AG/SAG mills, circuit design, plant performance, optimization INTRODUCTION AG or SAG mills have been in use in comminution circuits since the 1950's and are considered a mature technology in most countries. However, a reasonable number of recent SAG mill based projects

Grinding ball fragments discharging from SAG mills and ball mills cause extreme wear to downstream processing equipment. These ball fragments, circulating in a milling circuit, will cause excessive wear to sumps, pumps, hydrocyclones and interconnecting piping.

Page 769 MINING AND MINERAL PROCESS ENGINEERING, UBC - Vancouver, 6. C. Canada AG AND SAG MILL CIRCUIT SELECTION AND DESIGN BY SIMULATION Dr. S Morrell' and Dr. R D Morrison2

Grinding Circuit Modelling Documentation. This documentation describes the operating and underlying mathematics of the SAGMILLING grinding circuit modelling program. It is intended to be used by the model users who want to operate and understand the functioning of grinding models.

SAG Mill Circuit Example — Gold Processing SAG mill circuit example for gold processing [image: (135-6-3)] AG/SAG Mill. AG/SAG mills are normally used to grind run-off-mine ore or primary crusher product. Wet grinding in an AG/SAG mill is accomplished in a slurry of 50 to 80 percent solids. 2D and 3D simulations of particles in a SAG Mill

AG/SAG mill and crusher circuit simulations through the use of JKSimMet. Independent of this it can be used in power-based calculations, which in conjunction with the Bond ball work index test, enable the prediction of the specific energy of comminution circuits where such circuits include combinations of any of the following equipment:

PDF | On Sep 1, 2001, S. Strohmayr and others published SAG mill circuit optimisation at Ernest Henry Mining | Find, read and cite all the research you need on ResearchGate

circuit. The Kinross Paracatu new grinding circ uit consists of one 11.6 x 6.7m (38' x 22') SAG mill with. installed po wer of 20MW, followed by two 7.3 x 12.2m (24' x 40') ball mills with ...

SAG mills are also an optimum solution for wet grinding since crushing and screening in these cases can be difficult, if not impossible. Efficiency through automatic operation Outotec's process engineers will assist you in creating an efficient software-driven process, from circuit design to start-up and optimization, to ensure you get ...

The mills can be operated in open circuit, feeding downstream secondary grinding, or operated in closed circuit as single stage mills generating a finer product size. Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ...

SAG mill in closed circuit with hydro cyclones at Freda Rebecca Gold Mine would affect through put and specific energy consumption using an Excel based milling process simulator developed by Hinde, a comminution specialist who has worked for Mintek for …

A single SAG mill/ball mill circuit based on the FDW mill sizing was . selected. This sizing used a ball mill work index of 10.0 kWh/t based on . the 1992 testwork. The further grinding testwork ...

into AG/SAG mill circuits to break the critical size particles that accumulate in the mill and to increase the performance of the primary grinding circuits. Many studies have been carried out, mainly focusing on optimizing of SAG mills and cone crushers, respectively, but only a few have investigated the dynamic interactions between a ...

The mills can be operated in open circuit, feeding downstream secondary grinding, or operated in closed circuit as single stage mills generating a finer product size. Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged …

Next step is to add mills to the circuit: Create a new SAG mill by clicking the "+ primary mill" button. Further instructions. Continue adding mills (and pebble crushers) to the new circuit. The mills assigned to this new circuit are listed and can be edited (if necessary) by clicking the looking glass icons. Choosing the right model

Semiautogenous-single stage. These circuits are not a good choice for many orebodies because it is not logical to expect one machine to be as efficient on 150 mm …

Where the SAG mill/ball mill circuit is the bottleneck in the processing plant the pebble circuit can be a significant factor in limiting overall plant capacity. The pebble circuit recirculating load can be very significant (depending on the ore characteristics and …

Further, the SAG mill circuit was characterized by fluctuating feed size of between x. F, 80 =102 to 185 mm. A need for control of the feed size as well as blending ratios was recommended for an efficient operation in terms of throughput and final product size. This could be …

showed that a single line 42' SAG mill circuit gives the most favorable project economics. Therefore, utilizing our industry-leading large mill design with our extensive manufacturing expertise, Outotec delivered the world's largest SAG mill. Once again, we have set the bar for large grinding mills, all whilst maintaining our renowned

crushing circuit where companies have observed damage to crushers, unscheduled downtime and loss of production. The other is the grinding circuit where companies have discovered wear to pumps, sumps, piping, hydrocyclones, mill liners as well as inefficient grinding, power consumption and optimization of mill throughout overall.

This circuit shows a semi-autogenous grinding (SAG)/ball mill circuit where both grinding mills are in closed circuit, with the SAG mill closed with a crusher to control the …

SAG Mill Grinding Circuit Design . 2016 6 6&ensp·&enspCommon convention generally refers to high aspect ratio mills as SAG mills with diameter to effective grinding length ratios of …

MODEL PREDICTIVE CONTROL OF SAG MILLS AND FLOTATION CIRCUITS *Michael G. Forbes and Bill Gough . ANDRITZ AUTOMATION Ltd. 100 – 13700 International Place Richmond, BC V6V 2X8 Canada (*Corresponding author: mike.forbes@andritz) ABSTRACT . Precise control of SAG mill loading and flotation cell level is critical to maximize production and

The grinding circuit comprises of two mills. The 5.5m diameter x 8.2m EGL ANI SAG mill is low aspect with a 3,850 kilowatt motor. The SAG mill normally operates in open circuit, but has the capability to be operated in closed circuit SAG only configuration. The 4.3m diameter x 6.7m EGL ball mill fitted with a 2,20 0kw motor operates in ...

crushed ore is fed into a SAG/Ball mill circuit with a median size of approximately 12,000 microns. Most SAG Mills are operated in closed circuit with a screen. The screen fi lters undersized ore, normally minus ½ inch, to a ball mill discharge sump. The combined mill discharg-es are pumped to undergo classifi cation, normally via hydrocyclones.

Sagmilling is home to a collection of both free and subscription-based calculation tools to aid metallurgical process engineers perform comminution calculations. Grinding circuit design tools, including for SAG mill-ball mill circuits, and geometallurgy energy …

single-stage mill is finished material suitable for flotation or leaching, usually in the size range of 80% passing 200 µm to 100 µm. The design of such circuits is complicated by the typical power-based models used for conceptual design being calibrated to a two-stage circuit with AG or …

The circuit comprises a SAG mill, 12 m diameter by 6.1 m length (belly inside liners, the effective grinding volume), two pebble crushers, and two ball mills in parallel closed with cyclones. The SAG mill is fitted with a 20 MW gearless drive motor with bi-directional rotational capacity. (Reversing direction evens out wear on liners with ...

SAG Mill Circuit Sampling. Many mills have been built based on data from inadequate sampling or from insufficient tests. With the cost of many mills exceeding …

(MPC) is described for a SAG mill circuit in a bauxite processing refinery at Wagerup, Australia (Refs: Gopinath, Mathur et al, 1995 and Le Page, Freeman et al 1996, Luse, Mathur et al 1997). The MPC controller presented in this paper is perhaps the first successful implementation of MPC for ball mills described in the literature.

2006). The laboratory bench-scale SAG mill reproduces operating conditions of a commercial SAG mill, in a closed circuit dry grinding environment. The ground product for the laboratory SAG mill is then submitted to the Bond ball mill work index test. The number of SAG mill revolutions required to grind the material to a P