value refers to the amount of iodine adsorbed by activated carbon in a 0.02 N⁻¹² / KL aqueous solution. The iodine value of activated carbon is one of the most commonly used indicators for evaluating its adsorption performance; the higher the iodine value, the stronger the adsorption performance. Therefore, controlling the iodine value of the activated carbon within the above range helps ensure that the strontium mineralization filter element has a strong adsorption capacity, further adsorbing some harmful impurities, improving the drinking safety of the effluent, and further benefiting human health.

[0016] According to a second aspect of the present invention, a method for preparing the above-mentioned strontium mineralization filter element is provided, comprising the following steps: S1. placing celestite powder in a silicate solution, and then reacting it at 50-80°C for 1-3 hours. After the reaction is completed, solid-liquid separation is performed, and the obtained filter residue is dried to obtain a first solid powder; S2. placing the first solid powder in a vacuum and calcining it at 400-600°C for 1-3 hours to obtain a second solid powder; S3. mixing the second solid powder with activated carbon and adhesive powder evenly, and then processing and molding it to obtain a strontium mineralization slow-release filter element.

[0017] First, celestite is placed in a silicate solution and reacted at a certain temperature. During the reaction, silicate ions in the silicate adsorb onto the strontium sulfate surface of the celestite. Since strontium sulfate is the main component of celestite, this passivates the celestite surface. In other words, the adsorption of silicate ions on the celestite surface reduces its surface activity. When using a strontium mineralization filter cartridge for water filtration, a smaller amount of strontium can be controlled to precipitate out. This controls the slow release of strontium from the celestite, avoiding the problem of excessively high strontium concentration in the early stages and very low concentration in the later stages, as seen in ordinary strontium mineralization filter cartridges. This ensures a slow and stable release of strontium throughout the filter cartridge's lifespan, which is beneficial to human health. Second, calcining the passivated celestite solid powder at a certain temperature improves its strength, hardness, and other mechanical properties, further enhancing the structural stability of the strontium mineralization filter cartridge and effectively controlling the slow release of strontium. Finally, the calcined celestite solid powder is mixed with activated carbon and adhesive powder and then processed into shape. During the processing, the adhesive powder melts, which tightly connects the celestite solid powder and activated carbon together, improving the structural strength of the entire strontium mineralization filter element and preventing it from being damaged by the impact force during water filtration, thus reducing the service life of the strontium mineralization filter element.

[0018] Preferably, in S1, the concentration of silicate is 0.05–0.5 mol / L. The concentration of silicate should not be too low or too high. If it is too low, it will not effectively passivate the surface of celestite to a certain extent, resulting in poor slow-release performance of strontium. If it is too high, it will over-passivate the surface of celestite, resulting in too little of the element being released into the water, which is also detrimental to human health.

[0019] Preferably, in S1, the mass ratio of celestite to silicate solution is 1:10 to 50. Maintaining this mass ratio within a certain range ensures that the silicate solution adequately wets the celestite, allowing silicate ions to fully bind to the celestite surface for effective passivation, while also preventing excessive passivation by silicate ions that could affect the release of strontium.

[0020] Preferably, in S1, the method for preparing celestite powder includes the following specific operations: taking natural celestite and sequentially washing, drying, crushing, and sieving it to obtain celestite powder.

[0021] Preferably, in S1, the silicate solution includes at least one of sodium silicate solution and potassium silicate solution.

[0022] Preferably, in S1, the silicate solution is a sodium silicate solution.

[0023] Preferably, in step S2, the drying temperature of the filter residue is 65–95°C, and the drying time is 1.5–3 hours.

