High-performance chlorine-removing mineralized ceramic microspheres and preparation method thereof

Abstract

The application discloses high-performance dechlorination mineralization ceramic microspheres and a preparation method thereof. The ceramic microspheres comprise the following components in mass fraction: 90-93% of calcium sulfite, 3-4% of calcium oxide, 3-4% of zinc oxide and 1-2% of silicon dioxide. The particle size of the ceramic microspheres is 1-2 mm. Compared with the existing ceramic material sintering technology, the dechlorination mineralization ceramic microspheres are composed of calcium sulfite, calcium oxide, zinc oxide and silicon dioxide, deionized water and external mechanical pressure are used to help the ceramic powder densification, and rapid forming is realized at a lower ceramic sintering temperature, so that time can be saved and production capacity can be improved in actual production. Meanwhile, the dechlorination mineralization ceramic microspheres prepared by using the preparation process can be filled in a filter container and directly applied, the content of calcium sulfite is as high as 90% or more, the dechlorination performance of the unit gram weight calcium sulfite ceramic microspheres is much better than that of common calcium sulfite powder and particles, and the dechlorination mineralization ceramic microspheres also have a mineralization effect.

Description

Technical Field

[0001] This invention relates to the field of dechlorination filter media technology, and in particular to a high-performance dechlorination mineralization ceramic microsphere and its preparation method. Background Technology

[0002] Residual chlorine is one of the indicators for conventional disinfectants (GB 5749-2022 "Standards for Drinking Water Quality"). It utilizes free residual chlorine (ClO₂). - The oxidizing properties of chlorides (HClO, Cl2) can kill microorganisms in tap water and pipe networks, preventing the spread of certain waterborne infectious diseases. However, recent studies have shown that chlorides in drinking water are inextricably linked to the risk of cancer (International Agency for Research on Cancer, 1982, 1987, 1999).

[0003] Calcium sulfite (CaSO3), with its reducing properties, can undergo a redox reaction with free residual chlorine and is widely used as a dechlorination filter media. Calcium, as an indispensable second messenger for cells, participates in the regulation of almost all physiological processes by activating specific target proteins. Adequate calcium intake is crucial, and calcium-mineralized water can be one approach (GB 1886.6-2016 "Food Additives Calcium Sulfate"). Existing calcium sulfite products may have the following drawbacks: Ordinary calcium sulfite is a white powder, generally around 500 mesh. If this powder is directly filled into the filter container, it is easily washed away before being fully utilized during the raw water flow. Therefore, the direct application of ordinary calcium sulfite powder is very difficult, resulting in low dechlorination efficiency.

[0004] Granulation of calcium sulfite has addressed the aforementioned issues to some extent. Currently, commercially available calcium sulfite granules for drinking water generally contain less than 85% calcium sulfite, and are primarily in the form of calcium sulfite powder bound together with adhesives. Because these granules have a low calcium sulfite content, and the higher the adhesive content, the greater the probability of uneven distribution within the granules. As the flow rate of raw water increases, the unevenly distributed adhesive gradually restricts the raw water's contact with the interior of the calcium sulfite granules, resulting in a still relatively low dechlorination performance per unit weight of calcium sulfite granules. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a high-performance dechlorination mineralization ceramic microsphere and its preparation method.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] The first aspect of the present invention is to provide a high-performance dechlorination mineralization ceramic microsphere, wherein the ceramic microsphere comprises the following components in mass fractions: 90% to 93% calcium sulfite, 3% to 4% calcium oxide, 3% to 4% zinc oxide, and 1% to 2% silicon dioxide;

[0008] The ceramic microspheres have a particle size of 1 mm to 2 mm.

[0009] A second aspect of this invention is to provide a method for preparing the above-mentioned high-performance dechlorination mineralization ceramic microspheres, comprising the following steps:

[0010] Step 1: Mix calcium sulfite powder, calcium oxide powder, zinc oxide powder and silicon dioxide powder according to the mass fraction ratio, stir evenly to obtain a uniform mixture;

[0011] Step 2: Place the uniform preform into the spherical blank, and then add deionized water at a mass fraction of 2% of the mass of the uniform preform;

[0012] Step 3: Apply a mechanical pressure of 350 MPa to 400 MPa and perform low-temperature rapid firing at 300 to 350°C for 5 to 10 minutes to obtain the high-performance dechlorination mineralization ceramic microspheres.

[0013] In step three, the sintering principle is: heating the ceramic raw material powder to make the particles bond together, thereby giving the powder strength, densification, and recrystallization (the sintering temperature of common ceramic materials is generally greater than 900℃).

[0014] Furthermore, the calcium sulfite powder has a mesh size of 500 mesh, the calcium oxide powder has a mesh size of 200-300 mesh, the zinc oxide powder has a mesh size of 200-300 mesh, and the silica powder has a mesh size of 100-200 mesh.

[0015] Furthermore, in step three, the temperature of the low-temperature rapid firing is 350°C.

[0016] Furthermore, in step three, the low-temperature rapid burning time is 5 minutes.

[0017] The present invention adopts the above technical solution and has the following technical effects compared with the prior art:

[0018] Compared with existing ceramic material sintering technologies, the dechlorination mineralization ceramic microspheres of this invention are composed of calcium sulfite, calcium oxide (CaO), zinc oxide (ZnO), and silicon dioxide (SiO2). An intermediate liquid (deionized water) and external mechanical pressure are used to help densify the ceramic powder, achieving rapid (5 min) molding at a relatively low ceramic sintering temperature (350℃), saving time and increasing production capacity in actual production. Furthermore, the dechlorination mineralization ceramic microspheres prepared using the process described in this application can be directly filled into filter containers for application, and the calcium sulfite content is as high as 90% or more. The dechlorination performance per unit weight of calcium sulfite ceramic microspheres is significantly better than that of ordinary calcium sulfite powder and granules, while also exhibiting a mineralization effect (increased calcium concentration in the effluent after dechlorination). Attached Figure Description

[0019] Figure 1 This is an appearance image of the high-performance dechlorination mineralization ceramic microspheres prepared in Example 1 of the present invention;

[0020] Figure 2 The chart shows the residual chlorine removal performance of the microspheres in Example 1, Comparative Example 1, and Comparative Example 2. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the invention. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other.

