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Preparation method of low-temperature sintered acid-and-alkali-resistant porous silicon carbide ceramic supporting body

A technology of porous silicon carbide and low-temperature sintering, which is applied in the field of inorganic membrane separation materials and inorganic porous materials. It can solve the problems of unusable silicon carbide filter tubes, recovery of the flux of washing filter tubes, and high equipment prices, and achieve good hydrophilicity and performance. Effects of anti-pollution, low cost, low production cost and low investment cost

Active Publication Date: 2018-01-23
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because silicon oxide is resistant to acid and alkali, the silicon carbide filter tube produced by this method cannot be used under strong alkaline conditions, and when the filter tube is blocked, it cannot be washed with alkaline solution to restore the flux of the filter tube
[0005] Therefore, in view of the problems of high temperature, high equipment price, high energy consumption, high cost and the shortcomings of poor thermal shock resistance and alkali resistance in the prior art

Method used

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  • Preparation method of low-temperature sintered acid-and-alkali-resistant porous silicon carbide ceramic supporting body
  • Preparation method of low-temperature sintered acid-and-alkali-resistant porous silicon carbide ceramic supporting body
  • Preparation method of low-temperature sintered acid-and-alkali-resistant porous silicon carbide ceramic supporting body

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Embodiment 1

[0033]A method for preparing a low-temperature sintered acid and alkali-resistant porous silicon carbide ceramic support body, which sequentially comprises four steps: (1) mud preparation; (2) extrusion molding; (3) low-temperature drying; (4) high-temperature sintering. Wherein, the raw materials used in step (1) are silicon carbide powder, sintering aid, forming machine, pore forming agent, lubricant and solvent. Because the raw material belongs to oily formula and has good plasticity, the porosity of the prepared porous silicon carbide ceramic support body is controllable, and the maximum porosity can reach 55%. Therefore, the porous silicon carbide ceramic support is composed of three-dimensional gaps formed between silicon carbide particles, which ensures the diffusion and flow of the filter medium in a wider space, reduces the filtration resistance, and can significantly improve the recoil cleaning effect, thereby increasing the filtration flux and stability. sex.

Embodiment 2

[0035] Blend 45 μm silicon carbide particles, sintering aids, carboxymethyl cellulose, graphite powder, and tung oil with water and ethanol (V / V=3:2) in a mass percentage ratio of 85:5:3.0:5.5:1.5 In the solvent, the mixed solvent accounts for 24wt% of the total amount. Dry mix in a strong mixer for 30 minutes, add solvent and wet mix for 120 minutes, and then vacuum mud once at -0.95MPa, pack the refined mud in a vacuum bag, and store it at room temperature 24 hours, before opening the tube, practice the mud again in vacuum. The extruded mud is a tubular porous silicon carbide ceramic support mud with an outer diameter of 32mm, a channel diameter of 4.2mm, 19 holes, and a length of 1016mm. The extrusion pressure is 10Mpa and the extrusion speed is 20mm / s. The mud is dried indoors for 24 hours, then transferred to an oven, heated from room temperature to 50°C with a heating rate of 1°C / min, and kept for 6 hours; from 50°C to 80°C, with a heating rate of 1°C / min, kept for 6 hou...

Embodiment 3

[0037] Blend 62 μm silicon carbide particles, sintering aids, carboxymethyl cellulose, graphite powder, and tung oil with water and ethanol (V / V=3:2) in a mass percentage ratio of 82:8:3.5:5.0:1.5 In the solvent, the mixed solvent accounts for 21wt% of the total amount. Dry-mix in a strong mixer for 30 minutes, add solvent and wet-mix for 120 minutes, and then vacuum mud once at -0.95MPa, pack the refined mud in a vacuum bag, and store it at room temperature 24 hours, before opening the tube, practice the mud again in vacuum. The extruded mud is a tubular porous silicon carbide ceramic support body with an outer diameter of 32mm, a channel diameter of 4.2mm, 19 holes, and a length of 1016mm. The extrusion pressure is 8.5Mpa and the extrusion speed is 30mm / s. The mud is dried indoors for 24 hours, then transferred to an oven, heated from room temperature to 50°C at a heating rate of 2°C / min, and kept for 5 hours; from 50°C to 80°C, with a heating rate of 2°C / min, kept for 5 hou...

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Abstract

The invention relates to the technical field of porous ceramic material and film separation, in particular to a low-temperature sintered acid-and-alkali-resistant porous silicon carbide ceramic supporting body and a method for preparing the same. The method comprises the following steps: slurry preparation, extrusion forming, low-temperature drying and high-temperature sintering. Raw materials used in slurry preparation comprise silicon carbide powder, a sintering aid, a forming agent, a pore-forming agent, a lubricating agent and a solvent. The low-temperature sintered acid-and-alkali-resistant porous silicon carbide ceramic supporting body is mainly characterized in that the porous silicon carbide ceramic supporting body which is high in mechanical strength and high in porosity and resists acid and alkali can be fired with the sintering aid capable of resisting acid and alkali at the temperature of 1,400 DEG C. The low-temperature sintered acid-and-alkali-resistant porous silicon carbide ceramic supporting body has the advantages of low sintering temperature, low production energy consumption, simple technological method, low equipment requirements, low production cost and investment cost, flexible control, easiness in forming, suitability for industrial customization, and capability of meeting large-scale production.

Description

technical field [0001] The patent of the present invention relates to the technical field of inorganic porous materials, in particular to the technical field of inorganic membrane separation materials, specifically a low-temperature sintered acid and alkali-resistant porous silicon carbide ceramic support and a preparation method thereof. Background technique [0002] Porous silicon carbide ceramics are widely used in environmental protection fields such as sewage treatment and high-temperature gas dust removal as filter materials. High, strong anti-pollution ability, simple operation, easy cleaning and many other advantages will become the key component materials and development trends of membrane separation technology in the field of environmental protection. [0003] Patent CN102389719A discloses a method for preparing a silicon carbide ceramic membrane support. This method utilizes the principle of evaporative condensation, and particles of different particle sizes must...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/622C04B38/06B01D67/00B01D69/10B01D71/02
Inventor 陈锋涛俞三传
Owner ZHEJIANG SCI-TECH UNIV
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