SCREENING AND WASHING
composite screen decks due to the modular format of Multotec’ s two common panel sizes – 1 ft x 1 ft or 2 ft x 1 ft. This modular design allows for different types of panels to be placed in specific areas of the screen as part of the overall goal of achieving metallurgical efficiency on the screening media surface.
With the aim of reducing downtime for customers, composite deck designs must ensure that wear patterns are as even as possible, so that the mean time between failures( MTBF) can be extended and scheduled maintenance can be conducted as infrequently as possible.
“ Typically we want to ensure that customers can run these screens for six to eight months at least before they have to schedule maintenance downtime,” says Faba.
The deck map allows the best combination of panels to be placed to suit the conditions, the material and the output targets – employing panel types in materials including rubber, polyurethane, steel, woven-wire, ceramics, Hardox, fibreglass and combinations of these.
For instance, certain applications may demand the use of both ceramics and rubber; while a hard ceramic surface provides resistance to wear and cutting, rubber’ s elastic properties dampen the impact forces and protect the ceramic pieces.
“ The deck map allows us to specify, for instance, a set of panels comprising highly impact-resistant material at the feed end of the screen, where the impact of material from the feed box or chute is highest,” says Roy Roche, Vice President Screening Media at Multotec.
The performance of the panels is then meticulously fine-tuned through monitoring and iteration, using Multotec’ s market-leading Hawkeye technology, which allows management to systematically analyse the data from the deck maps to create a powerful planning system for ongoing application improvement. The screening requirements in each part of the deck can be constantly refined by tracking the performance of the various panel types on each deck in operation. Binder + Co says its BIVITEC flip flow screen comes into its own when conventional screening technology starts to be inefficient and uneconomical. Particularly challenging tasks are solved in a simple and efficient way. The BIVITEC flip flow screen ensures selective screening of bulk materials which are difficult to screen. With the help of resonance, a driving mechanism provides two vibratory movements in which the flexible polyurethane mats are expanded and compressed in turns, and the hard-to-screen product is separated at high acceleration. The dynamically agitated screen mats thus remain unobstructed and allow efficient screening. It is available as a multi-deck design with conventional upper, lower and intermediate deck. Rigid screen panels are on the upper deck for an
easy-to-screen grade, while the upper deck also serves as a protective deck. The BIVITEC Banana screen can be used for feed material containing a high percentage of fine grain material for screening at two cut points with one screen deck.
General Kinematics STM-SCREEN™ Two-Mass Vibratory Screens“ are built to work your material more thoroughly. This screen is load responsive with longer retention times meaning the material discharges from the screen better separated. The screens’ Two-Mass design delivers higher performance and eliminates the need for expensive belts, shafts, bearings, and dual inboard vibratory motors. This Two-Mass Screen also has the lowest cost of ownership available in GK’ s vibrating screen package. It offers maximum up-time with evenly spread energy and high structural integrity that is sure to prove its value. There are also customisable options to fit your specific needs.”
Its Two-Mass Banana Screens it says are ideal for those looking to reduce energy consumption while increasing the processing power of the line.“ The Two-Mass system requires up to two-thirds less horsepower than a brute force screen lending itself to being a much more energy efficient system. The Two-Mass Banana Screen does not have the maintenance issues associated with direct-drive designs. Best of all the Banana Screen is customisable with multiple decks, styles of screen surface, materials, and finishes, fitting into most applications and installation environments with ease.”
Gold mining is frequently facing a number of problems in mineral classification because the highest efficiency rate is demanded – especially nowadays with low gold prices – without reducing the life of the
The BIVITEC flip flow screen ensures selective screening of bulk materials which are difficult to screen
screening media. One of Eurogomma’ s clients involved in gold mining in West Africa was affected by the efficiency in their SAG trommel when deciding to use steel wire screens instead of durable products like rubber or polyurethane. In this scenario Eurogomma has created a polyurethane screen panel incorporating its PURFil screen mesh to give the same design of the woven wire screens previously used but made with durable polyurethane material.
McLanahan MAX Series
The MAX Series Vibrating Screen is based on McLanahan’ s years of industry experience and is“ designed to meet and exceed the demanding applications and specifications that producers face.” Introduced in late 2016, this equipment already has several working installations that have proven to deliver the expected results.
The McLanahan MAX Series Vibrating Screens can separate coarse feed materials from finer materials and are offered in sizes and configurations ranging from 5 x 16 ft to 8 x 24 ft in triple, double, and single deck models. These screens are designed to provide maximum headroom between decks, making maintenance and media changeouts more convenient.
The McLanahan MAX screens were launched in late 2016 but have already proven themselves at several sites
16 International Mining | OCTOBER 2017