Hollow flat plate ceramic membrane support body and preparation method thereof

A ceramic membrane support body and a technology for a support body, which are applied in the field of ceramic membranes, can solve the problems of small filtration flux, decreased support body strength, low drying efficiency, etc., and achieve simple and efficient process methods, reduce deformation and cracking, and reduce raw material costs. Effect

Inactive Publication Date: 2021-11-16
尹晓琴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the existing technology has the following disadvantages: first, the most commonly used technology for preparing flat ceramic membranes is extrusion molding, because the moisture content of the molded body is relatively high (more than 15%), and the drying efficiency of the product is low, especially for large-sized Samples, drying and firing processes are very easy to deform and crack, resulting in low yield
Moreover, samples that are not deformed after firing may also form many tiny cracks, which will reduce the performance of the product
Other preparation techniques include tape casting, gel casting, etc., which are only suitable for small-scale tests of small-sized products
Secondly, the raw materials of the ceramic membrane support are expensive and the firing temperature is high. For the separation process that does not require strong acid or alkali resistance, such as oil-water separation, seawater desalination, and drinking water treatment, ceramic powder, pore-forming agent, and adhesive are used. The price of the ceramic membrane support prepared from the raw materials of the binder is too high, and the energy consumption is large
Finally, the amount of pore-forming agent added in the current compression molding technology is small, mainly relying on the accumulation of particles to form pores, the porosity is low, and the filtration flux is small; if the amount of pore-forming agent added is increased, it is easy to cause black cores, incomplete degumming warping and cracking; if the porosity is increased by reducing the sintering shrinkage by reducing the firing temperature or reducing the pressing pressure to reduce the particle packing density, the strength of the support will be severely reduced

Method used

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  • Hollow flat plate ceramic membrane support body and preparation method thereof
  • Hollow flat plate ceramic membrane support body and preparation method thereof
  • Hollow flat plate ceramic membrane support body and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The preparation method of the hollow flat ceramic membrane support body described in this embodiment comprises the following steps:

[0042] (1) Use 30wt% alumina, 20wt% zirconia, 20wt% kaolin, 20wt% mullite, and 10wt% albite as the support aggregate, and add 5wt% sawdust and 10wt% sawdust to the aggregate. % starch and 30wt% carboxymethyl cellulose solution (concentration 1wt%) are mixed, after drying, crushing, sieving, granulating, after being dried to moisture content 5%-8%, be pressed into size under 50MPa pressure A 1200*600*2mm flat ceramic membrane support body with strip-shaped protrusions on the surface and a flat ceramic membrane support body with a size of 1200*600*2mm, the protrusions are evenly distributed on the flat surface The upper surface of the ceramic membrane support body is consistent with the length direction of the support body, and is arranged side by side at intervals in the length direction and width direction of the support body; the length of...

Embodiment 2

[0048] The preparation method of the hollow flat ceramic membrane support body described in this embodiment comprises the following steps:

[0049] (1) 5wt% aluminum oxide, 95wt% kaolin are support body aggregates, add bamboo powder, 10wt% graphite and 16wt% lignocellulose solution (concentration 5wt%) for aggregate consumption 10wt% in the aggregate, mix, After drying, crushing, sieving, and granulation, after drying to a moisture content of 5%-8%, press it under a pressure of 50MPa to form a flat ceramic membrane support with a size of 1200*600*2mm and strip-shaped protrusions on the surface. Body green body and a flat ceramic membrane support body with a size of 1200*600*2mm, the protrusions are evenly distributed on the upper surface of the flat ceramic membrane support body, consistent with the length direction of the support body , and in the length direction and width direction of the support body, they are arranged side by side at intervals; the length of the protrusio...

Embodiment 3

[0054] The preparation method of the hollow flat ceramic membrane support body described in this embodiment comprises the following steps:

[0055] (1) 80wt% titanium dioxide, 15% bentonite, and 5wt% microsilica are used as the support body aggregate, and carbon black and 16wt% lignocellulose solution (concentration 5wt%) are mixed in the aggregate , after drying, crushing, sieving and granulation, after drying to a moisture content of 5%-8%, press under a pressure of 50MPa to form a flat ceramic membrane with a size of 1200*600*2mm and S-shaped protrusions on the surface The support body and the flat ceramic membrane support body with a size of 1200*600*2mm, the protrusions are evenly distributed on the upper surface of the flat ceramic membrane support body, consistent with the length direction of the support body, And in the length direction and width direction of the support body, they are arranged side by side at intervals; the length of the protrusions is 30-200mm, the w...

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Abstract

The invention discloses a hollow flat plate ceramic membrane support body and a preparation method thereof. The preparation method comprises the following steps that: (1) aggregate, a pore forming agent, a binder and water are well mixed, granulated, dried, and subjected to dry pressing molding to obtain a flat plate ceramic membrane support body blank with bulges on the surface and a flat plate ceramic membrane support body blank with a flat surface, wherein the bulges are uniformly distributed on the upper surface of the flat plate ceramic membrane support body blank, are consistent with or vertical to the length direction of the support body, and are arranged in parallel at intervals in the length direction and the width direction of the support body; (2) after the bulges are coated with slurry, the flat plate ceramic membrane support body blank with bulges and the flat plate ceramic membrane support body blank with a flat surface are spliced together; and (3) drying, glue discharging and sintering are carried out on the spliced support body blank to obtain a hollow flat plate ceramic membrane support body. The preparation method is simple, efficient, low in cost and high in yield. The hollow flat plate ceramic membrane support body has the characteristics of high porosity, high breaking strength and large filtration flux.

Description

technical field [0001] The invention belongs to the technical field of ceramic membranes, and relates to a hollow flat ceramic membrane support body and a preparation method. Background technique [0002] Ceramic membrane supports are generally composed of high-strength, high-temperature-resistant, corrosion-resistant, and thermally stable large-grained ceramic aggregates and relatively easy-to-sinter binders. Large-grained ceramic aggregates mainly provide high strength for the support. Support molding techniques include extrusion molding, tape casting, gel injection molding, and the like. But the existing technology has the following disadvantages: first, the most commonly used technology for preparing flat ceramic membranes is extrusion molding, because the moisture content of the molded body is relatively high (more than 15%), and the drying efficiency of the product is low, especially for large-sized Samples are easily deformed and cracked during drying and firing, res...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/46C04B35/185C04B35/622C04B33/13C04B38/06C04B38/02B01D63/08B01D71/02B01D69/06B01D67/00
CPCC04B35/10C04B35/46C04B35/185C04B35/622C04B33/13C04B38/0645C04B38/067C04B38/0675C04B38/068B01D63/081C04B38/02B01D71/02B01D69/06B01D71/025B01D71/024B01D67/0039C04B2235/3244C04B2235/349C04B2235/3463C04B2235/3472C04B2235/3217C04B2235/3418C04B2235/321C04B2235/3208C04B2235/3481C04B2235/3826C04B2235/96C04B38/0074Y02A20/131
Inventor 尹晓琴
Owner 尹晓琴
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