Greystone

Greystone Sand Washing & Classifying Solutions.

Single & twin, fine and coarse material de-watering screws
Sand classification tanks with PLC controlled multi-blending system
Single or twin jet systems
Radial stackers and conveyor systems
Log washers
Blade Mills
Cutter heads

Follow this link to read about a successful project utilising Greystone Logwashers.

Follow this link to the Greystone website

World Class Sand Classification

The new windows based Aggre-Spec V6^TM Re-Blending System offers greater computing powers, efficiency and ease of operation than any other system currently available in the World.

Designed and manufactured by Columbus, Nebraska based Greystone Inc the Aggre-Spec 111 system was originally introduced to the American market in 1993 as the first windows based system in the world. Since then Greystone have developed their range of Aggre-Spec classifying systems and now offer the Aggregate Industries a ‘cutting edge tool' which offers even greater control and efficiency, ultimately providing the producer with tighter specifications and increased production.
The Aggre-Spec111 system uses three methods for re-blending the sand, the conventional method applies to most sands, the coarse method optimizes the output from coarsely graded feeds and the fine method optimizes finely graded feeds.

Their latest version of the patented Aggre-Spec V6^TM sand washing and classifying plant re-blending system, provides plant operators with a consistently maintained production of specification sand products, and the ability to store unlimited recipes and specified products within an automated Windows® -based controls system offering greater computing power and more user-friendly visuals on one screen.

The advantages of the system are that it is percentage based; other DOS based systems generally use minimum and maximum timers, the Aggre-Spec system provides a 2% yield advantage due to the faster reaction time of the percentage method versus the minimum/maximum timer method. Additionally the system allows a stockpile sample to be inserted into the program which adjusts the calculations to bring the output into even tighter control.

Producers can now scalp excess water, reject excess material, separate and size sand particles and re-blend up to 3 sand products including 2 controlled specification sand products simultaneously using single or twin tank controls, and achieve an increase in production by up to 15% over programs using single-method systems.

The user-friendly Aggre-Spec V6^TM control program is designed for exclusive multi-tasking with other Windows® programs for data logging, trending and reporting, allowing operators to view both products on the screen at the same time. Its user-friendly design enables simple, immediate product specification changes without searching for "hidden" command keys of DOS-based re-blending systems.

The system holds tight product specifications and reduces the possibility of out-of -specification material, automatically monitoring feed material to warn the operator of any potential mix or mechanical problems. Additionally plant management can also observe trends and predict potential sales with accurate production records.

The Aggre-Spec V6 is accessible from a laptop, so producers have seamless control of their operation from any vantage point. Displaying real -time FM and yield graphs a stock pile analysis checks finished product against expected products and input settings. Furthermore a report module collects data, including FM, yield, feed gradation and output gradation, and stores in spreadsheet format for flexible reporting

Additional features include:

Unlimited mix design storage capacity
Multi-tasking capabilities with other Windows^TM based programs whilst re-blending specification sand products
Simple, ‘single-step' product specification changes eliminate wasted time searching for hidden keys
Easy calibration
Percentage retained or passing display options
Customised sieve series
Flow Watchdog^TM
Specification modification on main screen, avoiding multiple views
Station overrides
Automatic cleanout routine can be programmed by user
Factory field training and initial calibration included

As good design is imperative long life wear parts are also an important part of the in-built quality that the Greystone classifying systems have; the classifying tanks now come with new urethane discharge valves, the seats offering self-alignment which keeps the valve centred in the seat providing maximum flow and a long trouble-free life. With the introduction of these valves producers can now achieve 25% more production from their classifying systems and again these can be retrofitted to existing systems. Urethane is also utilized in the directional discharge boots, producing maximum flow with the optimum angle to reduce wear of the flume's abrasion-resistant lined bottom runners, urethane allows for maximum boot wear.

Other design features include abrasion resistant liners in the feed box, rising current cells at the first three stations to improve classifying efficiency and a collecting flume which is fitted with abrasion resistant liners (urethane liners optional). Additionally the valve bridge utilizes stainless steel hydraulic tubing, allowing high pressure fluid to move the valves to open and close rapidly, allowing for an overall better response to the control system.

With over 30 different classifier configurations to choose from, any system can be custom designed to suit specific application and production requirements. Retrofit is also available to most existing classifying systems from other manufacturers.
Greystone Inc has been building washing equipment for 35 years and has over 80 classifying systems operating in North America, 1 in Holland and 2 in Europe.

DUO (Europe) plc is the UK distributor for Greystone.

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