Optimisation of secondary crushing stage …

SAG mill power consumption as a function of the proportion of -152 +25mm in the fresh feed for SAG mills of different diameters (after Casili A. and Silva N.,2015) Mill feed size distribution ...

Optimization of the SAG Grinding Process Using Statistical …

Silva et al. fit a power equation and an energy equation specific to the design of SAG mills, using them to predict energy consumption as a function of mill …

AMIT 135: Lesson 6 Grinding Circuit – Mining Mill …

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

Influence of feed size on AG/SAG mill performance

manuel villon. 2011, SAG 2001. Fluctuations in feed size distribution are second only to ore competence variation in their influence on autogenous and semi-autogenous mill performance. For some operations where feed size is not well controlled this creates significant problems with mill stability and is understandably seen as a major problem area.

Feed size and blasting

AG/SAG mill feed size distributions are the result of how in-situ rock has been blasted and subsequently ... Figure 13 – SAG Mill Feed Distribution from a Normal Blast vs. More Intense Blast

A Hybrid Intelligent Framework for Maximising SAG Mill …

for the Cadia Hill SAG mill circuit, throughput increased by increasing the SAG mill ball charge, reducing the number of lifter rows, reducing the rock charge, and reducing the SAG mill feed size distribution from an average F80 of 100mm to 80mm. These research efforts present interesting findings for increasing mill throughput while also

Feed hardness and acoustic emissions of autogenous/semi …

As primary grinding units which receive feed directly from crushers, industrial AG/SAG mills are difficult to control and stabilise owing to the variability of the feed ore characteristics in terms of hardness (work index), competency, and size distribution (F 80), as well as the harsh operating conditions of the mills (Thornton et al., 2005).

Comparison of Grate Performance (New/Worn) with Feed Size

The cause of the incomplete discharge was not a lack of open area at the discharge cone, as with a fine feed size distribution to the SAG mill (F 80 of 80mm) the discharge system could pass up to ...

Charge segregation and slurry transport in long SAG …

Charge segregation and slurry transport in long SAG mills S. Mwansa, P. Condori, M. S. Powell ... There was a similar size distribution for the combined feed to the mill and slice 1. A strong

Feed Size VS Ball Size

xG is the mill feed d80, not the circuit feed. For SAG mill, the xG value has to be determined by scalping of the full size distribution. The particles larger than the minimum pebble size (given by the pebble extraction grate opening) has to be excluded from the distribution to calculate the top ball size!

Schematic of ideal SAG mill feed size distribution

The IES simulation results indicated that using Mine to Mill strategy by maintaining the target size (P80) at 200 µm, improved economic performance by 8.6 per cent relative to the base case.

Dynamic modeling and simulation of a SAG mill for mill …

The modeling and simulation of semiautogenous (SAG) mills have been widely used in the design and optimization of mill performance in terms of its power draw, processing capacity and product size distribution. ... The transient response of mill behavior with respect to changes in feed size distribution, tonnage and mill feed water …

Inferential measurement of SAG mill parameters III

The panel on the lower left shows the SAG mill total feed size distribution for the simulated stream, specified fresh feed stream plus the oversize crusher product, and as calculated by the inferential total feed model given in Eq. (35).

Optimisation of the Cadia Hill SAG mill circuit

Ø Reducing the SAG mill feed size distribution from an average F80 of . 100mm to 80mm resulted in an increase in SAG mill throughput of . 200tph. Modified blast designs have demonstrated this ...

Evaluating the Effect of Feed Particles Size and Their

Nowadays, experimental semi-autogenous (SAG) mill and drop weight test are used for evaluation of grinding circuit regarding changes in feed particle size distribution, size of the ball, speed of ...

What's the Difference Between Ball Mill, Rod Mill and SAG Mill?

Ball mill： Ball mills are the most widely used one. Rod mill： The rod mill has the highest efficiency when the feed size is <30mm and the discharge size is about 3mm with uniform particle size and light overcrushing phenomenon. SAG mill: When the weight of the SAG mill is more than 75%, the output is high and the energy consumption …

Acoustic Sensing and Supervised Machine Learning for …

Powders 2023, 2 300 1. Introduction The operations of AG/SAG mills are known to be sensitive to the changes in feed particle size distributions presented to the mill [1].

SAG Mill Grinding Circuit Design

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Comparison of SAG mill feed size & throughputs

WEBFigure 1 shows a range of M4A SAG feed size distributions compared with an M1 feed size distribution. It is clear that the M1 material fragments very finely in the blast -producing about 70% minus ...

Robust control of a SAG mill

Fig. 3 compares the regulatory response of two robust SAG mill controllers to a number of step changes in the disturbance variable F 80.At t=5 h, F 80 was stepped up from 61.5 to 63.3 mm (i.e. the feed particle size distribution was increased), while at t=36 h, F 80 was stepped down from 63.3 to 57.7 mm (i.e. the feed particle size distribution …

The influence of feed size on autogenous and semi

Figure 13 – SAG Mill Feed Distribution from a Normal Blast vs. More Intense Blast ... W. 2001 "Influence of Feed Size on AG/SAG Mill Performance". SAG 2001, Vancouver, Canada, pp203-214 .

