Porous ceramic supporting body for high-strength inorganic separation film

Abstract

The invention relates to a high intensity porous ceramic supporting body used for an inorganic separation membrane. The porous ceramic supporting body is characterized by consisting of the following compositions by weight portion: 100 portions of pulverized corundum, 10 to 15 portions of kaolin and / or clay, 8 to 15 portions of potassium feldspar, 1 to 2 portions of carbonate, 3 to 5 portions of aluminum stearate and / or graphite, 2 to 10 portions of methylcellulose and / or dextrine, and 8 to 12 portions of colloidal alumina with a solid content between 8 and 12 percent. The breaking strength of the porous ceramic supporting body of a filter pipe is greatly increased, and the mechanical intensity of a sample is up to 55 to 65MPa; a ceramic inorganic membrane filter pipe made by taking the ceramic supporting body as a matrix can meet the non ferrous metal electrolytic refining technology completely and the use requirements of the filtration and purification of the electrolyte; moreover, the porous ceramic supporting body has simple preparation process, does not have special requirement, has low cost of raw materials, and does not need expensive raw materials; therefore, the cost is not increased greatly. The colloidal alumina plays a special function in the compositions, thereby improving the drying production yield and having marked reinforcing function which is unexampled.

Description

technical field [0001] The invention relates to a porous ceramic support body for a high-strength inorganic separation membrane. Background technique [0002] As a high-efficiency filtration and separation medium, ceramic inorganic membrane separation tubes are widely used in various fields of industry. The inorganic microporous ceramic membrane filter tube used in the separation process is covered with an inorganic microporous membrane on the porous ceramic tube support to form a gradient microporous ceramic membrane filter tube. The working pressure of the filter tube is mainly borne by the porous ceramic support body . [0003] The non-ferrous metal industry often adopts the electrolysis process to purify metals. In the electrolytic cell, the crude metal containing impurities is used as the anode, and its sulfate and sulfuric acid are used as the electrolyte. The metal with high purity is obtained at the cathode through electrolysis to realize metal purification. Howeve...

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Problems solved by technology

[0004] Chinese patent CN1350996 discloses a high-strength high-temperature-resistant ceramic catalytic purification filter. The support body is composed of: alumina: 50-70%, zircon: 20-35%, aluminum fluoride: 10-15%, and polyethylene Alcohol aqueous solution is mixed to make a support body, which will become a support body of authigenic mullite fiber reinforced zirconia corundum-mullite ceramic matrix composite material after sintering, but the strength index of the support body is not given. According to the application analysis, it is used for waste gas Purification, due to the large pore size and the small pressure difference between the inner and outer sides of the ceramic wall, the strength requirements are not very high; molten steel filtration is for one-time use, and the strength requirements are not high, so this porous support is difficult to meet the above-mentioned high flexural use Require

The strength of the obtained support is only 22-26.4Mpa, the porosity is 36-45, and the average pore diameter is 40-60um, which obviously still cannot meet the above requirements

[0006] The applicant strengthened it by adding nano-materials such as nano-scale alumina, but due to the agglomeration of nano-scale, it is actually difficult to fully and evenly disperse in the material to play a role, so the strengthening effect is also limited, and the highest sample is only It can reach 40Mpa, but still cannot meet the above-mentioned requirements; and nanomaterials are expensive, resulting in a large increase in manufacturing costs, and it is difficult to enter batches for practical use.