Cake buildup can cause bending of the press frame. Excessive bending can lead to equipment failure. So we need to keep the filter cloths and filter plates as clean as possible, especially along the sealing surface. So, today let's share how to clean the filter cloth of the filter press.
1. Clean filter cloths of all external material with a nylon cleaning spatula.
2. Close the press.
3. Disconnect the center feed line from the sludge pump.
4. Connect the outlet of the acid pump to the center feed line of the press.
5. Connect the filtrate discharge outlet of the press to the re-circulation tank.
6. Open the feed line to the press.
7. Start the feed pump. It may take considerable time to fill all the chambers of the press before the solution returns to the storage tank. Continually inspect the press for leakage during filling and circulation.
8. Allow the solution to circulate for one to two hours.
9. Turn off the feed pump.
10. Perform an air blow-down to purge any remaining solution from the press.
11. Disconnect the wash system and re-install the sludge pump and outlet lines.
12. Normal filtration cycles can now be performed.
13. The plates can also be "dip washed" by immersing them in a tank of solution. The immersion method is less efficient than through-washing in the press and will require a longer soak time. The plates will also float and require some method to keep them submerged.
Keep the following in mind when scraping cloths:
Use care not to cut or rip the cloth.
Cloths deteriorate over time and become more fragile and susceptible to tearing.
Make sure the edge of the spatula is smooth.
Do not tap the spatula on hard objects to remove cake from the spatula surface. This may form dents or tears in the spatula surface that can tear cloths.
Lodged particles must be removed periodically to maintain high filtration rates and dry cakes. A high-pressure, cold water, spray unit with a capacity of 800-1200 psi (55-80 bar) and 2-10 gpm (8-38 lpm) should have sufficient capacity. A broad spray nozzle should be used at a safe distance. If the pattern is too intense at a close distance, the cloth weave may be forced apart, leaving openings that allow sludge.
If high-pressure washing does not improve performance, carefully pull back a corner of the filter cloth and check the drainage area and discharge parts of the plate for solids buildup. If there is any buildup, the cloths must be removed, and the plates and cloth backs cleaned. Excessive buildup causes slow filtration cycles and can lead to plate breakage.
If more thorough cleaning is required, you can use a chemical process to dissolve the entrapped particulate.
Any further questions, Dazhang Filter will be honored to serve you !