sag mill filling up with ore ademkeer.be. SAG mills are autogenous mills but use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. sag mill pooling issues Grinding Mill China. sag mill pooling issues. Sag mill filling up with ore Gulin Machinery. Sag mill filling up with ore.

TECHNICAL NOTES 8 GRINDING R. P. King

2009-7-30 · material in the mill including the media which may be steel balls in a ball mill, or large lumps of ore in an autogenous mill or a mixture in a semi-autogenous mill, as well as the slurry that makes up the operating charge. Let Jt be the fraction of the mill volume that is occupied by the total charge, Jb the fraction of the mill volume that

Autogenous and Semi-Autogenous Mills

An ore like quartzite is very competent and will not break up easily in an SAG mill. Soft and fragile ore like bauxite or specular hematite will break up relatively easily. Again, clayey and oxidised ore may be too soft to serve as a grinding medium and therefore are classified as incompetent ore.

Improved Relationships for Discharge in SAG/AG Mills

2019-10-9 · filling in the mill and not related to total mill filling. Discharge through an individual opening on the grate is driven by the factors of ore filling, radial position and the size of the aperture. The results indicate that 1.18 mm is approximately the size below which particles

RoM BALL MILLS

II-314 RoM Ball mills a comparison with AG/SAG Milling Aubrey N. Mainza1 and Malcolm S. Powell 1 1Mineral Processing Research Unit, University of Cape Town, Rondebosch, 7700, South Africa

Control of a grinding mill circuit

2018-11-28 · A single-stage closed run-of-mine (ROM) ore milling circuit, as shown in Fig. 1, is considered in this study. The circuit consists of a semiautogenous (SAG) mill with an end-discharge grate, a sump and a hydrocyclone. The mill receives four streams as inputs: mined ore (MFO), water (MIW) to assist with

Performance enhancement tools for grinding mills

2009-8-26 · the mill load, audible as a continuous stochastic noise. An example of the waveform of this noise may be found in Figure 6, obtained on a 36' diameter mill running at 8 rpm and well filled with mineral. When the minerals hold-up in the mill decreases, the mill noise intensity grows inversely, as shown in Figure 7.

Comparison of Ore Hardness Measurements for Grinding

2013-5-6 · Comparison of Ore Hardness Measurements for Grinding Mill Design for the Tenke Project John Starkey1, Principal Consulting Engineer (SAG to T80 12 M followed by Bond BM Wi on SAG ground ore) Bond Ball Mill Work Index (Crushed Feed) Specific Gravity (part of the SAGDesign test). These are tests which up to the present have been

Mill (grinding)

2019-10-2 · SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 42' (12.8m) in

MODELING THE SPECIFIC GRINDING ENERGY AND BALL

2017-1-3 · 2 MODELLING THE SPECIFIC GRINDING ENERGY AND BALL-MILL SCALEUP Ball-mill scale up (Bond's Law)Data: zBond work index w i zFeed D f and product d size (both 80% cumulative passing) Result: The specific grinding energy w Mill power draw P = wT, where T the mill capacity Mill dimensions (from Tables or charts)

MINE LINERS

2018-6-7 · Mill size (diameter, length) Maximum ball top-up size Mill rotational speed (rpm, variable or fixed speed, single or dual rotation) Ore type (abrasivity of the ore) Mill discharge type (grate discharge mill, overflow mill) Available drilling pattern Total filling degree (ore and balls) FAG & SAG Main design parameters:

Optimization of mill performance by using

2015-4-16 · The mill filling should be measured at a minimum of 3 points along the mill. Excess of slurry could also be estimated. To get rid of pulp and rocks in the charge, a mill grind-out (no ore feed) of 10 to 20 minutes is also performed before mill inspection or relining. The complete grind-out fills up but remains unsaturated (media angle

Mineral movement simulation through the grates and

2019-5-15 · angle increases the mill's outlet flow. Keywords: grate, SAG-Mill, DEM-Simulation, flow-back, carry-over 1. Introduction Size reduction of ores has an important role in the process of obtaining various metals. For example, for copper the ore must be separated from the mineral and must reach sizes smaller than 50 m, and this

Autogenous and Semi-Autogenous Mills

An ore like quartzite is very competent and will not break up easily in an SAG mill. Soft and fragile ore like bauxite or specular hematite will break up relatively easily. Again, clayey and oxidised ore may be too soft to serve as a grinding medium and therefore are classified as incompetent ore.

