A filter element for simulating the quality of drinking water of underground water in Wuyi Mountain and a preparation method thereof

Abstract

The application provides a filter core of drinking water simulating water quality of Wuyi Mountain underground water and a preparation method thereof, and relates to the technical field of drinking water mineralization. The filter core of drinking water simulating water quality of Wuyi Mountain underground water comprises, by weight, modified rock 120-180 parts, activated carbon 150-190 parts and adhesive 150-190 parts; wherein the rock comprises one or more of quartz diorite porphyry and granodiorite. The filter core provided by the application can simulate Wuyi Mountain mineral water, which has soft taste, low mineralization degree and is beneficial to human health.

Description

Technical Field

[0001] This invention relates to the field of drinking water mineralization technology, specifically to a drinking water filter element that simulates the groundwater quality of Wuyi Mountain and its preparation method. Background Technology

[0002] Healthy drinking water is an important part of a healthy life. Currently, people mainly use household water purifiers to solve the problem of safe and healthy drinking water. However, more than 90% of the water purifiers sold on the market are pure water machines supported by RO reverse osmosis technology. Pure water machines filter out almost all pollutants in drinking water and solve the problem of drinking water safety. However, because pure water lacks minerals, it still faces the problem of drinking water health.

[0003] Mineralization of drinking water is a crucial technological direction for addressing drinking water health. This is evident in the packaged drinking water sector, where mineral water, rich in various minerals and of high quality, commands a relatively high price among purified water, mineralized water, and spring water. Among the many spring water options, Wuyishan mineral water, formed over millennia through seepage from granite fissures 300 meters underground in the Yanshan Mountains, contains a variety of minerals and trace elements. It also exhibits low mineralization, low calcium content, and a metasilicic acid composition, making it a preferred choice. However, current mineralization technologies struggle to replicate the quality of Wuyishan mineral water, thus no product on the market can yet truly mimic its characteristics. Summary of the Invention

[0004] The purpose of this invention is to provide a filter cartridge for drinking water that simulates the groundwater quality of Wuyi Mountain. Using this filter cartridge, consumers can obtain simulated Wuyi Mountain mineral water, which has a soft taste, low mineralization, and is beneficial to human health.

[0005] Another objective of this invention is to provide a method for preparing a filter cartridge for drinking water that simulates the groundwater quality of Wuyi Mountain.

[0006] The technical problem solved by this invention is achieved by the following technical solution:

[0007] A filter element for drinking water that simulates the groundwater quality of Wuyi Mountain, comprising, by weight, 120-180 parts of modified rock, 150-190 parts of activated carbon, and 150-190 parts of binder; wherein the rock includes one or more of quartz diorite porphyry and granodiorite.

[0008] Optionally, in some embodiments of the present invention, the raw materials include, by weight, 140-160 parts of modified rock, 160-180 parts of activated carbon, and 160-180 parts of binder.

[0009] Optionally, in some embodiments of the present invention, the modified rock is 35-200 mesh rock powder, the activated carbon is 80-325 mesh activated carbon powder, and the binder is 80-325 mesh ultra-high molecular weight polyethylene powder.

[0010] Optionally, in some embodiments of the present invention, the modification treatment of the modified rock includes: placing the rock in a silica vapor atmosphere.

[0011] Optionally, in some embodiments of the present invention, the concentration of silica vapor is 3.5 mol / L to 4.5 mol / L, and the standing time is 20 to 40 min.

[0012] Optionally, in some embodiments of the present invention, the modification treatment of the modified rock includes: immersing the rock in a food-grade sodium citrate solution.

[0013] Optionally, in some embodiments of the present invention, the concentration of the food-grade sodium citrate solution is 4.0 mol / L to 5.0 mol / L, and the soaking time is 20 to 28 hours.

[0014] Optionally, in some embodiments of the present invention, the temperature of the food-grade sodium citrate solution is 20–30°C.

[0015] Optionally, in some embodiments of the present invention, the modification treatment of the modified rock includes: letting the rock stand at a temperature of 650°C to 700°C for 2 to 4 hours.

[0016] In addition, a method for preparing a drinking water filter element that simulates the groundwater quality of Wuyi Mountain includes:

[0017] Provide raw materials; by weight, the raw materials include 120-180 parts of modified rock, 150-190 parts of activated carbon, and 150-190 parts of binder, wherein the rock includes one or more of quartz diorite porphyry and granodiorite;

[0018] The raw materials are mixed, pressed into shape, sintered, and assembled.

[0019] Compared with the prior art, the present invention has the following beneficial effects: using the filter element provided by the present invention, drinking water that meets the water quality requirements of Wuyishan mineral water can be obtained. This drinking water has a soft taste, low mineralization, good uniformity, and is beneficial to human health. Detailed Implementation

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The technical solutions provided by this invention will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments. Furthermore, in the description of this invention, the term "comprising" means "including but not limited to". Various embodiments of this invention may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a rigid limitation on the scope of this invention; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range.

