Mineralized filter element and preparation method thereof

Abstract

The invention provides a mineralization filter element and a preparation method thereof, and belongs to the technical field of drinking water mineralization treatment.The mineralization filter element comprises a shell, a protolith slow-release layer, a fine sand filter material layer and a gravel receiving layer, and the shell is filled with the protolith slow-release layer, the fine sand filter material layer and the gravel receiving layer in sequence; the permeability coefficients of the protolith slow release layer, the fine sand filter material layer and the gravel receiving layer are sequentially increased by at least one hundred times to form a permeability coefficient gradient difference; when water is stopped from entering the water inlet, the gravel receiving layer is emptied to trigger capillary negative pressure, and the protolith slow release layer enables gravity water to be converted into capillary water for continuously dissolving and filtering mineral substances based on the permeability coefficient gradient difference; when water starts to enter the water inlet, capillary water of the protolith slow-release layer is converted into gravity water, and mineral substances are slowly released to the gravel receiving layer based on the permeability coefficient gradient difference. According to the mineralization filter element provided by the invention, a dissolution filtration-slow release mineralization mechanism is formed based on the synergistic effect of capillary negative pressure and permeability coefficient gradient difference, the fluctuation of effluent mineralization concentration can be reduced, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of drinking water mineralization treatment, and particularly relates to a mineralization filter core and a preparation method thereof. BACKGROUND

[0002] The mineralization filter core can adsorb and eliminate toxic substances and supplement trace elements such as potassium, calcium, magnesium, iron, zinc, selenium and strontium in water which are beneficial to human body. The drinking water after mineralization treatment is helpful to improve the body fluid environment of human body and improve the metabolic capacity of human body.

[0003] The existing drinking water mineralization technology is mostly to perform physical adsorption and chemical reaction on substances in water through a homogeneous filter material layer such as activated carbon, zeolite and manganese sand in the filter core, so as to remove harmful substances and add minerals beneficial to human body. This mineralization technology has two defects: one is that the mineralization process depends on water flow flushing, and the mineralization will be interrupted in a short time after the water flow stops, thereby causing a large fluctuation of mineralization concentration; the other is that the homogeneous filter material layer is preferentially invalidated in a high flow rate area, and the mineralization efficiency is obviously decreased after two thousand throughputs, thereby limiting the service life of the mineralization filter core. SUMMARY

[0004] The present application provides a mineralization filter core and a preparation method thereof, aiming to reduce the fluctuation of drinking water mineralization concentration and improve the effective service life of the mineralization filter core.

[0005] To achieve the above object, the technical scheme adopted by the present application is as follows: in a first aspect, a mineralization filter core is provided, comprising a shell, and a primary rock slow-release layer, a fine sand filter material layer and a gravel receiving layer filled in the shell in sequence; the fine sand filter material layer is located between the primary rock slow-release layer and the gravel receiving layer; a water inlet is arranged on the top wall of the shell, and a water outlet is arranged on the bottom wall of the shell. The permeability coefficients of the primary rock slow-release layer, the fine sand filter material layer and the gravel receiving layer are increased by at least one hundred times in sequence to form a permeability coefficient gradient difference. When the water inlet stops water inflow, the gravel receiving layer empties to trigger capillary negative pressure, and the primary rock slow-release layer converts gravity water into capillary water which continuously leaches minerals based on the permeability coefficient gradient difference. When the water inlet starts water inflow, the capillary water of the primary rock slow-release layer is converted into gravity water and releases minerals to the gravel receiving layer based on the permeability coefficient gradient difference.

[0006] In combination with the first aspect, in a possible implementation manner, the permeability coefficient of the primary rock slow-release layer is 10 -5 cm / s; the permeability coefficient of the fine sand filter material layer is 10 -3 cm / s; and the permeability coefficient of the gravel receiving layer is 10 -1cm / s.