Online SAG Mill Pluse Measurement and Optimization

Online SAG Mill Pluse Measurement and Optimization signature could be effectively used to optimize the milling performance by investigating this signature's relation to mill product size, mill throughput, make-up ball size, mill speed, liner profile and ball addition rates. The mill speed, ball size, and mill filling were varied here

() SAG milling at the Fimiston plant (KCGM) | John

Product from the SAG mill passes through internal grates onto a trommel screen which scalps +7mm material and returns it to the SAG mill feed conveyor. In situ Block Size 1.103 m SAG mills require a certain ore feed size distribution to operate efficiently. run at a constant mill filling and speed, and hence constant power, so 10mm with

Optimisation of a Fully Autogenous Comminution Circuit

2016-4-8 · 11.16 The distribution plot of the primary mill manipulated variables (B) (post-MPC)123 11.17 The distribution plot of the primary mill disturbance variable (post-MPC) 123 11.18 The distribution plot of the primary mill's e ective power usage (post-MPC) 124 11.19 The mill power frequency and minimum variance comparison between pre

HIGH INTENSITY GRINDING ISSUE 32 AT ITS FINEST

2017-6-27 · manufacture of a Ø40'x29' SAG mill. The mill will be driven by a Gearless Motor Drive (GMD) which, at 28.0MW, is equal to the largest grinding mill power ever used in the mining industry. The SAG mill design is based on Outotec's proprietary grinding mill technology, developed over decades for maximum reliability and performance.

GROSS POWER CALCULATOR

2018-4-26 · Pictures of the insides of an AG mill and a SAG mill which have been crash stopped are shown in Figures 5 and 6 respectively. Accurate measurements of the ball filling can only be made after the mill is ground out. In this case the mill is operated with the feed turned off until all of the ore has exited the mill.

Ball mill

2019-10-15 · The ball mill is a key piece of equipment for grinding crushed materials, and it is widely used in production lines for powders such as cement, silicates, refractory material, fertilizer, glass ceramics, etc. as well as for ore dressing of both ferrous and non-ferrous metals. The ball mill can grind various ores and other materials either wet

SAG Mill Grinding Circuit Design

Milling curves as a tool for characterising SAG mill performance. SAG mill filling is a critical parameter for SAG mill . mill fills up with ore or grinds down.

Loveday/Barratt SAG model

2018-6-26 · History. Brian Loveday (1978) published a scale-up procedure for autogenous pilot plant power draw to industrial sized machines that used an empirical power number to encompass all the motion effects of a mill charge. Derek Barratt (2002) derived a set of power numbers for industrial machines for use in Loveday's base formula, where a power number for a particular mill filling and

OPTIMIZATION OF THE SAG MILL CIRCUIT AT

OPTIMIZATION OF THE SAG MILL CIRCUIT AT KINROSS PARACATU BRAZIL. from ore characterization, through SAG mill practices and finally ball mills

Converting AG to SAG mills: The Gol-E-Gohar Iron Ore

The mill filling was 21% which was sufficient to provide self protection of the mill shell from direct impacts of balls. The first and the most important effect of conversion to SAG milling was the stability of the process judged by the stable power draw of the mill.

() Milling curves as a tool for characterising SAG

Milling curves as a tool for characterising SAG mill performance. SAG mill filling is a critical parameter for SAG mill . mill fills up with ore or grinds down.