Pre-Processing to Increase the Capacity of SAG Mill …

As the feed size distribution commands the charge volume and thus the SAG mill power draw associated with competent ores, various industrial operations later included additional crushing stages for increasing the throughput of existing SAG mill circuits [5]. In the case of such modification, the SAG mill product is coarser compared …

SAG Mill Liner Design

Based on experience, mill-liner designs have moved toward more open-shell lifter spacing, increased pulp lifter volumetric capacity, and a grate design to facilitate maximizing both pebble-crushing circuit utilization and SAG mill capacity. As a guideline, mill throughput is maximized with shell lifters between ratios of 2.5:1 and 5.0:1.

Influence of feed size on AG / SAG mill performance

Semantic Scholar extracted view of "Influence of feed size on AG / SAG mill performance" by S. Morrell et al. ... Head grade, dilution, particle size distribution and … Expand. 14. PDF. Save. Performance characteristics and optimisation of the Fimiston (KCGM) SAG mill circuit. M. Nelson W. Valery S. Morrell. Engineering. 1996; 8. Save.

Influence of Feed Size on AG/SAG Mill Performance

However, the finer feed size distribution consistently results in 50% higher throughput than the coarser one. 1 10 100 100 1000 10000 100000 size (microns) cum%pass SAG 1 feed SAG 2 feed Figure 6: Feed Size Variation Caused by Stockpile Segregation 20 …

The influence of feed size on autogenous and semi

This paper describes the influence of feed size distribution on ag/sag mill performance with reference to a range of plant data. It particularly concentrates on how changing blasting practice to modify ag/sag feed size can have a considerable overall benefit.

A NEW WAY OF REPRESENTING A AND b PARAMETERS …

parameters used by the AG/SAG mill model in JKSimMet which permits prediction of the product size distribution and the power draw of the AG/SAG mill for a given feed size distribution and feed rate. In a design situation, the dimensions of the mill are adjusted until the load in the mill reaches 25% by volume when fed at the required feed rate.

Influence of explosive energy on the strength of the rock …

A relationship between t a and the feed size distribution parameter F 80 for a SAG mill were developed at the JKMRC (Morrell and Morrison, 1996). For the three samples above, the t a is very similar and the average t a is 0.33. Based on this value, the SAG mill feed size distribution for a parameter F 80 would be 104 mm.

(PDF) The appropriateness of the transfer size in …

This is because the product size distribution from AG/SAG mills tends to have more fine material than the HPGR circuit product (Morrell, 2009; 2011) and hence need less ball mill power. Based on ...

Acoustic Sensing of Fresh Feed Disturbances in a …

The mill feed size distribution was prepared by crushing the model quartz with a laboratory jaw crusher and sized into −12.7 + 2 mm and −26.5 + 16 mm feed particle size fractions. ... R.K. Differentiation of …

Powders | Free Full-Text | Acoustic Sensing and Supervised

The operations of AG/SAG mills are known to be sensitive to the changes in feed particle size distributions presented to the mill [].The variation of feed particle size significantly affects the overall process control, product quality, and economic performance of the mill [2,3,4].Poor product quality from the AG/SAG mill poses significant challenges to …

Multi-component AG/SAG mill model

The breakage rate distributions are affected by a number of operating conditions. Morrell and Morrison (1996) modelled the effect of ball charge, mill filling, feed size distribution and mill speed on each breakage rate. The resulting 5 empirical equations are embedded in the current JKSimMet Variable Rates AG/SAG model.

SAG Mill Testing

The SAGDesign test was developed by the SAGDesign Consulting Group (Starkey, Hindstrom & Nadasdy, 2006) and consists of a batch grinding test conducted in a 0.488m diameter SAG mill. About 10kg of drill core is required for testing. The feed is prepared to 80% passing 19mm and ground to 80% passing 1.7mm.

Evaluating the effect of feed particles size and their hardness …

Nowadays, experimental semi-autogenous (SAG) mill and drop-weight test are used for evaluation of grinding circuit regarding changes in feed particle size …

SAG Mill Feed Particle Size Analyser

The camera was installed 3 mts away from the commercial sizer over the feed conveyor of the SAG Mill. This analyzer was calibrated following the manufacturer's procedure. ... – Measurement of length …

The influence of feed size on AG/SAG milling

The role of the intermediate stockpile between the primary crusher and AG/SAG mill is also described in terms of how it affects size distribution. Hitherto unpublish full-scale plant data are used ...

SAG mill feed size distribution (Dance et al. 2006)

SAG mills have special requirements on feed size distribution, which is influenced by the size distribution of the blasted rock (Esen 2013). The 80% passing size, x 80, is...

Acoustic Sensing of Fresh Feed Disturbances in a Locked …

The mill feed size distribution was prepared by crushing the model quartz with a laboratory jaw crusher and sized into 12.7 + 2 mm and 26.5 + 16 mm feed particle size fractions. The iron ore was also subjected to crushing and screened into 12.7 + 2 mm feed size distribution. The quartz feed