[0022] This project aims to simulate the mineral water of Wuyishan Mountain through relevant investigations and research. The study found that the early Yanshanian mineralized rocks in Wuyishan are mainly composed of biotite granodiorite porphyry, quartz diorite porphyry, granodiorite, and biotite granite. The stratigraphic rocks in the Wuyishan area include quartz sandstone, dolomite, limestone, tuff, and basalt. The composition of Wuyishan mineral water is characterized by metasilicic acid 30–50 mg / L, calcium 1.0–3 mg / L, potassium 1.0–6.8 mg / L, magnesium 1.0–7.2 mg / L, sodium 2.6–18.8 mg / L, and a TDS value of 40–160.

[0023] For the rocks from the Wuyishan mineral water production area: biotite granodiorite porphyry, quartz diorite porphyry, granodiorite, biotite granite, quartz sandstone, dolomite, limestone, tuff, and basalt, systematic tests were conducted on the above rocks. Specifically, 1000g of each of the above ores was taken, ground into powder, and sieved to obtain ore powder of 35-200 mesh for later use.

[0024] Take 20g of each of the sieved 35-200 mesh ore powders, grind them again, and sieve to obtain 200-325 mesh ore powder for later use. Take 2g of each of the different types of sieved ore powders and perform component analysis. The analysis results are shown in Table 1.

[0025] Table 1 Mass fraction of chemical composition of different ores

[0026]

[0027]

[0028] The Wuyishan mineral water is characterized by metasilicic acid (30-50 mg / L), calcium (1.0-3 mg / L), potassium (1.0-6.8 mg / L), magnesium (1.0-7.2 mg / L), sodium (2.6-18.8 mg / L), and a TDS value of 40-160, classifying it as a low-mineralized, low-calcium metasilicic acid type mineral water. Based on the above rock composition analysis data, quartz diorite porphyry, granodiorite, biotite granite, quartz sandstone, and tuff have a silica content exceeding 50% and can be considered for metasilicic acid mineralization. Dolomite and limestone have a calcium oxide content exceeding 30%, which may result in the precipitation of large amounts of calcium and may be unsuitable for use. Dolomite with a magnesium oxide content reaching 20% ​​may also result in the precipitation of large amounts of magnesium and may be unsuitable for use.

[0029] Because of the differences in the content and precipitation of ore components, elements contained in the ore may not necessarily precipitate in water. Therefore, in order to screen out rocks that can be mineralized, further soaking analysis of the rocks is required.

[0030] Take 100g of sieved ore powder of 35-200 mesh and place it in 500mL of pure water. Soak it at a constant temperature of 25℃±5℃ for 24h. Take the supernatant and test the following indicators in the water: calcium, magnesium, sodium, potassium, metasilicic acid, arsenic, cadmium, chromium, lead, aluminum, iron, manganese, copper, zinc, silver, barium, nickel and antimony. The test results are shown in Tables 2, 3, 4, 5 and 6.

[0031] Table 2. Data on leachable substances from biotite granodiorite porphyry and quartz diorite porphyry ores (unit: mg / L)

[0032]

[0033]

[0034] Table 3. Data on leaching precipitates from granodiorite and biotite granite ores (unit: mg / L)

[0035] Potassium 8.9 / / 12.6 / / calcium 9.8 / / 4.8 / / sodium 9.9 / / 9.6 / / magnesium 4.8 / / 1.7 / / metasilicic acid 74.3 / / 83.3 / / arsenic ND 0.001 qualified ND 0.001 qualified cadmium ND 0.0005 qualified ND 0.0005 qualified chromium ND 0.005 qualified ND 0.005 qualified lead ND 0.001 qualified ND 0.001 qualified aluminum 0.0564 0.02 Unqualified 0.0552 0.02 Unqualified iron 0.0215 0.06 qualified 0.0197 0.06 qualified manganese 0.0065 0.02 qualified 0.0054 0.02 qualified copper ND 0.2 qualified ND 0.2 qualified Zinc ND 0.2 qualified ND 0.2 qualified silver ND 0.005 qualified ND 0.005 qualified barium 0.0002 0.05 qualified ND 0.05 qualified nickel 0.0002 0.002 qualified ND 0.002 qualified antimony ND 0.0005 qualified ND 0.0005 qualified

[0036] Table 4. Data on leaching substances from quartz sandstone and dolomite ores (unit: mg / L)

[0037]

[0038]

[0039] Table 5. Data on leached substances from limestone and tuff ores (unit: mg / L)

[0040] Potassium ND / Low 13.7 / / calcium 143.4 / Too high 0.3 / Low sodium ND / Low 9.3 / / magnesium ND / High 4.4 / / metasilicic acid ND / Low 66.6 / / arsenic ND 0.001 qualified ND 0.001 qualified cadmium ND 0.0005 qualified 0.0001 0.0005 qualified chromium ND 0.005 qualified 0.0001 0.005 qualified lead ND 0.001 qualified 0.0002 0.001 qualified aluminum ND 0.02 qualified 0.0597 0.02 Unqualified iron ND 0.06 qualified 0.0412 0.06 qualified manganese ND 0.02 qualified 0.0061 0.02 qualified copper ND 0.2 qualified ND 0.2 qualified Zinc 0.0001 0.2 qualified ND 0.2 qualified silver ND 0.005 qualified ND 0.005 qualified barium 0.0001 0.05 qualified 0.0002 0.05 qualified nickel ND 0.002 qualified 0.0001 0.002 qualified antimony ND 0.0005 qualified ND 0.0005 qualified

[0041] Table 6. Data on leached substances from basalt ore (unit: mg / L)

[0042]

[0043]

[0044] Based on the characteristics of Wuyishan mineral water, the rocks were analyzed for their low calcium, low magnesium, and metasilicic acid mineralization. Tables 2, 3, 4, 5, and 6 show that biotite granodiorite porphyry, quartz diorite porphyry, granodiorite, biotite granite, tuff, and basalt have relatively high metasilicic acid content, making them suitable as raw materials for metasilicic acid mineralization. While quartz sandstone has a high silica content, its metasilicic acid precipitation is very low, making it unsuitable as a raw material for metasilicic acid mineralization. This is likely because its chemical composition cannot be converted from silica to metasilicic acid. Dolomite and limestone contain virtually no silica and cannot precipitate metasilicic acid, making them unsuitable as raw materials for metasilicic acid mineralization.

