Mineral element sustained-release material composition as well as preparation method and application thereof

Abstract

The invention relates to the technical field of sustained-release materials, and provides a mineral element sustained-release material composition, the sustained-release material composition comprises a zinc sustained-release material and a strontium sustained-release material, the zinc sustained-release material comprises zinc polyphosphate loaded on a carrier skeleton, and based on the total mass of the zinc sustained-release material, the loading amount of the zinc polyphosphate is 55-70%. By compounding the specific zinc slow-release material and the strontium slow-release material, high-concentration and stable zinc ion release under the working condition of flowing water can be realized, the zinc ion concentration reaches 0.65 mg / L, and effective sterilization is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of sustained-release materials, and particularly to a mineral element sustained-release material composition, a preparation method thereof, and an application thereof. Background Art

[0002] Zinc is one of the essential trace elements for the human body, and it has functions such as maintaining normal appetite of the human body and enhancing human immunity. When the concentration of zinc ions in water reaches more than 0.65 mg / L, it has good inhibitory and killing effects on microorganisms that threaten human health, such as Staphylococcus aureus and Escherichia coli.

[0003] Currently, the commercially available mineral element sustained-release materials mainly include strontium, selenium, zinc, metasilicic acid, etc., and are mostly used for drinking water. There is relatively little research on materials that can stably release zinc at a high concentration in domestic water scenarios such as facial cleansing and bath.

[0004] CN110090490A provides a bathing and washing water purification filter element with beauty effects and a preparation method thereof. It mixes raw materials such as high-temperature resistant nano-bacteriostatic materials, metasilicic acid spherical powder particles, food-grade calcium sulfite, modified strontium-rich ore powder particles and carbon powder in a certain proportion to make a sintered activated carbon rod. The water discharged from the filter element is rich in metasilicate ions, zinc ions, and strontium ions. The sustained-release amount of zinc ions is 0.13 - 0.25 mg / L, which fails to reach the minimum bactericidal concentration of 0.65 mg / L. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the related art. For this purpose, the present invention provides a mineral element sustained-release material composition, and the mineral element sustained-release material composition can stably release zinc ions above 0.65 mg / L.

[0006] The present invention also provides a preparation method of a mineral element sustained-release material composition.

[0007] The present invention also provides an application of a mineral element sustained-release material composition.

[0008] In a first aspect, the present invention provides a mineral element sustained-release material composition, including a zinc sustained-release material and a strontium sustained-release material. The zinc sustained-release material includes zinc polyphosphate loaded on a carrier skeleton. Based on the total mass of the zinc sustained-release material, the loading amount of zinc polyphosphate is 55 - 70%.

[0009] According to the mineral element sustained-release material composition provided by the present invention, the carrier skeleton is quartz sand with a mesh size of 100 - 120.

[0010] According to the mineral element sustained-release material composition provided by the present invention, the zinc sustained-release material is granular, and the particle size is 1 - 4 millimeters.

[0011] According to the mineral element sustained-release material composition provided by the present invention, the zinc sustained-release material is made from the following raw materials by weight:

[0012]

[0013] Among them, the molar ratio of zinc element to phosphate ion should be controlled to be 1:0.5 - 1:0.8.

[0014] According to the mineral element sustained-release material composition provided by the present invention, the phosphate is selected from one or more of sodium phosphate, disodium hydrogen phosphate, sodium dihydrogen phosphate, potassium phosphate, dipotassium hydrogen phosphate, potassium dihydrogen phosphate, calcium phosphate, calcium hydrogen phosphate, calcium dihydrogen phosphate, magnesium phosphate, magnesium hydrogen phosphate, magnesium dihydrogen phosphate; preferably one or more of calcium phosphate, calcium hydrogen phosphate, calcium dihydrogen phosphate, and more preferably calcium hydrogen phosphate and calcium dihydrogen phosphate.