[0024] Preferably, in step S3, the particle size of the adhesive powder is 120-200 mesh. Controlling the particle size of the adhesive powder within this range ensures that it can form a tight and uniform network structure with celestite and activated carbon during mixing. This allows the adhesive powder to melt and tightly bond the celestite and activated carbon together during processing, improving the structural strength of the strontium mineralization filter element and its ability to slowly release strontium. Simultaneously, a suitable particle size facilitates the complete melting of the adhesive powder, maximizing its bonding ability. If the particle size is too small, the adhesive ability is poor, and the celestite and activated carbon cannot be effectively bonded into a tight bond during processing. If the particle size is too large, the adhesive powder cannot melt completely during processing, and the uniformity of the adhesive powder in the celestite and activated carbon is reduced, which is also detrimental to bonding the celestite and activated carbon into a tight bond, reducing the structural strength of the strontium mineralization filter element and its ability to slowly release strontium.

[0025] According to a third aspect of the present invention, a water purifier is provided, comprising the aforementioned strontium mineralization filter element. Using the aforementioned strontium mineralization filter element as part of the water purifier allows the obtained water sample to contain a certain amount of strontium, promoting human health. Furthermore, in the water purifier provided by the present invention, because the water purifier includes the strontium mineralization filter element of the present invention, and the strontium mineralization filter element of the present invention has advantages such as high strength and good stability, it has a long service life, that is, a high water flow rate, and can still stably and slowly release strontium into the water during the water treatment process even after the water flow rate exceeds 4000L.

[0026] According to a fourth aspect of the present invention, a method for using the above-mentioned water purifier is provided, comprising the following steps: passing pure water through a strontium mineralization filter element; the outflow rate of the strontium mineralization filter element is 2.0 to 4.0 L / min. By controlling a certain outflow rate, the strontium ore filter element can be effectively wetted and the strontium element in the strontium ore can be released at a certain rate. This is beneficial for the pure water to contain a certain amount of strontium element in the outflow sample after passing through the strontium ore filter element, and also helps to control the slow release rate of strontium element. In addition, such an outflow rate is not too fast, avoiding excessively fast outflow rates from causing a certain impact force on the strontium ore filter element, deteriorating the strength of the strontium ore filter element, and affecting its service life.

[0027] In summary, the strontium mineralization slow-release filter element provided by this invention, through the combined effect of a specific mass ratio of celestite, activated carbon, and adhesive powder, and by simultaneously controlling the particle size of celestite and activated carbon as well as the molecular weight of the adhesive powder, enables the strontium mineralization slow-release filter element to have high structural strength and a long service life. Furthermore, it can control the strontium concentration in the effluent passing through this strontium mineralization filter element to be low, and can control the slow release of strontium, which has positive implications for human health. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] Preparation of Celestite Powder: Natural celestite is sequentially washed, dried, crushed, and sieved to obtain celestite powder. The particle size of the celestite powder is 120-200 mesh. All celestite powder used in this invention is obtained using the above preparation method; the specific particle size can be adjusted according to actual conditions.

[0030] Example 1

[0031] The strontium mineralization slow-release filter element of this embodiment was prepared according to the following steps:

[0032] S1. Celestite powder was placed in sodium silicate solution and then reacted at 80℃ for 3 hours. After the reaction was completed, solid-liquid separation was performed, and the obtained filter residue was dried in a muffle furnace at 80℃ for 2 hours to obtain the first solid powder. The mass ratio of celestite powder to sodium silicate solution was 1:10, and the concentration of sodium silicate solution was 0.05 mol / L.

[0033] S2. The first solid powder is placed in a vacuum furnace and calcined at 500°C for 3 hours to obtain the second solid powder;

[0034] S3. The second solid powder is mixed evenly with activated carbon and polyethylene powder by a mixer, and then extruded by an extruder to obtain a strontium mineralized slow-release filter element.

[0035] The materials used in preparing the strontium mineralized filter element in this embodiment are as follows: 8 parts of celestite powder, 200 parts of activated carbon, and 80 parts of polyethylene powder (each part is 1g); the particle size of the celestite powder is 80-120 mesh; the particle size of the activated carbon is 80-120 mesh, and the iodine value is 1200; the molecular weight of the polyethylene powder is 1-2 million, and the particle size is 120-200 mesh.

