Press Filters
AMP® Filter Presses are used in the dewatering of sludge from the washing of aggregates and minerals after sedimentation in a Thickener Tank. In the filtration process it is possible to recover most of the residual water contained in the concentrated pulp obtained in the discharge of the thickener.
In the Filter Press a cake is obtained with a minimum humidity that can be handled and stored without problems, eliminating in this case any liquid effluent, thus giving the best environmental solution to the aggregate or mineral treatment process.
The experience of AMP engineers in solid-liquid separation technology and more specifically in the filtration process is attested by the numerous installations supplied mainly to the metal mining, industrial minerals, construction, environmental, and in particular to the ceramic, glass, marble and granite industries.
The specification of the suitable filter press according to the variables of the process, involves the realization of filtration tests to be implemented in pilot plant, at laboratory scale or in field work. Based on the data obtained in these tests, the filtering surface is determined, which is defined by the size and number of plates that the filter press must incorporate, which is sized with a greater margin in anticipation of an eventual future expansion of plates, which would be done with a minimum investment.
AMP offers a range of filter press models based on the plate sizes standardized by the main manufacturers. The dimensions of the filter press, with supported or suspended plate, will be those resulting from the plate size incorporated, number of plates and requirements of the filtering area, as well as the cake volume.
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Process Solutions
Solutions by Industry
Construction
The Filter Press is composed of a frame formed by two very robust end walls, joined by two lateral beams or by elevated beams, depending on the lateral or upper dragging of the plates.
The filtering package is composed of polypropylene plates with lateral supports or trolley if suspended. Monofilament polypropylene, polyester or polyamide cloths, according to the nature of the pulp to be filtered.
Electro-hydraulic device by double-acting piston acting on the moving plate, which causes the simultaneous opening of all the plates in the “Cam” filter model or plate by plate by means of the individual plate dragging system in the “Shifter” model.
Optional anti-drip tray for collection of filtration water and cloth washing water, if the filter press is equipped with this automatic device.
Set of pipes for filter press feeding, filtrate collection, aeration and cloth blowing.
Electro-pneumatically operated valves for pulp and air circuits.
Hydraulic power unit consisting of oil tank, high and low pressure pumps, valves and distributors for the operation of the elements that make up this set.
Automated control system that controls the various stages of operation of the filter press, such as sludge feeding, cake discharge and evacuation, compressed air blowing and cloth washing (optional). Safety device for opening/closing by pull switch.
Control cabinet, programmable by PLC with dialogue screen and all the accessories and measuring and control elements for the operation of the filter press.
Functioning
The filter press in the filling cycle is closed, and the pulp feed is usually done by a centrifugal pump controlled by a pressure sensor that progressively increases the pump speed, until the filter press is filled to the required pressure in the shortest possible time. The filter press can also use piston/membrane pumps for high pressures up to 1600 kPa.
At the end of the filling cycle, which is detected by sensors that monitor the flow rate of filtered liquids, the feed valve to the filter press closes and blowing of air from the filter press core begins. A second air valve aerates the cloths to aid cake separation.
Subsequently, the opening of the filter pack is initiated and the cake discharge begins.
In the “Cam” filter press model, once the filter is opened, a cycle of plate shaking of variable duration is initiated depending on the nature of the solids being processed.
The filter press incorporates membrane plates when it is required to achieve maximum cake dewatering and reduction of filtering cycle time, resulting in increased filtration capacity.
Automatic fabric washing system after cake unloading, consisting of a frame installed on a mobile trolley on the upper beam that incorporates high-pressure spray tubes and wraps around the plate for fast and effective cleaning of the fabric.
Advantages
The design of our Filter Presses is characterized by high performance in terms of robustness, reliability, efficiency, operational simplicity and minimum maintenance, and offers the following advantages:
Fully automatic equipment without the presence of operators.
Fast opening system that ensures the maximum number of cycles.
Recovery of processed water with yields above 95%.
Dehydration of sludge or clays with minimum residual moisture depending on the nature of the material.
Minimum surface area required for installation.