[0015] According to the mineral element sustained-release material composition provided by the present invention, the flux is selected from one or more of boron oxide, calcium oxide, phosphorus oxide, and preferably boron oxide and calcium oxide.

[0016] According to the mineral element sustained-release material composition provided by the present invention, the strontium sustained-release material is selected from natural ores rich in strontium element such as celestite, strontianite, strontium-rich aragonite, etc. or ores after purification and activation based on the natural ores, and the particle size is 0.5 - 2 mm.

[0017] According to the mineral element sustained-release material composition provided by the present invention, the mass ratio of the zinc sustained-release material to the strontium sustained-release material is 1:0.2 - 1:0.4.

[0018] In the second aspect, the present invention provides a preparation method of the above mineral element sustained-release material composition, including the step of mixing the zinc sustained-release material and the strontium sustained-release material.

[0019] Among them, the carrier skeleton, zinc oxide, phosphate and flux are mixed evenly, water is added to form wet powder materials, granulated to obtain granular materials with a diameter of 3 - 5 mm, and then dried, melted and calcined, cooled, and crushed to obtain granular zinc sustained-release materials.

[0020] According to the preparation method provided by the present invention, the temperature of the drying is 110 - 130 °C, and the temperature of the melting and calcination is controlled at 1500 - 1800 °C.

[0021] In the third aspect, the present invention provides the application of the above mineral element sustained-release material composition in purifying water, and the water includes static water and dynamic water.

[0022] According to the application provided by the present invention, when the water is static water, the mineral element sustained-release material composition is immersed in the static water.

[0023] According to the application provided by the present invention, the water is dynamic water. The mineral element sustained-release material composition is loaded into a filter element, and the dynamic water passes through the filter element at a flow rate of 2-4 L / min.

[0024] One or more of the above technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0025] The present invention provides a mineral element sustained-release material composition, a preparation method and an application thereof. By compounding a specific zinc sustained-release material and a strontium sustained-release material, high-concentration and stable zinc ion release under flowing water conditions can be achieved. The zinc ion concentration reaches 0.65 mg / L, effectively sterilizing.

[0026] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0027] Figure 1 It is a process schematic diagram for preparing the zinc sustained-release material in the embodiment of the present invention;

[0028] Figure 2 It is a microscopic morphology diagram of the zinc sustained-release material obtained in the embodiment of the present invention;

[0029] Figure 3 It is a physical diagram of the zinc sustained-release material obtained in the embodiment of the present invention. Detailed Embodiments

[0030] The following further describes in detail the embodiments of the present invention in conjunction with the embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0031] In the description of this specification, the description of reference terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0032] In the first aspect, the present invention provides a mineral element sustained-release material composition, including a zinc sustained-release material and a strontium sustained-release material. The zinc sustained-release material includes zinc polyphosphate loaded on a carrier skeleton. Based on the total mass of the zinc sustained-release material, the loading amount of the zinc polyphosphate is 55-75%.

[0033] When the concentration of zinc ions in water reaches 0.65 mg / L or more, it has an inhibitory and bactericidal effect on bacteria such as Staphylococcus aureus and Escherichia coli. Therefore, it is necessary to provide a slow-release material that can stably release zinc ions meeting the concentration requirements over time in an environment of static liquid immersion or dynamic liquid flowing / eroding, so as to achieve a long-term bactericidal effect.

[0034] In the prior art, zinc oxide is usually used as the zinc ion release source material. However, in fact, the release effect using zinc oxide as the release source material is very poor. To overcome this problem, in the prior art, there is a method of making zinc oxide into a zinc oxide nanorod coating. However, the process of preparing the zinc oxide nanorod coating is relatively complex, and in this way, the zinc ion release rate will be too fast. Therefore, it is necessary to partially convert zinc oxide into zinc phosphate to reduce the zinc ion release rate. See CN115501392A. Generally speaking, this method is too cumbersome.