[0007] In some embodiments, the original rock slow-release layer is basalt sintered with calcium and magnesium minerals, and has a porosity of 25-35%, and a capillary water rising height of ≥60 cm. The rhyolite fine sand content of the fine sand filter layer is ≥90%, the compaction porosity is 35±3%, and the capillary water rising height is ≥50 cm. The quartz gravel content of the gravel receiving layer is ≥90%, the natural bulk porosity is 38±2%, and the capillary water rising height is ≤2 cm.

[0008] For example, the original rock slow-release layer is arranged around the inner circumferential wall of the shell and is closed at the upper and lower ends, and the gravel receiving layer is located at the center of the original rock slow-release layer; the top wall of the shell is provided with a breathable micropore, and the bottom wall of the shell is provided with a filter screen covering the water outlet.

[0009] For example, the diameter of the breathable micropore is 9-11 μm, and the mesh diameter of the filter screen is ≤0.1 mm.

[0010] The mineralization filter core provided by the present application has the following advantages: compared with the prior art, the mineralization filter core provided by the present application is provided with an original rock slow-release layer, a fine sand filter layer and a gravel receiving layer with a gradient difference of not less than one hundred times of the permeability coefficient in the shell; the original rock slow-release layer has a low permeability coefficient, can provide a mineral source and a capillary water carrier, and can slowly release the mineral in the water in the form of ion diffusion to the gravel receiving layer; the fine sand filter layer has a higher permeability coefficient than the original rock slow-release layer and a lower permeability coefficient than the gravel receiving layer, can also provide a mineral source and a capillary water carrier, can continuously leach the mineral with capillary water when the water is stopped, and can buffer the sudden change of the permeability coefficient between the original rock slow-release layer and the gravel receiving layer when the water is supplied, thereby avoiding reverse osmosis due to too large ion concentration in the gravel layer; the gravel receiving layer as a high-permeability zone can slowly release the mineral from the original rock slow-release layer to the gravel receiving layer in the form of ion convection through the difference in the permeability coefficient, and can quickly dilute the mineral in the gravel receiving layer and then discharge the mineral from the water outlet.

[0011] The leaching and slow-release mineralization mechanism formed by the synergistic action of the capillary negative pressure and the gradient difference of the permeability coefficient of the above-mentioned three layers of filter material can continuously leach the mineral with capillary water when the water is stopped, and slowly release the mineral leached in the capillary water when the water is supplied by using the gradient difference of the permeability coefficient, so that not only the mineralization concentration fluctuation of the water outlet can be avoided, but also the service life limit of the traditional mineralization filter core can be broken through.

[0012] In a second aspect, the present application also provides a preparation method of a mineralization filter core, which is used for preparing the above-mentioned mineralization filter core and includes the following steps: The basalt is crushed and screened to obtain raw rock particles, the raw rock particles are sintered and modified to obtain a raw rock cylinder and a raw rock cover, and the raw rock cylinder and the raw rock cover are pickled and cleaned; The maifanite is crushed and screened to obtain fine sand particles, and the fine sand particles are pickled and cleaned; The quartz sand is screened to obtain gravel particles, and the gravel particles are pickled and cleaned; The fine sand particles and the gravel particles are sequentially filled in the raw rock cylinder and compacted to obtain a fine sand filter material layer and a gravel receiving layer, and the raw rock cylinder is capped with the raw rock cover to obtain a raw rock slow-release layer; The mineralized filter core is obtained after the packaging shell is sealed.

[0013] In combination with the second aspect, in some embodiments, the raw rock particles have a particle size of 2-5 mm, a sintering temperature of 800-850 DEG C, and a sintering time of 2-3 hours; and the raw rock cylinder and the raw rock cover have the same wall thickness.

[0014] In some possible implementations, the fine sand particles have a particle size of 0.1-0.25 mm and a compacted density of 1.55-1.65 g / cm 3 .

[0015] For example, the gravel particles have a particle size of 2-10 mm and a compacted density of 1.75-1.85 g / cm 3 .

