Slurry flow in mills: grate-only discharge mechanism (Part-1)
All autogenous (AG) and semi-autogenous (SAG) mills use steel or rubber grates to hold back the grinding media, whilst allowing the product slurry to flow through and out of the mill. The total open area, size, shape and position of the holes varies considerably from installation to installation (Napier-Munn et al., 1996), as given in Table 1.
Products
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 ...
Mineral movement simulation through the grates and …
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 …
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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 …
SAG MILL DISCHARGE SCREENS-TROMMEL vs. …
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.
Discharge End Liner System
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 …
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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, …
Autogenous Grinding & Semi Autogenous Grinding …
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.
Optimizing your SAG mill operation
Similar to slurry flow-back, the pebbles flowing back into the mill increase with larger pebble port or grate slot size. As the pebbles flow down and slide across …
Overflow VS Grate Discharge Ball or Mill
Grate Discharge Ball Mills have shown 25% to 45% more tonnage ground and a substantial reduction in power consumed per ton of material compared size for size with overflow mills. To illustrate the characteristics of various type mills we have shown the types of discharge for rod mills and ball mills. There are essentially four types of rod …
Simulation of Material Transport in a SAG Mill with
Felipe González & Paola Merino. 266 Accesses. 6 Citations. Explore all metrics. Abstract. A Discrete Elements Method (DEM) study of load movement within a …
Grate Slot Size Reduction
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 …
Vortex
The Bradken Vortex® Discharge System: Provides superior discharge performance for SAG and AG mills. Is ideally suited to high throughput, high solids discharge mills. Increases ore throughputs. Increases pulp lifter wear life. Our one-piece Super Vortex® Grates cover the full depth of the charge to maximize grate open area and mill …
Using DEM to model ore breakage within a pilot scale SAG mill
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.
Mineral movement simulation through the grates and …
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
sbm/sbm sag mill grates.md at main · chengxinjia/sbm
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Semi-autogenous grinding (SAG) mill liner design and …
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, …
SAG milling & grinding pilot plants
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).
Grate Slot Size Reduction
In this case, by testing new SAG mill liner designs in order to improve throughput, reduce pebble load and optimize reline times. Check out our case study for a client in the United States. Find out how our process and final results went with our client.
Development of a Dynamic Jb / Jc Estimation Model in 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 ...
Composite Discharge Grates | FLS
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 ...
Vortex
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 …
Inferential measurement of SAG mill parameters III
34. 34. The parameters that have the most influence on the uncertainty in the inferential SAG mill fresh feed size distribution measurement are the oversize crusher feedrate, OSCF tph_p, the pebble port diameter, xp, the primary cyclone feed density, PCFD % s w / w and the pebble port relative open area, fp.
Development of a dynamic Jb/Jc estimation …
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 ...
SAG Mill Ball Size Evaluator | Evaluation Factors …
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 …
NAFEMS
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.
Semi-autogenous grinding (SAG) mill liner design and …
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
Grate slot size variation | Download Scientific …
Download scientific diagram | Grate slot size variation from publication: Development of a dynamic Jb/Jc estimation model in a single stage SAG mill | The following article presents the...
SAG Mill Liner Design
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 …
Slurry pooling and transport issues in SAG mills
These are ideal for high throughputs and a coarse product to feed to a secondary ball mill for further size reduction. Medium aspect mills are common in Australia, with aspect ratios between 1.2 and 1.5. ... To obtain these rates the discharge grate slots are enlarged to all be pebble ports. ... as illustrated in Figure 3. SAG 1 SAG 2 ...