The grinding process of the ball mill is an essential operation in metallurgical concentration plants. Generally, the model of the process is established as a multivariable system characterized with strong coupling and time delay. In previous research, a two-input-two-output model was applied to describe the system, in which some key indicators of the process were …

illustrate clustering concepts further data was collected from an operating expert control system from a typical SAG mill/Ball mill grinding plant for a 3-month period. Process variables extracted for cluster analysis included: 1) Feed rate, 2) Sag mill speed, 3) New feed water addition rate, 4) Bearing pressure, 5) Power draw, 6) Current, 7 ...

The Barrick North Mara Mine and the Advanced Systems Group at SGS Minerals collaborated on the implementation of a grinding expert system for the control and optimisation of a single semi autogenous (SAG) mill. Over the last 5 years, grinding …

Advanced Systems Group of SGS has been involved in another expert control system for SAG mill in Barrick North Mara mine in Tanzania. This expert control system is created with SGS's MET expert console and is running on Gensym's G2 real time interface softwate.

This non-invasive vibration monitoring and expert system generates both build-up and blockage alarms to help detect and predict blockages immediately to prevent equipment damage and respond quickly. SAG and Ball mills are one of the most critical pieces of equipment for mining processes. Operators need to optimize grinding mill performance and ...

technology. Installations in primary ball mill circuits and SAG/Ball Mill circuits have often witnessed throughput increases from 5-6% and realised expert system utilisation higher than 90% for the time the grinding circuit was available for advanced control operation. PRIMARY BALL MILL EXPERT STRATEGY A ball mill control strategy first determines

SAG mill recycle from the primary discharge screen (+5/16 inch) is processed through a 1352 Omnicone crusher (4.5 foot). A secondary SAG discharge screen (+1/8 inch) closes the SAG circuit. The ball mill circuit is closed with 6 Krebs super D20 cyclones. Line 2 grinding circuit is comprised of a 24 by 12 foot 4000 horsepower Fuller ...

SAG and ball mills hold-up and power draw, recycle crusher, cyclones and their feed pumps, and the control system. The results from the dynamic simulator are presented below. Figure 5 – Long-term trend (1day/interval) for pebble crusher feed rate (SAG mill recycle) Figure 6 – Long-term trend (1day/interval) for cyclone feed rate (from ball

The main problem with these harder ore types is that they hold up in the SAG mills, restricting throughput. The SAG mill feed is controlled by the mill weight, measured by 4 load cells on the mill bearing system. Therefore if the ore does not grind quickly enough in the SAG mills, the mill weight increases and the control system reduces feed to ...

Each milling circuit is unique, and as such the goals and most optimal control strategy might differ for individual cases. Process IQ is an expert in implementing control systems for SAG and Ball milling circuits, making use of advanced stabilisation …

Another mining application required a model, although this model was a set of rules for an expert system. Chino Mines is implementing AI for a copper milling and flotation circuit. The expert system will control two semiautogenious (SAG) mills, four ball mills, and a flotation circuit.

The SAG mill circuit is part of a 19000 tpd copper/go1d plant. A schematic diagram of the SAG circuit and instrumentation is shown in Figure 2. Before implementation of the model based control strategies the circuit throughput wae verified for …

AG/SAG mills can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill, and some or all of the work of a ball mill. Because of the range of mill sizes available, AG/SAG milling can often be accomplished with fewer lines than in a conventional rod mill/ball mill circuit. A diagram of types of AG/SAG ...

Figure 4 - Mill Conditions: Too Fast, Too Empty, Full Mill (left to right) After the polar plot is checked to determine if a mill is operating at too high an RPM, the fill levels are monitored. Figure 5 illustrates a trend taken from a SAG mill running under expert system control using bearing pressure as the primary control variable.

The Millstar Advanced Control System has a comprehensive suite of control strategies that can be applied to provide an innovative control solution for almost any milling circuit configuration. The main goals are: • Stabilise the mill feed. • Control product quality to the downstream processes. • Optimise throughput and grinding efficiency.