[0035] The present invention has found through research that by breaking the conventional idea of using zinc oxide as the zinc ion release source material, using zinc polyphosphate loaded on the carrier skeleton as the zinc release source material and controlling the loading amount of zinc polyphosphate, high-concentration release of zinc ions can be achieved in a dynamic water flowing / eroding environment. However, when only using this zinc slow-release material alone, after a certain amount of water flow, the zinc ion concentration will quickly drop below 0.65 mg / L, that is, it cannot stably and continuously release high-concentration zinc ions. The present invention has further studied and unexpectedly found that by compounding this zinc slow-release material with a strontium slow-release material, high-concentration and stable zinc ion release can be achieved under flowing water conditions, and the zinc ion concentration reaches 0.65 mg / L, effectively sterilizing and making up for the lack of products in this aspect.

[0036] The carrier skeleton described in the present invention can be a conventional carrier providing a skeleton structure, such as a ceramic matrix, quartz sand, etc.

[0037] In some embodiments of the present invention, the carrier skeleton is quartz sand with a mesh size of 100-120. Quartz sand is quartz particles formed by crushing and processing quartz stone. Quartz stone is a non-metallic mineral, a hard, wear-resistant, and chemically stable silicate mineral. It has a variety of common specifications. The present invention selects quartz sand with a mesh size of 100-120, which is beneficial to its uniform heating.

[0038] In some embodiments of the present invention, the zinc slow-release material is granular with a particle size of 1-4 mm.

[0039] In some embodiments of the present invention, the zinc slow-release material is made from the following raw materials by weight:

[0040]

[0041]

[0042] Among them, the molar ratio of zinc element to phosphate ions should be controlled to be 1:0.5 - 1:0.8.

[0043] In some embodiments of the present invention, the phosphate is selected from one or more of sodium phosphate, disodium hydrogen phosphate, sodium dihydrogen phosphate, potassium phosphate, dipotassium hydrogen phosphate, potassium dihydrogen phosphate, calcium phosphate, calcium hydrogen phosphate, calcium dihydrogen phosphate, magnesium phosphate, magnesium hydrogen phosphate, and magnesium dihydrogen phosphate.

[0044] In some embodiments of the present invention, the phosphate is selected from one or more of calcium phosphate, calcium hydrogen phosphate, and calcium dihydrogen phosphate, more preferably calcium hydrogen phosphate and calcium dihydrogen phosphate, and they can be mixed in any proportion.

[0045] Among them, the phosphate reacts with zinc oxide to generate zinc polyphosphate. Controlling the amounts of each component within the above range can obtain a zinc slow-release material with a zinc polyphosphate loading that meets the requirements.

[0046] The role of the flux is to lower the melting temperature of the substance, thereby facilitating the melting calcination.

[0047] In some embodiments of the present invention, the flux is selected from one or more of boron oxide, calcium oxide, and phosphorus oxide, preferably boron oxide and calcium oxide, and they can be mixed in any proportion.

[0048] In some embodiments of the present invention, the strontium slow-release material is selected from natural ores rich in strontium elements such as celestite, strontianite, and strontium-rich aragonite, or ores obtained by purifying and activating the natural ores, and the particle size is 0.5 - 2 mm.

[0049] In some embodiments of the present invention, the mass ratio of the zinc slow-release material to the strontium slow-release material is 1:0.2 - 1:0.4.

[0050] Although the strontium slow-release material of the present invention is rich in strontium elements, when it is compounded with the zinc slow-release material, it can effectively promote the release of zinc ions and inhibit the release of strontium ions, making the concentration of zinc ions reach 0.65 mg / L, which is beyond the expectation of those skilled in the art.

[0051] In a second aspect, the present invention provides a method for preparing the above mineral element slow-release material composition, including the step of mixing the zinc slow-release material and the strontium slow-release material.

[0052] Among them, the carrier skeleton, zinc oxide, phosphate, and flux are mixed evenly, water is added to form a wet powder, granulated to obtain granular materials with a diameter of 3 - 5 mm, and then dried, melted and calcined, cooled, and crushed to obtain granular zinc slow-release materials.

