Preparation method of functional mineral water based on graded activated medical stone

Abstract

The invention discloses a preparation method of functional mineral water based on graded activated medical stone, which comprises the following steps: 1) graded pretreatment of medical stone: selecting high-purity caesious medical stone, crushing, screening three-level granularity: 2-3mm level, 0.5-1mm level and 80-100 mesh level, and then respectively carrying out washing impurity removal, blast drying and low-temperature activation; (2) setting up a multi-stage synergistic mineralization device: adopting a mineralization column made of 304 stainless steel, arranging flow guide partition plates with holes alternately in the mineralization column, and filling 2-3mm, 0.5-1mm and 80-100-mesh graded pretreated medical stones from top to bottom to achieve the functions of first-stage impurity removal, second-stage adsorption and third-stage dissolution; 3) precise mineralization control: after being pretreated by a sedimentation tank, raw water is fed into a mineralization column, the temperature and the total contact time are controlled, regional retention is realized, and the functional mineral water is obtained through 0.22 [mu] m precise filtration and pH regulation of effluent. The preparation method has the characteristics of excellent purification and dissolution performance, improved efficiency and stability, and optimized resources and cost.

Description

Technical Field

[0001] This invention relates to the field of drinking water preparation technology, and specifically to a method for preparing functional mineral water based on graded activated maifanite. Background Technology

[0002] Water is the source of life and the foundation of health. It is the basis for the survival of humans, animals, and plants; without water, there is no life. Water is directly related to aging, immunity, and lifespan; the quality of water determines health. Mineral water is highly sought after because it contains minerals essential for the human body.

[0003] Maifan stone is a natural silicate mineral that is non-toxic, harmless, and possesses certain biological activity. Its main chemical components are inorganic aluminosilicates, including SiO2, Al2O3, Fe2O3, FeO, MgO, CaO, K2O, Na2O, TiO2, P2O5, and MnO. It also contains all the essential macroelements required by animals, such as K, Na, Ca, Mg, Cu, Mo, and other trace elements and rare earth elements, totaling approximately 58 kinds.

[0004] Maifan stone can dissolve more than 30 kinds of mineral elements beneficial to human health in water. These dissolved elements are highly active and easily absorbed by the human body, making it a comprehensive and complete inorganic nutrient solution. Maifan stone can adsorb, decompose, and remove various harmful substances, such as amines, mercury, chlorine, cadmium, cyanide, Staphylococcus aureus, bacteria, and various pathogens. Maifan stone also has a strong adsorption effect on heavy metal ions (Pb, Hg, Cr, Cd, As), organic matter, viruses, and other harmful substances in water, with an adsorption rate of over 95% for E. coli. Therefore, research on water purification through the mineralization of maifan stone has a long history.

[0005] Existing technologies for preparing maifanite mineral water mainly revolve around three main directions: "rapid dissolution," "utilization of natural spring water," and "equipment-based production." Specifically, regarding rapid dissolution technology, for example, Chinese patent CN1171806C discloses a method using an aqueous solution of acesalicic acid as a solvent. Maifanite powder of 300 mesh or finer is mixed with acesalicic acid at a ratio of 0.485g:0.015g, and then 250mL of purified water is added, producing mineral water in 5 minutes. The mixture can also be made into concentrated tablets for easy portability. The core principle is to accelerate mineral dissolution through a chemical solvent. However, this patented technology relies on the chemical solvent of acesalicic acid to accelerate dissolution. While this shortens the time, it introduces exogenous chemical substances, potentially affecting taste and posing long-term safety risks. Furthermore, it does not address the adsorption capacity for heavy metals, resulting in an insufficient balance between dissolution and safety. Additionally, while fine powder dissolves quickly, it is prone to clogging, leading to resource waste.

[0006] Regarding natural spring water mineralization technology, for example, Chinese patent CN1209968A proposes using natural maifanite spring water from Pingdingshan, Naiman Banner, Inner Mongolia. This water is filtered through a maifanite particle filter layer, sterilized, and then packaged. Alternatively, it involves static soaking after high-speed dynamic stirring to pulverize the maifanite, relying on natural maifanite water sources and simple physical treatment. However, this patented technology depends on natural spring water, is highly geographically limited, and lacks particle size control during artificial soaking; 300-mesh fine powder easily leads to water turbidity.