Expert systems in SAG mill control Expert Systems allow hand coding of operator control actions such that these can be automated as a type of auto-pilot for a process. They are explicit, non-optimal systems tracking the process and executing control …

A plant-scale validated MATLAB-based fuzzy expert system to control SAG mill circuits more. by ... The first proposed flowsheet consists of existing SAG mill circuit and a new proposed ball mill in closed circuit with a new second hydrocyclone package. The second proposed flowsheet consists of existing SAG mill circuit followed by a new ...

With more than 100 years of experience in ball mill technology, Outotec ball mills are designed for long life and minimum maintenance. They grind ores and other materials typically to 35 mesh or finer in a variety of applications, both in open or closed circuits.

As a counter to this a computer system to provide effective expert help to operators of semi-autogenous (SAG) grinding mills has been developed. This support system is called HelpSAG. It was initially developed for a SAG/ball mill grinding circuit on the gold plant at Paddy's Flat in Western Australia.

Ball Mill Grinding Media Options. Apr 26, 2019· A ball mill is a form of grinder that is used to blend or grind materials for use. It is a cylindrical device mainly for grinding material such as iron ores, ceramic raw materials, glass, steel, etc. The ball mill works on impact and attrition principle.

The expert system had to maintain a consistent cyclone feed density, between 54 and 56 percent solids, in order to maximize cyclone throughput. The cyclone feed density also directly impacted the ball mill loading and the thickener underflow density (the final product of the grinding operation – the C.l.L. feed).

of the set point optimising control system is planned to be completed by mid 2002 and comprises of a supervisory grinding circuit control system Prior to the SAG mill control system being implemented the control room which over looks the SAG mill and the ball mills to produce a grinding operator used to run the SAG mill manually.

1. Introduction to the Metcom System. To know the technical and economic reasons for applying the Metcom System to plant grinding operations. 2. Mill Power Draw. To determine mill power draw characteristics and capabilities for rod, ball and AG/SAG mills. 3. Mill Power and Charge Level Measurements.

After closed-circuit secondary crushing, the SAG mill feed 80% passing (F80) size was 25 mm to 30 mm. Installed grinding power is split equally between the two mills with the SAG mill fitted with a variable speed drive (VSD). SAG discharge screen oversize ('pebbles' or 'scats') was recycled through an 185 kW pebble crusher.

Results of this evaluation indicated an average improvement in Sag mill tonnage of 10.6% for Sag mill 1 and 8.6% for Sag mill 2. These results are shown in histogram form below. Based on plant historical data, implementation of Expert ball mill control resulted in a reduction in the average P80 of approximately 2% points.

Closed circuit systems for ball mills royalcrescentgroupinall mill of closed system verwijderingasbestbe optimization cement mill system cm1 is a ball mill in closed circuit with a high efficiency classifier and a pregrinding system cm2 is an open circuit ball mill ore info closed circuit cement grinding ... Modeling and Process Control A ...

The two main variables for controlling the SAG mills are feed and speed. Feed is presently controlled automatically via an expert system that adjusts the amount according to readings taken off of multiple bearing pressure load cells on each mill.

December 20, 2016. Keywords: ball mill grinding process, model predictive control, equivalent-input-disturbance, disturbance rejection. Abstract. Stable control of the ball mill grinding process is very important to reduce energy losses, enhance operation efficiency, and recover valuable minerals. In this work, a controller for the ball mill ...

grinding circuit containing a ball mill. There are two lines consisting of this SAG - ball mill combination where the SAGs are denoted as SAG1 and SAG2. Note: Each SAG mill is operated in a closed circuit manner in conjunction with a typical …

The Manta Cube ® system can be used to control various processing units and has been successfully used for SAG Mill Control, Ball Mill Control, ... and more. The Manta Cube ® utilises advanced control fundamentals, including constraint control, feed forward control, expert system control, ... Guaranteed improved plant or circuit performance.

PRIMARY BALL MILL CIRCUIT. A flowsheet of the primary ball mill circuit is shown in Figure 1, indicating . the various control loops and process measurements available to be utilized by an expert system. The circuit consists of two identical . primary ball mills running in parallel with an overall processing capacity of 2500 TPD.

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 ...

Since October 2003, the BHP Billiton Cannington mill has operated a grinding circuit consisting of an AG mill, pebble crusher and a Vertimill®which in this paper will be referred to as an AVC circuit. What is unique about this circuit is that it utilizes a Vertimill® for secondary grinding rather than the conventional ball mill.