Magnesium-containing mineralized filter material, mineralized filter element and preparation method thereof

Abstract

The invention relates to the technical field of mineralized filter elements, particularly provides a magnesium-containing mineralized filter material, a mineralized filter element and a preparation method of the mineralized filter element, and aims at solving the problem that the service life of the magnesium mineralized filter element is shortened due to the fact that the magnesium ion release speed of the existing magnesium mineralized filter element is too high. The magnesium-containing mineralized filter material comprises modified magnesium ore and modified dolomite, wherein the mass ratio of the modified magnesium ore to the modified dolomite is (0.25-6): 1. By controlling the ratio of the modified magnesium ore to the modified dolomite, the precipitation concentration and speed of magnesium ions in water can be controlled, so that the concentration of the magnesium ions in the water can meet user requirements, and the service life of a magnesium mineralization filter element can be prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of mineralized filter materials, and specifically provides a magnesium-containing mineralized filter material, a mineralized filter element and a preparation method thereof. Background Art

[0002] Magnesium is an essential element for the human body. It can activate various enzymes, regulate the body's hormone levels, play an important role in human immunity, be an essential element for cell structure and function, have beneficial effects on promoting bone growth, maintaining nervous system health, relieving stress, and combating anxiety. At the same time, magnesium can also stimulate the aroma of coffee and tea and improve the taste. Therefore, water purification devices containing magnesium mineralized filter elements are widely popular among the public.

[0003] However, due to the rough preparation process of the magnesium mineralized filter element on the market, the precipitation concentration of magnesium ions in the magnesium mineralized filter element during use is too high, resulting in too fast a release rate of magnesium ions from the magnesium mineralized filter element, and thus reducing the service life of the magnesium mineralized filter element. Users need to frequently replace the magnesium mineralized filter element, which increases the use cost and reduces the user experience. Therefore, how to optimize the preparation process of the magnesium mineralized filter element so that it can precipitate magnesium ions at a reasonable concentration has become an urgent technical problem in this field.

[0004] In view of this, there is a need in this field for a magnesium-containing mineralized filter material, a mineralized filter element and a preparation method thereof to solve the above problems. Summary of the Invention

[0005] The present invention aims to solve the above technical problems, that is, to solve the problem that the release rate of magnesium ions from the existing magnesium mineralized filter element is too fast, thereby reducing the service life of the magnesium mineralized filter element.

[0006] In a first aspect, the present invention provides a magnesium-containing mineralized filter material; the magnesium-containing mineralized filter material includes modified magnesite and modified dolomite, and the mass ratio of the modified magnesite to the modified dolomite is modified magnesite:modified dolomite = (0.25 - 6):1.

[0007] In a preferred technical solution of the above magnesium-containing mineralized filter material, the mass ratio of the modified magnesite to the modified dolomite is modified magnesite:modified dolomite = (1 - 1.5):1;

[0008] and / or, the modified magnesite is obtained through the following steps:

[0009] Calcine natural magnesite at a first temperature for a first preset time, wash, dry and crush it to 20 - 200 meshes to obtain modified magnesite.

[0010] In a preferred technical solution of the above magnesium-containing mineralized filter material, the first temperature is 700 - 800 °C;

[0011] And / or, the first preset time is 1 to 2 h.

[0012] In the preferred technical solution of the above magnesium-containing mineralized filter material, the modified dolomite is prepared by the following steps:

[0013] S1: Calcinate natural dolomite at a second temperature for a second preset time, wash, dry, and crush it to 20 to 200 mesh to obtain transitional dolomite;

[0014] S2: Soak the transitional dolomite with a phosphoric acid solution for modification, and add an alkali solution during the soaking process to adjust the pH to be in an alkaline range and continuously stir;

[0015] S3: Wash and dry the dolomite obtained in step S2 to obtain modified dolomite.