[0007] In terms of modular mineralization technology, for example, Chinese patent CN203173932U designs a production line device consisting of "maifan stone sedimentation tank - storage tank - filtration tank (maifan stone + activated carbon blocks) - electric heating auxiliary tank - index testing tank," which achieves mineralization through heating and multi-stage tanks. However, its mineral dissolution fluctuates by ±18%, resulting in low mineralization stability and low resource utilization. The adsorption capacity of block maifan stone is only utilized by 60% before replacement, causing resource waste. Chinese patent CN87211620U uses a shell made of clay and maifan stone powder as its core, with an internal electric heater to boil maifan stone blocks and water to produce water, focusing on small-scale household equipment. However, its mineralization efficiency is low, and the amount of water produced at one time only meets personal needs. Moreover, the boiling process easily leads to the volatilization and loss of some minerals (such as selenium).

[0008] Therefore, it is still necessary to develop a new method for preparing functional mineral water using maifanite, taking into account issues related to purification and dissolution performance, efficiency and stability, and resources and costs. Summary of the Invention

[0009] To address the problems existing in the prior art, this invention provides a method for preparing functional mineral water based on graded activation of maifanite, which features superior purification and dissolution performance, improved efficiency and stability, and optimized resources and costs.

[0010] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0011] A method for preparing functional mineral water based on graded activated maifanite includes the following steps:

[0012] 1) Maifan stone grading pretreatment: Select pure bluish-gray maifan stone, crush it and screen it into three particle sizes: 2-3mm (30-40%), 0.5-1mm (35-40%), and 80-100 mesh (25-30%). Then, wash it with water to remove impurities, dry it with forced air and activate it at low temperature.

[0013] 2) Multi-stage synergistic mineralization device construction: The mineralization column is made of stainless steel and is equipped with alternating perforated flow guide baffles. It is filled from top to bottom with 2-3mm, 0.5-1mm and 80-100 mesh maifanite pre-treated in step 1), which plays the role of primary impurity removal, secondary adsorption and tertiary leaching.

[0014] 3) Precise mineralization control: After the raw water is pretreated in the sedimentation tank, it is sent to the mineralization column in step 2). The temperature and total contact time are controlled to achieve regional retention. The effluent is filtered through a precision filter of at least 0.22μm and the pH is adjusted to obtain functional mineral water.

[0015] In one specific implementation scheme, the high-purity bluish-gray maifanite described in step 1) contains SiO2 ≥ 65wt% and Al2O3 ≤ 15wt%.

[0016] In one specific implementation, the forced-air drying in step 1) is forced-air drying at 105°C until the moisture content is ≤1wt%; the low-temperature activation is low-temperature activation at 200-250°C for at least 2-3 hours.

[0017] In one specific implementation, the mineralization column in step 2) has an inner diameter of 500-600 mm and a height of 2000-2500 mm.

[0018] In one specific implementation, in step 2), the mineralization column is equipped with at least 4 alternating perforated flow guide baffles. Preferably, the diameter of the perforations is 10-15 mm and the spacing between the perforations is 50-60 mm.

[0019] In one specific implementation, the raw water described in step 3) is pretreated in a sedimentation tank until the turbidity is ≤5 NTU.

[0020] In one specific implementation, the flow rate of the raw water entering the mineralization column in step 3) is 0.8-1.0 L / min·L.

[0021] In one specific implementation, step 3) controls the temperature to 25-30°C and the total contact time to 90-150 minutes.

[0022] In a specific implementation plan, the time for each zone in step 3) is as follows: 40-50 minutes for primary impurity removal, 30-40 minutes for secondary adsorption, and 20-30 minutes for tertiary dissolution.

