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KR-20260064261-A - Ceramic membrane comprising illite particles and method for preparing the same

KR20260064261AKR 20260064261 AKR20260064261 AKR 20260064261AKR-20260064261-A

Abstract

The present invention relates to a ceramic separation membrane containing illite particles and a method for manufacturing the same, and more specifically, to a ceramic separation membrane with improved mechanical strength containing illite particles as an additive and a method for manufacturing the same. According to the present invention, illite particles are added to improve the bonding strength between ceramic particles, thereby providing a ceramic separation membrane with significantly improved mechanical strength even under a low-temperature sintering process.

Inventors

  • 김성중
  • 정진우
  • 김승연
  • 김아진
  • 이혜선

Assignees

  • 한국세라믹기술원

Dates

Publication Date
20260507
Application Date
20241031

Claims (18)

  1. ceramic support; and A ceramic separation membrane comprising illite particles distributed on the ceramic support.
  2. In paragraph 1, The ceramic support above includes ceramic particles, A ceramic separation membrane characterized in that the ceramic particles are one or more selected from the group consisting of alumina ( Al₂O₃ ), titania ( TiO₂ ), barium titanate ( BaTiO₃ ), silica ( SiO₂ ), zirconia ( ZrO₂ ), magnesium oxide (MgO), and zinc oxide (ZnO).
  3. In paragraph 1, A ceramic separation membrane characterized by having a content of 3 to 15 weight percent of the illite particles.
  4. In paragraph 1, The above illite particles comprise 50 to 70 wt% SiO₂ , 20 to 30 wt% Al₂O₃ , and K₂O 5 to 6 weight%, Fe₂O₃ 1 to 3 wt%, TiO2 0.3 to 0.5 weight%, MgO 0.2 to 0.3 weight%, A ceramic separator characterized by containing 0.1 to 0.5 weight% of Na₂O .
  5. A ceramic separation membrane according to claim 2, characterized in that the diameter of the ceramic particles is 1 to 35 μm.
  6. In paragraph 1, A ceramic separator characterized by the thickness of the ceramic separator being 1 to 5 mm.
  7. (a) A step of obtaining illite particles by milling illite; (b) a step of mixing the illite particles and ceramic particles to obtain a mixture; (c) a step of compressing the above mixture; and (d) A method for manufacturing a ceramic separation membrane comprising the step of heat-treating the above-mentioned compressed mixture.
  8. In Paragraph 7, A method for manufacturing a ceramic separation membrane, characterized in that the ceramic particles are one or more selected from the group consisting of alumina ( Al₂O₃ ), titania ( TiO₂ ), barium titanate ( BaTiO₃ ), silica ( SiO₂ ), zirconia ( ZrO₂ ), magnesium oxide (MgO), and zinc oxide (ZnO).
  9. In Paragraph 7, The above illite particles comprise 50 to 70 wt% SiO₂ , 20 to 30 wt% Al₂O₃ , and K₂O 5 to 6 weight%, Fe₂O₃ 1 to 3 wt%, TiO2 0.3 to 0.5 weight%, MgO 0.2 to 0.3 weight%, A method for manufacturing a ceramic separation membrane characterized by containing 0.1 to 0.5 weight% of Na₂O .
  10. In Paragraph 7, A method for manufacturing a ceramic separation membrane, characterized in that the milling of step (a) above is performed using one or more methods selected from the group consisting of a bead mill, a ball mill, a high energy ball mill, a planetary mill, a stirred ball mill, and a vibration mill.
  11. In Paragraph 7, A method for manufacturing a ceramic separator membrane, characterized in that step (a) above is performed by ball milling at 50 to 400 rpm for 12 to 36 hours.
  12. In Paragraph 7, A method for manufacturing a ceramic separation membrane characterized in that, in step (b) above, the content of the illite particles is 3 to 15 weight%.
  13. In Paragraph 7, A method for manufacturing a ceramic separation membrane, characterized in that the above step (c) is performed under a pressure of 50 to 500 bar.
  14. In Paragraph 7, The above step (d) is a method for manufacturing a ceramic separation membrane comprising a step of performing a first heat treatment of the compressed mixture under predetermined conditions and a step of performing a second heat treatment under predetermined conditions after the first heat treatment.
  15. In Paragraph 14, A method for manufacturing a ceramic separation membrane, characterized in that the first heat treatment step is performed at a temperature of 400 to 800℃.
  16. In paragraph 15, A method for manufacturing a ceramic separation membrane, characterized in that the first heat treatment step is performed for 0.2 to 3 hours after heating at a heating rate of 0.3 to 5℃/min.
  17. In Paragraph 14, A method for manufacturing a ceramic separation membrane, characterized in that the second heat treatment step is performed at a temperature of 1100 to 1800℃.
  18. In Paragraph 17, A method for manufacturing a ceramic separation membrane, characterized in that the second heat treatment step is performed for 0.2 to 3 hours after heating at a heating rate of 1 to 10℃/min.

