Configuration of disc-type ceramic membrane

Abstract

The utility model discloses a structure of a disc-type ceramic membrane. A support body of the disc-type ceramic membrane is formed by butting inner surfaces of two support body single bodies with the same structure; an outer circle protruding ring is arranged on the outer edge of the inner surface of each supporting body single body, an inner circle hole of a concentric circle structure is formed in the center of each supporting body single body, spokes are evenly distributed between the outer circle protruding rings and the inner circle holes at intervals, connecting pieces and groove holes are evenly distributed on the outer circle protruding rings, the connecting pieces comprise protruding blocks and grooves, the protruding blocks and the grooves are correspondingly matched in shape and are alternately arranged at intervals in position, and the groove holes are communicated with the groove holes. The slotted holes are positioned in the middle between the adjacent connecting pieces; the inner surfaces of the two supporting body single bodies are in butt joint to form the supporting body, the protruding block of one single body is correspondingly embedded into the groove of the other single body, the groove holes are in butt joint with each other, and after the groove holes are in butt joint, ceramic wedges for connection are arranged in the groove holes. According to the utility model, the connecting piece and the slotted hole on the excircle convex ring are combined with the ceramic wedge, so that the connection of the two support body monomers is enhanced, the formed support body is stable in combination, the spokes support the disc-type ceramic membrane in a mirror image cross manner, the mechanical strength and the qualification rate of products are remarkably improved, and meanwhile, the production cost is reduced. The effective filtering area and the permeation flux of the disc type ceramic membrane are also effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ceramic membrane separation, in particular to a configuration of a disc-type ceramic membrane. Background Art

[0002] A disc-type ceramic membrane is a ceramic membrane with a flying saucer shape, where the separation layer is on the outer surface and the permeation channels are inside the cavity. Different from flat ceramic membranes and tubular ceramic membranes, the separation process of the disc-type ceramic membrane is mainly achieved by the rotation of the membrane sheet, rather than the flow or disturbance of the feed liquid. During the rotation of the membrane sheet, a shear force is generated at the interface between the membrane sheet and the feed liquid. This shear force can effectively remove the contamination layer on the outer surface of the membrane, slow down the membrane surface contamination, extend the membrane operation time, prolong the membrane service life, and reduce the membrane operation cost. It is particularly suitable for high-concentration / high-viscosity separation demand feed liquid systems such as biological fermentation, beer brewing, powder preparation, and landfill leachate.

[0003] There are various preparation methods for disc-type ceramic membranes, such as dry pressing method, plastic forming method, slip casting method, or 3D printing forming method, etc. The internal cavity structure mainly includes a hollow type and a distributed water collection channel type. However, the disc-type ceramic membrane with a hollow cavity has the defects of low strength and easy deformation. Therefore, in the prior art, external support spokes arranged in a central radiation symmetry are used on the outer surface of the disc, but the external support spokes will affect the disturbance of the feed liquid during the rotation of the membrane sheet, thereby affecting the shear force on the membrane surface and membrane contamination, and reducing the separation efficiency of the disc-type ceramic membrane. The distributed water collection channel type is generally a hollow structure or parabolic, linear, zigzag, spotted, honeycomb-like, etc. In the prior art, the following preparation process is adopted, that is, the ceramic membrane support body raw material is first laid on the mold to form a first support layer, then a combustible loose body such as carbon powder or starch is laid on the surface of the first support layer, and finally the ceramic membrane support body raw material is laid on the surface of the first support layer and the loose body and dry pressed into one body. During the calcination process, the loose body is completely carbonized and a water collection channel structure inside the cavity is formed. By burning and sacrificing the loose layer, a water collection channel is formed, thereby realizing the one-piece forming technology of the disc-type ceramic membrane to improve the production efficiency of the disc-type ceramic membrane. However, the fluidity and uniformity of the loose layer during the pressing and forming process will directly affect the deformation and cracking on the surface and inside of the disc-type ceramic membrane, thereby resulting in a decrease in the finished product rate of the disc-type ceramic membrane. In addition, in the prior art, a disc-type ceramic membrane with a parabolic water collection channel inside the cavity is also prepared by slip casting and dry pressing.

