grate discharge ball mill

overflow discharge mill, diaphragm or grate discharge mill and centre-periphery . ... Ball mills can grind a wide range of materials, including metals, ceramics, and polymers, and can operate on a ...

Here I try to explain how ground slurry is discharged from a grate ball mill (or SAG). How it works is, the slurry flows across the grate as it would a screen panel. On the other side of the grate/screens are veins like a pump impeller. As the mill turns/rotates the slurry is "pumped" out […]

The GDM include autogenous (ag), semiautogenous (sag) and grate discharge ball mills. The purpose of the pulp lifters is simply to transport the slurry passing through the grate holes into the discharge trunnion. …

The role of the pulp lifters is to lift the slurry which passes through the grate into the discharge trunnion. They are incorporated in both flat- and conical-ended mills (Fig. 1) and are normally either radial or spiral in design (Fig. 2). Of the above two designs, the radial or straight type is most commonly used in industry.

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.

A set of experimental test work has been carried out in a continuous pilot ball mill of 0.41m X 0.56 m (diameter X length) at different mill speeds, percent solids and discharge mechanism. The results of study on material flow through a grate discharge tumbling mill verses an overflow tumbling mill are presented to emphasize the effect of ...

Based on experience, mill-liner designs have moved toward more open-shell lifter spacing, increased pulp lifter volumetric capacity, and a grate design to facilitate maximizing both pebble-crushing circuit …

Due to the difference of ore discharge modes between the two mills, the productivity of grate ball mill is 10%–25% higher than that of overflow ball mill. When two-stage grinding is required, the first stage uses grate ball mill and the second stage uses overflow ball mill. When regrinding of coarse concentrate is required, overflow ball mill ...

In grate discharge mills the product is discharged primarily due to hydraulic gradient from the feed end to discharge end. Hence there is a possibility for much quicker …

It is better to select a grate discharge ball mill when the required discharge size is 0.2 ~ 0.3 mm. b. Overflow discharge ball mill. The overflow discharge ball mill is designed with no sieve plate so that the ore pulp can be discharged directly without filtration. It is very simple in structure and convenient for maintenance.

A mill of this configuration is not often seen. Well done NCP Team! Rare footage: Open ended grate discharge,slipper pad, ball mill. | A video of an open ended grate discharge,slipper pad, ball mill.

SMALL C. I. W. BALL MILL. The CIW is a Small Ball Mill that's belt driven, rigid bearing, wet grinding, trunnion or grate discharge type mill with friction clutch pulley and welded steel shell. The 7 and 8 foot diameter mills are of flange ring construction with cut gears while all other sizes have cast tooth gears.

The mill discharge flowrate Q (m 3 /h) for a grate discharge mill is equal to the product of the flowrate through the mill charge, Q m (m 3 /h), ... The primary cyclone underflow split to the ball mill, PC split, was considered as one of the parameters in the preceding discussion. It is also possible to construct an inferential model of the split.

For overflow ball mills, the charge should not exceed 45% of the mill volume . For grate discharge mills, the charge should occupy about 50% of the mill volume . Bond developed a relationship that can be used to determine the percent charge by volume as a function of the vertical height above the charge, He, and the radius of the mill, R, i.e.,

Abstract. 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 ...

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 …

Grate discharge ball mill or grate ball mill has grid plates and fan-shaped chambers inside the cylinder to realize a forced discharge. AGICO grid ball mills feature long …

By combining with SAG discharge and screening on the SAG discharge screens, top size control to the ball-mill circuit feed is maintained while still unloading the SAG circuit (Mosher et al, 2006). A variant of this method is to direct pebble-crushing circuit product to the ball-mill sump for secondary milling: while convenient, this has the ...

Summary and conclusions. The slurry transportation in AG/SAG mills is a two-stage process consisting of flow through the grate and the discharge of slurry by pulp lifters into the discharge trunnion. The grate-only discharge condition provides the ideal relation between slurry hold-up and flowrate.

An analysis of wet grinding operation using a linearized population balance model for a pilot scale grate-discharge ball mill. V. Gupta D. Hodouin M. D. Everell. Engineering. 1982; 11. Save. The influence of pulp composition and feed rate on hold-up weight and mean residence time of solids in grate-discharge ball mill grinding.

Peripheral Discharge Ball Mills. The several layers of balls lying on top of those next to the shell follow a similar cycle except that, due to relative difference in the two forces, their paths become more nearly vertical. The outer layers, spreading more than the inner layers, increase the area in the zone of the falling balls.

The grate ball mill uses a low-level forced ore discharge. The ore slurry stored in the mill is less, and the minerals with high density are not easy to concentrate …

The advantages of MQS Wet Grate Discharge Ball Mill：. Shunda MQS Wet Grate Discharge Ball Mill is about 70 days, but it is only for reference. Due to the impact of climate, the supply and demand of raw materials and other factors, there will be little changes in the specific production cycle, the details please get in touch with Shunda staff ...

Gupta et al. (1981, 1982) have reported data measured on various ores in a 0.4 m 0.4 m pilot grate- discharge ball mill. In the 1981 paper the hold-up ms (kg of solid) was cor- related with Fs (solids feedrate) and ws (% solids) using a linear model of the form: ms = hlFs + k2ws + k3 While this model fitted their data well, it is clearly not ...

Pulp lifters, also known, as pan lifters are an integral part of the majority of autogenous (AG), semi-autogenous (SAG) and grate discharge ball mills. The performance of the pulp lifters in conjunction with grate design determines the ultimate flow capacity of these mills. Although the function of the pulp lifters is simply to transport the slurry passed through …

Ball mills are usually either of the grate (diaphragm) or overflow type. Ball Mill Components. Ball mills consist of the following components: Inlet – crushed ore is fed to the ball mill through the inlet. A scoop ensures the feed to the mill is constant. Discharge – reduced feed exits the mill through the discharge. Ball Mill Components

How a Grate Discharge Ball Mill Works. Here I try to explain how ground slurry is discharged from a grate ball mill (or SAG). How it works is, the slurry flows …

The ball mill is a rotating cylindrical vessel with grinding media inside, which is responsible for breaking the ore particles. ... In a grate discharge mill, the impact is a …

Grate ball mill (Fig. 3), the discharge end of the mill is set with a grate. Peripheral discharge ball mill, and the products are discharged through the discharge port around the cylinder. According to the ratio of cylinder length (L) to diameter (D), the ball mill can be divided into short cylinder ball mill, L/D ≤ 1; long barrel ball mill ...

In grate ball mill work there are no discharge head liners. The discharge grates and grate assembly replace these parts. Mill LINER BOLTS. Where cast liners are used shell liner bolts and head liner bolts are made of forged steel with an oval head to prevent turning and loosening within the liners. These are held in place with two hex nuts …

Ball Mill. The proven classical option for cement grinding. Whether employed as a two-compartment separator mill in an independent grinding system, or in combination with a high pressure grinding roll, the Ball Mill is a robust and reliable alternative for cement and granulated blast furnace slag grinding. Used in combination with the sepol ...