Introduction of silicon carbide ceramic membrane

What is silicon carbide material?

It is also known as emery or moissanite; there are two basic varieties of black silicon carbide and green silicon carbide. The crystal structure of silicon carbide is divided into hexagonal or rhombohedral α - SiC and cubic β - SiC. It is a promising material, capable of withstanding high temperatures and mechanical stresses, and corrosive environments. On the other hand, it has a high thermal conductivity and a low thermal expansion coefficient, potentially advantages characteristics during high-temperature membrane separations.If you want to know more about SiC material, we would like to recommend to you visit: https://en.wikipedia.org/wiki/Silicon_carbide

What is silicon carbide ceramic membrane?

Silicon carbide ceramic membrane is made from pure SiC powders by recrystallization technology at an extremely high sintering temperature of 2400℃,then formed the porous and asymmetric membrane structure, according to the membrane pore size difference, mainly proposed for liquid filtration applications by membrane separation technology as microfiltration and ultrafiltration. It is a kind of inorganic membrane with separation function, which is coated of SiC ceramic material as the filtration medium.

Typical configurations of SiC membrane products:

1.       Tubular

2.       Flat sheet plate

3.       Column type

Features and benefits:

1.Chemical stability

The SIC ceramic membrane is also a kind of semiconductor, the surface has negative charge in a wide PH range, the isoelectric point is near PH3, which belongs to impurity conductivity, the membrane can be used for long time in harsh environment of strong acid and alkali (PH value 0-14), good stability for most sewage, especially oil-water permeability (oil-free). Almost no etching with any solvent at 1500 ℃

2.High temperature resistance (800 ℃)

Due to the combination of high thermal conductivity, lower thermal expansion and high mechanical resistance. This enables shorter cleaning cycles at high temperatures without risking structural damage to the filtration media.

3.Durability

Good wear resistance and high hardness, with Mohs hardness of 9.5, second only to the world’s hardest diamond (Grade 10)

4.High flux rate,

The sintered neck between the silicon carbide aggregates is a phase changing process from solid and gas→solid, which makes the pore opening rate reaches up to 45%, and the formed filtering channel with strong connectivity, the pure water flux is as high as 3200LMH, water-loving and oleophobic. 

5.Easy Cleaning

Backwashing can easily remove surface contaminants, such as colloids, suspended solids and oil droplets. no limitation of cleaning schemes, such as traditional backwash, back pulse, and periodic chemical cleaning can be used.

6.Long lifespan

At least 10-15 years, which is 2~3 times longer than that of alumina membrane.

Application characteristics and range:

Using our patented preparation technology, our upgraded membrane products can efficiently and stably remove particle impurities, oil droplets, algae, MLSS, and other suspended solids, achieving the high-level effect of solid-liquid separation and liquid filtration. Meanwhile, you can also recycle your liquid and other potential undeveloped resources that may exist in your wastewater. On the other hand, if compared with the traditional hollow filer, polymetric, alumina or other organic ceramic membranes, your selection of our SiC membranes can reduce installation and maintenance costs as it is more durable, high thermal resistant, faster recovery time and then reduce downtime, in long-term consideration, it will achieve cost savings and can optimize your operation significantly. For more information of SiC membrane characteristics, please feel free to read the article here:https://jmfiltec.com/News-silicon-carbide-membrane/37 

Nowadays, as an ultrafiltration membrane, the SiC ceramic membrane has been widely applied in industries, such as bioenergy, new material, pharmaceutical and food production, drinking water, wastewater treatment and reuse, metal, coating, chemical, and textile industries.

Our technical team can support the application technology service, including the complete set of workflow design and project solutions, we are keen to share our experience and knowledge for your industrial application purpose:

* Drinking water purification, municipal sewage reuse, seawater desalination Pretreatment for RO system, urgent water supply.

* Chlor-alkali chemical brine refining, petroleum cracking catalyst recovery, coal chemical oil-water separation.

* Natural product extraction, clarification, impurity removal for food and beverage processing.

* Antibiotic separation, amino acid, organic acid purification for the pharmaceutical industry.

* Clean production of solar cells, graphene purification, and concentration for new energy/material field.

* Landfill leachate, sludge concentration, machinery grinding, and Cutting fluid reuse for environment protection.

Application case show from our cooperated customers:

2x0.5 m³/hr degreasing fluid, 2x1 m³/hr floating lotion reclamation and reuse

Sewage treatment plant 1 m³/hr concentration and reduction of cleaning waste liquid 

Integrated domestic sewage treatment equipment

Desulphurization waste water in power plant

MBR system

Column type membrane for RO pretreatment