[0004] In the existing preparation process of disc-shaped ceramic membranes, the dry pressing method has a relatively high qualified rate and production efficiency. In the internal cavity structure of the existing disc-shaped ceramic membranes, the hollow cavity has a high permeation flux but a relatively low qualified rate; the structure with water collection channels distributed has a relatively high qualified rate. However, the convex parabolic or linear distributed water collection channels are symmetrically fitted and distributed, occupying the effective permeation area of the feed liquid, reducing the membrane permeation efficiency, and the fitting operation between the upper and lower water collection channels of the disc-shaped ceramic membrane is complicated, and the bonding is prone to defects, reducing the strength. Therefore, improving the deficiencies in the configuration of the existing disc-shaped ceramic membranes is of great significance for improving the permeation efficiency of disc-shaped ceramic membranes. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a configuration of a disc-shaped ceramic membrane. The support body of the disc-shaped ceramic membrane is formed by butt-jointing the inner surfaces of two identical support body monomers. The connection between the two support body monomers is strengthened through the connectors and slot holes on the outer circular convex ring and in combination with ceramic wedges. The spokes are mirror-crossed to support the disc-shaped ceramic membrane, thereby significantly improving the mechanical strength and qualified rate of the product while enhancing the stability of the connection of the support body, and effectively increasing the effective filtration area and permeation flux of the disc-shaped ceramic membrane.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A configuration of a disc-shaped ceramic membrane provided by the present invention, wherein the support body of the disc-shaped ceramic membrane is formed by butt-jointing the inner surfaces of two identical support body monomers; on the inner surface of the support body monomer, the outer edge is an outer circular convex ring, and a concentric circular inner circular hole is provided in the center; evenly spaced spokes are arranged between the outer circular convex ring and the inner circular hole, and the spokes are arranged in a radial pattern and have the same height as the outer circular convex ring; connectors and slot holes are evenly distributed on the outer circular convex ring; the connectors are convex blocks and grooves, which are correspondingly adapted in shape and are alternately spaced in position; the slot holes are located in the middle between adjacent connectors.

[0008] The two support body monomers are butt-jointed at the inner surface to form a support body, wherein the convex block of one monomer is correspondingly fitted with the groove of the other monomer, and the slot holes are butt-jointed with each other. After the slot holes are butt-jointed, a ceramic wedge for connection is provided therein.

[0009] Further, in the present invention, the convex block is trapezoidal, and the groove is an inverted trapezoid. The spokes are parabolic, and are alternately spaced in long strips and short strips. Their outer ends are all connected to the outer circular convex ring, and the inner ends of the long strip spokes are located at the edge of the inner circular hole. The interval between the inner ends of adjacent long strip spokes forms the permeate discharge port of the disc-shaped ceramic membrane.

[0010] In the above solution, the outer diameter of the support body monomer of the present utility model is 20 - 40 cm, the diameter of the inner circular hole is 5 - 10 cm, and there are 4 - 12 spokes; the height of the outer circular convex ring and the spokes is 0.2 - 0.4 cm, and the widths of both are the same and are 0.4 - 0.8 cm; the diameter of the slot hole is 0.2 - 0.4 cm and the depth is 0.2 - 0.4 cm; the width of the convex block / groove is the same as the width of the outer circular convex ring, the height / depth ≤ the height of the outer circular convex ring, and the length of the longest side is 0.4 - 0.8 cm.

[0011] The present utility model has the following beneficial effects:

[0012] (1) In the present utility model, the connecting piece on the outer circular convex ring strengthens the connection of two support body monomers, which is beneficial to improving the bonding stability of the support body. At the same time, slot holes are provided on the outer circular convex ring, and ceramic wedges are inserted to connect the two monomers of the support body.

[0013] (2) The present utility model uses cross spokes in the cavity to support the disc - type ceramic membrane, which significantly improves the mechanical strength of the product and the qualified rate of the product compared with the cavity - type disc - type ceramic membrane; compared with the symmetrically - fitted disc - type ceramic membrane, the clamp - shaped support spokes of the present utility model only form a permeation blind spot at the intersection, while the liquid can still be permeated and separated at the other spoke positions, improving the effective filtration area and permeation flux of the disc - type ceramic membrane.