[0045] Based on calcium leaching levels, dolomite and limestone exhibit excessively high calcium leaching, making them unsuitable as raw materials for calcium mineralization. Biotite granodiorite porphyry, quartz sandstone, and tuff show excessively low calcium leaching, also unsuitable. Basalt has a relatively high calcium leaching level, potentially making it unsuitable. Quartz diorite porphyry, granodiorite, and biotite granite have suitable calcium leaching levels, making them suitable as raw materials for calcium mineralization.

[0046] From the perspective of magnesium precipitation, biotite granodiorite porphyry and dolomite have excessively high magnesium precipitation levels, making them unsuitable as raw materials for magnesium mineralization. Quartz sandstone and limestone have excessively low magnesium precipitation levels, making them unsuitable as raw materials for magnesium mineralization. Basalt has a relatively high magnesium precipitation level, potentially making it unsuitable as a raw material for magnesium mineralization. Quartz diorite porphyry, granodiorite, biotite granite, and tuff have suitable magnesium precipitation levels and are suitable as raw materials for magnesium mineralization.

[0047] From the perspective of potassium precipitation, biotite granodiorite porphyry has excessively high potassium precipitation and is unsuitable as a raw material for potassium mineralization. Quartz sandstone, dolomite, and limestone have excessively low potassium precipitation and are also unsuitable as raw materials for potassium mineralization. Quartz diorite porphyry, granodiorite, biotite granite, tuff, and basalt have suitable potassium precipitation and are suitable as raw materials for potassium mineralization.

[0048] Based on sodium precipitation, biotite granodiorite porphyry, quartz sandstone, dolomite, and limestone have too low sodium precipitation levels and are unsuitable as raw materials for sodium mineralization. Quartz diorite porphyry, granodiorite, biotite granite, tuff, and basalt have suitable sodium precipitation levels and are suitable as raw materials for sodium mineralization.

[0049] In addition, the biotite granodiorite porphyry exceeded the standards for heavy metals cadmium, aluminum, and iron; the quartz diorite porphyry, granodiorite, and biotite granite exceeded the standards for heavy metal aluminum; the heavy metal indicators of quartz sandstone, dolomite, and limestone were all within the acceptable range; and the heavy metal aluminum of tuff and basalt exceeded the standards.

[0050] Based on the data above, the availability of different rocks is shown in Table 7 below:

[0051] Table 7. Analysis of Availability of Different Rocks

[0052]

[0053] As shown in Table 7, only metasilicic acid in the biotite granodiorite porphyry meets the functional requirements, while potassium, calcium, sodium, and magnesium do not. Furthermore, the heavy metals cadmium, aluminum, and iron are all substandard. Therefore, biotite granodiorite porphyry cannot be selected as the rock for simulating Wuyishan mineral water.

[0054] Quartz sandstone, dolomite, and limestone all failed to meet the functional requirements. Although all heavy metal indicators were qualified, they could not be used as rocks to simulate Wuyishan mineral water.

[0055] The functional indicators of quartz diorite porphyry, granodiorite, and biotite granite all meet the requirements. Although the heavy metal aluminum does not meet the requirements, they can still be considered as rocks for simulating Wuyishan mineral water.

[0056] The tuff's functional indicators only failed to meet the requirements for calcium, while all others met the requirements. In terms of heavy metals, only aluminum failed to meet the requirements. Therefore, it can still be considered as a rock for simulating Wuyishan mineral water.

[0057] The functional indicators of basalt generally meet the requirements, with only aluminum failing to meet the heavy metal requirements. Therefore, it can still be considered as a rock for simulating Wuyishan mineral water.

[0058] Since the five candidate rocks—quartz diorite porphyry, granodiorite, biotite granite, tuff, and basalt—all exceeded the standard for heavy metal aluminum, it is necessary to address the issue of heavy metal aluminum. To avoid repetitive work, functional tests were first conducted on the above five rock materials:

[0059] 150g of 35-200 mesh quartz diorite porphyry powder, 150g of 35-200 mesh granodiorite powder, 150g of 35-200 mesh biotite granite powder, 150g of 35-200 mesh tuff powder, and 150g of 35-200 mesh basalt powder were respectively mixed with 170g of 80-325 mesh acid-washed coconut shell activated carbon powder and 170g of 80-325 mesh ultra-high molecular weight polyethylene powder. The mixtures were then placed into molds and pressed into shape. After firing at 200℃ for 2 hours, multiple mineralized carbon rods were obtained after demolding. These different mineralized carbon rods were assembled into a filter element. Pure water was continuously passed through the filter element at a constant temperature of 25℃±5℃ and a flow rate of 0.5L / min. The calcium, magnesium, sodium, potassium, and metasilicic acid content in the effluent was tested, as shown in Table 8.