[0023] In one specific implementation, in step 3), the pH is stabilized at 7.5-8.5 and the concentration of positively hydrated ions is 2.8-3.5 mg / L by fine-tuning the flow rate, thus obtaining functional mineral water that meets the GB 8537-2018 standard.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1) Excellent in both purification and dissolution: for Pb 2+ Hg 2+ The removal rates reached 99.2% and 98.8%, far exceeding the 85% of the existing technology CN203173932U; Ca 2+(35-50 mg / L), Mg 2+ (15-20mg / L) It dissolves stably, with no chemical solvent residue as described in the existing technology CN1171806C, and has a sweet taste.

[0026] 2) Improved efficiency and stability: The mineralization cycle is 1.5-2.5 hours, which is 60% shorter than the actual production cycle of the existing technology CN1171806C (although it dissolves in 5 minutes, concentrated tablets need to be prepared in advance) and 50% shorter than the existing technology CN203173932U; the product qualification rate is over 99%, and the fluctuation is ≤3%.

[0027] 3) Resource and cost optimization: The replacement cycle of maifanite is 1.5 years, which is 150% longer than the 6 months of the existing technology CN203173932U. The adsorption capacity utilization rate is 95%, the amount of waste stone is reduced by 60%, no chemical solvents are required, and the overall cost is reduced by 25%. Detailed Implementation

[0028] To make the technical problem to be solved by the present invention, the technical solution, and the beneficial effects clearer, the present invention will be further described in detail below. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0029] The present invention discloses a method for preparing functional mineral water based on graded activated maifanite, comprising the following steps:

[0030] 1) Maifan stone grading and pretreatment process:

[0031] High-purity bluish-gray maifanite was selected (referencing existing technology CN1209968A for the selection of high-quality maifanite origin, SiO2≥65%, Al2O3≤15%), and after crushing, it was screened into three particle sizes: 2-3mm (40%), 0.5-1mm (35%), and 80-100 mesh (25%). The three particles were then washed with water to remove impurities, dried at 105℃ with forced air (moisture content≤1%), and activated at 200℃ for 2 hours.

[0032] The grading and pretreatment process for maifanite using the present invention avoids the clogging problem of single fine powder in the prior art CN1171806C and the inefficiency problem of blocky material in the prior art CN203173932U. Simultaneously, the low-temperature activation process of the present invention, compared to the high-temperature boiling of the prior art CN203173932U, can retain heat-sensitive elements such as selenium and zinc, increase porosity to 45-50%, and improve adsorption capacity by 30%.

[0033] The graded activation process of this invention solves the problems of "fine powder clogging / lumpy inefficiency" and "high temperature deactivation" in existing technologies by combining three-level particle size with low-temperature activation, and achieves precise matching of adsorption and dissolution.

[0034] 2) Design of multi-stage synergistic mineralization unit:

[0035] The mineralization column is made of 304 stainless steel (avoiding the problem of easy breakage of the existing technology CN87211620U clay shell), with an inner diameter of 500mm and a height of 2000mm. It is equipped with 4 alternating perforated flow guide baffles (10mm aperture, 50mm spacing between holes), and is filled with 2-3mm (primary impurity removal), 0.5-1mm (secondary adsorption), and 80-100 mesh (tertiary leaching) maifanite from top to bottom, which can realize reverse water flow osmosis.

[0036] The reverse flow guiding device for the mineralization column of the present invention adopts an alternating perforated baffle design to ensure full contact between the water flow and the maifanite, which can avoid the problem of "dead water zone" in the prior art CN203173932U and improve the uniformity of mineralization; at the same time, the contact efficiency is increased by 40%.

[0037] 3) Precision mineralization control process:

[0038] After pretreatment in a sedimentation tank (turbidity ≤ 5 NTU), the raw water is fed into a mineralization column at a flow rate of 0.8-1.0 L / min·L, with the temperature controlled at 25-30℃ and the total contact time at 90-150 minutes. The water is then separated into different zones for retention (first-stage impurity removal 40-50 minutes, second-stage adsorption 30-40 minutes, and third-stage leaching 20-30 minutes).

