Grinding in Ball Mills: Modeling and Process Control
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
Grate Discharge Advantage & Benefits
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 …
GRATE DISCHARGE BALL MILL
The grate discharge ball mill is also called grate ball mill. It is often used in the first stage of two-stage grinding to dry or wet grind various ores and other grindable materials. Compared with overflow ball mill, grate ball mill is a type of ball mill grinder that can realize forced ore discharging by grid lining plate and fan-shaped ...
(PDF) Slurry flow in mills: Grate-only discharge
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...
Overflow Versus Grate Discharge Ball Mills: An Experimental
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 transport of …
SAG Mill Grinding Circuit Design
For circuits classifying mill discharge at a coarse size (coarser than approximately 10 mm), trommels can also be considered to classify mill discharge. ... Design changes to date have, predictably, mostly concentrated on improving liner life and minimising discharge grate damage. Four discharge grates with thickened ends have …
Slurry flow in mills: grate-pulp lifter discharge systems (Part 2)
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.
Grate Discharge Advantage & Benefits
In simple words, grate discharge mills give higher tonnage, but produce coarser grinding, that may cause problem in your Flotation recovery, Grate discharge will also reduce your EGL. The best option would be to place a retainer ring at discharge end to hold more charge & that will give you more throughputs without compromising grind size.
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the discharge configuration: trunnion overflow mills operated in open or closed circuits or grate discharge mills [2]. On the one hand, the grate discharge mill, as the name implies, is fitted with a discharge diaphragm or grates between the cylindrical shell of the mill and the discharge
An efficient pulp lifter for ag/sag mills
The ideal slurry flow in a typical grate discharge mill is schematically shown in Fig. 1. The geometry of conventional pulp lifters is such that the slurry, once passed through the grate into pulp lifter will always be in contact with the grate until it is completely discharged, which makes the 'flow-back' process inevitable (Latchireddi ...
Peripheral Discharge Ball Mills -Theory and Practice
The peripheral-discharge mill differs from a trunnion discharge mill, ... In such cases it is advisable to depend on an external classifier and operate the mill in closed circuit; the grate bars should be set with at least 1/8-in. opening. Where a coarse product is desired, for example for concentrating table work, the grate may be used as a ...
The effect of grate design on the behaviour of grate-discharge …
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 …
Overflow Ball Mill with Good Price | Overflow Type Ball Mill …
Unlike the grate ball mill, the overflow type ball mill has a simple structure, and the discharge method is based on the gravity flow of the slurry to discharge the ore. The product size of the overflow discharge ball mill is generally less than 0.2mm, which is suitable for concentrate re-grinding operation and can be used as one-stage grinding ...
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. Compartment type
Vortex Discharge End
The Bradken Vortex® Discharge System: Provides superior discharge performance for SAG and AG mills. Is ideally suited to high throughput, high solids discharge mills. Increases ore throughputs. Increases pulp lifter wear life. Our one-piece Super Vortex® Grates cover the full depth of the charge to maximize grate open area and mill …
Slurry flow in mills: grate-pulp lifter discharge …
Although the function of the pulp lifters is simply to transport the slurry passed through the discharge grate into the discharge trunnion, their performance depends on …
Intro to Size Reduction
production as much as 300-400% over gravity discharge mills when grinding light materials to a fine particle size. 2. Without air, dusty material will take the path of least resistance, ... down to a size just slightly smaller than the screen or bar grate used. The force factor But screen size only accounts for only about 70% of what determines the
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 …
Ball Mill
According to the discharge type: overflow ball mill, grate discharge ball mill; According to the grinding conditions: wet milling, dry grinding; According to the ball mill media. The Applicable Materials of Different Ball Mills. Wet Grinding: Gold, chrome, tin, coltan, tantalite, silica sand, lead, pebble, and the like mining application.