[0036] Example 2

[0037] The strontium mineralization slow-release filter element of this embodiment was prepared according to the following steps:

[0038] S1. Celestite powder was placed in sodium silicate solution and then reacted at 80℃ for 3 hours. After the reaction was completed, solid-liquid separation was performed, and the obtained filter residue was dried in a muffle furnace at 80℃ for 2 hours to obtain the first solid powder. The mass ratio of celestite powder to sodium silicate solution was 1:10, and the concentration of sodium silicate solution was 0.25 mol / L.

[0039] S2. The first solid powder is placed in a vacuum furnace and calcined at 500°C for 3 hours to obtain the second solid powder;

[0040] S3. The second solid powder is mixed evenly with activated carbon and polyethylene powder by a mixer, and then extruded by an extruder to obtain a strontium mineralized slow-release filter element.

[0041] The materials used in preparing the strontium mineralized filter element in this embodiment are as follows: 8 parts of celestite powder, 200 parts of activated carbon, and 80 parts of polyethylene powder (each part is 1g); the particle size of the celestite powder is 80-120 mesh; the particle size of the activated carbon is 80-120 mesh, and the iodine value is 1200; the molecular weight of the polyethylene powder is 1-2 million, and the particle size is 120-200 mesh.

[0042] Example 3

[0043] The strontium mineralization slow-release filter element of this embodiment was prepared according to the following steps:

[0044] S1. Celestite powder was placed in sodium silicate solution and then reacted at 80℃ for 3 hours. After the reaction was completed, solid-liquid separation was performed, and the obtained filter residue was dried in a muffle furnace at 80℃ for 2 hours to obtain the first solid powder. The mass ratio of celestite powder to sodium silicate solution was 1:10, and the concentration of sodium silicate solution was 0.5 mol / L.

[0045] S2. The first solid powder is placed in a vacuum furnace and calcined at 500°C for 3 hours to obtain the second solid powder;

[0046] S3. The second solid powder is mixed evenly with activated carbon and polyethylene powder by a mixer, and then extruded by an extruder to obtain a strontium mineralized slow-release filter element.

[0047] The materials used in preparing the strontium mineralized filter element in this embodiment are as follows: 8 parts of celestite powder, 200 parts of activated carbon, and 80 parts of polyethylene powder (each part is 1g); the particle size of the celestite powder is 80-120 mesh; the particle size of the activated carbon is 80-120 mesh, and the iodine value is 1200; the molecular weight of the polyethylene powder is 1-2 million, and the particle size is 120-200 mesh.

[0048] Example 4

[0049] The strontium mineralization slow-release filter element of this embodiment was prepared according to the following steps:

[0050] S1. Celestite powder was placed in sodium silicate solution and then reacted at 80℃ for 3 hours. After the reaction was completed, solid-liquid separation was performed, and the obtained filter residue was dried in a muffle furnace at 80℃ for 2 hours to obtain the first solid powder. The mass ratio of celestite powder to sodium silicate solution was 1:10, and the concentration of sodium silicate solution was 0.25 mol / L.

[0051] S2. The first solid powder is placed in a vacuum furnace and calcined at 400°C for 3 hours to obtain the second solid powder;

[0052] S3. The second solid powder is mixed evenly with activated carbon and polyethylene powder by a mixer, and then extruded by an extruder to obtain a strontium mineralized slow-release filter element.

[0053] The materials used in preparing the strontium mineralized filter element in this embodiment are as follows: 8 parts of celestite powder, 200 parts of activated carbon, and 80 parts of polyethylene powder (each part is 1g); the particle size of the celestite powder is 80-120 mesh; the particle size of the activated carbon is 80-120 mesh, and the iodine value is 1200; the molecular weight of the polyethylene powder is 1-2 million, and the particle size is 120-200 mesh.

[0054] Example 5

[0055] The strontium mineralization slow-release filter element of this embodiment was prepared according to the following steps:

[0056] S1. Celestite powder was placed in sodium silicate solution and then reacted at 80℃ for 3 hours. After the reaction was completed, solid-liquid separation was performed, and the obtained filter residue was dried in a muffle furnace at 80℃ for 2 hours to obtain the first solid powder. The mass ratio of celestite powder to sodium silicate solution was 1:10, and the concentration of sodium silicate solution was 0.25 mol / L.

