Filter presses are one of the oldest filtration technologies still in use today. Used in many product manufacturing process systems and effectively manage waste separation. They may be required to recover water or other solutions from process or waste streams, and/or to produce or recover dehydrated solid materials.
When it comes to efficient, trouble-free dewatering operations, these details matter, from the right filter cloth, to the right filter plate, to the press itself, to your preventive maintenance program.
Here’s what you need to know when maintaining filter plates from Evergreen.
Inspection Before Use
Before use, carefully check whether each connection is firm, whether each component is in good use, check the number of frames, plates or diaphragm plates and the sequence in the machine; and move all frames and plates to one end of the thrust plate, so as to ensure that the The filter plate will not deviate during the pressing process. Use a non-metal filter cake scraper daily to inspect the sealing surfaces for solids buildup and remove solids from the filter cloth.
When Using
Use the equipment correctly, especially do not open the box filter press on an empty stomach, otherwise the filter plate will be easily deformed, damaged, or even paralyzed.
After Use
If it is not used for a long time, the filter plate should be cleaned and neatly placed on the frame of the box filter press, and pressed with a pressure of 1 to 5MPa. The filter cloth is washed and dried in the sun; the exposed part of the piston rod and the integrated block should be coated with butter.
When Changing The Filter Cloth
Evergreen recommends a full pressure cleaning of all filter plates at every filter cloth change. We recommend using a 2,500 – 3,000 psi pressure washer to thoroughly clean sealing surfaces, web areas, filtrate ports, and filtrate drains. During cloth changes, a medium bristle brush can be used on all filtrate port areas. Use a non-metallic cake scraper to remove any cake buildup on the sealing surface of the plate. A clean sealing surface will minimize slurry ejection from between the filter plates and ensure that the filter plate stack and filter press frame remain square. When sewing the filter cloth, the damaged part should be cut off before sewing to prevent overlapping of the sealing surfaces and increase the thickness of the filter cloth. Evergreen offers a complete line of filter cloth accessories, including filter plates in our product line, to ensure the efficiency of your filter press operation and expand the efficiency of our filter presses.
Cleaning of Filter Plates
Remember that the sealing surfaces of the board must be kept clean and free of debris! Keeping the plate drains clean and free of debris will ensure maximum flow through the surface of the filter plate mesh. In addition, the filtrate discharge holes and filtrate discharge channels of the plate must be kept clean to maintain flow and to aid in the formation of a uniformly formed filter cake. Keeping the corner ports clean will help maintain proper filtrate drainage throughout the filter plate stack. As mentioned above, Evergreen recommends using a medium-bristle brush to remove any excess solids that have built up on the board.
Plates can crack, warp, or break and need to be replaced from time to time. While it is difficult to specify the exact number of plates to keep as spares, we are happy to work with you to develop the best spares program for your filter press operation. We want to make sure you have spare parts on hand to avoid filter press downtime. Contact us for a quote.