[0016] For example, the volume ratio of the raw rock slow-release layer, the fine sand filter material layer, and the gravel receiving layer is 2:3:1.

[0017] The mineralized filter core preparation method provided by the present application has the following advantages: compared with the prior art, the mineralized filter core preparation method can obtain the mineralized filter core described above, the raw rock slow-release layer has a low permeability coefficient, can provide a mineral source and a capillary water carrier, and can slowly release the mineral in the water in the form of ion diffusion to the gravel receiving layer; the fine sand filter material layer has a higher permeability coefficient than the raw rock slow-release layer and a lower permeability coefficient than the gravel receiving layer, can also provide a mineral source and a capillary water carrier, can continuously leach the mineral in the capillary water when there is no water supply, and can buffer the sudden change of the permeability coefficient between the raw rock slow-release layer and the gravel receiving layer when there is water supply, thereby avoiding the reverse osmosis caused by the excessive ion concentration in the gravel layer; the gravel receiving layer as a high-permeability zone can slowly release the mineral from the raw rock slow-release layer to the gravel receiving layer in the form of ion convection through the difference in the permeability coefficient, and can quickly dilute the mineral in the gravel receiving layer and then discharge the mineral from the outlet. The leaching and slow-release mineralization mechanism based on the synergistic effect of the capillary negative pressure and the difference in the permeability coefficient gradient can continuously leach the mineral in the capillary water when there is no water supply, and slowly release the mineral leached in the capillary water when there is water supply, so that not only can the mineralization concentration fluctuation of the outlet be avoided, but also the service life limit of the traditional mineralized filter core can be broken through. Attached Figure Description

[0018] Figure 1 A cross-sectional structural diagram of the mineralized filter element provided in the embodiment of the present invention in a water outage state; Figure 2 This is a cross-sectional structural diagram of the mineralized filter element provided in the embodiment of the present invention in the water inlet state.

[0019] In the diagram: 10, shell; 11, inlet; 12, outlet; 13, ventilated micropores; 14, filter screen; 20, original rock slow-release layer; 30, fine sand filter media layer; 40, gravel receiving layer. Detailed Implementation

[0020] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0021] It should be noted that when an element is referred to as being "set on" or "connected to" another element, it can be directly on or indirectly on the other element. It should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] Please refer to the following: Figure 1 and Figure 2 The present invention will now describe a mineralization filter element. A mineralization filter element includes a shell 10, and a primary rock slow-release layer 20, a fine sand filter media layer 30, and a gravel receiving layer 40 sequentially filled within the shell 10; the fine sand filter media layer 30 is located between the primary rock slow-release layer 20 and the gravel receiving layer 40; the top wall of the shell 10 is provided with an inlet 11, and the bottom wall of the shell 10 is provided with an outlet 12.

[0023] Among them, the permeability coefficients of the original rock slow release layer 20, the fine sand filter layer 30, and the gravel receiving layer 40 increase by at least one hundred times in sequence, forming a permeability coefficient gradient difference; when the water intake 11 stops, the gravel receiving layer 40 is emptied, triggering capillary negative pressure, and the original rock slow release layer 20 converts gravity water into capillary water that continuously dissolves minerals based on the permeability coefficient gradient difference; when the water intake 11 starts to receive water, the capillary water of the original rock slow release layer 20 is converted into gravity water and releases minerals into the gravel receiving layer 40 slowly based on the permeability coefficient gradient difference.

[0024] It should be noted that the mineralization working principle of the mineralization filter element provided in this embodiment is as follows: First, a permeability gradient difference is formed by utilizing a three-layer permeability gradient structure consisting of the original rock slow-release layer 20, the fine sand filter layer 30, and the gravel receiving layer 40: The role of the original rock slow release layer 20 as a low-permeability zone is to provide a mineral source and capillary water carrier, so as to realize the slow release of minerals in the water to the gravel receiving layer 40. During the release process, the movement of minerals in the original rock release layer is dominated by ion diffusion, thereby achieving the effect of slow release.