[0057] S2. The first solid powder is placed in a vacuum furnace and calcined at 600°C for 3 hours to obtain the second solid powder;

[0058] S3. The second solid powder is mixed evenly with activated carbon and polyethylene powder by a mixer, and then extruded by an extruder to obtain a strontium mineralized slow-release filter element.

[0059] The materials used in preparing the strontium mineralized filter element in this embodiment are as follows: 8 parts of celestite powder, 200 parts of activated carbon, and 80 parts of polyethylene powder (each part is 1g); the particle size of the celestite powder is 80-120 mesh; the particle size of the activated carbon is 80-120 mesh, and the iodine value is 1200; the molecular weight of the polyethylene powder is 1 million to 2.5 million, and the particle size is 120-200 mesh.

[0060] Example 6

[0061] The difference between this embodiment and Embodiment 2 is that the materials used to prepare the strontium mineralized filter element are as follows: 4 parts of celestite powder, 250 parts of activated carbon, and 100 parts of polyethylene powder (each part is 1g); the rest is the same as in Embodiment 2.

[0062] Example 7

[0063] The difference between this embodiment and Embodiment 2 is that the materials used to prepare the strontium mineralized filter element are as follows: 10 parts of celestite powder, 240 parts of activated carbon, and 60 parts of polyethylene powder (each part is 1g); the rest is the same as in Embodiment 2.

[0064] Example 8

[0065] The difference between this embodiment and Embodiment 2 is that the molecular weight of the polyethylene powder used is 300,000 to 950,000; otherwise, it is the same as Embodiment 2.

[0066] Example 9

[0067] The difference between this embodiment and Embodiment 2 is that the molecular weight of the polyethylene powder used is 3 to 5 million; otherwise, it is the same as Embodiment 2.

[0068] Comparative Example 1

[0069] The difference between this comparative example and Example 2 is that the materials used to prepare the strontium mineralized filter element are as follows: 2 parts celestite powder, 250 parts activated carbon, and 40 parts polyethylene powder (each part is 1g); the rest is the same as in Example 2.

[0070] Comparative Example 2

[0071] The difference between this comparative example and Example 2 is that the materials used to prepare the strontium mineralized filter element are as follows: 20 parts of celestite powder, 220 parts of activated carbon, and 50 parts of polyethylene powder (each part is 1g); the rest is the same as in Example 2.

[0072] Comparative Example 3

[0073] The difference between this comparative example and Example 2 is that the celestite used has a particle size of 60-110 mesh; otherwise, it is the same as Example 2.

[0074] Comparative Example 4

[0075] The difference between this comparative example and Example 2 is that the celestite used has a particle size of 220-300 mesh; otherwise, it is the same as Example 2.

[0076] Comparative Example 5

[0077] The difference between this comparative example and Example 2 is that the activated carbon used has a particle size of 30-70 mesh; otherwise, it is the same as Example 2.

[0078] Comparative Example 6

[0079] The difference between this comparative example and Example 2 is that the activated carbon used has a particle size of 140-180 mesh; otherwise, it is the same as Example 2.

[0080] Comparative Example 7

[0081] The difference between this comparative example and Example 2 is that the molecular weight of the polyethylene powder used is 50,000 to 200,000; otherwise, it is the same as Example 2.

[0082] Comparative Example 8

[0083] The difference between this comparative example and Example 2 is that the molecular weight of the polyethylene powder used is 5.5 million to 7 million; otherwise, it is the same as Example 2.

[0084] Test case

[0085] 1. Experimental Construction Method

[0086] Tests of strontium concentration after the filter cartridge at different water flow rates:

[0087] The filter cartridges prepared in all the above embodiments and comparative examples were installed at the end of the pure water machine for continuous water flow test. The water flow rate was 3.0L / min. Water samples were taken to test the strontium concentration when the water flow reached 1000L, 3000L, 4000L, 5000L and 8000L respectively, and compared with "GB 8537-2018 Drinking Natural Mineral Water".