[0016] In the preferred technical solution of the above magnesium-containing mineralized filter material, in step S1, the second temperature is 900 to 1000 °C;

[0017] And / or, in step S1, the second preset time is 1 to 2 h;

[0018] And / or, in step S2, the soaking temperature is 60 to 80 °C;

[0019] And / or, in step S2, the soaking time is 2 to 4 h;

[0020] And / or, in step S2, the concentration of the phosphoric acid solution is 1 to 10%;

[0021] And / or, in step S2, the alkali solution is a sodium hydroxide solution, and the pH value of the alkali solution range is 9 to 12.

[0022] In a second aspect, the present invention provides a mineralized filter element; the mineralized filter element includes the following components by weight: 10 to 50 parts of magnesium-containing mineralized filter material, 12 to 45 parts of binder, and 100 to 500 parts of modified activated carbon, and the magnesium-containing mineralized filter material is the magnesium-containing mineralized filter material according to any one of claims 1 to 5.

[0023] In the preferred technical solution of the above mineralized filter element, the binder includes a high molecular weight PE powder with a molecular weight of 1 to 5 million and an ultra-high molecular weight PE powder with a molecular weight of 5 to 8 million, and the mass ratio of the high molecular weight PE powder to the ultra-high molecular weight PE powder is (10 to 35):(2 to 10).

[0024] In the preferred technical solution of the above mineralized filter element, the modified activated carbon is prepared by the following steps:

[0025] S10: Wash coconut shell activated carbon, mix it with hydrochloric acid or sulfuric acid, and heat for reaction to obtain transitional activated carbon;

[0026] S20: Wash the transitional activated carbon until the pH is 6 - 8 and the drained water is free of black color.

[0027] S30: Dry the washed activated carbon to obtain the modified activated carbon.

[0028] In the preferred technical solution of the above - mentioned mineralized filter element, in step S10, the concentration of the hydrochloric acid or the sulfuric acid is 5 - 10%;

[0029] And / or, in step S10, the heating temperature is 60 - 80°C;

[0030] And / or, in step S10, continuous stirring is carried out during the reaction, and the reaction time is 1 - 3 h;

[0031] And / or, in step S30, the water content of the modified activated carbon is less than 10%.

[0032] In the third aspect, the present invention provides a preparation method of a mineralized filter element; the preparation method of the mineralized filter element is used to prepare the mineralized filter element in the above - mentioned technical solution;

[0033] The preparation method includes the following steps:

[0034] S100: Mix the magnesium - containing mineralized filter material, binder, and modified activated carbon to form a mixture;

[0035] S200: Extrude the mixture using an independent twin - screw extruder to obtain a carbon rod;

[0036] S300: Cut the carbon rod into a carbon core;

[0037] S400: Assemble the carbon core into a mineralized filter element;

[0038] Preferably, "extrude the mixture using an independent twin - screw extruder to obtain a carbon rod" includes:

[0039] During the extrusion process, the extrusion temperature of the first - stage screw of the independent twin - screw extruder is 80 - 100°C, and the extrusion temperature of the second - stage screw is 200 - 230°C.

[0040] In the case of adopting the above - mentioned technical solution, by controlling the mixing ratio of the modified magnesite and the modified dolomite, it can be ensured that when the magnesium - containing mineralized filter material is applied to the mineralized filter element, the magnesium in the mineralized filter material is stably released, avoiding too high magnesium content in the water during the initial use, and improving the magnesium ion release life of the mineralized filter element and prolonging the service life of the mineralized filter element.

[0041] After calcining natural magnesite, most of the magnesium carbonate is converted into magnesium oxide. After making a mineralized filter element, it can provide sufficient magnesium elements. After calcining natural dolomite and soaking it in phosphoric acid solution, hydroxyapatite is formed on its surface, thus forming a calcium-phosphorus deposition layer. The calcium-phosphorus deposition layer partially covers the magnesium oxide, which can reduce the release rate and concentration of magnesium ions. Therefore, after preparing the mineralized filter element, the uniformity of magnesium ion release from the mineralized filter element can be improved, and the service life of the mineralized filter element can be extended.