[0025] The fine sand filter media layer 30 serves as a low permeability zone, providing a mineral source and capillary water carrier. When water supply is interrupted, it achieves capillary negative pressure to lock water and allow minerals to continue to dissolve and filter. When water is introduced, it buffers sudden changes in the permeability coefficient, preventing excessive mineral concentration in the gravel receiving layer 40 and back osmosis. It is equivalent to a "storage pool" for mineral ions.

[0026] The gravel receiving layer 40 serves as a high-permeability zone by utilizing the permeability gradient difference to allow minerals to be slowly released from the original rock slow-release layer 20 to the gravel receiving layer 40. During the seepage process, the movement of minerals in the gravel receiving layer 40 is dominated by ion convection, which rapidly dilutes the mineral concentration in the water.

[0027] Second, utilizing the leaching-slow-release mineralization mechanism based on the gradient difference in permeability coefficients: Abrupt change in permeability coefficient (permeability coefficient gradient difference ≥ 100 times): When water intake stops, the gravel receiving layer 40 will quickly drain out due to its high permeability coefficient, while the fine sand filter layer 30 and the original rock slow release layer 20 will form a permeability barrier due to their low permeability coefficient.

[0028] The dominant role of capillary negative pressure: After the gravel receiving layer 40 is emptied, a gas-liquid interface is formed between it and the fine sand filter layer 30. At this time, -10 will be generated in the micropores of the fine sand filter layer 30 and the original rock slow-release layer 20. 3 ~-10 4 Pa matrix suction.

[0029] Continuous filtration: such as Figure 1 As shown, when water supply is interrupted, the gravity water in the original rock slow-release layer 20 and the fine sand filter layer 30 is converted into capillary water (specifically, supporting capillary water, the original rock slow-release layer 20 has a lower permeability coefficient and supports capillary water rise height ≥ 60 cm, and the fine sand filter layer 30 supports capillary water rise height ≥ 50 cm). The capillary water is used to maintain the original rock slow-release layer 20 and the fine sand filter layer 30 in a water-saturated state, thereby achieving the continuous dissolution of minerals by capillary water.

[0030] Specifically, the mineral matter is slowly released for a long time. The mineral matter in the original rock slow-release layer 20 and the fine sand filter material layer 30 can be dissolved for 24 hours. Compared with the conventional filter element that relies entirely on gravity water to slowly release the mineral matter for less than 5 minutes, the mineral matter can be fully dissolved.

[0031] The slow-release mechanism is as shown in FIG. 2. Figure 2 As shown in FIG. 2, when the water starts to flow, the capillary water in the original rock slow-release layer 20 is converted into gravity water. Based on the difference in the hydraulic conductivity gradient, the seepage velocity of the original rock slow-release layer 20 is low, and the flow is small. Therefore, the dominant role of solute transport is ion diffusion, thereby achieving slow release of the mineral matter. The seepage velocity of the gravel receiving layer 40 is fast, and the flow is large. Therefore, the dominant role of solute transport is ion convection, thereby achieving rapid dilution of the mineral matter.

[0032] The essence of the slow-release mechanism is to create a water resistance difference through the difference in the hydraulic conductivity gradient, thereby decoupling the ion diffusion rate of the mineral matter and the water flow rate, and making the outlet water mineral matter concentration tend to be stable.