[0053] In some embodiments of the present invention, the drying temperature is 110 - 130 °C. In one embodiment of the present invention, the drying temperature is 120 °C.

[0054] In some embodiments of the present invention, the temperature of the melting and calcination is controlled at 1500 - 1800 °C.

[0055] In a third aspect, the present invention provides the application of the above-mentioned mineral element sustained-release material composition in water purification, and the water includes static water and dynamic water.

[0056] The mineral element sustained-release material composition of the present invention can stably release more than 0.65 mg / L of zinc ions over time in an environment where it is soaked in static water or dynamic water flows through / scours, thereby achieving a long-term bactericidal effect.

[0057] When in the static water condition, directly soak the mineral element sustained-release material composition in static water. For every 1 ton of static water, about 20 g of the mineral element sustained-release material composition is used.

[0058] When in the dynamic water condition, load the mineral element sustained-release material composition into a filter element, and make the dynamic water pass through the filter element at a flow rate of 2 - 4 L / min. In the range where the dynamic water throughput is 10 t, the dosage of the mineral element sustained-release material composition is about 120 g.

[0059] The filter element of the present invention can select an existing commercially available filter element with a filtering function, as long as it is ensured that under the corresponding flow rate, the water flow can all pass through the filled filter material, and at the same time the filter material will not be washed out of the filter element.

[0060] It should be noted that the dynamic water in the present invention is at room temperature. If dynamic water with a certain temperature needs to be used, it can be heated after purification.

[0061] Specific embodiments will be introduced below.

[0062] In the following examples, unless otherwise specified, the materials used can be obtained through regular commercial channels.

[0063] In the following examples, the particle size of the quartz sand used is 100 - 120 mesh; zinc oxide is a common commercially available white powder; and the raw materials used in the present invention are all commercially available food grades.

[0064] Example 1

[0065] This example provides a mineral element sustained-release material composition, which is composed of a zinc sustained-release material and a strontium sustained-release material (natural celestine, particle size 0.5 - 2 mm) mixed in a mass ratio of 1:0.2.

[0066] Among them, the raw materials for preparing the zinc sustained-release material are the following components in parts by mass:

[0067]

[0068] Mix the above materials evenly, add a small amount of water to prepare wet powder materials, granulate to form granular materials with a diameter of 3 - 5 mm, dry at 120 °C, transfer to a kiln furnace, heat to 1500 °C for melting and calcination, keep warm for 4 h, cool and then crush and screen, take particles with a diameter of 1 - 4 mm, and obtain granular zinc sustained-release materials after air shower dust removal. The preparation process is as Figure 1 shown. Figure 2 This is the microscopic morphology diagram of the zinc sustained-release materials obtained in the embodiment of the present invention; Figure 3 This is the physical diagram of the zinc sustained-release materials obtained in the embodiment of the present invention.

[0069] Take 120 g of the mineral element sustained-release material composition obtained in this embodiment (where the zinc sustained-release material in this embodiment is 100 g) and load it into a filter element. Another 120 g of the zinc sustained-release material alone in this embodiment is loaded into a filter element. At room temperature, make tap water pass through the filter element at a flow rate of 4 L / min, and detect the zinc content in the filtered liquid of the filter element according to the method of GB / T 5750.6 - 2023. The test results are shown in Table 1.

[0070] Table 1

[0071]

[0072] The test results show that after the zinc sustained-release material is compounded with the strontium sustained-release material, the sustained-release concentration of zinc ions is significantly increased and relatively stable. The minimum bactericidal concentration of 0.65 mg / L can still be reached after 10 t of water passing through, and it has good commercial value.

[0073] Example 2

[0074] This embodiment provides a mineral element sustained-release material composition, which is composed of a zinc sustained-release material and a strontium sustained-release material (strontianite ore, particle size 0.5 - 2 mm) mixed in a mass ratio of 1:0.3.