[0042] In addition, the magnesium-containing mineralized filter material is obtained by modifying natural magnesite and natural dolomite as raw materials. Its raw materials are safe, and the preparation process is safe and environmentally friendly. Moreover, its particle size is 20-200 mesh, and the particle size is small, which can reduce the volume of the prepared mineralized filter element, improve the application scenarios of the magnesium-containing mineralized filter material, and is suitable for the preparation of mineralized filter elements of different specifications. Specific embodiments

[0043] The following describes the preferred embodiments of the present invention. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention. Those skilled in the art can adjust it according to needs to adapt to specific application scenarios.

[0044] In order to solve the problem that the release rate of magnesium ions of the existing magnesium mineralized filter element is too fast, thereby reducing the service life of the magnesium mineralized filter element.

[0045] This application provides a magnesium-containing mineralized filter material, which includes modified magnesite and modified dolomite. When applied to a mineralized filter element, it can make the magnesium in the ore slowly release, improve the precipitation concentration and rate of magnesium ions in water, so that the magnesium ions in water can not only meet the needs of users, but also effectively extend the service life of the mineralized filter element.

[0046] In the first aspect, the present invention provides a magnesium-containing mineralized filter material, which includes modified magnesite and modified dolomite, and the mass ratio of modified magnesite to modified dolomite is modified magnesite:modified dolomite=(0.25-6):1.

[0047] In the magnesium-containing mineralized filter material of this application, by controlling the mixing ratio of modified magnesite and modified dolomite, it can ensure that when the magnesium-containing mineralized filter material is applied to a mineralized filter element, the magnesium in the mineralized filter material is stably released, avoid too high magnesium content in water during the initial use, and improve the magnesium ion release life of the mineralized filter element, thereby extending the service life of the mineralized filter element.

[0048] Preferably, the mass ratio of modified magnesite to modified dolomite is modified magnesite:modified dolomite=(1-1.5):1.

[0049] Preferably, the modified magnesite ore is prepared by the following steps:

[0050] Calcine natural magnesite ore at a first temperature for a first preset time, wash, dry, and crush it to 20 - 200 mesh to obtain the modified magnesite ore.

[0051] Preferably, the first temperature is 700 - 800 °C.

[0052] Preferably, the first preset time is 1 - 2 h.

[0053] By calcining natural magnesite ore, most of the magnesium carbonate can be converted into magnesium oxide, so that sufficient magnesium elements can be provided to users after the mineralized filter element is prepared.

[0054] Preferably, the modified dolomite is prepared by the following steps:

[0055] S1: Calcine natural dolomite at a second temperature for a second preset time, wash, dry, and crush it to 20 - 200 mesh to obtain the transitional dolomite.

[0056] S2: Immerse the transitional dolomite in a phosphoric acid solution for modification, and add an alkali solution during the immersion process to adjust the pH to be in the alkaline range and continuously stir.

[0057] S3: Wash and dry the dolomite obtained in step S2 to obtain the modified dolomite.

[0058] Preferably, in step S1, the second temperature is 900 - 1000 °C.

[0059] Preferably, in step S1, the second preset time is 1 - 2 h.

[0060] Preferably, in step S2, the immersion temperature is 60 - 80 °C.

[0061] Preferably, in step S2, the concentration of the phosphoric acid solution is 1 - 10%.

[0062] Preferably, in step S2, the alkali solution is sodium hydroxide solution, and the pH value in the alkaline range is 9 - 12.

[0063] By calcining natural dolomite and then immersing it in a phosphoric acid solution, and adding sodium hydroxide solution during the immersion process to make the reaction reach alkaline conditions, hydroxyapatite is formed on the surface of natural dolomite, thus forming a calcium - phosphorus deposition layer. The calcium - phosphorus deposition layer partially covers the magnesium oxide, which can reduce the release rate and concentration of magnesium ions. Therefore, after the mineralized filter element is prepared, the uniformity of magnesium ion release from the mineralized filter element can be improved, and the service life of the mineralized filter element can be extended.