[0033] Compared with the prior art, the mineralization filter element provided in the embodiment is provided with the original rock slow-release layer 20, the fine sand filter material layer 30, and the gravel receiving layer 40 with a hydraulic conductivity gradient difference of not less than 100 times in the shell 10. The original rock slow-release layer 20 has a low hydraulic conductivity, can provide a mineral matter source and a capillary water carrier, and can achieve slow release of the mineral matter in the water to the gravel receiving layer 40 in the form of ion diffusion. The fine sand filter material layer 30 has a higher hydraulic conductivity than the original rock slow-release layer 20 and a lower hydraulic conductivity than the gravel receiving layer 40, can also provide a mineral matter source and a capillary water carrier, can continuously dissolve the mineral matter with the capillary water when the water is stopped, and can buffer the sudden change of the hydraulic conductivity between the original rock slow-release layer 20 and the gravel receiving layer 40 when the water is supplied, thereby avoiding reverse osmosis caused by excessive ion concentration in the gravel layer. The gravel receiving layer 40 as a high-permeability zone can achieve slow release of the mineral matter from the original rock slow-release layer 20 to the gravel receiving layer 40 in the form of ion convection through the difference in the hydraulic conductivity, and can discharge the outlet water 12 after rapid dilution of the mineral matter in the gravel receiving layer 40.

[0034] The dissolution-slow-release mineralization mechanism formed by the synergistic effect of the capillary negative pressure and the difference in the hydraulic conductivity gradient of the above-mentioned three layers of filter material can continuously dissolve the mineral matter with the capillary water when the water is stopped, and slowly release the mineral matter dissolved in the capillary water when the water is supplied through the difference in the hydraulic conductivity gradient. Therefore, not only can the mineralization concentration fluctuation of the outlet water 12 be avoided, but also the service life limit of the conventional mineralization filter element can be broken through.

[0035] In some embodiments, the hydraulic conductivity of the original rock slow-release layer 20 is 10 -5 cm / s; the hydraulic conductivity of the fine sand filter material layer 30 is 10 -3 cm / s; and the hydraulic conductivity of the gravel receiving layer 40 is 10-1 cm / s.

[0036] Specifically, the original rock slow-release layer 20 is made of basalt containing calcium and magnesium minerals, the porosity thereof is 25-35%, preferably 30%, the capillary water rising height is ≥60 cm; the content of rhyolite fine sand in the fine sand filter layer 30 is ≥90%, the compaction porosity is 35±3%, the capillary water rising height is ≥50 cm; the content of quartz gravel in the gravel receiving layer 40 is ≥90%, the natural stacking porosity is 38±2%, the capillary water rising height is ≤2 cm.

[0037] It should be explained that the capillary water refers to the underground water kept in the capillary voids of soil due to capillary action. In this embodiment, the principle of capillary negative pressure in the field of soil hydrology is applied to the filter core, and the gradient difference of the permeability coefficient is combined to solve the problem of mineralization stability, so as to reduce the fluctuation of the mineralization concentration.

[0038] The permeability coefficient of the gravel receiving layer 40 is as high as 10 -1 cm / s, and the internal voids are large. Under normal circumstances, the capillary water in the gravel receiving layer 40 is difficult to break through 2 cm, so that the gravity water in the gravel receiving layer 40 is basically discharged in the water stop stage; the permeability coefficient on the critical surface between the fine sand filter layer 30 and the gravel receiving layer 40 suddenly changes from 10 -1 cm / s to 10 -3 cm / s, and after the gravity water in the gravel receiving layer 40 is discharged, an air-liquid interface is formed, which further causes the matrix suction in the micro-pores of the fine sand filter layer 30 and the original rock slow-release layer 20 to be-10 3 ~-10 4 Pa, and since the permeability coefficient of the original rock slow-release layer 20 further suddenly changes to 10 -5 cm / s, the matrix suction in the micro-pores of the original rock slow-release layer 20 is higher. As a result, the capillary water rising height of the fine sand filter layer 30 is more than 50 cm, and the capillary water of the original rock slow-release layer 20 can reach more than 60 cm. In this way, the capillary water rising height difference between the original rock slow-release layer 20 and the gravel receiving layer 40 can reach 58 cm, so that the saturated leaching state of the original rock slow-release layer 20 can be maintained for twenty-four hours.