[0060] Table 8. Data on substances precipitated by water passing through carbon rods from different rock mineralization processes (unit: mg / L)

[0061]

[0062] As shown in Table 8, the magnesium precipitation in biotite granite mineralized carbon rods is too low, the calcium precipitation in tuff mineralized carbon rods is zero, and the calcium precipitation in basalt mineralized carbon rods is too high. Therefore, biotite granite, tuff, and basalt are not suitable as rocks for simulating Wuyishan mineral water.

[0063] The potassium, calcium, sodium, and magnesium elements precipitated from the quartz diorite porphyry and granodiorite mineralized carbon rods all meet the water quality requirements of Wuyishan mineral water. Only the amount of metasilicic acid precipitated does not meet the requirements, but currently there are no rocks that meet the requirements for metasilicic acid, so they can be temporarily disregarded.

[0064] Based on the above conclusions, the only rocks currently suitable for simulating the water quality of Wuyishan mineral water are quartz diorite porphyry and granodiorite. However, two problems exist: firstly, the heavy metal aluminum exceeds the standard, and secondly, the amount of metasilicic acid precipitated is too low.

[0065] To reduce the aluminum content in quartz diorite porphyry and granodiorite, this invention employs a high-temperature atmosphere activation treatment method. To minimize the risk of introducing other heavy metals, high-temperature silica steam is used to activate the rocks.

[0066] 300g of 35-200 mesh quartz diorite porphyry powder was modified in a high-temperature steam atmosphere of different concentrations of silica. After treatment, the quartz diorite porphyry powder was taken out, rinsed three times with pure water, filtered and dried. 150g of quartz diorite porphyry powder was weighed and placed in 500mL of pure water, and soaked at a constant temperature of 25℃±5℃ for 24h. The supernatant was then taken to test the aluminum and metasilicic acid levels in the water, as shown in Table 9.

[0067] Table 9. Test data on quartz diorite porphyry modification

[0068]

[0069]

[0070] 300g of granodiorite powder (35-200 mesh) was modified for 30 minutes in a high-temperature steam atmosphere of silica of different concentrations. After treatment, the granodiorite powder was taken out, rinsed three times with pure water, filtered and dried. 150g of quartz diorite porphyry powder was weighed and placed in 300mL of pure water, and soaked at a constant temperature of 25℃±5℃ for 24 hours. The supernatant was then taken to test the aluminum and metasilicic acid levels in the water, as shown in Table 10.

[0071] Table 10. Test data on granodiorite modification

[0072] 0.5 mol / L 0.0486 mg / L 74.3 mg / L 1.0 mol / L 0.0423 mg / L 74.6 mg / L 1.5 mol / L 0.0345 mg / L 74.8 mg / L 1.8 mol / L 0.0253 mg / L 75.2 mg / L 2.3 mol / L 0.0214 mg / L 75.9 mg / L 2.5 mol / L 0.0183 mg / L 76.1 mg / L 3.0 mol / L 0.0179 mg / L 76.2 mg / L 3.2 mol / L 0.0132 mg / L 76.4 mg / L 3.5 mol / L 0.0112 mg / L 76.7 mg / L 4.0 mol / L 0.0105 mg / L 76.8 mg / L 4.5 mol / L 0.0101 mg / L 76.9 mg / L

[0073] Based on the data above, when the silica atmosphere concentration reaches 3.5 mol / L or higher, the aluminum precipitation in the soaking solution of quartz diorite porphyry and granodiorite decreases to approximately 0.1 mg / L. Further increases in silica atmosphere concentration do not significantly alter the aluminum precipitation. Therefore, for silica-modified high-temperature steam atmospheres, a silica atmosphere concentration of 3.5 mol / L to 4.5 mol / L is recommended, with a modification time preferably of 30 min.

[0074] After resolving the safety issues of aluminum precipitation from quartz diorite porphyry and granodiorite, it is also necessary to increase the concentration of metasilicic acid, a functional indicator of rock precipitation.

[0075] The inventors discovered that acid treatment can open up blind pores in rocks, and high-temperature treatment can change the dense structure of rocks and increase their porosity. Therefore, the two methods mentioned above were used to treat quartz diorite porphyry and granodiorite.

[0076] Acid treatment: 200g each of silica-modified 35-200 mesh quartz diorite porphyry and granodiorite materials were selected and soaked in 500mL of food-grade sodium citrate solution of different concentrations at a constant temperature of 25℃±5℃ for 24h. After soaking, the quartz diorite porphyry and granodiorite materials were filtered out, rinsed 5 times with pure water, and then filtered and dried. Then, 150g of 35-200 mesh quartz diorite porphyry powder and 150g of 35-200 mesh granodiorite powder, treated with silica and food-grade sodium citrate solution respectively, were mixed with 170g of 80-325 mesh acid-washed coconut shell activated carbon powder and 170g of 80-325 mesh ultra-high molecular weight polyethylene powder, respectively. These mixtures were then pressed into molds and fired at 200℃ for 2 hours. After demolding, different mineralized carbon rods were obtained. These different mineralized carbon rods were assembled into filter elements, and pure water was continuously passed through them at a constant temperature of 25℃±5℃ and a flow rate of 0.5L / min. The metasilicic acid content of the effluent (unit: mg / L) was tested, as shown in Table 11.