[0064] In addition, the magnesium-containing mineralized filter material of the present application is obtained by modifying natural magnesite and natural dolomite as raw materials. Its raw materials are safe, the preparation process is safe and environmentally friendly, and its particle size is 20 - 200 mesh. The particle size is relatively small, which can reduce the volume of the prepared mineralized filter element, expand the application scenarios of the magnesium-containing mineralized filter material, and is suitable for the preparation of mineralized filter elements of different specifications.

[0065] In a second aspect, the present invention provides a mineralized filter element, which comprises the following components by weight: 10 - 50 parts of magnesium-containing mineralized filter material, 12 - 45 parts of binder, and 100 - 500 parts of modified activated carbon. Among them, the magnesium-containing mineralized filter material is the magnesium-containing mineralized filter material provided in the first aspect of the present invention.

[0066] Preferably, the binder includes high molecular weight PE powder with a molecular weight of 1 million - 5 million and ultra-high molecular weight PE powder with a molecular weight of 5 million - 8 million, and the mass ratio of high molecular weight PE powder to ultra-high molecular weight PE powder is (10 - 35):(2 - 10).

[0067] By controlling the mass ratio of high molecular weight PE powder to ultra-high molecular weight PE powder, the filtration pores of the mineralized filter element can be controlled, thereby controlling the contact area between water and the mineralized filter material and activated carbon powder, further controlling the release rate of magnesium ions and the adsorption effect of activated carbon. At the same time, the mineralized filter element can have better strength and durability, and extend the service life of the mineralized filter element.

[0068] Preferably, the modified activated carbon is prepared by the following steps:

[0069] S10: After cleaning the coconut shell activated carbon, it is mixed with hydrochloric acid or sulfuric acid and heated for reaction to obtain transitional activated carbon.

[0070] S20: Wash the transitional activated carbon until the pH is 6 - 8 and the drained water is colorless black.

[0071] S30: Dry the washed activated carbon to obtain modified activated carbon.

[0072] Preferably, in step S10, the concentration of hydrochloric acid or sulfuric acid is 5 - 10%.

[0073] Preferably, in step S10, the heating temperature is 60 - 80 °C.

[0074] Preferably, in step S10, continuous stirring is carried out during the reaction, and the reaction time is 1 - 3 h.

[0075] Preferably, in step S30, the water content of the modified activated carbon is less than 10%.

[0076] In a third aspect, the present invention provides a method for preparing a mineralized filter element, which specifically includes the following steps:

[0077] S100: Mix the magnesium-containing mineralized filter material, binder, and modified activated carbon to form a mixture.

[0078] S200: Extrude the mixture using an independent twin-screw extruder to obtain carbon rods. Since the independent twin-screw extruder is a commonly used extrusion device in this field, its specific structure will not be elaborated here.

[0079] S300: Cut the carbon rods into carbon cores.

[0080] S400: Assemble the carbon cores into mineralized filter elements.

[0081] Preferably, in step S200, during the extrusion process, the extrusion temperature of the first-stage screw of the independent twin-screw extruder is 80 - 100 °C, and the extrusion temperature of the second-stage screw is 200 - 230 °C.

[0082] During the preparation process, control the extrusion temperature of the first-stage screw to be 80 - 100 °C to plasticize the pickled activated carbon powder and the binder, and dry the moisture in the raw material to be processed, so that the raw material to be processed is not prone to caking. Control the extrusion temperature of the second-stage screw to be 200 - 230 °C, so that the binder melts into a flowing state, bond the composite ore powder and the pickled activated carbon powder together, and form and extrude the carbon core.

[0083] Specifically, the following several specific examples of mineralized filter elements are used to illustrate the magnesium-containing mineralized filter material and the mineralized filter element of the present application in detail.

