Selection of equipment and construction features must be balanced with available finances and a minimum sacrifice in operating efficiency. Maximum metallurgical results with low operating and maintenance costs requires thorough study and sound planning. The correct design of a milling plant can mean its success or failure when in operation, the difference between profit and loss. The results obtained are proven by owner satisfaction. Ore tests and direct planning resulted in reduced initial plant construction and operating costs. A tailings thickener permits partial reclaiming of water, in dry seasons. The flotation machine launders were designed to permit changes in cleaning stages without shut-downs or prolonged delays, and permits circuit adaptation to changes in ore characteristics. An operating platform of wood was installed between flotation machines to give clear working space. The flotation machines are mounted on low piers to allow for drainage. The machinery foundations, building foundations, retaining walls and floors are concrete. The machinery selected and installed permits duplication of units for expansion.Īs field welding was not available, bolted steel ore bins were installed. Due to class of labor available, complicated controls and adjustments were eliminated where possible. The mill was planned to minimize the amount of excavation, reduce the height of retaining walls and amount of climbing by mill operators.Įquipment selected gives simplicity and flexibility in operation and allows for changes in tonnages and character of ore. The topography makes gravity flow through the mill possible and allows for delivery of ore direct from mine cars to mill. The mill site near the mine is accessible to water, power, labor and supplies, and includes adequate space for expansion and tailings disposal. Filters are directly above concentrate storage bins. The final ground concentrates are thickened and filtered. The flotation concentrates are pumped to a regrind circuit to produce desired final size meeting specifications. Each flotation section provides six cells for roughing and three cleaning stages with provisions for elimination of one or more stages for cleaning when the type of ore permits (flexibility incorporated in “Sub-A” Machines). The grind, - 65 mesh is held as coarse as possible to reduce grinding costs and still attain maximum recovery. Each classifier discharge flows by gravity to two banks of 6 Cell No. The screened fraction drops to a reversible conveyor, thence to fine ore bins.Īdjustable stroke belt ore feeders regulate the feed to two 5′ x 10′ Steel Head, Ball Mills, in a closed circuit with Cross-flow Classifiers. Crushed material is conveyed to a screen and the oversize is returned to the secondary cone crusher. Two-stage closed circuit crushing (with an apron feeder for control to the jaw crusher), provides -½” ore for grinding circuit. The flowsheet provides for the unit arrangement of equipment and for added flexibility. The flowsheet was based on laboratory tests wherein troublesome factors were eliminated ahead of design and construction. The design provided for simplicity of construction and final operation, and full usage of construction items available. The sulphur mill was designed for best adaptation to the mill site available. Basic Consideration Is Continuous Operationĭesign Study for 400-Ton per Day Flotation Plant.Grinding-Two Stage Rod and Ball Milling.Design Study for 500-Ton/Day Flotation Mill.Design Study for 400-Ton per Day Flotation Plant.When blowout takes place,blowout in drill string will be avoided because nozzle is closed automatically by valve cap for float valve assembly. The main application is,when connect with single piece pipe, to prevent mud coming in, mud up returning and blocking hole. The float valve sub is connected at upper part of drill bit, the float valve assembly in sub is near the bit connecting thread and the float valve sub also can be necessary position of drill string. Float Valve Sub is an important tool in petroleum exploration and drilling engineering.
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