process grate discharge ball mill

Converting of Lubambe Copper Mine Ball Mill from …

The Lubambe secondary mill was designed as a grate discharge type configuration. The ball mill discharge configurations and shell lifter bars have undergone significant …

Dry Grinding & Coke Grinding

A Open End, End Peripheral Discharge, CPD Rod Mills and Grate Discharge Ball Mills are particularly efficient for dry grinding. Such materials as limestone, cement clinker, gravel, phosphates, clays, gypsum, oil shale, terra cotta mixtures, coal and coke are economically reduced in size through their use. Many such applications …

Ball Mill & Rod Mill Design

In the chemical and process industries, grinding is an important step in preparing raw materials for subsequent treatment. In present day practice, ore is reduced to a size many times finer than can …

Side effects of converting Ball Mill from Grate to Overflow Discharge

We recently converted a grate discharge type ball mill (size 5.7X8.6m) to an Overflow type. Before conversion, the ball level was 26%, and we were able to obtain a grind of 90%+ passing 75mic at a throughput of 350t/h. After conversion it's a nightmare to obtain 90%+ passing 75mic at the same thro

types of ball mills

The ball mill's working process occurs within the cylinder. As the ball mill grinding media inside the cylinder reaches a certain height due to the cylinder's rotation, it falls under its self-weight, severely impacting the raw materials in the cylinder. ... The Overflow Discharge mill is suitable for fine grinding, the Diaphragm or Grate ...

Overflow VS Grate Discharge Ball or Mill

Grinding Mills

Batch mills. Grate discharge mills. Trunnion overflow mills. Air-swept mills. The principles of these mills are illustrated in Fig. 1.4 and Fig. 1.5. Batch Mill. As the name implies, in the batch mills, Fig. 1.4a, …

The effect of grate design on the behaviour of grate-discharge grinding

A model for the effect of flowrate and viscosity of slurry on the hold-up of slurry in a grate-discharge grinding mill has been developed. Given detailed specifications of the grate design (such as the area in the grate within which the holes are situated, the number of holes per m 2 and the hole size) and the flowrate and viscosity of the slurry …

How a Grate Discharge Ball Mill Works

This diaphragming action works the large particles that enter the grate through to discharge and produces a near zero blinding …

Grate Discharge Advantage & Benefits

As secondary ball mills are usually fed a relatively (compared to SAG mills) fine F80 and have high re-circulating loads and produce product fineness of the P80 - 100 to 160 …

The scale-up of grate-discharge continuous ball mills

The following investigation is concerned with the scale-up of grate-discharge continuous ball mills with mill length and feed rate being variables. EXPERIMENTAL The length of the continuous mills used in this study could be varied from 14.6 to 73.0 cm (5.75--28.75 inches) in steps of 14.6 cm.

Ball Mill

Ball Mill Working Principle High energy ball milling is a type of powder grinding mill used to grind ores and other materials to 25 mesh or extremely fine powders, mainly used in the mineral processing industry, both in open or closed circuits. Ball milling is a grinding method that reduces the product into a controlled final grind and a uniform size, usually, …

Grinding in Ball Mills: Modeling and Process Control

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 …

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.

The effect of grate design on the behaviour of grate-discharge …

The influence of pulp composition and feed rate on hold-up weight and mean residence time of solids in grate-discharge ball mill grinding. Int. J. Miner. Process., 8: 345--358. Gupta, V.K., Hodouin, D. and Everell, M.D., 1982. An analysis of wet grinding opera- tion using a linearized population balance model for a pilot scale grate-discharge ...

Grate Discharge Advantage & Benefits

This depends on your process. Please be aware that adding a grate to your ball mill will reduce your EGL by around 500 - 600mm (the depth of the pulp lifters and grate plate / liner thickness, plus it will also increase your mill motor power draw by anything from 10-20% for the same throughput.

Horizontal Grinding Mill Overflow Type, Grate-discharge …

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. ... Dry-process Crushing and Sizing Machine Granulator; Dryers, Calciners/Kilns. Indirect ...

Ball Grinding Process

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 ...

Converting of Lubambe Copper Mine Ball Mill from …

The Lubambe secondary mill was designed as a grate discharge type configuration. The ball mill discharge configurations and shell lifter bars have undergone significant modifications and changes to improve mill performance. The ball mill was initially fitted with rubber liners and discharge grate. The mill had a total number of twenty ...

Overflow Versus Grate Discharge Ball Mills: An Experimental

It has been widely accepted to go for grate discharge ball milling when a coarse product is preferred or to avoid production of extreme fines, but overflow discharge mills are …

Slurry flow in mills: grate-pulp lifter discharge systems (Part …

According to the pattern, the residence time thresholds beyond which overfilling a ball mill is likely to occur were defined. For a ball mill with an internal diameter smaller than 5.9 m, the volume-based residence time threshold is set at 2 min; and for a ball mill larger than 5.9 m in diameter, the threshold is set at 1 min. In addition to ...

Ball Mill (Ball Mills Explained)

The discharge port may be covered by a grate to prevent oversized ore exiting the mill, or it may have no grate (overflow type ball mill). As the balls wear due to abrasion, they are replaced with new balls ('green' …

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

Flow diagram of the ball mill grinding process.

The developed ACS can be used in the process control system for grinding in a ball mill with a grate to increase the productivity and stability of the technological process and reduce the energy ...

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

The influence of pulp composition and feed rate on hold-up weight and mean residence time of solids in a grate discharge ball mill grinding. Int. J. Miner. Process. (1981) M.H. Moys The effect of grate design on the behaviour of grate discharge mills ... Citic SMCC Process Technology Pty Ltd has developed such a model and in this paper …

Ball Grinding Process

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 ...

Converting a ball mill from overflow to grate …

Converting a ball mill from overflow to grate discharge involves installing a grate inside the mill at the discharge end. The grate holds the balls inside the mill but allows the slurry to pass through, and it …

Overflow vs. Grate Discharge Ball Mills: What's the …

On the other hand, grate discharge ball mills have a grate wall at the discharge end, which holds the larger particles while the fine slurry is allowed to pass through. Operational Efficiency The decision between an overflow or grate discharge ball mill can affect the efficiency of the grinding process.

Scats production in overflow ball mill

Thank you dear DAVID. The last stages of vibrating screening is 12 mm D80=de to 10 mm measured by exploitation team The ball mill size added: 2/3 is of 100mm and 75 mm 1/3 Actually the initial work index changed and we tried to calculate the operational work index according to a follow-up of the parameters below but I don't have any conclusions …

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® high-efficiency separator, …