Stackers and reclaimers are used in stockyards to stack minerals, ore, and other granular raw materials in piles, and then redistribute them for processing and shipment. Stackers are used to produce these large piles or circular stacks. Reclaimers are used to collect and redistribute the material from stacks or piles of bulk materials.
Typically, stackers and reclaimers are used in metallurgy and mining; cement, chemical, and power production; and at terminals that handle bulk materials. The materials handled include alluvium, coal and coking coal, clay, gypsum, lignite, limestone, potash, petcoke, phosphates, slag, and sulphur. Specialized stacking equipment and reclaiming equipment is available for bulk materials with abrasive properties, high humidity, and frozen or compacted materials.
Types of Stackers and Reclaimers
There are many different types of stackers and reclaimers. Examples include bucket stackers, circular stackers, and longitudinal stackers; redial reclaimers, bridge reclaimers, and portal reclaimers; and combination or multi-purpose products. Longitudinal stackers are designed for stockyards that have a corresponding shape. They are equipped with a traveling and luffing or luffing-and-slewing mechanism. Typically, longitudinal stacking systems are fed by a belt conveyor from a tripper car. These stackers, like other types of stacking products, are equipped with various counterweight arrangements. Hydraulic drive units or winches are used to drive the luffing mechanism.
Stacking methods for these stackers and reclaimers include chevron, cone, and strata. Bridge reclaimers are used to homogenize or blend bulk materials such as limestone. These stackers and reclaimers are equipped with heavy-duty scraper chains and can process parallel beds. Bridge reclaimers discharge bulk materials onto conveyors via concrete ramps or drag troughs. Located at the discharge end of the scraper chain, the inclined drag trough travels with the bridge reclaimer while loading the conveyor with material. Some such stackers and reclaimers have a full-facing harrow that covers the pile’s cross-section. This feature ensures proper blending and a homogenous flow of materials onto the belt conveyor. Larger harrows require fewer strokes and produce less wear on the reclaiming machine.
Stackers and reclaimers include portal and semi-portal scraper reclaimers, multi-purpose portal bridge reclaimers, combination stacker and scraper reclaimers, cantilever scraper reclaimers, and stacking and reclaiming equipment for circular stockyards. Slewing stackers are also available. Typically, these machines receive material from a fixed-belt conveyor and deposit piles using the cone shell method. Reclaimed material is directed into a discharge chute that leads to the reclaiming conveyor. Specialized stackers and reclaimers for both circular and longitudinal stockyards are also available.