[0014] (3) When the ceramic wedge shrinks, melts and fills the slot hole at the calcination temperature in the present utility model, it is beneficial to improve the working efficiency and product qualified rate of the bonding between the disc - type support body monomers, and also greatly improves the bonding strength of the disc - type ceramic membrane. Description of the Drawings

[0015] The following will further describe the present utility model in detail in combination with embodiments and drawings:

[0016] Figure 1 is one of the structural schematic diagrams of the support body monomer in the embodiment of the present utility model;

[0017] Figure 2 is the second structural schematic diagram of the support body monomer in the embodiment of the present utility model (a: front view; b: rear view);

[0018] Figure 3 is the structural schematic diagram of the disc - type ceramic membrane in the embodiment of the present utility model.

[0019] In the figure: support body monomer 1, outer circular convex ring 2, convex block 2a, groove 2b, slot hole 2c, inner circular hole 3, spoke 4, outer end of spoke 4a, inner end of spoke 4b Detailed Embodiment

[0020] Figures 1 to 3The following is an embodiment of the configuration of a disc - type ceramic membrane of the present utility model and a method for preparing the ceramic membrane. In this embodiment, the configuration of a disc - type ceramic membrane has a support body formed by butt - jointing the inner surfaces of two identical support body monomers 1.

[0021] As Figure 1 and Figure 2 shown, on the inner surface of the support body monomer 1 (with an outer diameter of 35 cm) (the thickness between the bottom surface of the inner surface and the outer surface is 0.3 cm), there is an outer - circular convex ring 2 at the outer edge, and a central inner - circular hole 3 with a diameter of 8 cm and a concentric - circle structure. The outer - circular convex ring 2 is evenly provided with connectors and slot holes 2c. Among them, the connectors are trapezoidal convex blocks 2a and inverted - trapezoidal grooves 2b, which are correspondingly adapted in shape and are arranged alternately at intervals in position. The slot holes 2c are located in the middle between adjacent connectors.

[0022] Twelve parabolic - shaped spokes 4 are evenly arranged between the outer - circular convex ring 2 and the inner - circular hole 3, and are arranged alternately in long - strip and short - strip forms to form a radial shape. The outer ends 4a of the spokes 4 are all connected to the outer - circular convex ring 2, and the inner ends 4b of the long - strip spokes 4 are located at the edge of the inner - circular hole 3. The intervals between the inner ends 4b of adjacent long - strip spokes 4 form the permeate discharge ports of the disc - type ceramic membrane.

[0023] The heights and widths of the outer - circular convex ring 2 and the spokes 4 are both 0.3 cm. The diameter of the slot hole 4c is 0.3 cm and the depth is 0.3 cm. The width of the convex block 2a / groove 2b is the same as the width of the outer - circular convex ring 2, and the height / depth is 0.2 cm, and the length of the longest side is 0.4 cm.

[0024] The support body is formed by butt - jointing the inner surfaces of the above - mentioned two support body monomers 1. Among them, the convex block 2a of one monomer is correspondingly fitted into the groove 2b of the other monomer, and the slot holes 2c are butt - jointed with each other. After the slot holes 2c are butt - jointed, a ceramic wedge for connection is provided inside. The spokes 4 are cross - arranged in a mirror - flipped manner (see Figure 3 ).

[0025] The method for preparing the above - mentioned disc - type ceramic membrane is as follows:

[0026] (1) Preparation of the support body monomer 1

[0027] 90 parts by weight of alumina powder, 10 parts by weight of titanium oxide powder, 2 parts by weight of HPMC, and 100 parts by weight of water are ball - milled and mixed, and then spray - granulated to obtain a near - spherical particle agglomerate A with a particle size of 0.35 mm; then, a die - pressing molding method is adopted, molded under a pressure of 35 MPa, with a pressure - holding time of 40 s. After demolding, it is calcined at a temperature of 1620 °C for a heat - preservation time of 2 h to obtain the support body monomer 1;

[0028] (2) Preparation of the cylindrical ceramic wedge

[0029] Mix 95 parts of cordierite, 5 parts of quartz, 4 parts of CMC, and 80 parts of water by weight, and perform ball milling and mixing. Then obtain nearly spherical particle aggregates B with a particle size of 0.25 mm through spray granulation. Then, adopt the die pressing method to form at a pressure of 10 MPa, with a pressure holding time of 30 s. After demolding, obtain a cylindrical ceramic wedge with a diameter of 0.3 cm and a height of 0.55 cm.

