High Accuracy Vacuum Porous SiC Ceramic Filter Tube With Round Bottom

Silicon Carbide Filter Tubes:

A silicon carbide filter tube is a high-performance porous ceramic filtering material, widely used across various industries due to its exceptional properties.

A Silicon Carbide Filter Tube is a tubular filtering element with a multitude of interconnected micropores. It is primarily made from high-purity silicon carbide (SiC) through specialized forming processes (such as extrusion molding or isostatic pressing) and high-temperature sintering technology.

Its core principle is Surface Filtration: When fluid containing solid particles passes through the tube wall, the particles are trapped on the surface or within the shallow layer, forming a filter cake. The clean fluid passes through the micropores. As the filter cake thickens, it can be removed by back-pulsing or back-washing, allowing the tube to be regenerated and reused.

Detailed description:

1.Key Characteristics and Advantages

The high regard for silicon carbide filter tubes stems from their outstanding material properties:

1）.  Excellent Chemical Stability:

     Resistant to acid and alkali corrosion, it can operate stably in harsh chemical environments with a pH of 0-14, making it suitable for filtering strong acids, strong alkalis, salt solutions, and other media.

2）.  Superior Thermal Stability:

     Exceptional high-temperature resistance, with an operating temperature up to 800°C and short-term tolerance up to 1600°C. This makes it indispensable for applications like high-temperature flue gas filtration and molten metal filtration.

3）.  Outstanding Mechanical Strength:

     Possesses high compressive strength, flexural strength, and hardness. It offers good wear resistance, a long service life, and can withstand significant pressure differentials and the impact of frequent backwashing.

4）.  High Filtration Precision and Cleanliness:

     Uniform pore size distribution allows for manufacturing at various precision levels, from micron to nanometer scale (e.g., 0.1µm to 100µm). It effectively removes fine particles, ensuring high cleanliness of the filtrate.

5）.  Good Permeability and Low Flow Resistance:

    Due to its high open porosity (typically 30%-50%) and interconnected pore structure, it offers low fluid flow resistance, high filtration speed, and relatively low energy consumption.

2. Main Application Areas:

Silicon Carbide filter tubes have a wide range of applications, primarily in the following fields:

1).  Chemical and Petrochemical Industry:

   Catalyst Recovery:Filtering precious metal catalyst particles from reaction liquids.

   Process Gas Purification: Removing dust and liquid droplets from syngas, tail gas, etc.

   Fine Filtration of acids, alkalis, solvents, etc., to ensure product purity and equipment safety.

2).  Environmental Protection (High-Temperature Flue Gas Treatment):

    Dust removal from high-temperature flue gases produced by incinerators, coal-fired boilers, cement kilns, etc. It is the core material for high-temperature ceramic filter candles, operating directly at high temperatures, eliminating the need for cooling steps, offering high efficiency and the ability to handle sticky dust.

3).  Metal Smelting and Foundry:

   Molten Metal Filtration: Purification of molten aluminum, copper, iron, etc., to remove non-metallic inclusions (such as oxides, slag), significantly improving casting quality.

   Often used in pouring systems in the form of honeycomb blocks or porous bricks.

4).  Pharmaceutical and Food Industry:

   Used for precision filtration and sterilization of pharmaceutical liquids, fermentation broths, syrups, beverages, edible oils, etc., benefiting from its clean and non-contaminating properties.

5).  New Energy and New Materials:

   Used in the production processes of polysilicon, lithium battery cathode/anode materials, etc., for slurry filtration and recycling valuable nano-powders.

3. Common Forms of Silicon Carbide Filter Tubes

1)Single Tube: Standard tubular shape, often with flanges or tapered ends for easy installation and sealing.

2)Honeycomb Block:Contains numerous parallel channels, primarily used for molten metal filtration, offering high flow rates.

3)Multi-channel Tube (Candle Filter Element): Candle-like shape, closed at one end, with numerous micropores in the tube wall. This is the most common form in chemical and flue gas treatment applications, assembled into large filter units.

4. Precautions for Use

1).  Installation and Sealing:Handle with care during installation to avoid impact. The sealing structure must be well-designed to prevent fluid bypass.

2).  Thermal Shock Sensitivity:Although silicon carbide has good thermal shock resistance, sudden temperature changes (e.g., instantly introducing cold fluid into a hot filter tube) should be avoided to prevent cracking.

3).  Clogging and Cleaning:

   Physical Cleaning:Using compressed air back-pulsing, ultrasonic cleaning, reverse flushing with pure water, etc.

   Chemical Cleaning: For chemical fouling, acid or alkali solutions can be used for soaking and cleaning, utilizing its corrosion resistance for thorough regeneration.

4).  Differential Pressure Control:Monitor the inlet-outlet pressure drop during operation. A high pressure drop indicates an overly thick filter cake or tube blockage, prompting timely back-pulsing for regeneration.

 
Technical Data