Control of the milling circuit with M330, N80, P410, Ql and AO. Figure 4.5 Process inputs of the uncbnstrained Dynamic Matrix Control of the milling circuit
systems focuses on design and optimization of circuits and machine performances. The focus of this project is on simulating the interactions between interior components of a plant a discrete using event approach.An ordinary iron ore processing plant, with several comminution and separation stages, is considered for simulation.
variability associated with most ore bodies. Anglo American Platinum aimed at improving online optimisation of the circuit by implementing industrial model predictive control to reduce system variability and continuously drive towards the optimal operating point within system constraints.
Figure 1 ROM ore milling circuit adapted from Coetzee et al. 2010. 2. ROM ore milling circuit 2.1. Introduction The ROM ore milling circuit see Fig. 1 used for this study consists of a semi-autogenous SAG mill, a sump, and a hydrocyclone. Grinding occurs within the SAG mill using steel balls and the ore. Water is pumped into the
optimization study of the circuit performance was conducted to improve the product fineness through circuit surveys, experimental lab work and simulations. In three full scale sampling campaigns, size distributions and solids contents of the samples were determined at selected points in the circuit.
MacPherson 18 Mill Test Well-instrumented pilot-scale autogenous grinding circuits, ball and rod mill circuits, and crushing circuits are also available for testing and design purposes. In-plant audits allow modeling and simulation of existing plants to assist in optimization. Rotary
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 and optimisation strategies developed by Mintek.
Figure 5.10 Milling kinetics of the SAG mill in the SABC circuit as a function of an ore feed of size -200100 mm under the following simulation conditions J B 10, d B 50 mm, c 65 of critical speed, and grate opening 40 mm with a feed flow of 100 tph .....79 Figure 5.11 Milling kinetics of the SAG mill in the SABC circuit as a function ...
Abstract Autogenous AG milling is utilised around the world for particle size reduction. The system exhibits highly non-linear behaviour in addition to being subject to unmeasured variability associated with most ore bodies. Anglo American Platinum aimed at improving online optimisation of the circuit by implementing industrial model predictive control MPC to reduce system variability and ...
This research is focused on the Phase I SABC milling circuit of the Wushan porphyry copper mine. Improvements to the existing circuit were targeted without any significant alterations to existing equipment or the SABC circuit. JKSimMet simulations were used to test various operating and design conditions to improve the comminution process.
We have developed a new product called MillROC Milling Remote Optimisation Consulting. Variability of the ore, changing equipment conditions, lack of instrumentation and operator training means minerals processing can Orway IQ is at the forefront of global milling optimisation from our operations support centre head office in Perth Australia.
Jun 01, 2015 GRIND CIRCUIT CONTROL One of the key challenges facing todays large concentrators is to maximize throughput while maintaining valuable mineral recovery. As ore grades drop, throughput rates must increase to maintain production targets. Furthermore, the reliance on fewer milling circuits to lower capital costs has resulted in an
The ore is first reduced in size typically 80 passing 75 m to ensure that all non-refractory gold is readily accessible for cyanide leaching. There are several variations of comminution circuits used in the gold industry, such as Multi-stage crushing and pebble andor ball milling circuits
ore treated was very difficult to mill. In the first two days, the mill experienced numerous power dips overloads, and on at least seven occasions the feed to the mill had to be completely stopped to grind the mill out. Also, the mill load varied in the range of 125 to 165 tons. These disturbances propagated throughout the milling circuit and ...
Aug 01, 2015 One of Palabora Mining Companys operations had six parallel milling circuits consisting each of a rod mill followed by a ball mill in open circuit du Plessis, 2001. It reported 0.9 gain in recovery, as well as a throughput gain, using an in-house MPC designed to either reduce particle size for a given throughput, or increase throughput ...
Jul 01, 2005 The plant operates as a modified MF2 circuit primary mill and float followed by treatment of the rougher tails through a secondary mill and float treating UG2 ore through separate high and low-grade circuits and has been a focal point of on-going research and optimisation efforts to improve process efficiency.
There are six parallel conventional milling circuits at Palabora Mining Company. Each milling circuit consists of a rod mill followed by a ball mill in series. Crusher product -9 mm is fed to the rod mill, and the water is fed in ratio to the ore feed mass. The rod mill discharge is pumped, without any further water addition, to the first ...
So far it looks like that there are certain ore types that require too much energy to have them ground down in a conventional SAG-Ball Mill circuit. This is the case where HPGR circuits come handy. When the ore is competent there are less fractures available so the ore gets its
The MillStar Mill Feed Controller will compensate for the feed dynamics by modeling feeder responses, adapt for any model errors and adjust the feeder speeds in a desire. Power Optimisation. Milling operations need to operate close to the maximum mill power draw. The power-load relationship is highly non-linear and shifts around as the ore and ...
In leaching, ore which has been ground to pulp is placed in agitated tanks with sodium cyanide solution and gold and silver is dissolved into the slurry solution. The leach may require 24 to 72 hours to complete, and after the leach is completed, the leached slurry is routed to the CIP circuit.
The AG Mill Holdup System contains the breakage models used to determine a raw mill mass, as well as the solid product flows. A series of factors such as ore hardness, feed water addition, mill filling and cyclone underflow rate alter the breakage parameters of the different feed components.
changes are simulated in order to quantify the potential benefits and rank options according to their merit. Table 1 provides some examples of optimisation projects undertaken by OMC. Table 1 - OMC Optimisation Project Examples Project Circuit Modifications Improvement Ref. Henty 2003 Change SAG mill ball size. Increased cyclone diameter.
parameter that affects milling performance after ore competency. A lot of operations have recognized the optimization opportunity that can be taken advantage of by manipulating the feed size distribution to improve SAG milling efficiency. Hence attention has been paid to partial or
circuits. Some of the approaches are the optimization of the mill load, lling ratio 18, ore to media ratio, media size distribution 19, mill length to diameter ratio, and adding mill ri es 20. In the last few decades, the pretreatment of ore prior to comminution has been proposed 21. Pretreatment denotes