[0075] Among them, the preparation raw materials of the zinc sustained-release material are the following components in parts by mass:

[0076]

[0077] Mix the above materials evenly, add a small amount of water to prepare wet powder materials, granulate to form granular materials with a diameter of 3 - 5 mm, dry at 120 °C, transfer to a kiln furnace, heat to 1600 °C for melting and calcination, keep warm for 3 h, cool and then crush and screen, take particles with a diameter of 1 - 4 mm.

[0078] Take 120 g of the mineral element sustained-release material composition obtained in this example (where the zinc sustained-release material in this example is about 92.3 g) and load it into the filter element. Take another 120 g of the zinc sustained-release material alone in this example and load it into the filter element. At room temperature, let tap water pass through the filter element at a flow rate of 3 L / min, and detect the zinc content in the liquid flowing through the filter element according to the method of GB / T 5750.6-2023. The test results are shown in Table 2.

[0079] Table 2

[0080]

[0081] The test results show that when 120 g of the mineral element sustained-release material composition is at a flow rate of 3 L / min, the minimum bactericidal concentration of 0.65 mg / L can still be achieved after the water passing through the filter element reaches 10 t.

[0082] Example 3

[0083] This example provides a mineral element sustained-release material composition, which is formed by mixing a zinc sustained-release material and a strontium sustained-release material (natural celestine, particle size 0.5-2 mm) with a mass ratio of 1:0.4.

[0084] Among them, the raw materials for preparing the zinc sustained-release material are the following components in parts by mass:

[0085]

[0086] Mix the above materials evenly, add a small amount of water to prepare wet powder materials, granulate them to form granular materials with a diameter of 3-5 mm, dry them at 120 °C, transfer them to a kiln furnace and heat them to 1800 °C for melting and calcination, keep warm for 2 h, cool and then crush and screen them, take particles with a diameter of 1-4 mm, and obtain granular zinc sustained-release material after air shower dust removal.

[0087] Take 120 g of the mineral element sustained-release material composition obtained in this example (where the zinc sustained-release material in this example is about 85.7 g) and load it into the filter element. Take another 120 g of the zinc sustained-release material alone in this example and load it into the filter element. At room temperature, let tap water pass through the filter element at a flow rate of 2 L / min, and detect the zinc content in the liquid flowing through the filter element according to the method of GB / T 5750.6-2023. The test results are shown in Table 3.

[0088] Table 3

[0089]

[0090] The test results show that when 120 g of the mineral element sustained-release material composition is at a flow rate of 2 L / min, the minimum bactericidal concentration of 0.65 mg / L can still be achieved after the water passing through the filter element reaches 10 t.

[0091] Comparative Example 1

[0092] This comparative example provides a commercially available zinc-rich slow-release material. Take 120 g of the commercially available zinc-rich slow-release material of this comparative example and load it into the filter element. At room temperature, let tap water pass through the filter element at a flow rate of 2 L / min. According to the method of GB / T 5750.6-2023, detect the zinc content in the filtered liquid of the filter element. The test results are shown in Table 4.

[0093] In addition, take 100 g of the commercially available zinc-rich slow-release material of this comparative example and mix it with 20 g of the strontium slow-release material in Example 1, then load them into the filter element. At room temperature, let tap water pass through the filter element at a flow rate of 2 L / min. According to the method of GB / T 5750.6-2023, detect the zinc content in the filtered liquid of the filter element. The test results are shown in Table 4.

[0094] Table 4

[0095]

[0096]

[0097] It can be seen that the zinc ion concentration of this commercially available zinc-rich slow-release material only reaches above 0.65 mg / L in the initial water passing stage. After passing 4 t of water, its zinc ion slow-release concentration is only 0.015 mg / L, and no zinc ions are released after passing 6 t of water. Obviously, it cannot achieve a good bactericidal effect. The effect is not ideal after being compounded with the strontium slow-release material.