[0088] 2. Experimental Results

[0089] The test results of the outflow rate and strontium concentration of the filter cartridges prepared in all the above embodiments and comparative examples are shown in Table 1.

[0090] Table 1 shows the test results of the effluent flow rate and strontium concentration at different flow rates for the filter cartridges prepared in all the above embodiments and comparative examples.

[0091]

[0092]

[0093] As shown in Table 1, the strontium mineralization filter element provided by this invention can effectively provide a certain amount of strontium to pure water, promoting human health. Referring specifically to the performance data of Examples 1-13 in Table 1, it can be seen that under water flow rates of 1000L, 3000L, 4000L, 5000L, and 8000L, the strontium mineral filter element provided by this invention can still release a certain amount of strontium, exhibiting a long service life. Furthermore, under different water flow rates, the strontium content in the effluent water samples remains within a low range, posing no significant harm to human health. Compared to the national standard, which only specifies a strontium content >0.2 without an upper limit, the strontium mineralization filter element provided by this invention not only meets the national drinking water standard at lower initial water flow rates but also releases strontium relatively stably over a long period, which is more beneficial to human health. This is because excessively high strontium levels or rapid decay are not conducive to providing a stable strontium content to the human body in the long term.

[0094] Further comparing Examples 1-3, the concentrations of sodium silicate solutions used in Examples 1-3 were 0.05 mol / L, 0.25 mol / L, and 0.5 mol / L, respectively. In Example 1, the strontium content was higher in the early stages when the water flow rate was lower, but lower in the later stages when the water flow rate was higher. This indicates that the strontium slow-release performance of the strontium mineralization filter element in Example 1 was relatively poor, which is detrimental to human health. In Example 3, the overall strontium content was relatively stable, but the strontium content was low in the early stages when the water flow rate was low, resulting in a lower strontium content even when the water flow rate was higher. This would lead to insufficient strontium intake by the human body, which is also not beneficial to human health. Example 2 not only maintained a relatively stable strontium content throughout the entire process, from the initial low water flow rate to the later high water flow rate, but also showed a higher strontium content initially compared to Example 3. This ensured a suitable strontium content even with the later high water flow rate, which is more beneficial for promoting human health. Therefore, controlling the sodium silicate concentration at 0.25 mol / L is most effective in controlling the strontium content and slow-release performance of the strontium mineralization filter element.

[0095] Comparing Examples 2, 4, and 5, the calcination temperatures in Examples 2, 4, and 5 were 500℃, 400℃, and 600℃, respectively. In Example 4, the strontium content was higher when the initial water flow rate was lower than in Example 2. However, in Example 4, the strontium content was lower when the later water flow rate was higher than in Example 2. Therefore, the strontium slow-release performance of the strontium mineralization filter element in Example 4 was worse than that in Example 2. Example 5 is similar to Example 3; the strontium content was low when the initial water flow rate was low, resulting in a low strontium content even when the water flow rate was high. This could lead to insufficient strontium intake by the human body, which is not beneficial to human health. Therefore, controlling the calcination temperature at 500℃ is beneficial for balancing the strontium content in the effluent and the slow-release performance of the strontium mineralization filter element.

