Filter Press FAQ

To select the filter press model, usually it needs:

• The kind of slurry going to be filtered.
• The capacity per hour or day.
• The solid percentage in the slurry.

Then calculate the approximate filtration area of the required filter press based on the processing capacity and solid percentage, and then select the appropriate model according to the parameter table.

Installation

The installation of the filter press includes lifting and installation of the entire machine, installation of electrical control parts and installation of pipelines.

When hoisting the whole machine, a crane should be selected according to the quality of the whole machine indicated on the nameplate of the filter press. Lift the filter press on the foundation, use the horizontal line and diagonal line as reference, and ensure that both ends of the center line of the anchor bolt are on the same plane. Tighten each bolt of the filter press frame to ensure a tight connection. Electrical installation work must be completed by a professional electrician. The installation of pipelines can be arranged according to the actual conditions of each site. The installation, use, and maintenance of pipelines must be convenient, the pipelines cannot be connected incorrectly, and the pipelines must be as short as possible.

Debugging

The debugging of the filter press includes debugging of the whole machine, debugging of electronic control hydraulics and debugging of the filtration part.

Check whether the power supply, compression and return oil pipes are installed correctly, check whether the filter plates are arranged neatly, and check whether the filter cloth is installed with folding phenomenon, etc. Jog the motor and observe whether the motor rotation is in the same direction as the external mark. Press under different pressure conditions Tighten the filter plate and observe whether the machine is normal. Finally, tighten the filter plate and maintain pressure. Open all liquid outlet valves, open the feed pump gate about a quarter, start the feed pump, and observe whether the changes in filtrate and feed pressure are normal.

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If it is an ordinary filter cloth, roll up one side of the filter cloth and pass it through the feed port in the middle of the filter plate, then straighten both sides of the filter cloth and tie it with a tie. Finally, check whether the feed port on the filter cloth is aligned with the one on the filter plate.

If it is a gasketed filter cloth, lay the cloth flat so that its center is aligned with the center feed hole of the plate. Press the sealing edge of the cloth into the groove of the board to complete the installation.

The moisture content of the filter cake of the filter press has a great relationship with the sludge type and treatment process. It is impossible to generalize, but there is a rough range for reference. The moisture content of the filter cake squeezed out by the plate and frame filter press can usually reach 50-75%, the moisture content of the filter cake by the membrane filter press is 30-60%, and the high-pressure filter press can squeeze the filter cake until the moisture content is less than 30%. 

The entire process of the filter press goes through four stages: feeding, filtering, squeezing, and discharging. Therefore, if you want to greatly reduce the moisture content of the filter cake, in addition to choosing a suitable filter press, you can also reduce the moisture content by increasing the pressing time.

Filter presses are remarkably versatile and can be used to filter a wide range of slurries. The type of slurry that a filter press can handle typically depends on its physical and chemical characteristics. Here are some common types of slurries that are effectively filtered using filter presses:

Mining and Metallurgical Slurries: These slurries include tailings or fine particles of mineral ores and concentrates.

Food and Beverage Industry: Filter presses are used in the filtration of edible oils, sugar, beer, wine, and other food-grade products where purity and quality are essential.

Chemical industry: Separation of solid impurities and liquid solutions, such as separation of chemicals such as sodium sulfite, chlorine, and acetic acid.

Sand washing: treatment of sand washing wastewater such as machine-made sand, water-washed sand, stone powder sand washing, pebbles, and sand washing fields.

Pharmaceuticals: Used for the filtration of active pharmaceutical ingredients and other intermediate products.