A SAG Mill trommel screen lets you control the true discharge size of your SAG mill or the transfer size to the downstream Ball Mill circuit. ... In the image case below, strangely enough, is the mill shell liner and discharge grate manufacturer. The grates it provides to this Cu/Pb/Zn operation are 15mm X 30mm. ... This trommel …
Because SAG mills rely both on the ore itself as grinding media (to varying degrees) and on ore-dependent unit power requirements for milling to the transfer size, …
Liner design needs to respond to the process aspects of mill liner action that are critical to good SAG mill performance, i.e., the impact of shell liners on the grinding …
Typically the SAG mill will be 10 to 15% larger (more power) than an average ore design. Other design points recently used are: hardest ore (100th percentile), 75th percentile, …
The following article presents the development of a dynamic tool for the estimation of Jb/Jc rate (ball filling level/total load filling level) of a SAG mil operating in a single stage mode....
The discrete element method is used to carry out the simulation, under the hypothesis that the restitution coefficient can substitute for the presence of the fluid inside the mill, and that by changing the angle of inclination of the grate slots the performance can improve the classification that they make and in the total discharge flow.
I,, I I 10 12 14 16 18 20 22 24 Net mill hold-up (% vol) Fig.13a Performance of pulp lifters at a given mill hold-up Performance characteristics of mill pulp lifters 1243 25 &S is TEST CONDITIONS PL Size : 6.8% C.Speed : 70% ] O.Area : 10% I Grate-only 10 12 14 16 18 20 22 24 Net mill hold-up (% vol) Fig.13b Influence of pulp lifter ...
Download scientific diagram | Grate slot size variation from publication: Development of a dynamic Jb/Jc estimation model in a single stage SAG mill | The following article presents the ...
Similar to slurry flow-back, the pebbles flowing back into the mill increase with larger pebble port or grate slot size. As the pebbles flow down and slide across the grate slots, they get an equal chance to go back into the mill. Similar to slurry pool formation, pebbles flow-back would increase the quantity of critical size material in the mill.
> Engineering approaches have highlighted mill performance with mill modelling and the use of improved materials > Liner design,with the advent of large diameter SAG mills, the issues of design, selection, monitoring and evaluation of mill performance is critical > Mill trajectory modelling can be used to great effect in improving liner design
All autogenous (AG) and semi-autogenous (SAG) mills use steel or rubber grates to hold back the grinding media, whilst allowing the product slurry to flow through and out of the mill. The total open area, size, shape and position of the holes varies considerably from installation to installation (Napier-Munn et al., 1996), as given in Table 1.
Nowadays computer simulations have been shown to be powerful tools to understand the performance of systems where we have mathematical models that can capture the physics of the problem. In this paper we attempt to simulate the behavior of the particles that move inside a large- scale mine mill, specifically through the grates and the discharge ducts …
The finding in this research is to reveal the condition in which a reliable DEM solution is achievable in the appli-cation of a SAG mill. The DEM result sheds insight to the design of the grates like the size and total opening area of the slots. It also provides structural optimization on a new type of grate used in a SAG mill.
Allow me to compare: Ball mills can be of the overflow or of the grate discharge type. Overflow discharge mills are used when a product with high specific surface is wanted, without any respect to the particle size distribution curve. Overflow discharge mills give a final product in an open circuit. Grate discharge mills are used …
These are ideal for high throughputs and a coarse product to feed to a secondary ball mill for further size reduction. Medium aspect mills are common in Australia, with aspect ratios between 1.2 and 1.5. ... To …
operation of SAG mills. SAG mills are currently the technology of choice in hard rock milling operations for reducing primary-crushed ore to ball mill feed. In recent years, the trend has been towards larger-sized SAG mills with diameters of 10.4 m (34 ft) and above, with the largest being 12.2 m (40 ft) in
Section snippets Experimental set-up. The mill used for the testwork program was 1 m in diameter and 0.5 m long. Power was delivered from a 18.5 kW motor via a variable speed gearbox which provided a speed range of 7–42 rpm.
In this case, by testing new SAG mill liner designs in order to improve throughput, reduce pebble load and optimize reline times. ... / Grate Slot Size Reduction. Grate Slot Size Reduction. United States. ME FIT Grinding. Efficiency. Availability. Processing. SAG Mill. Full case in PDF.
Similar to slurry flow-back, the pebbles flowing back into the mill increase with larger pebble port or grate slot size. As the pebbles flow down and slide across the …
A practical approach has been developed for the design of both grates and pulp lifters. It is based on: an appreciation of the process interaction between grates and pulp lifters, an interpretation of mill charge structure as it relates to discharge through grates, and an analysis of pulp and solids flow in pulp lifter channels. This approach can be used to …
application of the DOE method has allowed to back up statistically the results and indicate that the slot angle increases the mill's outlet flow. Keywords: grate, SAG-Mill, DEM-Simulation, flow-back, carry-over 1. Introduction Size reduction of ores has an important role in the process of obtaining various metals. For example, for
The semi-autogenous mill is also called SAG mill which is an acronym for semi-autogenous grinding. It is similar to an autogenous mill but uses grinding media like a ball mill grinder. It takes material itself as the main grinding media and grinds through their mutual collision.
When the SAG mill feed size dropped to around 80% passing 80mm, recycle pebble rates approaching the design level were achieved even with new grates installed and SAG mill …
Yanacocha Gold Single Stage SAG Mill Design, Operation and Optimisation ... size r ange and the in abilit y to achieve a finer grin d size ha s occasiona ... four diff erent shap e grate slot s ...
In this case, by testing new SAG mill liner designs in order to improve throughput, reduce pebble load and optimize reline times. ME Elecmetal's integral approach to mining is committed to add value into processes …
Nowadays computer simulations have been shown to be powerful tools to understand the performance of systems where we have mathematical models that can capture the physics of the problem. In this paper we attempt to simulate the behavior of the particles that move inside a largescale mine mill, specifically through the grates and the discharge ducts of …
a 1 meter diameter pilot sag mill. Keywords Autogenous, Semi-autogenous, Grate, Pulp lifters, Hold-up. 2 . ... pulp lifters is perhaps more important than grate slot area for successful mill operation. A decade later both Bond (1985) and Kjos (1985) reiterated the importance of pulp lifter ... • The performance of the pulp lifter improves ...
The critical size pebbles, taken out of the mill through openings in the discharge grate, are crushed and recycled to the circuit. Ultrafines production and power consumption decrease while power drawn by the mill remains constant.
Wet autogenous mills can have their grates fitted with slots of suitable size making it possible to set, as desired, the top size of the product discharged from the mill. Basic Plant Flowsheet One major characteristic of primary autogenous concentrators is the relative simplicity of their overall plant flowsheet.
Semantic Scholar extracted view of "Slurry flow in mills: grate-only discharge mechanism (Part-1)" by S. Latchireddi et al. ... techniques were used to investigate the breakage of a typical South African platinum group minerals ore in a ball mill to optimize product size distribution ... A Discrete Elements Method (DEM) study of load movement ...
• Grate: The size of the grate apertures and the pressure of the slurry as it enters the grate slot will control the flowrate out the grate. • Flowback: Once the slurry is carried past the profile of the charge, the slurry can flow from the pulp lifter chamber back through the grate holes into the mill.
A mill is a grinder used to grind and blend solid or hard materials into smaller pieces by means of shear, impact and compression methods. Grinding mill machine is an essential part of many industrial processes, there are mainly five types of mills to cover more than 90% materials size-reduction applications.
