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Example: a 26' ø × 11' EGL SAG mill with a 6" effective thickness polymet liner might draw 2,917 kW whereas as a 4.5" effective thickness steel liner might draw 2,991 kW. If you know the power draw and effective thickness of your current liners, use the ratio of (diam new / diam old)^2.5 to get a rough estimate the multiplier (for the same ...
SAG mill liner design and configuration can significantly impact mill performance. Key considerations for liner design include lifter spacing and angle, grate open area and aperture size, and pulp lifter design and …
Ideal for SAG mill (Diameter below 34 ft.) and Ball Mill (Diameter between 15ft and 18 ft.) DynaSteel® Composite Mill Liners. DynaSteel® is tailor-made for each mill in question, to provide a maximum protection against …
Figure 2: Cascading-impact action in a SAG mill. Rubber and composite mill lining systems. In the past, grinding mills were typically lined with cast metal linings of varying steel or iron alloys, and lining system selection was typically driven by level of wear protection and cost. As materials technology and design technique has advanced ...
for primary and secondary stage AG/SAG and ball mills stage grinding processes. Rubber liners made from Teknikum TRL17, TRL20 are best suited for secondary and tertiary stage grinding processes. TRL21 ... • Light weight vs. full steel liner • Liner can be equipped with lifting points for easy installation and handling . TECHNICAL PROPERTIES
large SAG mills Rubber or composite discharge systems reduce weight in metallic-lined mills Metallic grate plates combined with Poly-Met™ offer a balanced wear ... weight rubber parts or heavy-duty steel parts or combinations of both, depending on customer objectives. The latest innovations,
Tega Lining bolt attachment systems are compatible with conventional attachment for rubber lining used in grinding mill. The latter are available with steel as well, if requested because of very high or low pH- values ... Tega PM lining system is the preferred lining system for SAG, AG primary ball mills. Fastening System.
predicting mill trajectory > Optimise speeds, liner height, bar spacing, etc. > For large SAG mills the new liners can be 73% critical whilst worn liners require 80% critical
These mills use steel balls that go up to 6.5" in diameter and have a high risk of fracturing the internal linings of the mill. Potential impacts of the steel balls against the mill lining will be generated if the rotational speed of the mill is greater than that required for the ball to fall on the ore rock and fracture it.
Reducing energy consumption by reducing overall mill weight when using ... alloys into the steel mill liners, we tailor the mill liner solution to fit the specific customer application. And, with casting ... and are an effective wear solution in all SAG and ball mills. Feedheads Available in rubber-and-hot-rolled-steel composite and cast
Reduced liner costs per tonne of material processed. Longer lining life and fewer maintenance interruptions. Compared to metal liners, additional benefits realized: Faster …
• Cadia SAG mill data (Key drivers of wear life) – Ore composition – Volume / mass of steel – Hypothesis –'Liner shape defines the wear rate profile and the resulting life of liners' et al –Applying mill control to account for liner wear on the Cadia 40ft mill, SAG 2015
AG/SAG mill: One of the few remaining Hardinge 6' x 2' high aspect pilot 18 kW SAG mills in the world is fully operational at the ALS Metallurgy, Balcatta campus in Western Australia. Installed with a shell hatch to facilitate easy charge removal, the mill is installed on load cells connected to a SCADA system to collect mill weight, mill ...
The damage caused by ball strikes on the Alumbrera SAG mill's shell liner is depicted here – one can see the dimples on the surface of the liner caused by the steel ball strikes. Over the last few years, the use of hybrid liners (a composite of steel and rubber) in large diameter SAG Mills, for example 34' in diameter or larger, has ...
Less liner weight compared to steel Longer life of rotating parts. Liner is safer to handle and install Scheduled Tega liner monitoring program ... SAG MILLS UP TO 40FT PLUS IN DIAMETER INCREASED PRODUCTIVITY APPLICATION AREAS • SAG Mills • AG Mills • Primary Ball Mills
The steel dischargers on the SAG mill comprised 187 pieces. Not unsurprisingly, this led to lengthy downtimes for component replacement. Making the situation worse: the discharger service life was a relatively short 12 months. Inadequate liner service life. The SAG mill's steel liners were failing to meet the required service life.
The ore charge contained within the conical ends of course must also be considered in calculating the total charge weight. Figures 3a and b, and 4a and b show a typical print-out of mill cylinder and cone charge weight for an autogenous and semi-autogenous mill. The total charge weight is the sum of cylinder and conical charge …
rubber lining SAG mill first stage of grinding at a processing factory per year. Polymet Rubber Linings works 2-4 times longer than the steel Mg lining. Saving from up to $100 …
I know of a practice that uses 50 percent of the theoretical consumption calculated by the Bond formula for ball mills; for SAG Mills 65 percent of the theoretical consumption is used considering the SAG mill as a ball mill.The rotating paddle used in the Bond Ai test is made of SAE4325 steel hardened to 500 Brinell and therefore not ...
Figure 4 – The DEM calculated energy spectrum for 35mm rocks in a SAG mill (Powell & Weerasekara, 2010). SAG Mill operation . The Philsaga SAG mill is 6.1 m × 7.32 m with a 20 °conical angle (to vertical) of feed and discharge heads. This SAG mill is used to grind a feed nominally passing of 130 mm. It is driven by a 1400 kW motor coupled
temperature. Other aspects to be factored into the equation are liner weight, method of installation, and user preferences. SAG mill A SAG mill is almost always a high-impact application. Hence, it is wise to use tough, impact-resistant materials that are somewhat softer but less brittle to avoid cracking, chipping, or breaking. Rubber/steel ...
Mill Liner Design Multotec uses computer simulation to provide optimum liner configuration that extends liner life and increases Mill productivity. Client Data Mill Diameter 3 960 mm Mill Length 5 200 mm No. of Rows 26 Mill Filing 30% Media Diameter 50 mm Mill Data Charge Volume Calculations Mill Lining Inspections and Report After Sales Service
Dramatic shortcomings of mill liner designs, especially of large SAG mills, - such as rapid failure and even mill shell damage arising from impacting of the charge directly on the …
Dramatic shortcomings of mill liner designs, especially of large SAG mills, - such as rapid failure and ... They are light in weight and make use of the grinding media hardness to provide an effective wear material. They need to be manufactured in Manganese steel to wedge the steel balls, but the manganese steel spreads on impact and can make ...
SAG mills contain balls of up to 150mm in diameter that occupy 5%-18% of mill chamber volume. Ball mills, conversely, contain grinding media up to 50mm in diameter, occupying between 25% - 40% of mill chamber volume.
Outotec Poly-Met mill linings combine the most desirable properties of rubber and steel to maximum advantage. This combination allows the use of more wear resistant alloys of iron and steel than can be used in a conventional metallic lining, as the rubber substantially dampens the impact forces and also results in a lower lining weight. This
SAG mill liner development draws primarily on practical experience from SAG milling operations supported by computer-based modeling of charge motion in SAG mills and on established good design practice. Liner design needs to respond to the process aspects of mill liner action that are critical to good SAG mill performance, i.e., …
Unlike traditional mills that rely on steel balls or other media to break down materials, SAG mills use their own weight and the force of material being fed into them to grind ores. This makes them more energy-efficient than other types of machines. SAG mills are typically large cylinders made from steel with a rotating drum inside.
Figure 3 shows a typical semi-autogenous (SAG) circuit with feed coming directly from a primary crusher, and the semi-autogenous mill product going to the separation process. Many similar semiautogenous circuits are built today because they are simple and flexible, lend themselves readily to high tonnages and usually are lower in …