[0039] The effluent is filtered through a 0.22μm precision filter, and the pH is stabilized at 7.5-8.5 by fine-tuning the flow rate, with a positive hydrate ion concentration of 2.8-3.5mg / L, resulting in functional mineral water that meets the GB 8537-2018 standard.

[0040] The precise mineralization control process of this invention realizes multi-parameter linkage control. By linking flow rate, temperature, contact time and water quality indicators, it solves the problems of "natural water source dependence" in the existing technology CN1209968A and "chemical residue" in the existing technology CN1171806C, achieves stable mass production, and avoids the problem of fine powder turbidity.

[0041] In this invention, processes not specifically described can refer to existing technologies, such as crushing, screening, washing and impurity removal of maifanite, and treating raw water to a turbidity of ≤5 NTU, all of which can be achieved using conventional technical means in this field.

[0042] Unless otherwise specified, the detection methods described in this invention employ conventional detection methods in the field, such as the corresponding detection methods specified in GB8537-2018.

[0043] The present invention will be further explained and illustrated below through more specific embodiments, but these do not constitute any limitation.

[0044] Example 1

[0045] 1) Select high-purity bluish-gray maifanite (SiO2≥65%, Al2O3≤15%), crush it and screen it into three particle sizes: 2-3mm (40%), 0.5-1mm (35%), and 80-100 mesh (25%). Then wash the three particles with water to remove impurities, dry them at 105℃ with forced air (moisture content≤1%), and activate them at 200℃ for 2 hours.

[0046] 2) The mineralization column is made of stainless steel with an inner diameter of 500mm and a height of 2000mm. It is filled with four alternating perforated flow guide baffles (10mm aperture and 50mm spacing between holes). From top to bottom, it is filled with 2-3mm (primary impurity removal), 0.5-1mm (secondary adsorption), and 80-100 mesh (tertiary leaching) maifanite.

[0047] 3) After the raw water is pretreated in the sedimentation tank (turbidity ≤ 5 NTU), it is fed into the mineralization column at a flow rate of 0.8 L / min·L, the temperature is controlled at 30℃, the total contact time is 90 minutes, and the water is separated into different zones (40 minutes for primary impurity removal, 30 minutes for secondary adsorption, and 20 minutes for tertiary leaching).

[0048] The water is filtered through a 0.22μm precision filter, and the pH is stabilized at 7.5 by fine-tuning the flow rate, with a positive hydrated ion concentration of 3.5mg / L, resulting in functional mineral water that meets the GB 8537-2018 standard.

[0049] Example 2

[0050] 1) Select high-purity bluish-gray maifanite (SiO2≥65%, Al2O3≤15%), crush it and screen it into three particle sizes: 2-3mm (40%), 0.5-1mm (35%), and 80-100 mesh (25%). Then wash the three particles with water to remove impurities, dry them at 105℃ with forced air (moisture content≤1%), and activate them at 200℃ for 2-3 hours.

[0051] 2) The mineralization column is made of stainless steel with an inner diameter of 500mm and a height of 2000mm. It is filled with four alternating perforated flow guide baffles (10mm aperture and 50mm spacing between holes). From top to bottom, it is filled with 2-3mm (primary impurity removal), 0.5-1mm (secondary adsorption), and 80-100 mesh (tertiary leaching) maifanite.

[0052] 3) After pretreatment in a sedimentation tank (turbidity ≤ 5 NTU), the raw water is fed into the mineralization column at a flow rate of 0.9 L / min·L, with the temperature controlled at 25℃ and a total contact time of 100 minutes. The water is then separated into different zones (45 minutes for primary impurity removal, 35 minutes for secondary adsorption, and 20 minutes for tertiary leaching).

[0053] The effluent is filtered through a 0.22μm precision filter, and the pH is stabilized at 8.0 by fine-tuning the flow rate, with a positive hydrated ion concentration of 3.1mg / L, resulting in functional mineral water that meets the GB 8537-2018 standard.

[0054] Example 3

[0055] 1) Select high-purity bluish-gray maifanite (SiO2≥65%, Al2O3≤15%), crush it and screen it into three particle sizes: 2-3mm (40%), 0.5-1mm (35%), and 80-100 mesh (25%). Then wash the three particles with water to remove impurities, dry them at 105℃ with forced air (moisture content≤1%), and activate them at 200℃ for 2-3 hours.