[0022] Example 1

[0023] This embodiment discloses a method for preparing high-performance dechlorination mineralization ceramic microspheres, including the following steps:

[0024] Step 1: According to the mass fraction ratio, mix 92% calcium sulfite powder (500 mesh), 3% calcium oxide powder (200-300 mesh), 3% zinc oxide powder (200-300 mesh), and 2% silica powder (100-200 mesh), stir evenly, and obtain a uniform mixture;

[0025] Step 2: Place the above uniform preform into the pellet, and then add deionized water at a mass fraction of 2% of the mass of the uniform preform;

[0026] Step 3: Apply a mechanical pressure of 350 MPa to 400 MPa and perform low-temperature rapid calcination at 350°C for 5 minutes to obtain high-performance dechlorination mineralization ceramic microspheres. The appearance of the prepared high-performance dechlorination mineralization ceramic microspheres is as follows. Figure 1 As shown.

[0027] At 350℃ (lower than the general ceramic sintering temperature), a mechanical pressure of 350 MPa to 400 MPa is applied simultaneously. At this time, the mechanical pressure and temperature in the system cause the intermediate liquid (deionized water) to evaporate instantaneously, thereby accelerating the supersaturation of the system contents. Solid particles diffuse in the liquid phase and precipitate solid solutions on the surface far from the pressure area, filling the grain boundaries or pores of the system. This minimizes the surface free energy of the solid particles, thereby achieving rapid (5 min) densification sintering of the dechlorinated mineralized ceramic microspheres.

[0028] Example 2

[0029] This embodiment discloses a method for preparing high-performance dechlorination mineralization ceramic microspheres, including the following steps:

[0030] Step 1: According to the mass fraction ratio, mix 90% calcium sulfite powder (500 mesh), 4% calcium oxide powder (200-300 mesh), 4% zinc oxide powder (200-300 mesh), and 2% silica powder (100-200 mesh), stir evenly, and obtain a uniform mixture.

[0031] Step 2: Place the above uniform preform into the pellet, and then add deionized water at a mass fraction of 2% of the mass of the uniform preform;

[0032] Step 3: Apply mechanical pressure of 350 MPa to 400 MPa and perform low-temperature rapid firing at 350°C for 5 minutes to obtain high-performance dechlorination mineralized ceramic microspheres.

[0033] Example 3

[0034] This embodiment discloses a method for preparing high-performance dechlorination mineralization ceramic microspheres, including the following steps:

[0035] Step 1: According to the mass fraction ratio, mix 93% calcium sulfite powder (500 mesh), 3% calcium oxide powder (200-300 mesh), 3% zinc oxide powder (200-300 mesh), and 1% silica powder (100-200 mesh), stir evenly, and obtain a uniform mixture.

[0036] Step 2: Place the above uniform preform into the pellet, and then add deionized water at a mass fraction of 2% of the mass of the uniform preform;

[0037] Step 3: Apply mechanical pressure of 350 MPa to 400 MPa and perform low-temperature rapid firing at 350°C for 5 minutes to obtain high-performance dechlorination mineralized ceramic microspheres.

[0038] Comparative Example 1

[0039] Commercially available chemically pure calcium sulfite powder.

[0040] Comparative Example 2

[0041] Commercially available calcium sulfite granules consist of 85% calcium sulfite powder and 15% binder by mass.

[0042] The high-performance dechlorination mineralization ceramic microspheres prepared in Example 1 were compared with those of Comparative Examples 1 and 2 in terms of residual chlorine removal performance, under the conditions shown in Table 1 below. The results are as follows: Figure 2 As shown.

[0043] Table 1

[0044]

[0045] The mineralization properties of the high-performance dechlorination mineralization ceramic microspheres prepared in Example 1 were tested, and the results are shown in Table 2 below:

[0046] Table 2

[0047]

[0048] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the content and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing high performance dechlorinated mineralized ceramic microspheres, characterized in that, The method comprises the following steps: Step one, 90%-93% of calcium sulfite powder, 3%-4% of calcium oxide powder, 3%-4% of zinc oxide powder and 1%-2% of silicon dioxide powder are mixed according to mass fraction, and are stirred uniformly to obtain a uniform mixture; Step two, the uniform mixture is put into a ball blank, and 2% of deionized water of the mass of the uniform mixture is added; Step three, a mechanical pressure of 350-400 MPa is applied, low-temperature rapid firing is carried out at 300-350 DEG C for 5-10 min to obtain the high-performance dechlorination mineralized ceramic microspheres; the particle size of the ceramic microspheres is 1-2 mm.

2. The method for preparing high-performance dechlorinated mineralized ceramic microspheres according to claim 1, characterized in that, The mesh number of the calcium sulfite powder is 500, the mesh number of the calcium oxide powder is 200-300, the mesh number of the zinc oxide powder is 200-300, and the mesh number of the silicon dioxide powder is 100-200.

3. The method of claim 1, wherein the high performance dechlorinated mineralized ceramic microspheres are prepared by the process of: In step three, the temperature of the low-temperature rapid firing is 350 DEG C.

4. The method of claim 1, wherein the high performance dechlorinated mineralized ceramic microspheres are prepared by the process of: In step three, the time of the low-temperature rapid firing is 5 min.

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