Description

Ceramic membrane comprising illite particles and method for preparing the same The present invention relates to a ceramic separation membrane containing illite particles and a method for manufacturing the same, and more specifically, to a ceramic separation membrane with improved mechanical strength containing illite particles as an additive and a method for manufacturing the same. Membrane technology is widely applied in the water treatment field due to its ease of application and the ability to obtain excellent water quality immediately after purifying contaminated water. Furthermore, it can be applied to secondary battery separators, the production and refining of petrochemicals, shale oil or gas extraction, seawater desalination, and low-emission or capture technologies for gaseous components such as carbon dioxide, hydrogen, and oxygen. In terms of materials, various membranes composed of metals, polymers, ceramics, and composites are used. Polymer membranes have disadvantages such as low mechanical strength, poor chemical stability, and low temperature resistance. In contrast, ceramic membranes possess excellent pressure resistance due to the rigid pore structure inherent to ceramic materials. Furthermore, they exhibit superior heat resistance, chemical resistance, and biological resistance, offering the advantage of being suitable for use in harsh conditions where polymer membranes cannot be applied, such as the separation and purification of high-temperature solutions containing strong acids, strong alkalis, organic solvents, and oils. Additionally, ceramic membranes maintain their physical properties even under high-pressure washing, high-temperature sterilization, and cleaning with high-concentration chemicals, allowing for semi-permanent use. Although the demand for ceramic separators is increasing due to the aforementioned advantages, there are problems such as difficulty in molding due to the inherent brittleness of ceramics and increased manufacturing costs resulting from the requirement of high-temperature sintering processes. To address these issues, research is actively underway to improve sintering characteristics by adding various sintering aids. Figure 1 shows a flowchart of a method for manufacturing a ceramic separation membrane according to the present invention. Figure 2 shows cross-sectional SEM images of ceramic membranes according to the added illite content (a: Comparative Example 1, b: Example 1, c: Example 2, d: Example 3). Figure 3 shows cross-sectional SEM images of ceramic membranes according to the added illite content (a: Comparative Example 3, b: Comparative Example 4, c: Example 7, d: Example 8, e: Example 9, f: Example 10, g: Comparative Example 5, h: Comparative Example 6). Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by a skilled expert in the art to which this invention pertains. In general, the nomenclature used herein is well known and commonly used in the art. The present invention relates to a ceramic separation membrane. In this invention, illite particles are distributed on a ceramic support to improve the sintering characteristics of the ceramic separation membrane by strengthening the bonding force between ceramic particles, thereby providing a ceramic separation membrane with improved mechanical strength. To this end, the present invention provides a ceramic separation membrane comprising a ceramic support; and illite particles distributed on the ceramic support. At this time, the ceramic support comprises ceramic particles, and the ceramic particles are preferably one or more selected from the group consisting of alumina ( Al₂O₃ ), titania ( TiO₂ ), barium titanate ( BaTiO₃ ), silica ( SiO₂ ), zirconia ( ZrO₂ ), magnesium oxide (MgO) and zinc oxide ( ZnO ), and are more preferably alumina ( Al₂O₃ ). In addition, as can be seen from the results of the following examples, the content of the illite particles is preferably 3 to 15 weight%, and more preferably 10 to 15 weight%. When illite particles are distributed in the ceramic support within the above content range, the mechanical strength of the ceramic membrane can be improved by strengthening the bonding force between the ceramic particles. On the other hand, if the content of illite particles is below the above content range, it is difficult to expect an improvement in mechanical properties and even improvement in durability, and if it exceeds the above upper limit, there is a problem that the pore uniformity of the ceramic membrane is reduced, causing it to lose its function as a membrane. In addition, the illite particles contain various components, and as can be seen from the results of the following examples, the illite particles contain 50 to 70 wt% SiO₂ , 20 to 30 wt% Al₂O₃ , and K₂O 5 to 6 weight%, Fe₂O₃ 1 to 3 wt%, TiO2 0.3 to 0.5 weight%, MgO 0.2 to 0.3 weight%, It is preferable to include 0.1 to 0.5 weight% of Na₂O , and if