The crushing of ore is a large ore. By means of the action of external force, it overcomes the internal intermolecular force and breaks, so that the size of the nugget is gradually reduced. In the ore dressing process, ore crushing is usually divided into two major stages: crushing ( coarse stage ) and grinding ( fine stage ) .
In the concentrator, the crushing of the ore is an indispensable material preparation stage before the sorting operation. First, most of the ore processed by the concentrator is closely associated with useful minerals and gangue minerals, and often in fine or even fine-grained inlays. Only by breaking them down and fully dissociating them can they be enriched by existing physical beneficiation methods. Second. All physical beneficiation methods are limited by particle size, and the particle size is too coarse (the useful mineral and the gangue are not dissociated ) or the fine particle size ( ie, the over-pulverized fine particles ) cannot be effectively sorted. In all aspects of the concentrator, ore crushing is the most expensive process and an important part of the investment and production costs of the concentrator. According to statistics, the investment in ore crushing process accounts for about 60 % of the investment of the ore dressing plant. The production cost accounts for 40 % -60% of the total cost of mineral processing, the electricity consumption accounts for 50 % -65 %, and the steel consumption accounts for more than 50 %. In summary, the basic task of the ore crushing operation is to provide suitable materials for the sorting operation. The crushing process works well and directly affects the technical and economic indicators of the beneficiation, so some people think. Ore crushing is the key to determining the success or failure of the beneficiation process. Therefore, each ore dressing worker should pay sufficient attention to the process equipment selection and production management of ore crushing operations. Single action double pump principle: Blade is embedded in the groove and can slide freely, when, produced by the rotation of blades to under the action of a centrifugal pump shell, vane pump is a positive displacement pump, the adjacent two blades movement to the bottom with the pump casing and rotor closed minimum volume, when it is the largest, when rotor clockwise, the adjacent two blades experience from the bottom to the top of the process is the volume increase, So oil absorption (from quadrant 4 to quadrant 2); From the top to the bottom is the volume reduction process, so the oil pressure (from the second to the fourth quadrant).
Double-acting double pump principle: when the motor drives the rotor along the rotation, the blade under the dual action of centrifugal force and pressure oil at the bottom of the blade extends outwardly, the top of which is close to the inner surface of the stator. The four blades on the four concentric arcs, the outer surface of the rotor, the inner surface of the stator and the two valve plates respectively form four sealed working oil cavities. The oil chamber with the rotation of the rotor, sealing oil chamber produced from small to large or from large to small changes, can be through the valve plate oil suction window (connected with the oil suction port) or oil discharge window (connected with the oil discharge port) the oil suction or pressure out. In the process of each rotation of the rotor, each working oil chamber to complete two oil suction and pressure, so called double-acting vane pump, because the high and low pressure chamber symmetrical symmetry, axial force balance, for unloading type.
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