[0096] Comparing Examples 2, 6, and 7 with Comparative Examples 1 and 2, the mass ratios of celestite, activated carbon, and polyethylene powder used in Examples 2, 6, and 7 and Comparative Examples 1 and 2 differed. This resulted in variations in the strontium content and strontium level of the strontium mineralized filter cartridges under different water flow rates. This indicates that the mass ratio of celestite, activated carbon, and polyethylene powder also affects the effluent strontium content and strontium slow-release performance of the strontium ore filter cartridge. In particular, in Comparative Examples 1 and 2, where the mass ratio of celestite, activated carbon, and polyethylene powder was not within the range of 4–10:80–250:40–125, the effluent strontium content or strontium slow-release performance of the strontium ore filter cartridges exhibited more significant deterioration. Comparing Examples 2 and 3-8, Comparative Examples 3-4 show celestite particle sizes that are too large and too small, respectively; Comparative Examples 5-6 show activated carbon particle sizes that are too large and too small, respectively; and Comparative Examples 7-8 show polyethylene powder sizes that are too small and too large, respectively. All these factors lead to a significant deterioration in the strontium content or strontium slow-release performance of the strontium ore filter cartridge compared to Example 2. Therefore, it is necessary to control the celestite particle size, activated carbon particle size, and polyethylene powder molecular weight within a certain range to better ensure that the strontium release amount of the strontium ore slow-release filter cartridge remains within a low range while maintaining a stable long-term release, thus exhibiting better strontium slow-release performance.

[0097] Of particular note is the comparison between Example 2 and the national drinking water standard. The national standard stipulates that the strontium content in natural mineral water should be greater than 0.2 mg / L. The strontium mineralization filter element in Example 2 not only meets this requirement at low flow rates but also at high flow rates of 8000 L. Furthermore, the difference in strontium release throughout the process is small, indicating that the strontium mineralization filter element in Example 2 has better sustained-release performance, capable of releasing strontium at a level greater than 0.2 mg / L for an extended period, while maintaining a relatively low strontium content (only 0.4 mg / L at the initial low flow rate of 1000 L), which is more beneficial to human health. In contrast, other examples, compared to Example 2, either have a shorter lifespan, failing to reach 0.2 mg / L later, or start with too high a level, posing safety risks and generally exhibiting rapid decay. Example 2, however, maintains a level greater than 0.2 mg / L throughout its entire lifespan, with stable decay, avoiding excessively high or low levels, demonstrating a sustained-release effect.

[0098] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention, but such modifications or substitutions are all within the scope of protection of the present invention.

Claims

1. A strontium mineralized filter element, characterized in that, The composition, calculated by weight, includes the following components: 4-10 parts of celestite powder, 80-250 parts of activated carbon, and 40-125 parts of adhesive powder. The particle size of the celestite powder is 120-200 mesh; The activated carbon has a particle size of 80-120 mesh; the adhesive powder has a molecular weight of 300,000-5,000,000. The preparation method of the strontium mineralized filter element is as follows: S1. The celestite powder is placed in a silicate solution and then kept at 50-80°C for 1-3 hours. After the reaction is completed, solid-liquid separation is performed, and the obtained filter residue is dried to obtain the first solid powder. S2. The first solid powder is placed in a vacuum and calcined at 400-600°C for 1-3 hours to obtain the second solid powder; S3. The second solid powder is mixed evenly with the activated carbon and the adhesive powder, and then processed and shaped to obtain the strontium mineralized slow-release filter element.

2. The strontium mineralization filter element as described in claim 1, characterized in that: The adhesive powder is polyethylene adhesive powder.

3. The strontium mineralization filter element as described in claim 1, characterized in that: The activated carbon has an iodine value of 800 to 1600.

4. The strontium mineralization filter element as described in claim 1, characterized in that: In S1, the concentration of the silicate is 0.05–0.5 mol / L.

5. The strontium mineralization filter element as described in claim 4, characterized in that: In S1, the mass ratio of celestite to silicate solution is 1:10 to 50.

6. The strontium mineralization filter element as described in claim 1, characterized in that: In S1, the silicate solution includes at least one of sodium silicate solution and potassium silicate solution.

7. The strontium mineralization filter element as described in claim 1, characterized in that: In step S3, the particle size of the adhesive powder is 120-200 mesh.

8. A water purifier, characterized in that: Includes the strontium mineralized filter element as described in any one of claims 1 to 7.

9. A method of using the water purifier as described in claim 8, characterized in that, Includes the following steps: Pure water is passed through the strontium mineralization filter element; the outflow rate of the strontium mineralization filter element is 2.0 to 4.0 L / min.

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