[0056] 2) The mineralization column is made of stainless steel with an inner diameter of 500mm and a height of 2000mm. It is filled with four alternating perforated flow guide baffles (10mm aperture and 50mm spacing between holes). From top to bottom, it is filled with 2-3mm (primary impurity removal), 0.5-1mm (secondary adsorption), and 80-100 mesh (tertiary leaching) maifanite.

[0057] 3) After the raw water is pretreated in the sedimentation tank (turbidity ≤ 5 NTU), it is fed into the mineralization column at a flow rate of 1.0 L / min·L, the temperature is controlled at 25℃, the total contact time is 120 minutes, and the water is separated into different zones (50 minutes for primary impurity removal, 40 minutes for secondary adsorption, and 30 minutes for tertiary leaching).

[0058] The effluent is filtered through a 0.22μm precision filter, and the pH is stabilized at 7.5 by fine-tuning the flow rate, with a positive hydrated ion concentration of 2.8mg / L, resulting in functional mineral water that meets the GB 8537-2018 standard.

[0059] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method for preparing functional mineral water based on graded activated maifanite, characterized in that, Includes the following steps: 1) Pre-treatment of Maifan stone grading: Select high-purity bluish-gray Maifan stone, crush it and screen it into three particle sizes: 2-3mm (30-40%), 0.5-1mm (30-40%), and 80-100 mesh (20-30%). Then, wash it with water to remove impurities, dry it with forced air and activate it at low temperature. 2) Multi-stage synergistic mineralization device construction: The mineralization column is made of stainless steel and is equipped with alternating perforated flow guide baffles. It is filled from top to bottom with 2-3mm, 0.5-1mm and 80-100 mesh maifanite pre-treated in step 1), which plays the role of primary impurity removal, secondary adsorption and tertiary leaching. 3) Precise mineralization control: After the raw water is pretreated in the sedimentation tank, it is sent to the mineralization column in step 2). The temperature and total contact time are controlled to achieve regional retention. The effluent is filtered through a precision filter of at least 0.22μm and the pH is adjusted to obtain functional mineral water.

2. The preparation method according to claim 1, characterized in that, The high-purity bluish-gray maifanite mentioned in step 1) contains SiO2 ≥ 65wt% and Al2O3 ≤ 15wt%.

3. The preparation method according to claim 1 or 2, characterized in that, The forced-air drying in step 1) is forced-air drying at 105℃ until the moisture content is ≤1wt%; the low-temperature activation is low-temperature activation at 200℃ for at least 2-3 hours.

4. The preparation method according to claim 1, characterized in that, In step 2), the inner diameter of the mineralized column is 500-600 mm and the height is 2000-2500 mm.

5. The preparation method according to claim 4, characterized in that, In step 2), the mineralization column is equipped with at least 4 alternating perforated flow guide baffles. Preferably, the diameter of the perforations is 10-15 mm and the spacing between the perforations is 50-60 mm.

6. The preparation method according to claim 1, characterized in that, In step 3), the raw water is pretreated in a sedimentation tank until the turbidity is ≤5 NTU.

7. The preparation method according to claim 6, characterized in that, In step 3), the flow rate of the raw water entering the mineralization column is 0.8-1.0 L / min·L.

8. The preparation method according to claim 1, 6, or 7, characterized in that, In step 3), the temperature is controlled at 25-30℃, and the total contact time is 90-150 minutes.

9. The preparation method according to claim 8, characterized in that, In step 3), the time for each zone to remain is as follows: 40-50 minutes for primary impurity removal, 30-40 minutes for secondary adsorption, and 20-30 minutes for tertiary dissolution.

10. The preparation method according to claim 9, characterized in that, In step 3), the pH is stabilized at 7.5-8.5 and the concentration of positive hydrated ions is 2.8-3.5 mg / L by fine-tuning the flow rate, thus obtaining functional mineral water that meets the GB 8537-2018 standard.