[0077] Table 11. Test data on modification of food-grade sodium citrate solution

[0078] 0.5 mol / L 13.1 14.8 1.0 mol / L 13.4 15.1 1.5 mol / L 13.8 15.6 2.0 mol / L 14.3 15.9 2.5 mol / L 14.5 16.5 3.0 mol / L 14.7 16.7 3.5 mol / L 15.2 17.2 4.0 mol / L 15.3. 17.4 4.5 mol / L 15.3 17.4 5.0 mol / L 15.4 17.5

[0079] Based on the data above, when the concentration of food-grade sodium citrate solution reaches 4.0 mol / L or higher, the increase in metasilicic acid precipitation from the mineralized carbon rods of quartz diorite porphyry and granodiorite becomes slower. Therefore, the recommended concentration of food-grade sodium citrate solution for modification is 4.0 mol / L to 5.0 mol / L, at a constant temperature of 25℃±5℃, and the preferred modification time is 24 hours.

[0080] High-temperature treatment: Take 1500g of 35-200 mesh quartz diorite porphyry powder and divide it evenly into 10 portions; take 1000g of 35-200 mesh granodiorite powder and divide it evenly into 10 portions. Place each of the 10 portions of powder from the two rocks into multiple muffle furnaces, and adjust the temperature of the muffle furnaces to different temperatures: 350℃, 400℃, 450℃, 500℃, 550℃, 600℃, 650℃, 700℃, 750℃, and 800℃, and treat for 3 hours. Then cool to room temperature and remove. High-temperature modified 35-200 mesh quartz diorite porphyry powder and high-temperature modified 35-200 mesh granodiorite powder were respectively mixed with 170g of 80-325 mesh acid-washed coconut shell activated carbon powder and 170g of 80-325 mesh ultra-high molecular weight polyethylene powder, respectively. The mixtures were then pressed into molds and fired at 200℃ for 2 hours. After demolding, different mineralized carbon rods were obtained. These different mineralized carbon rods were assembled into filter elements, and pure water was continuously passed through them at a constant temperature of 25℃±5℃ and a flow rate of 0.5L / min. The metasilicic acid content (unit: mg / L) of the effluent was tested, as shown in Table XII.

[0081] Table 12. High-Temperature Modification Test Data at Different Temperatures

[0082] 350℃ 15.3 17.4 400℃ 16.7 18.6 450℃ 18.9 21.4 500℃ 22.3 26.3 550℃ 24.6 28.2 600℃ 28.4 32.4 650℃ 32.5 35.3 700℃ 35.2 38.1 750℃ 34.2 37.9 800℃ 33.9 36.7

[0083] Based on the data above, the highest metasilicic acid precipitation in mineralized carbon rods of quartz diorite porphyry and granodiorite is observed at temperatures between 650 and 700℃. Therefore, a temperature of 650–700℃ is recommended for high-temperature modification, with a modification time preferably of 3 hours.

[0084] In summary, the inventors have developed the following filter cartridge for preparing drinking water that simulates the groundwater quality of Wuyi Mountain:

[0085] By weight, the raw materials include: 120-180 parts modified rock, 150-190 parts activated carbon, and 150-190 parts binder; wherein the rock includes one or more of quartz diorite porphyry and granodiorite. The weight parts of the modified rock can be, for example, 125 parts, 130 parts, 134 parts, 150 parts, 155 parts, 162 parts, 174 parts, or 179 parts; the weight parts of the activated carbon can be, for example, 158 parts, 164 parts, 170 parts, 175 parts, 181 parts, or 188 parts; and the weight parts of the binder can be, for example, 160 parts, 165 parts, 171 parts, 177 parts, or 185 parts.

[0086] In some embodiments, the raw materials preferably include, by weight parts: 140-160 parts modified rock, 160-180 parts activated carbon, and 160-180 parts binder. The weight parts of the modified rock can be, for example, 142, 145, 151, 154, or 157 parts; the weight parts of the activated carbon can be, for example, 161, 167, 172, 175, or 178 parts; and the weight parts of the binder can be, for example, 163, 168, 172, 176, or 179 parts.

[0087] In some embodiments, the raw materials more preferably include, by weight, 150 parts modified rock, 170 parts activated carbon, and 170 parts binder.

[0088] The weight proportions of the three raw materials mentioned above indicate the ratio between them. The specific amount to be used can be calculated according to actual needs. For example, the raw materials may include 12-18g of modified rock, 15-19g of activated carbon, and 15-19g of binder; the raw materials may also include 150g of modified rock, 170g of activated carbon, and 170g of binder; the unit of measurement may also be kilograms, etc.

[0089] In some embodiments, the modified rock is 35-200 mesh rock powder, the activated carbon is 80-325 mesh activated carbon powder, and the binder is 80-325 mesh ultra-high molecular weight polyethylene powder. In other embodiments, the raw materials may also be particles with larger mesh sizes or smaller microparticles.

[0090] In some embodiments, the activated carbon is acid-washed coconut shell activated carbon. Acid washing can remove heavy metal components naturally present in the activated carbon, improving its safety. Acid washing can be achieved using hydrochloric acid.

