Sag Mills Optimized

If the process cannot be stabilized, the SAG mill cannot be optimized. To achieve the maximum potential of the SAG mill (installed power and resulting throughput), base layer controls in the existing operations need to be configured to minimize the impact of process variability on SAG mill stability.

SAG Mill Optimization using Model Predictive Control ANDRITZ AUTOMATION Semi-Autogenous Grinding mills can be optimized for maximum ore throughput or maximum grinding energy efficiency. SAG mill, model predictive control, MPC, expert systems, optimization, Laguerre

• Operating the SAG mill in a optim al speed range (65-75% critical); • Reducing the ball size in SAG m ill from 5 to 4 inches balls; • Returning up to 20% of the c yclone underflow back to

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 ball mills. Hence, typical gold or copper ore requires between 2.0 and 7.5 kWh per ton of energy to reduce the particle size.

For SAG mills, the searching for the new operating point involves the solution of an optimization problem, which requires a clear definition of the objective function, constraints and the method

Through the analysis, it can be seen that the optimized liner can effectively lift the material of the semi-autogenous mill to the discharge outlet for discharge, avoid the formation of pulp pool, and greatly improve the processing capacity of the mill It can effectively reduce the pulp backflow, reduce the abrasion of pulp lifter, prolong the service life of lining plate, reduce the times of mill shutdown and

SAG Mill Control . SAG mills can be optimized for maximum ore throughput or maximum grinding energy efficiency. In both cases, precise control of the mill filling percentage is critical (Wills and Napier-Munn, 2006). Maintaining constant mill weight, as indicated by bearing pressure, is

ABB’s GMD is the most powerful mill drive system in the market to power semiautogenous (SAG), ball and autogenous (AG) mills, This ’workhorse’ for grinding operations combines a robust, service-friendly and fit for purpose design to provide highest throughput, reliability

As a result, ABB developed three of the largest diameter and most powerful drive systems for a SAG and two ball mills installed at the highest altitude to date. The fully integrated and optimized solution for the grinding circuit consists of: 1 x 28 MW GMD to power the 40 ft SAG mill; 2 x 22 MW GMDs to power two 28 ft ball mills

The Grinding Circuit optimization Application is the first technology to accurately predict critical SAG Mill performance variables. It then correlates this data to give an accurate picture of conditions inside the mill. This allows mines to reduce downtime in operations by reducing scheduled liner wear inspections and unnecessary changes.

costs of conventional vs. SAG/FAG flow sheets. 2. Fragmentation costs may favor blasting over milling wherever feasible. 3. The growing shortfall of electrical demand may be eased through implementation of increased powder factors. 4. Blasting will not create larger pieces of media rock where fissile bedding and highly jointed predominate. 5.

Improving Energy Efficiency Via Optimized Charge . Improving Energy Efficiency Via Optimized Charge Motion and Slurry Flow in Plant Scale Sag Mills. Authors: Raj K Rajamani · Sanjeeva Latchireddi · Sravan K Prathy · T N PatraAffiliation: University of UtahAbout:

As a result, ABB developed three of the largest diameter and most powerful drive systems for a SAG and two ball mills installed at the highest altitude to date. The fully integrated and optimized solution for the grinding circuit consists of: 1 x 28 MW GMD to power the 40 ft SAG mill; 2 x 22 MW GMDs to power two 28 ft ball mills

The Grinding Circuit optimization Application is the first technology to accurately predict critical SAG Mill performance variables. It then correlates this data to give an accurate picture of conditions inside the mill. This allows mines to reduce downtime in operations by reducing scheduled liner wear inspections and unnecessary changes.

Some of the critical comminution optimisation strategies included. :•De-constraining the SAG mill throughput with optimized operational load set points and revised process control. •Redesigning the SAG mill liners for optimum load and speed control.

The question what drive system is optimal for SAG and ball mills is project specific and depends on the plant layout and the design of the grinding circuit. When drives systems are compared the main criteria are operating characteristics (fixed speed or variable speed, starting behavior, interaction with network, harmonic distortion),

SAG (semi-autogenous) milling circuit is described with the emphasis on the process assesses the degree of optimized behaviour, and allows for interaction to correct for deviances, and more importantly, discharge mills (= 3.395 rad) =

According to the authors, through continuous improvement and the use of advanced technologies like SmartEar, Pueblo Viejo—a joint venture between Barrick (60%) and Goldcorp (40%)—is improving the control and operation of its SAG mill, resulting in reduced liner wear, more efficient mill performance and optimized energy consumption.

The rule-based expert system for SAG, Ball Mills, VRM’s and also combined systems secures a permanent optimum production and energy efficiency without any manual interaction necessity. The development of the so-called “electronic ear” SMARTFILL system started around the year 2000 and was under continuous enhancement and adaption to modern requirements over the last years.

Engineering. Gearless mill drives are a well established solution for grinding applications in the minerals and mining industries. The paper describes the functionality and technical features of such drive systems as well as their advantages compared to other drive solutions. Due to the variable speed operation the grinding process can be optimized