[0039] The basalt containing calcium and magnesium minerals can adjust the pH value of water, supplement minerals, and improve the taste of drinking water. In this embodiment, the basalt containing calcium and magnesium minerals is modified by sintering, which can destroy the mineral lattice, increase the specific surface area, so that the minerals can be more fully contacted with water, and the minerals can be more easily dissolved in water. In addition, the sintered basalt can release minerals more uniformly, so as to be beneficial to reducing the fluctuation of the mineralization concentration of the outlet water.

[0040] The medical stone has strong adsorption and porous structure, can adsorb and decompose free chlorine, impurities, organic matter and bacteria in water, and provide mineral matter; the medical stone is crushed into fine sand particles to form the fine sand filter material layer 30 by compaction, so that low permeability coefficient is obtained to realize capillary water locking, thereby prolonging the solution filtering time to more than 24 hours; and the permeability coefficient is buffered between the original rock slow release layer 20 and the gravel receiving layer 40, thereby avoiding the reverse osmosis phenomenon caused by the too large permeability coefficient between the two.

[0041] The gravel receiving layer 40 is mainly composed of quartz particles, which can remove impurities, silt and suspended matter in water, reduce turbidity of the water, and remove viruses and organic matter in the water, thereby improving water quality.

[0042] As a specific structure of the mineralization filter core, please refer to Figure 1 and Figure 2 The original rock slow release layer 20 is arranged around the inner wall of the shell 10 and is closed at the upper and lower ends, and the gravel receiving layer 40 is located at the center of the original rock slow release layer 20.

[0043] The top wall of the shell 10 is provided with a gas permeable micropore 13, and the bottom wall of the shell 10 is provided with a filter screen 14 covering the water outlet 12. Specifically, the pore size of the gas permeable micropore 13 is 9-11 μm, preferably 10 μm; and the mesh size of the filter screen 14 is ≤0.1 mm.

[0044] The gas permeable micropore 13 can ventilate the original rock slow release layer 20 when water is stopped, thereby avoiding the vacuum lock effect to block the migration and upward movement of capillary water; and the filter screen 14 covering the water outlet 12 can avoid the migration and leakage of gravel particles.

[0045] Based on the same inventive concept, in combination with Figure 1 and Figure 2 The application also provides a mineralization filter core preparation method for preparing the mineralization filter core, which comprises the following steps: The basalt is crushed and sieved to obtain original rock particles, the original rock particles are sintered and modified to process original rock cylinders and original rock covers, and the original rock cylinders and the original rock covers are pickled and impurities are removed; The medical stone is crushed and sieved to obtain fine sand particles, and the fine sand particles are pickled and impurities are removed; The quartz sand is sieved to obtain gravel particles, and the gravel particles are pickled and impurities are removed; The fine sand particles and the gravel particles are sequentially filled in the original rock cylinders and compacted to obtain the fine sand filter material layer 30 and the gravel receiving layer 40, and the original rock cylinders are capped with the original rock covers to obtain the original rock slow release layer 20; The mineralization filter core is obtained after the shell is packaged.

[0046] It should be noted that the above-mentioned acid pickling of the original rock cylinder, the original rock cover, the fine sand particles and the gravel particles can all use a 5% concentration of citric acid solution to soak for two hours and then wash.

[0047] The above-mentioned shell can be formed by injection molding of food-grade ABS plastic. In order to facilitate the replacement of the internal filter layer, the shell can be set as a split structure of a cylindrical body with open ends and two end covers.

[0048] The original rock slow-release layer 20 also has a circular cross-section based on the cylindrical part of the shell. From the perspective of fluid mechanics, this can ensure that the water flow passes through the original rock slow-release layer 20 uniformly, avoiding the "short circuit effect". Moreover, the capillary effect is also affected by the shape of the rock. The curved surface of the inner wall of the cylinder is conducive to forming a more continuous capillary channel, thereby improving the water locking stability and prolonging the water stop leaching time. From the perspective of material mechanics, basalt as a natural rock has internal fissures. The circular cross-section structure has better compression resistance. When the two end covers of the shell are locked, the stress is more uniform. From the perspective of production and manufacturing, the circular cross-section structure is more compatible with existing water purification systems.