[0084] Example 1

[0085] The formula of the mineralized filter element in this example is as follows:

[0086] 30 parts of magnesium-containing mineralized filter material, 30 parts of binder, and 100 parts of modified activated carbon.

[0087] Among them, the mass ratio of the modified magnesium ore to the modified dolomite in the magnesium-containing mineralized filter material is 1:1, and the mass ratio of the high molecular weight PE powder to the ultra-high molecular weight PE powder in the binder is 25:5.

[0088] The modified magnesium ore in this example is prepared through the following steps:

[0089] S1: Crush the natural magnesite into particles with a size of 0.5 - 5 mm, preferably 2 mm. By crushing the natural magnesite, the specific surface area of the natural magnesite can be increased, which is more conducive to thermal decomposition into magnesium oxide.

[0090] S2: Calcinate the natural magnesite obtained in step S1 at 750 °C for 1 hour, wash it with pure water until the turbidity is less than 1 NTU (nephelometric turbidity unit) to remove the impurities generated on the surface during the calcination process, and then dry and crush it to 20 - 200 mesh to obtain the modified magnesium ore.

[0091] The modified dolomite of this embodiment is prepared through the following steps:

[0092] S1: Crush natural dolomite into particles with a size of 0.5 - 5 mm, preferably 2 mm. By crushing natural dolomite, the specific surface area of natural dolomite can be increased, which is more conducive to thermal decomposition into a mixture of magnesium oxide and calcium oxide.

[0093] S2: Calcinate natural dolomite at 950 °C for 1 hour, wash it with pure water until the turbidity is less than 1 NTU to remove the impurities generated on the surface during the calcination process, and then dry and crush it to 20 - 200 meshes to obtain transitional dolomite.

[0094] S3: Immerse the transitional dolomite in a phosphoric acid solution for modification. During the immersion process, add a sodium hydroxide solution and continuously stir to make the reaction solution more uniform, avoid local over-alkalinity, and promote the formation of hydroxyapatite. Among them, the concentration of the phosphoric acid solution is 5%, the immersion temperature is 70 °C, the immersion time is 3 hours, the concentration of the sodium hydroxide solution is 1%, and the sodium hydroxide solution is added during the immersion process to control the pH of the reaction solution to 11, that is, to make the reaction proceed under alkaline conditions. During the reaction process, the hydroxide ions in sodium hydroxide can neutralize the hydrogen ions in phosphoric acid to generate phosphate ions and water, and at the same time increase the pH of the reaction solution. Under alkaline conditions, calcium ions and phosphate ions combine to finally form hydroxyapatite.

[0095] S4: Wash and dry the dolomite obtained in step S3 with pure water to obtain modified dolomite.

[0096] The modified activated carbon of this embodiment is prepared through the following steps:

[0097] S1: Select coconut shell activated carbon powder with a mesh size of 80 - 200, and wash it with clean water to remove the ash and large particle impurities on the surface of the coconut shell activated carbon powder.

[0098] S2: After washing the coconut shell activated carbon, mix it with hydrochloric acid with a concentration of 7% and heat it to 70 °C for reaction for 2 hours to obtain transitional activated carbon. By pickling the coconut shell activated carbon powder with hydrochloric acid, the impurities and heavy metals of the coconut shell activated carbon powder can be further removed, and the dust and ash on the surface layer and pores of the activated carbon can be reduced, thereby improving the safety, adsorption performance and service life of the product.

[0099] S3: Wash the transitional activated carbon until the pH is 7 and the drained water is not black. Whether the drained water is black is judged manually.

[0100] S4: Dry the coconut shell activated carbon powder obtained in step S3 until the water content is 9% to obtain modified activated carbon.

[0101] The mineralized filter element of this embodiment is prepared through the following steps:

[0102] S100: Mix the magnesium-containing mineralized filter material, binder, and modified activated carbon to form a mixture. Among them, there are 30 parts of magnesium-containing mineralized filter material, 30 parts of binder, and 100 parts of modified activated carbon; the mass ratio of modified magnesite to modified dolomite in the magnesium-containing mineralized filter material is 1:1, and the mass ratio of high molecular weight PE powder to ultra-high molecular weight PE powder in the binder is 25:5.

