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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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In recent years, the iron ore beneficiation equipment industry has been continuously improving with the competition of iron powder. The iron ore beneficiation equipment produced by our company is specialized in the enrichment and purification of raw iron ore. The raw iron ore has been processed and screened. Finally, relatively high-quality finished iron ore concentrates can be obtained. So how to improve the purity of iron ore concentrate in the production process of iron ore dressing equipment?
First of all, it is the key to improve the fineness of iron ore beneficiation equipment and high-fine ball mill grinding.Prominer Shanghai beneficiation equipment experts have learned from a large number of iron ore beneficiation production practices that within a certain range, the grinding fineness is only 1 higher per liter. The grade of finished iron ore concentrate can be increased by 0.08%
Then reducing the particle size of the mill during the iron beneficiation process is also the key to improving the grade of the iron ore concentrate. Under the premise that the properties of the ore have not changed significantly, the mill processing capacity of the concentrator has increased by 27%. In iron ore beneficiation operations, it is necessary to reduce the particle size of iron ore into grinding from 0-20 mm to 0-14 mm, achieving more crushing and less grinding, improving grinding efficiency, reducing production costs, and meeting the needs of customers in the beneficiation process. Item requirements
In the process of iron beneficiation, in order to improve the grade of iron concentrate, in addition to what we said above, it is necessary to rationally blend the ore. For iron ore concentrators, the source of the original iron ore is generally different. The properties are also quite different, and there are obvious differences in their grindability and selectability. In order to stabilize the ore feeding properties of the ball mill, we can make a strict ratio of the grinding volume of different raw iron ore according to the production volume. When different raw iron ore is not balanced, a buffer storage yard is set up to ensure the proportion of ore into the grinding
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
Our Laboratory Grinding Mill comes standard with a 1 HP motor and optional variable speed drive ranging from 1 to 100 RPM. This Grinding Mill is fully enclosed with sound dampening material for a quiet workplace. The sheet metal steel fabrication provides full enclosure around the main frame and door. The yoke (grinding cylinder) is totally balance and vibration-free in its horizontal position of operation. Minimal effort is needed to swing it from horizontal to vertical position (loading/unloading). A unique feature this grinding mill has is the possibility to use different cylinders for research or pilot plants tests. Specifically, we offer different size of cylinders from 5” (127mm) inside diameter by 12” (305mm) long to 9” (229mm) diameter by 22” (560mm) long. All grinding mill’s cylinders are fully interchangeable and can be mounted/ removed rapidly. The cover is of a unique design that automatically seals the cylinder and is quickly mounted/removed. Another feature of this Grinding Mill are its heavy duty castors (wheels) for ease of laboratory movement/mobility
Ore Grinding Mills are used for the fine grinding as the last step in the reduction of an ore prior to concentration (gravity or flotation) or cyanidation. Practice varies, depending upon the type of ore and the amount of reduction required. In addition, some of the older properties continue with methods that perhaps are not considered the best in light of recent improvements but that cannot be economically changed because of capital outlay. Present grinding practice is closely linked with classification, so that some overlapping of subject matter occurs. In this chapter some of the theory of grinding, different types of equipment, and flow sheets are discussed
Most of the tonnage milled today is ground in one of the following types of equipment or a combination of two or more: ball mills, tube mills, rod mills, and stamps. Chilean mills and Huntington mills are used only in a few isolated cases today
The term “ball mill’ is generally used to refer to a cylindrical mill whose length is less than, equal to, but not much greater than its diameter. It was initially developed for relatively coarse grinding, but by using it in closed circuit with a classifier its use has been extended for fine grinding
Ball mills have shells of cast iron or steel plates and are carried on hollow trunnions. Ore is fed through a scoop, drum-type, or combination feeder at one end and is discharged from the opposite trunnion
Ball mills may be arbitrarily classified into two types, according to the method of pulp discharge. In high-level or overflow mills the pulp level builds up until it overflows and discharges through the trunnion. High- level discharge mills are made by a large number of manufacturers throughout the world. Low-level mills are typified by the Allis-Chalmers and Marcy (see Figs. 14 and 15) grate-discharge mills. The discharge end is fitted with grates; between the grates and the end of the mill are radial lifters which act as a pump to lift the discharge to the hollow trunnion. Drive is by spur or herringbone gear, direct connected or belt driven
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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