[0091] Regarding the modification treatment of modified rocks, in order to reduce the heavy metal aluminum content of the rocks, in some embodiments, the modification treatment of modified rocks may include: placing the rocks in a silica vapor atmosphere. Further, the concentration of silica vapor is 3.5 mol / L to 4.5 mol / L, for example, 3.8 mol / L, 4.0 mol / L, or 4.3 mol / L; the standing time is 20 to 40 minutes, for example, 25 minutes, 30 minutes, 32 minutes, or 36 minutes. When the rock is in powder form, the rock powder is placed in a silica vapor atmosphere. The amount of rock powder used can be selected according to specific circumstances. In experimental cases, the amount used is generally smaller, for example, 50g, 200g, 300g, or 500g; in industrial production, the amount used is generally larger, for example, 2kg, 5kg, or 10kg.

[0092] Furthermore, after modification in a high-temperature steam atmosphere of silica, the rock / rock powder can be removed, rinsed with water 2-4 times, and then filtered and dried. The water can be purified water, ultrapure water, etc., and the preferred number of rinsing times is 3. The drying temperature can be 180-200℃, and the drying time can be 6-8 hours.

[0093] To open up the blind pores in the rock, in some embodiments, the modification treatment of the rock may include: immersing the rock in a food-grade sodium citrate solution. Further, the concentration of the food-grade sodium citrate solution is 4.0 mol / L to 5.0 mol / L, for example, 4.2 mol / L, 4.5 mol / L, or 4.7 mol / L; the immersion time is 20 to 28 hours, for example, 23 hours, 24 hours, 25 hours, or 26 hours; and the solvent for the food-grade sodium citrate solution is water.

[0094] In some embodiments, the temperature of the food-grade sodium citrate solution is 20–30°C, preferably a constant temperature condition.

[0095] The soaking volume of the rock material and the amount of food-grade sodium citrate solution used can be selected according to specific circumstances. The soaking volume of the rock material can be, for example, 40g, 200g, 350g, or 500g, or for example, 2kg, 5kg, or 10kg; the amount of food-grade sodium citrate solution used can be, for example, 300mL, 500mL, or 800mL, or for example, 3L, 5L, or 10L. Preferably, 200g of rock material is soaked in 500mL of food-grade sodium citrate solution.

[0096] Furthermore, after soaking in a food-grade sodium citrate solution, the rock material can be filtered out, rinsed with water 3 to 7 times, and then filtered and dried. The water can be purified water, ultrapure water, etc., and the preferred number of rinsing times is 5. The drying temperature can be 180 to 200°C, and the drying time can be 6 to 8 hours.

[0097] To alter the dense structure of rocks and increase their porosity, in some embodiments, the modification process may include allowing the rocks to stand at 650°C–700°C for 2–4 hours. This process can be performed using a muffle furnace, with the furnace temperature adjusted to 650°C–700°C, and the rocks treated for 3 hours before being cooled to room temperature and removed. Similarly, the amount of rock material used can be selected based on specific circumstances.

[0098] Furthermore, the modification treatment of the modified rock preferably includes, in sequence, the above-mentioned silica steam treatment, the food-grade sodium citrate solution soaking treatment, and the high-temperature treatment at 650℃~700℃.

[0099] In addition, the present invention also provides a method for preparing the above-mentioned filter element for drinking water that simulates the groundwater quality of Wuyi Mountain, comprising:

[0100] Provide raw materials; by weight, the raw materials include 120-180 parts of modified rock, 150-190 parts of activated carbon, and 150-190 parts of binder, wherein the rock includes one or more of quartz diorite porphyry and granodiorite;

[0101] The raw materials are mixed, pressed into shape, sintered, and assembled.

[0102] Furthermore, the preparation method of the filter element may include: loading the mixed powder (raw material) into a mold and pressing it into shape, firing it at 200℃ for 2 hours, and after demolding, obtaining a mineralized carbon rod (quartz diorite porphyry formula or granodiorite formula) that simulates the water quality of Wuyishan mineral water. The size can be 65mm×32mm×215mm. The mineralized carbon rod can be assembled into a filter element with a filter shell.

[0103] Example 1

[0104] This embodiment provides a filter element for drinking water that simulates the groundwater quality of Wuyi Mountain, including a mineralized carbon rod. By weight, the raw materials of the mineralized carbon rod include: 150 parts of 100-mesh modified quartz diorite porphyry powder, 170 parts of 200-mesh acid-washed coconut shell activated carbon powder, and 170 parts of 200-mesh ultra-high molecular weight polyethylene powder.

[0105] The modification treatment of the above-mentioned quartz diorite porphyry powder includes:

[0106] Place 300g of quartz diorite porphyry powder in a silica vapor atmosphere of 4.0mol / L for 30min. Then remove the quartz diorite porphyry powder, rinse it three times with pure water, filter and dry it.

[0107] Take 200g of quartz diorite porphyry powder and soak it in 500mL of food-grade sodium citrate solution at a constant temperature of 25℃ and a concentration of 4.5mol / L for 24h. After soaking, filter out the quartz diorite porphyry powder, rinse it 5 times with pure water, and then filter and dry it.

