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Process for stainless steel sintered powder filter

Jul. 25, 2018

The physical regeneration process

Titanium Rod Filter Cartridge This process is suitable for filtering media. The particles have less impurities and the titanium filter plug is lighter. Such as: ozone disinfection filtration, air filtration, etc.

1. Backflushing: Reverse backflushing with pure water (deionized water) for 15 min, its backflushing pressure is less than 0.4Mpa, or backflushing with clean air (steam), and its backflushing pressure is less than 0.4Mpa.

2. Ultrasonic cleaning: Put the titanium rod into the ultrasonic cleaning tank, take it out after washing for 60 minutes, rinse it with deionized water or distilled water for 15 minutes, and then dry and sterilize.

 

Chemical treatment process

The process is suitable for the blockage of the titanium filter element is serious, and the composition of the filter medium is relatively complicated (such as decarbonization filtration, filtration with protein medium, high viscosity of the medium, etc.)

1. Alkaline washing process

Firstly, the new use or holiday shutdown time is longer. When used again, use 1% NaOH to analyze the alcohol solution for 30min, soak it in normal water before soaking, then put it into alkaline solution, soak it and wash it twice inside and outside with deionized water. Above, the time per time is not less than 30min, the water pressure is 0.2-0.3Mpa, and after flushing, it is placed in still water without any floating matter (light inspection), and the test PH value is neutral.

2. pickling process

A, the configuration of the cleaning solution:

Potassium dichromate (or sodium) 5% (dry)

Normal water 1000g

Concentrated sulfuric acid (industrial) added to 2000ml

B. System of law:

Take potassium chromate (or sodium) crystals or fine powder, dissolve in heated water 60-80 degrees, slowly add concentrated sulfuric acid (94%-96%) to a sufficient amount, start slowly when adding acid, stir while adding After adding 1200ml, potassium dichromate (or sodium) is completely dissolved. When the color changes from brown to dark red, the speed can be slightly faster until the end of the addition. If the acid has been added, it remains undissolved and can be reheated to dissolve. It is allowed to cool and sealed for use.

C. Pay attention to the following during the configuration process:

1. The cleaning solution can remove the general dirt, greasy and metal particles impurities attached to the wall, and can kill microorganisms and destroy heat sources. The alkaline washing solution must be washed before soaking the cleaning solution, otherwise fatty acid will be precipitated and the filter element will be contaminated.

2. If the reddish brown color changes to green in the cleaning solution, it means that the oxidation capacity is weakened and should not be used again.

3. If the acid concentration will be reduced to below 85%, the decontamination ability will be greatly reduced, so the amount of water in the prescription should not be increased.

4. When disposing the cleaning solution, add concentrated sulfuric acid to the potassium dichromate solution slowly and stir while stirring. Never pour water into the acid to prevent personal accidents caused by sudden heat explosion.

5. The cleaning solution should not be mixed with alcohol or caustic soda to avoid explosion.

6, the cleaning liquid is easy to absorb water, easy to close and save for future use.

7. After the cleaning liquid is configured, dilute it and use it when it is used. The solution concentration is kept at 2.5%-3%.

D, cleaning steps:

1. Take out the filter element;

2. Rinse the inner and outer walls with water for injection or filtered distilled water for 3 minutes at a temperature of about 60 degrees;

3. Blow dry water with compressed air (Note: Do not allow air to be mixed with oil and gas mist);

4, put in the cleaning solution (according to 2.5% -3% concentration) soaked for about 15min to remove;

5, rinse the inside and outside three times with deionized water or distilled water, the water pressure is 0.3-0.35Mpa, the temperature is below 80 degrees, and the normal temperature is also acceptable;

6. Dry the residual water of the component with hot steam and put it directly into the steam cabinet for sterilization for more than 40 minutes.

7. Clean with less water for injection and bake at 112 °C for 1 hour or more;

8, put into the sterilization box sealed protection;

9. Each bath has a bubble point test before use every day;

Third, the bubble test test:

1. The test liquid uses water for injection or filtered distilled water;

2, the liquid level is higher than the outer surface of the component 5-10mm;

3, the pressure of 0.2-0.3Mpa (gas is not allowed to contain oil mist points);

4. Observe the pore distribution and bubble point pressure after ventilation;

5. Observe that no air bubbles are allowed to occur at the threaded mouth and the head;

6. No air bubbles are allowed at the joint between the head piece and the filter element;

7. Rotate the 360-degree central axis in parallel with the horizontal plane for one-week inspection during operation;

8. Make a record of the inspection process and fill out the inspection form carefully;

9. note the batch number and use time, keep the file.


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