[0098] Comparative Example 2

[0099] This comparative example provides the antibacterial composite material disclosed in CN114685185A, and its preparation method is as follows:

[0100] (1) Prepare the ceramic matrix: Refer to steps S702, S704, and S706.

[0101] (2) Prepare the soluble antibacterial glass melt: Weigh the raw materials according to the mass ratio of zinc oxide: boron oxide: calcium oxide: phosphorus oxide = 10:20:30:40 and mix the raw materials to obtain a mixture; melt the mixture to obtain the soluble antibacterial glass melt. Refer to steps S302 and S304.

[0102] (3) Coat the antibacterial glass melt on the surface of the ceramic core, refer to step S106. Finally, the mass proportion of zinc oxide in the whole antibacterial composite material is 10%.

[0103] Take 120 g of the antibacterial composite material of this comparative example and load it into the filter element. At room temperature, let tap water pass through the filter element at a flow rate of 2 L / min. According to the method of GB / T 5750.6-2023, detect the zinc content in the filtered liquid of the filter element. The test results are shown in Table 5.

[0104] In addition, 100 g of the antibacterial composite material of this comparative example and 20 g of the strontium slow-release material in Example 1 were mixed and loaded into the filter element. Tap water was passed through the filter element at a flow rate of 2 L / min at room temperature. The zinc content in the liquid flowing through the filter element was detected according to the method of GB / T 5750.6-2023. The test results are shown in Table 5.

[0105] Table 5

[0106] Water passing capacity of filter element (t) Antibacterial composite material (mg / L) Compound with strontium slow-release material (mg / L) 0 (initial) 0.330 0.384 2 0.124 0.145 4 0.017 0.032 6 0 0 8 0 0 10 0 0

[0107] Comparative Example 3

[0108] In this comparative example, 200 g of the antibacterial material of Comparative Example 2 was loaded into the filter element. Tap water was passed through the filter element at a flow rate of 2 L / min at room temperature. The zinc content in the liquid flowing through the filter element was detected according to the method of GB / T 5750.6-2023. The test results are shown in Table 6.

[0109] In addition, 200 g of the antibacterial composite material of this comparative example and 20 g of the strontium slow-release material in Example 1 were mixed and loaded into the filter element. Tap water was passed through the filter element at a flow rate of 2 L / min at room temperature. The zinc content in the liquid flowing through the filter element was detected according to the method of GB / T 5750.6-2023. The test results are shown in Table 6.

[0110] Table 6

[0111] Water passing capacity of filter element (t) Antibacterial composite material (mg / L) Compound with strontium slow-release material (mg / L) 0 (initial) 0.545 0.549 2 0.271 0.285 4 0.058 0.067 6 0.012 0.014 8 0 0 10 0 0

[0112] Comparative Example 4

[0113] This comparative example provides an antibacterial phosphate glass body. Prepare raw materials (calculated by weight): 23.26 parts of boric acid, 65.97 parts of sodium dihydrogen phosphate, 0.89 part of copper oxide, 1.05 parts of silver oxide, 2.0 parts of tetrapod-like zinc oxide whiskers, and 6.83 parts of calcium oxide. Mix them evenly and pass through a 60-mesh standard sieve to obtain a mixture. Place the mixture in a quartz crucible and heat it to 900 °C at a rate of 7 °C / min, hold for 50 min, and carry out a melting and polymerization reaction to obtain a glass melt, that is, a melt. Pour the glass melt into a self-made mold for shaping and cool it to obtain the antibacterial phosphate glass body. Pour the antibacterial phosphate glass body into a ball mill, add stainless steel balls (or porcelain balls) stirrers, set the rotation speed at 45 revolutions / min, and carry out grinding for about 30 min. Remove burrs and rough edges by means of the friction and impact of the glass body particles themselves. After grinding, pass through a 40-mesh standard sieve to obtain the finished glass body.