[0103] S200: Feed the mixture into an independent twin-screw extruder. Control the temperature of the first-stage screw at 90°C to plasticize the pickled activated carbon powder and the binder, and dry the moisture in the raw material to be processed to prevent the raw material from caking; control the temperature of the second-stage screw at 220°C so that the binder melts into a flowing state, bond the composite ore powder and the pickled activated carbon powder together, and form and extrude the carbon core.

[0104] S300: Cut the carbon rod into a carbon core with a length of 68 mm and an outer diameter of 53 mm.

[0105] S400: Assemble the carbon core with the end cap and O-ring to form a mineralized filter element.

[0106] Comparative Example 1

[0107] The formula of the mineralized filter element of Comparative Example 1 is as follows: 30 parts of magnesium-containing mineralized filter material, 30 parts of binder, and 300 parts of modified activated carbon. The magnesium-containing mineralized filter material includes modified magnesite and modified dolomite, and the mass ratio of modified magnesite to modified dolomite is 1:1. Among them, the modified magnesite is obtained by calcining natural magnesite at 750°C for 1 hour, washing it with pure water until the turbidity is less than 1 NTU, and then drying and crushing it to 20 - 200 meshes; the modified dolomite is obtained by calcining natural dolomite at 950°C for 1 hour, washing it with pure water until the turbidity is less than 1 NTU, and then drying and crushing it to 20 - 200 meshes. The mass ratio of high molecular weight PE powder to ultra-high molecular weight PE powder in the binder is 25:5.

[0108] Test Example 1

[0109] Install the mineralized filter elements of Example 1 and Comparative Example 1 at the water outlet end of the water purifier for use, and detect the magnesium ion precipitation concentration in the effluent. Specifically, detect the magnesium ion concentration when the water passing through is 0 L, 1000 L, 2000 L, 3000 L, and 4000 L respectively. The detection data is shown in Table 1.

[0110] Table 1 Detection data table of the mineralized filter elements of Example 1 and the comparative example

[0111] As can be seen from the data in Table 1: Compared with the mineralized filter element in Comparative Example 1, the mineralized filter element in Example 1 can reduce the magnesium ion concentration in water from 9.89 mg / L to 6.93 mg / L when first used, avoiding excessive magnesium content in water when first used. And as the water passing volume increases, the mineralized filter element in Example 1 can still maintain a stable release of magnesium ions. When the water passing volume reaches 4000 L, the magnesium ion concentration in water is still 0.256 mg / L, enabling the magnesium ions in water to meet the needs of users and effectively extending the service life of the mineralized filter element. Thus, it can be known that the mineralized filter element of the present application can both avoid excessive magnesium content in water when first used and effectively improve the release life of magnesium ions.

[0112] Test Example 2

[0113] This test example is used to verify the influence of different component ratios in the mineralized filter element on the precipitation concentration of magnesium ions. Among them, the difference between Examples 2 to 7 and Example 1 lies only in the component ratios of each component in the mineralized filter element. The specific ratios are shown in Table 2, and the precipitation concentrations of magnesium ions in the corresponding examples are shown in Table 3.

[0114] Table 2 Component Ratio Table of Mineralized Filter Elements in Examples 2 to 7 Project Magnesium-containing mineralized filter media Binder Modified activated carbon Example 1 30 parts 30 parts 300 parts Example 2 10 parts 30 parts 300 parts Example 3 5 parts 30 parts 300 parts Example 4 60 parts 30 parts 300 parts Example 5 10 parts 12 parts 100 parts Example 6 50 parts 45 parts 500 parts Example 7 50 parts 12 parts 100 parts

[0115] Table 3 Detection Data Table of Mineralized Filter Elements in Examples 2 to 7