[0030] (3) Preparation of the disk-shaped ceramic membrane component

[0031] Adopt the dip coating method to prepare a separation membrane layer on the outer surface of the above-mentioned support body monomer 1. After drying at a temperature of 100 °C, obtain a disk-shaped ceramic membrane component with a green body layer of the separation membrane layer.

[0032] (4) Preparation of the disk-shaped ceramic membrane

[0033] Take a disk-shaped ceramic membrane component, place one end of the above-mentioned ceramic wedge in the slot 2c, and apply a bonding slurry on the surfaces of the outer circular convex ring 2 and the spoke 4. Take another disk-shaped ceramic membrane component, butt the inner surfaces of the two disk-shaped ceramic membrane components. The convex block 2a of one monomer corresponds to and fits into the groove 2b of the other monomer, and the spokes 4 are in a mirror-inverted cross shape. The interval between the inner ends 4b of two adjacent long-strip spokes 4 constitutes the permeate discharge port of the disk-shaped ceramic membrane. The slot 2c of the other disk-shaped ceramic membrane component is butted against the other end of the ceramic wedge to achieve the fitting and fixation between the two disk-shaped ceramic membrane components, obtaining a green body of the disk-shaped ceramic membrane support. After drying and calcining at a temperature of 1300 °C for 2 h, obtain a disk-shaped ceramic membrane with a separation membrane layer (the thickness of the separation membrane layer is 28 μm and the average pore diameter is 0.1 μm).

[0034] In the embodiment of the present utility model, the average pore diameter of the disk-shaped ceramic membrane support is 3.8 μm, the porosity is 36.5%, the flexural strength is 96 MPa, and the thermal expansion coefficient at 25 - 1000 °C is 7.45×10 -6 / °C; the volume shrinkage of the cylindrical ceramic wedge after calcination is 8.6%, and the thermal expansion coefficient at 25 - 1000 °C is 4.12×10 -6 / °C.

Claims

1. Configuration of a disc ceramic membrane, characterized in that: The support body of the disc-shaped ceramic membrane is formed by butting the inner surfaces of two support body monomers (1) with the same structure; on the inner surface of the support body monomer (1), an outer circular convex ring (2) is provided at the outer edge, and an inner circular hole (3) with a concentric circle structure is provided in the center; evenly spaced spokes (4) are arranged between the outer circular convex ring (2) and the inner circular hole (3), the spokes (4) are arranged in a radial shape, and the height of the spokes (4) is the same as that of the outer circular convex ring (2); connecting pieces and slot holes (2c) are evenly distributed on the outer circular convex ring (2); the connecting pieces are convex blocks (2a) and grooves (2b), which are correspondingly adapted in shape and are arranged alternately at intervals in position; the slot holes (2c) are located in the middle between adjacent connecting pieces. The two support body monomers (1) are butted with their inner surfaces to form a support body, wherein the convex block (2a) of one monomer is correspondingly fitted with the groove (2b) of the other monomer, and the slot holes (2c) are butted with each other. After the slot holes (2c) are butted, a ceramic wedge for connection is arranged therein.

2. The configuration of the disk-type ceramic membrane according to claim 1, characterized in that: The convex block (2a) is trapezoidal, and the groove (2b) is an inverted trapezoid.

3. The configuration of the disk-type ceramic membrane according to claim 1 or 2, characterized in that: The spokes (4) are in a parabolic shape, and are arranged alternately at intervals in the form of long strips and short strips. Their outer ends (4a) are all connected to the outer circular convex ring (2). The inner ends (4b) of the long strip-shaped spokes (4) are located at the edge of the inner circular hole (3). The intervals between the inner ends (4b) of adjacent long strip-shaped spokes (4) form the permeate discharge port of the disc-shaped ceramic membrane.

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