sag mill grate slot size

Discharge grate slot analysis is carried across all grate designs to optimize open area, recycle size and product passing. Large One-piece Super Vortex® curved pulp lifters …

For large mills, using 125 to 140 mm (5 to 5-1/2 in.) feed ball size, conventional new lifter-liner dimensions are around 300 to 350 mm (12 to 14 in.) overall height above the shell, …

The load in such a mill typically contains 250,000–450,000 particles larger than 6 mm, allowing correct representation of more than 90% of the charge in Discrete Element Method (DEM) simulations. Most AG/SAG mills use discharge grate slots which are 15 mm or more in width. The mass in each size fraction usually decreases rapidly below grate size.

In a way, the media size should be selected based on feed size and grate opening. Finer feed (i.e. secondary crushed) justifies a 4" ball but if the grate opening is 60 mm x 100 mm slots then a 4" ball won't last very long. If the feed top-size is >100 mm, then typically a 5" ball is suitable.

The load in such a mill typically contains 250,000-450,000 particles larger than 6 mm, allowing correct representation of more than 90% of the charge in Discrete Element Method (DEM) simulations. Most AG/SAG mills use discharge grate slots which are 15 mm or more in width. The mass in each size fraction usually decreases rapidly below grate size.

Grate design should incorporate an integral radial lifter. This lift on a grate can increase the grate life by up to 50 percent. The slot opening size is determined by the lump size to be retained in the mill. Grate plugging is minimized by …

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 un-measured. SAG Ball …

You need more tonnage and could actually use a larger/coarser transfer size from the SAG to Ball Mill. The ore is "hard" and "bulky". ... Finer feed (i.e. secondary crushed) justifies a 4″ ball but if the grate opening is 60 mm x 100 mm slots then a 4″ ball won't last very long. If the feed top-size is >100 mm, then typically a 5 ...

Improving Energy Efficiency in SAG Mills. Pilot-Scale SAG Mill Facility Will Help to Optimize Charge Motion and Slurry Flow in Plant-Scale SAG Mills - Reducing Energy Consumption. The U.S. mining industry operates approximately 80 semi-autogenous grinding mills (SAG) throughout the United States. Both mine and mill site variables …

application of the DOE method has allowed to back up statistically the results and indicate that the slot 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

Grate Slot Size Reduction. ME Elecmetal's integral approach to mining is committed to add value into processes through fully-integrated ME FIT solutions. In this case, by testing new SAG mill liner designs in order to …

No pebble ports in the grates (SAG circuit). b) Semi autogenous grinding in which the pebble fraction of mill discharge (+½ in.) is taken out through pebble ports for separate crushing and ball milling. The minus ½ in. fraction of mill discharge is recycled to the SAG mill through a classifier.

The finding in this research is to reveal the condition in which a reliable DEM solution is achievable in the appli-cation of a SAG mill. The DEM result sheds insight to the design of the grates like the size and total opening area of the slots. It also provides structural optimization on a new type of grate used in a SAG mill.

Grate Slot Size Reduction ME Elecmetal's integral approach to mining is committed to add value into processes through fully-integrated ME FIT solutions. In this case, by testing new SAG mill liner designs in order to improve throughput, …

Each time the grate enters the mill charge, the horizontal force of the load in the mill deflects the grate. This stretches the rubber and forces any large material …

Ball mills: Ball mills are the stalwart unit of the majority of pilot grinding circuits. ALS has a range of rubber lined overflow ball mills including: 2.3kW, 4.4 kW high aspect (900 mm Dia x 400 mm EGL), 3 x units of 5.5 kW and 7.5 kW (900 mm Dia x 790 mm), 1 x 15 kW 900 mm Dia x 1800 mm EGL, 1 x 30 kW 1240 mm Dia x 1440 mm EGL).

The ball mills are more easily being corroded by pulp in wet grinding process. While BAM's rubber mill lining can well resistant the corrosion of acid and alkalis material, water or other solutions under a certain temperature of 90 C-100 C. Reduced Weight Lower Costs. Our ball mill rubber liners are 75% to 80% lighter than steel liners ...

The role of the grate is to allow the discharge of the material ground in the mill via the slots. With our range of alloys and design experience we can offer the longest possible lifetime with the optimal grinding efficiency. The design of the grates will depend on: Drilling pattern; Mill speed (rpm) Maximum grinding media diameter (mm)

SAG mill grates must withstand difficult conditions in order to maintain the desired throughput. But traditional steel grates aren't up to the challenge. They are typically cast from a material between 250 and 300 Brinell hardness – i.e. fairly soft, to avoid breakage – but the result is that they are easily deformed, causing grate slots ...

Semi-autogenous grinding mills (SAG mills) are tumbling mills that most commonly have a shell diameter-to-length ratio of around two. With this high aspect ratio, SAG mills generate both thrown and cascading ball-milling actions with shell linings shaped to lift and to throw alloy steel grinding balls of up to 150 mm (6 in.) in diameter. These

SAG Mill. Full case in PDF. ME Elecmetal's integral approach to mining is committed to add value into processes through fully-integrated ME FIT solutions. In this case, by testing new SAG mill liner designs in order to …

Bradken Bullnose®discharge cones Manufactured from superior composite wear materials to extend wear life of the liners and reduce the overall weight by 40% over steel products.Bullnose® discharge cone system reduces the relining times by 50% to maximise mill availability. Discharge grate slot analysis is carried out across all grate designs to …

Screen panel size is 28 by 54 inches. The oversize return tube turns with the trommel These things are not small. The diameter of the trommel for the 34-foot mill is 13.5 feet and the screen surface length is almost 13 feet. This gives us about 550 square feet of screen area, for roughly 30,000 tons a day or 1,300 tons an hour.

A Discrete Elements Method (DEM) study of load movement within a SAG mill 12,192 × 7620 (40′ × 25′) in normal operating conditions is performed. ... since the exit flow is restricted to only those particles of a size smaller than the grate's slot, a size that has been defined previously. It was decided to use 71.4% of the ore particles ...

The size distribution of the SAG mill feeds and plots is linked to the strength of the rock; a slope with a discharges during the five surveys are shown in Figures 10 steeper gradient indicates a weaker rock. ... It is grate slot size could not solely control the mill product size fact that the grate open area variable is out of the control of ...

Contribute to chengxinjia/sbm development by creating an account on GitHub.

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 …

Mineral movement simulation through the grates and pulp lifter in a SAG mill and evaluation for a new grate design using DEM

SAG Mill internal volume model: As the slot grate model, this model was developed using scanning measurements inside the mill. For this particular purpose it wasn't used the …

In South Africa wet grate discharge mills having a nominal ratio of length to diameter slightly larger than 1 (16/12 = 1. 33 and 14/12 = 1.17. In North America, with wet primary mills, the practice has been to use low or high level grate discharge or peripheral discharge and a nominal ratio of length to diameter relatively close to 1/3.

Grinding mills, including SAG (semi-autogenous grinding) mills and ball mills, consume approximately 60-70% of the total energy cost of the entire mining operation. The mills are installed with large motors, up to 20+MW, which impart the required energy to successfully process many tonnes per hour and grind the rock to a …

Grate slot size variation • SAG Mill internal model: As the slot grate model, this model was developed using volume scanning measurements inside the mill. For this particular purpose it wasn't ...

Finally, to estimate the dynamic filling level of full charge, Jc, three independent models were developed that allowed to feed the adjusted power model: • SAG mill discharge grate slot wear ...