[0116] As can be seen from the data in Table 3: From Examples 1 to 4, it can be known that the more the number of parts of the magnesium-containing mineralized filter material in the mineralized filter element, the higher the content of magnesium ions in water and the longer the service life of the mineralized filter element. However, when the number of parts of the magnesium-containing mineralized filter material is too small, as in Example 3, as the use time of the mineralized filter element increases, the concentration of magnesium ions in water is too low. When the water passing volume reaches 4000 L, the magnesium ion concentration in water is only 0.05 mg / L, which cannot meet the needs of users and requires the replacement of the mineralized filter element, resulting in a shorter service life of the mineralized filter element. When the number of parts of the magnesium-containing mineralized filter material is too large, as in Example 4, the magnesium ion concentration in water can reach 10.88 mg / L when first used, and the magnesium content in water is too high. Therefore, by controlling the number of parts of the magnesium-containing mineralized filter material in the mineralized filter element, the precipitation concentration and rate of magnesium ions in water can be controlled, enabling the magnesium ions in water to meet the needs of users and effectively extending the service life of the mineralized filter element.

[0117] It can be seen from Examples 5 to 6 that by controlling the parts of the magnesium-containing mineralized filter material, the binder, and the modified activated carbon, magnesium ions can be precipitated at the concentration and rate required by users, improving the quality of drinking water and prolonging the service life of the mineralized filter element. Therefore, it is preferred that the weight parts of the magnesium-containing mineralized filter material are 10 to 50 parts, the weight parts of the binder are 12 to 45 parts, and the weight parts of the modified activated carbon are 100 to 500 parts; most preferably, the weight parts of the magnesium-containing mineralized filter material are 30 parts, the weight parts of the binder are 30 parts, and the weight parts of the modified activated carbon are 300 parts.

[0118] Test Example 3

[0119] This test example is used to verify the influence of the mass ratio of modified magnesium ore to modified dolomite in the magnesium-containing mineralized filter material on the precipitation concentration of magnesium ions. Among them, the difference between Examples 8 to 13 and Example 1 is only the mass ratio of modified magnesium ore to modified dolomite in the magnesium-containing mineralized filter material, and the specific ratios are shown in Table 4, and the precipitation concentration of magnesium ions in the corresponding examples is shown in Table 5.

[0120] Table 4 Composition ratio table of mineralized filter elements in Examples 8 to 13

[0121] Table 5 Detection data table of mineralized filter elements in Examples 8 to 13

[0122] It can be seen from the data in Table 5 that the higher the proportion of modified magnesium ore in the magnesium-containing mineralized filter material, the higher the concentration of magnesium ions in the water when the mineralized filter element is used for the first time. As the water passing volume increases, the attenuation rate of the magnesium ion concentration in the water is relatively fast, resulting in a relatively short service life of the mineralized filter element. On the contrary, the higher the proportion of modified dolomite in the magnesium-containing mineralized filter material, the lower the concentration of magnesium ions in the water when the mineralized filter element is used for the first time. However, due to the wrapping of hydroxyapatite on the surface of modified dolomite, as the water passing volume increases, the attenuation rate of the magnesium ion concentration in the water is relatively slow, resulting in a relatively longer service life of the mineralized filter element. Therefore, by controlling the mixing ratio of modified magnesium ore and modified dolomite, it can be ensured that when the magnesium-containing mineralized filter material is applied to the mineralized filter element, the magnesium in the mineralized filter material is stably released, avoiding too high magnesium content in the water at the first use, and improving the magnesium ion release life of the mineralized filter element and prolonging the service life of the mineralized filter element. It is preferred that the mass ratio of modified magnesium ore to modified dolomite is (0.25 to 6):1, and more preferably the mass ratio of modified magnesium ore to modified dolomite is (1 to 1.5):1.

[0123] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, 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 invention.

Claims

1. A magnesium-containing mineralized filter material, characterized in that: The magnesium-containing mineralized filter material comprises modified magnesium ore and modified dolomite, and the mass ratio of the modified magnesium ore to the modified dolomite is modified magnesium ore: modified dolomite = (0.25-6):

1.

