PLATE FILTER PRESSES FOR THE CHEMICAL AND PROCESS INDUSTRY
Although the working principle of solid-liquid separation within the filter press is the same, in the case of the chemical or process industry, the machines are built with slightly different arrangements.
Several aspects have to be taken into account, from the fluid management in the piping, to a whole range of optional extras to complete the filtration process.
The efficiency of a process machine must be considered by analysing all the variables at play during the filtration cycle.
There are many fluids that are easily filtered, but tend to settle and clog quickly inside the pipes; for this reason, the pipes cannot be at all those of a “traditional” filter press, but substantial modifications must be made that would otherwise not allow the machine to function properly.
Conversely, there are also other fluids that cannot be filtered properly with a canonical filtration process, and it is necessary to squeeze the membrane and blow compressed air to dry the cake and allow proper separation of the filter cloths.
In all these sectors, where the product of the filter press (which may be solid cake, filtered liquid or both) is of significant economic value to the company, it is necessary to maintain a high level of efficiency in the filter press.
For these reasons, filter presses in this sector are normally all equipped with automatic cloth washing systems, either high pressure or acid washing with flooding.
The choice of the right materials also plays an important role; the chemical compatibility of the wetted materials with the fluid to be filtered must be considered, just as the coating cycle plays an important role in ensuring the durability of the machine even in the hardest environments.