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large throughput automatic clay filter press

large throughput automatic clay filter press

Solid liquid filtration: Understanding filter presses and ...

Filter presses have been in use for more than 100 years. Figure 2 shows an early example of a filter press in operation, in this case removing water from clay slurry in Cornwall, United Kingdom, before transportation to the potteries of the North of England. There are three essential elements to a filter press : A set of filter plates or elements. For example, over the years, these have been made from wood, cast metal and, most commonly today, from moulded polymer . The basic idea is that these elements, when pushed together, form a series of contained filter elements. Slurry passes into each of these chambers, under pressure delivered by a slurry pump, filtrate passes through a filter medium and the retained filter cake accumulates in the chamber. The filter medium usually a woven cloth, but often a nonwoven cloth or paper. The frame or structure. This must be designed to withstand the sometimes enormous forces which are trying to forc...

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The basic concept of the filter press , is used in applications as diverse as blood plasma purification through to the de watering of large tonnages of mining slurries. Clearly, the needs of these applications, in terms of size and for example hygiene, mean that the actual execution of these machines will vary massively. Commercial units vary in size from less than 1m2 to greater than 1000m2. Today, modern, fast acting filter presses dwarf the filter shown in Figure 2, containing hundreds of plates. In the near future, individual plates that are 3 metres square will become commonplace and tower above their operators. As will be discuused later, these machines are simply too large to be manufactured and then delivered from a central factory. While such machines closely resemble the filters from a century ago, certainly at first glance, they are now larger, more reliable, more sophisticated and, u...

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Filter presses are in operation throughout the process and mining industries and successfully de water huge quantities of solid liquid slurry. However, there are some particular points to look out for. Filter presses may contain a large number of plates, each with an individual cloth that may be difficult to reach for cleaning. If the material being filtered clogs, or blinds, the filter medium, then it may be difficult to maintain a decent throughput. If the cycle time is long enough, then it may be practical to use a disposable filter medium. Equipment manufacturers have developed cloth washing systems, but because of the inherent arrangement of a filter press, they can usually only wash one side of the cloth. If the cake sticks to the cloth, or is not heavy enough to fall of its own accord, then an operator must manually discharge the cakes, or a mechanism such as a cloth shaker used. Closing a plate pack onto undischarged cakes can lead to problems. If the particles in the slurry...

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The belt filter incorporates a moving cloth, usually moving continuously over a number of, but at least two, rollers. The motive force for filtration is usually provided by vacuum under the filter cloth. There are a large number of manufacturers and options available, although there are two main types: carrier belt and tray type. The carrier belt type incorporates a belt, usually made of rubber, which has a series of grooves to allow filtrate to pass and follows the cloth around the rollers . The other type incorporates a series of trays underneath the cloth. These trays are connected to the vacuum system and either follow the cloth or are fixed, with the cloth advancing, or indexing forward intermittently . One of the key benefits of belt filtration is that the entire process is taking place in front of you and it is simple to spot any problems as they occur...

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As before, there are some applications in which vacuum filtration generally, and belt filtration in particular, are not applicable. Some slurries will simply not respond if the motive force for filtration is to a pressure drop somewhat less than atmospheric pressure. There are some options for belt filters held in a pressurised housing , although these will be significantly more expensive than a basic belt filter. While the lifetime of the filter cloth on a belt filter can be long up to several years the changing of a cloth can be a long and specialised task on a large belt filter. The changing of a carrier belt even more so .

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The core idea of a belt filter can be implemented in a number of different configurations, meaning that counter current washing can be used . In this washing arrangement, the filter cake receives a number of passes of wash liquid . The outcome can be significantly better wash results with reduced wash liquid consumption. There is no theoretical limit to the number of stages, although law of diminishing returns and practicalities generally limit it to around five.

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In common with all filtration equipment, the filter medium is the component that has the greatest bearing on the outcome of the separation process no matter how sophisticated or expensive the machinery that holds it in place and contains the motive force for filtration. There have been great advances in filter media for both types of filter. These include the use of novel materials, weave patterns, surface treatments and fabrications, all aiming to improve performance, in terms of lifetime, filtration outcome or cake discharge. Many of the modern forms of filter press and belt filter would not be possible, or would seriously underperform, were it not for these advances. For belt filters in particular, multi layer weaves offer a very fine surface to give excellent filtration performance combined with the strength of a coarser backing weave to convey the cake. Modern belt filters may require cloths that are more than 200m long and 4m wide. These cloths must be...

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Solid liquid filtration duties are becoming more challenging. For example, metal ores need to be ground finer in order to liberate the metal bearing minerals. At the same time, the demands for efficiency and product quality are constantly increasing. There is a strong pull from the market for larger single units, smarter process control and ever lower production costs, while new technologies push advances in manufacturing technology, process control systems and filter media. Control systems are critical. The success of a filtration plant often depends crucially on the drive and commitment of a small number of people. There is simply so much that can go wrong with pressurised slurries, cakes and jets of pressurised air carrying solid particles. A stray piece of filter cake may sit and harden for a few days before dislodging and getting underneath a cloth roller or on a plate pack sealing surface. Both of these situations could lead to significant cloth damage. Increasing demand for m...

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Returning to Figure 1, it is possible that either, or even both, of these filters will provide the process outcome required. There can be no hard and fast rules, but the outcome of the decision is more likely to be successful if it is: Based upon evidence: Tested at laboratory and pilot scale Researched, with reference visits and interviews with other users Considered in business terms how are the overall economics of the process affected by the filtration process outcome? Do not limit this simply to the cost of filtration itself, but include upstream and downstream costs, such as raw materials, drying, transportation, waste treatment and environmental impact. Carried out in a timely manner. Too often filtration is not considered deeply enough during the development and plant design for a new chemical product or mining resource. As a result, the supplier with the best delivery time may win. Filter presses and belt filters account for a large proportion of the world39;s solid...

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