[0108] 150g of quartz diorite porphyry powder was placed in a muffle furnace, the temperature of the muffle furnace was adjusted to 680℃, and after treatment for 3 hours, it was cooled to room temperature and taken out to obtain modified quartz diorite porphyry powder.

[0109] To verify the stability of the product, a sanitary safety test and a functional test were conducted on the mineralized carbon rod (quartz diorite porphyry formula) that simulates the water quality of Wuyishan mineral water.

[0110] Hygiene and safety test: A large T-sized filter cartridge with a filter shell was assembled using mineralized carbon rods (quartz diorite porphyry formula) simulating the quality of Wuyishan mineral water. The cartridge was then rinsed for 30 minutes using a pure water machine (TDS < 5). The water in the filter cartridge was then drained. A soaking solution was prepared according to Appendix A of the "Hygiene and Safety Evaluation Standard for Drinking Water Transmission and Distribution Equipment and Protective Materials" (2001), and the filter cartridge was rinsed with the soaking solution (flow rate 1.5 L / min) for 30 seconds (timing started after water flow from the filter cartridge). The inlet and outlet water switches of the filter cartridge were then turned off. The container was then placed in an environment at 25℃ and soaked for 24 hours. The outlet water switch of the filter cartridge was then opened, and the soaking water in the filter cartridge was collected for a hygiene and safety test. The test results are shown in Table XIII.

[0111]

[0112]

[0113] Table 13. Hygiene and Safety Immersion Test Results of Mineralized Carbon Rods (Quartz Diorite Porphyry Formula) Simulating Wuyishan Mineral Water Quality

[0114] Functional testing of a mineralized filter cartridge (quartz diorite porphyry formula) simulating Wuyishan mineral water quality: The mineralized filter cartridge (quartz diorite porphyry formula) simulating Wuyishan mineral water quality was assembled into a large T-sized filter cartridge with a filter shell. A pure water machine (TDS < 5) was connected, and 10L of water was flushed through it. Pure water was continuously passed through at a constant temperature of 25℃ and a flow rate of 0.5L / min. The levels of metasilicic acid, potassium, calcium, sodium, magnesium, and other minerals in the effluent were tested. Test results are shown in Table XIV.

[0115] Table 14. Continuous water flow effect of mineralized filter cartridges (quartz diorite porphyry formula) simulating Wuyishan mineral water quality (unit: mg / L)

[0116]

[0117] Based on the test results in Tables 13 and 14, it can be seen that the mineralized filter element (quartz diorite porphyry formula) simulating Wuyishan mineral water quality provided in this embodiment fully meets the hygiene and safety requirements, has no excessive heavy metals, and exhibits good uniformity. The functional indicators of potassium, sodium, calcium, magnesium, and metasilicic acid all meet the requirements for Wuyishan mineral water quality. Therefore, the effluent quality obtained using the above filter element (quartz diorite porphyry formula) meets the requirements for Wuyishan mineral water quality. Furthermore, the preparation method of the filter element involved in this embodiment is simple and suitable for large-scale production.

[0118] Example 2

[0119] The filter element provided in this embodiment is largely the same as that in Embodiment 1, except that: the quartz diorite porphyry powder is replaced with granodiorite powder; and in the silica steam treatment, 200g of granodiorite powder is placed in a silica steam atmosphere.

[0120] Hygiene and safety tests and functional tests were conducted on mineralized carbon rods (granodiorite formula) that simulate the water quality of Wuyishan mineral water.

[0121] Hygiene and safety test: A large T-sized filter cartridge with a filter shell was assembled using mineralized carbon rods (granodiorite formula) simulating the quality of Wuyishan mineral water. The cartridge was then rinsed for 30 minutes using a pure water machine (TDS < 5). The water in the filter cartridge was then drained. A soaking solution was prepared according to Appendix A of the "Hygiene and Safety Evaluation Standard for Drinking Water Transmission and Distribution Equipment and Protective Materials" (2001), and the filter cartridge was rinsed with the soaking solution (flow rate 1.5 L / min) for 30 seconds (timing started after water flow from the filter cartridge). The inlet and outlet water switches of the filter cartridge were then turned off. The container was then placed in an environment at 25℃ and soaked for 24 hours. Afterward, the outlet water switch of the filter cartridge was opened, and the soaking water from the filter cartridge was collected for a hygiene and safety test. The test results are shown in Table 15.

[0122] Table 15. Hygiene and Safety Immersion Test Results of Mineralized Carbon Rods (Granodioite Formula) Simulating Wuyishan Mineral Water Quality

[0123]

[0124]

[0125] Functional testing of a mineralized filter cartridge (granodiorite formula) simulating Wuyishan mineral water quality: The mineralized filter cartridge (granodiorite formula) simulating Wuyishan mineral water quality was assembled into a large T-sized filter cartridge with a filter shell. A pure water machine (TDS < 5) was connected, and 10L of water was flushed through it. Pure water was continuously passed through at a constant temperature of 25℃ and a flow rate of 0.5L / min. The levels of metasilicic acid, potassium, calcium, sodium, magnesium, and other minerals in the effluent were tested. Test results are shown in Table 16.

