Grinding in Ball Mills: Modeling and Process Control

or double helical scoop feeder. Several types of ball mills are distinguished depending on the discharge system and these types are commonly known as overflow discharge mill, diaphragm or grate discharge mill and centre-periphery discharge mill, e.g. see [23]. In industrial applications, the inner surface of the mill

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Grate-discharge Type The grate-discharge type of Ball Mill has a grate at the outlet of the shell and causes less excessive grinding, compared to the overflow type. Therefore, generally, it is best suited to grind materials up to the particle sizes ranging from 60 to 100 mesh. Compartment type

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Ball mills are also classified by the nature of the discharge. They may be simple trunnion over-flow mills, operated in open or closed circuit, or grate discharge (low-level discharge) mills. The latter type is fitted with discharge grates between the cylindrical mill body and the discharge trunnion.

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How a Grate Discharge Ball Mill Works. View Larger Image; Here I try to explain how ground slurry is discharged from a grate ball mill (or SAG). How it works is, the slurry ... A grate discharge mill that is "ground-out" would show the desired near zero blinding.

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The overflow type of Ball Mill is designed to overflow and discharge materials from ... in closed circuit or for special applications such as re grinding in open circuit. ... The grate discharge type of Ball Mill has a grate at the outlet of the shell and... Get Price How a Grate Discharge Ball Mill …

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a grate discharge ball mill (sometimes known as a "diaphragm discharge mill") incorporates a slotted discharge diaphragm with lifters at the discharge end of the mill. The diaphragm, or "grate", serves to retain the balls and any coarse material, with finished product passing through. Air Swept Ball Mill

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Grate discharge ball mill products are most popular in Africa, South America, and South Asia. Grate Discharge For Ball Mill Crusher Mills, Cone . Grate Ball Mill,Grate Ball Mills,Grate Ball Mill Manufacturer Grate Ball Mill could isolate rough material from fine in primary stage efficiently. It is an important process to control the granularity.

Slurry flow in mills: grate-only discharge mechanism (Part-1)

Discharge grates play an important role in determining the performance of autogenous, semi-autogenous and grate discharge ball mills. The flow capacity (grinding capacity) of these mills is strongly influenced by the discharge grate design––open area and position of apertures, as well as the performance of the pulp lifters.

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Introduction of grate discharge ball mill: Ball mill is an efficient tool for grinding various kinds of materials into fine powder. They are generally used to grind material which is 1/4 inch or smaller, down to a particle size of 20 to 75 microns.

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3.Grate discharge ball mill application:. Ball mill is generally used to grind material 1/4 inch and finer, down to the particle size of 20 to 75 microns. To achieve a reasonable efficiency with ball mills, they must be operated in a closed system, with oversize material continuously being recirculated back into the mill to be reduced.

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The cost of a ball mill conversion from overflow to grate discharge is 'fairly' affordable at $65,000 for a 13′ x 15′ mill. This is only for the discharge head, grates and pulp filters (rubber).

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Grate discharge Dry Grate discharge Wet Overflow discharge Wet Figure 8.5 Effect of mill filling on power draft for ball mills. The data is taken from Rexnord Process Machinery Reference Manual, Rexnord Process Machinery Division, Milwaukee, 1976 The effect of varying mill speed on the power drawn by the mill is shown graphically in Figure 8.4

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the ball mill to a grate-discharge unit to draw full motor power. ... Ball mill discharge slurry gravitates to the feed of the SAG mill discharge ..... ball work index of the ore is know to vary from 18.3 to 20.7 kWh/t and contributes to some of the. More details » Get Price.

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The ball mill is used to grind many kinds of mine and other materials, or to select the mine. 4.Grate discharge ball mill features: 1) Ball mill an efficient tool for grinding many materials into fine powder.

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A grate assembly at the discharge en d of the mill permits retention of a higher ball charge (up to 50%) than is possible in an overflow mill which has a practical limit of around 40%. Behind the grates is a lifting compartment which picks up the ground material as it passes through the grates and transports it out of the mill.

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