How to extend the service life of ceramic filter plates？

The core of extending the service life of ceramic filter plates is correct maintenance, standardized operation, and precise selection. Through scientific daily management, the service life can be effectively extended by 30% -50%. The specific methods are as follows:

1、 Standardize operation and use to avoid damage

Preheating before installation to prevent cracking: When used for filtering high-temperature melts such as aluminum, the filter box and filter plate should be uniformly preheated to not less than 260 ℃, close to the melt temperature, to avoid cracking caused by thermal shock before use.

Reduce external disturbances during the filtering process: Avoid knocking or vibrating the filter plate during casting or operation, keep the flow channel filled with fluid, and reduce damage to the ceramic structure caused by disturbances.

Regularly calibrate component clearances: Check the clearance between the ceramic filter scraper and the filter plate every month, adjust it according to the discharge efficiency, and prevent the scraper from scratching the surface of the filter plate.

2、 Scientific cleaning and maintenance to avoid excessive corrosion

Select the right cleaning agent based on the blockage

Acidic cleaning agent with appropriate concentration of rust/metal oxide (oxalic acid preferred) | Do not soak for a long time to avoid corroding the edges of micropores|

Organic oil stains/silicates | Alkaline cleaning agents (pH 10-11) | Not recommended for calcium scale cleaning|

|Daily maintenance/mild blockage | Neutral and environmentally friendly cleaning agent | Prohibited from using high concentration strong acid and alkali indiscriminately|

Note: Cleaning agents containing hydrofluoric acid are absolutely prohibited for glazed ceramic panels.

Control cleaning frequency and time

Routine backwashing should be done every 8 hours, deep cleaning should be done every 72 hours, and cleaning should be done in advance when the vacuum degree is abnormal;

Strictly control the duration of chemical immersion: nitric acid immersion should not exceed 30 minutes, severe pollution immersion should not exceed 12 hours, excessive immersion can damage the ceramic microporous structure;

The frequency of chemical cleaning should not be too high, only once every few months to avoid frequent corrosion of the ceramic substrate.

Proper drying after rinsing: After cleaning, the filter plate must be rinsed to a pH value of 6-8 (neutral), naturally air dried or dried at low temperatures, and high-temperature baking is prohibited to prevent micro hole deformation.

3、 Daily monitoring and idle storage standards

Pay attention to changes in operating parameters: closely observe the pressure drop and flow rate changes during daily operation. When the pressure drop abnormally increases and the flow rate significantly decreases, promptly check for blockages and clean them to avoid damaging the filter plate after the blockage worsens.

Do a good job in idle storage management: Idle filter plates should be stored in a dry and ventilated environment, with a temperature controlled between 5-50 ℃ and humidity not exceeding 80%, to avoid the growth of microorganisms or structural corrosion on the surface caused by moisture.

Timely repair of minor damages: If tiny pinhole defects with a diameter less than 0.5mm are found, UV curing glue can be used to quickly seal them to prevent the defects from expanding and causing the filter plate to be scrapped; Local defects can be filled with specialized repair resin.

4、 Selection and matching of working conditions

High purity alumina and silicon carbide materials are preferred for highly corrosive working conditions to avoid the problem of low purity brown corundum materials being easily corroded;

When filtering strong acid media, acid resistant ceramic materials are preferred, and filter plates suitable for stainless steel substrates are used in alkaline environments to avoid material incompatibility and accelerated aging.