> Learning curve start with very low ball charge and build up over time. Do not let the mill charge run down > Soft oxide ore low charge high risk of liner damage can be catastrophic > First set of liners should take ore into account conservative design > Low feed rates only with low ball charges use mill trajectory modelling
discharge of product from the SAG Mill is ejected w hich can cause the scats conveyors to become overloaded or trip. These are rarely observed from a single flop gate event but usuall y from ...
Table 4: JK MRC Comminution Parameters. SAG milling in closed circuit with a vibrating screen followed by a ball mill. OMC ARM FDW. No. of Units 1 1 1. Diameter m Length m 4 ...
The Discharge End Megaliner builds on the Megaliner™ concept the company introduced in 2012. Designed to reduce downtime by minimising the number of parts and people inside the mill during a relining process, the Megaliner has so far been installed in over 30 mills around the world. A Megaliner element integrates multiple lifter and ...
Discharge of pebbles, finer rock, ball scats and slurry from mills and its flow through trommels, and into other processing operations has strong impacts on overflow ball mill performance.
The trunnion magnet is mounted at the SAG ball mill discharge point and is used in place of a trommel screen. ... The effective removal of chips and scats from a ball mill leads to lower power consumption from the mill drive. Eriez' trunnion magnet can provide the solution—a powerful and efficient magnetic separator that can effectively ...
An increase of over 10% in mill throughput was achieved by removing the ball scats from a single stage SAG mill. These scats are non spherical ball fragments resulting from uneven wear of balls ...
Our wet Ball Mill griding media reject (scats) from the trommel screen is an odd shape ( see photo attached). I'm not use to this wear shape of grinding media in a ball mill. ... first is in open circuit with feed rate of 125 t/h and its discharge goes to the sump of hydrocyclone and together with discharge of second ball mill, enters to the ...
how does a ball mill discharge scats ore mineral crushers. sag mill balls sino grinding industries sino4 balls were designed to save the mine ball costs when . how a sag mill works Crusher South Africa
Vertimill® is an energy efficient grinding machine. They tend to grind more efficiently than, for example, ball mills with feeds as coarse as 6 mm to products finer than 20 microns. This provides up to a 40% higher energy efficiency . With the Vertimill® simple and robust design, limited liner replacement is required.
ballonshell impacts just above the charge toe, owing to the risk of ballonliner damage and excessive metal flow. In fixedspeed mills, this may be achieved by increasing charge volume; in variable speed mills, this may be achieved by reducing mill speed; and in both cases this may be achieved by design by increasing the lifter face angle.
The final plan was to increase the ball charge in the SAG and ball mill to 10% v / v and 27% v / v, respectively; set the upper limit of the operating power in the ball mill to 5800 kW; use a TC Series crusher (without a power/feed ratecontrolling device, but with a feed bin) to crush pebbles for recirculation back to the SAG mill feed ...
If you do not need a deep primary grind, a retrofit/conversion might be of value. A very high impact opportunity to increase your ball mill tonnage. A conversion is cheap in price as you can read in the footer. The cost of a ball mill conversion from overflow to grate discharge is 'fairly' affordable at 65,000 for a 13′ x 15′ mill.
Re scats, you have to get these out of the mill at some stage, as these just consume power when they are too small to do any work on the ore. Normally scats are separated out via the trommel screen they simply fall off the end into a scats hopper, whilst the slurry falls through the trommel panels. If using a screen deck, the same applies.
Scats are typically removed as waste and oversize material returned to the mill for regrinding. A trommel is a rotary cylindrical device that is rigidly attached to the discharge end of the mill. It
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.
Ball mill grate discharge with 40 % charge and speed 75 % of critical. For rod mills with 40 % charge and 60 % of critical multiply power figure by Drive motor with min. 10 % higher power should be chosen. Dual drive as per arr. 4. All measurements are for preliminary use only.
There are basically two groups of Grinding Mill Liners. Ones with a HIGH PROFILE and those with a LOW PROFILE. The high profile liner is designed to give the media the higher lift. This type will be used in mills that are designed for primary grinding and as a result require the impact of the higher cascade. Ball mills working as the secondary ...
The volume of pulp in some experiments was increased to mimic pulp filling in an overflow discharge ballmill. All the experiments in this phase were conducted using a silicate ore. ... The effect of scats on ballmill productivity was tested and it was concluded that scats may not have an adverse effect on productivity in secondary ballmills ...
The case of a SAG mill followed by scats (oversize in mill discharge) crushing is usually used to reduce the oversize material by crushing because a) there is not enough competent coarse material in the SAG mill to do this at the required rate or b) there is a hard component in the mill feed which is resistant to breakage by the operating ...
The ball mill discharge density should be checked manually at regular intervals and adjustment made to water ratio controller setpoint to adjust the ball mill discharge density. The grinding circuit operator must ensure that the ball mill runs properly loaded and gives the correct ore grind. A major practical indication of mill loading is the ...
An increase of over 10% in mill throughput was achieved by removing the ball scats from a singlestage SAG mill. These scats are nonspherical ball fragments resulting from uneven wear of balls with included porosity. 30t of scats were removed from a total charge load of 70t.
The SAG Mill has a "small" circulation load of oversize given be the 3/8″ trommel screen and the 1/2″ x 1 1/4″ discharge grates. The load of 4″ balls in this SAG is "good" but unmeasured. SAG Ball consumption is "average" at 400 g/t while Ball Mill grinding media (3″ balls) usage in 550 g/t. Yet, you add steel and nothing ...
In case of continuously operated ball mill, the material to be ground is fed from the left through a 60° cone and the product is discharged through a 30° cone to the right. As the shell rotates, the balls are lifted up on the rising side of the shell and then they cascade down (or drop down on to the feed), from near the top of the shell.
We observed that, particle size decreased significantly due to regrinding while floatability of the feed was more than discharge. Moreover, floatability of each fraction ( 400, +400325) in mill feed and discharge was studied. Results indicated that, the floatability of all fractions in the mill feed was more than the mill discharge.
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Using scanned results for new and worn shell liners for a 32' ( m) SAG mill, it is shown that the feed and discharge lifters have significant effect on the flow of the charge introducing ...
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