[0049] Compared with the prior art, the mineralization filter core preparation method provided in the embodiment can obtain the above-mentioned mineralization filter core. The original rock slow-release layer 20 has a low permeability coefficient and can provide a mineral source and a capillary water carrier, so as to realize the slow release of the minerals in the water to the gravel receiving layer 40 in the form of ion diffusion. The fine sand filter layer 30 has a higher permeability coefficient than the original rock slow-release layer 20 and a lower permeability coefficient than the gravel receiving layer 40, and can also provide a mineral source and a capillary water carrier. The capillary water can continuously leach the minerals when the water is stopped, and can buffer the sudden change of the permeability coefficient between the original rock slow-release layer 20 and the gravel receiving layer 40 when the water is turned on, thereby avoiding the reverse osmosis caused by the excessive ion concentration of the gravel layer. The gravel receiving layer 40 as a high-permeability zone can realize the slow release of the minerals from the original rock slow-release layer 20 to the gravel receiving layer 40 in the form of ion convection through the difference in the permeability coefficient, and the minerals can be quickly diluted in the gravel receiving layer 40 and then discharged from the water outlet 12.

[0050] The obtained mineralization filter core has a leaching and slow-release mineralization mechanism formed by the synergistic effect of capillary negative pressure and the gradient difference in the permeability coefficient. The minerals can be continuously leached by the capillary water when the water is stopped, and the minerals leached in the capillary water can be slowly released when the water is turned on by using the gradient difference in the permeability coefficient. Therefore, not only can the mineralization concentration fluctuation of the water outlet 12 be avoided, but also the service life limit of the traditional mineralization filter core can be broken through.

[0051] In combination with the second aspect, in some embodiments, the original rock particles have a particle size of 2-5 mm, a sintering temperature of 800-850℃, and a sintering time of 2-3 hours; and the wall thickness of the original rock cylinder and the original rock cover is the same.

[0052] In some possible implementation manners, the fine sand particles have a particle size of 0.1-0.25 mm and a compacted density of 1.55-1.65 g / cm 3 , preferably a compacted density of 1.6 g / cm 3 .

[0053] Illustratively, the gravel particles have a particle size of 2-10 mm and a compacted density of 1.75-1.85 g / cm 3 , preferably a compacted density of 1.8 g / cm 3 .

[0054] For example, the volume ratio of the original rock slow-release layer 20, the fine sand filter layer 30 and the gravel receiving layer 40 is 2:3:1. The fine sand filter layer 30 needs to account for a high proportion, and the capillary water locking needs to have sufficient thickness, too thin will lead to insufficient capillary negative pressure when the water is stopped (here, the capillary effect is equivalent to touching water with a corner of a paper towel, and water will automatically climb up along the paper towel texture, the longer the paper towel, the higher the climbing height, if the paper towel is too short, water will be difficult to climb, and the thickness of the fine sand filter layer 30 is equivalent to the length of the paper towel); the volume of the original rock slow-release layer 20 is greater than that of the gravel receiving layer 40, which is to balance the mineral reserves and the water flow rate, so as to ensure twenty-four hours of sustained slow release, and the gravel layer serves as a water flow channel, and in the case of meeting the flow demand, the smaller the volume, the more conducive to the compactness of the overall structure.

