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Ball mill is the vital equipment for recrushing after being crushed.
Applied material:cement, silicate, new-type building material, refractory material, fertilizer, ore dressing of ferrous metal and non-ferrous metal, glass ceramics, etc.
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What is a high weir classifier? - The overflow weir (the slurry level) is higher than the spiral axis of rotation, but lower than the upper edge of the spiral at the overflow end. People usually call it a high weir
The characteristics of the high weir classifier: the area of the settlement zone is relatively low, and the height of the weir, that is, the height of the slurry level, can be adjusted within a certain range, that is, the area of the settlement zone can be adjusted and changed within a certain range to achieve control For grading the particle size of ore, the high weir classifier is a commonly used equipment in the grinding cycle stage of the beneficiation process, and is usually used for coarse classification sand reverse operation behind the first stage of grinding equipment
The advantages of the submerged grading concentrator: the settlement area is larger and the grading pool is deeper. The stirring of the spiral blades during the operation of the grading machine has little effect on the slurry surface, so the slurry surface is stable and the overflow flow is large during the classification. It is also fine, and is often used in fine grinding equipment or subdivision operations behind the secondary mill in beneficiation
Prominer has been devoted to mineral processing industry for decades and specializes in mineral upgrading and deep processing. With expertise in the fields of mineral project development, mining, test study, engineering, technological processing
It is not allowed to have the shrinkage cavity, shrinking porosity, gas porosity, inclusion, and other cavity defects on the section including plane pasting through the pouring gate and the ball centre
The chemical composition of the high chromium type product should conform to the below table. We can also manufacture the product with special chemical composition in accordance with the requirements of the customers
The environment in primary ball milling can best be described by giving equal considerations to both impact and abrasive conditions. The relatively large ball sizes employed [3″ – 4″ (75 – 100 mm)] contribute a significant impact component to the overall wear. The number of impacts in primary ball mills are far more frequent but have less magnitude than those experienced in SAG mills. The increased frequency is due to the Increase in charge volume (35 – 40% versus 5 – 10%), higher mill speeds, and the larger number of balls per unit charge weight. The lower impact forces are due to a combination of both smaller ball masses and lower drop heights resulting from the use of smaller balls and smaller mill diameters, respectively
The feed ore in primary grinding mills is typically very abrasive owing to its particle size, shape, and mineralogy. Wear speeds approaching or exceeding 20 µm/hr. have been measured for very abrasive Au. Cu, and Mo ores, while wear speeds on the order of 10-15 µm/hr. have been encountered in softer primary ores
Steel grinding media used in primary grinding must be designed for maximum abrasive wear resistance while maintaining good toughness. Toughness is particularly important in grate discharge mills where pulp levels at the discharge end of the mill can approach zero. Moroz and Lorenzetti (1981) found that maximum abrasion resistance is achieved by the combination of alloying with maximum amounts of carbon and heat treating the balls to their optimal microstructure
High Cr media for primary grinding will typically contain maximum levels of eutectic carbide (30 – 35% by volume) and are heat treated to their maximum hardness (HRC 65 – 68). However, not many high Cr balls are used in primary grinding because the improvement obtained in wear resistance relative to steel, typically 25 – 30%, is not enough to offset Its higher cost
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The gold ore grinding ball mill is the most widely used equipment in industyr grinding, the grid type ball mill and overflow ball millis used in the mineral processing industry and other industrial sectors .Dry type grid type ball mill is mainly used for industrial milling, mainly used for grinding materials industries
The ball mill is usually composed of cylinder, liner, feeder, hollow shaft, bearing, transmission device and lubrication system. The structure of the ball mill is introduced with the example of the 3200x5400mm overflow ball mill below
The cylinder is welded by a number of thick 30-32mm steel plates, with flange plates welded at both ends so as to connect to the casting end covers. The cylinder is equipped with a replacement liner. In order to make the liner contact tightly with the cylinder and buffer the impact of the steel ball on the cylinder, plywood is applied between the liner and the inner wall of the cylinder. In order to facilitate the replacement of the lining and the internal condition of the cylinder, a manhole is opened on the cylinder body. The manhole is mostly rectangular, and the length is generally 350-550mm.
The feeding part is composed of an end cover with a hollow shaft neck, a joint feeder , a fan-shaped liner and a shaft neck inner sleeve , etc. The inner neck of the hollow shaft can prevent the wearing of the inner surface of the axle neck. The inner surface of the inner sleeve is spiral and helps to feed. The feeder is bolted to the end of the inner sleeve. The general use of the joint feeder, followed by the drum feeder and worm feeder, and so on
The discharging part is made up o the end cover of the hollow neck, the wedge , the center liner and the inner sleeve of the axle neck, and radial bars are placed on the inner wall of the end cover, which is equivalent to the partition board. There is a latticed plate between each of the two bars and is pressed and fixed with a wedge. Wedge iron by the screw through the wall on the fastening ribs on the end cover. The center part uses the center liner to hold all the grid liners. The inner sleeve of the hollow shaft neck is made of a trumpet shaped blade at one end of the discharge grid to guide the pulp naughty from the partition board to flow down the blade. The whole discharge section is firmly fixed on the flange plate of the barrel as well as the feeding part.
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