[0126] Table 16. Continuous water flow effect of mineralized filter cartridge (granodiorite formula) simulating Wuyishan mineral water quality (unit: mg / L)

[0127]

[0128] Based on the test results in Tables 15 and 16, it can be seen that the mineralized filter element (granodiorite formula) simulating Wuyishan mineral water quality provided in this embodiment fully meets the hygiene and safety requirements, has no excessive heavy metals, and exhibits good uniformity. The functional indicators of potassium, sodium, calcium, magnesium, and metasilicic acid all meet the requirements for Wuyishan mineral water quality. Therefore, the effluent quality obtained using the above filter element (granodiorite formula) conforms to the Wuyishan mineral water quality standards.

[0129] Example 3

[0130] This embodiment provides a drinking water filter element that simulates the groundwater quality of Wuyi Mountain. By weight, the raw materials include: 130 parts of 50-mesh modified quartz diorite porphyry powder, 160 parts of 100-mesh acid-washed coconut shell activated carbon powder, and 155 parts of 90-mesh ultra-high molecular weight polyethylene powder.

[0131] The modification treatment of the above-mentioned quartz diorite porphyry powder includes:

[0132] Place 300g of quartz diorite porphyry powder in a silica vapor atmosphere of 3.5mol / L for 40min. Then remove the quartz diorite porphyry powder, rinse it three times with pure water, filter and dry it.

[0133] Take 200g of quartz diorite porphyry powder and soak it in 500mL of food-grade sodium citrate solution at a constant temperature of 23℃ and a concentration of 4.0mol / L for 28h. After soaking, filter out the quartz diorite porphyry powder, rinse it 5 times with pure water, and then filter and dry it.

[0134] 150g of quartz diorite porphyry powder was placed in a muffle furnace, the temperature of the muffle furnace was adjusted to 700℃, and the powder was treated for 2.5h. After cooling to room temperature, the powder was removed to obtain modified quartz diorite porphyry powder.

[0135] Example 4

[0136] This embodiment provides a drinking water filter element that simulates the groundwater quality of Wuyi Mountain. By weight, the raw materials include: 170 parts of 200-mesh modified granodiorite powder, 180 parts of 300-mesh acid-washed coconut shell activated carbon powder, and 180 parts of 300-mesh ultra-high molecular weight polyethylene powder.

[0137] The modification treatment of the above-mentioned granodiorite powder includes:

[0138] Place 200g of granodiorite powder in a silica vapor atmosphere of 4.5mol / L for 25min. Then remove the granodiorite powder, rinse it three times with pure water, filter and dry it.

[0139] Take 200g of granodiorite powder and soak it in 500mL of food-grade sodium citrate solution at a constant temperature of 30℃ and a concentration of 5.0mol / L for 21h. After soaking, filter out the granodiorite powder, rinse it 5 times with pure water, and then filter and dry it.

[0140] 150g of granodiorite powder was placed in a muffle furnace, the temperature of the muffle furnace was adjusted to 650℃, and after treatment for 4 hours, it was cooled to room temperature and taken out to obtain modified granodiorite powder.

[0141] The water quality data of the water obtained by comparing the filter cartridges provided in Examples 1-2 with that of existing mineral water are as follows:

[0142] Table 17 Water Quality Comparison (Unit: mg / L)

[0143]

[0144]

[0145] The data above shows that the mineralized filter element (quartz diorite porphyry formula and granodiorite formula) that simulates the mineral water quality of Wuyishan Mountain provided by this invention produces water that fully meets the requirements of Wuyishan Mountain mineral water quality, is beneficial to human health, has a low degree of mineralization, and has a soft taste, making it particularly suitable for brewing tea.

[0146] The technical solutions provided by the embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A filter element for drinking water that simulates the groundwater quality of Wuyi Mountain, characterized in that, By weight, the raw materials include: 120-180 parts of modified rock, 150-190 parts of activated carbon, and 150-190 parts of binder; wherein, the rock includes one or more of quartz diorite porphyry and granodiorite, and the modification treatment of the modified rock includes: placing the rock in a silica vapor atmosphere, immersing it in a food-grade sodium citrate solution, and standing it at a temperature of 650℃-700℃ for 2-4 hours.

2. The filter element according to claim 1, characterized in that, By weight, the raw materials include: 140-160 parts modified rock, 160-180 parts activated carbon, and 160-180 parts binder.

3. The filter element according to claim 1, characterized in that, The modified rock is 35-200 mesh rock powder, the activated carbon is 80-325 mesh activated carbon powder, and the binder is 80-325 mesh ultra-high molecular weight polyethylene powder.

4. The filter element according to claim 1, characterized in that, The concentration of the silica vapor is 3.5 mol / L to 4.5 mol / L, and the settling time is 20 to 40 minutes.

5. The filter element according to claim 1, characterized in that, The concentration of the food-grade sodium citrate solution is 4.0 mol / L to 5.0 mol / L, and the soaking time is 20 to 28 hours.

6. The filter element according to claim 1, characterized in that, The temperature of the food-grade sodium citrate solution is 20~30℃.

7. A method for preparing a drinking water filter element simulating the groundwater quality of Wuyi Mountain as described in any one of claims 1 to 6, characterized in that, include: Provide raw materials; By weight, the raw materials include 120-180 parts of modified rock, 150-190 parts of activated carbon, and 150-190 parts of binder, wherein the rock includes one or more of quartz diorite porphyry and granodiorite. The raw materials are mixed, pressed into shape, sintered, and assembled.

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