2. The magnesium-containing mineralized filter material according to claim 1, characterized in that: The mass ratio of the modified magnesium ore to the modified dolomite is modified magnesium ore: modified dolomite = (1-1.5): 1; And / or, the modified magnesium ore is prepared by the following steps: The natural magnesite is calcined at a first temperature for a first preset time, washed, dried and crushed to 20-200 meshes to obtain modified magnesium ore.

3. The magnesium-containing mineralized filter material according to claim 2, characterized in that: The first temperature is 700-800° C.; And / or, the first preset time is 1 to 2 hours.

4. The magnesium-containing mineralized filter material according to any one of claims 1 to 3, characterized in that: The modified dolomite is prepared by the following steps: S1: calcining natural dolomite at a second temperature for a second preset time, washing, drying and crushing to 20-200 meshes to obtain transition dolomite; S2: soaking the transition dolomite in a phosphoric acid solution for modification, adding an alkali solution during the soaking process to adjust the pH to an alkaline range and continuously stirring; S3: washing and drying the dolomite obtained in step S2 to obtain modified dolomite.

5. The magnesium-containing mineralized filter material according to claim 4, characterized in that: In step S1, the second temperature is 900-1000°C; And / or, in step S1, the second preset time is 1 to 2 hours; and / or, in step S2, the soaking temperature is 60-80° C.; And / or, in step S2, the soaking time is 2 to 4 hours; and / or, in step S2, the concentration of the phosphoric acid solution is 1 to 10%; And / or, in step S2, the alkaline solution is a sodium hydroxide solution, and the pH value in the alkaline range is 9-12.

6. A mineralized filter element, characterized in that: The mineralized filter element comprises the following components in parts by weight: 10 to 50 parts of magnesium-containing mineralized filter material, 12 to 45 parts of binder, and 100 to 500 parts of modified activated carbon. The magnesium-containing mineralized filter material is the magnesium-containing mineralized filter material according to any one of claims 1 to 5.

7. The mineralized filter element according to claim 6, characterized in that: The adhesive comprises high molecular weight PE rubber powder with a molecular weight of 1 to 5 million and ultra-high molecular weight PE rubber powder with a molecular weight of 5 to 8 million, and the mass ratio of the high molecular weight PE rubber powder to the ultra-high molecular weight PE rubber powder is (10 to 35): (2 to 10).

8. The mineralized filter element according to claim 6, characterized in that: The modified activated carbon is prepared by the following steps: S10: washing the coconut shell activated carbon, mixing it with hydrochloric acid or sulfuric acid, and heating it to react, thereby obtaining transition activated carbon; S20: washing the transition activated carbon to a pH of 6 to 8 and until the drainage is free of black; S30: Drying the washed activated carbon to obtain the modified activated carbon.

9. The mineralized filter element according to claim 8, characterized in that: In step S10, the concentration of the hydrochloric acid or the sulfuric acid is 5-10%; and / or, in step S10, the heating temperature is 60-80° C.; And / or, in step S10, stirring is continued during the reaction, and the reaction time is 1 to 3 hours; And / or, in step S30, the water content of the modified activated carbon is less than 10%.

10. A method for preparing a mineralized filter element, for preparing the mineralized filter element according to any one of claims 6 to 9, characterized in that: The preparation method comprises the following steps: S100: mixing magnesium-containing mineralized filter material, a binder, and modified activated carbon to form a mixture; S200: Extruding the mixed material using an independent twin-screw extruder to obtain a carbon rod; S300: cutting the carbon rod into carbon cores; S400: Assembling the carbon core into a mineralized filter element; Preferably, "extruding the mixture using an independent twin-screw extruder to obtain a carbon rod" comprises: During the extrusion process, the extrusion temperature of the primary screw of the independent twin-screw extruder is 80-100°C, and the extrusion temperature of the secondary screw is 200-230°C.

Images