FAQs

The down side to dry screening is that if the material is damp or sticky you will not be able to achieve clean in spec material. Your throughput will also be very low. By rinsing rather than dry screening you will guarantee an acceptable throughput and also the correct specification as long as there is little or no clay in the deposit.

The Finesmaster range of sand plants has the facility to blend the fine and coarse sands, giving the customer optimum specification. This mechanical blending maximises the production of the higher value product. Sand is initially sized on the rinsing screen which means the sand plant is not relying on density separation to grade material. The range includes plants with or without buckets depending on customer requirement. The addition of buckets reduce the size of pumps and motors, thus reducing power consumption. The moisture content in the sand is generally as low as 10% – 12% once it comes off the high frequency dewatering screen.

Yes, the PowerX Equipment systems are designed to use minimal water. However to achieve this you would need to incorporate a PowerX Equipment Water and Silt Management System.

At PowerX Equipment we have a range of Powerscrub logwashers ranging from 60 to 200 tons per hour capacity. The interlocking blade system that has been a feature of the Powerscreen design for over 10 years has a scrubbing action which is second to none in the marketplace and guarantees a clean clay free product. The “R” designed logwashers have the facility to float out lightweight materials such as wood, paper, plastics and organics from either virgin or recycled aggregates.

Quarry dust can be sold as a sand but due to its low quality and high silt content it is suitable for few applications. Quarry dust can be washed to remove the silt and clay content and create a natural sand substitute that is of concrete sand specification.

Our range of Powerscreen sand plants are a simple and effective way of processing quarry dust. We have installed a number of these plants, all of which have been very successful.

The beauty of the PowerX Equipment range of washing equipment is that it is of modular design. This means that as your requirements change, so can your plant. We have a range of different sized screens, logwashers, sand plants and conveyors, which can be installed as required.

No, PowerX Equipment has a full range of water and silt management systems, which are tailored to customers individual needs. We have plate presses, belt presses and centrifuges as well as thickeners of varying sizes designed to your personal requirements.

The first thing to do is contact PowerX Equipment and arrange a FREE site survey. An experienced Sales Engineer will visit your site and complete and discuss all the relevant areas such as your requirements, planning and environmental issues. We have over 30 installations in the UK which process recycled aggregates and can answer any question you may have, based on our individual and company knowledge. The plant will then be “Tailor Made” to suit your needs and the physical attributes of your site. Not everyone has acres of space and in the past we have installed full processing plants into small areas. 

The plant will be made from our range of screens, logwashers, sand plants, conveyors and water and silt management equipment which incorporates plate presses, belt presses, centrifuges, thickeners and flocculent mixing and dosing equipment. PowerX Equipment will supply a dedicated engineer to the project from start to finish, to liaise with you and your site and ensure that all risk assessments and method statements are result in a safe installation.  You will be supplied with a delivery and installation schedule so you can plan ahead keeping your customers informed. 

Once you have chosen PowerX Equipment you are part of the team.

The capacity ranges from as little as 1tph right up to 30tph of dry solids. Gennaretti’s centrifuge range has been designed specifically to handle larger quantities of silt than similar size machines from other manufacturers. This is a result of over ten years research and development in to processing silts from aggregate washing.

Centrifuges separate solids and liquids using ‘centrifugal force’. Centrifuges contain a cylinder which rotates at a high rpm. Inside the cylinder a screw rotates at a lower rpm thus creating the centrifugal force required for separation.

Thickened slurry is pumped into the centrifuge for separation. The centrifugal force pulls less-dense materials (water) toward the axis of the centrifuge whilst more-dense particles (silt) are propelled away from the axis. The result is water suitable for reusing in the washing process and a cake that is dry enough to handle so it can be disposed of.

Gennaretti is a leading centrifuge manufacturer with over 30 years’ experience offering a range of centrifuges for different sized applications. Gennaretti is so confident in its products, that it offers a 5000 hour warranty on its main wear parts.

It is possible to take the dirty water direct from the cyclone overflow on the wash plant subject to the volume and the size of the centrifuge. A centrifuge will usually require a generator to operate the machine and pumps and pipe work for the dirty water and centrate water.

This thickened sludge can be pumped to a lagoon or alternatively it passes to the second stage which is dewatering the sludge to produce a dry manageable cake and recycle the centrate water back into the washing process.

This thickened sludge can be pumped to a lagoon or alternatively it passes to the second stage which is dewatering the sludge to produce a dry manageable cake and recycle the centrate water back into the washing process.

The performance depends on the construction of the system itself and on the process parameters. The construction variables are; speed rotation, volume available and the speed extraction of the solid. The process variables are; speed feeding, solid specification, batches of chemical and working temperature.

Through our experience of installing centrifuges and with the support of Gennaretti, the manufacturers of the industry leading centrifuges that we offer, all of our installations are designed to meet the requirements of individual projects.

This will very slightly depend on the characteristics of the feed material. Typically the cake will range from 35% to 45% moisture which can easily be transported. This cake will continue to dry further when left outside.

Filter presses contain a series of polyurethane plates. Each plate has a recessed chamber and feed port and is covered by filter cloths. The plates are pressed together with hydraulic rams under high pressure.

A sludge feeding pump fills the void spaces between each plate and forces the water to filter through the cloths and exit the press.

The solids are held in the void space between each plate until the water has drained and produce a dry cake. The press automatically opens and the cakes are discharged.

Filter presses are size specific for each application and the filtering time of the sludge. There are a wide range of sizes available from machines that process 50kg per hour up to large presses which discharge 20 tonne per hour.

This very much depends on the type of sludge being filtered. If the sludge is of a coarse nature and free draining, like granite silt or silt from stone cutting, this will filter in minutes and the press will complete several complete cycles per hour. If the sludge contains a high percentage of clay this will slow the dewatering process and will normally mean cycle times in the region of one hour.

Due to the quick opening and closing times of the presses offered by PowerX Equipment the non-productive time is minimised and the processing time is maximised.

This will vary depending on the type of silt, size of silt particles, type of cloth and maintenance of the cloths. When processing slow filtering sludge the cloths will need to be cleaned more often.

PowerX Equipment will supply the correct type of filter cloths material following trials on sample material and will provide guidance on the cloths specific to each application.

The performance is affected by the following parameters; type of sludge, feeding pressure, feeding pump wear, type of filter cloths and wear of filter cloths, cleanliness of filter cloths, type and quantity of flocculent used. With regular maintenance the filter presses performance will remain consistent.