The largest and most energy intensive consumer equipment is the SAG mill For stable operation of SAG mills in terms of tonnage tpd and energy consumption it is necessary to identify load level
Collahuasi copper mine is situated in northern Chile about 180kmsoutheast of the port of Iquique at an altitude of 4 000m each consisting of a SAG mill and a ball mill Secondary closed circuit grinding includes cyclone classifiers from which the overflow feeds the flotation circuit Flotation concentrate is thickened to 50% solids for
Now lets suppose you have a SAG Mill and Ball Mill that are not drawing full kW Power The SAG 911 Metallurgist is a trusted resource for practical insights solutions and support in mineral processing engineering helping industry professionals succeed with proven expertise SAG Mill Ball Size Evaluator Evaluation Factors Calculate
A data set of mill operating data is collected from published information and compared to predictions made by two published mill power draw models for SAG mills Austin s SAG model and Morrell s C model A third model Hogg and Fuerstenau is fit to each survey and the principal fitting parameter is tabulated Power measurement
The hidden footprint of embodied energy and CO 2 emissions of steel grinding media is an overlooked but rather obvious pathway to significant reduction in optional Scope 3 emissions in the
of the Collahuasi Grinding Circuit Alruiz a S Morrellb a Suazo A Naranjo a Compañia Minera Doña Ins de Collahuasi SCM b SMCC Pty Ltd Semi autogenous SAG and ball mills behave plus developments in ore characterisation techniques relevant to AG and SAG mills that can be obtained from small diameter drill core
or some other design point based on what is achievable to feed the SAG mill considering the mining method Mine design is an important part of SAG mill design 80 th Percentile Design Recommended design point for most new plants Typically the SAG mill will be 10 to 15% larger more power than an average ore design Other design points
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Ball mills and SAG mills vertica l grinding mills for raw or finishing sec tions all have a constant torq ue speed characteristic however the starting torques comminution process and material
Due to its strong lifting capacity and excellent grinding performance the trapezoidal liner is widely used in the SAG mill The structure of the trapezoidal liner is shown in Fig 1 the main dimensions are dip angle tau length of the top edge L and height h Dip angle tau determines the trajectory of the mediums in the SAG mill which directly affects
An experienced SAG mill operator or metallurgist can recognize the trends in operating conditions associated with various operating states that may impact SAG mill grinding performance
Collahuasi porphyry has a granodioritic composition and is between 50 to 300 m wide and up to 100 m long Masterman 2003 suggests that this porphyry is Permian with a U Pb age of 245 Ma ± 12 Ma Intruding the Collahuasi porphyry is the Rosario porphyry which is 300 to 500 m wide and up to 1 500 m long
Mine to Mill The feed size to AG and SAG mill circuits has been demonstrated to have a significant impact on throughput with effects such a that illustrated in Figure 7 being commonplace Modifying blast design and primary crusher operation can significantly influence AG/SAG mill feed size hence giving a potentially cost effective way to
the SAG mill and the key testwork data is given in Table 1 The total weight of the emptied out charge was tons making up a total mill slurry filling of 43 % and a ball load of 22 % The
During 2019 Collahuasi proposed that Metso lead the difficult and important work of upgrading its mills a task that prior to 2019 had been handled by other contracting companies Metso working with Collahuasi managed in 71 days to successfully complete the project without accidents and to carry out the final commissioning without setbacks
SAG Mill 1011 operation 40 x 22 feet the largest copper SAG mill of the world to a fully automatic SAG Mill using a multivariable control strategy instead of a rule based on expert
Minera Collahuasi Gratis Investigaciones 41 60 Gratuitos Documentos referente a Minera Collahuasi para en Enero de 1994 para prestar servicios de montaje de Molino Sag Universidad Austral de Chile Facultad de
The JKMRC has been studying and modelling industrial AG and SAG mills for over 40 years but the ability to simulate the effects of blending hard and soft components on mill performance remains
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 capital cost
RoM Ball mills like SAG mills utilise coarse rocks in the RoM feed as grinding media but with 25 40% steel balls added which is advantageous when the coarse fraction in the RoM feed is
In this paper the experience and results of the implementation of an advanced control strategy for SAG mills 1 and 2 at Codelco Chile s División El Teniente is presented
The 36′ SAG mill considered is a geometrically scaled up version of the m Hardinge pilot scale mill but with a longer belly length reflecting current SAG mill design preferences The belly
Figure 3 a —Pilot SAG mill Ecs vs Ball Load Reproduced from Morrell 2006a ; b SAG Mill Ecs vs Ball Load for Open Circuit SAG Mills in JKTech Database 0 2 4 6 8 10 12 14 16 18 20 0 2 4 6 8 10 12 14 SAG mill Ecs kWh/t Ball load % 0 5 10 15 20 SAG mill Ecs kWh/t Ball load % Coarse feed uncrushed pebbles Very soft ores Axb >80
