Pit & Quarry, April 2012

EQUIPMENT FOCUS CONVEYING MATERIAL HANDLING Large volume stockpiling The telescoping conveyor consists of a stinger conveyor mounted inside an outer conveyor of similar length The stinger conveyor has the ability to move linearly along the length of the outer conveyor thereby varying the location of the discharge pulley The height of the discharge pulley is variable as is the radial position of the conveyor The three axis variation of the discharge pulley is essential in making a layered pile that overcomes material segregation Automated telescoping conveyors provide increased stacking capacity over standard radial stackers Up to 30 percent more material can be stockpiled under a telescoping stacker according to Superior Industries The latter is particularly key to the operations at Preferred Sands Arizona facility where two TeleStacker conveyors are stockpiling what the company refers to as its work in progress stockpiles which contain its most desirable premium coarse silica sand materials that are generated from the first major cut out of the wash plants Then Superior Industries stationary conveyors versus the former use of loaders transfer materials from the work in progress stockpiles to the drying plants Since the wash plants operate for only up to eight months per year the TeleStacker conveyors are instrumental in creating the larger volume stockpiles required to carry the operation The view from the top of one of two screen plants shows construction crews continuing installation at Preferred Sands Arizona operation through the winter months These require the availability of 166000 tons of material each month to be transferred to the drying plants to meet demand for finished product In pit flexibility At its Nebraska based mine Preferred is reducing loader use through the application of Superior Industries portable jump conveyors which are sometimes referred to as grasshopper conveyors as they can be set up to piggyback onto one another in various configurations Stackable for cost efficient transport jump conveyors allow flexibility in the pit as each unit can Since the wash plants operate for only up to eight months per year the TeleStacker conveyors are instrumental in creating the larger volume stockpiles required to carry the operation through the winter months be removed from the line one at a time as the stockpile grows Also these units are engineered with adjustable height axle systems which allow accurate feed into varying feed heights Doyle likes the fact that the operation can string the units together as needed They are very maneuverable and we can set a pivot point or a stationary point within our mine and then use these jump conveyors to get out into different parts of the mine as required giving us further reach and reducing the transit distance for any loader use he says Having an electric powered conveyor that is transporting sand in a very efficient manner is certainly an advantage over a loader that is burning between 9 and 12 gallons of diesel fuel per hour PQ Carol Wasson is a veteran freelance writer for the aggregates and construction equipment industries How is your productivity AggFlow has been tremendously useful to optimize our plant production It has also been very helpful in newplant design and is an extremely good teaching tool The program has multiple uses and is an excellent investment George Fox Process Manager Luck Stone Corporation AggFlow The industry standard plant Simulation and Analysis tool Benchmark Track Performance for the Entire Plant Conduct unlimited What If Scenarios Develop favorite Operating Modes and change Modes instantly Analyze Your Business Using an Independent Universal Proven Tool Find out why all the top producers and dealers use AggFlow Visit us at www aggflow com Refer to this advertisement and receive a 15 DISCOUNT on all initial purchases Standing corporate discounts excluded 14 PIT QUARRY April 2012 www pitandquarry com