[0055] The mineralized filter element provided by the embodiment of the present application is based on the synergistic mechanism of the capillary negative pressure and the gradient difference of the permeability coefficient, and the comparison of the quantitative indexes of the traditional filter element is shown in Table 1. Table 1 Comparison of quantitative indexes

[0056] The above merely provides the preferred embodiments of the present application and should not be used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A mineralized filter cartridge, characterized in that, The mineralization filter core comprises a shell, and a primary rock slow-release layer, a fine sand filter layer, and a gravel receiving layer filled in the shell in sequence; the fine sand filter layer is located between the primary rock slow-release layer and the gravel receiving layer; a top wall of the shell is provided with a water inlet, and a bottom wall of the shell is provided with a water outlet; The permeability coefficients of the primary rock slow-release layer, the fine sand filter layer, and the gravel receiving layer are increased by at least one hundred times in sequence to form a permeability coefficient gradient difference; When the water inlet stops water feeding, the gravel receiving layer is emptied to trigger capillary negative pressure, and the primary rock slow-release layer converts gravity water into capillary water for continuously leaching minerals based on the permeability coefficient gradient difference; When the water inlet starts water feeding, the capillary water of the primary rock slow-release layer is converted into gravity water and slowly releases minerals to the gravel receiving layer based on the permeability coefficient gradient difference.

2. A mineralized filter cartridge as defined in claim 1, wherein, The permeability coefficient of the original rock slow-release layer is 10 - 5 cm / s; the permeability coefficient of the fine sand filter layer is 10 -3 cm / s; and the permeability coefficient of the gravel receiving layer is 10 -1 cm / s.

3. A mineralizing filter cartridge as defined in claim 1 wherein, The primary rock slow-release layer is formed by sintering calcium-magnesium mineral-containing basalt, and has a porosity of 25-35% and a capillary water rising height of ≥60 cm; The fine sand filter layer has a content of Rhyolite fine sand of ≥90%, a compacted porosity of 35±3%, and a capillary water rising height of ≥50 cm; The gravel receiving layer has a content of quartz gravel of ≥90%, a natural bulk porosity of 38±2%, and a capillary water rising height of ≤2 cm.

4. A mineralizing filter cartridge as defined in claim 1 wherein, The primary rock slow-release layer is arranged around the inner circumferential wall of the shell and is closed at both upper and lower ends, and the gravel receiving layer is located at the center of the primary rock slow-release layer; the top wall of the shell is provided with air-permeable micropores, and the bottom wall of the shell is provided with a filter screen covering the water outlet.

5. A mineralizing filter cartridge as defined in claim 4 wherein, The air-permeable micropores have a pore size of 9-11 μm, and the filter screen has a mesh size of ≤0.1 mm.

6. A method of preparing a mineralized filter cartridge, the method comprising: A method for preparing a mineralization filter core as claimed in any one of claims 1-5 comprises the following steps: Basalt is crushed and sieved to obtain primary rock particles, the primary rock particles are modified by sintering to obtain a primary rock cylinder and a primary rock cover, and the primary rock cylinder and the primary rock cover are pickled to remove impurities; Rhyolite is crushed and sieved to obtain fine sand particles, and the fine sand particles are pickled to remove impurities; Quartz sand is sieved to obtain gravel particles, and the gravel particles are pickled to remove impurities; The fine sand particles and the gravel particles are sequentially filled in the primary rock cylinder to compact a fine sand filter layer and a gravel receiving layer, and the primary rock cylinder is sealed with the primary rock cover to obtain a primary rock slow-release layer; The mineralization filter core is obtained after the shell is packaged.

7. A method of preparing a mineralized filter cartridge as defined in claim 6, wherein, The primary rock particles have a particle size of 2-5 mm, a sintering temperature of 800-850 ℃, and a sintering time of 2-3 hours; and the primary rock cylinder and the primary rock cover have the same wall thickness.

8. A method of preparing a mineralized filter cartridge as defined in claim 6, wherein, The fine sand particles are 0.1-0.25 mm in size and have a compacted density of 1.55-1.65 g / cm 3 .

9. A method of preparing a mineralized filter cartridge as defined in claim 6, wherein, The gravel particles are 2-10 mm in size and have a compaction density of 1.75-1.85 g / cm 3 .

10. A method of preparing a mineralized filter cartridge according to any one of claims 6-9, wherein, The volume ratio of the primary rock slow-release layer, the fine sand filter layer, and the gravel receiving layer is 2:3:1.

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