Autogenous grinding (AG) and semi-autogenous grinding (SAG) mills use the material to be ground as the grinding media. Autogenous grinding mills use larger rocks to impact and break smaller rocks as the mill rotates. Semi-autogenous mills are basically the same autogenous mills, but with the addition of balls, similar to those in ball mills.
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The SAGDesign test was developed by the SAGDesign Consulting Group (Starkey, Hindstrom & Nadasdy, 2006) and consists of a batch grinding test conducted in a 0.488m diameter SAG mill. About 10kg of drill core is required for testing. The feed is prepared to 80% passing 19mm and ground to 80% passing 1.7mm.
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The DEM and erosion model SIEM were used to predict wear within the SAG mill. The simulation results of the standard case (the rotation speed is 10.5 rpm; the angle of the lifter face is 14°; the lifter height is 152 mm) are quantitively validated against the corresponding experimental data [6], and the effects of the rotation speed and lifter ...
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size, expected impact force on the liner, chemical environment, and temperature. Other aspects to be factored into the equation are liner weight, method of installation, and user …
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Received February 21, 2020 Revised November 8, 2020 Accepted January 15, 2021. Abstract—The authors analyze the influence of the semi-autogenous (SAG) mill …
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size, expected impact force on the liner, chemical environment, and 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
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This method simulates the particles size, mill power, and qualified particles quality of crushed particle, which reveal the grinding strength and energy consumption of the SAG mill. In this paper, the grinding changes of a SAG mill under di erent parameter conditions are explored. Firstly, an experiment on the influence of a single parameter ...
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A SAG mill has the advantages of high operation rate, large output, and large crushing ratio, which makes SAG mills have the characteristics of short process time, low management cost, and suitability for large-scale production compared to other mills. ... and the material is broken by the impact force generated during the falling process ...
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For this work, the self-developed DEM code was used to simulate the particle motion of the milling process within the SAG mill. A standard case was performed based on the experiment, which is a wet grinding [6, 64].Fig. 1 shows the virtual image of the whole 3D SAG mill. The 9.75 × 4.88 m SAG mill rotates with a constant rotation speed of 10.5 …
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The SAG mill model was created using a discrete element simulation program based on experimental studies of material properties considering abrasive …
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Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. Fuller-Traylor SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW.
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The impact of the shape representation used for rock particles in a DEM model of a SAG mill on charge dynamics and energy utilisation is investigated. A 1.8-m diameter pilot scale SAG mill which includes realistic end walls and a discharge grate is used. This size of mill is used for scale-up and design processes for industrial SAG mills …
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2 AG mill + a recycle crusher Competent ore - relatively homogenous. The recycle crusher is used to balance the rate of media breakage within the mill Kambalda, Olympic Dam, Sino Iron 3 SAG mill (8 – 15% ball charge) Variable or moderate competency ore with the competency suiting the selected grind size Tarkwa, Leinster, Golden Pride,
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Each cycle includes two main calculation steps as follows: (1) The contact force and relative ... During the operation of a SAG mill, impact energy re ceived by the particles is often lower than the energy required for fracture, but repeated low-energy impact is sufficient to cause internal damage to
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widely used in the SAG mill. The structure of the trapezoidal liner is shown in Fig. 1, the main dimensions are: dip angle τ, length of the top edge L and height h. Dip angle τ determines the trajectory of the mediums in the SAG mill, which directly affects the impact speed and impact energy against the liner after the medium is thrown away.
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Cataracting or impact grinding is more pronounced in AG/SAG grinding mill, where the charge materials are elevated by the lifter to a height until the gravitational force of the charge reaches equilibrium, hence falling to the toe angle of the mill (Owen and Cleary, 2015). In such a process, the charge assumes a parabolic geometry or trajectory.
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8 For instance, the impact force generated by a 76-mm steel ball within a 2.74-m mill equals 2850 MPa. 9 The yield strength of the liner designed by CITIC Heavy Industries equals to 1000 MPa, and ...
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In recent years, the trend in large SAG mills has been to use wide-spaced shell lifters with large lifter face angles, primarily to reduce packing and ball/liner damage, and to use …
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High impacts from lifting ore and media promote impact breakage which is the primary mechanism for size reduction in the mill. Via the use of sophisticated instruments and …
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The contact force, which includes the normal contact force and the tangential contact force, can be calculated by the linear spring-dashpot model proposed by Cundall and Strack ... The ore filling level has a significant impact on the power of the SAG mill and the collision energy on ore particles. As the ore filling level increases, the use of ...
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Ball Mills have a higher degree of efficiency than SAG Mills due to their smaller size and have more area for grinding particles, leading to faster grinding. On the other hand, SAG Mills have a larger and deeper drum that provides larger lifting force which increases grinding efficiency. In addition, due to its larger size, SAG Mills consumes ...
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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 ...
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The SAG mill model was created using a discrete element simulation program based on experimental studies of material properties considering abrasive-impact wear. In this work, a complete research cycle, including experimental material investigation, numerical modeling and development of the final software application, was performed.
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The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged can reach 0.1 mm. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill's ...
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