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They are manufactured in standard rolled and pressed metal sections. Materials are selected depending on the operating conditions and include:
This belt supports the filter cloth and provides drainage channels and holes for filtrate removal. All our transporter belts have a carcass free center zone to ensure long life by preventing contact between the carcass and corrosive filtrates.
There are different grades of rubber available for various duties. Depending on the application we select between:
The grade of rubber, filter application and site conditions will normally determine the type of splice required. As a general guide:
Rubber curbs are bonded or vulcanized to the edges of transporter belt to prevent the inadvertent spillage of feed material cake wash water. They also serve as vacuum seal.
Our vacuum box design ensures that it is suited for both the process conditions as well as the mechanical stresses found in the most extreme applications. Vacuum boxes are available in the following materials:
The concept of wear strips and wear belt for vacuum sealing has been adopted by all major belt filter manufacturers around the world. Wear strips are made from highly wear resistant, low friction material and are attached to the vacuum box shoulders to locate loose wear belts.
This can be affected in a variety of ways depending on the application of the filters.
High extraction efficiencies greater than 99.8 % can be achieved when a flooded level of solution is maintained in the wash zone, allowing plug flow displacement. Efficient separation of wash zones from the filter table, spreads in the vacuum box and a patented slope on the filter. By ensuring that no forward leakage occurs, the client is assured of maximum liquor concentration and recovery.
Co-current washing in several stages gives excellent washing efficiency when filtrate dilution is not critical and two to three displacement washes are common.
This method is used when down-stream treatment of filtrates requires minimum dilution such as solvent extraction, evaporation or when limited washwater is available. Both cake filtration and vacuum box zones can be effectively and easily divided to give optimum washing.