A Review of the Grinding Media in Ball Mills for Mineral …
In a grate discharge mill, the impact is a major player in the media consumption, followed by abrasion and corro-sion, which are considerably lower because there is limited slurry pooling. However, in overflow mills, the wear mechanisms are mostly dominated by abrasion and corrosion,
Grinding in Ball Mills: Modeling and Process Control
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 is lined with mill liners protecting the steel body of the mill and incorporating mill lifters which help to raise the content of the mill to greater heights before it drops
Overflow VS Grate Discharge Ball or Mill
The above tables list some of the most common Grate Discharge Ball Mill sizes. Capacities are based on medium hard ore with mill operating in closed circuit under wet grinding conditions at speeds indicated. For dry grinding, speeds are reduced and capacities drop between 30% to 50% .
(PDF) Slurry flow in mills: Grate-only discharge
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 ...
Grate discharge ball mill | Henan Deya Machinery Co., Ltd.
The following figure shows the assembly drawing of 2700x3600mm grate ball mill produced by Henan Deya Machinery Co., Ltd. 2700x3600mm grate ball mill. 1.Drum 2. Flange 4. Screw 5. Manhole 7. Quill shaft end cover 8. Combination drum-scoop feeder 9. End cover liner 10.
An efficient pulp lifter for ag/sag mills
The degree of slow- tant component of grate discharge mills (GDM). The back depends on the size and design of the pulp lifters. GDM include autogenous (ag), semiautogenous (sag) The ideal slurry flow in a typical …
The effect of grate design on the behaviour of grate …
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 …
Grinding Mills
The types of mill normally encountered can further be classified according to the method of feeding the raw material to, and the removal of the final product from the mill. These classes are: 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 ...
The Selection Design and Application of Mill Liners for …
Produced for more than 50 years, effective materials for crushing and. grinding in industry. Consists of martensite matrix, with nickel alloyed at 3-5% in order to. suppress transformation of austenite to pearlite. Chromium usually included between 1.4-4% to ensure carbon phase.
Overflow Versus Grate Discharge Ball Mills: An Experimental
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 transport of material through the mill, which is being accomplished in overflow mills by …
AMIT 135: Lesson 6 Grinding Circuit – Mining Mill …
Rod mill diagrams of overflow and grate discharge [image: (135-6-8)] Overflow. Wet only; Robust and simple; Finer grind (longer retention time) High risk for over grinding; Ball charge 35-45%; Discharge. Discharge end more complicated; Coarser …
Advanced comminution modelling: Part 2
Coupling of SPH and DEM for prediction of multiphase flow in mills was introduced as a one-way coupling in [35]. The coupled DEM+SPH has been used for the prediction of the slurry flow within a SAG mill grinding chamber, flow through the grate and discharge flow along the pulp lifters [36,37].
A laboratory study of the performance characteristics of mill pulp
The cross-section of a typical low level grate discharge mill (A) with pulp lifters positioned between the grate and the discharge trunnion as well as their general arrangement (B) is shown in Figure 1. There are two main types of pulp lifter currently in use radial, and spiral. 1233 1234 s.R. Latchireddi and S. Morrell Though it has been ...
How a Grate Discharge Ball Mill Works
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 …
Small 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. All these mills are standard with white iron bar ...
IMPROVING ENERGY EFFICIENCY VIA OPTIMIZED CHARGE MOTION …
FlowMod calculates the slurry flow through the grate and pulp lifters. Based on this data the two models were fine-tuned to fit the Cortez SAG will. ... (SAG) throughout the United States. Depending on the mill size the SAG mills draws between 2 MW and 17 MW. The product from the SAG mill is further reduced in size using pebble crushers and ...
Effects of filling degree and viscosity of slurry on mill load
Furthermore, the mill operated with 8–10% less power as compared to the grate discharge scenario. But, regardless of the discharge system, in-mill slurry rheology and load behaviour remain the main determinants of the mill performance. Moys (1987), for instance, investigated how slurry rheology and flowrate shape the mill load.
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