# effect of grate discharge area of sag mill performance

### Improved Relationships for Discharge in SAG/AG Mills

The literature exposed a clear lack of previous research on the influence and performance of grate/pulp lifter design in AG/SAG mill discharge. The current understanding from literature lacks knowledge of mill content size distribution and its effect on discharge through the grate at various aperture sizes and radial positions. It also indicates that in order to advance the understanding in a ...

Get PriceEmail contact### Slurry flow in mills: grate-pulp lifter discharge systems ...

The performance of the pulp lifters in conjunction with grate design determines the ultimate flow capacity of these mills. Although the function of the pulp lifters is simply to transport the slurry passed through the discharge grate into the discharge trunnion, their performance depends on their design as well as that of the grate and operating conditions such as mill speed and charge level ...

Get PriceEmail contact### (PDF) Understanding the effects of liner wear on SAG mill ...

the effects of grate wear on mill performance to be quantified. Fig. 13: Breakage rates of all surveys. The calculated breakage rates (Fig. 13) will be a useful measure of the ch ange in mill ...

Get PriceEmail contact### How a Grate Discharge Ball Mill Works

Here I try to explain how ground slurry is discharged from a grate ball mill (or SAG). How it works is, the slurry flows across the grate as it would a screen panel. On the other side of the grate/screens are veins like a pump impeller. As the mill turns/rotates the slurry is “pumped” out and discharged. Discharge Grates The natural flexibility of rubber has allowed rubber manufacturers to ...

Get PriceEmail contact### (PDF) Influence of feed size on AG / SAG mill performance

This paper differentiates scrubber and AG mill modelling in a similar way that overflow ball mills and grate discharge ball mills are analysed. Smaller scrubbers (600 kW) are suited to small scale ...

Get PriceEmail contact### Overflow Versus Grate Discharge Ball Mills: An ...

Recent developments in understanding the importance of material transport in performance improvement of AG/SAG mills and the limited research work on comparing discharge mechanisms in balls mills has led to the present investigation. A set of experimental test work has been carried out in a continuous pilot ball mill of 0.41m X 0.56 m (diameter X length) at different mill speeds, percent ...

Get PriceEmail contact### Slurry flow in mills: grate-pulp lifter discharge systems ...

01/07/2003 Influence of open area on discharge rate through the grate-only and grate-pulp lifters with medium size radial pulp lifter (MRPL): (a) grate-only discharge and (b) grate-pulp lifter discharge. However, with the pulp lifters fitted, the discharge rate was found to marginally decrease up to 7.05% open area and then remained constant with further increase in open area ( Fig. 12b ).

Get PriceEmail contact### Grate Discharge Sag Mill - Fact Jeugd Noord

Grate Discharge Sag Mill. 2018-10-22ball mill discharge screenow to calculate the ball mill discharge size distributionand the ball mill discharge combine, in grate discharge type ball mill, a grate is provided at the discharge end of shellthe sag mill discharge is screened on a rotating trommel screenall load, mill speed, trommel screen aperture, pebble.

Get PriceEmail contact### (PDF) Slurry flow in mills: Grate-pulp lifter discharge ...

Pulp lifters, also known, as pan lifters are an integral part of the majority of autogenous (AG), semi-autogenous (SAG) and grate discharge ball mills. The performance of the pulp lifters in ...

Get PriceEmail contact### The effect of grate design on the behaviour of grate ...

01/09/1986 Mori et al. (1967) measured hold-up of dry solids in a pilot grate-discharge mill and found that the %open area in the grate had very little effect on hold-up (presumably because the mill was a relatively long one, with length/diameter ratio of 3.6, so that the end-effect provided by the grate was small). Gupta et al. (1981, 1982) have reported data measured on various ores in a 0.4 m 0.4 m ...

Get PriceEmail contact### STARTLING EFFECT OF BALL SCATS REMOVAL ON SAG

The discharge grates of the SAG mill were identified as a key component in the SABC circuit, and their design is a crucial factor in the mill's performance [17] [18][19][20][21]. The initial ...

Get PriceEmail contact### Converting a ball mill from overflow to grate discharge ...

23/06/2020 The grate discharge arrangement removes this slurry pooling effect almost completely. Estimates of the increases in power draw possible with grate discharge ball mills range from 10% to 20%, according to mill size and other operating parameters. The figures from pilot tests and some operating sites are even higher, up to 25% more power draw. If a mill has available power,

Get PriceEmail contact### Optimizing your SAG mill operation - International Mining

The discharge rate depends on how efficiently the discharge pump (grate and pulp lifters) operates. Similar to the impeller design affecting pump capacity, the pulp lifter design affects the discharge capacity (or mill throughput) of AG and SAG grinding mills. Generally, the discharge from AG/SAG mills consists of one or both of the following components: slurry (water and finer particles) and ...

