Laserfiche WebLink
• Main haulage belts are 42" wide conveyor belts which may be either roof <br />or floor hung wire rope conveyors. EFCI currently has approximately 7,000 <br />feet of main haulage conveyor. <br />The main haulage conveyor discharges to the raw coal stockpile containing <br />approximately 4,500 tons. A reclaim conveyor, which is fed from a draw <br />point beneath the raw coal stockpile, transfers coal to the coal <br />preparation plant. <br />The raw coal product contains a significant amount of mineral matter both <br />from natural mineral inclusions and from partings which are recovered with <br />the coal seam during mining. In order to produce a quality, saleable coal <br />product, these materials must be removed. The raw coal reclaim belt feeds <br />the raw coal product to a rotary breaker. Because of differences in the <br />friability of coal and refuse materials, the coal is broken and passes <br />through the breaker to a return belt while coarse refuse discharges to a <br />• storage hopper. <br />From the raw coal reclaim conveyor, the feed is screened to separate <br />coarse and fine coal fractions. The coarse fractions are transferred to <br />heavy media separation tanks where the lighter coal float product is <br />separated from the denser mineral materials. The fine coal fractions go <br />to riffle tables and cyclone classifiers which achieve a physical <br />separation using differential settling, centrifugal force, and density <br />stratification. <br />From the heavy media tanks, coarse coal fractions go to centrifuges which <br />remove excess surface moisture then to the clean coal product belt. EFCI <br />has a screen on the clean coal product belt which can be utilized as <br />required to obtain a stoker coal product. When this screen is utilized, <br />the stoker product is diverted to a separate stoker coal stockpile while <br />the remainder of the clean coal product is transferred to the clean coal <br />stockpile. The fine coal product, which contains a significant amount of <br />. moisture from procESSing, must also be centrifuged before being <br />transferred to the clean coal product belt. <br />2.05.3-13 <br />