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Preparation method for silicon carbide candled filter

A filter and silicon carbide technology, applied in chemical instruments and methods, filtration separation, separation methods, etc., to achieve the effects of high filtration efficiency and precision, rich macropore structure, and wide working temperature range

Inactive Publication Date: 2011-04-13
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002]Silicon carbide candle filters are usually produced by traditional production methods such as grouting, extrusion and isostatic pressing. The current production of silicon carbide candle filters is due to Due to the limitation of process technology, the silicon carbide candle filter produced has low strength, uneven pore size distribution, low filtration efficiency and high production cost, especially in the aspect of high temperature gas purification, which is prone to large pressure drop during use and backflushing cleaning Difficult, short lifespan

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Preparation of ceramic bond:

[0021] Alumina, Suzhou clay, and calcium bicarbonate are uniformly mixed in weight percentages of 10%, 88%, and 2%, and the obtained mixed powder is dry ground in a ball mill to a powder with a particle size of less than 2 μm.

[0022] 2. Preparation of wax slurry

[0023] Paraffin wax, beeswax, and oleic acid are mixed uniformly at a temperature of 80° C. in a weight percentage of 85%, 10%, and 5% to prepare a wax slurry.

[0024] 3. Preparation of porous ceramic wax slurry

[0025] Mix 200μm silicon carbide powder, ceramic bond, and carbon powder at 80%, 15%, and 5% by weight, and then add 30% by weight wax slurry and mix uniformly at 60℃ to make porous ceramics. Wax slurry.

[0026] 4. Preparation of transition membrane material slurry

[0027] 90% by weight of 10μm silicon carbide powder, 5% of ceramic bond, 4.7% of carbon powder, 0.3% of polyvinyl alcohol, plus 50% of the total weight of water and uniformly mixed with it to make a transition ...

Embodiment 2

[0037] 1. Preparation of ceramic bond:

[0038] Alumina, Suzhou soil, and calcium bicarbonate are uniformly mixed in weight percentages of 80%, 19%, and 1%, and the obtained mixed powder is dry ground in a ball mill to a powder with a particle size of less than 2 μm.

[0039] 2. Preparation of wax slurry

[0040] Paraffin wax, beeswax and oleic acid are mixed uniformly at a temperature of 70° C. at 92%, 5%, and 3% by weight to prepare wax slurry.

[0041] 3. Preparation of porous ceramic wax slurry

[0042] Mix 60μm silicon carbide powder, ceramic bond and graphite uniformly at 70%, 20%, 10% by weight, then add 40% by weight wax slurry and mix uniformly at 75℃ to make porous ceramic wax Pulp.

[0043] 4. Preparation of transition membrane materials

[0044] Mix 75% by weight of 20μm silicon carbide powder, 15% of ceramic bond, 9% of graphite, 1% of polyvinyl alcohol, plus 70% of the total weight of water with it to form transition membrane material slurry .

[0045] 5. Preparation of mem...

Embodiment 3

[0054] 1. Preparation of ceramic bond:

[0055] Alumina, Suzhou clay, and calcium bicarbonate are uniformly mixed in weight percentages of 50%, 46%, and 4%, and the obtained mixed powder is dry-ground in a ball mill to a powder with a particle size of less than 2 μm.

[0056] 2. Preparation of wax slurry

[0057] Paraffin wax, beeswax, and oleic acid are mixed uniformly at a temperature of 90° C. at 85%, 14%, and 1% by weight to prepare a wax slurry.

[0058] 3. Preparation of porous ceramic wax slurry

[0059] Mix 280μm silicon carbide powder, ceramic binder, and starch at 85%, 5%, 10% by weight, then add 25% by weight wax slurry, mix uniformly at 90℃ to make porous ceramic wax Pulp.

[0060] 4. Preparation of transition membrane materials

[0061] Mix 71% by weight of 30μm silicon carbide powder, 25% of ceramic binder, 2% of starch, 2% of polyvinyl alcohol, plus 30% of the total weight of water with it to form transition film material slurry .

[0062] 5. Preparation of membrane materi...

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Abstract

The invention provides a preparation method for a silicon carbide candled filter, comprising the steps of preparation of materials, forming, drying and sintering. The invention is characterized in that silicon carbide powder with the grain size of 50 to 299 Mum, ceramic bond, plus pore agent and candle slurry are mixed at a certain temperature according to a certain proportion so as to prepare porous ceramic candle slurry; the porous ceramic candle slurry is kept at a certain temperature; a vibration casting method is adopted to form silicon carbide candled filter body with a certain size; the body is sintered into a silicon carbide candled filter element under a certain temperature; transitional membrane material slurry and membrane material slurry are respectively and evenly coated on the surface of the silicon carbide candled filter element in sequential and respectively reaches a certain thickness, and after being dried, the obtained object is sintered into the silicon carbide candled filter under a certain temperature. The silicon carbide candled filter has gradient pore structure, uniform aperture, high porosity, high filtering precision and filtering efficiency, high temperature resistance, easy regeneration and repeatable use.

Description

technical field [0001] The invention relates to a preparation method of a silicon carbide candle filter, which belongs to the technical field of porous ceramic preparation. Background technique [0002] Silicon carbide candle filters are usually produced by traditional production methods such as grouting, extrusion and isostatic pressing. Due to the limitation of process technology, the silicon carbide candle filters produced at present have low strength. , Uneven pore size distribution, low filtration efficiency and high production cost, especially in high-temperature gas purification, it is prone to large pressure drop during use, difficult backflushing cleaning, and short service life. Contents of the invention [0003] The object of the present invention is to provide a method for preparing a silicon carbide candle filter that can overcome the above-mentioned defects, adapt to a wide range of working temperature and have excellent performance. Its technical solutio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D39/20
Inventor 唐竹兴田贵山
Owner SHANDONG UNIV OF TECH
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