Get PriceEmail contact### Taking Control of the Mill Feed R2 - Orway Mineral Consultants

performance. This necessitated increasing the power available to the SAG mill and reconfiguring the ball mill to a grate-discharge unit to draw full motor power. Manipulation of the proportion of secondary crushed feed allowed balancing of the duty between the SAG and ball mill. Diverting primary crushed ore to a surge bin ahead of a secondary crusher, and allowing the bin to overflow into a ...

Get PriceEmail contact### The effect of grate design on the behaviour of grate ...

01/09/1986 Mori et al. (1967) measured hold-up of dry solids in a pilot grate-discharge mill and found that the %open area in the grate had very little effect on hold-up (presumably because the mill was a relatively long one, with length/diameter ratio of 3.6, so that the end-effect provided by the grate was small). Gupta et al. (1981, 1982) have reported data measured on various ores in a 0.4 m 0.4 m ...

Get PriceEmail contact### Grate Discharge Sag Mill - Fact Jeugd Noord

Grate Discharge Sag Mill. 2018-10-22ball mill discharge screenow to calculate the ball mill discharge size distributionand the ball mill discharge combine, in grate discharge type ball mill, a grate is provided at the discharge end of shellthe sag mill discharge is screened on a rotating trommel screenall load, mill speed, trommel screen aperture, pebble.

Get PriceEmail contact### Converting a ball mill from overflow to grate discharge ...

23/06/2020 The grate discharge arrangement removes this slurry pooling effect almost completely. Estimates of the increases in power draw possible with grate discharge ball mills range from 10% to 20%, according to mill size and other operating parameters. The figures from pilot tests and some operating sites are even higher, up to 25% more power draw. If a mill has available power,

Get PriceEmail contact### Taking Control of the Mill Feed R2 - Orway Mineral Consultants

performance. This necessitated increasing the power available to the SAG mill and reconfiguring the ball mill to a grate-discharge unit to draw full motor power. Manipulation of the proportion of secondary crushed feed allowed balancing of the duty between the SAG and ball mill. Diverting primary crushed ore to a surge bin ahead of a secondary crusher, and allowing the bin to overflow into a ...

Get PriceEmail contact### SOSSEGO SAG MILL - 10 YEARS OF OPERATION AND

At the time, the circulating load was approximately 20% to 25% of fresh ore fed into the SAG mill, at a rate of approximately 1,100 – 1,200 tons/hour. The mill was operating with discharge grates with 8.6% open area and 63.5-mm pebble ports. This grate set-up was used from March through December 2004. Since then, several changes were made in ...

Get PriceEmail contact### Industrial Grinding Estimation of Blended Ore from ...

with adding 8% grinding media, appropriate lifters and liners profile, and discharge grates with 15 and 30 mm openings. The aim of the industrial experiment was to assess the benefits of SAG mill grinding, and to evaluate the grinding and classification efficiency of the associated ball mills closed with hydrocyclones. The particle size distribution curves showed that there is no significant ...

Get PriceEmail contact### Optimization of mill performance by using

balls and blocking the grate discharge. Optimization of mill performance by using online ball and pulp measurements by B. Clermont* and B. de Haas* Synopsis Ball mills are usually the largest consumers of energy within a mineral concentrator. Comminution is responsible for 50% of the total mineral processing cost. In today’s global markets, expanding mining groups are trying to optimize mill ...

Get PriceEmail contact### Total primary milling cost reduction by J improved liner ...

Grate discharge to overflow conversion in UG2 In order to reduce the ball wear rate, Plant C converted their primary ball mill from grate to overflow discharge while monitoring different parameters before and after the conversion. The feed to the mill had 6.98% and 15.83% passing 75 and 150 microns respectively. F80 = 12 mm

Get PriceEmail contact### TECHNICAL NOTES 8 GRINDING R. P. King

Grate discharge Dry Grate discharge Wet Overflow discharge Wet Figure 8.5 Effect of mill filling on power draft for ball mills. The data is taken from Rexnord Process Machinery Reference Manual, Rexnord Process Machinery Division, Milwaukee, 1976 The effect of varying mill speed on the power drawn by the mill is shown graphically in Figure 8.4 The speed of rotation of the mill influences the ...

Get PriceEmail contact### (DOC) Main text Gurubasayya Swamy - Academia.edu

The important tools mill soft flow mod will help engineers to analyze understand the influence of the internal components of SAG mill shell lifters, grate pulp lifters respectively on SAG mill efficiency. From the study on effect of pebble crusher bypass on SAG Mill performance, it can be concluded that when pebble crusher is bypassed on immediate drop of throughput ranging from 10--20 ...

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