[0114] Take 120 g of the antibacterial phosphate glass body of this comparative example and load it into the filter element. Tap water was passed through the filter element at a flow rate of 2 L / min at room temperature. The zinc content in the liquid flowing through the filter element was detected according to the method of GB / T 5750.6-2023. The test results are shown in Table 8.

[0115] In addition, 100 g of the antibacterial phosphate glass body of this comparative example and 20 g of the strontium slow-release material in Example 1 were mixed and loaded into a filter element. Tap water was passed through the filter element at a flow rate of 2 L / min at room temperature, and the zinc content in the liquid flowing through the filter element was detected according to the method of GB / T5750.6-2023. The test results are shown in Table 7.

[0116] Table 7

[0117]

[0118]

[0119] It can be seen from the above results that the materials of Comparative Examples 2-4 also cannot meet the requirement of stable zinc ion release and cannot achieve good bactericidal effect within a water passing volume of 10 t.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and should be covered by the scope of the claims of the present invention.

Claims

1. A mineral element sustained-release material composition, characterized in that, it comprises a zinc sustained-release material and a strontium sustained-release material, and the zinc sustained-release material comprises zinc polyphosphate loaded on a carrier skeleton. Based on the total mass of the zinc sustained-release material, the loading amount of zinc polyphosphate is 55-70%.

2. The mineral element sustained-release material composition according to claim 1, characterized in that, the carrier skeleton is quartz sand with a mesh size of 100-120; the zinc sustained-release material is granular, with a particle size of 1-4 mm.

3. The mineral element sustained-release material composition according to claim 2, characterized in that, the zinc sustained-release material is made from the following raw materials by weight, quartz sand 22-32 parts zinc oxide 28-40 parts phosphate 20-55 parts flux 8-12 parts, wherein, the molar ratio of zinc element to phosphate ion should be controlled at 1:0.5-1:0.

8.

4. The mineral element sustained-release material composition according to claim 3, characterized in that, the phosphate is selected from one or more of sodium phosphate, disodium hydrogen phosphate, sodium dihydrogen phosphate, potassium phosphate, dipotassium hydrogen phosphate, potassium dihydrogen phosphate, calcium phosphate, calcium hydrogen phosphate, calcium dihydrogen phosphate, magnesium phosphate, magnesium hydrogen phosphate, magnesium dihydrogen phosphate; preferably one or more of calcium phosphate, calcium hydrogen phosphate, calcium dihydrogen phosphate, more preferably calcium hydrogen phosphate and calcium dihydrogen phosphate; the flux is selected from one or more of boron oxide, calcium oxide, phosphorus oxide, preferably boron oxide and calcium oxide.

5. The mineral element sustained-release material composition according to claim 1, characterized in that, the strontium sustained-release material is selected from one or more of celestite, strontianite, strontium-rich aragonite, with a particle size of 0.5-2 mm.

6. The mineral element sustained-release material composition according to any one of claims 1-5, characterized in that, the mass ratio of the zinc sustained-release material to the strontium sustained-release material is 1:0.2-1:0.

4.

7. The preparation method of the mineral element sustained-release material composition according to any one of claims 1-6, characterized in that, it includes the step of mixing the zinc sustained-release material and the strontium sustained-release material; wherein, the carrier skeleton, zinc oxide, phosphate and flux are mixed evenly, water is added to form a wet powder material, granulated to obtain a granular material with a diameter of 3-5 mm, and then dried, melt-calcined, cooled and crushed to obtain a granular zinc sustained-release material.

8. The preparation method according to claim 7, characterized in that, the drying temperature is 110-130 °C, and the melt-calcination temperature is controlled at 1500-1800 °C.

9. The application of the mineral element sustained-release material composition according to any one of claims 1-6 in purifying water, characterized in that, the water includes static water and dynamic water.

10. The application according to claim 9, characterized in that, when the water is static water, the mineral element sustained-release material composition is immersed in the static water; or, when the water is dynamic water, the mineral element sustained-release material composition is loaded into a filter element, and the dynamic water passes through the filter element at a flow rate of 2-4 L / min.

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